View.java revision 1313b08011cfd4c89ab1101c0672f8dc8de2de23
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)} or {@link #setPaddingRelative(int, int, int, int)} 347 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 348 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 349 * {@link #getPaddingEnd()}. 350 * </p> 351 * 352 * <p> 353 * Even though a view can define a padding, it does not provide any support for 354 * margins. However, view groups provide such a support. Refer to 355 * {@link android.view.ViewGroup} and 356 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 357 * </p> 358 * 359 * <a name="Layout"></a> 360 * <h3>Layout</h3> 361 * <p> 362 * Layout is a two pass process: a measure pass and a layout pass. The measuring 363 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 364 * of the view tree. Each view pushes dimension specifications down the tree 365 * during the recursion. At the end of the measure pass, every view has stored 366 * its measurements. The second pass happens in 367 * {@link #layout(int,int,int,int)} and is also top-down. During 368 * this pass each parent is responsible for positioning all of its children 369 * using the sizes computed in the measure pass. 370 * </p> 371 * 372 * <p> 373 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 374 * {@link #getMeasuredHeight()} values must be set, along with those for all of 375 * that view's descendants. A view's measured width and measured height values 376 * must respect the constraints imposed by the view's parents. This guarantees 377 * that at the end of the measure pass, all parents accept all of their 378 * children's measurements. A parent view may call measure() more than once on 379 * its children. For example, the parent may measure each child once with 380 * unspecified dimensions to find out how big they want to be, then call 381 * measure() on them again with actual numbers if the sum of all the children's 382 * unconstrained sizes is too big or too small. 383 * </p> 384 * 385 * <p> 386 * The measure pass uses two classes to communicate dimensions. The 387 * {@link MeasureSpec} class is used by views to tell their parents how they 388 * want to be measured and positioned. The base LayoutParams class just 389 * describes how big the view wants to be for both width and height. For each 390 * dimension, it can specify one of: 391 * <ul> 392 * <li> an exact number 393 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 394 * (minus padding) 395 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 396 * enclose its content (plus padding). 397 * </ul> 398 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 399 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 400 * an X and Y value. 401 * </p> 402 * 403 * <p> 404 * MeasureSpecs are used to push requirements down the tree from parent to 405 * child. A MeasureSpec can be in one of three modes: 406 * <ul> 407 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 408 * of a child view. For example, a LinearLayout may call measure() on its child 409 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 410 * tall the child view wants to be given a width of 240 pixels. 411 * <li>EXACTLY: This is used by the parent to impose an exact size on the 412 * child. The child must use this size, and guarantee that all of its 413 * descendants will fit within this size. 414 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 415 * child. The child must gurantee that it and all of its descendants will fit 416 * within this size. 417 * </ul> 418 * </p> 419 * 420 * <p> 421 * To intiate a layout, call {@link #requestLayout}. This method is typically 422 * called by a view on itself when it believes that is can no longer fit within 423 * its current bounds. 424 * </p> 425 * 426 * <a name="Drawing"></a> 427 * <h3>Drawing</h3> 428 * <p> 429 * Drawing is handled by walking the tree and rendering each view that 430 * intersects the invalid region. Because the tree is traversed in-order, 431 * this means that parents will draw before (i.e., behind) their children, with 432 * siblings drawn in the order they appear in the tree. 433 * If you set a background drawable for a View, then the View will draw it for you 434 * before calling back to its <code>onDraw()</code> method. 435 * </p> 436 * 437 * <p> 438 * Note that the framework will not draw views that are not in the invalid region. 439 * </p> 440 * 441 * <p> 442 * To force a view to draw, call {@link #invalidate()}. 443 * </p> 444 * 445 * <a name="EventHandlingThreading"></a> 446 * <h3>Event Handling and Threading</h3> 447 * <p> 448 * The basic cycle of a view is as follows: 449 * <ol> 450 * <li>An event comes in and is dispatched to the appropriate view. The view 451 * handles the event and notifies any listeners.</li> 452 * <li>If in the course of processing the event, the view's bounds may need 453 * to be changed, the view will call {@link #requestLayout()}.</li> 454 * <li>Similarly, if in the course of processing the event the view's appearance 455 * may need to be changed, the view will call {@link #invalidate()}.</li> 456 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 457 * the framework will take care of measuring, laying out, and drawing the tree 458 * as appropriate.</li> 459 * </ol> 460 * </p> 461 * 462 * <p><em>Note: The entire view tree is single threaded. You must always be on 463 * the UI thread when calling any method on any view.</em> 464 * If you are doing work on other threads and want to update the state of a view 465 * from that thread, you should use a {@link Handler}. 466 * </p> 467 * 468 * <a name="FocusHandling"></a> 469 * <h3>Focus Handling</h3> 470 * <p> 471 * The framework will handle routine focus movement in response to user input. 472 * This includes changing the focus as views are removed or hidden, or as new 473 * views become available. Views indicate their willingness to take focus 474 * through the {@link #isFocusable} method. To change whether a view can take 475 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 476 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 477 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 478 * </p> 479 * <p> 480 * Focus movement is based on an algorithm which finds the nearest neighbor in a 481 * given direction. In rare cases, the default algorithm may not match the 482 * intended behavior of the developer. In these situations, you can provide 483 * explicit overrides by using these XML attributes in the layout file: 484 * <pre> 485 * nextFocusDown 486 * nextFocusLeft 487 * nextFocusRight 488 * nextFocusUp 489 * </pre> 490 * </p> 491 * 492 * 493 * <p> 494 * To get a particular view to take focus, call {@link #requestFocus()}. 495 * </p> 496 * 497 * <a name="TouchMode"></a> 498 * <h3>Touch Mode</h3> 499 * <p> 500 * When a user is navigating a user interface via directional keys such as a D-pad, it is 501 * necessary to give focus to actionable items such as buttons so the user can see 502 * what will take input. If the device has touch capabilities, however, and the user 503 * begins interacting with the interface by touching it, it is no longer necessary to 504 * always highlight, or give focus to, a particular view. This motivates a mode 505 * for interaction named 'touch mode'. 506 * </p> 507 * <p> 508 * For a touch capable device, once the user touches the screen, the device 509 * will enter touch mode. From this point onward, only views for which 510 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 511 * Other views that are touchable, like buttons, will not take focus when touched; they will 512 * only fire the on click listeners. 513 * </p> 514 * <p> 515 * Any time a user hits a directional key, such as a D-pad direction, the view device will 516 * exit touch mode, and find a view to take focus, so that the user may resume interacting 517 * with the user interface without touching the screen again. 518 * </p> 519 * <p> 520 * The touch mode state is maintained across {@link android.app.Activity}s. Call 521 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 522 * </p> 523 * 524 * <a name="Scrolling"></a> 525 * <h3>Scrolling</h3> 526 * <p> 527 * The framework provides basic support for views that wish to internally 528 * scroll their content. This includes keeping track of the X and Y scroll 529 * offset as well as mechanisms for drawing scrollbars. See 530 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 531 * {@link #awakenScrollBars()} for more details. 532 * </p> 533 * 534 * <a name="Tags"></a> 535 * <h3>Tags</h3> 536 * <p> 537 * Unlike IDs, tags are not used to identify views. Tags are essentially an 538 * extra piece of information that can be associated with a view. They are most 539 * often used as a convenience to store data related to views in the views 540 * themselves rather than by putting them in a separate structure. 541 * </p> 542 * 543 * <a name="Properties"></a> 544 * <h3>Properties</h3> 545 * <p> 546 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 547 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 548 * available both in the {@link Property} form as well as in similarly-named setter/getter 549 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 550 * be used to set persistent state associated with these rendering-related properties on the view. 551 * The properties and methods can also be used in conjunction with 552 * {@link android.animation.Animator Animator}-based animations, described more in the 553 * <a href="#Animation">Animation</a> section. 554 * </p> 555 * 556 * <a name="Animation"></a> 557 * <h3>Animation</h3> 558 * <p> 559 * Starting with Android 3.0, the preferred way of animating views is to use the 560 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 561 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 562 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 563 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 564 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 565 * makes animating these View properties particularly easy and efficient. 566 * </p> 567 * <p> 568 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 569 * You can attach an {@link Animation} object to a view using 570 * {@link #setAnimation(Animation)} or 571 * {@link #startAnimation(Animation)}. The animation can alter the scale, 572 * rotation, translation and alpha of a view over time. If the animation is 573 * attached to a view that has children, the animation will affect the entire 574 * subtree rooted by that node. When an animation is started, the framework will 575 * take care of redrawing the appropriate views until the animation completes. 576 * </p> 577 * 578 * <a name="Security"></a> 579 * <h3>Security</h3> 580 * <p> 581 * Sometimes it is essential that an application be able to verify that an action 582 * is being performed with the full knowledge and consent of the user, such as 583 * granting a permission request, making a purchase or clicking on an advertisement. 584 * Unfortunately, a malicious application could try to spoof the user into 585 * performing these actions, unaware, by concealing the intended purpose of the view. 586 * As a remedy, the framework offers a touch filtering mechanism that can be used to 587 * improve the security of views that provide access to sensitive functionality. 588 * </p><p> 589 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 590 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 591 * will discard touches that are received whenever the view's window is obscured by 592 * another visible window. As a result, the view will not receive touches whenever a 593 * toast, dialog or other window appears above the view's window. 594 * </p><p> 595 * For more fine-grained control over security, consider overriding the 596 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 597 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 598 * </p> 599 * 600 * @attr ref android.R.styleable#View_alpha 601 * @attr ref android.R.styleable#View_background 602 * @attr ref android.R.styleable#View_clickable 603 * @attr ref android.R.styleable#View_contentDescription 604 * @attr ref android.R.styleable#View_drawingCacheQuality 605 * @attr ref android.R.styleable#View_duplicateParentState 606 * @attr ref android.R.styleable#View_id 607 * @attr ref android.R.styleable#View_requiresFadingEdge 608 * @attr ref android.R.styleable#View_fadeScrollbars 609 * @attr ref android.R.styleable#View_fadingEdgeLength 610 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 611 * @attr ref android.R.styleable#View_fitsSystemWindows 612 * @attr ref android.R.styleable#View_isScrollContainer 613 * @attr ref android.R.styleable#View_focusable 614 * @attr ref android.R.styleable#View_focusableInTouchMode 615 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 616 * @attr ref android.R.styleable#View_keepScreenOn 617 * @attr ref android.R.styleable#View_layerType 618 * @attr ref android.R.styleable#View_longClickable 619 * @attr ref android.R.styleable#View_minHeight 620 * @attr ref android.R.styleable#View_minWidth 621 * @attr ref android.R.styleable#View_nextFocusDown 622 * @attr ref android.R.styleable#View_nextFocusLeft 623 * @attr ref android.R.styleable#View_nextFocusRight 624 * @attr ref android.R.styleable#View_nextFocusUp 625 * @attr ref android.R.styleable#View_onClick 626 * @attr ref android.R.styleable#View_padding 627 * @attr ref android.R.styleable#View_paddingBottom 628 * @attr ref android.R.styleable#View_paddingLeft 629 * @attr ref android.R.styleable#View_paddingRight 630 * @attr ref android.R.styleable#View_paddingTop 631 * @attr ref android.R.styleable#View_paddingStart 632 * @attr ref android.R.styleable#View_paddingEnd 633 * @attr ref android.R.styleable#View_saveEnabled 634 * @attr ref android.R.styleable#View_rotation 635 * @attr ref android.R.styleable#View_rotationX 636 * @attr ref android.R.styleable#View_rotationY 637 * @attr ref android.R.styleable#View_scaleX 638 * @attr ref android.R.styleable#View_scaleY 639 * @attr ref android.R.styleable#View_scrollX 640 * @attr ref android.R.styleable#View_scrollY 641 * @attr ref android.R.styleable#View_scrollbarSize 642 * @attr ref android.R.styleable#View_scrollbarStyle 643 * @attr ref android.R.styleable#View_scrollbars 644 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 645 * @attr ref android.R.styleable#View_scrollbarFadeDuration 646 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 647 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 648 * @attr ref android.R.styleable#View_scrollbarThumbVertical 649 * @attr ref android.R.styleable#View_scrollbarTrackVertical 650 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 651 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 652 * @attr ref android.R.styleable#View_soundEffectsEnabled 653 * @attr ref android.R.styleable#View_tag 654 * @attr ref android.R.styleable#View_textAlignment 655 * @attr ref android.R.styleable#View_transformPivotX 656 * @attr ref android.R.styleable#View_transformPivotY 657 * @attr ref android.R.styleable#View_translationX 658 * @attr ref android.R.styleable#View_translationY 659 * @attr ref android.R.styleable#View_visibility 660 * 661 * @see android.view.ViewGroup 662 */ 663public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 664 AccessibilityEventSource { 665 private static final boolean DBG = false; 666 667 /** 668 * The logging tag used by this class with android.util.Log. 669 */ 670 protected static final String VIEW_LOG_TAG = "View"; 671 672 /** 673 * When set to true, apps will draw debugging information about their layouts. 674 * 675 * @hide 676 */ 677 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 678 679 /** 680 * Used to mark a View that has no ID. 681 */ 682 public static final int NO_ID = -1; 683 684 /** 685 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 686 * calling setFlags. 687 */ 688 private static final int NOT_FOCUSABLE = 0x00000000; 689 690 /** 691 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 692 * setFlags. 693 */ 694 private static final int FOCUSABLE = 0x00000001; 695 696 /** 697 * Mask for use with setFlags indicating bits used for focus. 698 */ 699 private static final int FOCUSABLE_MASK = 0x00000001; 700 701 /** 702 * This view will adjust its padding to fit sytem windows (e.g. status bar) 703 */ 704 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 705 706 /** 707 * This view is visible. 708 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 709 * android:visibility}. 710 */ 711 public static final int VISIBLE = 0x00000000; 712 713 /** 714 * This view is invisible, but it still takes up space for layout purposes. 715 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 716 * android:visibility}. 717 */ 718 public static final int INVISIBLE = 0x00000004; 719 720 /** 721 * This view is invisible, and it doesn't take any space for layout 722 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 723 * android:visibility}. 724 */ 725 public static final int GONE = 0x00000008; 726 727 /** 728 * Mask for use with setFlags indicating bits used for visibility. 729 * {@hide} 730 */ 731 static final int VISIBILITY_MASK = 0x0000000C; 732 733 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 734 735 /** 736 * This view is enabled. Interpretation varies by subclass. 737 * Use with ENABLED_MASK when calling setFlags. 738 * {@hide} 739 */ 740 static final int ENABLED = 0x00000000; 741 742 /** 743 * This view is disabled. Interpretation varies by subclass. 744 * Use with ENABLED_MASK when calling setFlags. 745 * {@hide} 746 */ 747 static final int DISABLED = 0x00000020; 748 749 /** 750 * Mask for use with setFlags indicating bits used for indicating whether 751 * this view is enabled 752 * {@hide} 753 */ 754 static final int ENABLED_MASK = 0x00000020; 755 756 /** 757 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 758 * called and further optimizations will be performed. It is okay to have 759 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 760 * {@hide} 761 */ 762 static final int WILL_NOT_DRAW = 0x00000080; 763 764 /** 765 * Mask for use with setFlags indicating bits used for indicating whether 766 * this view is will draw 767 * {@hide} 768 */ 769 static final int DRAW_MASK = 0x00000080; 770 771 /** 772 * <p>This view doesn't show scrollbars.</p> 773 * {@hide} 774 */ 775 static final int SCROLLBARS_NONE = 0x00000000; 776 777 /** 778 * <p>This view shows horizontal scrollbars.</p> 779 * {@hide} 780 */ 781 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 782 783 /** 784 * <p>This view shows vertical scrollbars.</p> 785 * {@hide} 786 */ 787 static final int SCROLLBARS_VERTICAL = 0x00000200; 788 789 /** 790 * <p>Mask for use with setFlags indicating bits used for indicating which 791 * scrollbars are enabled.</p> 792 * {@hide} 793 */ 794 static final int SCROLLBARS_MASK = 0x00000300; 795 796 /** 797 * Indicates that the view should filter touches when its window is obscured. 798 * Refer to the class comments for more information about this security feature. 799 * {@hide} 800 */ 801 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 802 803 /** 804 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 805 * that they are optional and should be skipped if the window has 806 * requested system UI flags that ignore those insets for layout. 807 */ 808 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 809 810 /** 811 * <p>This view doesn't show fading edges.</p> 812 * {@hide} 813 */ 814 static final int FADING_EDGE_NONE = 0x00000000; 815 816 /** 817 * <p>This view shows horizontal fading edges.</p> 818 * {@hide} 819 */ 820 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 821 822 /** 823 * <p>This view shows vertical fading edges.</p> 824 * {@hide} 825 */ 826 static final int FADING_EDGE_VERTICAL = 0x00002000; 827 828 /** 829 * <p>Mask for use with setFlags indicating bits used for indicating which 830 * fading edges are enabled.</p> 831 * {@hide} 832 */ 833 static final int FADING_EDGE_MASK = 0x00003000; 834 835 /** 836 * <p>Indicates this view can be clicked. When clickable, a View reacts 837 * to clicks by notifying the OnClickListener.<p> 838 * {@hide} 839 */ 840 static final int CLICKABLE = 0x00004000; 841 842 /** 843 * <p>Indicates this view is caching its drawing into a bitmap.</p> 844 * {@hide} 845 */ 846 static final int DRAWING_CACHE_ENABLED = 0x00008000; 847 848 /** 849 * <p>Indicates that no icicle should be saved for this view.<p> 850 * {@hide} 851 */ 852 static final int SAVE_DISABLED = 0x000010000; 853 854 /** 855 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 856 * property.</p> 857 * {@hide} 858 */ 859 static final int SAVE_DISABLED_MASK = 0x000010000; 860 861 /** 862 * <p>Indicates that no drawing cache should ever be created for this view.<p> 863 * {@hide} 864 */ 865 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 866 867 /** 868 * <p>Indicates this view can take / keep focus when int touch mode.</p> 869 * {@hide} 870 */ 871 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 872 873 /** 874 * <p>Enables low quality mode for the drawing cache.</p> 875 */ 876 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 877 878 /** 879 * <p>Enables high quality mode for the drawing cache.</p> 880 */ 881 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 882 883 /** 884 * <p>Enables automatic quality mode for the drawing cache.</p> 885 */ 886 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 887 888 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 889 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 890 }; 891 892 /** 893 * <p>Mask for use with setFlags indicating bits used for the cache 894 * quality property.</p> 895 * {@hide} 896 */ 897 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 898 899 /** 900 * <p> 901 * Indicates this view can be long clicked. When long clickable, a View 902 * reacts to long clicks by notifying the OnLongClickListener or showing a 903 * context menu. 904 * </p> 905 * {@hide} 906 */ 907 static final int LONG_CLICKABLE = 0x00200000; 908 909 /** 910 * <p>Indicates that this view gets its drawable states from its direct parent 911 * and ignores its original internal states.</p> 912 * 913 * @hide 914 */ 915 static final int DUPLICATE_PARENT_STATE = 0x00400000; 916 917 /** 918 * The scrollbar style to display the scrollbars inside the content area, 919 * without increasing the padding. The scrollbars will be overlaid with 920 * translucency on the view's content. 921 */ 922 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 923 924 /** 925 * The scrollbar style to display the scrollbars inside the padded area, 926 * increasing the padding of the view. The scrollbars will not overlap the 927 * content area of the view. 928 */ 929 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 930 931 /** 932 * The scrollbar style to display the scrollbars at the edge of the view, 933 * without increasing the padding. The scrollbars will be overlaid with 934 * translucency. 935 */ 936 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 937 938 /** 939 * The scrollbar style to display the scrollbars at the edge of the view, 940 * increasing the padding of the view. The scrollbars will only overlap the 941 * background, if any. 942 */ 943 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 944 945 /** 946 * Mask to check if the scrollbar style is overlay or inset. 947 * {@hide} 948 */ 949 static final int SCROLLBARS_INSET_MASK = 0x01000000; 950 951 /** 952 * Mask to check if the scrollbar style is inside or outside. 953 * {@hide} 954 */ 955 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 956 957 /** 958 * Mask for scrollbar style. 959 * {@hide} 960 */ 961 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 962 963 /** 964 * View flag indicating that the screen should remain on while the 965 * window containing this view is visible to the user. This effectively 966 * takes care of automatically setting the WindowManager's 967 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 968 */ 969 public static final int KEEP_SCREEN_ON = 0x04000000; 970 971 /** 972 * View flag indicating whether this view should have sound effects enabled 973 * for events such as clicking and touching. 974 */ 975 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 976 977 /** 978 * View flag indicating whether this view should have haptic feedback 979 * enabled for events such as long presses. 980 */ 981 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 982 983 /** 984 * <p>Indicates that the view hierarchy should stop saving state when 985 * it reaches this view. If state saving is initiated immediately at 986 * the view, it will be allowed. 987 * {@hide} 988 */ 989 static final int PARENT_SAVE_DISABLED = 0x20000000; 990 991 /** 992 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 993 * {@hide} 994 */ 995 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 996 997 /** 998 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 999 * should add all focusable Views regardless if they are focusable in touch mode. 1000 */ 1001 public static final int FOCUSABLES_ALL = 0x00000000; 1002 1003 /** 1004 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1005 * should add only Views focusable in touch mode. 1006 */ 1007 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add only accessibility focusable Views. 1012 * 1013 * @hide 1014 */ 1015 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1016 1017 /** 1018 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1019 * item. 1020 */ 1021 public static final int FOCUS_BACKWARD = 0x00000001; 1022 1023 /** 1024 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1025 * item. 1026 */ 1027 public static final int FOCUS_FORWARD = 0x00000002; 1028 1029 /** 1030 * Use with {@link #focusSearch(int)}. Move focus to the left. 1031 */ 1032 public static final int FOCUS_LEFT = 0x00000011; 1033 1034 /** 1035 * Use with {@link #focusSearch(int)}. Move focus up. 1036 */ 1037 public static final int FOCUS_UP = 0x00000021; 1038 1039 /** 1040 * Use with {@link #focusSearch(int)}. Move focus to the right. 1041 */ 1042 public static final int FOCUS_RIGHT = 0x00000042; 1043 1044 /** 1045 * Use with {@link #focusSearch(int)}. Move focus down. 1046 */ 1047 public static final int FOCUS_DOWN = 0x00000082; 1048 1049 // Accessibility focus directions. 1050 1051 /** 1052 * The accessibility focus which is the current user position when 1053 * interacting with the accessibility framework. 1054 */ 1055 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1056 1057 /** 1058 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1059 */ 1060 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1061 1062 /** 1063 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1064 */ 1065 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1066 1067 /** 1068 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1069 */ 1070 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1071 1072 /** 1073 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1074 */ 1075 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1076 1077 /** 1078 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1079 */ 1080 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1081 1082 /** 1083 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1084 */ 1085 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1086 1087 /** 1088 * Bits of {@link #getMeasuredWidthAndState()} and 1089 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1090 */ 1091 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1092 1093 /** 1094 * Bits of {@link #getMeasuredWidthAndState()} and 1095 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1096 */ 1097 public static final int MEASURED_STATE_MASK = 0xff000000; 1098 1099 /** 1100 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1101 * for functions that combine both width and height into a single int, 1102 * such as {@link #getMeasuredState()} and the childState argument of 1103 * {@link #resolveSizeAndState(int, int, int)}. 1104 */ 1105 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1106 1107 /** 1108 * Bit of {@link #getMeasuredWidthAndState()} and 1109 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1110 * is smaller that the space the view would like to have. 1111 */ 1112 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1113 1114 /** 1115 * Base View state sets 1116 */ 1117 // Singles 1118 /** 1119 * Indicates the view has no states set. States are used with 1120 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1121 * view depending on its state. 1122 * 1123 * @see android.graphics.drawable.Drawable 1124 * @see #getDrawableState() 1125 */ 1126 protected static final int[] EMPTY_STATE_SET; 1127 /** 1128 * Indicates the view is enabled. States are used with 1129 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1130 * view depending on its state. 1131 * 1132 * @see android.graphics.drawable.Drawable 1133 * @see #getDrawableState() 1134 */ 1135 protected static final int[] ENABLED_STATE_SET; 1136 /** 1137 * Indicates the view is focused. States are used with 1138 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1139 * view depending on its state. 1140 * 1141 * @see android.graphics.drawable.Drawable 1142 * @see #getDrawableState() 1143 */ 1144 protected static final int[] FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is selected. States are used with 1147 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1148 * view depending on its state. 1149 * 1150 * @see android.graphics.drawable.Drawable 1151 * @see #getDrawableState() 1152 */ 1153 protected static final int[] SELECTED_STATE_SET; 1154 /** 1155 * Indicates the view is pressed. States are used with 1156 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1157 * view depending on its state. 1158 * 1159 * @see android.graphics.drawable.Drawable 1160 * @see #getDrawableState() 1161 * @hide 1162 */ 1163 protected static final int[] PRESSED_STATE_SET; 1164 /** 1165 * Indicates the view's window has focus. States are used with 1166 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1167 * view depending on its state. 1168 * 1169 * @see android.graphics.drawable.Drawable 1170 * @see #getDrawableState() 1171 */ 1172 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1173 // Doubles 1174 /** 1175 * Indicates the view is enabled and has the focus. 1176 * 1177 * @see #ENABLED_STATE_SET 1178 * @see #FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1181 /** 1182 * Indicates the view is enabled and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #SELECTED_STATE_SET 1186 */ 1187 protected static final int[] ENABLED_SELECTED_STATE_SET; 1188 /** 1189 * Indicates the view is enabled and that its window has focus. 1190 * 1191 * @see #ENABLED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1195 /** 1196 * Indicates the view is focused and selected. 1197 * 1198 * @see #FOCUSED_STATE_SET 1199 * @see #SELECTED_STATE_SET 1200 */ 1201 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1202 /** 1203 * Indicates the view has the focus and that its window has the focus. 1204 * 1205 * @see #FOCUSED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1209 /** 1210 * Indicates the view is selected and that its window has the focus. 1211 * 1212 * @see #SELECTED_STATE_SET 1213 * @see #WINDOW_FOCUSED_STATE_SET 1214 */ 1215 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1216 // Triples 1217 /** 1218 * Indicates the view is enabled, focused and selected. 1219 * 1220 * @see #ENABLED_STATE_SET 1221 * @see #FOCUSED_STATE_SET 1222 * @see #SELECTED_STATE_SET 1223 */ 1224 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1225 /** 1226 * Indicates the view is enabled, focused and its window has the focus. 1227 * 1228 * @see #ENABLED_STATE_SET 1229 * @see #FOCUSED_STATE_SET 1230 * @see #WINDOW_FOCUSED_STATE_SET 1231 */ 1232 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1233 /** 1234 * Indicates the view is enabled, selected and its window has the focus. 1235 * 1236 * @see #ENABLED_STATE_SET 1237 * @see #SELECTED_STATE_SET 1238 * @see #WINDOW_FOCUSED_STATE_SET 1239 */ 1240 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1241 /** 1242 * Indicates the view is focused, selected and its window has the focus. 1243 * 1244 * @see #FOCUSED_STATE_SET 1245 * @see #SELECTED_STATE_SET 1246 * @see #WINDOW_FOCUSED_STATE_SET 1247 */ 1248 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1249 /** 1250 * Indicates the view is enabled, focused, selected and its window 1251 * has the focus. 1252 * 1253 * @see #ENABLED_STATE_SET 1254 * @see #FOCUSED_STATE_SET 1255 * @see #SELECTED_STATE_SET 1256 * @see #WINDOW_FOCUSED_STATE_SET 1257 */ 1258 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1259 /** 1260 * Indicates the view is pressed and its window has the focus. 1261 * 1262 * @see #PRESSED_STATE_SET 1263 * @see #WINDOW_FOCUSED_STATE_SET 1264 */ 1265 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1266 /** 1267 * Indicates the view is pressed and selected. 1268 * 1269 * @see #PRESSED_STATE_SET 1270 * @see #SELECTED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_SELECTED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, selected and its window has the focus. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #SELECTED_STATE_SET 1278 * @see #WINDOW_FOCUSED_STATE_SET 1279 */ 1280 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1281 /** 1282 * Indicates the view is pressed and focused. 1283 * 1284 * @see #PRESSED_STATE_SET 1285 * @see #FOCUSED_STATE_SET 1286 */ 1287 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1288 /** 1289 * Indicates the view is pressed, focused and its window has the focus. 1290 * 1291 * @see #PRESSED_STATE_SET 1292 * @see #FOCUSED_STATE_SET 1293 * @see #WINDOW_FOCUSED_STATE_SET 1294 */ 1295 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1296 /** 1297 * Indicates the view is pressed, focused and selected. 1298 * 1299 * @see #PRESSED_STATE_SET 1300 * @see #SELECTED_STATE_SET 1301 * @see #FOCUSED_STATE_SET 1302 */ 1303 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1304 /** 1305 * Indicates the view is pressed, focused, selected and its window has the focus. 1306 * 1307 * @see #PRESSED_STATE_SET 1308 * @see #FOCUSED_STATE_SET 1309 * @see #SELECTED_STATE_SET 1310 * @see #WINDOW_FOCUSED_STATE_SET 1311 */ 1312 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1313 /** 1314 * Indicates the view is pressed and enabled. 1315 * 1316 * @see #PRESSED_STATE_SET 1317 * @see #ENABLED_STATE_SET 1318 */ 1319 protected static final int[] PRESSED_ENABLED_STATE_SET; 1320 /** 1321 * Indicates the view is pressed, enabled and its window has the focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 */ 1335 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1336 /** 1337 * Indicates the view is pressed, enabled, selected and its window has the 1338 * focus. 1339 * 1340 * @see #PRESSED_STATE_SET 1341 * @see #ENABLED_STATE_SET 1342 * @see #SELECTED_STATE_SET 1343 * @see #WINDOW_FOCUSED_STATE_SET 1344 */ 1345 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1346 /** 1347 * Indicates the view is pressed, enabled and focused. 1348 * 1349 * @see #PRESSED_STATE_SET 1350 * @see #ENABLED_STATE_SET 1351 * @see #FOCUSED_STATE_SET 1352 */ 1353 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1354 /** 1355 * Indicates the view is pressed, enabled, focused and its window has the 1356 * focus. 1357 * 1358 * @see #PRESSED_STATE_SET 1359 * @see #ENABLED_STATE_SET 1360 * @see #FOCUSED_STATE_SET 1361 * @see #WINDOW_FOCUSED_STATE_SET 1362 */ 1363 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1364 /** 1365 * Indicates the view is pressed, enabled, focused and selected. 1366 * 1367 * @see #PRESSED_STATE_SET 1368 * @see #ENABLED_STATE_SET 1369 * @see #SELECTED_STATE_SET 1370 * @see #FOCUSED_STATE_SET 1371 */ 1372 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1373 /** 1374 * Indicates the view is pressed, enabled, focused, selected and its window 1375 * has the focus. 1376 * 1377 * @see #PRESSED_STATE_SET 1378 * @see #ENABLED_STATE_SET 1379 * @see #SELECTED_STATE_SET 1380 * @see #FOCUSED_STATE_SET 1381 * @see #WINDOW_FOCUSED_STATE_SET 1382 */ 1383 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1384 1385 /** 1386 * The order here is very important to {@link #getDrawableState()} 1387 */ 1388 private static final int[][] VIEW_STATE_SETS; 1389 1390 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1391 static final int VIEW_STATE_SELECTED = 1 << 1; 1392 static final int VIEW_STATE_FOCUSED = 1 << 2; 1393 static final int VIEW_STATE_ENABLED = 1 << 3; 1394 static final int VIEW_STATE_PRESSED = 1 << 4; 1395 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1396 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1397 static final int VIEW_STATE_HOVERED = 1 << 7; 1398 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1399 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1400 1401 static final int[] VIEW_STATE_IDS = new int[] { 1402 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1403 R.attr.state_selected, VIEW_STATE_SELECTED, 1404 R.attr.state_focused, VIEW_STATE_FOCUSED, 1405 R.attr.state_enabled, VIEW_STATE_ENABLED, 1406 R.attr.state_pressed, VIEW_STATE_PRESSED, 1407 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1408 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1409 R.attr.state_hovered, VIEW_STATE_HOVERED, 1410 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1411 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1412 }; 1413 1414 static { 1415 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1416 throw new IllegalStateException( 1417 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1418 } 1419 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1420 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1421 int viewState = R.styleable.ViewDrawableStates[i]; 1422 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1423 if (VIEW_STATE_IDS[j] == viewState) { 1424 orderedIds[i * 2] = viewState; 1425 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1426 } 1427 } 1428 } 1429 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1430 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1431 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1432 int numBits = Integer.bitCount(i); 1433 int[] set = new int[numBits]; 1434 int pos = 0; 1435 for (int j = 0; j < orderedIds.length; j += 2) { 1436 if ((i & orderedIds[j+1]) != 0) { 1437 set[pos++] = orderedIds[j]; 1438 } 1439 } 1440 VIEW_STATE_SETS[i] = set; 1441 } 1442 1443 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1444 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1445 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1446 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1448 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1449 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1451 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1453 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1455 | VIEW_STATE_FOCUSED]; 1456 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1457 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1459 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1461 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1463 | VIEW_STATE_ENABLED]; 1464 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1466 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_ENABLED]; 1469 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1471 | VIEW_STATE_ENABLED]; 1472 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1474 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1475 1476 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1477 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1479 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1481 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1482 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1483 | VIEW_STATE_PRESSED]; 1484 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1485 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1486 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1487 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1488 | VIEW_STATE_PRESSED]; 1489 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1490 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1491 | VIEW_STATE_PRESSED]; 1492 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1493 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1494 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1495 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1496 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1497 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1498 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1499 | VIEW_STATE_PRESSED]; 1500 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1501 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1502 | VIEW_STATE_PRESSED]; 1503 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1504 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1505 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1506 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1507 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1508 | VIEW_STATE_PRESSED]; 1509 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1510 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1511 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1512 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1513 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1514 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1515 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1516 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1517 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1518 | VIEW_STATE_PRESSED]; 1519 } 1520 1521 /** 1522 * Accessibility event types that are dispatched for text population. 1523 */ 1524 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1525 AccessibilityEvent.TYPE_VIEW_CLICKED 1526 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1527 | AccessibilityEvent.TYPE_VIEW_SELECTED 1528 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1529 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1531 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1532 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1533 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1534 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1535 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1536 1537 /** 1538 * Temporary Rect currently for use in setBackground(). This will probably 1539 * be extended in the future to hold our own class with more than just 1540 * a Rect. :) 1541 */ 1542 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1543 1544 /** 1545 * Map used to store views' tags. 1546 */ 1547 private SparseArray<Object> mKeyedTags; 1548 1549 /** 1550 * The next available accessiiblity id. 1551 */ 1552 private static int sNextAccessibilityViewId; 1553 1554 /** 1555 * The animation currently associated with this view. 1556 * @hide 1557 */ 1558 protected Animation mCurrentAnimation = null; 1559 1560 /** 1561 * Width as measured during measure pass. 1562 * {@hide} 1563 */ 1564 @ViewDebug.ExportedProperty(category = "measurement") 1565 int mMeasuredWidth; 1566 1567 /** 1568 * Height as measured during measure pass. 1569 * {@hide} 1570 */ 1571 @ViewDebug.ExportedProperty(category = "measurement") 1572 int mMeasuredHeight; 1573 1574 /** 1575 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1576 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1577 * its display list. This flag, used only when hw accelerated, allows us to clear the 1578 * flag while retaining this information until it's needed (at getDisplayList() time and 1579 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1580 * 1581 * {@hide} 1582 */ 1583 boolean mRecreateDisplayList = false; 1584 1585 /** 1586 * The view's identifier. 1587 * {@hide} 1588 * 1589 * @see #setId(int) 1590 * @see #getId() 1591 */ 1592 @ViewDebug.ExportedProperty(resolveId = true) 1593 int mID = NO_ID; 1594 1595 /** 1596 * The stable ID of this view for accessibility purposes. 1597 */ 1598 int mAccessibilityViewId = NO_ID; 1599 1600 /** 1601 * @hide 1602 */ 1603 private int mAccessibilityCursorPosition = -1; 1604 1605 /** 1606 * The view's tag. 1607 * {@hide} 1608 * 1609 * @see #setTag(Object) 1610 * @see #getTag() 1611 */ 1612 protected Object mTag; 1613 1614 // for mPrivateFlags: 1615 /** {@hide} */ 1616 static final int WANTS_FOCUS = 0x00000001; 1617 /** {@hide} */ 1618 static final int FOCUSED = 0x00000002; 1619 /** {@hide} */ 1620 static final int SELECTED = 0x00000004; 1621 /** {@hide} */ 1622 static final int IS_ROOT_NAMESPACE = 0x00000008; 1623 /** {@hide} */ 1624 static final int HAS_BOUNDS = 0x00000010; 1625 /** {@hide} */ 1626 static final int DRAWN = 0x00000020; 1627 /** 1628 * When this flag is set, this view is running an animation on behalf of its 1629 * children and should therefore not cancel invalidate requests, even if they 1630 * lie outside of this view's bounds. 1631 * 1632 * {@hide} 1633 */ 1634 static final int DRAW_ANIMATION = 0x00000040; 1635 /** {@hide} */ 1636 static final int SKIP_DRAW = 0x00000080; 1637 /** {@hide} */ 1638 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1639 /** {@hide} */ 1640 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1641 /** {@hide} */ 1642 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1643 /** {@hide} */ 1644 static final int MEASURED_DIMENSION_SET = 0x00000800; 1645 /** {@hide} */ 1646 static final int FORCE_LAYOUT = 0x00001000; 1647 /** {@hide} */ 1648 static final int LAYOUT_REQUIRED = 0x00002000; 1649 1650 private static final int PRESSED = 0x00004000; 1651 1652 /** {@hide} */ 1653 static final int DRAWING_CACHE_VALID = 0x00008000; 1654 /** 1655 * Flag used to indicate that this view should be drawn once more (and only once 1656 * more) after its animation has completed. 1657 * {@hide} 1658 */ 1659 static final int ANIMATION_STARTED = 0x00010000; 1660 1661 private static final int SAVE_STATE_CALLED = 0x00020000; 1662 1663 /** 1664 * Indicates that the View returned true when onSetAlpha() was called and that 1665 * the alpha must be restored. 1666 * {@hide} 1667 */ 1668 static final int ALPHA_SET = 0x00040000; 1669 1670 /** 1671 * Set by {@link #setScrollContainer(boolean)}. 1672 */ 1673 static final int SCROLL_CONTAINER = 0x00080000; 1674 1675 /** 1676 * Set by {@link #setScrollContainer(boolean)}. 1677 */ 1678 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1679 1680 /** 1681 * View flag indicating whether this view was invalidated (fully or partially.) 1682 * 1683 * @hide 1684 */ 1685 static final int DIRTY = 0x00200000; 1686 1687 /** 1688 * View flag indicating whether this view was invalidated by an opaque 1689 * invalidate request. 1690 * 1691 * @hide 1692 */ 1693 static final int DIRTY_OPAQUE = 0x00400000; 1694 1695 /** 1696 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1697 * 1698 * @hide 1699 */ 1700 static final int DIRTY_MASK = 0x00600000; 1701 1702 /** 1703 * Indicates whether the background is opaque. 1704 * 1705 * @hide 1706 */ 1707 static final int OPAQUE_BACKGROUND = 0x00800000; 1708 1709 /** 1710 * Indicates whether the scrollbars are opaque. 1711 * 1712 * @hide 1713 */ 1714 static final int OPAQUE_SCROLLBARS = 0x01000000; 1715 1716 /** 1717 * Indicates whether the view is opaque. 1718 * 1719 * @hide 1720 */ 1721 static final int OPAQUE_MASK = 0x01800000; 1722 1723 /** 1724 * Indicates a prepressed state; 1725 * the short time between ACTION_DOWN and recognizing 1726 * a 'real' press. Prepressed is used to recognize quick taps 1727 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1728 * 1729 * @hide 1730 */ 1731 private static final int PREPRESSED = 0x02000000; 1732 1733 /** 1734 * Indicates whether the view is temporarily detached. 1735 * 1736 * @hide 1737 */ 1738 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1739 1740 /** 1741 * Indicates that we should awaken scroll bars once attached 1742 * 1743 * @hide 1744 */ 1745 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1746 1747 /** 1748 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1749 * @hide 1750 */ 1751 private static final int HOVERED = 0x10000000; 1752 1753 /** 1754 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1755 * for transform operations 1756 * 1757 * @hide 1758 */ 1759 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1760 1761 /** {@hide} */ 1762 static final int ACTIVATED = 0x40000000; 1763 1764 /** 1765 * Indicates that this view was specifically invalidated, not just dirtied because some 1766 * child view was invalidated. The flag is used to determine when we need to recreate 1767 * a view's display list (as opposed to just returning a reference to its existing 1768 * display list). 1769 * 1770 * @hide 1771 */ 1772 static final int INVALIDATED = 0x80000000; 1773 1774 /* Masks for mPrivateFlags2 */ 1775 1776 /** 1777 * Indicates that this view has reported that it can accept the current drag's content. 1778 * Cleared when the drag operation concludes. 1779 * @hide 1780 */ 1781 static final int DRAG_CAN_ACCEPT = 0x00000001; 1782 1783 /** 1784 * Indicates that this view is currently directly under the drag location in a 1785 * drag-and-drop operation involving content that it can accept. Cleared when 1786 * the drag exits the view, or when the drag operation concludes. 1787 * @hide 1788 */ 1789 static final int DRAG_HOVERED = 0x00000002; 1790 1791 /** 1792 * Horizontal layout direction of this view is from Left to Right. 1793 * Use with {@link #setLayoutDirection}. 1794 */ 1795 public static final int LAYOUT_DIRECTION_LTR = 0; 1796 1797 /** 1798 * Horizontal layout direction of this view is from Right to Left. 1799 * Use with {@link #setLayoutDirection}. 1800 */ 1801 public static final int LAYOUT_DIRECTION_RTL = 1; 1802 1803 /** 1804 * Horizontal layout direction of this view is inherited from its parent. 1805 * Use with {@link #setLayoutDirection}. 1806 */ 1807 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1808 1809 /** 1810 * Horizontal layout direction of this view is from deduced from the default language 1811 * script for the locale. Use with {@link #setLayoutDirection}. 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 */ 1877 public static final int TEXT_DIRECTION_INHERIT = 0; 1878 1879 /** 1880 * Text direction is using "first strong algorithm". The first strong directional character 1881 * determines the paragraph direction. If there is no strong directional character, the 1882 * paragraph direction is the view's resolved layout direction. 1883 */ 1884 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1885 1886 /** 1887 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1888 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1889 * If there are neither, the paragraph direction is the view's resolved layout direction. 1890 */ 1891 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1892 1893 /** 1894 * Text direction is forced to LTR. 1895 */ 1896 public static final int TEXT_DIRECTION_LTR = 3; 1897 1898 /** 1899 * Text direction is forced to RTL. 1900 */ 1901 public static final int TEXT_DIRECTION_RTL = 4; 1902 1903 /** 1904 * Text direction is coming from the system Locale. 1905 */ 1906 public static final int TEXT_DIRECTION_LOCALE = 5; 1907 1908 /** 1909 * Default text direction is inherited 1910 */ 1911 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1912 1913 /** 1914 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1915 * @hide 1916 */ 1917 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1918 1919 /** 1920 * Mask for use with private flags indicating bits used for text direction. 1921 * @hide 1922 */ 1923 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1924 1925 /** 1926 * Array of text direction flags for mapping attribute "textDirection" to correct 1927 * flag value. 1928 * @hide 1929 */ 1930 private static final int[] TEXT_DIRECTION_FLAGS = { 1931 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1932 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1933 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1934 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1935 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1936 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1937 }; 1938 1939 /** 1940 * Indicates whether the view text direction has been resolved. 1941 * @hide 1942 */ 1943 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1944 1945 /** 1946 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1947 * @hide 1948 */ 1949 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1950 1951 /** 1952 * Mask for use with private flags indicating bits used for resolved text direction. 1953 * @hide 1954 */ 1955 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1956 1957 /** 1958 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1959 * @hide 1960 */ 1961 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1962 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /* 1965 * Default text alignment. The text alignment of this View is inherited from its parent. 1966 * Use with {@link #setTextAlignment(int)} 1967 */ 1968 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1969 1970 /** 1971 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1972 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1973 * 1974 * Use with {@link #setTextAlignment(int)} 1975 */ 1976 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1977 1978 /** 1979 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1980 * 1981 * Use with {@link #setTextAlignment(int)} 1982 */ 1983 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1984 1985 /** 1986 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1987 * 1988 * Use with {@link #setTextAlignment(int)} 1989 */ 1990 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1991 1992 /** 1993 * Center the paragraph, e.g. ALIGN_CENTER. 1994 * 1995 * Use with {@link #setTextAlignment(int)} 1996 */ 1997 public static final int TEXT_ALIGNMENT_CENTER = 4; 1998 1999 /** 2000 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2001 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2002 * 2003 * Use with {@link #setTextAlignment(int)} 2004 */ 2005 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2006 2007 /** 2008 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2009 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2010 * 2011 * Use with {@link #setTextAlignment(int)} 2012 */ 2013 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2014 2015 /** 2016 * Default text alignment is inherited 2017 */ 2018 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2019 2020 /** 2021 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2022 * @hide 2023 */ 2024 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2025 2026 /** 2027 * Mask for use with private flags indicating bits used for text alignment. 2028 * @hide 2029 */ 2030 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2031 2032 /** 2033 * Array of text direction flags for mapping attribute "textAlignment" to correct 2034 * flag value. 2035 * @hide 2036 */ 2037 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2038 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2039 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2040 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2041 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2042 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2043 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2044 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2045 }; 2046 2047 /** 2048 * Indicates whether the view text alignment has been resolved. 2049 * @hide 2050 */ 2051 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2052 2053 /** 2054 * Bit shift to get the resolved text alignment. 2055 * @hide 2056 */ 2057 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2058 2059 /** 2060 * Mask for use with private flags indicating bits used for text alignment. 2061 * @hide 2062 */ 2063 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2064 2065 /** 2066 * Indicates whether if the view text alignment has been resolved to gravity 2067 */ 2068 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2069 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2070 2071 // Accessiblity constants for mPrivateFlags2 2072 2073 /** 2074 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2075 */ 2076 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2077 2078 /** 2079 * Automatically determine whether a view is important for accessibility. 2080 */ 2081 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2082 2083 /** 2084 * The view is important for accessibility. 2085 */ 2086 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2087 2088 /** 2089 * The view is not important for accessibility. 2090 */ 2091 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2092 2093 /** 2094 * The default whether the view is important for accessiblity. 2095 */ 2096 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2097 2098 /** 2099 * Mask for obtainig the bits which specify how to determine 2100 * whether a view is important for accessibility. 2101 */ 2102 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2103 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2104 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2105 2106 /** 2107 * Flag indicating whether a view has accessibility focus. 2108 */ 2109 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2110 2111 /** 2112 * Flag indicating whether a view state for accessibility has changed. 2113 */ 2114 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2115 2116 /* End of masks for mPrivateFlags2 */ 2117 2118 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2119 2120 /** 2121 * Always allow a user to over-scroll this view, provided it is a 2122 * view that can scroll. 2123 * 2124 * @see #getOverScrollMode() 2125 * @see #setOverScrollMode(int) 2126 */ 2127 public static final int OVER_SCROLL_ALWAYS = 0; 2128 2129 /** 2130 * Allow a user to over-scroll this view only if the content is large 2131 * enough to meaningfully scroll, provided it is a view that can scroll. 2132 * 2133 * @see #getOverScrollMode() 2134 * @see #setOverScrollMode(int) 2135 */ 2136 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2137 2138 /** 2139 * Never allow a user to over-scroll this view. 2140 * 2141 * @see #getOverScrollMode() 2142 * @see #setOverScrollMode(int) 2143 */ 2144 public static final int OVER_SCROLL_NEVER = 2; 2145 2146 /** 2147 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2148 * requested the system UI (status bar) to be visible (the default). 2149 * 2150 * @see #setSystemUiVisibility(int) 2151 */ 2152 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2153 2154 /** 2155 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2156 * system UI to enter an unobtrusive "low profile" mode. 2157 * 2158 * <p>This is for use in games, book readers, video players, or any other 2159 * "immersive" application where the usual system chrome is deemed too distracting. 2160 * 2161 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2162 * 2163 * @see #setSystemUiVisibility(int) 2164 */ 2165 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2166 2167 /** 2168 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2169 * system navigation be temporarily hidden. 2170 * 2171 * <p>This is an even less obtrusive state than that called for by 2172 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2173 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2174 * those to disappear. This is useful (in conjunction with the 2175 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2176 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2177 * window flags) for displaying content using every last pixel on the display. 2178 * 2179 * <p>There is a limitation: because navigation controls are so important, the least user 2180 * interaction will cause them to reappear immediately. When this happens, both 2181 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2182 * so that both elements reappear at the same time. 2183 * 2184 * @see #setSystemUiVisibility(int) 2185 */ 2186 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2187 2188 /** 2189 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2190 * into the normal fullscreen mode so that its content can take over the screen 2191 * while still allowing the user to interact with the application. 2192 * 2193 * <p>This has the same visual effect as 2194 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2195 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2196 * meaning that non-critical screen decorations (such as the status bar) will be 2197 * hidden while the user is in the View's window, focusing the experience on 2198 * that content. Unlike the window flag, if you are using ActionBar in 2199 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2200 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2201 * hide the action bar. 2202 * 2203 * <p>This approach to going fullscreen is best used over the window flag when 2204 * it is a transient state -- that is, the application does this at certain 2205 * points in its user interaction where it wants to allow the user to focus 2206 * on content, but not as a continuous state. For situations where the application 2207 * would like to simply stay full screen the entire time (such as a game that 2208 * wants to take over the screen), the 2209 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2210 * is usually a better approach. The state set here will be removed by the system 2211 * in various situations (such as the user moving to another application) like 2212 * the other system UI states. 2213 * 2214 * <p>When using this flag, the application should provide some easy facility 2215 * for the user to go out of it. A common example would be in an e-book 2216 * reader, where tapping on the screen brings back whatever screen and UI 2217 * decorations that had been hidden while the user was immersed in reading 2218 * the book. 2219 * 2220 * @see #setSystemUiVisibility(int) 2221 */ 2222 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2223 2224 /** 2225 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2226 * flags, we would like a stable view of the content insets given to 2227 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2228 * will always represent the worst case that the application can expect 2229 * as a continue state. In practice this means with any of system bar, 2230 * nav bar, and status bar shown, but not the space that would be needed 2231 * for an input method. 2232 * 2233 * <p>If you are using ActionBar in 2234 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2235 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2236 * insets it adds to those given to the application. 2237 */ 2238 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2239 2240 /** 2241 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2242 * to be layed out as if it has requested 2243 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2244 * allows it to avoid artifacts when switching in and out of that mode, at 2245 * the expense that some of its user interface may be covered by screen 2246 * decorations when they are shown. You can perform layout of your inner 2247 * UI elements to account for the navagation system UI through the 2248 * {@link #fitSystemWindows(Rect)} method. 2249 */ 2250 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2251 2252 /** 2253 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2254 * to be layed out as if it has requested 2255 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2256 * allows it to avoid artifacts when switching in and out of that mode, at 2257 * the expense that some of its user interface may be covered by screen 2258 * decorations when they are shown. You can perform layout of your inner 2259 * UI elements to account for non-fullscreen system UI through the 2260 * {@link #fitSystemWindows(Rect)} method. 2261 */ 2262 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2263 2264 /** 2265 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2266 */ 2267 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2268 2269 /** 2270 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2271 */ 2272 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2273 2274 /** 2275 * @hide 2276 * 2277 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2278 * out of the public fields to keep the undefined bits out of the developer's way. 2279 * 2280 * Flag to make the status bar not expandable. Unless you also 2281 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2282 */ 2283 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2284 2285 /** 2286 * @hide 2287 * 2288 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2289 * out of the public fields to keep the undefined bits out of the developer's way. 2290 * 2291 * Flag to hide notification icons and scrolling ticker text. 2292 */ 2293 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2294 2295 /** 2296 * @hide 2297 * 2298 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2299 * out of the public fields to keep the undefined bits out of the developer's way. 2300 * 2301 * Flag to disable incoming notification alerts. This will not block 2302 * icons, but it will block sound, vibrating and other visual or aural notifications. 2303 */ 2304 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2305 2306 /** 2307 * @hide 2308 * 2309 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2310 * out of the public fields to keep the undefined bits out of the developer's way. 2311 * 2312 * Flag to hide only the scrolling ticker. Note that 2313 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2314 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2315 */ 2316 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2317 2318 /** 2319 * @hide 2320 * 2321 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2322 * out of the public fields to keep the undefined bits out of the developer's way. 2323 * 2324 * Flag to hide the center system info area. 2325 */ 2326 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2327 2328 /** 2329 * @hide 2330 * 2331 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2332 * out of the public fields to keep the undefined bits out of the developer's way. 2333 * 2334 * Flag to hide only the home button. Don't use this 2335 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2336 */ 2337 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2338 2339 /** 2340 * @hide 2341 * 2342 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2343 * out of the public fields to keep the undefined bits out of the developer's way. 2344 * 2345 * Flag to hide only the back button. Don't use this 2346 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2347 */ 2348 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2349 2350 /** 2351 * @hide 2352 * 2353 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2354 * out of the public fields to keep the undefined bits out of the developer's way. 2355 * 2356 * Flag to hide only the clock. You might use this if your activity has 2357 * its own clock making the status bar's clock redundant. 2358 */ 2359 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2360 2361 /** 2362 * @hide 2363 * 2364 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2365 * out of the public fields to keep the undefined bits out of the developer's way. 2366 * 2367 * Flag to hide only the recent apps button. Don't use this 2368 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2369 */ 2370 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2371 2372 /** 2373 * @hide 2374 */ 2375 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2376 2377 /** 2378 * These are the system UI flags that can be cleared by events outside 2379 * of an application. Currently this is just the ability to tap on the 2380 * screen while hiding the navigation bar to have it return. 2381 * @hide 2382 */ 2383 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2384 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2385 | SYSTEM_UI_FLAG_FULLSCREEN; 2386 2387 /** 2388 * Flags that can impact the layout in relation to system UI. 2389 */ 2390 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2391 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2392 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2393 2394 /** 2395 * Find views that render the specified text. 2396 * 2397 * @see #findViewsWithText(ArrayList, CharSequence, int) 2398 */ 2399 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2400 2401 /** 2402 * Find find views that contain the specified content description. 2403 * 2404 * @see #findViewsWithText(ArrayList, CharSequence, int) 2405 */ 2406 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2407 2408 /** 2409 * Find views that contain {@link AccessibilityNodeProvider}. Such 2410 * a View is a root of virtual view hierarchy and may contain the searched 2411 * text. If this flag is set Views with providers are automatically 2412 * added and it is a responsibility of the client to call the APIs of 2413 * the provider to determine whether the virtual tree rooted at this View 2414 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2415 * represeting the virtual views with this text. 2416 * 2417 * @see #findViewsWithText(ArrayList, CharSequence, int) 2418 * 2419 * @hide 2420 */ 2421 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2422 2423 /** 2424 * Indicates that the screen has changed state and is now off. 2425 * 2426 * @see #onScreenStateChanged(int) 2427 */ 2428 public static final int SCREEN_STATE_OFF = 0x0; 2429 2430 /** 2431 * Indicates that the screen has changed state and is now on. 2432 * 2433 * @see #onScreenStateChanged(int) 2434 */ 2435 public static final int SCREEN_STATE_ON = 0x1; 2436 2437 /** 2438 * Controls the over-scroll mode for this view. 2439 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2440 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2441 * and {@link #OVER_SCROLL_NEVER}. 2442 */ 2443 private int mOverScrollMode; 2444 2445 /** 2446 * The parent this view is attached to. 2447 * {@hide} 2448 * 2449 * @see #getParent() 2450 */ 2451 protected ViewParent mParent; 2452 2453 /** 2454 * {@hide} 2455 */ 2456 AttachInfo mAttachInfo; 2457 2458 /** 2459 * {@hide} 2460 */ 2461 @ViewDebug.ExportedProperty(flagMapping = { 2462 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2463 name = "FORCE_LAYOUT"), 2464 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2465 name = "LAYOUT_REQUIRED"), 2466 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2467 name = "DRAWING_CACHE_INVALID", outputIf = false), 2468 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2469 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2470 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2471 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2472 }) 2473 int mPrivateFlags; 2474 int mPrivateFlags2; 2475 2476 /** 2477 * This view's request for the visibility of the status bar. 2478 * @hide 2479 */ 2480 @ViewDebug.ExportedProperty(flagMapping = { 2481 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2482 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2483 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2484 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2485 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2486 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2487 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2488 equals = SYSTEM_UI_FLAG_VISIBLE, 2489 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2490 }) 2491 int mSystemUiVisibility; 2492 2493 /** 2494 * Reference count for transient state. 2495 * @see #setHasTransientState(boolean) 2496 */ 2497 int mTransientStateCount = 0; 2498 2499 /** 2500 * Count of how many windows this view has been attached to. 2501 */ 2502 int mWindowAttachCount; 2503 2504 /** 2505 * The layout parameters associated with this view and used by the parent 2506 * {@link android.view.ViewGroup} to determine how this view should be 2507 * laid out. 2508 * {@hide} 2509 */ 2510 protected ViewGroup.LayoutParams mLayoutParams; 2511 2512 /** 2513 * The view flags hold various views states. 2514 * {@hide} 2515 */ 2516 @ViewDebug.ExportedProperty 2517 int mViewFlags; 2518 2519 static class TransformationInfo { 2520 /** 2521 * The transform matrix for the View. This transform is calculated internally 2522 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2523 * is used by default. Do *not* use this variable directly; instead call 2524 * getMatrix(), which will automatically recalculate the matrix if necessary 2525 * to get the correct matrix based on the latest rotation and scale properties. 2526 */ 2527 private final Matrix mMatrix = new Matrix(); 2528 2529 /** 2530 * The transform matrix for the View. This transform is calculated internally 2531 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2532 * is used by default. Do *not* use this variable directly; instead call 2533 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2534 * to get the correct matrix based on the latest rotation and scale properties. 2535 */ 2536 private Matrix mInverseMatrix; 2537 2538 /** 2539 * An internal variable that tracks whether we need to recalculate the 2540 * transform matrix, based on whether the rotation or scaleX/Y properties 2541 * have changed since the matrix was last calculated. 2542 */ 2543 boolean mMatrixDirty = false; 2544 2545 /** 2546 * An internal variable that tracks whether we need to recalculate the 2547 * transform matrix, based on whether the rotation or scaleX/Y properties 2548 * have changed since the matrix was last calculated. 2549 */ 2550 private boolean mInverseMatrixDirty = true; 2551 2552 /** 2553 * A variable that tracks whether we need to recalculate the 2554 * transform matrix, based on whether the rotation or scaleX/Y properties 2555 * have changed since the matrix was last calculated. This variable 2556 * is only valid after a call to updateMatrix() or to a function that 2557 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2558 */ 2559 private boolean mMatrixIsIdentity = true; 2560 2561 /** 2562 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2563 */ 2564 private Camera mCamera = null; 2565 2566 /** 2567 * This matrix is used when computing the matrix for 3D rotations. 2568 */ 2569 private Matrix matrix3D = null; 2570 2571 /** 2572 * These prev values are used to recalculate a centered pivot point when necessary. The 2573 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2574 * set), so thes values are only used then as well. 2575 */ 2576 private int mPrevWidth = -1; 2577 private int mPrevHeight = -1; 2578 2579 /** 2580 * The degrees rotation around the vertical axis through the pivot point. 2581 */ 2582 @ViewDebug.ExportedProperty 2583 float mRotationY = 0f; 2584 2585 /** 2586 * The degrees rotation around the horizontal axis through the pivot point. 2587 */ 2588 @ViewDebug.ExportedProperty 2589 float mRotationX = 0f; 2590 2591 /** 2592 * The degrees rotation around the pivot point. 2593 */ 2594 @ViewDebug.ExportedProperty 2595 float mRotation = 0f; 2596 2597 /** 2598 * The amount of translation of the object away from its left property (post-layout). 2599 */ 2600 @ViewDebug.ExportedProperty 2601 float mTranslationX = 0f; 2602 2603 /** 2604 * The amount of translation of the object away from its top property (post-layout). 2605 */ 2606 @ViewDebug.ExportedProperty 2607 float mTranslationY = 0f; 2608 2609 /** 2610 * The amount of scale in the x direction around the pivot point. A 2611 * value of 1 means no scaling is applied. 2612 */ 2613 @ViewDebug.ExportedProperty 2614 float mScaleX = 1f; 2615 2616 /** 2617 * The amount of scale in the y direction around the pivot point. A 2618 * value of 1 means no scaling is applied. 2619 */ 2620 @ViewDebug.ExportedProperty 2621 float mScaleY = 1f; 2622 2623 /** 2624 * The x location of the point around which the view is rotated and scaled. 2625 */ 2626 @ViewDebug.ExportedProperty 2627 float mPivotX = 0f; 2628 2629 /** 2630 * The y location of the point around which the view is rotated and scaled. 2631 */ 2632 @ViewDebug.ExportedProperty 2633 float mPivotY = 0f; 2634 2635 /** 2636 * The opacity of the View. This is a value from 0 to 1, where 0 means 2637 * completely transparent and 1 means completely opaque. 2638 */ 2639 @ViewDebug.ExportedProperty 2640 float mAlpha = 1f; 2641 } 2642 2643 TransformationInfo mTransformationInfo; 2644 2645 private boolean mLastIsOpaque; 2646 2647 /** 2648 * Convenience value to check for float values that are close enough to zero to be considered 2649 * zero. 2650 */ 2651 private static final float NONZERO_EPSILON = .001f; 2652 2653 /** 2654 * The distance in pixels from the left edge of this view's parent 2655 * to the left edge of this view. 2656 * {@hide} 2657 */ 2658 @ViewDebug.ExportedProperty(category = "layout") 2659 protected int mLeft; 2660 /** 2661 * The distance in pixels from the left edge of this view's parent 2662 * to the right edge of this view. 2663 * {@hide} 2664 */ 2665 @ViewDebug.ExportedProperty(category = "layout") 2666 protected int mRight; 2667 /** 2668 * The distance in pixels from the top edge of this view's parent 2669 * to the top edge of this view. 2670 * {@hide} 2671 */ 2672 @ViewDebug.ExportedProperty(category = "layout") 2673 protected int mTop; 2674 /** 2675 * The distance in pixels from the top edge of this view's parent 2676 * to the bottom edge of this view. 2677 * {@hide} 2678 */ 2679 @ViewDebug.ExportedProperty(category = "layout") 2680 protected int mBottom; 2681 2682 /** 2683 * The offset, in pixels, by which the content of this view is scrolled 2684 * horizontally. 2685 * {@hide} 2686 */ 2687 @ViewDebug.ExportedProperty(category = "scrolling") 2688 protected int mScrollX; 2689 /** 2690 * The offset, in pixels, by which the content of this view is scrolled 2691 * vertically. 2692 * {@hide} 2693 */ 2694 @ViewDebug.ExportedProperty(category = "scrolling") 2695 protected int mScrollY; 2696 2697 /** 2698 * The left padding in pixels, that is the distance in pixels between the 2699 * left edge of this view and the left edge of its content. 2700 * {@hide} 2701 */ 2702 @ViewDebug.ExportedProperty(category = "padding") 2703 protected int mPaddingLeft; 2704 /** 2705 * The right padding in pixels, that is the distance in pixels between the 2706 * right edge of this view and the right edge of its content. 2707 * {@hide} 2708 */ 2709 @ViewDebug.ExportedProperty(category = "padding") 2710 protected int mPaddingRight; 2711 /** 2712 * The top padding in pixels, that is the distance in pixels between the 2713 * top edge of this view and the top edge of its content. 2714 * {@hide} 2715 */ 2716 @ViewDebug.ExportedProperty(category = "padding") 2717 protected int mPaddingTop; 2718 /** 2719 * The bottom padding in pixels, that is the distance in pixels between the 2720 * bottom edge of this view and the bottom edge of its content. 2721 * {@hide} 2722 */ 2723 @ViewDebug.ExportedProperty(category = "padding") 2724 protected int mPaddingBottom; 2725 2726 /** 2727 * The layout insets in pixels, that is the distance in pixels between the 2728 * visible edges of this view its bounds. 2729 */ 2730 private Insets mLayoutInsets; 2731 2732 /** 2733 * Briefly describes the view and is primarily used for accessibility support. 2734 */ 2735 private CharSequence mContentDescription; 2736 2737 /** 2738 * Cache the paddingRight set by the user to append to the scrollbar's size. 2739 * 2740 * @hide 2741 */ 2742 @ViewDebug.ExportedProperty(category = "padding") 2743 protected int mUserPaddingRight; 2744 2745 /** 2746 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2747 * 2748 * @hide 2749 */ 2750 @ViewDebug.ExportedProperty(category = "padding") 2751 protected int mUserPaddingBottom; 2752 2753 /** 2754 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2755 * 2756 * @hide 2757 */ 2758 @ViewDebug.ExportedProperty(category = "padding") 2759 protected int mUserPaddingLeft; 2760 2761 /** 2762 * Cache if the user padding is relative. 2763 * 2764 */ 2765 @ViewDebug.ExportedProperty(category = "padding") 2766 boolean mUserPaddingRelative; 2767 2768 /** 2769 * Cache the paddingStart set by the user to append to the scrollbar's size. 2770 * 2771 */ 2772 @ViewDebug.ExportedProperty(category = "padding") 2773 int mUserPaddingStart; 2774 2775 /** 2776 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2777 * 2778 */ 2779 @ViewDebug.ExportedProperty(category = "padding") 2780 int mUserPaddingEnd; 2781 2782 /** 2783 * @hide 2784 */ 2785 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2786 /** 2787 * @hide 2788 */ 2789 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2790 2791 private Drawable mBackground; 2792 2793 private int mBackgroundResource; 2794 private boolean mBackgroundSizeChanged; 2795 2796 static class ListenerInfo { 2797 /** 2798 * Listener used to dispatch focus change events. 2799 * This field should be made private, so it is hidden from the SDK. 2800 * {@hide} 2801 */ 2802 protected OnFocusChangeListener mOnFocusChangeListener; 2803 2804 /** 2805 * Listeners for layout change events. 2806 */ 2807 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2808 2809 /** 2810 * Listeners for attach events. 2811 */ 2812 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2813 2814 /** 2815 * Listener used to dispatch click events. 2816 * This field should be made private, so it is hidden from the SDK. 2817 * {@hide} 2818 */ 2819 public OnClickListener mOnClickListener; 2820 2821 /** 2822 * Listener used to dispatch long click events. 2823 * This field should be made private, so it is hidden from the SDK. 2824 * {@hide} 2825 */ 2826 protected OnLongClickListener mOnLongClickListener; 2827 2828 /** 2829 * Listener used to build the context menu. 2830 * This field should be made private, so it is hidden from the SDK. 2831 * {@hide} 2832 */ 2833 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2834 2835 private OnKeyListener mOnKeyListener; 2836 2837 private OnTouchListener mOnTouchListener; 2838 2839 private OnHoverListener mOnHoverListener; 2840 2841 private OnGenericMotionListener mOnGenericMotionListener; 2842 2843 private OnDragListener mOnDragListener; 2844 2845 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2846 } 2847 2848 ListenerInfo mListenerInfo; 2849 2850 /** 2851 * The application environment this view lives in. 2852 * This field should be made private, so it is hidden from the SDK. 2853 * {@hide} 2854 */ 2855 protected Context mContext; 2856 2857 private final Resources mResources; 2858 2859 private ScrollabilityCache mScrollCache; 2860 2861 private int[] mDrawableState = null; 2862 2863 /** 2864 * Set to true when drawing cache is enabled and cannot be created. 2865 * 2866 * @hide 2867 */ 2868 public boolean mCachingFailed; 2869 2870 private Bitmap mDrawingCache; 2871 private Bitmap mUnscaledDrawingCache; 2872 private HardwareLayer mHardwareLayer; 2873 DisplayList mDisplayList; 2874 2875 /** 2876 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2877 * the user may specify which view to go to next. 2878 */ 2879 private int mNextFocusLeftId = View.NO_ID; 2880 2881 /** 2882 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2883 * the user may specify which view to go to next. 2884 */ 2885 private int mNextFocusRightId = View.NO_ID; 2886 2887 /** 2888 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2889 * the user may specify which view to go to next. 2890 */ 2891 private int mNextFocusUpId = View.NO_ID; 2892 2893 /** 2894 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2895 * the user may specify which view to go to next. 2896 */ 2897 private int mNextFocusDownId = View.NO_ID; 2898 2899 /** 2900 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2901 * the user may specify which view to go to next. 2902 */ 2903 int mNextFocusForwardId = View.NO_ID; 2904 2905 private CheckForLongPress mPendingCheckForLongPress; 2906 private CheckForTap mPendingCheckForTap = null; 2907 private PerformClick mPerformClick; 2908 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2909 2910 private UnsetPressedState mUnsetPressedState; 2911 2912 /** 2913 * Whether the long press's action has been invoked. The tap's action is invoked on the 2914 * up event while a long press is invoked as soon as the long press duration is reached, so 2915 * a long press could be performed before the tap is checked, in which case the tap's action 2916 * should not be invoked. 2917 */ 2918 private boolean mHasPerformedLongPress; 2919 2920 /** 2921 * The minimum height of the view. We'll try our best to have the height 2922 * of this view to at least this amount. 2923 */ 2924 @ViewDebug.ExportedProperty(category = "measurement") 2925 private int mMinHeight; 2926 2927 /** 2928 * The minimum width of the view. We'll try our best to have the width 2929 * of this view to at least this amount. 2930 */ 2931 @ViewDebug.ExportedProperty(category = "measurement") 2932 private int mMinWidth; 2933 2934 /** 2935 * The delegate to handle touch events that are physically in this view 2936 * but should be handled by another view. 2937 */ 2938 private TouchDelegate mTouchDelegate = null; 2939 2940 /** 2941 * Solid color to use as a background when creating the drawing cache. Enables 2942 * the cache to use 16 bit bitmaps instead of 32 bit. 2943 */ 2944 private int mDrawingCacheBackgroundColor = 0; 2945 2946 /** 2947 * Special tree observer used when mAttachInfo is null. 2948 */ 2949 private ViewTreeObserver mFloatingTreeObserver; 2950 2951 /** 2952 * Cache the touch slop from the context that created the view. 2953 */ 2954 private int mTouchSlop; 2955 2956 /** 2957 * Object that handles automatic animation of view properties. 2958 */ 2959 private ViewPropertyAnimator mAnimator = null; 2960 2961 /** 2962 * Flag indicating that a drag can cross window boundaries. When 2963 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2964 * with this flag set, all visible applications will be able to participate 2965 * in the drag operation and receive the dragged content. 2966 * 2967 * @hide 2968 */ 2969 public static final int DRAG_FLAG_GLOBAL = 1; 2970 2971 /** 2972 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2973 */ 2974 private float mVerticalScrollFactor; 2975 2976 /** 2977 * Position of the vertical scroll bar. 2978 */ 2979 private int mVerticalScrollbarPosition; 2980 2981 /** 2982 * Position the scroll bar at the default position as determined by the system. 2983 */ 2984 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2985 2986 /** 2987 * Position the scroll bar along the left edge. 2988 */ 2989 public static final int SCROLLBAR_POSITION_LEFT = 1; 2990 2991 /** 2992 * Position the scroll bar along the right edge. 2993 */ 2994 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2995 2996 /** 2997 * Indicates that the view does not have a layer. 2998 * 2999 * @see #getLayerType() 3000 * @see #setLayerType(int, android.graphics.Paint) 3001 * @see #LAYER_TYPE_SOFTWARE 3002 * @see #LAYER_TYPE_HARDWARE 3003 */ 3004 public static final int LAYER_TYPE_NONE = 0; 3005 3006 /** 3007 * <p>Indicates that the view has a software layer. A software layer is backed 3008 * by a bitmap and causes the view to be rendered using Android's software 3009 * rendering pipeline, even if hardware acceleration is enabled.</p> 3010 * 3011 * <p>Software layers have various usages:</p> 3012 * <p>When the application is not using hardware acceleration, a software layer 3013 * is useful to apply a specific color filter and/or blending mode and/or 3014 * translucency to a view and all its children.</p> 3015 * <p>When the application is using hardware acceleration, a software layer 3016 * is useful to render drawing primitives not supported by the hardware 3017 * accelerated pipeline. It can also be used to cache a complex view tree 3018 * into a texture and reduce the complexity of drawing operations. For instance, 3019 * when animating a complex view tree with a translation, a software layer can 3020 * be used to render the view tree only once.</p> 3021 * <p>Software layers should be avoided when the affected view tree updates 3022 * often. Every update will require to re-render the software layer, which can 3023 * potentially be slow (particularly when hardware acceleration is turned on 3024 * since the layer will have to be uploaded into a hardware texture after every 3025 * update.)</p> 3026 * 3027 * @see #getLayerType() 3028 * @see #setLayerType(int, android.graphics.Paint) 3029 * @see #LAYER_TYPE_NONE 3030 * @see #LAYER_TYPE_HARDWARE 3031 */ 3032 public static final int LAYER_TYPE_SOFTWARE = 1; 3033 3034 /** 3035 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3036 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3037 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3038 * rendering pipeline, but only if hardware acceleration is turned on for the 3039 * view hierarchy. When hardware acceleration is turned off, hardware layers 3040 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3041 * 3042 * <p>A hardware layer is useful to apply a specific color filter and/or 3043 * blending mode and/or translucency to a view and all its children.</p> 3044 * <p>A hardware layer can be used to cache a complex view tree into a 3045 * texture and reduce the complexity of drawing operations. For instance, 3046 * when animating a complex view tree with a translation, a hardware layer can 3047 * be used to render the view tree only once.</p> 3048 * <p>A hardware layer can also be used to increase the rendering quality when 3049 * rotation transformations are applied on a view. It can also be used to 3050 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3051 * 3052 * @see #getLayerType() 3053 * @see #setLayerType(int, android.graphics.Paint) 3054 * @see #LAYER_TYPE_NONE 3055 * @see #LAYER_TYPE_SOFTWARE 3056 */ 3057 public static final int LAYER_TYPE_HARDWARE = 2; 3058 3059 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3060 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3061 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3062 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3063 }) 3064 int mLayerType = LAYER_TYPE_NONE; 3065 Paint mLayerPaint; 3066 Rect mLocalDirtyRect; 3067 3068 /** 3069 * Set to true when the view is sending hover accessibility events because it 3070 * is the innermost hovered view. 3071 */ 3072 private boolean mSendingHoverAccessibilityEvents; 3073 3074 /** 3075 * Simple constructor to use when creating a view from code. 3076 * 3077 * @param context The Context the view is running in, through which it can 3078 * access the current theme, resources, etc. 3079 */ 3080 public View(Context context) { 3081 mContext = context; 3082 mResources = context != null ? context.getResources() : null; 3083 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3084 // Set layout and text direction defaults 3085 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3086 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3087 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3088 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3089 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3090 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3091 mUserPaddingStart = -1; 3092 mUserPaddingEnd = -1; 3093 mUserPaddingRelative = false; 3094 } 3095 3096 /** 3097 * Delegate for injecting accessiblity functionality. 3098 */ 3099 AccessibilityDelegate mAccessibilityDelegate; 3100 3101 /** 3102 * Consistency verifier for debugging purposes. 3103 * @hide 3104 */ 3105 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3106 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3107 new InputEventConsistencyVerifier(this, 0) : null; 3108 3109 /** 3110 * Constructor that is called when inflating a view from XML. This is called 3111 * when a view is being constructed from an XML file, supplying attributes 3112 * that were specified in the XML file. This version uses a default style of 3113 * 0, so the only attribute values applied are those in the Context's Theme 3114 * and the given AttributeSet. 3115 * 3116 * <p> 3117 * The method onFinishInflate() will be called after all children have been 3118 * added. 3119 * 3120 * @param context The Context the view is running in, through which it can 3121 * access the current theme, resources, etc. 3122 * @param attrs The attributes of the XML tag that is inflating the view. 3123 * @see #View(Context, AttributeSet, int) 3124 */ 3125 public View(Context context, AttributeSet attrs) { 3126 this(context, attrs, 0); 3127 } 3128 3129 /** 3130 * Perform inflation from XML and apply a class-specific base style. This 3131 * constructor of View allows subclasses to use their own base style when 3132 * they are inflating. For example, a Button class's constructor would call 3133 * this version of the super class constructor and supply 3134 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3135 * the theme's button style to modify all of the base view attributes (in 3136 * particular its background) as well as the Button class's attributes. 3137 * 3138 * @param context The Context the view is running in, through which it can 3139 * access the current theme, resources, etc. 3140 * @param attrs The attributes of the XML tag that is inflating the view. 3141 * @param defStyle The default style to apply to this view. If 0, no style 3142 * will be applied (beyond what is included in the theme). This may 3143 * either be an attribute resource, whose value will be retrieved 3144 * from the current theme, or an explicit style resource. 3145 * @see #View(Context, AttributeSet) 3146 */ 3147 public View(Context context, AttributeSet attrs, int defStyle) { 3148 this(context); 3149 3150 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3151 defStyle, 0); 3152 3153 Drawable background = null; 3154 3155 int leftPadding = -1; 3156 int topPadding = -1; 3157 int rightPadding = -1; 3158 int bottomPadding = -1; 3159 int startPadding = -1; 3160 int endPadding = -1; 3161 3162 int padding = -1; 3163 3164 int viewFlagValues = 0; 3165 int viewFlagMasks = 0; 3166 3167 boolean setScrollContainer = false; 3168 3169 int x = 0; 3170 int y = 0; 3171 3172 float tx = 0; 3173 float ty = 0; 3174 float rotation = 0; 3175 float rotationX = 0; 3176 float rotationY = 0; 3177 float sx = 1f; 3178 float sy = 1f; 3179 boolean transformSet = false; 3180 3181 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3182 3183 int overScrollMode = mOverScrollMode; 3184 final int N = a.getIndexCount(); 3185 for (int i = 0; i < N; i++) { 3186 int attr = a.getIndex(i); 3187 switch (attr) { 3188 case com.android.internal.R.styleable.View_background: 3189 background = a.getDrawable(attr); 3190 break; 3191 case com.android.internal.R.styleable.View_padding: 3192 padding = a.getDimensionPixelSize(attr, -1); 3193 break; 3194 case com.android.internal.R.styleable.View_paddingLeft: 3195 leftPadding = a.getDimensionPixelSize(attr, -1); 3196 break; 3197 case com.android.internal.R.styleable.View_paddingTop: 3198 topPadding = a.getDimensionPixelSize(attr, -1); 3199 break; 3200 case com.android.internal.R.styleable.View_paddingRight: 3201 rightPadding = a.getDimensionPixelSize(attr, -1); 3202 break; 3203 case com.android.internal.R.styleable.View_paddingBottom: 3204 bottomPadding = a.getDimensionPixelSize(attr, -1); 3205 break; 3206 case com.android.internal.R.styleable.View_paddingStart: 3207 startPadding = a.getDimensionPixelSize(attr, -1); 3208 break; 3209 case com.android.internal.R.styleable.View_paddingEnd: 3210 endPadding = a.getDimensionPixelSize(attr, -1); 3211 break; 3212 case com.android.internal.R.styleable.View_scrollX: 3213 x = a.getDimensionPixelOffset(attr, 0); 3214 break; 3215 case com.android.internal.R.styleable.View_scrollY: 3216 y = a.getDimensionPixelOffset(attr, 0); 3217 break; 3218 case com.android.internal.R.styleable.View_alpha: 3219 setAlpha(a.getFloat(attr, 1f)); 3220 break; 3221 case com.android.internal.R.styleable.View_transformPivotX: 3222 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3223 break; 3224 case com.android.internal.R.styleable.View_transformPivotY: 3225 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3226 break; 3227 case com.android.internal.R.styleable.View_translationX: 3228 tx = a.getDimensionPixelOffset(attr, 0); 3229 transformSet = true; 3230 break; 3231 case com.android.internal.R.styleable.View_translationY: 3232 ty = a.getDimensionPixelOffset(attr, 0); 3233 transformSet = true; 3234 break; 3235 case com.android.internal.R.styleable.View_rotation: 3236 rotation = a.getFloat(attr, 0); 3237 transformSet = true; 3238 break; 3239 case com.android.internal.R.styleable.View_rotationX: 3240 rotationX = a.getFloat(attr, 0); 3241 transformSet = true; 3242 break; 3243 case com.android.internal.R.styleable.View_rotationY: 3244 rotationY = a.getFloat(attr, 0); 3245 transformSet = true; 3246 break; 3247 case com.android.internal.R.styleable.View_scaleX: 3248 sx = a.getFloat(attr, 1f); 3249 transformSet = true; 3250 break; 3251 case com.android.internal.R.styleable.View_scaleY: 3252 sy = a.getFloat(attr, 1f); 3253 transformSet = true; 3254 break; 3255 case com.android.internal.R.styleable.View_id: 3256 mID = a.getResourceId(attr, NO_ID); 3257 break; 3258 case com.android.internal.R.styleable.View_tag: 3259 mTag = a.getText(attr); 3260 break; 3261 case com.android.internal.R.styleable.View_fitsSystemWindows: 3262 if (a.getBoolean(attr, false)) { 3263 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3264 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3265 } 3266 break; 3267 case com.android.internal.R.styleable.View_focusable: 3268 if (a.getBoolean(attr, false)) { 3269 viewFlagValues |= FOCUSABLE; 3270 viewFlagMasks |= FOCUSABLE_MASK; 3271 } 3272 break; 3273 case com.android.internal.R.styleable.View_focusableInTouchMode: 3274 if (a.getBoolean(attr, false)) { 3275 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3276 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3277 } 3278 break; 3279 case com.android.internal.R.styleable.View_clickable: 3280 if (a.getBoolean(attr, false)) { 3281 viewFlagValues |= CLICKABLE; 3282 viewFlagMasks |= CLICKABLE; 3283 } 3284 break; 3285 case com.android.internal.R.styleable.View_longClickable: 3286 if (a.getBoolean(attr, false)) { 3287 viewFlagValues |= LONG_CLICKABLE; 3288 viewFlagMasks |= LONG_CLICKABLE; 3289 } 3290 break; 3291 case com.android.internal.R.styleable.View_saveEnabled: 3292 if (!a.getBoolean(attr, true)) { 3293 viewFlagValues |= SAVE_DISABLED; 3294 viewFlagMasks |= SAVE_DISABLED_MASK; 3295 } 3296 break; 3297 case com.android.internal.R.styleable.View_duplicateParentState: 3298 if (a.getBoolean(attr, false)) { 3299 viewFlagValues |= DUPLICATE_PARENT_STATE; 3300 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3301 } 3302 break; 3303 case com.android.internal.R.styleable.View_visibility: 3304 final int visibility = a.getInt(attr, 0); 3305 if (visibility != 0) { 3306 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3307 viewFlagMasks |= VISIBILITY_MASK; 3308 } 3309 break; 3310 case com.android.internal.R.styleable.View_layoutDirection: 3311 // Clear any layout direction flags (included resolved bits) already set 3312 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3313 // Set the layout direction flags depending on the value of the attribute 3314 final int layoutDirection = a.getInt(attr, -1); 3315 final int value = (layoutDirection != -1) ? 3316 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3317 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3318 break; 3319 case com.android.internal.R.styleable.View_drawingCacheQuality: 3320 final int cacheQuality = a.getInt(attr, 0); 3321 if (cacheQuality != 0) { 3322 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3323 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3324 } 3325 break; 3326 case com.android.internal.R.styleable.View_contentDescription: 3327 mContentDescription = a.getString(attr); 3328 break; 3329 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3330 if (!a.getBoolean(attr, true)) { 3331 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3332 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3333 } 3334 break; 3335 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3336 if (!a.getBoolean(attr, true)) { 3337 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3338 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3339 } 3340 break; 3341 case R.styleable.View_scrollbars: 3342 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3343 if (scrollbars != SCROLLBARS_NONE) { 3344 viewFlagValues |= scrollbars; 3345 viewFlagMasks |= SCROLLBARS_MASK; 3346 initializeScrollbars(a); 3347 } 3348 break; 3349 //noinspection deprecation 3350 case R.styleable.View_fadingEdge: 3351 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3352 // Ignore the attribute starting with ICS 3353 break; 3354 } 3355 // With builds < ICS, fall through and apply fading edges 3356 case R.styleable.View_requiresFadingEdge: 3357 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3358 if (fadingEdge != FADING_EDGE_NONE) { 3359 viewFlagValues |= fadingEdge; 3360 viewFlagMasks |= FADING_EDGE_MASK; 3361 initializeFadingEdge(a); 3362 } 3363 break; 3364 case R.styleable.View_scrollbarStyle: 3365 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3366 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3367 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3368 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3369 } 3370 break; 3371 case R.styleable.View_isScrollContainer: 3372 setScrollContainer = true; 3373 if (a.getBoolean(attr, false)) { 3374 setScrollContainer(true); 3375 } 3376 break; 3377 case com.android.internal.R.styleable.View_keepScreenOn: 3378 if (a.getBoolean(attr, false)) { 3379 viewFlagValues |= KEEP_SCREEN_ON; 3380 viewFlagMasks |= KEEP_SCREEN_ON; 3381 } 3382 break; 3383 case R.styleable.View_filterTouchesWhenObscured: 3384 if (a.getBoolean(attr, false)) { 3385 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3386 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3387 } 3388 break; 3389 case R.styleable.View_nextFocusLeft: 3390 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3391 break; 3392 case R.styleable.View_nextFocusRight: 3393 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3394 break; 3395 case R.styleable.View_nextFocusUp: 3396 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3397 break; 3398 case R.styleable.View_nextFocusDown: 3399 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3400 break; 3401 case R.styleable.View_nextFocusForward: 3402 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3403 break; 3404 case R.styleable.View_minWidth: 3405 mMinWidth = a.getDimensionPixelSize(attr, 0); 3406 break; 3407 case R.styleable.View_minHeight: 3408 mMinHeight = a.getDimensionPixelSize(attr, 0); 3409 break; 3410 case R.styleable.View_onClick: 3411 if (context.isRestricted()) { 3412 throw new IllegalStateException("The android:onClick attribute cannot " 3413 + "be used within a restricted context"); 3414 } 3415 3416 final String handlerName = a.getString(attr); 3417 if (handlerName != null) { 3418 setOnClickListener(new OnClickListener() { 3419 private Method mHandler; 3420 3421 public void onClick(View v) { 3422 if (mHandler == null) { 3423 try { 3424 mHandler = getContext().getClass().getMethod(handlerName, 3425 View.class); 3426 } catch (NoSuchMethodException e) { 3427 int id = getId(); 3428 String idText = id == NO_ID ? "" : " with id '" 3429 + getContext().getResources().getResourceEntryName( 3430 id) + "'"; 3431 throw new IllegalStateException("Could not find a method " + 3432 handlerName + "(View) in the activity " 3433 + getContext().getClass() + " for onClick handler" 3434 + " on view " + View.this.getClass() + idText, e); 3435 } 3436 } 3437 3438 try { 3439 mHandler.invoke(getContext(), View.this); 3440 } catch (IllegalAccessException e) { 3441 throw new IllegalStateException("Could not execute non " 3442 + "public method of the activity", e); 3443 } catch (InvocationTargetException e) { 3444 throw new IllegalStateException("Could not execute " 3445 + "method of the activity", e); 3446 } 3447 } 3448 }); 3449 } 3450 break; 3451 case R.styleable.View_overScrollMode: 3452 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3453 break; 3454 case R.styleable.View_verticalScrollbarPosition: 3455 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3456 break; 3457 case R.styleable.View_layerType: 3458 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3459 break; 3460 case R.styleable.View_textDirection: 3461 // Clear any text direction flag already set 3462 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3463 // Set the text direction flags depending on the value of the attribute 3464 final int textDirection = a.getInt(attr, -1); 3465 if (textDirection != -1) { 3466 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3467 } 3468 break; 3469 case R.styleable.View_textAlignment: 3470 // Clear any text alignment flag already set 3471 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3472 // Set the text alignment flag depending on the value of the attribute 3473 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3474 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3475 break; 3476 case R.styleable.View_importantForAccessibility: 3477 setImportantForAccessibility(a.getInt(attr, 3478 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3479 } 3480 } 3481 3482 a.recycle(); 3483 3484 setOverScrollMode(overScrollMode); 3485 3486 if (background != null) { 3487 setBackground(background); 3488 } 3489 3490 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3491 // layout direction). Those cached values will be used later during padding resolution. 3492 mUserPaddingStart = startPadding; 3493 mUserPaddingEnd = endPadding; 3494 3495 updateUserPaddingRelative(); 3496 3497 if (padding >= 0) { 3498 leftPadding = padding; 3499 topPadding = padding; 3500 rightPadding = padding; 3501 bottomPadding = padding; 3502 } 3503 3504 // If the user specified the padding (either with android:padding or 3505 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3506 // use the default padding or the padding from the background drawable 3507 // (stored at this point in mPadding*) 3508 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3509 topPadding >= 0 ? topPadding : mPaddingTop, 3510 rightPadding >= 0 ? rightPadding : mPaddingRight, 3511 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3512 3513 if (viewFlagMasks != 0) { 3514 setFlags(viewFlagValues, viewFlagMasks); 3515 } 3516 3517 // Needs to be called after mViewFlags is set 3518 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3519 recomputePadding(); 3520 } 3521 3522 if (x != 0 || y != 0) { 3523 scrollTo(x, y); 3524 } 3525 3526 if (transformSet) { 3527 setTranslationX(tx); 3528 setTranslationY(ty); 3529 setRotation(rotation); 3530 setRotationX(rotationX); 3531 setRotationY(rotationY); 3532 setScaleX(sx); 3533 setScaleY(sy); 3534 } 3535 3536 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3537 setScrollContainer(true); 3538 } 3539 3540 computeOpaqueFlags(); 3541 } 3542 3543 private void updateUserPaddingRelative() { 3544 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3545 } 3546 3547 /** 3548 * Non-public constructor for use in testing 3549 */ 3550 View() { 3551 mResources = null; 3552 } 3553 3554 /** 3555 * <p> 3556 * Initializes the fading edges from a given set of styled attributes. This 3557 * method should be called by subclasses that need fading edges and when an 3558 * instance of these subclasses is created programmatically rather than 3559 * being inflated from XML. This method is automatically called when the XML 3560 * is inflated. 3561 * </p> 3562 * 3563 * @param a the styled attributes set to initialize the fading edges from 3564 */ 3565 protected void initializeFadingEdge(TypedArray a) { 3566 initScrollCache(); 3567 3568 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3569 R.styleable.View_fadingEdgeLength, 3570 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3571 } 3572 3573 /** 3574 * Returns the size of the vertical faded edges used to indicate that more 3575 * content in this view is visible. 3576 * 3577 * @return The size in pixels of the vertical faded edge or 0 if vertical 3578 * faded edges are not enabled for this view. 3579 * @attr ref android.R.styleable#View_fadingEdgeLength 3580 */ 3581 public int getVerticalFadingEdgeLength() { 3582 if (isVerticalFadingEdgeEnabled()) { 3583 ScrollabilityCache cache = mScrollCache; 3584 if (cache != null) { 3585 return cache.fadingEdgeLength; 3586 } 3587 } 3588 return 0; 3589 } 3590 3591 /** 3592 * Set the size of the faded edge used to indicate that more content in this 3593 * view is available. Will not change whether the fading edge is enabled; use 3594 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3595 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3596 * for the vertical or horizontal fading edges. 3597 * 3598 * @param length The size in pixels of the faded edge used to indicate that more 3599 * content in this view is visible. 3600 */ 3601 public void setFadingEdgeLength(int length) { 3602 initScrollCache(); 3603 mScrollCache.fadingEdgeLength = length; 3604 } 3605 3606 /** 3607 * Returns the size of the horizontal faded edges used to indicate that more 3608 * content in this view is visible. 3609 * 3610 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3611 * faded edges are not enabled for this view. 3612 * @attr ref android.R.styleable#View_fadingEdgeLength 3613 */ 3614 public int getHorizontalFadingEdgeLength() { 3615 if (isHorizontalFadingEdgeEnabled()) { 3616 ScrollabilityCache cache = mScrollCache; 3617 if (cache != null) { 3618 return cache.fadingEdgeLength; 3619 } 3620 } 3621 return 0; 3622 } 3623 3624 /** 3625 * Returns the width of the vertical scrollbar. 3626 * 3627 * @return The width in pixels of the vertical scrollbar or 0 if there 3628 * is no vertical scrollbar. 3629 */ 3630 public int getVerticalScrollbarWidth() { 3631 ScrollabilityCache cache = mScrollCache; 3632 if (cache != null) { 3633 ScrollBarDrawable scrollBar = cache.scrollBar; 3634 if (scrollBar != null) { 3635 int size = scrollBar.getSize(true); 3636 if (size <= 0) { 3637 size = cache.scrollBarSize; 3638 } 3639 return size; 3640 } 3641 return 0; 3642 } 3643 return 0; 3644 } 3645 3646 /** 3647 * Returns the height of the horizontal scrollbar. 3648 * 3649 * @return The height in pixels of the horizontal scrollbar or 0 if 3650 * there is no horizontal scrollbar. 3651 */ 3652 protected int getHorizontalScrollbarHeight() { 3653 ScrollabilityCache cache = mScrollCache; 3654 if (cache != null) { 3655 ScrollBarDrawable scrollBar = cache.scrollBar; 3656 if (scrollBar != null) { 3657 int size = scrollBar.getSize(false); 3658 if (size <= 0) { 3659 size = cache.scrollBarSize; 3660 } 3661 return size; 3662 } 3663 return 0; 3664 } 3665 return 0; 3666 } 3667 3668 /** 3669 * <p> 3670 * Initializes the scrollbars from a given set of styled attributes. This 3671 * method should be called by subclasses that need scrollbars and when an 3672 * instance of these subclasses is created programmatically rather than 3673 * being inflated from XML. This method is automatically called when the XML 3674 * is inflated. 3675 * </p> 3676 * 3677 * @param a the styled attributes set to initialize the scrollbars from 3678 */ 3679 protected void initializeScrollbars(TypedArray a) { 3680 initScrollCache(); 3681 3682 final ScrollabilityCache scrollabilityCache = mScrollCache; 3683 3684 if (scrollabilityCache.scrollBar == null) { 3685 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3686 } 3687 3688 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3689 3690 if (!fadeScrollbars) { 3691 scrollabilityCache.state = ScrollabilityCache.ON; 3692 } 3693 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3694 3695 3696 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3697 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3698 .getScrollBarFadeDuration()); 3699 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3700 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3701 ViewConfiguration.getScrollDefaultDelay()); 3702 3703 3704 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3705 com.android.internal.R.styleable.View_scrollbarSize, 3706 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3707 3708 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3709 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3710 3711 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3712 if (thumb != null) { 3713 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3714 } 3715 3716 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3717 false); 3718 if (alwaysDraw) { 3719 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3720 } 3721 3722 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3723 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3724 3725 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3726 if (thumb != null) { 3727 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3728 } 3729 3730 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3731 false); 3732 if (alwaysDraw) { 3733 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3734 } 3735 3736 // Re-apply user/background padding so that scrollbar(s) get added 3737 resolvePadding(); 3738 } 3739 3740 /** 3741 * <p> 3742 * Initalizes the scrollability cache if necessary. 3743 * </p> 3744 */ 3745 private void initScrollCache() { 3746 if (mScrollCache == null) { 3747 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3748 } 3749 } 3750 3751 private ScrollabilityCache getScrollCache() { 3752 initScrollCache(); 3753 return mScrollCache; 3754 } 3755 3756 /** 3757 * Set the position of the vertical scroll bar. Should be one of 3758 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3759 * {@link #SCROLLBAR_POSITION_RIGHT}. 3760 * 3761 * @param position Where the vertical scroll bar should be positioned. 3762 */ 3763 public void setVerticalScrollbarPosition(int position) { 3764 if (mVerticalScrollbarPosition != position) { 3765 mVerticalScrollbarPosition = position; 3766 computeOpaqueFlags(); 3767 resolvePadding(); 3768 } 3769 } 3770 3771 /** 3772 * @return The position where the vertical scroll bar will show, if applicable. 3773 * @see #setVerticalScrollbarPosition(int) 3774 */ 3775 public int getVerticalScrollbarPosition() { 3776 return mVerticalScrollbarPosition; 3777 } 3778 3779 ListenerInfo getListenerInfo() { 3780 if (mListenerInfo != null) { 3781 return mListenerInfo; 3782 } 3783 mListenerInfo = new ListenerInfo(); 3784 return mListenerInfo; 3785 } 3786 3787 /** 3788 * Register a callback to be invoked when focus of this view changed. 3789 * 3790 * @param l The callback that will run. 3791 */ 3792 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3793 getListenerInfo().mOnFocusChangeListener = l; 3794 } 3795 3796 /** 3797 * Add a listener that will be called when the bounds of the view change due to 3798 * layout processing. 3799 * 3800 * @param listener The listener that will be called when layout bounds change. 3801 */ 3802 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3803 ListenerInfo li = getListenerInfo(); 3804 if (li.mOnLayoutChangeListeners == null) { 3805 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3806 } 3807 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3808 li.mOnLayoutChangeListeners.add(listener); 3809 } 3810 } 3811 3812 /** 3813 * Remove a listener for layout changes. 3814 * 3815 * @param listener The listener for layout bounds change. 3816 */ 3817 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3818 ListenerInfo li = mListenerInfo; 3819 if (li == null || li.mOnLayoutChangeListeners == null) { 3820 return; 3821 } 3822 li.mOnLayoutChangeListeners.remove(listener); 3823 } 3824 3825 /** 3826 * Add a listener for attach state changes. 3827 * 3828 * This listener will be called whenever this view is attached or detached 3829 * from a window. Remove the listener using 3830 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3831 * 3832 * @param listener Listener to attach 3833 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3834 */ 3835 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3836 ListenerInfo li = getListenerInfo(); 3837 if (li.mOnAttachStateChangeListeners == null) { 3838 li.mOnAttachStateChangeListeners 3839 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3840 } 3841 li.mOnAttachStateChangeListeners.add(listener); 3842 } 3843 3844 /** 3845 * Remove a listener for attach state changes. The listener will receive no further 3846 * notification of window attach/detach events. 3847 * 3848 * @param listener Listener to remove 3849 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3850 */ 3851 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3852 ListenerInfo li = mListenerInfo; 3853 if (li == null || li.mOnAttachStateChangeListeners == null) { 3854 return; 3855 } 3856 li.mOnAttachStateChangeListeners.remove(listener); 3857 } 3858 3859 /** 3860 * Returns the focus-change callback registered for this view. 3861 * 3862 * @return The callback, or null if one is not registered. 3863 */ 3864 public OnFocusChangeListener getOnFocusChangeListener() { 3865 ListenerInfo li = mListenerInfo; 3866 return li != null ? li.mOnFocusChangeListener : null; 3867 } 3868 3869 /** 3870 * Register a callback to be invoked when this view is clicked. If this view is not 3871 * clickable, it becomes clickable. 3872 * 3873 * @param l The callback that will run 3874 * 3875 * @see #setClickable(boolean) 3876 */ 3877 public void setOnClickListener(OnClickListener l) { 3878 if (!isClickable()) { 3879 setClickable(true); 3880 } 3881 getListenerInfo().mOnClickListener = l; 3882 } 3883 3884 /** 3885 * Return whether this view has an attached OnClickListener. Returns 3886 * true if there is a listener, false if there is none. 3887 */ 3888 public boolean hasOnClickListeners() { 3889 ListenerInfo li = mListenerInfo; 3890 return (li != null && li.mOnClickListener != null); 3891 } 3892 3893 /** 3894 * Register a callback to be invoked when this view is clicked and held. If this view is not 3895 * long clickable, it becomes long clickable. 3896 * 3897 * @param l The callback that will run 3898 * 3899 * @see #setLongClickable(boolean) 3900 */ 3901 public void setOnLongClickListener(OnLongClickListener l) { 3902 if (!isLongClickable()) { 3903 setLongClickable(true); 3904 } 3905 getListenerInfo().mOnLongClickListener = l; 3906 } 3907 3908 /** 3909 * Register a callback to be invoked when the context menu for this view is 3910 * being built. If this view is not long clickable, it becomes long clickable. 3911 * 3912 * @param l The callback that will run 3913 * 3914 */ 3915 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3916 if (!isLongClickable()) { 3917 setLongClickable(true); 3918 } 3919 getListenerInfo().mOnCreateContextMenuListener = l; 3920 } 3921 3922 /** 3923 * Call this view's OnClickListener, if it is defined. Performs all normal 3924 * actions associated with clicking: reporting accessibility event, playing 3925 * a sound, etc. 3926 * 3927 * @return True there was an assigned OnClickListener that was called, false 3928 * otherwise is returned. 3929 */ 3930 public boolean performClick() { 3931 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3932 3933 ListenerInfo li = mListenerInfo; 3934 if (li != null && li.mOnClickListener != null) { 3935 playSoundEffect(SoundEffectConstants.CLICK); 3936 li.mOnClickListener.onClick(this); 3937 return true; 3938 } 3939 3940 return false; 3941 } 3942 3943 /** 3944 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3945 * this only calls the listener, and does not do any associated clicking 3946 * actions like reporting an accessibility event. 3947 * 3948 * @return True there was an assigned OnClickListener that was called, false 3949 * otherwise is returned. 3950 */ 3951 public boolean callOnClick() { 3952 ListenerInfo li = mListenerInfo; 3953 if (li != null && li.mOnClickListener != null) { 3954 li.mOnClickListener.onClick(this); 3955 return true; 3956 } 3957 return false; 3958 } 3959 3960 /** 3961 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3962 * OnLongClickListener did not consume the event. 3963 * 3964 * @return True if one of the above receivers consumed the event, false otherwise. 3965 */ 3966 public boolean performLongClick() { 3967 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3968 3969 boolean handled = false; 3970 ListenerInfo li = mListenerInfo; 3971 if (li != null && li.mOnLongClickListener != null) { 3972 handled = li.mOnLongClickListener.onLongClick(View.this); 3973 } 3974 if (!handled) { 3975 handled = showContextMenu(); 3976 } 3977 if (handled) { 3978 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3979 } 3980 return handled; 3981 } 3982 3983 /** 3984 * Performs button-related actions during a touch down event. 3985 * 3986 * @param event The event. 3987 * @return True if the down was consumed. 3988 * 3989 * @hide 3990 */ 3991 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3992 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3993 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3994 return true; 3995 } 3996 } 3997 return false; 3998 } 3999 4000 /** 4001 * Bring up the context menu for this view. 4002 * 4003 * @return Whether a context menu was displayed. 4004 */ 4005 public boolean showContextMenu() { 4006 return getParent().showContextMenuForChild(this); 4007 } 4008 4009 /** 4010 * Bring up the context menu for this view, referring to the item under the specified point. 4011 * 4012 * @param x The referenced x coordinate. 4013 * @param y The referenced y coordinate. 4014 * @param metaState The keyboard modifiers that were pressed. 4015 * @return Whether a context menu was displayed. 4016 * 4017 * @hide 4018 */ 4019 public boolean showContextMenu(float x, float y, int metaState) { 4020 return showContextMenu(); 4021 } 4022 4023 /** 4024 * Start an action mode. 4025 * 4026 * @param callback Callback that will control the lifecycle of the action mode 4027 * @return The new action mode if it is started, null otherwise 4028 * 4029 * @see ActionMode 4030 */ 4031 public ActionMode startActionMode(ActionMode.Callback callback) { 4032 ViewParent parent = getParent(); 4033 if (parent == null) return null; 4034 return parent.startActionModeForChild(this, callback); 4035 } 4036 4037 /** 4038 * Register a callback to be invoked when a key is pressed in this view. 4039 * @param l the key listener to attach to this view 4040 */ 4041 public void setOnKeyListener(OnKeyListener l) { 4042 getListenerInfo().mOnKeyListener = l; 4043 } 4044 4045 /** 4046 * Register a callback to be invoked when a touch event is sent to this view. 4047 * @param l the touch listener to attach to this view 4048 */ 4049 public void setOnTouchListener(OnTouchListener l) { 4050 getListenerInfo().mOnTouchListener = l; 4051 } 4052 4053 /** 4054 * Register a callback to be invoked when a generic motion event is sent to this view. 4055 * @param l the generic motion listener to attach to this view 4056 */ 4057 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4058 getListenerInfo().mOnGenericMotionListener = l; 4059 } 4060 4061 /** 4062 * Register a callback to be invoked when a hover event is sent to this view. 4063 * @param l the hover listener to attach to this view 4064 */ 4065 public void setOnHoverListener(OnHoverListener l) { 4066 getListenerInfo().mOnHoverListener = l; 4067 } 4068 4069 /** 4070 * Register a drag event listener callback object for this View. The parameter is 4071 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4072 * View, the system calls the 4073 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4074 * @param l An implementation of {@link android.view.View.OnDragListener}. 4075 */ 4076 public void setOnDragListener(OnDragListener l) { 4077 getListenerInfo().mOnDragListener = l; 4078 } 4079 4080 /** 4081 * Give this view focus. This will cause 4082 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4083 * 4084 * Note: this does not check whether this {@link View} should get focus, it just 4085 * gives it focus no matter what. It should only be called internally by framework 4086 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4087 * 4088 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4089 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4090 * focus moved when requestFocus() is called. It may not always 4091 * apply, in which case use the default View.FOCUS_DOWN. 4092 * @param previouslyFocusedRect The rectangle of the view that had focus 4093 * prior in this View's coordinate system. 4094 */ 4095 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4096 if (DBG) { 4097 System.out.println(this + " requestFocus()"); 4098 } 4099 4100 if ((mPrivateFlags & FOCUSED) == 0) { 4101 mPrivateFlags |= FOCUSED; 4102 4103 if (mParent != null) { 4104 mParent.requestChildFocus(this, this); 4105 } 4106 4107 onFocusChanged(true, direction, previouslyFocusedRect); 4108 refreshDrawableState(); 4109 4110 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4111 notifyAccessibilityStateChanged(); 4112 } 4113 } 4114 } 4115 4116 /** 4117 * Request that a rectangle of this view be visible on the screen, 4118 * scrolling if necessary just enough. 4119 * 4120 * <p>A View should call this if it maintains some notion of which part 4121 * of its content is interesting. For example, a text editing view 4122 * should call this when its cursor moves. 4123 * 4124 * @param rectangle The rectangle. 4125 * @return Whether any parent scrolled. 4126 */ 4127 public boolean requestRectangleOnScreen(Rect rectangle) { 4128 return requestRectangleOnScreen(rectangle, false); 4129 } 4130 4131 /** 4132 * Request that a rectangle of this view be visible on the screen, 4133 * scrolling if necessary just enough. 4134 * 4135 * <p>A View should call this if it maintains some notion of which part 4136 * of its content is interesting. For example, a text editing view 4137 * should call this when its cursor moves. 4138 * 4139 * <p>When <code>immediate</code> is set to true, scrolling will not be 4140 * animated. 4141 * 4142 * @param rectangle The rectangle. 4143 * @param immediate True to forbid animated scrolling, false otherwise 4144 * @return Whether any parent scrolled. 4145 */ 4146 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4147 View child = this; 4148 ViewParent parent = mParent; 4149 boolean scrolled = false; 4150 while (parent != null) { 4151 scrolled |= parent.requestChildRectangleOnScreen(child, 4152 rectangle, immediate); 4153 4154 // offset rect so next call has the rectangle in the 4155 // coordinate system of its direct child. 4156 rectangle.offset(child.getLeft(), child.getTop()); 4157 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4158 4159 if (!(parent instanceof View)) { 4160 break; 4161 } 4162 4163 child = (View) parent; 4164 parent = child.getParent(); 4165 } 4166 return scrolled; 4167 } 4168 4169 /** 4170 * Called when this view wants to give up focus. If focus is cleared 4171 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4172 * <p> 4173 * <strong>Note:</strong> When a View clears focus the framework is trying 4174 * to give focus to the first focusable View from the top. Hence, if this 4175 * View is the first from the top that can take focus, then all callbacks 4176 * related to clearing focus will be invoked after wich the framework will 4177 * give focus to this view. 4178 * </p> 4179 */ 4180 public void clearFocus() { 4181 if (DBG) { 4182 System.out.println(this + " clearFocus()"); 4183 } 4184 4185 if ((mPrivateFlags & FOCUSED) != 0) { 4186 mPrivateFlags &= ~FOCUSED; 4187 4188 if (mParent != null) { 4189 mParent.clearChildFocus(this); 4190 } 4191 4192 onFocusChanged(false, 0, null); 4193 4194 refreshDrawableState(); 4195 4196 ensureInputFocusOnFirstFocusable(); 4197 4198 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4199 notifyAccessibilityStateChanged(); 4200 } 4201 } 4202 } 4203 4204 void ensureInputFocusOnFirstFocusable() { 4205 View root = getRootView(); 4206 if (root != null) { 4207 root.requestFocus(); 4208 } 4209 } 4210 4211 /** 4212 * Called internally by the view system when a new view is getting focus. 4213 * This is what clears the old focus. 4214 */ 4215 void unFocus() { 4216 if (DBG) { 4217 System.out.println(this + " unFocus()"); 4218 } 4219 4220 if ((mPrivateFlags & FOCUSED) != 0) { 4221 mPrivateFlags &= ~FOCUSED; 4222 4223 onFocusChanged(false, 0, null); 4224 refreshDrawableState(); 4225 4226 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4227 notifyAccessibilityStateChanged(); 4228 } 4229 } 4230 } 4231 4232 /** 4233 * Returns true if this view has focus iteself, or is the ancestor of the 4234 * view that has focus. 4235 * 4236 * @return True if this view has or contains focus, false otherwise. 4237 */ 4238 @ViewDebug.ExportedProperty(category = "focus") 4239 public boolean hasFocus() { 4240 return (mPrivateFlags & FOCUSED) != 0; 4241 } 4242 4243 /** 4244 * Returns true if this view is focusable or if it contains a reachable View 4245 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4246 * is a View whose parents do not block descendants focus. 4247 * 4248 * Only {@link #VISIBLE} views are considered focusable. 4249 * 4250 * @return True if the view is focusable or if the view contains a focusable 4251 * View, false otherwise. 4252 * 4253 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4254 */ 4255 public boolean hasFocusable() { 4256 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4257 } 4258 4259 /** 4260 * Called by the view system when the focus state of this view changes. 4261 * When the focus change event is caused by directional navigation, direction 4262 * and previouslyFocusedRect provide insight into where the focus is coming from. 4263 * When overriding, be sure to call up through to the super class so that 4264 * the standard focus handling will occur. 4265 * 4266 * @param gainFocus True if the View has focus; false otherwise. 4267 * @param direction The direction focus has moved when requestFocus() 4268 * is called to give this view focus. Values are 4269 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4270 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4271 * It may not always apply, in which case use the default. 4272 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4273 * system, of the previously focused view. If applicable, this will be 4274 * passed in as finer grained information about where the focus is coming 4275 * from (in addition to direction). Will be <code>null</code> otherwise. 4276 */ 4277 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4278 if (gainFocus) { 4279 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4280 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4281 requestAccessibilityFocus(); 4282 } 4283 } 4284 4285 InputMethodManager imm = InputMethodManager.peekInstance(); 4286 if (!gainFocus) { 4287 if (isPressed()) { 4288 setPressed(false); 4289 } 4290 if (imm != null && mAttachInfo != null 4291 && mAttachInfo.mHasWindowFocus) { 4292 imm.focusOut(this); 4293 } 4294 onFocusLost(); 4295 } else if (imm != null && mAttachInfo != null 4296 && mAttachInfo.mHasWindowFocus) { 4297 imm.focusIn(this); 4298 } 4299 4300 invalidate(true); 4301 ListenerInfo li = mListenerInfo; 4302 if (li != null && li.mOnFocusChangeListener != null) { 4303 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4304 } 4305 4306 if (mAttachInfo != null) { 4307 mAttachInfo.mKeyDispatchState.reset(this); 4308 } 4309 } 4310 4311 /** 4312 * Sends an accessibility event of the given type. If accessiiblity is 4313 * not enabled this method has no effect. The default implementation calls 4314 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4315 * to populate information about the event source (this View), then calls 4316 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4317 * populate the text content of the event source including its descendants, 4318 * and last calls 4319 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4320 * on its parent to resuest sending of the event to interested parties. 4321 * <p> 4322 * If an {@link AccessibilityDelegate} has been specified via calling 4323 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4324 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4325 * responsible for handling this call. 4326 * </p> 4327 * 4328 * @param eventType The type of the event to send, as defined by several types from 4329 * {@link android.view.accessibility.AccessibilityEvent}, such as 4330 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4331 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4332 * 4333 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4334 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4335 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4336 * @see AccessibilityDelegate 4337 */ 4338 public void sendAccessibilityEvent(int eventType) { 4339 if (mAccessibilityDelegate != null) { 4340 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4341 } else { 4342 sendAccessibilityEventInternal(eventType); 4343 } 4344 } 4345 4346 /** 4347 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4348 * {@link AccessibilityEvent} to make an announcement which is related to some 4349 * sort of a context change for which none of the events representing UI transitions 4350 * is a good fit. For example, announcing a new page in a book. If accessibility 4351 * is not enabled this method does nothing. 4352 * 4353 * @param text The announcement text. 4354 */ 4355 public void announceForAccessibility(CharSequence text) { 4356 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4357 AccessibilityEvent event = AccessibilityEvent.obtain( 4358 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4359 event.getText().add(text); 4360 sendAccessibilityEventUnchecked(event); 4361 } 4362 } 4363 4364 /** 4365 * @see #sendAccessibilityEvent(int) 4366 * 4367 * Note: Called from the default {@link AccessibilityDelegate}. 4368 */ 4369 void sendAccessibilityEventInternal(int eventType) { 4370 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4371 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4372 } 4373 } 4374 4375 /** 4376 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4377 * takes as an argument an empty {@link AccessibilityEvent} and does not 4378 * perform a check whether accessibility is enabled. 4379 * <p> 4380 * If an {@link AccessibilityDelegate} has been specified via calling 4381 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4382 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4383 * is responsible for handling this call. 4384 * </p> 4385 * 4386 * @param event The event to send. 4387 * 4388 * @see #sendAccessibilityEvent(int) 4389 */ 4390 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4391 if (mAccessibilityDelegate != null) { 4392 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4393 } else { 4394 sendAccessibilityEventUncheckedInternal(event); 4395 } 4396 } 4397 4398 /** 4399 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4400 * 4401 * Note: Called from the default {@link AccessibilityDelegate}. 4402 */ 4403 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4404 if (!isShown()) { 4405 return; 4406 } 4407 onInitializeAccessibilityEvent(event); 4408 // Only a subset of accessibility events populates text content. 4409 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4410 dispatchPopulateAccessibilityEvent(event); 4411 } 4412 // Intercept accessibility focus events fired by virtual nodes to keep 4413 // track of accessibility focus position in such nodes. 4414 final int eventType = event.getEventType(); 4415 switch (eventType) { 4416 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4417 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4418 event.getSourceNodeId()); 4419 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4420 ViewRootImpl viewRootImpl = getViewRootImpl(); 4421 if (viewRootImpl != null) { 4422 viewRootImpl.setAccessibilityFocusedHost(this); 4423 } 4424 } 4425 } break; 4426 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4427 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4428 event.getSourceNodeId()); 4429 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4430 ViewRootImpl viewRootImpl = getViewRootImpl(); 4431 if (viewRootImpl != null) { 4432 viewRootImpl.setAccessibilityFocusedHost(null); 4433 } 4434 } 4435 } break; 4436 } 4437 // In the beginning we called #isShown(), so we know that getParent() is not null. 4438 getParent().requestSendAccessibilityEvent(this, event); 4439 } 4440 4441 /** 4442 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4443 * to its children for adding their text content to the event. Note that the 4444 * event text is populated in a separate dispatch path since we add to the 4445 * event not only the text of the source but also the text of all its descendants. 4446 * A typical implementation will call 4447 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4448 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4449 * on each child. Override this method if custom population of the event text 4450 * content is required. 4451 * <p> 4452 * If an {@link AccessibilityDelegate} has been specified via calling 4453 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4454 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4455 * is responsible for handling this call. 4456 * </p> 4457 * <p> 4458 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4459 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4460 * </p> 4461 * 4462 * @param event The event. 4463 * 4464 * @return True if the event population was completed. 4465 */ 4466 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4467 if (mAccessibilityDelegate != null) { 4468 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4469 } else { 4470 return dispatchPopulateAccessibilityEventInternal(event); 4471 } 4472 } 4473 4474 /** 4475 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4476 * 4477 * Note: Called from the default {@link AccessibilityDelegate}. 4478 */ 4479 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4480 onPopulateAccessibilityEvent(event); 4481 return false; 4482 } 4483 4484 /** 4485 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4486 * giving a chance to this View to populate the accessibility event with its 4487 * text content. While this method is free to modify event 4488 * attributes other than text content, doing so should normally be performed in 4489 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4490 * <p> 4491 * Example: Adding formatted date string to an accessibility event in addition 4492 * to the text added by the super implementation: 4493 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4494 * super.onPopulateAccessibilityEvent(event); 4495 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4496 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4497 * mCurrentDate.getTimeInMillis(), flags); 4498 * event.getText().add(selectedDateUtterance); 4499 * }</pre> 4500 * <p> 4501 * If an {@link AccessibilityDelegate} has been specified via calling 4502 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4503 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4504 * is responsible for handling this call. 4505 * </p> 4506 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4507 * information to the event, in case the default implementation has basic information to add. 4508 * </p> 4509 * 4510 * @param event The accessibility event which to populate. 4511 * 4512 * @see #sendAccessibilityEvent(int) 4513 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4514 */ 4515 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4516 if (mAccessibilityDelegate != null) { 4517 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4518 } else { 4519 onPopulateAccessibilityEventInternal(event); 4520 } 4521 } 4522 4523 /** 4524 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4525 * 4526 * Note: Called from the default {@link AccessibilityDelegate}. 4527 */ 4528 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4529 4530 } 4531 4532 /** 4533 * Initializes an {@link AccessibilityEvent} with information about 4534 * this View which is the event source. In other words, the source of 4535 * an accessibility event is the view whose state change triggered firing 4536 * the event. 4537 * <p> 4538 * Example: Setting the password property of an event in addition 4539 * to properties set by the super implementation: 4540 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4541 * super.onInitializeAccessibilityEvent(event); 4542 * event.setPassword(true); 4543 * }</pre> 4544 * <p> 4545 * If an {@link AccessibilityDelegate} has been specified via calling 4546 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4547 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4548 * is responsible for handling this call. 4549 * </p> 4550 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4551 * information to the event, in case the default implementation has basic information to add. 4552 * </p> 4553 * @param event The event to initialize. 4554 * 4555 * @see #sendAccessibilityEvent(int) 4556 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4557 */ 4558 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4559 if (mAccessibilityDelegate != null) { 4560 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4561 } else { 4562 onInitializeAccessibilityEventInternal(event); 4563 } 4564 } 4565 4566 /** 4567 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4568 * 4569 * Note: Called from the default {@link AccessibilityDelegate}. 4570 */ 4571 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4572 event.setSource(this); 4573 event.setClassName(View.class.getName()); 4574 event.setPackageName(getContext().getPackageName()); 4575 event.setEnabled(isEnabled()); 4576 event.setContentDescription(mContentDescription); 4577 4578 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4579 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4580 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4581 FOCUSABLES_ALL); 4582 event.setItemCount(focusablesTempList.size()); 4583 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4584 focusablesTempList.clear(); 4585 } 4586 } 4587 4588 /** 4589 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4590 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4591 * This method is responsible for obtaining an accessibility node info from a 4592 * pool of reusable instances and calling 4593 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4594 * initialize the former. 4595 * <p> 4596 * Note: The client is responsible for recycling the obtained instance by calling 4597 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4598 * </p> 4599 * 4600 * @return A populated {@link AccessibilityNodeInfo}. 4601 * 4602 * @see AccessibilityNodeInfo 4603 */ 4604 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4605 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4606 if (provider != null) { 4607 return provider.createAccessibilityNodeInfo(View.NO_ID); 4608 } else { 4609 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4610 onInitializeAccessibilityNodeInfo(info); 4611 return info; 4612 } 4613 } 4614 4615 /** 4616 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4617 * The base implementation sets: 4618 * <ul> 4619 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4620 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4621 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4622 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4623 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4624 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4625 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4626 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4627 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4628 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4629 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4630 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4631 * </ul> 4632 * <p> 4633 * Subclasses should override this method, call the super implementation, 4634 * and set additional attributes. 4635 * </p> 4636 * <p> 4637 * If an {@link AccessibilityDelegate} has been specified via calling 4638 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4639 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4640 * is responsible for handling this call. 4641 * </p> 4642 * 4643 * @param info The instance to initialize. 4644 */ 4645 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4646 if (mAccessibilityDelegate != null) { 4647 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4648 } else { 4649 onInitializeAccessibilityNodeInfoInternal(info); 4650 } 4651 } 4652 4653 /** 4654 * Gets the location of this view in screen coordintates. 4655 * 4656 * @param outRect The output location 4657 */ 4658 private void getBoundsOnScreen(Rect outRect) { 4659 if (mAttachInfo == null) { 4660 return; 4661 } 4662 4663 RectF position = mAttachInfo.mTmpTransformRect; 4664 position.setEmpty(); 4665 4666 if (!hasIdentityMatrix()) { 4667 getMatrix().mapRect(position); 4668 } 4669 4670 position.offset(mLeft, mRight); 4671 4672 ViewParent parent = mParent; 4673 while (parent instanceof View) { 4674 View parentView = (View) parent; 4675 4676 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4677 4678 if (!parentView.hasIdentityMatrix()) { 4679 parentView.getMatrix().mapRect(position); 4680 } 4681 4682 position.offset(parentView.mLeft, parentView.mTop); 4683 4684 parent = parentView.mParent; 4685 } 4686 4687 if (parent instanceof ViewRootImpl) { 4688 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4689 position.offset(0, -viewRootImpl.mCurScrollY); 4690 } 4691 4692 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4693 4694 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4695 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4696 } 4697 4698 /** 4699 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4700 * 4701 * Note: Called from the default {@link AccessibilityDelegate}. 4702 */ 4703 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4704 Rect bounds = mAttachInfo.mTmpInvalRect; 4705 getDrawingRect(bounds); 4706 info.setBoundsInParent(bounds); 4707 4708 getBoundsOnScreen(bounds); 4709 info.setBoundsInScreen(bounds); 4710 4711 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4712 ViewParent parent = getParentForAccessibility(); 4713 if (parent instanceof View) { 4714 info.setParent((View) parent); 4715 } 4716 } 4717 4718 info.setVisibleToUser(isVisibleToUser()); 4719 4720 info.setPackageName(mContext.getPackageName()); 4721 info.setClassName(View.class.getName()); 4722 info.setContentDescription(getContentDescription()); 4723 4724 info.setEnabled(isEnabled()); 4725 info.setClickable(isClickable()); 4726 info.setFocusable(isFocusable()); 4727 info.setFocused(isFocused()); 4728 info.setAccessibilityFocused(isAccessibilityFocused()); 4729 info.setSelected(isSelected()); 4730 info.setLongClickable(isLongClickable()); 4731 4732 // TODO: These make sense only if we are in an AdapterView but all 4733 // views can be selected. Maybe from accessiiblity perspective 4734 // we should report as selectable view in an AdapterView. 4735 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4736 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4737 4738 if (isFocusable()) { 4739 if (isFocused()) { 4740 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4741 } else { 4742 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4743 } 4744 } 4745 4746 if (!isAccessibilityFocused()) { 4747 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4748 } else { 4749 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4750 } 4751 4752 if (isClickable()) { 4753 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4754 } 4755 4756 if (isLongClickable()) { 4757 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4758 } 4759 4760 if (mContentDescription != null && mContentDescription.length() > 0) { 4761 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4762 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4763 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4764 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4765 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4766 } 4767 } 4768 4769 /** 4770 * Computes whether this view is visible to the user. Such a view is 4771 * attached, visible, all its predecessors are visible, it is not clipped 4772 * entirely by its predecessors, and has an alpha greater than zero. 4773 * 4774 * @return Whether the view is visible on the screen. 4775 */ 4776 private boolean isVisibleToUser() { 4777 // The first two checks are made also made by isShown() which 4778 // however traverses the tree up to the parent to catch that. 4779 // Therefore, we do some fail fast check to minimize the up 4780 // tree traversal. 4781 return (mAttachInfo != null 4782 && mAttachInfo.mWindowVisibility == View.VISIBLE 4783 && getAlpha() > 0 4784 && isShown() 4785 && getGlobalVisibleRect(mAttachInfo.mTmpInvalRect)); 4786 } 4787 4788 /** 4789 * Sets a delegate for implementing accessibility support via compositon as 4790 * opposed to inheritance. The delegate's primary use is for implementing 4791 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4792 * 4793 * @param delegate The delegate instance. 4794 * 4795 * @see AccessibilityDelegate 4796 */ 4797 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4798 mAccessibilityDelegate = delegate; 4799 } 4800 4801 /** 4802 * Gets the provider for managing a virtual view hierarchy rooted at this View 4803 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4804 * that explore the window content. 4805 * <p> 4806 * If this method returns an instance, this instance is responsible for managing 4807 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4808 * View including the one representing the View itself. Similarly the returned 4809 * instance is responsible for performing accessibility actions on any virtual 4810 * view or the root view itself. 4811 * </p> 4812 * <p> 4813 * If an {@link AccessibilityDelegate} has been specified via calling 4814 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4815 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4816 * is responsible for handling this call. 4817 * </p> 4818 * 4819 * @return The provider. 4820 * 4821 * @see AccessibilityNodeProvider 4822 */ 4823 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4824 if (mAccessibilityDelegate != null) { 4825 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4826 } else { 4827 return null; 4828 } 4829 } 4830 4831 /** 4832 * Gets the unique identifier of this view on the screen for accessibility purposes. 4833 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4834 * 4835 * @return The view accessibility id. 4836 * 4837 * @hide 4838 */ 4839 public int getAccessibilityViewId() { 4840 if (mAccessibilityViewId == NO_ID) { 4841 mAccessibilityViewId = sNextAccessibilityViewId++; 4842 } 4843 return mAccessibilityViewId; 4844 } 4845 4846 /** 4847 * Gets the unique identifier of the window in which this View reseides. 4848 * 4849 * @return The window accessibility id. 4850 * 4851 * @hide 4852 */ 4853 public int getAccessibilityWindowId() { 4854 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4855 } 4856 4857 /** 4858 * Gets the {@link View} description. It briefly describes the view and is 4859 * primarily used for accessibility support. Set this property to enable 4860 * better accessibility support for your application. This is especially 4861 * true for views that do not have textual representation (For example, 4862 * ImageButton). 4863 * 4864 * @return The content description. 4865 * 4866 * @attr ref android.R.styleable#View_contentDescription 4867 */ 4868 @ViewDebug.ExportedProperty(category = "accessibility") 4869 public CharSequence getContentDescription() { 4870 return mContentDescription; 4871 } 4872 4873 /** 4874 * Sets the {@link View} description. It briefly describes the view and is 4875 * primarily used for accessibility support. Set this property to enable 4876 * better accessibility support for your application. This is especially 4877 * true for views that do not have textual representation (For example, 4878 * ImageButton). 4879 * 4880 * @param contentDescription The content description. 4881 * 4882 * @attr ref android.R.styleable#View_contentDescription 4883 */ 4884 @RemotableViewMethod 4885 public void setContentDescription(CharSequence contentDescription) { 4886 mContentDescription = contentDescription; 4887 } 4888 4889 /** 4890 * Invoked whenever this view loses focus, either by losing window focus or by losing 4891 * focus within its window. This method can be used to clear any state tied to the 4892 * focus. For instance, if a button is held pressed with the trackball and the window 4893 * loses focus, this method can be used to cancel the press. 4894 * 4895 * Subclasses of View overriding this method should always call super.onFocusLost(). 4896 * 4897 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4898 * @see #onWindowFocusChanged(boolean) 4899 * 4900 * @hide pending API council approval 4901 */ 4902 protected void onFocusLost() { 4903 resetPressedState(); 4904 } 4905 4906 private void resetPressedState() { 4907 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4908 return; 4909 } 4910 4911 if (isPressed()) { 4912 setPressed(false); 4913 4914 if (!mHasPerformedLongPress) { 4915 removeLongPressCallback(); 4916 } 4917 } 4918 } 4919 4920 /** 4921 * Returns true if this view has focus 4922 * 4923 * @return True if this view has focus, false otherwise. 4924 */ 4925 @ViewDebug.ExportedProperty(category = "focus") 4926 public boolean isFocused() { 4927 return (mPrivateFlags & FOCUSED) != 0; 4928 } 4929 4930 /** 4931 * Find the view in the hierarchy rooted at this view that currently has 4932 * focus. 4933 * 4934 * @return The view that currently has focus, or null if no focused view can 4935 * be found. 4936 */ 4937 public View findFocus() { 4938 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4939 } 4940 4941 /** 4942 * Indicates whether this view is one of the set of scrollable containers in 4943 * its window. 4944 * 4945 * @return whether this view is one of the set of scrollable containers in 4946 * its window 4947 * 4948 * @attr ref android.R.styleable#View_isScrollContainer 4949 */ 4950 public boolean isScrollContainer() { 4951 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4952 } 4953 4954 /** 4955 * Change whether this view is one of the set of scrollable containers in 4956 * its window. This will be used to determine whether the window can 4957 * resize or must pan when a soft input area is open -- scrollable 4958 * containers allow the window to use resize mode since the container 4959 * will appropriately shrink. 4960 * 4961 * @attr ref android.R.styleable#View_isScrollContainer 4962 */ 4963 public void setScrollContainer(boolean isScrollContainer) { 4964 if (isScrollContainer) { 4965 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4966 mAttachInfo.mScrollContainers.add(this); 4967 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4968 } 4969 mPrivateFlags |= SCROLL_CONTAINER; 4970 } else { 4971 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4972 mAttachInfo.mScrollContainers.remove(this); 4973 } 4974 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4975 } 4976 } 4977 4978 /** 4979 * Returns the quality of the drawing cache. 4980 * 4981 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4982 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4983 * 4984 * @see #setDrawingCacheQuality(int) 4985 * @see #setDrawingCacheEnabled(boolean) 4986 * @see #isDrawingCacheEnabled() 4987 * 4988 * @attr ref android.R.styleable#View_drawingCacheQuality 4989 */ 4990 public int getDrawingCacheQuality() { 4991 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4992 } 4993 4994 /** 4995 * Set the drawing cache quality of this view. This value is used only when the 4996 * drawing cache is enabled 4997 * 4998 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4999 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5000 * 5001 * @see #getDrawingCacheQuality() 5002 * @see #setDrawingCacheEnabled(boolean) 5003 * @see #isDrawingCacheEnabled() 5004 * 5005 * @attr ref android.R.styleable#View_drawingCacheQuality 5006 */ 5007 public void setDrawingCacheQuality(int quality) { 5008 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5009 } 5010 5011 /** 5012 * Returns whether the screen should remain on, corresponding to the current 5013 * value of {@link #KEEP_SCREEN_ON}. 5014 * 5015 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5016 * 5017 * @see #setKeepScreenOn(boolean) 5018 * 5019 * @attr ref android.R.styleable#View_keepScreenOn 5020 */ 5021 public boolean getKeepScreenOn() { 5022 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5023 } 5024 5025 /** 5026 * Controls whether the screen should remain on, modifying the 5027 * value of {@link #KEEP_SCREEN_ON}. 5028 * 5029 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5030 * 5031 * @see #getKeepScreenOn() 5032 * 5033 * @attr ref android.R.styleable#View_keepScreenOn 5034 */ 5035 public void setKeepScreenOn(boolean keepScreenOn) { 5036 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5037 } 5038 5039 /** 5040 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5041 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5042 * 5043 * @attr ref android.R.styleable#View_nextFocusLeft 5044 */ 5045 public int getNextFocusLeftId() { 5046 return mNextFocusLeftId; 5047 } 5048 5049 /** 5050 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5051 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5052 * decide automatically. 5053 * 5054 * @attr ref android.R.styleable#View_nextFocusLeft 5055 */ 5056 public void setNextFocusLeftId(int nextFocusLeftId) { 5057 mNextFocusLeftId = nextFocusLeftId; 5058 } 5059 5060 /** 5061 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5062 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5063 * 5064 * @attr ref android.R.styleable#View_nextFocusRight 5065 */ 5066 public int getNextFocusRightId() { 5067 return mNextFocusRightId; 5068 } 5069 5070 /** 5071 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5072 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5073 * decide automatically. 5074 * 5075 * @attr ref android.R.styleable#View_nextFocusRight 5076 */ 5077 public void setNextFocusRightId(int nextFocusRightId) { 5078 mNextFocusRightId = nextFocusRightId; 5079 } 5080 5081 /** 5082 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5083 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5084 * 5085 * @attr ref android.R.styleable#View_nextFocusUp 5086 */ 5087 public int getNextFocusUpId() { 5088 return mNextFocusUpId; 5089 } 5090 5091 /** 5092 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5093 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5094 * decide automatically. 5095 * 5096 * @attr ref android.R.styleable#View_nextFocusUp 5097 */ 5098 public void setNextFocusUpId(int nextFocusUpId) { 5099 mNextFocusUpId = nextFocusUpId; 5100 } 5101 5102 /** 5103 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5104 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5105 * 5106 * @attr ref android.R.styleable#View_nextFocusDown 5107 */ 5108 public int getNextFocusDownId() { 5109 return mNextFocusDownId; 5110 } 5111 5112 /** 5113 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5114 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5115 * decide automatically. 5116 * 5117 * @attr ref android.R.styleable#View_nextFocusDown 5118 */ 5119 public void setNextFocusDownId(int nextFocusDownId) { 5120 mNextFocusDownId = nextFocusDownId; 5121 } 5122 5123 /** 5124 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5125 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5126 * 5127 * @attr ref android.R.styleable#View_nextFocusForward 5128 */ 5129 public int getNextFocusForwardId() { 5130 return mNextFocusForwardId; 5131 } 5132 5133 /** 5134 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5135 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5136 * decide automatically. 5137 * 5138 * @attr ref android.R.styleable#View_nextFocusForward 5139 */ 5140 public void setNextFocusForwardId(int nextFocusForwardId) { 5141 mNextFocusForwardId = nextFocusForwardId; 5142 } 5143 5144 /** 5145 * Returns the visibility of this view and all of its ancestors 5146 * 5147 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5148 */ 5149 public boolean isShown() { 5150 View current = this; 5151 //noinspection ConstantConditions 5152 do { 5153 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5154 return false; 5155 } 5156 ViewParent parent = current.mParent; 5157 if (parent == null) { 5158 return false; // We are not attached to the view root 5159 } 5160 if (!(parent instanceof View)) { 5161 return true; 5162 } 5163 current = (View) parent; 5164 } while (current != null); 5165 5166 return false; 5167 } 5168 5169 /** 5170 * Called by the view hierarchy when the content insets for a window have 5171 * changed, to allow it to adjust its content to fit within those windows. 5172 * The content insets tell you the space that the status bar, input method, 5173 * and other system windows infringe on the application's window. 5174 * 5175 * <p>You do not normally need to deal with this function, since the default 5176 * window decoration given to applications takes care of applying it to the 5177 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5178 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5179 * and your content can be placed under those system elements. You can then 5180 * use this method within your view hierarchy if you have parts of your UI 5181 * which you would like to ensure are not being covered. 5182 * 5183 * <p>The default implementation of this method simply applies the content 5184 * inset's to the view's padding. This can be enabled through 5185 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5186 * the method and handle the insets however you would like. Note that the 5187 * insets provided by the framework are always relative to the far edges 5188 * of the window, not accounting for the location of the called view within 5189 * that window. (In fact when this method is called you do not yet know 5190 * where the layout will place the view, as it is done before layout happens.) 5191 * 5192 * <p>Note: unlike many View methods, there is no dispatch phase to this 5193 * call. If you are overriding it in a ViewGroup and want to allow the 5194 * call to continue to your children, you must be sure to call the super 5195 * implementation. 5196 * 5197 * @param insets Current content insets of the window. Prior to 5198 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5199 * the insets or else you and Android will be unhappy. 5200 * 5201 * @return Return true if this view applied the insets and it should not 5202 * continue propagating further down the hierarchy, false otherwise. 5203 */ 5204 protected boolean fitSystemWindows(Rect insets) { 5205 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5206 mUserPaddingStart = -1; 5207 mUserPaddingEnd = -1; 5208 mUserPaddingRelative = false; 5209 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5210 || mAttachInfo == null 5211 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5212 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5213 return true; 5214 } else { 5215 internalSetPadding(0, 0, 0, 0); 5216 return false; 5217 } 5218 } 5219 return false; 5220 } 5221 5222 /** 5223 * Set whether or not this view should account for system screen decorations 5224 * such as the status bar and inset its content. This allows this view to be 5225 * positioned in absolute screen coordinates and remain visible to the user. 5226 * 5227 * <p>This should only be used by top-level window decor views. 5228 * 5229 * @param fitSystemWindows true to inset content for system screen decorations, false for 5230 * default behavior. 5231 * 5232 * @attr ref android.R.styleable#View_fitsSystemWindows 5233 */ 5234 public void setFitsSystemWindows(boolean fitSystemWindows) { 5235 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5236 } 5237 5238 /** 5239 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 5240 * will account for system screen decorations such as the status bar and inset its 5241 * content. This allows the view to be positioned in absolute screen coordinates 5242 * and remain visible to the user. 5243 * 5244 * @return true if this view will adjust its content bounds for system screen decorations. 5245 * 5246 * @attr ref android.R.styleable#View_fitsSystemWindows 5247 */ 5248 public boolean fitsSystemWindows() { 5249 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5250 } 5251 5252 /** 5253 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5254 */ 5255 public void requestFitSystemWindows() { 5256 if (mParent != null) { 5257 mParent.requestFitSystemWindows(); 5258 } 5259 } 5260 5261 /** 5262 * For use by PhoneWindow to make its own system window fitting optional. 5263 * @hide 5264 */ 5265 public void makeOptionalFitsSystemWindows() { 5266 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5267 } 5268 5269 /** 5270 * Returns the visibility status for this view. 5271 * 5272 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5273 * @attr ref android.R.styleable#View_visibility 5274 */ 5275 @ViewDebug.ExportedProperty(mapping = { 5276 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5277 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5278 @ViewDebug.IntToString(from = GONE, to = "GONE") 5279 }) 5280 public int getVisibility() { 5281 return mViewFlags & VISIBILITY_MASK; 5282 } 5283 5284 /** 5285 * Set the enabled state of this view. 5286 * 5287 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5288 * @attr ref android.R.styleable#View_visibility 5289 */ 5290 @RemotableViewMethod 5291 public void setVisibility(int visibility) { 5292 setFlags(visibility, VISIBILITY_MASK); 5293 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5294 } 5295 5296 /** 5297 * Returns the enabled status for this view. The interpretation of the 5298 * enabled state varies by subclass. 5299 * 5300 * @return True if this view is enabled, false otherwise. 5301 */ 5302 @ViewDebug.ExportedProperty 5303 public boolean isEnabled() { 5304 return (mViewFlags & ENABLED_MASK) == ENABLED; 5305 } 5306 5307 /** 5308 * Set the enabled state of this view. The interpretation of the enabled 5309 * state varies by subclass. 5310 * 5311 * @param enabled True if this view is enabled, false otherwise. 5312 */ 5313 @RemotableViewMethod 5314 public void setEnabled(boolean enabled) { 5315 if (enabled == isEnabled()) return; 5316 5317 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5318 5319 /* 5320 * The View most likely has to change its appearance, so refresh 5321 * the drawable state. 5322 */ 5323 refreshDrawableState(); 5324 5325 // Invalidate too, since the default behavior for views is to be 5326 // be drawn at 50% alpha rather than to change the drawable. 5327 invalidate(true); 5328 } 5329 5330 /** 5331 * Set whether this view can receive the focus. 5332 * 5333 * Setting this to false will also ensure that this view is not focusable 5334 * in touch mode. 5335 * 5336 * @param focusable If true, this view can receive the focus. 5337 * 5338 * @see #setFocusableInTouchMode(boolean) 5339 * @attr ref android.R.styleable#View_focusable 5340 */ 5341 public void setFocusable(boolean focusable) { 5342 if (!focusable) { 5343 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5344 } 5345 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5346 } 5347 5348 /** 5349 * Set whether this view can receive focus while in touch mode. 5350 * 5351 * Setting this to true will also ensure that this view is focusable. 5352 * 5353 * @param focusableInTouchMode If true, this view can receive the focus while 5354 * in touch mode. 5355 * 5356 * @see #setFocusable(boolean) 5357 * @attr ref android.R.styleable#View_focusableInTouchMode 5358 */ 5359 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5360 // Focusable in touch mode should always be set before the focusable flag 5361 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5362 // which, in touch mode, will not successfully request focus on this view 5363 // because the focusable in touch mode flag is not set 5364 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5365 if (focusableInTouchMode) { 5366 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5367 } 5368 } 5369 5370 /** 5371 * Set whether this view should have sound effects enabled for events such as 5372 * clicking and touching. 5373 * 5374 * <p>You may wish to disable sound effects for a view if you already play sounds, 5375 * for instance, a dial key that plays dtmf tones. 5376 * 5377 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5378 * @see #isSoundEffectsEnabled() 5379 * @see #playSoundEffect(int) 5380 * @attr ref android.R.styleable#View_soundEffectsEnabled 5381 */ 5382 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5383 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5384 } 5385 5386 /** 5387 * @return whether this view should have sound effects enabled for events such as 5388 * clicking and touching. 5389 * 5390 * @see #setSoundEffectsEnabled(boolean) 5391 * @see #playSoundEffect(int) 5392 * @attr ref android.R.styleable#View_soundEffectsEnabled 5393 */ 5394 @ViewDebug.ExportedProperty 5395 public boolean isSoundEffectsEnabled() { 5396 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5397 } 5398 5399 /** 5400 * Set whether this view should have haptic feedback for events such as 5401 * long presses. 5402 * 5403 * <p>You may wish to disable haptic feedback if your view already controls 5404 * its own haptic feedback. 5405 * 5406 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5407 * @see #isHapticFeedbackEnabled() 5408 * @see #performHapticFeedback(int) 5409 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5410 */ 5411 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5412 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5413 } 5414 5415 /** 5416 * @return whether this view should have haptic feedback enabled for events 5417 * long presses. 5418 * 5419 * @see #setHapticFeedbackEnabled(boolean) 5420 * @see #performHapticFeedback(int) 5421 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5422 */ 5423 @ViewDebug.ExportedProperty 5424 public boolean isHapticFeedbackEnabled() { 5425 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5426 } 5427 5428 /** 5429 * Returns the layout direction for this view. 5430 * 5431 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5432 * {@link #LAYOUT_DIRECTION_RTL}, 5433 * {@link #LAYOUT_DIRECTION_INHERIT} or 5434 * {@link #LAYOUT_DIRECTION_LOCALE}. 5435 * @attr ref android.R.styleable#View_layoutDirection 5436 */ 5437 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5438 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5439 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5440 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5441 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5442 }) 5443 public int getLayoutDirection() { 5444 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5445 } 5446 5447 /** 5448 * Set the layout direction for this view. This will propagate a reset of layout direction 5449 * resolution to the view's children and resolve layout direction for this view. 5450 * 5451 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5452 * {@link #LAYOUT_DIRECTION_RTL}, 5453 * {@link #LAYOUT_DIRECTION_INHERIT} or 5454 * {@link #LAYOUT_DIRECTION_LOCALE}. 5455 * 5456 * @attr ref android.R.styleable#View_layoutDirection 5457 */ 5458 @RemotableViewMethod 5459 public void setLayoutDirection(int layoutDirection) { 5460 if (getLayoutDirection() != layoutDirection) { 5461 // Reset the current layout direction and the resolved one 5462 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5463 resetResolvedLayoutDirection(); 5464 // Set the new layout direction (filtered) and ask for a layout pass 5465 mPrivateFlags2 |= 5466 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5467 requestLayout(); 5468 } 5469 } 5470 5471 /** 5472 * Returns the resolved layout direction for this view. 5473 * 5474 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5475 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5476 */ 5477 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5478 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5479 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5480 }) 5481 public int getResolvedLayoutDirection() { 5482 // The layout diretion will be resolved only if needed 5483 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5484 resolveLayoutDirection(); 5485 } 5486 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5487 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5488 } 5489 5490 /** 5491 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5492 * layout attribute and/or the inherited value from the parent 5493 * 5494 * @return true if the layout is right-to-left. 5495 */ 5496 @ViewDebug.ExportedProperty(category = "layout") 5497 public boolean isLayoutRtl() { 5498 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5499 } 5500 5501 /** 5502 * Indicates whether the view is currently tracking transient state that the 5503 * app should not need to concern itself with saving and restoring, but that 5504 * the framework should take special note to preserve when possible. 5505 * 5506 * <p>A view with transient state cannot be trivially rebound from an external 5507 * data source, such as an adapter binding item views in a list. This may be 5508 * because the view is performing an animation, tracking user selection 5509 * of content, or similar.</p> 5510 * 5511 * @return true if the view has transient state 5512 */ 5513 @ViewDebug.ExportedProperty(category = "layout") 5514 public boolean hasTransientState() { 5515 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5516 } 5517 5518 /** 5519 * Set whether this view is currently tracking transient state that the 5520 * framework should attempt to preserve when possible. This flag is reference counted, 5521 * so every call to setHasTransientState(true) should be paired with a later call 5522 * to setHasTransientState(false). 5523 * 5524 * <p>A view with transient state cannot be trivially rebound from an external 5525 * data source, such as an adapter binding item views in a list. This may be 5526 * because the view is performing an animation, tracking user selection 5527 * of content, or similar.</p> 5528 * 5529 * @param hasTransientState true if this view has transient state 5530 */ 5531 public void setHasTransientState(boolean hasTransientState) { 5532 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5533 mTransientStateCount - 1; 5534 if (mTransientStateCount < 0) { 5535 mTransientStateCount = 0; 5536 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5537 "unmatched pair of setHasTransientState calls"); 5538 } 5539 if ((hasTransientState && mTransientStateCount == 1) || 5540 (hasTransientState && mTransientStateCount == 0)) { 5541 // update flag if we've just incremented up from 0 or decremented down to 0 5542 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5543 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5544 if (mParent != null) { 5545 try { 5546 mParent.childHasTransientStateChanged(this, hasTransientState); 5547 } catch (AbstractMethodError e) { 5548 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5549 " does not fully implement ViewParent", e); 5550 } 5551 } 5552 } 5553 } 5554 5555 /** 5556 * If this view doesn't do any drawing on its own, set this flag to 5557 * allow further optimizations. By default, this flag is not set on 5558 * View, but could be set on some View subclasses such as ViewGroup. 5559 * 5560 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5561 * you should clear this flag. 5562 * 5563 * @param willNotDraw whether or not this View draw on its own 5564 */ 5565 public void setWillNotDraw(boolean willNotDraw) { 5566 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5567 } 5568 5569 /** 5570 * Returns whether or not this View draws on its own. 5571 * 5572 * @return true if this view has nothing to draw, false otherwise 5573 */ 5574 @ViewDebug.ExportedProperty(category = "drawing") 5575 public boolean willNotDraw() { 5576 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5577 } 5578 5579 /** 5580 * When a View's drawing cache is enabled, drawing is redirected to an 5581 * offscreen bitmap. Some views, like an ImageView, must be able to 5582 * bypass this mechanism if they already draw a single bitmap, to avoid 5583 * unnecessary usage of the memory. 5584 * 5585 * @param willNotCacheDrawing true if this view does not cache its 5586 * drawing, false otherwise 5587 */ 5588 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5589 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5590 } 5591 5592 /** 5593 * Returns whether or not this View can cache its drawing or not. 5594 * 5595 * @return true if this view does not cache its drawing, false otherwise 5596 */ 5597 @ViewDebug.ExportedProperty(category = "drawing") 5598 public boolean willNotCacheDrawing() { 5599 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5600 } 5601 5602 /** 5603 * Indicates whether this view reacts to click events or not. 5604 * 5605 * @return true if the view is clickable, false otherwise 5606 * 5607 * @see #setClickable(boolean) 5608 * @attr ref android.R.styleable#View_clickable 5609 */ 5610 @ViewDebug.ExportedProperty 5611 public boolean isClickable() { 5612 return (mViewFlags & CLICKABLE) == CLICKABLE; 5613 } 5614 5615 /** 5616 * Enables or disables click events for this view. When a view 5617 * is clickable it will change its state to "pressed" on every click. 5618 * Subclasses should set the view clickable to visually react to 5619 * user's clicks. 5620 * 5621 * @param clickable true to make the view clickable, false otherwise 5622 * 5623 * @see #isClickable() 5624 * @attr ref android.R.styleable#View_clickable 5625 */ 5626 public void setClickable(boolean clickable) { 5627 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5628 } 5629 5630 /** 5631 * Indicates whether this view reacts to long click events or not. 5632 * 5633 * @return true if the view is long clickable, false otherwise 5634 * 5635 * @see #setLongClickable(boolean) 5636 * @attr ref android.R.styleable#View_longClickable 5637 */ 5638 public boolean isLongClickable() { 5639 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5640 } 5641 5642 /** 5643 * Enables or disables long click events for this view. When a view is long 5644 * clickable it reacts to the user holding down the button for a longer 5645 * duration than a tap. This event can either launch the listener or a 5646 * context menu. 5647 * 5648 * @param longClickable true to make the view long clickable, false otherwise 5649 * @see #isLongClickable() 5650 * @attr ref android.R.styleable#View_longClickable 5651 */ 5652 public void setLongClickable(boolean longClickable) { 5653 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5654 } 5655 5656 /** 5657 * Sets the pressed state for this view. 5658 * 5659 * @see #isClickable() 5660 * @see #setClickable(boolean) 5661 * 5662 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5663 * the View's internal state from a previously set "pressed" state. 5664 */ 5665 public void setPressed(boolean pressed) { 5666 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5667 5668 if (pressed) { 5669 mPrivateFlags |= PRESSED; 5670 } else { 5671 mPrivateFlags &= ~PRESSED; 5672 } 5673 5674 if (needsRefresh) { 5675 refreshDrawableState(); 5676 } 5677 dispatchSetPressed(pressed); 5678 } 5679 5680 /** 5681 * Dispatch setPressed to all of this View's children. 5682 * 5683 * @see #setPressed(boolean) 5684 * 5685 * @param pressed The new pressed state 5686 */ 5687 protected void dispatchSetPressed(boolean pressed) { 5688 } 5689 5690 /** 5691 * Indicates whether the view is currently in pressed state. Unless 5692 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5693 * the pressed state. 5694 * 5695 * @see #setPressed(boolean) 5696 * @see #isClickable() 5697 * @see #setClickable(boolean) 5698 * 5699 * @return true if the view is currently pressed, false otherwise 5700 */ 5701 public boolean isPressed() { 5702 return (mPrivateFlags & PRESSED) == PRESSED; 5703 } 5704 5705 /** 5706 * Indicates whether this view will save its state (that is, 5707 * whether its {@link #onSaveInstanceState} method will be called). 5708 * 5709 * @return Returns true if the view state saving is enabled, else false. 5710 * 5711 * @see #setSaveEnabled(boolean) 5712 * @attr ref android.R.styleable#View_saveEnabled 5713 */ 5714 public boolean isSaveEnabled() { 5715 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5716 } 5717 5718 /** 5719 * Controls whether the saving of this view's state is 5720 * enabled (that is, whether its {@link #onSaveInstanceState} method 5721 * will be called). Note that even if freezing is enabled, the 5722 * view still must have an id assigned to it (via {@link #setId(int)}) 5723 * for its state to be saved. This flag can only disable the 5724 * saving of this view; any child views may still have their state saved. 5725 * 5726 * @param enabled Set to false to <em>disable</em> state saving, or true 5727 * (the default) to allow it. 5728 * 5729 * @see #isSaveEnabled() 5730 * @see #setId(int) 5731 * @see #onSaveInstanceState() 5732 * @attr ref android.R.styleable#View_saveEnabled 5733 */ 5734 public void setSaveEnabled(boolean enabled) { 5735 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5736 } 5737 5738 /** 5739 * Gets whether the framework should discard touches when the view's 5740 * window is obscured by another visible window. 5741 * Refer to the {@link View} security documentation for more details. 5742 * 5743 * @return True if touch filtering is enabled. 5744 * 5745 * @see #setFilterTouchesWhenObscured(boolean) 5746 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5747 */ 5748 @ViewDebug.ExportedProperty 5749 public boolean getFilterTouchesWhenObscured() { 5750 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5751 } 5752 5753 /** 5754 * Sets whether the framework should discard touches when the view's 5755 * window is obscured by another visible window. 5756 * Refer to the {@link View} security documentation for more details. 5757 * 5758 * @param enabled True if touch filtering should be enabled. 5759 * 5760 * @see #getFilterTouchesWhenObscured 5761 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5762 */ 5763 public void setFilterTouchesWhenObscured(boolean enabled) { 5764 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5765 FILTER_TOUCHES_WHEN_OBSCURED); 5766 } 5767 5768 /** 5769 * Indicates whether the entire hierarchy under this view will save its 5770 * state when a state saving traversal occurs from its parent. The default 5771 * is true; if false, these views will not be saved unless 5772 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5773 * 5774 * @return Returns true if the view state saving from parent is enabled, else false. 5775 * 5776 * @see #setSaveFromParentEnabled(boolean) 5777 */ 5778 public boolean isSaveFromParentEnabled() { 5779 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5780 } 5781 5782 /** 5783 * Controls whether the entire hierarchy under this view will save its 5784 * state when a state saving traversal occurs from its parent. The default 5785 * is true; if false, these views will not be saved unless 5786 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5787 * 5788 * @param enabled Set to false to <em>disable</em> state saving, or true 5789 * (the default) to allow it. 5790 * 5791 * @see #isSaveFromParentEnabled() 5792 * @see #setId(int) 5793 * @see #onSaveInstanceState() 5794 */ 5795 public void setSaveFromParentEnabled(boolean enabled) { 5796 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5797 } 5798 5799 5800 /** 5801 * Returns whether this View is able to take focus. 5802 * 5803 * @return True if this view can take focus, or false otherwise. 5804 * @attr ref android.R.styleable#View_focusable 5805 */ 5806 @ViewDebug.ExportedProperty(category = "focus") 5807 public final boolean isFocusable() { 5808 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5809 } 5810 5811 /** 5812 * When a view is focusable, it may not want to take focus when in touch mode. 5813 * For example, a button would like focus when the user is navigating via a D-pad 5814 * so that the user can click on it, but once the user starts touching the screen, 5815 * the button shouldn't take focus 5816 * @return Whether the view is focusable in touch mode. 5817 * @attr ref android.R.styleable#View_focusableInTouchMode 5818 */ 5819 @ViewDebug.ExportedProperty 5820 public final boolean isFocusableInTouchMode() { 5821 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5822 } 5823 5824 /** 5825 * Find the nearest view in the specified direction that can take focus. 5826 * This does not actually give focus to that view. 5827 * 5828 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5829 * 5830 * @return The nearest focusable in the specified direction, or null if none 5831 * can be found. 5832 */ 5833 public View focusSearch(int direction) { 5834 if (mParent != null) { 5835 return mParent.focusSearch(this, direction); 5836 } else { 5837 return null; 5838 } 5839 } 5840 5841 /** 5842 * This method is the last chance for the focused view and its ancestors to 5843 * respond to an arrow key. This is called when the focused view did not 5844 * consume the key internally, nor could the view system find a new view in 5845 * the requested direction to give focus to. 5846 * 5847 * @param focused The currently focused view. 5848 * @param direction The direction focus wants to move. One of FOCUS_UP, 5849 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5850 * @return True if the this view consumed this unhandled move. 5851 */ 5852 public boolean dispatchUnhandledMove(View focused, int direction) { 5853 return false; 5854 } 5855 5856 /** 5857 * If a user manually specified the next view id for a particular direction, 5858 * use the root to look up the view. 5859 * @param root The root view of the hierarchy containing this view. 5860 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5861 * or FOCUS_BACKWARD. 5862 * @return The user specified next view, or null if there is none. 5863 */ 5864 View findUserSetNextFocus(View root, int direction) { 5865 switch (direction) { 5866 case FOCUS_LEFT: 5867 if (mNextFocusLeftId == View.NO_ID) return null; 5868 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5869 case FOCUS_RIGHT: 5870 if (mNextFocusRightId == View.NO_ID) return null; 5871 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5872 case FOCUS_UP: 5873 if (mNextFocusUpId == View.NO_ID) return null; 5874 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5875 case FOCUS_DOWN: 5876 if (mNextFocusDownId == View.NO_ID) return null; 5877 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5878 case FOCUS_FORWARD: 5879 if (mNextFocusForwardId == View.NO_ID) return null; 5880 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5881 case FOCUS_BACKWARD: { 5882 if (mID == View.NO_ID) return null; 5883 final int id = mID; 5884 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5885 @Override 5886 public boolean apply(View t) { 5887 return t.mNextFocusForwardId == id; 5888 } 5889 }); 5890 } 5891 } 5892 return null; 5893 } 5894 5895 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5896 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5897 @Override 5898 public boolean apply(View t) { 5899 return t.mID == childViewId; 5900 } 5901 }); 5902 5903 if (result == null) { 5904 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5905 + "by user for id " + childViewId); 5906 } 5907 return result; 5908 } 5909 5910 /** 5911 * Find and return all focusable views that are descendants of this view, 5912 * possibly including this view if it is focusable itself. 5913 * 5914 * @param direction The direction of the focus 5915 * @return A list of focusable views 5916 */ 5917 public ArrayList<View> getFocusables(int direction) { 5918 ArrayList<View> result = new ArrayList<View>(24); 5919 addFocusables(result, direction); 5920 return result; 5921 } 5922 5923 /** 5924 * Add any focusable views that are descendants of this view (possibly 5925 * including this view if it is focusable itself) to views. If we are in touch mode, 5926 * only add views that are also focusable in touch mode. 5927 * 5928 * @param views Focusable views found so far 5929 * @param direction The direction of the focus 5930 */ 5931 public void addFocusables(ArrayList<View> views, int direction) { 5932 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5933 } 5934 5935 /** 5936 * Adds any focusable views that are descendants of this view (possibly 5937 * including this view if it is focusable itself) to views. This method 5938 * adds all focusable views regardless if we are in touch mode or 5939 * only views focusable in touch mode if we are in touch mode or 5940 * only views that can take accessibility focus if accessibility is enabeld 5941 * depending on the focusable mode paramater. 5942 * 5943 * @param views Focusable views found so far or null if all we are interested is 5944 * the number of focusables. 5945 * @param direction The direction of the focus. 5946 * @param focusableMode The type of focusables to be added. 5947 * 5948 * @see #FOCUSABLES_ALL 5949 * @see #FOCUSABLES_TOUCH_MODE 5950 */ 5951 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5952 if (views == null) { 5953 return; 5954 } 5955 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 5956 if (AccessibilityManager.getInstance(mContext).isEnabled() 5957 && includeForAccessibility()) { 5958 views.add(this); 5959 return; 5960 } 5961 } 5962 if (!isFocusable()) { 5963 return; 5964 } 5965 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 5966 && isInTouchMode() && !isFocusableInTouchMode()) { 5967 return; 5968 } 5969 views.add(this); 5970 } 5971 5972 /** 5973 * Finds the Views that contain given text. The containment is case insensitive. 5974 * The search is performed by either the text that the View renders or the content 5975 * description that describes the view for accessibility purposes and the view does 5976 * not render or both. Clients can specify how the search is to be performed via 5977 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5978 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5979 * 5980 * @param outViews The output list of matching Views. 5981 * @param searched The text to match against. 5982 * 5983 * @see #FIND_VIEWS_WITH_TEXT 5984 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5985 * @see #setContentDescription(CharSequence) 5986 */ 5987 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5988 if (getAccessibilityNodeProvider() != null) { 5989 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5990 outViews.add(this); 5991 } 5992 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5993 && (searched != null && searched.length() > 0) 5994 && (mContentDescription != null && mContentDescription.length() > 0)) { 5995 String searchedLowerCase = searched.toString().toLowerCase(); 5996 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5997 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5998 outViews.add(this); 5999 } 6000 } 6001 } 6002 6003 /** 6004 * Find and return all touchable views that are descendants of this view, 6005 * possibly including this view if it is touchable itself. 6006 * 6007 * @return A list of touchable views 6008 */ 6009 public ArrayList<View> getTouchables() { 6010 ArrayList<View> result = new ArrayList<View>(); 6011 addTouchables(result); 6012 return result; 6013 } 6014 6015 /** 6016 * Add any touchable views that are descendants of this view (possibly 6017 * including this view if it is touchable itself) to views. 6018 * 6019 * @param views Touchable views found so far 6020 */ 6021 public void addTouchables(ArrayList<View> views) { 6022 final int viewFlags = mViewFlags; 6023 6024 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6025 && (viewFlags & ENABLED_MASK) == ENABLED) { 6026 views.add(this); 6027 } 6028 } 6029 6030 /** 6031 * Returns whether this View is accessibility focused. 6032 * 6033 * @return True if this View is accessibility focused. 6034 */ 6035 boolean isAccessibilityFocused() { 6036 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6037 } 6038 6039 /** 6040 * Call this to try to give accessibility focus to this view. 6041 * 6042 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6043 * returns false or the view is no visible or the view already has accessibility 6044 * focus. 6045 * 6046 * See also {@link #focusSearch(int)}, which is what you call to say that you 6047 * have focus, and you want your parent to look for the next one. 6048 * 6049 * @return Whether this view actually took accessibility focus. 6050 * 6051 * @hide 6052 */ 6053 public boolean requestAccessibilityFocus() { 6054 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6055 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6056 return false; 6057 } 6058 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6059 return false; 6060 } 6061 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6062 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6063 ViewRootImpl viewRootImpl = getViewRootImpl(); 6064 if (viewRootImpl != null) { 6065 viewRootImpl.setAccessibilityFocusedHost(this); 6066 } 6067 invalidate(); 6068 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6069 notifyAccessibilityStateChanged(); 6070 // Try to give input focus to this view - not a descendant. 6071 requestFocusNoSearch(View.FOCUS_DOWN, null); 6072 return true; 6073 } 6074 return false; 6075 } 6076 6077 /** 6078 * Call this to try to clear accessibility focus of this view. 6079 * 6080 * See also {@link #focusSearch(int)}, which is what you call to say that you 6081 * have focus, and you want your parent to look for the next one. 6082 * 6083 * @hide 6084 */ 6085 public void clearAccessibilityFocus() { 6086 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6087 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6088 ViewRootImpl viewRootImpl = getViewRootImpl(); 6089 if (viewRootImpl != null) { 6090 viewRootImpl.setAccessibilityFocusedHost(null); 6091 } 6092 invalidate(); 6093 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6094 notifyAccessibilityStateChanged(); 6095 6096 // Clear the text navigation state. 6097 setAccessibilityCursorPosition(-1); 6098 6099 // Try to move accessibility focus to the input focus. 6100 View rootView = getRootView(); 6101 if (rootView != null) { 6102 View inputFocus = rootView.findFocus(); 6103 if (inputFocus != null) { 6104 inputFocus.requestAccessibilityFocus(); 6105 } 6106 } 6107 } 6108 } 6109 6110 /** 6111 * Find the best view to take accessibility focus from a hover. 6112 * This function finds the deepest actionable view and if that 6113 * fails ask the parent to take accessibility focus from hover. 6114 * 6115 * @param x The X hovered location in this view coorditantes. 6116 * @param y The Y hovered location in this view coorditantes. 6117 * @return Whether the request was handled. 6118 * 6119 * @hide 6120 */ 6121 public boolean requestAccessibilityFocusFromHover(float x, float y) { 6122 if (onRequestAccessibilityFocusFromHover(x, y)) { 6123 return true; 6124 } 6125 ViewParent parent = mParent; 6126 if (parent instanceof View) { 6127 View parentView = (View) parent; 6128 6129 float[] position = mAttachInfo.mTmpTransformLocation; 6130 position[0] = x; 6131 position[1] = y; 6132 6133 // Compensate for the transformation of the current matrix. 6134 if (!hasIdentityMatrix()) { 6135 getMatrix().mapPoints(position); 6136 } 6137 6138 // Compensate for the parent scroll and the offset 6139 // of this view stop from the parent top. 6140 position[0] += mLeft - parentView.mScrollX; 6141 position[1] += mTop - parentView.mScrollY; 6142 6143 return parentView.requestAccessibilityFocusFromHover(position[0], position[1]); 6144 } 6145 return false; 6146 } 6147 6148 /** 6149 * Requests to give this View focus from hover. 6150 * 6151 * @param x The X hovered location in this view coorditantes. 6152 * @param y The Y hovered location in this view coorditantes. 6153 * @return Whether the request was handled. 6154 * 6155 * @hide 6156 */ 6157 public boolean onRequestAccessibilityFocusFromHover(float x, float y) { 6158 if (includeForAccessibility() 6159 && (isActionableForAccessibility() || hasListenersForAccessibility())) { 6160 return requestAccessibilityFocus(); 6161 } 6162 return false; 6163 } 6164 6165 /** 6166 * Clears accessibility focus without calling any callback methods 6167 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6168 * is used for clearing accessibility focus when giving this focus to 6169 * another view. 6170 */ 6171 void clearAccessibilityFocusNoCallbacks() { 6172 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6173 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6174 invalidate(); 6175 } 6176 } 6177 6178 /** 6179 * Call this to try to give focus to a specific view or to one of its 6180 * descendants. 6181 * 6182 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6183 * false), or if it is focusable and it is not focusable in touch mode 6184 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6185 * 6186 * See also {@link #focusSearch(int)}, which is what you call to say that you 6187 * have focus, and you want your parent to look for the next one. 6188 * 6189 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6190 * {@link #FOCUS_DOWN} and <code>null</code>. 6191 * 6192 * @return Whether this view or one of its descendants actually took focus. 6193 */ 6194 public final boolean requestFocus() { 6195 return requestFocus(View.FOCUS_DOWN); 6196 } 6197 6198 /** 6199 * Call this to try to give focus to a specific view or to one of its 6200 * descendants and give it a hint about what direction focus is heading. 6201 * 6202 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6203 * false), or if it is focusable and it is not focusable in touch mode 6204 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6205 * 6206 * See also {@link #focusSearch(int)}, which is what you call to say that you 6207 * have focus, and you want your parent to look for the next one. 6208 * 6209 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6210 * <code>null</code> set for the previously focused rectangle. 6211 * 6212 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6213 * @return Whether this view or one of its descendants actually took focus. 6214 */ 6215 public final boolean requestFocus(int direction) { 6216 return requestFocus(direction, null); 6217 } 6218 6219 /** 6220 * Call this to try to give focus to a specific view or to one of its descendants 6221 * and give it hints about the direction and a specific rectangle that the focus 6222 * is coming from. The rectangle can help give larger views a finer grained hint 6223 * about where focus is coming from, and therefore, where to show selection, or 6224 * forward focus change internally. 6225 * 6226 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6227 * false), or if it is focusable and it is not focusable in touch mode 6228 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6229 * 6230 * A View will not take focus if it is not visible. 6231 * 6232 * A View will not take focus if one of its parents has 6233 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6234 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6235 * 6236 * See also {@link #focusSearch(int)}, which is what you call to say that you 6237 * have focus, and you want your parent to look for the next one. 6238 * 6239 * You may wish to override this method if your custom {@link View} has an internal 6240 * {@link View} that it wishes to forward the request to. 6241 * 6242 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6243 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6244 * to give a finer grained hint about where focus is coming from. May be null 6245 * if there is no hint. 6246 * @return Whether this view or one of its descendants actually took focus. 6247 */ 6248 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6249 return requestFocusNoSearch(direction, previouslyFocusedRect); 6250 } 6251 6252 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6253 // need to be focusable 6254 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6255 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6256 return false; 6257 } 6258 6259 // need to be focusable in touch mode if in touch mode 6260 if (isInTouchMode() && 6261 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6262 return false; 6263 } 6264 6265 // need to not have any parents blocking us 6266 if (hasAncestorThatBlocksDescendantFocus()) { 6267 return false; 6268 } 6269 6270 handleFocusGainInternal(direction, previouslyFocusedRect); 6271 return true; 6272 } 6273 6274 /** 6275 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6276 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6277 * touch mode to request focus when they are touched. 6278 * 6279 * @return Whether this view or one of its descendants actually took focus. 6280 * 6281 * @see #isInTouchMode() 6282 * 6283 */ 6284 public final boolean requestFocusFromTouch() { 6285 // Leave touch mode if we need to 6286 if (isInTouchMode()) { 6287 ViewRootImpl viewRoot = getViewRootImpl(); 6288 if (viewRoot != null) { 6289 viewRoot.ensureTouchMode(false); 6290 } 6291 } 6292 return requestFocus(View.FOCUS_DOWN); 6293 } 6294 6295 /** 6296 * @return Whether any ancestor of this view blocks descendant focus. 6297 */ 6298 private boolean hasAncestorThatBlocksDescendantFocus() { 6299 ViewParent ancestor = mParent; 6300 while (ancestor instanceof ViewGroup) { 6301 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6302 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6303 return true; 6304 } else { 6305 ancestor = vgAncestor.getParent(); 6306 } 6307 } 6308 return false; 6309 } 6310 6311 /** 6312 * Gets the mode for determining whether this View is important for accessibility 6313 * which is if it fires accessibility events and if it is reported to 6314 * accessibility services that query the screen. 6315 * 6316 * @return The mode for determining whether a View is important for accessibility. 6317 * 6318 * @attr ref android.R.styleable#View_importantForAccessibility 6319 * 6320 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6321 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6322 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6323 */ 6324 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6325 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6326 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6327 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6328 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6329 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6330 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6331 }) 6332 public int getImportantForAccessibility() { 6333 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6334 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6335 } 6336 6337 /** 6338 * Sets how to determine whether this view is important for accessibility 6339 * which is if it fires accessibility events and if it is reported to 6340 * accessibility services that query the screen. 6341 * 6342 * @param mode How to determine whether this view is important for accessibility. 6343 * 6344 * @attr ref android.R.styleable#View_importantForAccessibility 6345 * 6346 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6347 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6348 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6349 */ 6350 public void setImportantForAccessibility(int mode) { 6351 if (mode != getImportantForAccessibility()) { 6352 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6353 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6354 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6355 notifyAccessibilityStateChanged(); 6356 } 6357 } 6358 6359 /** 6360 * Gets whether this view should be exposed for accessibility. 6361 * 6362 * @return Whether the view is exposed for accessibility. 6363 * 6364 * @hide 6365 */ 6366 public boolean isImportantForAccessibility() { 6367 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6368 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6369 switch (mode) { 6370 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6371 return true; 6372 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6373 return false; 6374 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6375 return isActionableForAccessibility() || hasListenersForAccessibility(); 6376 default: 6377 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6378 + mode); 6379 } 6380 } 6381 6382 /** 6383 * Gets the parent for accessibility purposes. Note that the parent for 6384 * accessibility is not necessary the immediate parent. It is the first 6385 * predecessor that is important for accessibility. 6386 * 6387 * @return The parent for accessibility purposes. 6388 */ 6389 public ViewParent getParentForAccessibility() { 6390 if (mParent instanceof View) { 6391 View parentView = (View) mParent; 6392 if (parentView.includeForAccessibility()) { 6393 return mParent; 6394 } else { 6395 return mParent.getParentForAccessibility(); 6396 } 6397 } 6398 return null; 6399 } 6400 6401 /** 6402 * Adds the children of a given View for accessibility. Since some Views are 6403 * not important for accessibility the children for accessibility are not 6404 * necessarily direct children of the riew, rather they are the first level of 6405 * descendants important for accessibility. 6406 * 6407 * @param children The list of children for accessibility. 6408 */ 6409 public void addChildrenForAccessibility(ArrayList<View> children) { 6410 if (includeForAccessibility()) { 6411 children.add(this); 6412 } 6413 } 6414 6415 /** 6416 * Whether to regard this view for accessibility. A view is regarded for 6417 * accessibility if it is important for accessibility or the querying 6418 * accessibility service has explicitly requested that view not 6419 * important for accessibility are regarded. 6420 * 6421 * @return Whether to regard the view for accessibility. 6422 */ 6423 boolean includeForAccessibility() { 6424 if (mAttachInfo != null) { 6425 if (!mAttachInfo.mIncludeNotImportantViews) { 6426 return isImportantForAccessibility(); 6427 } else { 6428 return true; 6429 } 6430 } 6431 return false; 6432 } 6433 6434 /** 6435 * Returns whether the View is considered actionable from 6436 * accessibility perspective. Such view are important for 6437 * accessiiblity. 6438 * 6439 * @return True if the view is actionable for accessibility. 6440 */ 6441 private boolean isActionableForAccessibility() { 6442 return (isClickable() || isLongClickable() || isFocusable()); 6443 } 6444 6445 /** 6446 * Returns whether the View has registered callbacks wich makes it 6447 * important for accessiiblity. 6448 * 6449 * @return True if the view is actionable for accessibility. 6450 */ 6451 private boolean hasListenersForAccessibility() { 6452 ListenerInfo info = getListenerInfo(); 6453 return mTouchDelegate != null || info.mOnKeyListener != null 6454 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6455 || info.mOnHoverListener != null || info.mOnDragListener != null; 6456 } 6457 6458 /** 6459 * Notifies accessibility services that some view's important for 6460 * accessibility state has changed. Note that such notifications 6461 * are made at most once every 6462 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6463 * to avoid unnecessary load to the system. Also once a view has 6464 * made a notifucation this method is a NOP until the notification has 6465 * been sent to clients. 6466 * 6467 * @hide 6468 * 6469 * TODO: Makse sure this method is called for any view state change 6470 * that is interesting for accessilility purposes. 6471 */ 6472 public void notifyAccessibilityStateChanged() { 6473 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6474 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6475 if (mParent != null) { 6476 mParent.childAccessibilityStateChanged(this); 6477 } 6478 } 6479 } 6480 6481 /** 6482 * Reset the state indicating the this view has requested clients 6483 * interested in its accessiblity state to be notified. 6484 * 6485 * @hide 6486 */ 6487 public void resetAccessibilityStateChanged() { 6488 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6489 } 6490 6491 /** 6492 * Performs the specified accessibility action on the view. For 6493 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6494 * <p> 6495 * If an {@link AccessibilityDelegate} has been specified via calling 6496 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6497 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6498 * is responsible for handling this call. 6499 * </p> 6500 * 6501 * @param action The action to perform. 6502 * @param arguments Optional action arguments. 6503 * @return Whether the action was performed. 6504 */ 6505 public boolean performAccessibilityAction(int action, Bundle arguments) { 6506 if (mAccessibilityDelegate != null) { 6507 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6508 } else { 6509 return performAccessibilityActionInternal(action, arguments); 6510 } 6511 } 6512 6513 /** 6514 * @see #performAccessibilityAction(int, Bundle) 6515 * 6516 * Note: Called from the default {@link AccessibilityDelegate}. 6517 */ 6518 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6519 switch (action) { 6520 case AccessibilityNodeInfo.ACTION_CLICK: { 6521 if (isClickable()) { 6522 return performClick(); 6523 } 6524 } break; 6525 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6526 if (isLongClickable()) { 6527 return performLongClick(); 6528 } 6529 } break; 6530 case AccessibilityNodeInfo.ACTION_FOCUS: { 6531 if (!hasFocus()) { 6532 // Get out of touch mode since accessibility 6533 // wants to move focus around. 6534 getViewRootImpl().ensureTouchMode(false); 6535 return requestFocus(); 6536 } 6537 } break; 6538 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6539 if (hasFocus()) { 6540 clearFocus(); 6541 return !isFocused(); 6542 } 6543 } break; 6544 case AccessibilityNodeInfo.ACTION_SELECT: { 6545 if (!isSelected()) { 6546 setSelected(true); 6547 return isSelected(); 6548 } 6549 } break; 6550 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6551 if (isSelected()) { 6552 setSelected(false); 6553 return !isSelected(); 6554 } 6555 } break; 6556 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6557 if (!isAccessibilityFocused()) { 6558 return requestAccessibilityFocus(); 6559 } 6560 } break; 6561 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6562 if (isAccessibilityFocused()) { 6563 clearAccessibilityFocus(); 6564 return true; 6565 } 6566 } break; 6567 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6568 if (arguments != null) { 6569 final int granularity = arguments.getInt( 6570 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6571 return nextAtGranularity(granularity); 6572 } 6573 } break; 6574 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6575 if (arguments != null) { 6576 final int granularity = arguments.getInt( 6577 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6578 return previousAtGranularity(granularity); 6579 } 6580 } break; 6581 } 6582 return false; 6583 } 6584 6585 private boolean nextAtGranularity(int granularity) { 6586 CharSequence text = getIterableTextForAccessibility(); 6587 if (text != null && text.length() > 0) { 6588 return false; 6589 } 6590 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6591 if (iterator == null) { 6592 return false; 6593 } 6594 final int current = getAccessibilityCursorPosition(); 6595 final int[] range = iterator.following(current); 6596 if (range == null) { 6597 setAccessibilityCursorPosition(-1); 6598 return false; 6599 } 6600 final int start = range[0]; 6601 final int end = range[1]; 6602 setAccessibilityCursorPosition(start); 6603 sendViewTextTraversedAtGranularityEvent( 6604 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6605 granularity, start, end); 6606 return true; 6607 } 6608 6609 private boolean previousAtGranularity(int granularity) { 6610 CharSequence text = getIterableTextForAccessibility(); 6611 if (text != null && text.length() > 0) { 6612 return false; 6613 } 6614 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6615 if (iterator == null) { 6616 return false; 6617 } 6618 final int selectionStart = getAccessibilityCursorPosition(); 6619 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6620 final int[] range = iterator.preceding(current); 6621 if (range == null) { 6622 setAccessibilityCursorPosition(-1); 6623 return false; 6624 } 6625 final int start = range[0]; 6626 final int end = range[1]; 6627 setAccessibilityCursorPosition(end); 6628 sendViewTextTraversedAtGranularityEvent( 6629 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6630 granularity, start, end); 6631 return true; 6632 } 6633 6634 /** 6635 * Gets the text reported for accessibility purposes. 6636 * 6637 * @return The accessibility text. 6638 * 6639 * @hide 6640 */ 6641 public CharSequence getIterableTextForAccessibility() { 6642 return mContentDescription; 6643 } 6644 6645 /** 6646 * @hide 6647 */ 6648 public int getAccessibilityCursorPosition() { 6649 return mAccessibilityCursorPosition; 6650 } 6651 6652 /** 6653 * @hide 6654 */ 6655 public void setAccessibilityCursorPosition(int position) { 6656 mAccessibilityCursorPosition = position; 6657 } 6658 6659 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6660 int fromIndex, int toIndex) { 6661 if (mParent == null) { 6662 return; 6663 } 6664 AccessibilityEvent event = AccessibilityEvent.obtain( 6665 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6666 onInitializeAccessibilityEvent(event); 6667 onPopulateAccessibilityEvent(event); 6668 event.setFromIndex(fromIndex); 6669 event.setToIndex(toIndex); 6670 event.setAction(action); 6671 event.setMovementGranularity(granularity); 6672 mParent.requestSendAccessibilityEvent(this, event); 6673 } 6674 6675 /** 6676 * @hide 6677 */ 6678 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6679 switch (granularity) { 6680 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6681 CharSequence text = getIterableTextForAccessibility(); 6682 if (text != null && text.length() > 0) { 6683 CharacterTextSegmentIterator iterator = 6684 CharacterTextSegmentIterator.getInstance(mContext); 6685 iterator.initialize(text.toString()); 6686 return iterator; 6687 } 6688 } break; 6689 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6690 CharSequence text = getIterableTextForAccessibility(); 6691 if (text != null && text.length() > 0) { 6692 WordTextSegmentIterator iterator = 6693 WordTextSegmentIterator.getInstance(mContext); 6694 iterator.initialize(text.toString()); 6695 return iterator; 6696 } 6697 } break; 6698 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6699 CharSequence text = getIterableTextForAccessibility(); 6700 if (text != null && text.length() > 0) { 6701 ParagraphTextSegmentIterator iterator = 6702 ParagraphTextSegmentIterator.getInstance(); 6703 iterator.initialize(text.toString()); 6704 return iterator; 6705 } 6706 } break; 6707 } 6708 return null; 6709 } 6710 6711 /** 6712 * @hide 6713 */ 6714 public void dispatchStartTemporaryDetach() { 6715 clearAccessibilityFocus(); 6716 onStartTemporaryDetach(); 6717 } 6718 6719 /** 6720 * This is called when a container is going to temporarily detach a child, with 6721 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6722 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6723 * {@link #onDetachedFromWindow()} when the container is done. 6724 */ 6725 public void onStartTemporaryDetach() { 6726 removeUnsetPressCallback(); 6727 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6728 } 6729 6730 /** 6731 * @hide 6732 */ 6733 public void dispatchFinishTemporaryDetach() { 6734 onFinishTemporaryDetach(); 6735 } 6736 6737 /** 6738 * Called after {@link #onStartTemporaryDetach} when the container is done 6739 * changing the view. 6740 */ 6741 public void onFinishTemporaryDetach() { 6742 } 6743 6744 /** 6745 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6746 * for this view's window. Returns null if the view is not currently attached 6747 * to the window. Normally you will not need to use this directly, but 6748 * just use the standard high-level event callbacks like 6749 * {@link #onKeyDown(int, KeyEvent)}. 6750 */ 6751 public KeyEvent.DispatcherState getKeyDispatcherState() { 6752 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6753 } 6754 6755 /** 6756 * Dispatch a key event before it is processed by any input method 6757 * associated with the view hierarchy. This can be used to intercept 6758 * key events in special situations before the IME consumes them; a 6759 * typical example would be handling the BACK key to update the application's 6760 * UI instead of allowing the IME to see it and close itself. 6761 * 6762 * @param event The key event to be dispatched. 6763 * @return True if the event was handled, false otherwise. 6764 */ 6765 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6766 return onKeyPreIme(event.getKeyCode(), event); 6767 } 6768 6769 /** 6770 * Dispatch a key event to the next view on the focus path. This path runs 6771 * from the top of the view tree down to the currently focused view. If this 6772 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6773 * the next node down the focus path. This method also fires any key 6774 * listeners. 6775 * 6776 * @param event The key event to be dispatched. 6777 * @return True if the event was handled, false otherwise. 6778 */ 6779 public boolean dispatchKeyEvent(KeyEvent event) { 6780 if (mInputEventConsistencyVerifier != null) { 6781 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6782 } 6783 6784 // Give any attached key listener a first crack at the event. 6785 //noinspection SimplifiableIfStatement 6786 ListenerInfo li = mListenerInfo; 6787 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6788 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6789 return true; 6790 } 6791 6792 if (event.dispatch(this, mAttachInfo != null 6793 ? mAttachInfo.mKeyDispatchState : null, this)) { 6794 return true; 6795 } 6796 6797 if (mInputEventConsistencyVerifier != null) { 6798 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6799 } 6800 return false; 6801 } 6802 6803 /** 6804 * Dispatches a key shortcut event. 6805 * 6806 * @param event The key event to be dispatched. 6807 * @return True if the event was handled by the view, false otherwise. 6808 */ 6809 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6810 return onKeyShortcut(event.getKeyCode(), event); 6811 } 6812 6813 /** 6814 * Pass the touch screen motion event down to the target view, or this 6815 * view if it is the target. 6816 * 6817 * @param event The motion event to be dispatched. 6818 * @return True if the event was handled by the view, false otherwise. 6819 */ 6820 public boolean dispatchTouchEvent(MotionEvent event) { 6821 if (mInputEventConsistencyVerifier != null) { 6822 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6823 } 6824 6825 if (onFilterTouchEventForSecurity(event)) { 6826 //noinspection SimplifiableIfStatement 6827 ListenerInfo li = mListenerInfo; 6828 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6829 && li.mOnTouchListener.onTouch(this, event)) { 6830 return true; 6831 } 6832 6833 if (onTouchEvent(event)) { 6834 return true; 6835 } 6836 } 6837 6838 if (mInputEventConsistencyVerifier != null) { 6839 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6840 } 6841 return false; 6842 } 6843 6844 /** 6845 * Filter the touch event to apply security policies. 6846 * 6847 * @param event The motion event to be filtered. 6848 * @return True if the event should be dispatched, false if the event should be dropped. 6849 * 6850 * @see #getFilterTouchesWhenObscured 6851 */ 6852 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6853 //noinspection RedundantIfStatement 6854 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6855 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6856 // Window is obscured, drop this touch. 6857 return false; 6858 } 6859 return true; 6860 } 6861 6862 /** 6863 * Pass a trackball motion event down to the focused view. 6864 * 6865 * @param event The motion event to be dispatched. 6866 * @return True if the event was handled by the view, false otherwise. 6867 */ 6868 public boolean dispatchTrackballEvent(MotionEvent event) { 6869 if (mInputEventConsistencyVerifier != null) { 6870 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6871 } 6872 6873 return onTrackballEvent(event); 6874 } 6875 6876 /** 6877 * Dispatch a generic motion event. 6878 * <p> 6879 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6880 * are delivered to the view under the pointer. All other generic motion events are 6881 * delivered to the focused view. Hover events are handled specially and are delivered 6882 * to {@link #onHoverEvent(MotionEvent)}. 6883 * </p> 6884 * 6885 * @param event The motion event to be dispatched. 6886 * @return True if the event was handled by the view, false otherwise. 6887 */ 6888 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6889 if (mInputEventConsistencyVerifier != null) { 6890 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6891 } 6892 6893 final int source = event.getSource(); 6894 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6895 final int action = event.getAction(); 6896 if (action == MotionEvent.ACTION_HOVER_ENTER 6897 || action == MotionEvent.ACTION_HOVER_MOVE 6898 || action == MotionEvent.ACTION_HOVER_EXIT) { 6899 if (dispatchHoverEvent(event)) { 6900 return true; 6901 } 6902 } else if (dispatchGenericPointerEvent(event)) { 6903 return true; 6904 } 6905 } else if (dispatchGenericFocusedEvent(event)) { 6906 return true; 6907 } 6908 6909 if (dispatchGenericMotionEventInternal(event)) { 6910 return true; 6911 } 6912 6913 if (mInputEventConsistencyVerifier != null) { 6914 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6915 } 6916 return false; 6917 } 6918 6919 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6920 //noinspection SimplifiableIfStatement 6921 ListenerInfo li = mListenerInfo; 6922 if (li != null && li.mOnGenericMotionListener != null 6923 && (mViewFlags & ENABLED_MASK) == ENABLED 6924 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6925 return true; 6926 } 6927 6928 if (onGenericMotionEvent(event)) { 6929 return true; 6930 } 6931 6932 if (mInputEventConsistencyVerifier != null) { 6933 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6934 } 6935 return false; 6936 } 6937 6938 /** 6939 * Dispatch a hover event. 6940 * <p> 6941 * Do not call this method directly. 6942 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6943 * </p> 6944 * 6945 * @param event The motion event to be dispatched. 6946 * @return True if the event was handled by the view, false otherwise. 6947 */ 6948 protected boolean dispatchHoverEvent(MotionEvent event) { 6949 //noinspection SimplifiableIfStatement 6950 ListenerInfo li = mListenerInfo; 6951 if (li != null && li.mOnHoverListener != null 6952 && (mViewFlags & ENABLED_MASK) == ENABLED 6953 && li.mOnHoverListener.onHover(this, event)) { 6954 return true; 6955 } 6956 6957 return onHoverEvent(event); 6958 } 6959 6960 /** 6961 * Returns true if the view has a child to which it has recently sent 6962 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6963 * it does not have a hovered child, then it must be the innermost hovered view. 6964 * @hide 6965 */ 6966 protected boolean hasHoveredChild() { 6967 return false; 6968 } 6969 6970 /** 6971 * Dispatch a generic motion event to the view under the first pointer. 6972 * <p> 6973 * Do not call this method directly. 6974 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6975 * </p> 6976 * 6977 * @param event The motion event to be dispatched. 6978 * @return True if the event was handled by the view, false otherwise. 6979 */ 6980 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 6981 return false; 6982 } 6983 6984 /** 6985 * Dispatch a generic motion event to the currently focused view. 6986 * <p> 6987 * Do not call this method directly. 6988 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6989 * </p> 6990 * 6991 * @param event The motion event to be dispatched. 6992 * @return True if the event was handled by the view, false otherwise. 6993 */ 6994 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 6995 return false; 6996 } 6997 6998 /** 6999 * Dispatch a pointer event. 7000 * <p> 7001 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7002 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7003 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7004 * and should not be expected to handle other pointing device features. 7005 * </p> 7006 * 7007 * @param event The motion event to be dispatched. 7008 * @return True if the event was handled by the view, false otherwise. 7009 * @hide 7010 */ 7011 public final boolean dispatchPointerEvent(MotionEvent event) { 7012 if (event.isTouchEvent()) { 7013 return dispatchTouchEvent(event); 7014 } else { 7015 return dispatchGenericMotionEvent(event); 7016 } 7017 } 7018 7019 /** 7020 * Called when the window containing this view gains or loses window focus. 7021 * ViewGroups should override to route to their children. 7022 * 7023 * @param hasFocus True if the window containing this view now has focus, 7024 * false otherwise. 7025 */ 7026 public void dispatchWindowFocusChanged(boolean hasFocus) { 7027 onWindowFocusChanged(hasFocus); 7028 } 7029 7030 /** 7031 * Called when the window containing this view gains or loses focus. Note 7032 * that this is separate from view focus: to receive key events, both 7033 * your view and its window must have focus. If a window is displayed 7034 * on top of yours that takes input focus, then your own window will lose 7035 * focus but the view focus will remain unchanged. 7036 * 7037 * @param hasWindowFocus True if the window containing this view now has 7038 * focus, false otherwise. 7039 */ 7040 public void onWindowFocusChanged(boolean hasWindowFocus) { 7041 InputMethodManager imm = InputMethodManager.peekInstance(); 7042 if (!hasWindowFocus) { 7043 if (isPressed()) { 7044 setPressed(false); 7045 } 7046 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7047 imm.focusOut(this); 7048 } 7049 removeLongPressCallback(); 7050 removeTapCallback(); 7051 onFocusLost(); 7052 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7053 imm.focusIn(this); 7054 } 7055 refreshDrawableState(); 7056 } 7057 7058 /** 7059 * Returns true if this view is in a window that currently has window focus. 7060 * Note that this is not the same as the view itself having focus. 7061 * 7062 * @return True if this view is in a window that currently has window focus. 7063 */ 7064 public boolean hasWindowFocus() { 7065 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7066 } 7067 7068 /** 7069 * Dispatch a view visibility change down the view hierarchy. 7070 * ViewGroups should override to route to their children. 7071 * @param changedView The view whose visibility changed. Could be 'this' or 7072 * an ancestor view. 7073 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7074 * {@link #INVISIBLE} or {@link #GONE}. 7075 */ 7076 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7077 onVisibilityChanged(changedView, visibility); 7078 } 7079 7080 /** 7081 * Called when the visibility of the view or an ancestor of the view is changed. 7082 * @param changedView The view whose visibility changed. Could be 'this' or 7083 * an ancestor view. 7084 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7085 * {@link #INVISIBLE} or {@link #GONE}. 7086 */ 7087 protected void onVisibilityChanged(View changedView, int visibility) { 7088 if (visibility == VISIBLE) { 7089 if (mAttachInfo != null) { 7090 initialAwakenScrollBars(); 7091 } else { 7092 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7093 } 7094 } 7095 } 7096 7097 /** 7098 * Dispatch a hint about whether this view is displayed. For instance, when 7099 * a View moves out of the screen, it might receives a display hint indicating 7100 * the view is not displayed. Applications should not <em>rely</em> on this hint 7101 * as there is no guarantee that they will receive one. 7102 * 7103 * @param hint A hint about whether or not this view is displayed: 7104 * {@link #VISIBLE} or {@link #INVISIBLE}. 7105 */ 7106 public void dispatchDisplayHint(int hint) { 7107 onDisplayHint(hint); 7108 } 7109 7110 /** 7111 * Gives this view a hint about whether is displayed or not. For instance, when 7112 * a View moves out of the screen, it might receives a display hint indicating 7113 * the view is not displayed. Applications should not <em>rely</em> on this hint 7114 * as there is no guarantee that they will receive one. 7115 * 7116 * @param hint A hint about whether or not this view is displayed: 7117 * {@link #VISIBLE} or {@link #INVISIBLE}. 7118 */ 7119 protected void onDisplayHint(int hint) { 7120 } 7121 7122 /** 7123 * Dispatch a window visibility change down the view hierarchy. 7124 * ViewGroups should override to route to their children. 7125 * 7126 * @param visibility The new visibility of the window. 7127 * 7128 * @see #onWindowVisibilityChanged(int) 7129 */ 7130 public void dispatchWindowVisibilityChanged(int visibility) { 7131 onWindowVisibilityChanged(visibility); 7132 } 7133 7134 /** 7135 * Called when the window containing has change its visibility 7136 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7137 * that this tells you whether or not your window is being made visible 7138 * to the window manager; this does <em>not</em> tell you whether or not 7139 * your window is obscured by other windows on the screen, even if it 7140 * is itself visible. 7141 * 7142 * @param visibility The new visibility of the window. 7143 */ 7144 protected void onWindowVisibilityChanged(int visibility) { 7145 if (visibility == VISIBLE) { 7146 initialAwakenScrollBars(); 7147 } 7148 } 7149 7150 /** 7151 * Returns the current visibility of the window this view is attached to 7152 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7153 * 7154 * @return Returns the current visibility of the view's window. 7155 */ 7156 public int getWindowVisibility() { 7157 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7158 } 7159 7160 /** 7161 * Retrieve the overall visible display size in which the window this view is 7162 * attached to has been positioned in. This takes into account screen 7163 * decorations above the window, for both cases where the window itself 7164 * is being position inside of them or the window is being placed under 7165 * then and covered insets are used for the window to position its content 7166 * inside. In effect, this tells you the available area where content can 7167 * be placed and remain visible to users. 7168 * 7169 * <p>This function requires an IPC back to the window manager to retrieve 7170 * the requested information, so should not be used in performance critical 7171 * code like drawing. 7172 * 7173 * @param outRect Filled in with the visible display frame. If the view 7174 * is not attached to a window, this is simply the raw display size. 7175 */ 7176 public void getWindowVisibleDisplayFrame(Rect outRect) { 7177 if (mAttachInfo != null) { 7178 try { 7179 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7180 } catch (RemoteException e) { 7181 return; 7182 } 7183 // XXX This is really broken, and probably all needs to be done 7184 // in the window manager, and we need to know more about whether 7185 // we want the area behind or in front of the IME. 7186 final Rect insets = mAttachInfo.mVisibleInsets; 7187 outRect.left += insets.left; 7188 outRect.top += insets.top; 7189 outRect.right -= insets.right; 7190 outRect.bottom -= insets.bottom; 7191 return; 7192 } 7193 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7194 d.getRectSize(outRect); 7195 } 7196 7197 /** 7198 * Dispatch a notification about a resource configuration change down 7199 * the view hierarchy. 7200 * ViewGroups should override to route to their children. 7201 * 7202 * @param newConfig The new resource configuration. 7203 * 7204 * @see #onConfigurationChanged(android.content.res.Configuration) 7205 */ 7206 public void dispatchConfigurationChanged(Configuration newConfig) { 7207 onConfigurationChanged(newConfig); 7208 } 7209 7210 /** 7211 * Called when the current configuration of the resources being used 7212 * by the application have changed. You can use this to decide when 7213 * to reload resources that can changed based on orientation and other 7214 * configuration characterstics. You only need to use this if you are 7215 * not relying on the normal {@link android.app.Activity} mechanism of 7216 * recreating the activity instance upon a configuration change. 7217 * 7218 * @param newConfig The new resource configuration. 7219 */ 7220 protected void onConfigurationChanged(Configuration newConfig) { 7221 } 7222 7223 /** 7224 * Private function to aggregate all per-view attributes in to the view 7225 * root. 7226 */ 7227 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7228 performCollectViewAttributes(attachInfo, visibility); 7229 } 7230 7231 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7232 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7233 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7234 attachInfo.mKeepScreenOn = true; 7235 } 7236 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7237 ListenerInfo li = mListenerInfo; 7238 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7239 attachInfo.mHasSystemUiListeners = true; 7240 } 7241 } 7242 } 7243 7244 void needGlobalAttributesUpdate(boolean force) { 7245 final AttachInfo ai = mAttachInfo; 7246 if (ai != null) { 7247 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7248 || ai.mHasSystemUiListeners) { 7249 ai.mRecomputeGlobalAttributes = true; 7250 } 7251 } 7252 } 7253 7254 /** 7255 * Returns whether the device is currently in touch mode. Touch mode is entered 7256 * once the user begins interacting with the device by touch, and affects various 7257 * things like whether focus is always visible to the user. 7258 * 7259 * @return Whether the device is in touch mode. 7260 */ 7261 @ViewDebug.ExportedProperty 7262 public boolean isInTouchMode() { 7263 if (mAttachInfo != null) { 7264 return mAttachInfo.mInTouchMode; 7265 } else { 7266 return ViewRootImpl.isInTouchMode(); 7267 } 7268 } 7269 7270 /** 7271 * Returns the context the view is running in, through which it can 7272 * access the current theme, resources, etc. 7273 * 7274 * @return The view's Context. 7275 */ 7276 @ViewDebug.CapturedViewProperty 7277 public final Context getContext() { 7278 return mContext; 7279 } 7280 7281 /** 7282 * Handle a key event before it is processed by any input method 7283 * associated with the view hierarchy. This can be used to intercept 7284 * key events in special situations before the IME consumes them; a 7285 * typical example would be handling the BACK key to update the application's 7286 * UI instead of allowing the IME to see it and close itself. 7287 * 7288 * @param keyCode The value in event.getKeyCode(). 7289 * @param event Description of the key event. 7290 * @return If you handled the event, return true. If you want to allow the 7291 * event to be handled by the next receiver, return false. 7292 */ 7293 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7294 return false; 7295 } 7296 7297 /** 7298 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7299 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7300 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7301 * is released, if the view is enabled and clickable. 7302 * 7303 * @param keyCode A key code that represents the button pressed, from 7304 * {@link android.view.KeyEvent}. 7305 * @param event The KeyEvent object that defines the button action. 7306 */ 7307 public boolean onKeyDown(int keyCode, KeyEvent event) { 7308 boolean result = false; 7309 7310 switch (keyCode) { 7311 case KeyEvent.KEYCODE_DPAD_CENTER: 7312 case KeyEvent.KEYCODE_ENTER: { 7313 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7314 return true; 7315 } 7316 // Long clickable items don't necessarily have to be clickable 7317 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7318 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7319 (event.getRepeatCount() == 0)) { 7320 setPressed(true); 7321 checkForLongClick(0); 7322 return true; 7323 } 7324 break; 7325 } 7326 } 7327 return result; 7328 } 7329 7330 /** 7331 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7332 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7333 * the event). 7334 */ 7335 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7336 return false; 7337 } 7338 7339 /** 7340 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7341 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7342 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7343 * {@link KeyEvent#KEYCODE_ENTER} is released. 7344 * 7345 * @param keyCode A key code that represents the button pressed, from 7346 * {@link android.view.KeyEvent}. 7347 * @param event The KeyEvent object that defines the button action. 7348 */ 7349 public boolean onKeyUp(int keyCode, KeyEvent event) { 7350 boolean result = false; 7351 7352 switch (keyCode) { 7353 case KeyEvent.KEYCODE_DPAD_CENTER: 7354 case KeyEvent.KEYCODE_ENTER: { 7355 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7356 return true; 7357 } 7358 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7359 setPressed(false); 7360 7361 if (!mHasPerformedLongPress) { 7362 // This is a tap, so remove the longpress check 7363 removeLongPressCallback(); 7364 7365 result = performClick(); 7366 } 7367 } 7368 break; 7369 } 7370 } 7371 return result; 7372 } 7373 7374 /** 7375 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7376 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7377 * the event). 7378 * 7379 * @param keyCode A key code that represents the button pressed, from 7380 * {@link android.view.KeyEvent}. 7381 * @param repeatCount The number of times the action was made. 7382 * @param event The KeyEvent object that defines the button action. 7383 */ 7384 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7385 return false; 7386 } 7387 7388 /** 7389 * Called on the focused view when a key shortcut event is not handled. 7390 * Override this method to implement local key shortcuts for the View. 7391 * Key shortcuts can also be implemented by setting the 7392 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7393 * 7394 * @param keyCode The value in event.getKeyCode(). 7395 * @param event Description of the key event. 7396 * @return If you handled the event, return true. If you want to allow the 7397 * event to be handled by the next receiver, return false. 7398 */ 7399 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7400 return false; 7401 } 7402 7403 /** 7404 * Check whether the called view is a text editor, in which case it 7405 * would make sense to automatically display a soft input window for 7406 * it. Subclasses should override this if they implement 7407 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7408 * a call on that method would return a non-null InputConnection, and 7409 * they are really a first-class editor that the user would normally 7410 * start typing on when the go into a window containing your view. 7411 * 7412 * <p>The default implementation always returns false. This does 7413 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7414 * will not be called or the user can not otherwise perform edits on your 7415 * view; it is just a hint to the system that this is not the primary 7416 * purpose of this view. 7417 * 7418 * @return Returns true if this view is a text editor, else false. 7419 */ 7420 public boolean onCheckIsTextEditor() { 7421 return false; 7422 } 7423 7424 /** 7425 * Create a new InputConnection for an InputMethod to interact 7426 * with the view. The default implementation returns null, since it doesn't 7427 * support input methods. You can override this to implement such support. 7428 * This is only needed for views that take focus and text input. 7429 * 7430 * <p>When implementing this, you probably also want to implement 7431 * {@link #onCheckIsTextEditor()} to indicate you will return a 7432 * non-null InputConnection. 7433 * 7434 * @param outAttrs Fill in with attribute information about the connection. 7435 */ 7436 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7437 return null; 7438 } 7439 7440 /** 7441 * Called by the {@link android.view.inputmethod.InputMethodManager} 7442 * when a view who is not the current 7443 * input connection target is trying to make a call on the manager. The 7444 * default implementation returns false; you can override this to return 7445 * true for certain views if you are performing InputConnection proxying 7446 * to them. 7447 * @param view The View that is making the InputMethodManager call. 7448 * @return Return true to allow the call, false to reject. 7449 */ 7450 public boolean checkInputConnectionProxy(View view) { 7451 return false; 7452 } 7453 7454 /** 7455 * Show the context menu for this view. It is not safe to hold on to the 7456 * menu after returning from this method. 7457 * 7458 * You should normally not overload this method. Overload 7459 * {@link #onCreateContextMenu(ContextMenu)} or define an 7460 * {@link OnCreateContextMenuListener} to add items to the context menu. 7461 * 7462 * @param menu The context menu to populate 7463 */ 7464 public void createContextMenu(ContextMenu menu) { 7465 ContextMenuInfo menuInfo = getContextMenuInfo(); 7466 7467 // Sets the current menu info so all items added to menu will have 7468 // my extra info set. 7469 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7470 7471 onCreateContextMenu(menu); 7472 ListenerInfo li = mListenerInfo; 7473 if (li != null && li.mOnCreateContextMenuListener != null) { 7474 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7475 } 7476 7477 // Clear the extra information so subsequent items that aren't mine don't 7478 // have my extra info. 7479 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7480 7481 if (mParent != null) { 7482 mParent.createContextMenu(menu); 7483 } 7484 } 7485 7486 /** 7487 * Views should implement this if they have extra information to associate 7488 * with the context menu. The return result is supplied as a parameter to 7489 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7490 * callback. 7491 * 7492 * @return Extra information about the item for which the context menu 7493 * should be shown. This information will vary across different 7494 * subclasses of View. 7495 */ 7496 protected ContextMenuInfo getContextMenuInfo() { 7497 return null; 7498 } 7499 7500 /** 7501 * Views should implement this if the view itself is going to add items to 7502 * the context menu. 7503 * 7504 * @param menu the context menu to populate 7505 */ 7506 protected void onCreateContextMenu(ContextMenu menu) { 7507 } 7508 7509 /** 7510 * Implement this method to handle trackball motion events. The 7511 * <em>relative</em> movement of the trackball since the last event 7512 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7513 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7514 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7515 * they will often be fractional values, representing the more fine-grained 7516 * movement information available from a trackball). 7517 * 7518 * @param event The motion event. 7519 * @return True if the event was handled, false otherwise. 7520 */ 7521 public boolean onTrackballEvent(MotionEvent event) { 7522 return false; 7523 } 7524 7525 /** 7526 * Implement this method to handle generic motion events. 7527 * <p> 7528 * Generic motion events describe joystick movements, mouse hovers, track pad 7529 * touches, scroll wheel movements and other input events. The 7530 * {@link MotionEvent#getSource() source} of the motion event specifies 7531 * the class of input that was received. Implementations of this method 7532 * must examine the bits in the source before processing the event. 7533 * The following code example shows how this is done. 7534 * </p><p> 7535 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7536 * are delivered to the view under the pointer. All other generic motion events are 7537 * delivered to the focused view. 7538 * </p> 7539 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7540 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7541 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7542 * // process the joystick movement... 7543 * return true; 7544 * } 7545 * } 7546 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7547 * switch (event.getAction()) { 7548 * case MotionEvent.ACTION_HOVER_MOVE: 7549 * // process the mouse hover movement... 7550 * return true; 7551 * case MotionEvent.ACTION_SCROLL: 7552 * // process the scroll wheel movement... 7553 * return true; 7554 * } 7555 * } 7556 * return super.onGenericMotionEvent(event); 7557 * }</pre> 7558 * 7559 * @param event The generic motion event being processed. 7560 * @return True if the event was handled, false otherwise. 7561 */ 7562 public boolean onGenericMotionEvent(MotionEvent event) { 7563 return false; 7564 } 7565 7566 /** 7567 * Implement this method to handle hover events. 7568 * <p> 7569 * This method is called whenever a pointer is hovering into, over, or out of the 7570 * bounds of a view and the view is not currently being touched. 7571 * Hover events are represented as pointer events with action 7572 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7573 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7574 * </p> 7575 * <ul> 7576 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7577 * when the pointer enters the bounds of the view.</li> 7578 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7579 * when the pointer has already entered the bounds of the view and has moved.</li> 7580 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7581 * when the pointer has exited the bounds of the view or when the pointer is 7582 * about to go down due to a button click, tap, or similar user action that 7583 * causes the view to be touched.</li> 7584 * </ul> 7585 * <p> 7586 * The view should implement this method to return true to indicate that it is 7587 * handling the hover event, such as by changing its drawable state. 7588 * </p><p> 7589 * The default implementation calls {@link #setHovered} to update the hovered state 7590 * of the view when a hover enter or hover exit event is received, if the view 7591 * is enabled and is clickable. The default implementation also sends hover 7592 * accessibility events. 7593 * </p> 7594 * 7595 * @param event The motion event that describes the hover. 7596 * @return True if the view handled the hover event. 7597 * 7598 * @see #isHovered 7599 * @see #setHovered 7600 * @see #onHoverChanged 7601 */ 7602 public boolean onHoverEvent(MotionEvent event) { 7603 // The root view may receive hover (or touch) events that are outside the bounds of 7604 // the window. This code ensures that we only send accessibility events for 7605 // hovers that are actually within the bounds of the root view. 7606 final int action = event.getActionMasked(); 7607 if (!mSendingHoverAccessibilityEvents) { 7608 if ((action == MotionEvent.ACTION_HOVER_ENTER 7609 || action == MotionEvent.ACTION_HOVER_MOVE) 7610 && !hasHoveredChild() 7611 && pointInView(event.getX(), event.getY())) { 7612 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7613 mSendingHoverAccessibilityEvents = true; 7614 requestAccessibilityFocusFromHover((int) event.getX(), (int) event.getY()); 7615 } 7616 } else { 7617 if (action == MotionEvent.ACTION_HOVER_EXIT 7618 || (action == MotionEvent.ACTION_MOVE 7619 && !pointInView(event.getX(), event.getY()))) { 7620 mSendingHoverAccessibilityEvents = false; 7621 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7622 // If the window does not have input focus we take away accessibility 7623 // focus as soon as the user stop hovering over the view. 7624 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7625 getViewRootImpl().setAccessibilityFocusedHost(null); 7626 } 7627 } 7628 } 7629 7630 if (isHoverable()) { 7631 switch (action) { 7632 case MotionEvent.ACTION_HOVER_ENTER: 7633 setHovered(true); 7634 break; 7635 case MotionEvent.ACTION_HOVER_EXIT: 7636 setHovered(false); 7637 break; 7638 } 7639 7640 // Dispatch the event to onGenericMotionEvent before returning true. 7641 // This is to provide compatibility with existing applications that 7642 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7643 // break because of the new default handling for hoverable views 7644 // in onHoverEvent. 7645 // Note that onGenericMotionEvent will be called by default when 7646 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7647 dispatchGenericMotionEventInternal(event); 7648 return true; 7649 } 7650 7651 return false; 7652 } 7653 7654 /** 7655 * Returns true if the view should handle {@link #onHoverEvent} 7656 * by calling {@link #setHovered} to change its hovered state. 7657 * 7658 * @return True if the view is hoverable. 7659 */ 7660 private boolean isHoverable() { 7661 final int viewFlags = mViewFlags; 7662 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7663 return false; 7664 } 7665 7666 return (viewFlags & CLICKABLE) == CLICKABLE 7667 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7668 } 7669 7670 /** 7671 * Returns true if the view is currently hovered. 7672 * 7673 * @return True if the view is currently hovered. 7674 * 7675 * @see #setHovered 7676 * @see #onHoverChanged 7677 */ 7678 @ViewDebug.ExportedProperty 7679 public boolean isHovered() { 7680 return (mPrivateFlags & HOVERED) != 0; 7681 } 7682 7683 /** 7684 * Sets whether the view is currently hovered. 7685 * <p> 7686 * Calling this method also changes the drawable state of the view. This 7687 * enables the view to react to hover by using different drawable resources 7688 * to change its appearance. 7689 * </p><p> 7690 * The {@link #onHoverChanged} method is called when the hovered state changes. 7691 * </p> 7692 * 7693 * @param hovered True if the view is hovered. 7694 * 7695 * @see #isHovered 7696 * @see #onHoverChanged 7697 */ 7698 public void setHovered(boolean hovered) { 7699 if (hovered) { 7700 if ((mPrivateFlags & HOVERED) == 0) { 7701 mPrivateFlags |= HOVERED; 7702 refreshDrawableState(); 7703 onHoverChanged(true); 7704 } 7705 } else { 7706 if ((mPrivateFlags & HOVERED) != 0) { 7707 mPrivateFlags &= ~HOVERED; 7708 refreshDrawableState(); 7709 onHoverChanged(false); 7710 } 7711 } 7712 } 7713 7714 /** 7715 * Implement this method to handle hover state changes. 7716 * <p> 7717 * This method is called whenever the hover state changes as a result of a 7718 * call to {@link #setHovered}. 7719 * </p> 7720 * 7721 * @param hovered The current hover state, as returned by {@link #isHovered}. 7722 * 7723 * @see #isHovered 7724 * @see #setHovered 7725 */ 7726 public void onHoverChanged(boolean hovered) { 7727 } 7728 7729 /** 7730 * Implement this method to handle touch screen motion events. 7731 * 7732 * @param event The motion event. 7733 * @return True if the event was handled, false otherwise. 7734 */ 7735 public boolean onTouchEvent(MotionEvent event) { 7736 final int viewFlags = mViewFlags; 7737 7738 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7739 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7740 setPressed(false); 7741 } 7742 // A disabled view that is clickable still consumes the touch 7743 // events, it just doesn't respond to them. 7744 return (((viewFlags & CLICKABLE) == CLICKABLE || 7745 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7746 } 7747 7748 if (mTouchDelegate != null) { 7749 if (mTouchDelegate.onTouchEvent(event)) { 7750 return true; 7751 } 7752 } 7753 7754 if (((viewFlags & CLICKABLE) == CLICKABLE || 7755 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7756 switch (event.getAction()) { 7757 case MotionEvent.ACTION_UP: 7758 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7759 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7760 // take focus if we don't have it already and we should in 7761 // touch mode. 7762 boolean focusTaken = false; 7763 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7764 focusTaken = requestFocus(); 7765 } 7766 7767 if (prepressed) { 7768 // The button is being released before we actually 7769 // showed it as pressed. Make it show the pressed 7770 // state now (before scheduling the click) to ensure 7771 // the user sees it. 7772 setPressed(true); 7773 } 7774 7775 if (!mHasPerformedLongPress) { 7776 // This is a tap, so remove the longpress check 7777 removeLongPressCallback(); 7778 7779 // Only perform take click actions if we were in the pressed state 7780 if (!focusTaken) { 7781 // Use a Runnable and post this rather than calling 7782 // performClick directly. This lets other visual state 7783 // of the view update before click actions start. 7784 if (mPerformClick == null) { 7785 mPerformClick = new PerformClick(); 7786 } 7787 if (!post(mPerformClick)) { 7788 performClick(); 7789 } 7790 } 7791 } 7792 7793 if (mUnsetPressedState == null) { 7794 mUnsetPressedState = new UnsetPressedState(); 7795 } 7796 7797 if (prepressed) { 7798 postDelayed(mUnsetPressedState, 7799 ViewConfiguration.getPressedStateDuration()); 7800 } else if (!post(mUnsetPressedState)) { 7801 // If the post failed, unpress right now 7802 mUnsetPressedState.run(); 7803 } 7804 removeTapCallback(); 7805 } 7806 break; 7807 7808 case MotionEvent.ACTION_DOWN: 7809 mHasPerformedLongPress = false; 7810 7811 if (performButtonActionOnTouchDown(event)) { 7812 break; 7813 } 7814 7815 // Walk up the hierarchy to determine if we're inside a scrolling container. 7816 boolean isInScrollingContainer = isInScrollingContainer(); 7817 7818 // For views inside a scrolling container, delay the pressed feedback for 7819 // a short period in case this is a scroll. 7820 if (isInScrollingContainer) { 7821 mPrivateFlags |= PREPRESSED; 7822 if (mPendingCheckForTap == null) { 7823 mPendingCheckForTap = new CheckForTap(); 7824 } 7825 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7826 } else { 7827 // Not inside a scrolling container, so show the feedback right away 7828 setPressed(true); 7829 checkForLongClick(0); 7830 } 7831 break; 7832 7833 case MotionEvent.ACTION_CANCEL: 7834 setPressed(false); 7835 removeTapCallback(); 7836 break; 7837 7838 case MotionEvent.ACTION_MOVE: 7839 final int x = (int) event.getX(); 7840 final int y = (int) event.getY(); 7841 7842 // Be lenient about moving outside of buttons 7843 if (!pointInView(x, y, mTouchSlop)) { 7844 // Outside button 7845 removeTapCallback(); 7846 if ((mPrivateFlags & PRESSED) != 0) { 7847 // Remove any future long press/tap checks 7848 removeLongPressCallback(); 7849 7850 setPressed(false); 7851 } 7852 } 7853 break; 7854 } 7855 return true; 7856 } 7857 7858 return false; 7859 } 7860 7861 /** 7862 * @hide 7863 */ 7864 public boolean isInScrollingContainer() { 7865 ViewParent p = getParent(); 7866 while (p != null && p instanceof ViewGroup) { 7867 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7868 return true; 7869 } 7870 p = p.getParent(); 7871 } 7872 return false; 7873 } 7874 7875 /** 7876 * Remove the longpress detection timer. 7877 */ 7878 private void removeLongPressCallback() { 7879 if (mPendingCheckForLongPress != null) { 7880 removeCallbacks(mPendingCheckForLongPress); 7881 } 7882 } 7883 7884 /** 7885 * Remove the pending click action 7886 */ 7887 private void removePerformClickCallback() { 7888 if (mPerformClick != null) { 7889 removeCallbacks(mPerformClick); 7890 } 7891 } 7892 7893 /** 7894 * Remove the prepress detection timer. 7895 */ 7896 private void removeUnsetPressCallback() { 7897 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7898 setPressed(false); 7899 removeCallbacks(mUnsetPressedState); 7900 } 7901 } 7902 7903 /** 7904 * Remove the tap detection timer. 7905 */ 7906 private void removeTapCallback() { 7907 if (mPendingCheckForTap != null) { 7908 mPrivateFlags &= ~PREPRESSED; 7909 removeCallbacks(mPendingCheckForTap); 7910 } 7911 } 7912 7913 /** 7914 * Cancels a pending long press. Your subclass can use this if you 7915 * want the context menu to come up if the user presses and holds 7916 * at the same place, but you don't want it to come up if they press 7917 * and then move around enough to cause scrolling. 7918 */ 7919 public void cancelLongPress() { 7920 removeLongPressCallback(); 7921 7922 /* 7923 * The prepressed state handled by the tap callback is a display 7924 * construct, but the tap callback will post a long press callback 7925 * less its own timeout. Remove it here. 7926 */ 7927 removeTapCallback(); 7928 } 7929 7930 /** 7931 * Remove the pending callback for sending a 7932 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7933 */ 7934 private void removeSendViewScrolledAccessibilityEventCallback() { 7935 if (mSendViewScrolledAccessibilityEvent != null) { 7936 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7937 } 7938 } 7939 7940 /** 7941 * Sets the TouchDelegate for this View. 7942 */ 7943 public void setTouchDelegate(TouchDelegate delegate) { 7944 mTouchDelegate = delegate; 7945 } 7946 7947 /** 7948 * Gets the TouchDelegate for this View. 7949 */ 7950 public TouchDelegate getTouchDelegate() { 7951 return mTouchDelegate; 7952 } 7953 7954 /** 7955 * Set flags controlling behavior of this view. 7956 * 7957 * @param flags Constant indicating the value which should be set 7958 * @param mask Constant indicating the bit range that should be changed 7959 */ 7960 void setFlags(int flags, int mask) { 7961 int old = mViewFlags; 7962 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7963 7964 int changed = mViewFlags ^ old; 7965 if (changed == 0) { 7966 return; 7967 } 7968 int privateFlags = mPrivateFlags; 7969 7970 /* Check if the FOCUSABLE bit has changed */ 7971 if (((changed & FOCUSABLE_MASK) != 0) && 7972 ((privateFlags & HAS_BOUNDS) !=0)) { 7973 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 7974 && ((privateFlags & FOCUSED) != 0)) { 7975 /* Give up focus if we are no longer focusable */ 7976 clearFocus(); 7977 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 7978 && ((privateFlags & FOCUSED) == 0)) { 7979 /* 7980 * Tell the view system that we are now available to take focus 7981 * if no one else already has it. 7982 */ 7983 if (mParent != null) mParent.focusableViewAvailable(this); 7984 } 7985 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7986 notifyAccessibilityStateChanged(); 7987 } 7988 } 7989 7990 if ((flags & VISIBILITY_MASK) == VISIBLE) { 7991 if ((changed & VISIBILITY_MASK) != 0) { 7992 /* 7993 * If this view is becoming visible, invalidate it in case it changed while 7994 * it was not visible. Marking it drawn ensures that the invalidation will 7995 * go through. 7996 */ 7997 mPrivateFlags |= DRAWN; 7998 invalidate(true); 7999 8000 needGlobalAttributesUpdate(true); 8001 8002 // a view becoming visible is worth notifying the parent 8003 // about in case nothing has focus. even if this specific view 8004 // isn't focusable, it may contain something that is, so let 8005 // the root view try to give this focus if nothing else does. 8006 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8007 mParent.focusableViewAvailable(this); 8008 } 8009 } 8010 } 8011 8012 /* Check if the GONE bit has changed */ 8013 if ((changed & GONE) != 0) { 8014 needGlobalAttributesUpdate(false); 8015 requestLayout(); 8016 8017 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8018 if (hasFocus()) clearFocus(); 8019 clearAccessibilityFocus(); 8020 destroyDrawingCache(); 8021 if (mParent instanceof View) { 8022 // GONE views noop invalidation, so invalidate the parent 8023 ((View) mParent).invalidate(true); 8024 } 8025 // Mark the view drawn to ensure that it gets invalidated properly the next 8026 // time it is visible and gets invalidated 8027 mPrivateFlags |= DRAWN; 8028 } 8029 if (mAttachInfo != null) { 8030 mAttachInfo.mViewVisibilityChanged = true; 8031 } 8032 } 8033 8034 /* Check if the VISIBLE bit has changed */ 8035 if ((changed & INVISIBLE) != 0) { 8036 needGlobalAttributesUpdate(false); 8037 /* 8038 * If this view is becoming invisible, set the DRAWN flag so that 8039 * the next invalidate() will not be skipped. 8040 */ 8041 mPrivateFlags |= DRAWN; 8042 8043 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8044 // root view becoming invisible shouldn't clear focus and accessibility focus 8045 if (getRootView() != this) { 8046 clearFocus(); 8047 clearAccessibilityFocus(); 8048 } 8049 } 8050 if (mAttachInfo != null) { 8051 mAttachInfo.mViewVisibilityChanged = true; 8052 } 8053 } 8054 8055 if ((changed & VISIBILITY_MASK) != 0) { 8056 if (mParent instanceof ViewGroup) { 8057 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8058 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8059 ((View) mParent).invalidate(true); 8060 } else if (mParent != null) { 8061 mParent.invalidateChild(this, null); 8062 } 8063 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8064 } 8065 8066 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8067 destroyDrawingCache(); 8068 } 8069 8070 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8071 destroyDrawingCache(); 8072 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8073 invalidateParentCaches(); 8074 } 8075 8076 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8077 destroyDrawingCache(); 8078 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8079 } 8080 8081 if ((changed & DRAW_MASK) != 0) { 8082 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8083 if (mBackground != null) { 8084 mPrivateFlags &= ~SKIP_DRAW; 8085 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8086 } else { 8087 mPrivateFlags |= SKIP_DRAW; 8088 } 8089 } else { 8090 mPrivateFlags &= ~SKIP_DRAW; 8091 } 8092 requestLayout(); 8093 invalidate(true); 8094 } 8095 8096 if ((changed & KEEP_SCREEN_ON) != 0) { 8097 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8098 mParent.recomputeViewAttributes(this); 8099 } 8100 } 8101 8102 if (AccessibilityManager.getInstance(mContext).isEnabled() 8103 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8104 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8105 notifyAccessibilityStateChanged(); 8106 } 8107 } 8108 8109 /** 8110 * Change the view's z order in the tree, so it's on top of other sibling 8111 * views 8112 */ 8113 public void bringToFront() { 8114 if (mParent != null) { 8115 mParent.bringChildToFront(this); 8116 } 8117 } 8118 8119 /** 8120 * This is called in response to an internal scroll in this view (i.e., the 8121 * view scrolled its own contents). This is typically as a result of 8122 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8123 * called. 8124 * 8125 * @param l Current horizontal scroll origin. 8126 * @param t Current vertical scroll origin. 8127 * @param oldl Previous horizontal scroll origin. 8128 * @param oldt Previous vertical scroll origin. 8129 */ 8130 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8131 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8132 postSendViewScrolledAccessibilityEventCallback(); 8133 } 8134 8135 mBackgroundSizeChanged = true; 8136 8137 final AttachInfo ai = mAttachInfo; 8138 if (ai != null) { 8139 ai.mViewScrollChanged = true; 8140 } 8141 } 8142 8143 /** 8144 * Interface definition for a callback to be invoked when the layout bounds of a view 8145 * changes due to layout processing. 8146 */ 8147 public interface OnLayoutChangeListener { 8148 /** 8149 * Called when the focus state of a view has changed. 8150 * 8151 * @param v The view whose state has changed. 8152 * @param left The new value of the view's left property. 8153 * @param top The new value of the view's top property. 8154 * @param right The new value of the view's right property. 8155 * @param bottom The new value of the view's bottom property. 8156 * @param oldLeft The previous value of the view's left property. 8157 * @param oldTop The previous value of the view's top property. 8158 * @param oldRight The previous value of the view's right property. 8159 * @param oldBottom The previous value of the view's bottom property. 8160 */ 8161 void onLayoutChange(View v, int left, int top, int right, int bottom, 8162 int oldLeft, int oldTop, int oldRight, int oldBottom); 8163 } 8164 8165 /** 8166 * This is called during layout when the size of this view has changed. If 8167 * you were just added to the view hierarchy, you're called with the old 8168 * values of 0. 8169 * 8170 * @param w Current width of this view. 8171 * @param h Current height of this view. 8172 * @param oldw Old width of this view. 8173 * @param oldh Old height of this view. 8174 */ 8175 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8176 } 8177 8178 /** 8179 * Called by draw to draw the child views. This may be overridden 8180 * by derived classes to gain control just before its children are drawn 8181 * (but after its own view has been drawn). 8182 * @param canvas the canvas on which to draw the view 8183 */ 8184 protected void dispatchDraw(Canvas canvas) { 8185 8186 } 8187 8188 /** 8189 * Gets the parent of this view. Note that the parent is a 8190 * ViewParent and not necessarily a View. 8191 * 8192 * @return Parent of this view. 8193 */ 8194 public final ViewParent getParent() { 8195 return mParent; 8196 } 8197 8198 /** 8199 * Set the horizontal scrolled position of your view. This will cause a call to 8200 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8201 * invalidated. 8202 * @param value the x position to scroll to 8203 */ 8204 public void setScrollX(int value) { 8205 scrollTo(value, mScrollY); 8206 } 8207 8208 /** 8209 * Set the vertical scrolled position of your view. This will cause a call to 8210 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8211 * invalidated. 8212 * @param value the y position to scroll to 8213 */ 8214 public void setScrollY(int value) { 8215 scrollTo(mScrollX, value); 8216 } 8217 8218 /** 8219 * Return the scrolled left position of this view. This is the left edge of 8220 * the displayed part of your view. You do not need to draw any pixels 8221 * farther left, since those are outside of the frame of your view on 8222 * screen. 8223 * 8224 * @return The left edge of the displayed part of your view, in pixels. 8225 */ 8226 public final int getScrollX() { 8227 return mScrollX; 8228 } 8229 8230 /** 8231 * Return the scrolled top position of this view. This is the top edge of 8232 * the displayed part of your view. You do not need to draw any pixels above 8233 * it, since those are outside of the frame of your view on screen. 8234 * 8235 * @return The top edge of the displayed part of your view, in pixels. 8236 */ 8237 public final int getScrollY() { 8238 return mScrollY; 8239 } 8240 8241 /** 8242 * Return the width of the your view. 8243 * 8244 * @return The width of your view, in pixels. 8245 */ 8246 @ViewDebug.ExportedProperty(category = "layout") 8247 public final int getWidth() { 8248 return mRight - mLeft; 8249 } 8250 8251 /** 8252 * Return the height of your view. 8253 * 8254 * @return The height of your view, in pixels. 8255 */ 8256 @ViewDebug.ExportedProperty(category = "layout") 8257 public final int getHeight() { 8258 return mBottom - mTop; 8259 } 8260 8261 /** 8262 * Return the visible drawing bounds of your view. Fills in the output 8263 * rectangle with the values from getScrollX(), getScrollY(), 8264 * getWidth(), and getHeight(). 8265 * 8266 * @param outRect The (scrolled) drawing bounds of the view. 8267 */ 8268 public void getDrawingRect(Rect outRect) { 8269 outRect.left = mScrollX; 8270 outRect.top = mScrollY; 8271 outRect.right = mScrollX + (mRight - mLeft); 8272 outRect.bottom = mScrollY + (mBottom - mTop); 8273 } 8274 8275 /** 8276 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8277 * raw width component (that is the result is masked by 8278 * {@link #MEASURED_SIZE_MASK}). 8279 * 8280 * @return The raw measured width of this view. 8281 */ 8282 public final int getMeasuredWidth() { 8283 return mMeasuredWidth & MEASURED_SIZE_MASK; 8284 } 8285 8286 /** 8287 * Return the full width measurement information for this view as computed 8288 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8289 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8290 * This should be used during measurement and layout calculations only. Use 8291 * {@link #getWidth()} to see how wide a view is after layout. 8292 * 8293 * @return The measured width of this view as a bit mask. 8294 */ 8295 public final int getMeasuredWidthAndState() { 8296 return mMeasuredWidth; 8297 } 8298 8299 /** 8300 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8301 * raw width component (that is the result is masked by 8302 * {@link #MEASURED_SIZE_MASK}). 8303 * 8304 * @return The raw measured height of this view. 8305 */ 8306 public final int getMeasuredHeight() { 8307 return mMeasuredHeight & MEASURED_SIZE_MASK; 8308 } 8309 8310 /** 8311 * Return the full height measurement information for this view as computed 8312 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8313 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8314 * This should be used during measurement and layout calculations only. Use 8315 * {@link #getHeight()} to see how wide a view is after layout. 8316 * 8317 * @return The measured width of this view as a bit mask. 8318 */ 8319 public final int getMeasuredHeightAndState() { 8320 return mMeasuredHeight; 8321 } 8322 8323 /** 8324 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8325 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8326 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8327 * and the height component is at the shifted bits 8328 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8329 */ 8330 public final int getMeasuredState() { 8331 return (mMeasuredWidth&MEASURED_STATE_MASK) 8332 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8333 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8334 } 8335 8336 /** 8337 * The transform matrix of this view, which is calculated based on the current 8338 * roation, scale, and pivot properties. 8339 * 8340 * @see #getRotation() 8341 * @see #getScaleX() 8342 * @see #getScaleY() 8343 * @see #getPivotX() 8344 * @see #getPivotY() 8345 * @return The current transform matrix for the view 8346 */ 8347 public Matrix getMatrix() { 8348 if (mTransformationInfo != null) { 8349 updateMatrix(); 8350 return mTransformationInfo.mMatrix; 8351 } 8352 return Matrix.IDENTITY_MATRIX; 8353 } 8354 8355 /** 8356 * Utility function to determine if the value is far enough away from zero to be 8357 * considered non-zero. 8358 * @param value A floating point value to check for zero-ness 8359 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8360 */ 8361 private static boolean nonzero(float value) { 8362 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8363 } 8364 8365 /** 8366 * Returns true if the transform matrix is the identity matrix. 8367 * Recomputes the matrix if necessary. 8368 * 8369 * @return True if the transform matrix is the identity matrix, false otherwise. 8370 */ 8371 final boolean hasIdentityMatrix() { 8372 if (mTransformationInfo != null) { 8373 updateMatrix(); 8374 return mTransformationInfo.mMatrixIsIdentity; 8375 } 8376 return true; 8377 } 8378 8379 void ensureTransformationInfo() { 8380 if (mTransformationInfo == null) { 8381 mTransformationInfo = new TransformationInfo(); 8382 } 8383 } 8384 8385 /** 8386 * Recomputes the transform matrix if necessary. 8387 */ 8388 private void updateMatrix() { 8389 final TransformationInfo info = mTransformationInfo; 8390 if (info == null) { 8391 return; 8392 } 8393 if (info.mMatrixDirty) { 8394 // transform-related properties have changed since the last time someone 8395 // asked for the matrix; recalculate it with the current values 8396 8397 // Figure out if we need to update the pivot point 8398 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8399 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8400 info.mPrevWidth = mRight - mLeft; 8401 info.mPrevHeight = mBottom - mTop; 8402 info.mPivotX = info.mPrevWidth / 2f; 8403 info.mPivotY = info.mPrevHeight / 2f; 8404 } 8405 } 8406 info.mMatrix.reset(); 8407 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8408 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8409 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8410 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8411 } else { 8412 if (info.mCamera == null) { 8413 info.mCamera = new Camera(); 8414 info.matrix3D = new Matrix(); 8415 } 8416 info.mCamera.save(); 8417 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8418 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8419 info.mCamera.getMatrix(info.matrix3D); 8420 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8421 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8422 info.mPivotY + info.mTranslationY); 8423 info.mMatrix.postConcat(info.matrix3D); 8424 info.mCamera.restore(); 8425 } 8426 info.mMatrixDirty = false; 8427 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8428 info.mInverseMatrixDirty = true; 8429 } 8430 } 8431 8432 /** 8433 * Utility method to retrieve the inverse of the current mMatrix property. 8434 * We cache the matrix to avoid recalculating it when transform properties 8435 * have not changed. 8436 * 8437 * @return The inverse of the current matrix of this view. 8438 */ 8439 final Matrix getInverseMatrix() { 8440 final TransformationInfo info = mTransformationInfo; 8441 if (info != null) { 8442 updateMatrix(); 8443 if (info.mInverseMatrixDirty) { 8444 if (info.mInverseMatrix == null) { 8445 info.mInverseMatrix = new Matrix(); 8446 } 8447 info.mMatrix.invert(info.mInverseMatrix); 8448 info.mInverseMatrixDirty = false; 8449 } 8450 return info.mInverseMatrix; 8451 } 8452 return Matrix.IDENTITY_MATRIX; 8453 } 8454 8455 /** 8456 * Gets the distance along the Z axis from the camera to this view. 8457 * 8458 * @see #setCameraDistance(float) 8459 * 8460 * @return The distance along the Z axis. 8461 */ 8462 public float getCameraDistance() { 8463 ensureTransformationInfo(); 8464 final float dpi = mResources.getDisplayMetrics().densityDpi; 8465 final TransformationInfo info = mTransformationInfo; 8466 if (info.mCamera == null) { 8467 info.mCamera = new Camera(); 8468 info.matrix3D = new Matrix(); 8469 } 8470 return -(info.mCamera.getLocationZ() * dpi); 8471 } 8472 8473 /** 8474 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8475 * views are drawn) from the camera to this view. The camera's distance 8476 * affects 3D transformations, for instance rotations around the X and Y 8477 * axis. If the rotationX or rotationY properties are changed and this view is 8478 * large (more than half the size of the screen), it is recommended to always 8479 * use a camera distance that's greater than the height (X axis rotation) or 8480 * the width (Y axis rotation) of this view.</p> 8481 * 8482 * <p>The distance of the camera from the view plane can have an affect on the 8483 * perspective distortion of the view when it is rotated around the x or y axis. 8484 * For example, a large distance will result in a large viewing angle, and there 8485 * will not be much perspective distortion of the view as it rotates. A short 8486 * distance may cause much more perspective distortion upon rotation, and can 8487 * also result in some drawing artifacts if the rotated view ends up partially 8488 * behind the camera (which is why the recommendation is to use a distance at 8489 * least as far as the size of the view, if the view is to be rotated.)</p> 8490 * 8491 * <p>The distance is expressed in "depth pixels." The default distance depends 8492 * on the screen density. For instance, on a medium density display, the 8493 * default distance is 1280. On a high density display, the default distance 8494 * is 1920.</p> 8495 * 8496 * <p>If you want to specify a distance that leads to visually consistent 8497 * results across various densities, use the following formula:</p> 8498 * <pre> 8499 * float scale = context.getResources().getDisplayMetrics().density; 8500 * view.setCameraDistance(distance * scale); 8501 * </pre> 8502 * 8503 * <p>The density scale factor of a high density display is 1.5, 8504 * and 1920 = 1280 * 1.5.</p> 8505 * 8506 * @param distance The distance in "depth pixels", if negative the opposite 8507 * value is used 8508 * 8509 * @see #setRotationX(float) 8510 * @see #setRotationY(float) 8511 */ 8512 public void setCameraDistance(float distance) { 8513 invalidateViewProperty(true, false); 8514 8515 ensureTransformationInfo(); 8516 final float dpi = mResources.getDisplayMetrics().densityDpi; 8517 final TransformationInfo info = mTransformationInfo; 8518 if (info.mCamera == null) { 8519 info.mCamera = new Camera(); 8520 info.matrix3D = new Matrix(); 8521 } 8522 8523 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8524 info.mMatrixDirty = true; 8525 8526 invalidateViewProperty(false, false); 8527 if (mDisplayList != null) { 8528 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8529 } 8530 } 8531 8532 /** 8533 * The degrees that the view is rotated around the pivot point. 8534 * 8535 * @see #setRotation(float) 8536 * @see #getPivotX() 8537 * @see #getPivotY() 8538 * 8539 * @return The degrees of rotation. 8540 */ 8541 @ViewDebug.ExportedProperty(category = "drawing") 8542 public float getRotation() { 8543 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8544 } 8545 8546 /** 8547 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8548 * result in clockwise rotation. 8549 * 8550 * @param rotation The degrees of rotation. 8551 * 8552 * @see #getRotation() 8553 * @see #getPivotX() 8554 * @see #getPivotY() 8555 * @see #setRotationX(float) 8556 * @see #setRotationY(float) 8557 * 8558 * @attr ref android.R.styleable#View_rotation 8559 */ 8560 public void setRotation(float rotation) { 8561 ensureTransformationInfo(); 8562 final TransformationInfo info = mTransformationInfo; 8563 if (info.mRotation != rotation) { 8564 // Double-invalidation is necessary to capture view's old and new areas 8565 invalidateViewProperty(true, false); 8566 info.mRotation = rotation; 8567 info.mMatrixDirty = true; 8568 invalidateViewProperty(false, true); 8569 if (mDisplayList != null) { 8570 mDisplayList.setRotation(rotation); 8571 } 8572 } 8573 } 8574 8575 /** 8576 * The degrees that the view is rotated around the vertical axis through the pivot point. 8577 * 8578 * @see #getPivotX() 8579 * @see #getPivotY() 8580 * @see #setRotationY(float) 8581 * 8582 * @return The degrees of Y rotation. 8583 */ 8584 @ViewDebug.ExportedProperty(category = "drawing") 8585 public float getRotationY() { 8586 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8587 } 8588 8589 /** 8590 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8591 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8592 * down the y axis. 8593 * 8594 * When rotating large views, it is recommended to adjust the camera distance 8595 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8596 * 8597 * @param rotationY The degrees of Y rotation. 8598 * 8599 * @see #getRotationY() 8600 * @see #getPivotX() 8601 * @see #getPivotY() 8602 * @see #setRotation(float) 8603 * @see #setRotationX(float) 8604 * @see #setCameraDistance(float) 8605 * 8606 * @attr ref android.R.styleable#View_rotationY 8607 */ 8608 public void setRotationY(float rotationY) { 8609 ensureTransformationInfo(); 8610 final TransformationInfo info = mTransformationInfo; 8611 if (info.mRotationY != rotationY) { 8612 invalidateViewProperty(true, false); 8613 info.mRotationY = rotationY; 8614 info.mMatrixDirty = true; 8615 invalidateViewProperty(false, true); 8616 if (mDisplayList != null) { 8617 mDisplayList.setRotationY(rotationY); 8618 } 8619 } 8620 } 8621 8622 /** 8623 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8624 * 8625 * @see #getPivotX() 8626 * @see #getPivotY() 8627 * @see #setRotationX(float) 8628 * 8629 * @return The degrees of X rotation. 8630 */ 8631 @ViewDebug.ExportedProperty(category = "drawing") 8632 public float getRotationX() { 8633 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8634 } 8635 8636 /** 8637 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8638 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8639 * x axis. 8640 * 8641 * When rotating large views, it is recommended to adjust the camera distance 8642 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8643 * 8644 * @param rotationX The degrees of X rotation. 8645 * 8646 * @see #getRotationX() 8647 * @see #getPivotX() 8648 * @see #getPivotY() 8649 * @see #setRotation(float) 8650 * @see #setRotationY(float) 8651 * @see #setCameraDistance(float) 8652 * 8653 * @attr ref android.R.styleable#View_rotationX 8654 */ 8655 public void setRotationX(float rotationX) { 8656 ensureTransformationInfo(); 8657 final TransformationInfo info = mTransformationInfo; 8658 if (info.mRotationX != rotationX) { 8659 invalidateViewProperty(true, false); 8660 info.mRotationX = rotationX; 8661 info.mMatrixDirty = true; 8662 invalidateViewProperty(false, true); 8663 if (mDisplayList != null) { 8664 mDisplayList.setRotationX(rotationX); 8665 } 8666 } 8667 } 8668 8669 /** 8670 * The amount that the view is scaled in x around the pivot point, as a proportion of 8671 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8672 * 8673 * <p>By default, this is 1.0f. 8674 * 8675 * @see #getPivotX() 8676 * @see #getPivotY() 8677 * @return The scaling factor. 8678 */ 8679 @ViewDebug.ExportedProperty(category = "drawing") 8680 public float getScaleX() { 8681 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8682 } 8683 8684 /** 8685 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8686 * the view's unscaled width. A value of 1 means that no scaling is applied. 8687 * 8688 * @param scaleX The scaling factor. 8689 * @see #getPivotX() 8690 * @see #getPivotY() 8691 * 8692 * @attr ref android.R.styleable#View_scaleX 8693 */ 8694 public void setScaleX(float scaleX) { 8695 ensureTransformationInfo(); 8696 final TransformationInfo info = mTransformationInfo; 8697 if (info.mScaleX != scaleX) { 8698 invalidateViewProperty(true, false); 8699 info.mScaleX = scaleX; 8700 info.mMatrixDirty = true; 8701 invalidateViewProperty(false, true); 8702 if (mDisplayList != null) { 8703 mDisplayList.setScaleX(scaleX); 8704 } 8705 } 8706 } 8707 8708 /** 8709 * The amount that the view is scaled in y around the pivot point, as a proportion of 8710 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8711 * 8712 * <p>By default, this is 1.0f. 8713 * 8714 * @see #getPivotX() 8715 * @see #getPivotY() 8716 * @return The scaling factor. 8717 */ 8718 @ViewDebug.ExportedProperty(category = "drawing") 8719 public float getScaleY() { 8720 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8721 } 8722 8723 /** 8724 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8725 * the view's unscaled width. A value of 1 means that no scaling is applied. 8726 * 8727 * @param scaleY The scaling factor. 8728 * @see #getPivotX() 8729 * @see #getPivotY() 8730 * 8731 * @attr ref android.R.styleable#View_scaleY 8732 */ 8733 public void setScaleY(float scaleY) { 8734 ensureTransformationInfo(); 8735 final TransformationInfo info = mTransformationInfo; 8736 if (info.mScaleY != scaleY) { 8737 invalidateViewProperty(true, false); 8738 info.mScaleY = scaleY; 8739 info.mMatrixDirty = true; 8740 invalidateViewProperty(false, true); 8741 if (mDisplayList != null) { 8742 mDisplayList.setScaleY(scaleY); 8743 } 8744 } 8745 } 8746 8747 /** 8748 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8749 * and {@link #setScaleX(float) scaled}. 8750 * 8751 * @see #getRotation() 8752 * @see #getScaleX() 8753 * @see #getScaleY() 8754 * @see #getPivotY() 8755 * @return The x location of the pivot point. 8756 * 8757 * @attr ref android.R.styleable#View_transformPivotX 8758 */ 8759 @ViewDebug.ExportedProperty(category = "drawing") 8760 public float getPivotX() { 8761 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8762 } 8763 8764 /** 8765 * Sets the x location of the point around which the view is 8766 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8767 * By default, the pivot point is centered on the object. 8768 * Setting this property disables this behavior and causes the view to use only the 8769 * explicitly set pivotX and pivotY values. 8770 * 8771 * @param pivotX The x location of the pivot point. 8772 * @see #getRotation() 8773 * @see #getScaleX() 8774 * @see #getScaleY() 8775 * @see #getPivotY() 8776 * 8777 * @attr ref android.R.styleable#View_transformPivotX 8778 */ 8779 public void setPivotX(float pivotX) { 8780 ensureTransformationInfo(); 8781 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8782 final TransformationInfo info = mTransformationInfo; 8783 if (info.mPivotX != pivotX) { 8784 invalidateViewProperty(true, false); 8785 info.mPivotX = pivotX; 8786 info.mMatrixDirty = true; 8787 invalidateViewProperty(false, true); 8788 if (mDisplayList != null) { 8789 mDisplayList.setPivotX(pivotX); 8790 } 8791 } 8792 } 8793 8794 /** 8795 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8796 * and {@link #setScaleY(float) scaled}. 8797 * 8798 * @see #getRotation() 8799 * @see #getScaleX() 8800 * @see #getScaleY() 8801 * @see #getPivotY() 8802 * @return The y location of the pivot point. 8803 * 8804 * @attr ref android.R.styleable#View_transformPivotY 8805 */ 8806 @ViewDebug.ExportedProperty(category = "drawing") 8807 public float getPivotY() { 8808 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8809 } 8810 8811 /** 8812 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8813 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8814 * Setting this property disables this behavior and causes the view to use only the 8815 * explicitly set pivotX and pivotY values. 8816 * 8817 * @param pivotY The y location of the pivot point. 8818 * @see #getRotation() 8819 * @see #getScaleX() 8820 * @see #getScaleY() 8821 * @see #getPivotY() 8822 * 8823 * @attr ref android.R.styleable#View_transformPivotY 8824 */ 8825 public void setPivotY(float pivotY) { 8826 ensureTransformationInfo(); 8827 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8828 final TransformationInfo info = mTransformationInfo; 8829 if (info.mPivotY != pivotY) { 8830 invalidateViewProperty(true, false); 8831 info.mPivotY = pivotY; 8832 info.mMatrixDirty = true; 8833 invalidateViewProperty(false, true); 8834 if (mDisplayList != null) { 8835 mDisplayList.setPivotY(pivotY); 8836 } 8837 } 8838 } 8839 8840 /** 8841 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8842 * completely transparent and 1 means the view is completely opaque. 8843 * 8844 * <p>By default this is 1.0f. 8845 * @return The opacity of the view. 8846 */ 8847 @ViewDebug.ExportedProperty(category = "drawing") 8848 public float getAlpha() { 8849 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8850 } 8851 8852 /** 8853 * Returns whether this View has content which overlaps. This function, intended to be 8854 * overridden by specific View types, is an optimization when alpha is set on a view. If 8855 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8856 * and then composited it into place, which can be expensive. If the view has no overlapping 8857 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8858 * An example of overlapping rendering is a TextView with a background image, such as a 8859 * Button. An example of non-overlapping rendering is a TextView with no background, or 8860 * an ImageView with only the foreground image. The default implementation returns true; 8861 * subclasses should override if they have cases which can be optimized. 8862 * 8863 * @return true if the content in this view might overlap, false otherwise. 8864 */ 8865 public boolean hasOverlappingRendering() { 8866 return true; 8867 } 8868 8869 /** 8870 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8871 * completely transparent and 1 means the view is completely opaque.</p> 8872 * 8873 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8874 * responsible for applying the opacity itself. Otherwise, calling this method is 8875 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8876 * setting a hardware layer.</p> 8877 * 8878 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8879 * performance implications. It is generally best to use the alpha property sparingly and 8880 * transiently, as in the case of fading animations.</p> 8881 * 8882 * @param alpha The opacity of the view. 8883 * 8884 * @see #setLayerType(int, android.graphics.Paint) 8885 * 8886 * @attr ref android.R.styleable#View_alpha 8887 */ 8888 public void setAlpha(float alpha) { 8889 ensureTransformationInfo(); 8890 if (mTransformationInfo.mAlpha != alpha) { 8891 mTransformationInfo.mAlpha = alpha; 8892 if (onSetAlpha((int) (alpha * 255))) { 8893 mPrivateFlags |= ALPHA_SET; 8894 // subclass is handling alpha - don't optimize rendering cache invalidation 8895 invalidateParentCaches(); 8896 invalidate(true); 8897 } else { 8898 mPrivateFlags &= ~ALPHA_SET; 8899 invalidateViewProperty(true, false); 8900 if (mDisplayList != null) { 8901 mDisplayList.setAlpha(alpha); 8902 } 8903 } 8904 } 8905 } 8906 8907 /** 8908 * Faster version of setAlpha() which performs the same steps except there are 8909 * no calls to invalidate(). The caller of this function should perform proper invalidation 8910 * on the parent and this object. The return value indicates whether the subclass handles 8911 * alpha (the return value for onSetAlpha()). 8912 * 8913 * @param alpha The new value for the alpha property 8914 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8915 * the new value for the alpha property is different from the old value 8916 */ 8917 boolean setAlphaNoInvalidation(float alpha) { 8918 ensureTransformationInfo(); 8919 if (mTransformationInfo.mAlpha != alpha) { 8920 mTransformationInfo.mAlpha = alpha; 8921 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8922 if (subclassHandlesAlpha) { 8923 mPrivateFlags |= ALPHA_SET; 8924 return true; 8925 } else { 8926 mPrivateFlags &= ~ALPHA_SET; 8927 if (mDisplayList != null) { 8928 mDisplayList.setAlpha(alpha); 8929 } 8930 } 8931 } 8932 return false; 8933 } 8934 8935 /** 8936 * Top position of this view relative to its parent. 8937 * 8938 * @return The top of this view, in pixels. 8939 */ 8940 @ViewDebug.CapturedViewProperty 8941 public final int getTop() { 8942 return mTop; 8943 } 8944 8945 /** 8946 * Sets the top position of this view relative to its parent. This method is meant to be called 8947 * by the layout system and should not generally be called otherwise, because the property 8948 * may be changed at any time by the layout. 8949 * 8950 * @param top The top of this view, in pixels. 8951 */ 8952 public final void setTop(int top) { 8953 if (top != mTop) { 8954 updateMatrix(); 8955 final boolean matrixIsIdentity = mTransformationInfo == null 8956 || mTransformationInfo.mMatrixIsIdentity; 8957 if (matrixIsIdentity) { 8958 if (mAttachInfo != null) { 8959 int minTop; 8960 int yLoc; 8961 if (top < mTop) { 8962 minTop = top; 8963 yLoc = top - mTop; 8964 } else { 8965 minTop = mTop; 8966 yLoc = 0; 8967 } 8968 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 8969 } 8970 } else { 8971 // Double-invalidation is necessary to capture view's old and new areas 8972 invalidate(true); 8973 } 8974 8975 int width = mRight - mLeft; 8976 int oldHeight = mBottom - mTop; 8977 8978 mTop = top; 8979 if (mDisplayList != null) { 8980 mDisplayList.setTop(mTop); 8981 } 8982 8983 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8984 8985 if (!matrixIsIdentity) { 8986 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8987 // A change in dimension means an auto-centered pivot point changes, too 8988 mTransformationInfo.mMatrixDirty = true; 8989 } 8990 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8991 invalidate(true); 8992 } 8993 mBackgroundSizeChanged = true; 8994 invalidateParentIfNeeded(); 8995 } 8996 } 8997 8998 /** 8999 * Bottom position of this view relative to its parent. 9000 * 9001 * @return The bottom of this view, in pixels. 9002 */ 9003 @ViewDebug.CapturedViewProperty 9004 public final int getBottom() { 9005 return mBottom; 9006 } 9007 9008 /** 9009 * True if this view has changed since the last time being drawn. 9010 * 9011 * @return The dirty state of this view. 9012 */ 9013 public boolean isDirty() { 9014 return (mPrivateFlags & DIRTY_MASK) != 0; 9015 } 9016 9017 /** 9018 * Sets the bottom position of this view relative to its parent. This method is meant to be 9019 * called by the layout system and should not generally be called otherwise, because the 9020 * property may be changed at any time by the layout. 9021 * 9022 * @param bottom The bottom of this view, in pixels. 9023 */ 9024 public final void setBottom(int bottom) { 9025 if (bottom != mBottom) { 9026 updateMatrix(); 9027 final boolean matrixIsIdentity = mTransformationInfo == null 9028 || mTransformationInfo.mMatrixIsIdentity; 9029 if (matrixIsIdentity) { 9030 if (mAttachInfo != null) { 9031 int maxBottom; 9032 if (bottom < mBottom) { 9033 maxBottom = mBottom; 9034 } else { 9035 maxBottom = bottom; 9036 } 9037 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9038 } 9039 } else { 9040 // Double-invalidation is necessary to capture view's old and new areas 9041 invalidate(true); 9042 } 9043 9044 int width = mRight - mLeft; 9045 int oldHeight = mBottom - mTop; 9046 9047 mBottom = bottom; 9048 if (mDisplayList != null) { 9049 mDisplayList.setBottom(mBottom); 9050 } 9051 9052 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9053 9054 if (!matrixIsIdentity) { 9055 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9056 // A change in dimension means an auto-centered pivot point changes, too 9057 mTransformationInfo.mMatrixDirty = true; 9058 } 9059 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9060 invalidate(true); 9061 } 9062 mBackgroundSizeChanged = true; 9063 invalidateParentIfNeeded(); 9064 } 9065 } 9066 9067 /** 9068 * Left position of this view relative to its parent. 9069 * 9070 * @return The left edge of this view, in pixels. 9071 */ 9072 @ViewDebug.CapturedViewProperty 9073 public final int getLeft() { 9074 return mLeft; 9075 } 9076 9077 /** 9078 * Sets the left position of this view relative to its parent. This method is meant to be called 9079 * by the layout system and should not generally be called otherwise, because the property 9080 * may be changed at any time by the layout. 9081 * 9082 * @param left The bottom of this view, in pixels. 9083 */ 9084 public final void setLeft(int left) { 9085 if (left != mLeft) { 9086 updateMatrix(); 9087 final boolean matrixIsIdentity = mTransformationInfo == null 9088 || mTransformationInfo.mMatrixIsIdentity; 9089 if (matrixIsIdentity) { 9090 if (mAttachInfo != null) { 9091 int minLeft; 9092 int xLoc; 9093 if (left < mLeft) { 9094 minLeft = left; 9095 xLoc = left - mLeft; 9096 } else { 9097 minLeft = mLeft; 9098 xLoc = 0; 9099 } 9100 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9101 } 9102 } else { 9103 // Double-invalidation is necessary to capture view's old and new areas 9104 invalidate(true); 9105 } 9106 9107 int oldWidth = mRight - mLeft; 9108 int height = mBottom - mTop; 9109 9110 mLeft = left; 9111 if (mDisplayList != null) { 9112 mDisplayList.setLeft(left); 9113 } 9114 9115 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9116 9117 if (!matrixIsIdentity) { 9118 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9119 // A change in dimension means an auto-centered pivot point changes, too 9120 mTransformationInfo.mMatrixDirty = true; 9121 } 9122 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9123 invalidate(true); 9124 } 9125 mBackgroundSizeChanged = true; 9126 invalidateParentIfNeeded(); 9127 } 9128 } 9129 9130 /** 9131 * Right position of this view relative to its parent. 9132 * 9133 * @return The right edge of this view, in pixels. 9134 */ 9135 @ViewDebug.CapturedViewProperty 9136 public final int getRight() { 9137 return mRight; 9138 } 9139 9140 /** 9141 * Sets the right position of this view relative to its parent. This method is meant to be called 9142 * by the layout system and should not generally be called otherwise, because the property 9143 * may be changed at any time by the layout. 9144 * 9145 * @param right The bottom of this view, in pixels. 9146 */ 9147 public final void setRight(int right) { 9148 if (right != mRight) { 9149 updateMatrix(); 9150 final boolean matrixIsIdentity = mTransformationInfo == null 9151 || mTransformationInfo.mMatrixIsIdentity; 9152 if (matrixIsIdentity) { 9153 if (mAttachInfo != null) { 9154 int maxRight; 9155 if (right < mRight) { 9156 maxRight = mRight; 9157 } else { 9158 maxRight = right; 9159 } 9160 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9161 } 9162 } else { 9163 // Double-invalidation is necessary to capture view's old and new areas 9164 invalidate(true); 9165 } 9166 9167 int oldWidth = mRight - mLeft; 9168 int height = mBottom - mTop; 9169 9170 mRight = right; 9171 if (mDisplayList != null) { 9172 mDisplayList.setRight(mRight); 9173 } 9174 9175 onSizeChanged(mRight - mLeft, height, oldWidth, height); 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 } 9188 } 9189 9190 /** 9191 * The visual x position of this view, in pixels. This is equivalent to the 9192 * {@link #setTranslationX(float) translationX} property plus the current 9193 * {@link #getLeft() left} property. 9194 * 9195 * @return The visual x position of this view, in pixels. 9196 */ 9197 @ViewDebug.ExportedProperty(category = "drawing") 9198 public float getX() { 9199 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9200 } 9201 9202 /** 9203 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9204 * {@link #setTranslationX(float) translationX} property to be the difference between 9205 * the x value passed in and the current {@link #getLeft() left} property. 9206 * 9207 * @param x The visual x position of this view, in pixels. 9208 */ 9209 public void setX(float x) { 9210 setTranslationX(x - mLeft); 9211 } 9212 9213 /** 9214 * The visual y position of this view, in pixels. This is equivalent to the 9215 * {@link #setTranslationY(float) translationY} property plus the current 9216 * {@link #getTop() top} property. 9217 * 9218 * @return The visual y position of this view, in pixels. 9219 */ 9220 @ViewDebug.ExportedProperty(category = "drawing") 9221 public float getY() { 9222 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9223 } 9224 9225 /** 9226 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9227 * {@link #setTranslationY(float) translationY} property to be the difference between 9228 * the y value passed in and the current {@link #getTop() top} property. 9229 * 9230 * @param y The visual y position of this view, in pixels. 9231 */ 9232 public void setY(float y) { 9233 setTranslationY(y - mTop); 9234 } 9235 9236 9237 /** 9238 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9239 * This position is post-layout, in addition to wherever the object's 9240 * layout placed it. 9241 * 9242 * @return The horizontal position of this view relative to its left position, in pixels. 9243 */ 9244 @ViewDebug.ExportedProperty(category = "drawing") 9245 public float getTranslationX() { 9246 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9247 } 9248 9249 /** 9250 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9251 * This effectively positions the object post-layout, in addition to wherever the object's 9252 * layout placed it. 9253 * 9254 * @param translationX The horizontal position of this view relative to its left position, 9255 * in pixels. 9256 * 9257 * @attr ref android.R.styleable#View_translationX 9258 */ 9259 public void setTranslationX(float translationX) { 9260 ensureTransformationInfo(); 9261 final TransformationInfo info = mTransformationInfo; 9262 if (info.mTranslationX != translationX) { 9263 // Double-invalidation is necessary to capture view's old and new areas 9264 invalidateViewProperty(true, false); 9265 info.mTranslationX = translationX; 9266 info.mMatrixDirty = true; 9267 invalidateViewProperty(false, true); 9268 if (mDisplayList != null) { 9269 mDisplayList.setTranslationX(translationX); 9270 } 9271 } 9272 } 9273 9274 /** 9275 * The horizontal location of this view relative to its {@link #getTop() top} position. 9276 * This position is post-layout, in addition to wherever the object's 9277 * layout placed it. 9278 * 9279 * @return The vertical position of this view relative to its top position, 9280 * in pixels. 9281 */ 9282 @ViewDebug.ExportedProperty(category = "drawing") 9283 public float getTranslationY() { 9284 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9285 } 9286 9287 /** 9288 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9289 * This effectively positions the object post-layout, in addition to wherever the object's 9290 * layout placed it. 9291 * 9292 * @param translationY The vertical position of this view relative to its top position, 9293 * in pixels. 9294 * 9295 * @attr ref android.R.styleable#View_translationY 9296 */ 9297 public void setTranslationY(float translationY) { 9298 ensureTransformationInfo(); 9299 final TransformationInfo info = mTransformationInfo; 9300 if (info.mTranslationY != translationY) { 9301 invalidateViewProperty(true, false); 9302 info.mTranslationY = translationY; 9303 info.mMatrixDirty = true; 9304 invalidateViewProperty(false, true); 9305 if (mDisplayList != null) { 9306 mDisplayList.setTranslationY(translationY); 9307 } 9308 } 9309 } 9310 9311 /** 9312 * Hit rectangle in parent's coordinates 9313 * 9314 * @param outRect The hit rectangle of the view. 9315 */ 9316 public void getHitRect(Rect outRect) { 9317 updateMatrix(); 9318 final TransformationInfo info = mTransformationInfo; 9319 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9320 outRect.set(mLeft, mTop, mRight, mBottom); 9321 } else { 9322 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9323 tmpRect.set(-info.mPivotX, -info.mPivotY, 9324 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9325 info.mMatrix.mapRect(tmpRect); 9326 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9327 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9328 } 9329 } 9330 9331 /** 9332 * Determines whether the given point, in local coordinates is inside the view. 9333 */ 9334 /*package*/ final boolean pointInView(float localX, float localY) { 9335 return localX >= 0 && localX < (mRight - mLeft) 9336 && localY >= 0 && localY < (mBottom - mTop); 9337 } 9338 9339 /** 9340 * Utility method to determine whether the given point, in local coordinates, 9341 * is inside the view, where the area of the view is expanded by the slop factor. 9342 * This method is called while processing touch-move events to determine if the event 9343 * is still within the view. 9344 */ 9345 private boolean pointInView(float localX, float localY, float slop) { 9346 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9347 localY < ((mBottom - mTop) + slop); 9348 } 9349 9350 /** 9351 * When a view has focus and the user navigates away from it, the next view is searched for 9352 * starting from the rectangle filled in by this method. 9353 * 9354 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9355 * of the view. However, if your view maintains some idea of internal selection, 9356 * such as a cursor, or a selected row or column, you should override this method and 9357 * fill in a more specific rectangle. 9358 * 9359 * @param r The rectangle to fill in, in this view's coordinates. 9360 */ 9361 public void getFocusedRect(Rect r) { 9362 getDrawingRect(r); 9363 } 9364 9365 /** 9366 * If some part of this view is not clipped by any of its parents, then 9367 * return that area in r in global (root) coordinates. To convert r to local 9368 * coordinates (without taking possible View rotations into account), offset 9369 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9370 * If the view is completely clipped or translated out, return false. 9371 * 9372 * @param r If true is returned, r holds the global coordinates of the 9373 * visible portion of this view. 9374 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9375 * between this view and its root. globalOffet may be null. 9376 * @return true if r is non-empty (i.e. part of the view is visible at the 9377 * root level. 9378 */ 9379 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9380 int width = mRight - mLeft; 9381 int height = mBottom - mTop; 9382 if (width > 0 && height > 0) { 9383 r.set(0, 0, width, height); 9384 if (globalOffset != null) { 9385 globalOffset.set(-mScrollX, -mScrollY); 9386 } 9387 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9388 } 9389 return false; 9390 } 9391 9392 public final boolean getGlobalVisibleRect(Rect r) { 9393 return getGlobalVisibleRect(r, null); 9394 } 9395 9396 public final boolean getLocalVisibleRect(Rect r) { 9397 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9398 if (getGlobalVisibleRect(r, offset)) { 9399 r.offset(-offset.x, -offset.y); // make r local 9400 return true; 9401 } 9402 return false; 9403 } 9404 9405 /** 9406 * Offset this view's vertical location by the specified number of pixels. 9407 * 9408 * @param offset the number of pixels to offset the view by 9409 */ 9410 public void offsetTopAndBottom(int offset) { 9411 if (offset != 0) { 9412 updateMatrix(); 9413 final boolean matrixIsIdentity = mTransformationInfo == null 9414 || mTransformationInfo.mMatrixIsIdentity; 9415 if (matrixIsIdentity) { 9416 if (mDisplayList != null) { 9417 invalidateViewProperty(false, false); 9418 } else { 9419 final ViewParent p = mParent; 9420 if (p != null && mAttachInfo != null) { 9421 final Rect r = mAttachInfo.mTmpInvalRect; 9422 int minTop; 9423 int maxBottom; 9424 int yLoc; 9425 if (offset < 0) { 9426 minTop = mTop + offset; 9427 maxBottom = mBottom; 9428 yLoc = offset; 9429 } else { 9430 minTop = mTop; 9431 maxBottom = mBottom + offset; 9432 yLoc = 0; 9433 } 9434 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9435 p.invalidateChild(this, r); 9436 } 9437 } 9438 } else { 9439 invalidateViewProperty(false, false); 9440 } 9441 9442 mTop += offset; 9443 mBottom += offset; 9444 if (mDisplayList != null) { 9445 mDisplayList.offsetTopBottom(offset); 9446 invalidateViewProperty(false, false); 9447 } else { 9448 if (!matrixIsIdentity) { 9449 invalidateViewProperty(false, true); 9450 } 9451 invalidateParentIfNeeded(); 9452 } 9453 } 9454 } 9455 9456 /** 9457 * Offset this view's horizontal location by the specified amount of pixels. 9458 * 9459 * @param offset the numer of pixels to offset the view by 9460 */ 9461 public void offsetLeftAndRight(int offset) { 9462 if (offset != 0) { 9463 updateMatrix(); 9464 final boolean matrixIsIdentity = mTransformationInfo == null 9465 || mTransformationInfo.mMatrixIsIdentity; 9466 if (matrixIsIdentity) { 9467 if (mDisplayList != null) { 9468 invalidateViewProperty(false, false); 9469 } else { 9470 final ViewParent p = mParent; 9471 if (p != null && mAttachInfo != null) { 9472 final Rect r = mAttachInfo.mTmpInvalRect; 9473 int minLeft; 9474 int maxRight; 9475 if (offset < 0) { 9476 minLeft = mLeft + offset; 9477 maxRight = mRight; 9478 } else { 9479 minLeft = mLeft; 9480 maxRight = mRight + offset; 9481 } 9482 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9483 p.invalidateChild(this, r); 9484 } 9485 } 9486 } else { 9487 invalidateViewProperty(false, false); 9488 } 9489 9490 mLeft += offset; 9491 mRight += offset; 9492 if (mDisplayList != null) { 9493 mDisplayList.offsetLeftRight(offset); 9494 invalidateViewProperty(false, false); 9495 } else { 9496 if (!matrixIsIdentity) { 9497 invalidateViewProperty(false, true); 9498 } 9499 invalidateParentIfNeeded(); 9500 } 9501 } 9502 } 9503 9504 /** 9505 * Get the LayoutParams associated with this view. All views should have 9506 * layout parameters. These supply parameters to the <i>parent</i> of this 9507 * view specifying how it should be arranged. There are many subclasses of 9508 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9509 * of ViewGroup that are responsible for arranging their children. 9510 * 9511 * This method may return null if this View is not attached to a parent 9512 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9513 * was not invoked successfully. When a View is attached to a parent 9514 * ViewGroup, this method must not return null. 9515 * 9516 * @return The LayoutParams associated with this view, or null if no 9517 * parameters have been set yet 9518 */ 9519 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9520 public ViewGroup.LayoutParams getLayoutParams() { 9521 return mLayoutParams; 9522 } 9523 9524 /** 9525 * Set the layout parameters associated with this view. These supply 9526 * parameters to the <i>parent</i> of this view specifying how it should be 9527 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9528 * correspond to the different subclasses of ViewGroup that are responsible 9529 * for arranging their children. 9530 * 9531 * @param params The layout parameters for this view, cannot be null 9532 */ 9533 public void setLayoutParams(ViewGroup.LayoutParams params) { 9534 if (params == null) { 9535 throw new NullPointerException("Layout parameters cannot be null"); 9536 } 9537 mLayoutParams = params; 9538 if (mParent instanceof ViewGroup) { 9539 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9540 } 9541 requestLayout(); 9542 } 9543 9544 /** 9545 * Set the scrolled position of your view. This will cause a call to 9546 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9547 * invalidated. 9548 * @param x the x position to scroll to 9549 * @param y the y position to scroll to 9550 */ 9551 public void scrollTo(int x, int y) { 9552 if (mScrollX != x || mScrollY != y) { 9553 int oldX = mScrollX; 9554 int oldY = mScrollY; 9555 mScrollX = x; 9556 mScrollY = y; 9557 invalidateParentCaches(); 9558 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9559 if (!awakenScrollBars()) { 9560 postInvalidateOnAnimation(); 9561 } 9562 } 9563 } 9564 9565 /** 9566 * Move the scrolled position of your view. This will cause a call to 9567 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9568 * invalidated. 9569 * @param x the amount of pixels to scroll by horizontally 9570 * @param y the amount of pixels to scroll by vertically 9571 */ 9572 public void scrollBy(int x, int y) { 9573 scrollTo(mScrollX + x, mScrollY + y); 9574 } 9575 9576 /** 9577 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9578 * animation to fade the scrollbars out after a default delay. If a subclass 9579 * provides animated scrolling, the start delay should equal the duration 9580 * of the scrolling animation.</p> 9581 * 9582 * <p>The animation starts only if at least one of the scrollbars is 9583 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9584 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9585 * this method returns true, and false otherwise. If the animation is 9586 * started, this method calls {@link #invalidate()}; in that case the 9587 * caller should not call {@link #invalidate()}.</p> 9588 * 9589 * <p>This method should be invoked every time a subclass directly updates 9590 * the scroll parameters.</p> 9591 * 9592 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9593 * and {@link #scrollTo(int, int)}.</p> 9594 * 9595 * @return true if the animation is played, false otherwise 9596 * 9597 * @see #awakenScrollBars(int) 9598 * @see #scrollBy(int, int) 9599 * @see #scrollTo(int, int) 9600 * @see #isHorizontalScrollBarEnabled() 9601 * @see #isVerticalScrollBarEnabled() 9602 * @see #setHorizontalScrollBarEnabled(boolean) 9603 * @see #setVerticalScrollBarEnabled(boolean) 9604 */ 9605 protected boolean awakenScrollBars() { 9606 return mScrollCache != null && 9607 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9608 } 9609 9610 /** 9611 * Trigger the scrollbars to draw. 9612 * This method differs from awakenScrollBars() only in its default duration. 9613 * initialAwakenScrollBars() will show the scroll bars for longer than 9614 * usual to give the user more of a chance to notice them. 9615 * 9616 * @return true if the animation is played, false otherwise. 9617 */ 9618 private boolean initialAwakenScrollBars() { 9619 return mScrollCache != null && 9620 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9621 } 9622 9623 /** 9624 * <p> 9625 * Trigger the scrollbars to draw. When invoked this method starts an 9626 * animation to fade the scrollbars out after a fixed delay. If a subclass 9627 * provides animated scrolling, the start delay should equal the duration of 9628 * the scrolling animation. 9629 * </p> 9630 * 9631 * <p> 9632 * The animation starts only if at least one of the scrollbars is enabled, 9633 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9634 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9635 * this method returns true, and false otherwise. If the animation is 9636 * started, this method calls {@link #invalidate()}; in that case the caller 9637 * should not call {@link #invalidate()}. 9638 * </p> 9639 * 9640 * <p> 9641 * This method should be invoked everytime a subclass directly updates the 9642 * scroll parameters. 9643 * </p> 9644 * 9645 * @param startDelay the delay, in milliseconds, after which the animation 9646 * should start; when the delay is 0, the animation starts 9647 * immediately 9648 * @return true if the animation is played, false otherwise 9649 * 9650 * @see #scrollBy(int, int) 9651 * @see #scrollTo(int, int) 9652 * @see #isHorizontalScrollBarEnabled() 9653 * @see #isVerticalScrollBarEnabled() 9654 * @see #setHorizontalScrollBarEnabled(boolean) 9655 * @see #setVerticalScrollBarEnabled(boolean) 9656 */ 9657 protected boolean awakenScrollBars(int startDelay) { 9658 return awakenScrollBars(startDelay, true); 9659 } 9660 9661 /** 9662 * <p> 9663 * Trigger the scrollbars to draw. When invoked this method starts an 9664 * animation to fade the scrollbars out after a fixed delay. If a subclass 9665 * provides animated scrolling, the start delay should equal the duration of 9666 * the scrolling animation. 9667 * </p> 9668 * 9669 * <p> 9670 * The animation starts only if at least one of the scrollbars is enabled, 9671 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9672 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9673 * this method returns true, and false otherwise. If the animation is 9674 * started, this method calls {@link #invalidate()} if the invalidate parameter 9675 * is set to true; in that case the caller 9676 * should not call {@link #invalidate()}. 9677 * </p> 9678 * 9679 * <p> 9680 * This method should be invoked everytime a subclass directly updates the 9681 * scroll parameters. 9682 * </p> 9683 * 9684 * @param startDelay the delay, in milliseconds, after which the animation 9685 * should start; when the delay is 0, the animation starts 9686 * immediately 9687 * 9688 * @param invalidate Wheter this method should call invalidate 9689 * 9690 * @return true if the animation is played, false otherwise 9691 * 9692 * @see #scrollBy(int, int) 9693 * @see #scrollTo(int, int) 9694 * @see #isHorizontalScrollBarEnabled() 9695 * @see #isVerticalScrollBarEnabled() 9696 * @see #setHorizontalScrollBarEnabled(boolean) 9697 * @see #setVerticalScrollBarEnabled(boolean) 9698 */ 9699 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9700 final ScrollabilityCache scrollCache = mScrollCache; 9701 9702 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9703 return false; 9704 } 9705 9706 if (scrollCache.scrollBar == null) { 9707 scrollCache.scrollBar = new ScrollBarDrawable(); 9708 } 9709 9710 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9711 9712 if (invalidate) { 9713 // Invalidate to show the scrollbars 9714 postInvalidateOnAnimation(); 9715 } 9716 9717 if (scrollCache.state == ScrollabilityCache.OFF) { 9718 // FIXME: this is copied from WindowManagerService. 9719 // We should get this value from the system when it 9720 // is possible to do so. 9721 final int KEY_REPEAT_FIRST_DELAY = 750; 9722 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9723 } 9724 9725 // Tell mScrollCache when we should start fading. This may 9726 // extend the fade start time if one was already scheduled 9727 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9728 scrollCache.fadeStartTime = fadeStartTime; 9729 scrollCache.state = ScrollabilityCache.ON; 9730 9731 // Schedule our fader to run, unscheduling any old ones first 9732 if (mAttachInfo != null) { 9733 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9734 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9735 } 9736 9737 return true; 9738 } 9739 9740 return false; 9741 } 9742 9743 /** 9744 * Do not invalidate views which are not visible and which are not running an animation. They 9745 * will not get drawn and they should not set dirty flags as if they will be drawn 9746 */ 9747 private boolean skipInvalidate() { 9748 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9749 (!(mParent instanceof ViewGroup) || 9750 !((ViewGroup) mParent).isViewTransitioning(this)); 9751 } 9752 /** 9753 * Mark the area defined by dirty as needing to be drawn. If the view is 9754 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9755 * in the future. This must be called from a UI thread. To call from a non-UI 9756 * thread, call {@link #postInvalidate()}. 9757 * 9758 * WARNING: This method is destructive to dirty. 9759 * @param dirty the rectangle representing the bounds of the dirty region 9760 */ 9761 public void invalidate(Rect dirty) { 9762 if (ViewDebug.TRACE_HIERARCHY) { 9763 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9764 } 9765 9766 if (skipInvalidate()) { 9767 return; 9768 } 9769 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9770 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9771 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9772 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9773 mPrivateFlags |= INVALIDATED; 9774 mPrivateFlags |= DIRTY; 9775 final ViewParent p = mParent; 9776 final AttachInfo ai = mAttachInfo; 9777 //noinspection PointlessBooleanExpression,ConstantConditions 9778 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9779 if (p != null && ai != null && ai.mHardwareAccelerated) { 9780 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9781 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9782 p.invalidateChild(this, null); 9783 return; 9784 } 9785 } 9786 if (p != null && ai != null) { 9787 final int scrollX = mScrollX; 9788 final int scrollY = mScrollY; 9789 final Rect r = ai.mTmpInvalRect; 9790 r.set(dirty.left - scrollX, dirty.top - scrollY, 9791 dirty.right - scrollX, dirty.bottom - scrollY); 9792 mParent.invalidateChild(this, r); 9793 } 9794 } 9795 } 9796 9797 /** 9798 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9799 * The coordinates of the dirty rect are relative to the view. 9800 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9801 * will be called at some point in the future. This must be called from 9802 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9803 * @param l the left position of the dirty region 9804 * @param t the top position of the dirty region 9805 * @param r the right position of the dirty region 9806 * @param b the bottom position of the dirty region 9807 */ 9808 public void invalidate(int l, int t, int r, int b) { 9809 if (ViewDebug.TRACE_HIERARCHY) { 9810 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9811 } 9812 9813 if (skipInvalidate()) { 9814 return; 9815 } 9816 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9817 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9818 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9819 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9820 mPrivateFlags |= INVALIDATED; 9821 mPrivateFlags |= DIRTY; 9822 final ViewParent p = mParent; 9823 final AttachInfo ai = mAttachInfo; 9824 //noinspection PointlessBooleanExpression,ConstantConditions 9825 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9826 if (p != null && ai != null && ai.mHardwareAccelerated) { 9827 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9828 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9829 p.invalidateChild(this, null); 9830 return; 9831 } 9832 } 9833 if (p != null && ai != null && l < r && t < b) { 9834 final int scrollX = mScrollX; 9835 final int scrollY = mScrollY; 9836 final Rect tmpr = ai.mTmpInvalRect; 9837 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9838 p.invalidateChild(this, tmpr); 9839 } 9840 } 9841 } 9842 9843 /** 9844 * Invalidate the whole view. If the view is visible, 9845 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9846 * the future. This must be called from a UI thread. To call from a non-UI thread, 9847 * call {@link #postInvalidate()}. 9848 */ 9849 public void invalidate() { 9850 invalidate(true); 9851 } 9852 9853 /** 9854 * This is where the invalidate() work actually happens. A full invalidate() 9855 * causes the drawing cache to be invalidated, but this function can be called with 9856 * invalidateCache set to false to skip that invalidation step for cases that do not 9857 * need it (for example, a component that remains at the same dimensions with the same 9858 * content). 9859 * 9860 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9861 * well. This is usually true for a full invalidate, but may be set to false if the 9862 * View's contents or dimensions have not changed. 9863 */ 9864 void invalidate(boolean invalidateCache) { 9865 if (ViewDebug.TRACE_HIERARCHY) { 9866 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9867 } 9868 9869 if (skipInvalidate()) { 9870 return; 9871 } 9872 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9873 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9874 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9875 mLastIsOpaque = isOpaque(); 9876 mPrivateFlags &= ~DRAWN; 9877 mPrivateFlags |= DIRTY; 9878 if (invalidateCache) { 9879 mPrivateFlags |= INVALIDATED; 9880 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9881 } 9882 final AttachInfo ai = mAttachInfo; 9883 final ViewParent p = mParent; 9884 //noinspection PointlessBooleanExpression,ConstantConditions 9885 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9886 if (p != null && ai != null && ai.mHardwareAccelerated) { 9887 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9888 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9889 p.invalidateChild(this, null); 9890 return; 9891 } 9892 } 9893 9894 if (p != null && ai != null) { 9895 final Rect r = ai.mTmpInvalRect; 9896 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9897 // Don't call invalidate -- we don't want to internally scroll 9898 // our own bounds 9899 p.invalidateChild(this, r); 9900 } 9901 } 9902 } 9903 9904 /** 9905 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9906 * set any flags or handle all of the cases handled by the default invalidation methods. 9907 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9908 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9909 * walk up the hierarchy, transforming the dirty rect as necessary. 9910 * 9911 * The method also handles normal invalidation logic if display list properties are not 9912 * being used in this view. The invalidateParent and forceRedraw flags are used by that 9913 * backup approach, to handle these cases used in the various property-setting methods. 9914 * 9915 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 9916 * are not being used in this view 9917 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 9918 * list properties are not being used in this view 9919 */ 9920 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 9921 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 9922 if (invalidateParent) { 9923 invalidateParentCaches(); 9924 } 9925 if (forceRedraw) { 9926 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9927 } 9928 invalidate(false); 9929 } else { 9930 final AttachInfo ai = mAttachInfo; 9931 final ViewParent p = mParent; 9932 if (p != null && ai != null) { 9933 final Rect r = ai.mTmpInvalRect; 9934 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9935 if (mParent instanceof ViewGroup) { 9936 ((ViewGroup) mParent).invalidateChildFast(this, r); 9937 } else { 9938 mParent.invalidateChild(this, r); 9939 } 9940 } 9941 } 9942 } 9943 9944 /** 9945 * Utility method to transform a given Rect by the current matrix of this view. 9946 */ 9947 void transformRect(final Rect rect) { 9948 if (!getMatrix().isIdentity()) { 9949 RectF boundingRect = mAttachInfo.mTmpTransformRect; 9950 boundingRect.set(rect); 9951 getMatrix().mapRect(boundingRect); 9952 rect.set((int) (boundingRect.left - 0.5f), 9953 (int) (boundingRect.top - 0.5f), 9954 (int) (boundingRect.right + 0.5f), 9955 (int) (boundingRect.bottom + 0.5f)); 9956 } 9957 } 9958 9959 /** 9960 * Used to indicate that the parent of this view should clear its caches. This functionality 9961 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9962 * which is necessary when various parent-managed properties of the view change, such as 9963 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 9964 * clears the parent caches and does not causes an invalidate event. 9965 * 9966 * @hide 9967 */ 9968 protected void invalidateParentCaches() { 9969 if (mParent instanceof View) { 9970 ((View) mParent).mPrivateFlags |= INVALIDATED; 9971 } 9972 } 9973 9974 /** 9975 * Used to indicate that the parent of this view should be invalidated. This functionality 9976 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9977 * which is necessary when various parent-managed properties of the view change, such as 9978 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 9979 * an invalidation event to the parent. 9980 * 9981 * @hide 9982 */ 9983 protected void invalidateParentIfNeeded() { 9984 if (isHardwareAccelerated() && mParent instanceof View) { 9985 ((View) mParent).invalidate(true); 9986 } 9987 } 9988 9989 /** 9990 * Indicates whether this View is opaque. An opaque View guarantees that it will 9991 * draw all the pixels overlapping its bounds using a fully opaque color. 9992 * 9993 * Subclasses of View should override this method whenever possible to indicate 9994 * whether an instance is opaque. Opaque Views are treated in a special way by 9995 * the View hierarchy, possibly allowing it to perform optimizations during 9996 * invalidate/draw passes. 9997 * 9998 * @return True if this View is guaranteed to be fully opaque, false otherwise. 9999 */ 10000 @ViewDebug.ExportedProperty(category = "drawing") 10001 public boolean isOpaque() { 10002 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10003 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10004 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10005 } 10006 10007 /** 10008 * @hide 10009 */ 10010 protected void computeOpaqueFlags() { 10011 // Opaque if: 10012 // - Has a background 10013 // - Background is opaque 10014 // - Doesn't have scrollbars or scrollbars are inside overlay 10015 10016 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10017 mPrivateFlags |= OPAQUE_BACKGROUND; 10018 } else { 10019 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10020 } 10021 10022 final int flags = mViewFlags; 10023 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10024 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10025 mPrivateFlags |= OPAQUE_SCROLLBARS; 10026 } else { 10027 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10028 } 10029 } 10030 10031 /** 10032 * @hide 10033 */ 10034 protected boolean hasOpaqueScrollbars() { 10035 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10036 } 10037 10038 /** 10039 * @return A handler associated with the thread running the View. This 10040 * handler can be used to pump events in the UI events queue. 10041 */ 10042 public Handler getHandler() { 10043 if (mAttachInfo != null) { 10044 return mAttachInfo.mHandler; 10045 } 10046 return null; 10047 } 10048 10049 /** 10050 * Gets the view root associated with the View. 10051 * @return The view root, or null if none. 10052 * @hide 10053 */ 10054 public ViewRootImpl getViewRootImpl() { 10055 if (mAttachInfo != null) { 10056 return mAttachInfo.mViewRootImpl; 10057 } 10058 return null; 10059 } 10060 10061 /** 10062 * <p>Causes the Runnable to be added to the message queue. 10063 * The runnable will be run on the user interface thread.</p> 10064 * 10065 * <p>This method can be invoked from outside of the UI thread 10066 * only when this View is attached to a window.</p> 10067 * 10068 * @param action The Runnable that will be executed. 10069 * 10070 * @return Returns true if the Runnable was successfully placed in to the 10071 * message queue. Returns false on failure, usually because the 10072 * looper processing the message queue is exiting. 10073 * 10074 * @see #postDelayed 10075 * @see #removeCallbacks 10076 */ 10077 public boolean post(Runnable action) { 10078 final AttachInfo attachInfo = mAttachInfo; 10079 if (attachInfo != null) { 10080 return attachInfo.mHandler.post(action); 10081 } 10082 // Assume that post will succeed later 10083 ViewRootImpl.getRunQueue().post(action); 10084 return true; 10085 } 10086 10087 /** 10088 * <p>Causes the Runnable to be added to the message queue, to be run 10089 * after the specified amount of time elapses. 10090 * The runnable will be run on the user interface thread.</p> 10091 * 10092 * <p>This method can be invoked from outside of the UI thread 10093 * only when this View is attached to a window.</p> 10094 * 10095 * @param action The Runnable that will be executed. 10096 * @param delayMillis The delay (in milliseconds) until the Runnable 10097 * will be executed. 10098 * 10099 * @return true if the Runnable was successfully placed in to the 10100 * message queue. Returns false on failure, usually because the 10101 * looper processing the message queue is exiting. Note that a 10102 * result of true does not mean the Runnable will be processed -- 10103 * if the looper is quit before the delivery time of the message 10104 * occurs then the message will be dropped. 10105 * 10106 * @see #post 10107 * @see #removeCallbacks 10108 */ 10109 public boolean postDelayed(Runnable action, long delayMillis) { 10110 final AttachInfo attachInfo = mAttachInfo; 10111 if (attachInfo != null) { 10112 return attachInfo.mHandler.postDelayed(action, delayMillis); 10113 } 10114 // Assume that post will succeed later 10115 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10116 return true; 10117 } 10118 10119 /** 10120 * <p>Causes the Runnable to execute on the next animation time step. 10121 * The runnable will be run on the user interface thread.</p> 10122 * 10123 * <p>This method can be invoked from outside of the UI thread 10124 * only when this View is attached to a window.</p> 10125 * 10126 * @param action The Runnable that will be executed. 10127 * 10128 * @see #postOnAnimationDelayed 10129 * @see #removeCallbacks 10130 */ 10131 public void postOnAnimation(Runnable action) { 10132 final AttachInfo attachInfo = mAttachInfo; 10133 if (attachInfo != null) { 10134 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10135 Choreographer.CALLBACK_ANIMATION, action, null); 10136 } else { 10137 // Assume that post will succeed later 10138 ViewRootImpl.getRunQueue().post(action); 10139 } 10140 } 10141 10142 /** 10143 * <p>Causes the Runnable to execute on the next animation time step, 10144 * after the specified amount of time elapses. 10145 * The runnable will be run on the user interface thread.</p> 10146 * 10147 * <p>This method can be invoked from outside of the UI thread 10148 * only when this View is attached to a window.</p> 10149 * 10150 * @param action The Runnable that will be executed. 10151 * @param delayMillis The delay (in milliseconds) until the Runnable 10152 * will be executed. 10153 * 10154 * @see #postOnAnimation 10155 * @see #removeCallbacks 10156 */ 10157 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10158 final AttachInfo attachInfo = mAttachInfo; 10159 if (attachInfo != null) { 10160 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10161 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10162 } else { 10163 // Assume that post will succeed later 10164 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10165 } 10166 } 10167 10168 /** 10169 * <p>Removes the specified Runnable from the message queue.</p> 10170 * 10171 * <p>This method can be invoked from outside of the UI thread 10172 * only when this View is attached to a window.</p> 10173 * 10174 * @param action The Runnable to remove from the message handling queue 10175 * 10176 * @return true if this view could ask the Handler to remove the Runnable, 10177 * false otherwise. When the returned value is true, the Runnable 10178 * may or may not have been actually removed from the message queue 10179 * (for instance, if the Runnable was not in the queue already.) 10180 * 10181 * @see #post 10182 * @see #postDelayed 10183 * @see #postOnAnimation 10184 * @see #postOnAnimationDelayed 10185 */ 10186 public boolean removeCallbacks(Runnable action) { 10187 if (action != null) { 10188 final AttachInfo attachInfo = mAttachInfo; 10189 if (attachInfo != null) { 10190 attachInfo.mHandler.removeCallbacks(action); 10191 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10192 Choreographer.CALLBACK_ANIMATION, action, null); 10193 } else { 10194 // Assume that post will succeed later 10195 ViewRootImpl.getRunQueue().removeCallbacks(action); 10196 } 10197 } 10198 return true; 10199 } 10200 10201 /** 10202 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10203 * Use this to invalidate the View from a non-UI thread.</p> 10204 * 10205 * <p>This method can be invoked from outside of the UI thread 10206 * only when this View is attached to a window.</p> 10207 * 10208 * @see #invalidate() 10209 * @see #postInvalidateDelayed(long) 10210 */ 10211 public void postInvalidate() { 10212 postInvalidateDelayed(0); 10213 } 10214 10215 /** 10216 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10217 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10218 * 10219 * <p>This method can be invoked from outside of the UI thread 10220 * only when this View is attached to a window.</p> 10221 * 10222 * @param left The left coordinate of the rectangle to invalidate. 10223 * @param top The top coordinate of the rectangle to invalidate. 10224 * @param right The right coordinate of the rectangle to invalidate. 10225 * @param bottom The bottom coordinate of the rectangle to invalidate. 10226 * 10227 * @see #invalidate(int, int, int, int) 10228 * @see #invalidate(Rect) 10229 * @see #postInvalidateDelayed(long, int, int, int, int) 10230 */ 10231 public void postInvalidate(int left, int top, int right, int bottom) { 10232 postInvalidateDelayed(0, left, top, right, bottom); 10233 } 10234 10235 /** 10236 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10237 * loop. Waits for the specified amount of time.</p> 10238 * 10239 * <p>This method can be invoked from outside of the UI thread 10240 * only when this View is attached to a window.</p> 10241 * 10242 * @param delayMilliseconds the duration in milliseconds to delay the 10243 * invalidation by 10244 * 10245 * @see #invalidate() 10246 * @see #postInvalidate() 10247 */ 10248 public void postInvalidateDelayed(long delayMilliseconds) { 10249 // We try only with the AttachInfo because there's no point in invalidating 10250 // if we are not attached to our window 10251 final AttachInfo attachInfo = mAttachInfo; 10252 if (attachInfo != null) { 10253 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10254 } 10255 } 10256 10257 /** 10258 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10259 * through the event loop. Waits for the specified amount of time.</p> 10260 * 10261 * <p>This method can be invoked from outside of the UI thread 10262 * only when this View is attached to a window.</p> 10263 * 10264 * @param delayMilliseconds the duration in milliseconds to delay the 10265 * invalidation by 10266 * @param left The left coordinate of the rectangle to invalidate. 10267 * @param top The top coordinate of the rectangle to invalidate. 10268 * @param right The right coordinate of the rectangle to invalidate. 10269 * @param bottom The bottom coordinate of the rectangle to invalidate. 10270 * 10271 * @see #invalidate(int, int, int, int) 10272 * @see #invalidate(Rect) 10273 * @see #postInvalidate(int, int, int, int) 10274 */ 10275 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10276 int right, int bottom) { 10277 10278 // We try only with the AttachInfo because there's no point in invalidating 10279 // if we are not attached to our window 10280 final AttachInfo attachInfo = mAttachInfo; 10281 if (attachInfo != null) { 10282 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10283 info.target = this; 10284 info.left = left; 10285 info.top = top; 10286 info.right = right; 10287 info.bottom = bottom; 10288 10289 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10290 } 10291 } 10292 10293 /** 10294 * <p>Cause an invalidate to happen on the next animation time step, typically the 10295 * next display frame.</p> 10296 * 10297 * <p>This method can be invoked from outside of the UI thread 10298 * only when this View is attached to a window.</p> 10299 * 10300 * @see #invalidate() 10301 */ 10302 public void postInvalidateOnAnimation() { 10303 // We try only with the AttachInfo because there's no point in invalidating 10304 // if we are not attached to our window 10305 final AttachInfo attachInfo = mAttachInfo; 10306 if (attachInfo != null) { 10307 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10308 } 10309 } 10310 10311 /** 10312 * <p>Cause an invalidate of the specified area to happen on the next animation 10313 * time step, typically the next display frame.</p> 10314 * 10315 * <p>This method can be invoked from outside of the UI thread 10316 * only when this View is attached to a window.</p> 10317 * 10318 * @param left The left coordinate of the rectangle to invalidate. 10319 * @param top The top coordinate of the rectangle to invalidate. 10320 * @param right The right coordinate of the rectangle to invalidate. 10321 * @param bottom The bottom coordinate of the rectangle to invalidate. 10322 * 10323 * @see #invalidate(int, int, int, int) 10324 * @see #invalidate(Rect) 10325 */ 10326 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10327 // We try only with the AttachInfo because there's no point in invalidating 10328 // if we are not attached to our window 10329 final AttachInfo attachInfo = mAttachInfo; 10330 if (attachInfo != null) { 10331 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10332 info.target = this; 10333 info.left = left; 10334 info.top = top; 10335 info.right = right; 10336 info.bottom = bottom; 10337 10338 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10339 } 10340 } 10341 10342 /** 10343 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10344 * This event is sent at most once every 10345 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10346 */ 10347 private void postSendViewScrolledAccessibilityEventCallback() { 10348 if (mSendViewScrolledAccessibilityEvent == null) { 10349 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10350 } 10351 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10352 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10353 postDelayed(mSendViewScrolledAccessibilityEvent, 10354 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10355 } 10356 } 10357 10358 /** 10359 * Called by a parent to request that a child update its values for mScrollX 10360 * and mScrollY if necessary. This will typically be done if the child is 10361 * animating a scroll using a {@link android.widget.Scroller Scroller} 10362 * object. 10363 */ 10364 public void computeScroll() { 10365 } 10366 10367 /** 10368 * <p>Indicate whether the horizontal edges are faded when the view is 10369 * scrolled horizontally.</p> 10370 * 10371 * @return true if the horizontal edges should are faded on scroll, false 10372 * otherwise 10373 * 10374 * @see #setHorizontalFadingEdgeEnabled(boolean) 10375 * 10376 * @attr ref android.R.styleable#View_requiresFadingEdge 10377 */ 10378 public boolean isHorizontalFadingEdgeEnabled() { 10379 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10380 } 10381 10382 /** 10383 * <p>Define whether the horizontal edges should be faded when this view 10384 * is scrolled horizontally.</p> 10385 * 10386 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10387 * be faded when the view is scrolled 10388 * horizontally 10389 * 10390 * @see #isHorizontalFadingEdgeEnabled() 10391 * 10392 * @attr ref android.R.styleable#View_requiresFadingEdge 10393 */ 10394 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10395 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10396 if (horizontalFadingEdgeEnabled) { 10397 initScrollCache(); 10398 } 10399 10400 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10401 } 10402 } 10403 10404 /** 10405 * <p>Indicate whether the vertical edges are faded when the view is 10406 * scrolled horizontally.</p> 10407 * 10408 * @return true if the vertical edges should are faded on scroll, false 10409 * otherwise 10410 * 10411 * @see #setVerticalFadingEdgeEnabled(boolean) 10412 * 10413 * @attr ref android.R.styleable#View_requiresFadingEdge 10414 */ 10415 public boolean isVerticalFadingEdgeEnabled() { 10416 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10417 } 10418 10419 /** 10420 * <p>Define whether the vertical edges should be faded when this view 10421 * is scrolled vertically.</p> 10422 * 10423 * @param verticalFadingEdgeEnabled true if the vertical edges should 10424 * be faded when the view is scrolled 10425 * vertically 10426 * 10427 * @see #isVerticalFadingEdgeEnabled() 10428 * 10429 * @attr ref android.R.styleable#View_requiresFadingEdge 10430 */ 10431 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10432 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10433 if (verticalFadingEdgeEnabled) { 10434 initScrollCache(); 10435 } 10436 10437 mViewFlags ^= FADING_EDGE_VERTICAL; 10438 } 10439 } 10440 10441 /** 10442 * Returns the strength, or intensity, of the top faded edge. The strength is 10443 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10444 * returns 0.0 or 1.0 but no value in between. 10445 * 10446 * Subclasses should override this method to provide a smoother fade transition 10447 * when scrolling occurs. 10448 * 10449 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10450 */ 10451 protected float getTopFadingEdgeStrength() { 10452 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10453 } 10454 10455 /** 10456 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10457 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10458 * returns 0.0 or 1.0 but no value in between. 10459 * 10460 * Subclasses should override this method to provide a smoother fade transition 10461 * when scrolling occurs. 10462 * 10463 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10464 */ 10465 protected float getBottomFadingEdgeStrength() { 10466 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10467 computeVerticalScrollRange() ? 1.0f : 0.0f; 10468 } 10469 10470 /** 10471 * Returns the strength, or intensity, of the left faded edge. The strength is 10472 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10473 * returns 0.0 or 1.0 but no value in between. 10474 * 10475 * Subclasses should override this method to provide a smoother fade transition 10476 * when scrolling occurs. 10477 * 10478 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10479 */ 10480 protected float getLeftFadingEdgeStrength() { 10481 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10482 } 10483 10484 /** 10485 * Returns the strength, or intensity, of the right faded edge. The strength is 10486 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10487 * returns 0.0 or 1.0 but no value in between. 10488 * 10489 * Subclasses should override this method to provide a smoother fade transition 10490 * when scrolling occurs. 10491 * 10492 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10493 */ 10494 protected float getRightFadingEdgeStrength() { 10495 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10496 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10497 } 10498 10499 /** 10500 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10501 * scrollbar is not drawn by default.</p> 10502 * 10503 * @return true if the horizontal scrollbar should be painted, false 10504 * otherwise 10505 * 10506 * @see #setHorizontalScrollBarEnabled(boolean) 10507 */ 10508 public boolean isHorizontalScrollBarEnabled() { 10509 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10510 } 10511 10512 /** 10513 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10514 * scrollbar is not drawn by default.</p> 10515 * 10516 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10517 * be painted 10518 * 10519 * @see #isHorizontalScrollBarEnabled() 10520 */ 10521 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10522 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10523 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10524 computeOpaqueFlags(); 10525 resolvePadding(); 10526 } 10527 } 10528 10529 /** 10530 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10531 * scrollbar is not drawn by default.</p> 10532 * 10533 * @return true if the vertical scrollbar should be painted, false 10534 * otherwise 10535 * 10536 * @see #setVerticalScrollBarEnabled(boolean) 10537 */ 10538 public boolean isVerticalScrollBarEnabled() { 10539 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10540 } 10541 10542 /** 10543 * <p>Define whether the vertical scrollbar should be drawn or not. The 10544 * scrollbar is not drawn by default.</p> 10545 * 10546 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10547 * be painted 10548 * 10549 * @see #isVerticalScrollBarEnabled() 10550 */ 10551 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10552 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10553 mViewFlags ^= SCROLLBARS_VERTICAL; 10554 computeOpaqueFlags(); 10555 resolvePadding(); 10556 } 10557 } 10558 10559 /** 10560 * @hide 10561 */ 10562 protected void recomputePadding() { 10563 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10564 } 10565 10566 /** 10567 * Define whether scrollbars will fade when the view is not scrolling. 10568 * 10569 * @param fadeScrollbars wheter to enable fading 10570 * 10571 * @attr ref android.R.styleable#View_fadeScrollbars 10572 */ 10573 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10574 initScrollCache(); 10575 final ScrollabilityCache scrollabilityCache = mScrollCache; 10576 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10577 if (fadeScrollbars) { 10578 scrollabilityCache.state = ScrollabilityCache.OFF; 10579 } else { 10580 scrollabilityCache.state = ScrollabilityCache.ON; 10581 } 10582 } 10583 10584 /** 10585 * 10586 * Returns true if scrollbars will fade when this view is not scrolling 10587 * 10588 * @return true if scrollbar fading is enabled 10589 * 10590 * @attr ref android.R.styleable#View_fadeScrollbars 10591 */ 10592 public boolean isScrollbarFadingEnabled() { 10593 return mScrollCache != null && mScrollCache.fadeScrollBars; 10594 } 10595 10596 /** 10597 * 10598 * Returns the delay before scrollbars fade. 10599 * 10600 * @return the delay before scrollbars fade 10601 * 10602 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10603 */ 10604 public int getScrollBarDefaultDelayBeforeFade() { 10605 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10606 mScrollCache.scrollBarDefaultDelayBeforeFade; 10607 } 10608 10609 /** 10610 * Define the delay before scrollbars fade. 10611 * 10612 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10613 * 10614 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10615 */ 10616 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10617 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10618 } 10619 10620 /** 10621 * 10622 * Returns the scrollbar fade duration. 10623 * 10624 * @return the scrollbar fade duration 10625 * 10626 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10627 */ 10628 public int getScrollBarFadeDuration() { 10629 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10630 mScrollCache.scrollBarFadeDuration; 10631 } 10632 10633 /** 10634 * Define the scrollbar fade duration. 10635 * 10636 * @param scrollBarFadeDuration - the scrollbar fade duration 10637 * 10638 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10639 */ 10640 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10641 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10642 } 10643 10644 /** 10645 * 10646 * Returns the scrollbar size. 10647 * 10648 * @return the scrollbar size 10649 * 10650 * @attr ref android.R.styleable#View_scrollbarSize 10651 */ 10652 public int getScrollBarSize() { 10653 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10654 mScrollCache.scrollBarSize; 10655 } 10656 10657 /** 10658 * Define the scrollbar size. 10659 * 10660 * @param scrollBarSize - the scrollbar size 10661 * 10662 * @attr ref android.R.styleable#View_scrollbarSize 10663 */ 10664 public void setScrollBarSize(int scrollBarSize) { 10665 getScrollCache().scrollBarSize = scrollBarSize; 10666 } 10667 10668 /** 10669 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10670 * inset. When inset, they add to the padding of the view. And the scrollbars 10671 * can be drawn inside the padding area or on the edge of the view. For example, 10672 * if a view has a background drawable and you want to draw the scrollbars 10673 * inside the padding specified by the drawable, you can use 10674 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10675 * appear at the edge of the view, ignoring the padding, then you can use 10676 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10677 * @param style the style of the scrollbars. Should be one of 10678 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10679 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10680 * @see #SCROLLBARS_INSIDE_OVERLAY 10681 * @see #SCROLLBARS_INSIDE_INSET 10682 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10683 * @see #SCROLLBARS_OUTSIDE_INSET 10684 * 10685 * @attr ref android.R.styleable#View_scrollbarStyle 10686 */ 10687 public void setScrollBarStyle(int style) { 10688 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10689 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10690 computeOpaqueFlags(); 10691 resolvePadding(); 10692 } 10693 } 10694 10695 /** 10696 * <p>Returns the current scrollbar style.</p> 10697 * @return the current scrollbar style 10698 * @see #SCROLLBARS_INSIDE_OVERLAY 10699 * @see #SCROLLBARS_INSIDE_INSET 10700 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10701 * @see #SCROLLBARS_OUTSIDE_INSET 10702 * 10703 * @attr ref android.R.styleable#View_scrollbarStyle 10704 */ 10705 @ViewDebug.ExportedProperty(mapping = { 10706 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10707 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10708 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10709 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10710 }) 10711 public int getScrollBarStyle() { 10712 return mViewFlags & SCROLLBARS_STYLE_MASK; 10713 } 10714 10715 /** 10716 * <p>Compute the horizontal range that the horizontal scrollbar 10717 * represents.</p> 10718 * 10719 * <p>The range is expressed in arbitrary units that must be the same as the 10720 * units used by {@link #computeHorizontalScrollExtent()} and 10721 * {@link #computeHorizontalScrollOffset()}.</p> 10722 * 10723 * <p>The default range is the drawing width of this view.</p> 10724 * 10725 * @return the total horizontal range represented by the horizontal 10726 * scrollbar 10727 * 10728 * @see #computeHorizontalScrollExtent() 10729 * @see #computeHorizontalScrollOffset() 10730 * @see android.widget.ScrollBarDrawable 10731 */ 10732 protected int computeHorizontalScrollRange() { 10733 return getWidth(); 10734 } 10735 10736 /** 10737 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10738 * within the horizontal range. This value is used to compute the position 10739 * of the thumb within the scrollbar's track.</p> 10740 * 10741 * <p>The range is expressed in arbitrary units that must be the same as the 10742 * units used by {@link #computeHorizontalScrollRange()} and 10743 * {@link #computeHorizontalScrollExtent()}.</p> 10744 * 10745 * <p>The default offset is the scroll offset of this view.</p> 10746 * 10747 * @return the horizontal offset of the scrollbar's thumb 10748 * 10749 * @see #computeHorizontalScrollRange() 10750 * @see #computeHorizontalScrollExtent() 10751 * @see android.widget.ScrollBarDrawable 10752 */ 10753 protected int computeHorizontalScrollOffset() { 10754 return mScrollX; 10755 } 10756 10757 /** 10758 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10759 * within the horizontal range. This value is used to compute the length 10760 * of the thumb within the scrollbar's track.</p> 10761 * 10762 * <p>The range is expressed in arbitrary units that must be the same as the 10763 * units used by {@link #computeHorizontalScrollRange()} and 10764 * {@link #computeHorizontalScrollOffset()}.</p> 10765 * 10766 * <p>The default extent is the drawing width of this view.</p> 10767 * 10768 * @return the horizontal extent of the scrollbar's thumb 10769 * 10770 * @see #computeHorizontalScrollRange() 10771 * @see #computeHorizontalScrollOffset() 10772 * @see android.widget.ScrollBarDrawable 10773 */ 10774 protected int computeHorizontalScrollExtent() { 10775 return getWidth(); 10776 } 10777 10778 /** 10779 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10780 * 10781 * <p>The range is expressed in arbitrary units that must be the same as the 10782 * units used by {@link #computeVerticalScrollExtent()} and 10783 * {@link #computeVerticalScrollOffset()}.</p> 10784 * 10785 * @return the total vertical range represented by the vertical scrollbar 10786 * 10787 * <p>The default range is the drawing height of this view.</p> 10788 * 10789 * @see #computeVerticalScrollExtent() 10790 * @see #computeVerticalScrollOffset() 10791 * @see android.widget.ScrollBarDrawable 10792 */ 10793 protected int computeVerticalScrollRange() { 10794 return getHeight(); 10795 } 10796 10797 /** 10798 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10799 * within the horizontal range. This value is used to compute the position 10800 * of the thumb within the scrollbar's track.</p> 10801 * 10802 * <p>The range is expressed in arbitrary units that must be the same as the 10803 * units used by {@link #computeVerticalScrollRange()} and 10804 * {@link #computeVerticalScrollExtent()}.</p> 10805 * 10806 * <p>The default offset is the scroll offset of this view.</p> 10807 * 10808 * @return the vertical offset of the scrollbar's thumb 10809 * 10810 * @see #computeVerticalScrollRange() 10811 * @see #computeVerticalScrollExtent() 10812 * @see android.widget.ScrollBarDrawable 10813 */ 10814 protected int computeVerticalScrollOffset() { 10815 return mScrollY; 10816 } 10817 10818 /** 10819 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10820 * within the vertical range. This value is used to compute the length 10821 * of the thumb within the scrollbar's track.</p> 10822 * 10823 * <p>The range is expressed in arbitrary units that must be the same as the 10824 * units used by {@link #computeVerticalScrollRange()} and 10825 * {@link #computeVerticalScrollOffset()}.</p> 10826 * 10827 * <p>The default extent is the drawing height of this view.</p> 10828 * 10829 * @return the vertical extent of the scrollbar's thumb 10830 * 10831 * @see #computeVerticalScrollRange() 10832 * @see #computeVerticalScrollOffset() 10833 * @see android.widget.ScrollBarDrawable 10834 */ 10835 protected int computeVerticalScrollExtent() { 10836 return getHeight(); 10837 } 10838 10839 /** 10840 * Check if this view can be scrolled horizontally in a certain direction. 10841 * 10842 * @param direction Negative to check scrolling left, positive to check scrolling right. 10843 * @return true if this view can be scrolled in the specified direction, false otherwise. 10844 */ 10845 public boolean canScrollHorizontally(int direction) { 10846 final int offset = computeHorizontalScrollOffset(); 10847 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10848 if (range == 0) return false; 10849 if (direction < 0) { 10850 return offset > 0; 10851 } else { 10852 return offset < range - 1; 10853 } 10854 } 10855 10856 /** 10857 * Check if this view can be scrolled vertically in a certain direction. 10858 * 10859 * @param direction Negative to check scrolling up, positive to check scrolling down. 10860 * @return true if this view can be scrolled in the specified direction, false otherwise. 10861 */ 10862 public boolean canScrollVertically(int direction) { 10863 final int offset = computeVerticalScrollOffset(); 10864 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10865 if (range == 0) return false; 10866 if (direction < 0) { 10867 return offset > 0; 10868 } else { 10869 return offset < range - 1; 10870 } 10871 } 10872 10873 /** 10874 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10875 * scrollbars are painted only if they have been awakened first.</p> 10876 * 10877 * @param canvas the canvas on which to draw the scrollbars 10878 * 10879 * @see #awakenScrollBars(int) 10880 */ 10881 protected final void onDrawScrollBars(Canvas canvas) { 10882 // scrollbars are drawn only when the animation is running 10883 final ScrollabilityCache cache = mScrollCache; 10884 if (cache != null) { 10885 10886 int state = cache.state; 10887 10888 if (state == ScrollabilityCache.OFF) { 10889 return; 10890 } 10891 10892 boolean invalidate = false; 10893 10894 if (state == ScrollabilityCache.FADING) { 10895 // We're fading -- get our fade interpolation 10896 if (cache.interpolatorValues == null) { 10897 cache.interpolatorValues = new float[1]; 10898 } 10899 10900 float[] values = cache.interpolatorValues; 10901 10902 // Stops the animation if we're done 10903 if (cache.scrollBarInterpolator.timeToValues(values) == 10904 Interpolator.Result.FREEZE_END) { 10905 cache.state = ScrollabilityCache.OFF; 10906 } else { 10907 cache.scrollBar.setAlpha(Math.round(values[0])); 10908 } 10909 10910 // This will make the scroll bars inval themselves after 10911 // drawing. We only want this when we're fading so that 10912 // we prevent excessive redraws 10913 invalidate = true; 10914 } else { 10915 // We're just on -- but we may have been fading before so 10916 // reset alpha 10917 cache.scrollBar.setAlpha(255); 10918 } 10919 10920 10921 final int viewFlags = mViewFlags; 10922 10923 final boolean drawHorizontalScrollBar = 10924 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10925 final boolean drawVerticalScrollBar = 10926 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 10927 && !isVerticalScrollBarHidden(); 10928 10929 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 10930 final int width = mRight - mLeft; 10931 final int height = mBottom - mTop; 10932 10933 final ScrollBarDrawable scrollBar = cache.scrollBar; 10934 10935 final int scrollX = mScrollX; 10936 final int scrollY = mScrollY; 10937 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 10938 10939 int left, top, right, bottom; 10940 10941 if (drawHorizontalScrollBar) { 10942 int size = scrollBar.getSize(false); 10943 if (size <= 0) { 10944 size = cache.scrollBarSize; 10945 } 10946 10947 scrollBar.setParameters(computeHorizontalScrollRange(), 10948 computeHorizontalScrollOffset(), 10949 computeHorizontalScrollExtent(), false); 10950 final int verticalScrollBarGap = drawVerticalScrollBar ? 10951 getVerticalScrollbarWidth() : 0; 10952 top = scrollY + height - size - (mUserPaddingBottom & inside); 10953 left = scrollX + (mPaddingLeft & inside); 10954 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 10955 bottom = top + size; 10956 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 10957 if (invalidate) { 10958 invalidate(left, top, right, bottom); 10959 } 10960 } 10961 10962 if (drawVerticalScrollBar) { 10963 int size = scrollBar.getSize(true); 10964 if (size <= 0) { 10965 size = cache.scrollBarSize; 10966 } 10967 10968 scrollBar.setParameters(computeVerticalScrollRange(), 10969 computeVerticalScrollOffset(), 10970 computeVerticalScrollExtent(), true); 10971 switch (mVerticalScrollbarPosition) { 10972 default: 10973 case SCROLLBAR_POSITION_DEFAULT: 10974 case SCROLLBAR_POSITION_RIGHT: 10975 left = scrollX + width - size - (mUserPaddingRight & inside); 10976 break; 10977 case SCROLLBAR_POSITION_LEFT: 10978 left = scrollX + (mUserPaddingLeft & inside); 10979 break; 10980 } 10981 top = scrollY + (mPaddingTop & inside); 10982 right = left + size; 10983 bottom = scrollY + height - (mUserPaddingBottom & inside); 10984 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 10985 if (invalidate) { 10986 invalidate(left, top, right, bottom); 10987 } 10988 } 10989 } 10990 } 10991 } 10992 10993 /** 10994 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 10995 * FastScroller is visible. 10996 * @return whether to temporarily hide the vertical scrollbar 10997 * @hide 10998 */ 10999 protected boolean isVerticalScrollBarHidden() { 11000 return false; 11001 } 11002 11003 /** 11004 * <p>Draw the horizontal scrollbar if 11005 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11006 * 11007 * @param canvas the canvas on which to draw the scrollbar 11008 * @param scrollBar the scrollbar's drawable 11009 * 11010 * @see #isHorizontalScrollBarEnabled() 11011 * @see #computeHorizontalScrollRange() 11012 * @see #computeHorizontalScrollExtent() 11013 * @see #computeHorizontalScrollOffset() 11014 * @see android.widget.ScrollBarDrawable 11015 * @hide 11016 */ 11017 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11018 int l, int t, int r, int b) { 11019 scrollBar.setBounds(l, t, r, b); 11020 scrollBar.draw(canvas); 11021 } 11022 11023 /** 11024 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11025 * returns true.</p> 11026 * 11027 * @param canvas the canvas on which to draw the scrollbar 11028 * @param scrollBar the scrollbar's drawable 11029 * 11030 * @see #isVerticalScrollBarEnabled() 11031 * @see #computeVerticalScrollRange() 11032 * @see #computeVerticalScrollExtent() 11033 * @see #computeVerticalScrollOffset() 11034 * @see android.widget.ScrollBarDrawable 11035 * @hide 11036 */ 11037 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11038 int l, int t, int r, int b) { 11039 scrollBar.setBounds(l, t, r, b); 11040 scrollBar.draw(canvas); 11041 } 11042 11043 /** 11044 * Implement this to do your drawing. 11045 * 11046 * @param canvas the canvas on which the background will be drawn 11047 */ 11048 protected void onDraw(Canvas canvas) { 11049 } 11050 11051 /* 11052 * Caller is responsible for calling requestLayout if necessary. 11053 * (This allows addViewInLayout to not request a new layout.) 11054 */ 11055 void assignParent(ViewParent parent) { 11056 if (mParent == null) { 11057 mParent = parent; 11058 } else if (parent == null) { 11059 mParent = null; 11060 } else { 11061 throw new RuntimeException("view " + this + " being added, but" 11062 + " it already has a parent"); 11063 } 11064 } 11065 11066 /** 11067 * This is called when the view is attached to a window. At this point it 11068 * has a Surface and will start drawing. Note that this function is 11069 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11070 * however it may be called any time before the first onDraw -- including 11071 * before or after {@link #onMeasure(int, int)}. 11072 * 11073 * @see #onDetachedFromWindow() 11074 */ 11075 protected void onAttachedToWindow() { 11076 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11077 mParent.requestTransparentRegion(this); 11078 } 11079 11080 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11081 initialAwakenScrollBars(); 11082 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11083 } 11084 11085 jumpDrawablesToCurrentState(); 11086 11087 // Order is important here: LayoutDirection MUST be resolved before Padding 11088 // and TextDirection 11089 resolveLayoutDirection(); 11090 resolvePadding(); 11091 resolveTextDirection(); 11092 resolveTextAlignment(); 11093 11094 clearAccessibilityFocus(); 11095 if (isFocused()) { 11096 InputMethodManager imm = InputMethodManager.peekInstance(); 11097 imm.focusIn(this); 11098 } 11099 11100 if (mAttachInfo != null && mDisplayList != null) { 11101 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11102 } 11103 } 11104 11105 /** 11106 * @see #onScreenStateChanged(int) 11107 */ 11108 void dispatchScreenStateChanged(int screenState) { 11109 onScreenStateChanged(screenState); 11110 } 11111 11112 /** 11113 * This method is called whenever the state of the screen this view is 11114 * attached to changes. A state change will usually occurs when the screen 11115 * turns on or off (whether it happens automatically or the user does it 11116 * manually.) 11117 * 11118 * @param screenState The new state of the screen. Can be either 11119 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11120 */ 11121 public void onScreenStateChanged(int screenState) { 11122 } 11123 11124 /** 11125 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11126 */ 11127 private boolean hasRtlSupport() { 11128 return mContext.getApplicationInfo().hasRtlSupport(); 11129 } 11130 11131 /** 11132 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11133 * that the parent directionality can and will be resolved before its children. 11134 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11135 */ 11136 public void resolveLayoutDirection() { 11137 // Clear any previous layout direction resolution 11138 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11139 11140 if (hasRtlSupport()) { 11141 // Set resolved depending on layout direction 11142 switch (getLayoutDirection()) { 11143 case LAYOUT_DIRECTION_INHERIT: 11144 // If this is root view, no need to look at parent's layout dir. 11145 if (canResolveLayoutDirection()) { 11146 ViewGroup viewGroup = ((ViewGroup) mParent); 11147 11148 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11149 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11150 } 11151 } else { 11152 // Nothing to do, LTR by default 11153 } 11154 break; 11155 case LAYOUT_DIRECTION_RTL: 11156 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11157 break; 11158 case LAYOUT_DIRECTION_LOCALE: 11159 if(isLayoutDirectionRtl(Locale.getDefault())) { 11160 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11161 } 11162 break; 11163 default: 11164 // Nothing to do, LTR by default 11165 } 11166 } 11167 11168 // Set to resolved 11169 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11170 onResolvedLayoutDirectionChanged(); 11171 // Resolve padding 11172 resolvePadding(); 11173 } 11174 11175 /** 11176 * Called when layout direction has been resolved. 11177 * 11178 * The default implementation does nothing. 11179 */ 11180 public void onResolvedLayoutDirectionChanged() { 11181 } 11182 11183 /** 11184 * Resolve padding depending on layout direction. 11185 */ 11186 public void resolvePadding() { 11187 // If the user specified the absolute padding (either with android:padding or 11188 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11189 // use the default padding or the padding from the background drawable 11190 // (stored at this point in mPadding*) 11191 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11192 switch (resolvedLayoutDirection) { 11193 case LAYOUT_DIRECTION_RTL: 11194 // Start user padding override Right user padding. Otherwise, if Right user 11195 // padding is not defined, use the default Right padding. If Right user padding 11196 // is defined, just use it. 11197 if (mUserPaddingStart >= 0) { 11198 mUserPaddingRight = mUserPaddingStart; 11199 } else if (mUserPaddingRight < 0) { 11200 mUserPaddingRight = mPaddingRight; 11201 } 11202 if (mUserPaddingEnd >= 0) { 11203 mUserPaddingLeft = mUserPaddingEnd; 11204 } else if (mUserPaddingLeft < 0) { 11205 mUserPaddingLeft = mPaddingLeft; 11206 } 11207 break; 11208 case LAYOUT_DIRECTION_LTR: 11209 default: 11210 // Start user padding override Left user padding. Otherwise, if Left user 11211 // padding is not defined, use the default left padding. If Left user padding 11212 // is defined, just use it. 11213 if (mUserPaddingStart >= 0) { 11214 mUserPaddingLeft = mUserPaddingStart; 11215 } else if (mUserPaddingLeft < 0) { 11216 mUserPaddingLeft = mPaddingLeft; 11217 } 11218 if (mUserPaddingEnd >= 0) { 11219 mUserPaddingRight = mUserPaddingEnd; 11220 } else if (mUserPaddingRight < 0) { 11221 mUserPaddingRight = mPaddingRight; 11222 } 11223 } 11224 11225 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11226 11227 if(isPaddingRelative()) { 11228 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11229 } else { 11230 recomputePadding(); 11231 } 11232 onPaddingChanged(resolvedLayoutDirection); 11233 } 11234 11235 /** 11236 * Resolve padding depending on the layout direction. Subclasses that care about 11237 * padding resolution should override this method. The default implementation does 11238 * nothing. 11239 * 11240 * @param layoutDirection the direction of the layout 11241 * 11242 * @see {@link #LAYOUT_DIRECTION_LTR} 11243 * @see {@link #LAYOUT_DIRECTION_RTL} 11244 */ 11245 public void onPaddingChanged(int layoutDirection) { 11246 } 11247 11248 /** 11249 * Check if layout direction resolution can be done. 11250 * 11251 * @return true if layout direction resolution can be done otherwise return false. 11252 */ 11253 public boolean canResolveLayoutDirection() { 11254 switch (getLayoutDirection()) { 11255 case LAYOUT_DIRECTION_INHERIT: 11256 return (mParent != null) && (mParent instanceof ViewGroup); 11257 default: 11258 return true; 11259 } 11260 } 11261 11262 /** 11263 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11264 * when reset is done. 11265 */ 11266 public void resetResolvedLayoutDirection() { 11267 // Reset the current resolved bits 11268 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11269 onResolvedLayoutDirectionReset(); 11270 // Reset also the text direction 11271 resetResolvedTextDirection(); 11272 } 11273 11274 /** 11275 * Called during reset of resolved layout direction. 11276 * 11277 * Subclasses need to override this method to clear cached information that depends on the 11278 * resolved layout direction, or to inform child views that inherit their layout direction. 11279 * 11280 * The default implementation does nothing. 11281 */ 11282 public void onResolvedLayoutDirectionReset() { 11283 } 11284 11285 /** 11286 * Check if a Locale uses an RTL script. 11287 * 11288 * @param locale Locale to check 11289 * @return true if the Locale uses an RTL script. 11290 */ 11291 protected static boolean isLayoutDirectionRtl(Locale locale) { 11292 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11293 } 11294 11295 /** 11296 * This is called when the view is detached from a window. At this point it 11297 * no longer has a surface for drawing. 11298 * 11299 * @see #onAttachedToWindow() 11300 */ 11301 protected void onDetachedFromWindow() { 11302 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11303 11304 removeUnsetPressCallback(); 11305 removeLongPressCallback(); 11306 removePerformClickCallback(); 11307 removeSendViewScrolledAccessibilityEventCallback(); 11308 11309 destroyDrawingCache(); 11310 11311 destroyLayer(false); 11312 11313 if (mAttachInfo != null) { 11314 if (mDisplayList != null) { 11315 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11316 } 11317 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11318 } else { 11319 if (mDisplayList != null) { 11320 // Should never happen 11321 mDisplayList.invalidate(); 11322 } 11323 } 11324 11325 mCurrentAnimation = null; 11326 11327 resetResolvedLayoutDirection(); 11328 resetResolvedTextAlignment(); 11329 resetAccessibilityStateChanged(); 11330 } 11331 11332 /** 11333 * @return The number of times this view has been attached to a window 11334 */ 11335 protected int getWindowAttachCount() { 11336 return mWindowAttachCount; 11337 } 11338 11339 /** 11340 * Retrieve a unique token identifying the window this view is attached to. 11341 * @return Return the window's token for use in 11342 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11343 */ 11344 public IBinder getWindowToken() { 11345 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11346 } 11347 11348 /** 11349 * Retrieve a unique token identifying the top-level "real" window of 11350 * the window that this view is attached to. That is, this is like 11351 * {@link #getWindowToken}, except if the window this view in is a panel 11352 * window (attached to another containing window), then the token of 11353 * the containing window is returned instead. 11354 * 11355 * @return Returns the associated window token, either 11356 * {@link #getWindowToken()} or the containing window's token. 11357 */ 11358 public IBinder getApplicationWindowToken() { 11359 AttachInfo ai = mAttachInfo; 11360 if (ai != null) { 11361 IBinder appWindowToken = ai.mPanelParentWindowToken; 11362 if (appWindowToken == null) { 11363 appWindowToken = ai.mWindowToken; 11364 } 11365 return appWindowToken; 11366 } 11367 return null; 11368 } 11369 11370 /** 11371 * Retrieve private session object this view hierarchy is using to 11372 * communicate with the window manager. 11373 * @return the session object to communicate with the window manager 11374 */ 11375 /*package*/ IWindowSession getWindowSession() { 11376 return mAttachInfo != null ? mAttachInfo.mSession : null; 11377 } 11378 11379 /** 11380 * @param info the {@link android.view.View.AttachInfo} to associated with 11381 * this view 11382 */ 11383 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11384 //System.out.println("Attached! " + this); 11385 mAttachInfo = info; 11386 mWindowAttachCount++; 11387 // We will need to evaluate the drawable state at least once. 11388 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11389 if (mFloatingTreeObserver != null) { 11390 info.mTreeObserver.merge(mFloatingTreeObserver); 11391 mFloatingTreeObserver = null; 11392 } 11393 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11394 mAttachInfo.mScrollContainers.add(this); 11395 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11396 } 11397 performCollectViewAttributes(mAttachInfo, visibility); 11398 onAttachedToWindow(); 11399 11400 ListenerInfo li = mListenerInfo; 11401 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11402 li != null ? li.mOnAttachStateChangeListeners : null; 11403 if (listeners != null && listeners.size() > 0) { 11404 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11405 // perform the dispatching. The iterator is a safe guard against listeners that 11406 // could mutate the list by calling the various add/remove methods. This prevents 11407 // the array from being modified while we iterate it. 11408 for (OnAttachStateChangeListener listener : listeners) { 11409 listener.onViewAttachedToWindow(this); 11410 } 11411 } 11412 11413 int vis = info.mWindowVisibility; 11414 if (vis != GONE) { 11415 onWindowVisibilityChanged(vis); 11416 } 11417 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11418 // If nobody has evaluated the drawable state yet, then do it now. 11419 refreshDrawableState(); 11420 } 11421 } 11422 11423 void dispatchDetachedFromWindow() { 11424 AttachInfo info = mAttachInfo; 11425 if (info != null) { 11426 int vis = info.mWindowVisibility; 11427 if (vis != GONE) { 11428 onWindowVisibilityChanged(GONE); 11429 } 11430 } 11431 11432 onDetachedFromWindow(); 11433 11434 ListenerInfo li = mListenerInfo; 11435 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11436 li != null ? li.mOnAttachStateChangeListeners : null; 11437 if (listeners != null && listeners.size() > 0) { 11438 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11439 // perform the dispatching. The iterator is a safe guard against listeners that 11440 // could mutate the list by calling the various add/remove methods. This prevents 11441 // the array from being modified while we iterate it. 11442 for (OnAttachStateChangeListener listener : listeners) { 11443 listener.onViewDetachedFromWindow(this); 11444 } 11445 } 11446 11447 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11448 mAttachInfo.mScrollContainers.remove(this); 11449 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11450 } 11451 11452 mAttachInfo = null; 11453 } 11454 11455 /** 11456 * Store this view hierarchy's frozen state into the given container. 11457 * 11458 * @param container The SparseArray in which to save the view's state. 11459 * 11460 * @see #restoreHierarchyState(android.util.SparseArray) 11461 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11462 * @see #onSaveInstanceState() 11463 */ 11464 public void saveHierarchyState(SparseArray<Parcelable> container) { 11465 dispatchSaveInstanceState(container); 11466 } 11467 11468 /** 11469 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11470 * this view and its children. May be overridden to modify how freezing happens to a 11471 * view's children; for example, some views may want to not store state for their children. 11472 * 11473 * @param container The SparseArray in which to save the view's state. 11474 * 11475 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11476 * @see #saveHierarchyState(android.util.SparseArray) 11477 * @see #onSaveInstanceState() 11478 */ 11479 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11480 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11481 mPrivateFlags &= ~SAVE_STATE_CALLED; 11482 Parcelable state = onSaveInstanceState(); 11483 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11484 throw new IllegalStateException( 11485 "Derived class did not call super.onSaveInstanceState()"); 11486 } 11487 if (state != null) { 11488 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11489 // + ": " + state); 11490 container.put(mID, state); 11491 } 11492 } 11493 } 11494 11495 /** 11496 * Hook allowing a view to generate a representation of its internal state 11497 * that can later be used to create a new instance with that same state. 11498 * This state should only contain information that is not persistent or can 11499 * not be reconstructed later. For example, you will never store your 11500 * current position on screen because that will be computed again when a 11501 * new instance of the view is placed in its view hierarchy. 11502 * <p> 11503 * Some examples of things you may store here: the current cursor position 11504 * in a text view (but usually not the text itself since that is stored in a 11505 * content provider or other persistent storage), the currently selected 11506 * item in a list view. 11507 * 11508 * @return Returns a Parcelable object containing the view's current dynamic 11509 * state, or null if there is nothing interesting to save. The 11510 * default implementation returns null. 11511 * @see #onRestoreInstanceState(android.os.Parcelable) 11512 * @see #saveHierarchyState(android.util.SparseArray) 11513 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11514 * @see #setSaveEnabled(boolean) 11515 */ 11516 protected Parcelable onSaveInstanceState() { 11517 mPrivateFlags |= SAVE_STATE_CALLED; 11518 return BaseSavedState.EMPTY_STATE; 11519 } 11520 11521 /** 11522 * Restore this view hierarchy's frozen state from the given container. 11523 * 11524 * @param container The SparseArray which holds previously frozen states. 11525 * 11526 * @see #saveHierarchyState(android.util.SparseArray) 11527 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11528 * @see #onRestoreInstanceState(android.os.Parcelable) 11529 */ 11530 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11531 dispatchRestoreInstanceState(container); 11532 } 11533 11534 /** 11535 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11536 * state for this view and its children. May be overridden to modify how restoring 11537 * happens to a view's children; for example, some views may want to not store state 11538 * for their children. 11539 * 11540 * @param container The SparseArray which holds previously saved state. 11541 * 11542 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11543 * @see #restoreHierarchyState(android.util.SparseArray) 11544 * @see #onRestoreInstanceState(android.os.Parcelable) 11545 */ 11546 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11547 if (mID != NO_ID) { 11548 Parcelable state = container.get(mID); 11549 if (state != null) { 11550 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11551 // + ": " + state); 11552 mPrivateFlags &= ~SAVE_STATE_CALLED; 11553 onRestoreInstanceState(state); 11554 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11555 throw new IllegalStateException( 11556 "Derived class did not call super.onRestoreInstanceState()"); 11557 } 11558 } 11559 } 11560 } 11561 11562 /** 11563 * Hook allowing a view to re-apply a representation of its internal state that had previously 11564 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11565 * null state. 11566 * 11567 * @param state The frozen state that had previously been returned by 11568 * {@link #onSaveInstanceState}. 11569 * 11570 * @see #onSaveInstanceState() 11571 * @see #restoreHierarchyState(android.util.SparseArray) 11572 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11573 */ 11574 protected void onRestoreInstanceState(Parcelable state) { 11575 mPrivateFlags |= SAVE_STATE_CALLED; 11576 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11577 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11578 + "received " + state.getClass().toString() + " instead. This usually happens " 11579 + "when two views of different type have the same id in the same hierarchy. " 11580 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11581 + "other views do not use the same id."); 11582 } 11583 } 11584 11585 /** 11586 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11587 * 11588 * @return the drawing start time in milliseconds 11589 */ 11590 public long getDrawingTime() { 11591 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11592 } 11593 11594 /** 11595 * <p>Enables or disables the duplication of the parent's state into this view. When 11596 * duplication is enabled, this view gets its drawable state from its parent rather 11597 * than from its own internal properties.</p> 11598 * 11599 * <p>Note: in the current implementation, setting this property to true after the 11600 * view was added to a ViewGroup might have no effect at all. This property should 11601 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11602 * 11603 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11604 * property is enabled, an exception will be thrown.</p> 11605 * 11606 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11607 * parent, these states should not be affected by this method.</p> 11608 * 11609 * @param enabled True to enable duplication of the parent's drawable state, false 11610 * to disable it. 11611 * 11612 * @see #getDrawableState() 11613 * @see #isDuplicateParentStateEnabled() 11614 */ 11615 public void setDuplicateParentStateEnabled(boolean enabled) { 11616 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11617 } 11618 11619 /** 11620 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11621 * 11622 * @return True if this view's drawable state is duplicated from the parent, 11623 * false otherwise 11624 * 11625 * @see #getDrawableState() 11626 * @see #setDuplicateParentStateEnabled(boolean) 11627 */ 11628 public boolean isDuplicateParentStateEnabled() { 11629 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11630 } 11631 11632 /** 11633 * <p>Specifies the type of layer backing this view. The layer can be 11634 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11635 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11636 * 11637 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11638 * instance that controls how the layer is composed on screen. The following 11639 * properties of the paint are taken into account when composing the layer:</p> 11640 * <ul> 11641 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11642 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11643 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11644 * </ul> 11645 * 11646 * <p>If this view has an alpha value set to < 1.0 by calling 11647 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11648 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11649 * equivalent to setting a hardware layer on this view and providing a paint with 11650 * the desired alpha value.<p> 11651 * 11652 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11653 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11654 * for more information on when and how to use layers.</p> 11655 * 11656 * @param layerType The ype of layer to use with this view, must be one of 11657 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11658 * {@link #LAYER_TYPE_HARDWARE} 11659 * @param paint The paint used to compose the layer. This argument is optional 11660 * and can be null. It is ignored when the layer type is 11661 * {@link #LAYER_TYPE_NONE} 11662 * 11663 * @see #getLayerType() 11664 * @see #LAYER_TYPE_NONE 11665 * @see #LAYER_TYPE_SOFTWARE 11666 * @see #LAYER_TYPE_HARDWARE 11667 * @see #setAlpha(float) 11668 * 11669 * @attr ref android.R.styleable#View_layerType 11670 */ 11671 public void setLayerType(int layerType, Paint paint) { 11672 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11673 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11674 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11675 } 11676 11677 if (layerType == mLayerType) { 11678 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11679 mLayerPaint = paint == null ? new Paint() : paint; 11680 invalidateParentCaches(); 11681 invalidate(true); 11682 } 11683 return; 11684 } 11685 11686 // Destroy any previous software drawing cache if needed 11687 switch (mLayerType) { 11688 case LAYER_TYPE_HARDWARE: 11689 destroyLayer(false); 11690 // fall through - non-accelerated views may use software layer mechanism instead 11691 case LAYER_TYPE_SOFTWARE: 11692 destroyDrawingCache(); 11693 break; 11694 default: 11695 break; 11696 } 11697 11698 mLayerType = layerType; 11699 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11700 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11701 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11702 11703 invalidateParentCaches(); 11704 invalidate(true); 11705 } 11706 11707 /** 11708 * Indicates whether this view has a static layer. A view with layer type 11709 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11710 * dynamic. 11711 */ 11712 boolean hasStaticLayer() { 11713 return true; 11714 } 11715 11716 /** 11717 * Indicates what type of layer is currently associated with this view. By default 11718 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11719 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11720 * for more information on the different types of layers. 11721 * 11722 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11723 * {@link #LAYER_TYPE_HARDWARE} 11724 * 11725 * @see #setLayerType(int, android.graphics.Paint) 11726 * @see #buildLayer() 11727 * @see #LAYER_TYPE_NONE 11728 * @see #LAYER_TYPE_SOFTWARE 11729 * @see #LAYER_TYPE_HARDWARE 11730 */ 11731 public int getLayerType() { 11732 return mLayerType; 11733 } 11734 11735 /** 11736 * Forces this view's layer to be created and this view to be rendered 11737 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11738 * invoking this method will have no effect. 11739 * 11740 * This method can for instance be used to render a view into its layer before 11741 * starting an animation. If this view is complex, rendering into the layer 11742 * before starting the animation will avoid skipping frames. 11743 * 11744 * @throws IllegalStateException If this view is not attached to a window 11745 * 11746 * @see #setLayerType(int, android.graphics.Paint) 11747 */ 11748 public void buildLayer() { 11749 if (mLayerType == LAYER_TYPE_NONE) return; 11750 11751 if (mAttachInfo == null) { 11752 throw new IllegalStateException("This view must be attached to a window first"); 11753 } 11754 11755 switch (mLayerType) { 11756 case LAYER_TYPE_HARDWARE: 11757 if (mAttachInfo.mHardwareRenderer != null && 11758 mAttachInfo.mHardwareRenderer.isEnabled() && 11759 mAttachInfo.mHardwareRenderer.validate()) { 11760 getHardwareLayer(); 11761 } 11762 break; 11763 case LAYER_TYPE_SOFTWARE: 11764 buildDrawingCache(true); 11765 break; 11766 } 11767 } 11768 11769 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11770 void flushLayer() { 11771 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11772 mHardwareLayer.flush(); 11773 } 11774 } 11775 11776 /** 11777 * <p>Returns a hardware layer that can be used to draw this view again 11778 * without executing its draw method.</p> 11779 * 11780 * @return A HardwareLayer ready to render, or null if an error occurred. 11781 */ 11782 HardwareLayer getHardwareLayer() { 11783 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11784 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11785 return null; 11786 } 11787 11788 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11789 11790 final int width = mRight - mLeft; 11791 final int height = mBottom - mTop; 11792 11793 if (width == 0 || height == 0) { 11794 return null; 11795 } 11796 11797 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11798 if (mHardwareLayer == null) { 11799 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11800 width, height, isOpaque()); 11801 mLocalDirtyRect.set(0, 0, width, height); 11802 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11803 mHardwareLayer.resize(width, height); 11804 mLocalDirtyRect.set(0, 0, width, height); 11805 } 11806 11807 // The layer is not valid if the underlying GPU resources cannot be allocated 11808 if (!mHardwareLayer.isValid()) { 11809 return null; 11810 } 11811 11812 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11813 mLocalDirtyRect.setEmpty(); 11814 } 11815 11816 return mHardwareLayer; 11817 } 11818 11819 /** 11820 * Destroys this View's hardware layer if possible. 11821 * 11822 * @return True if the layer was destroyed, false otherwise. 11823 * 11824 * @see #setLayerType(int, android.graphics.Paint) 11825 * @see #LAYER_TYPE_HARDWARE 11826 */ 11827 boolean destroyLayer(boolean valid) { 11828 if (mHardwareLayer != null) { 11829 AttachInfo info = mAttachInfo; 11830 if (info != null && info.mHardwareRenderer != null && 11831 info.mHardwareRenderer.isEnabled() && 11832 (valid || info.mHardwareRenderer.validate())) { 11833 mHardwareLayer.destroy(); 11834 mHardwareLayer = null; 11835 11836 invalidate(true); 11837 invalidateParentCaches(); 11838 } 11839 return true; 11840 } 11841 return false; 11842 } 11843 11844 /** 11845 * Destroys all hardware rendering resources. This method is invoked 11846 * when the system needs to reclaim resources. Upon execution of this 11847 * method, you should free any OpenGL resources created by the view. 11848 * 11849 * Note: you <strong>must</strong> call 11850 * <code>super.destroyHardwareResources()</code> when overriding 11851 * this method. 11852 * 11853 * @hide 11854 */ 11855 protected void destroyHardwareResources() { 11856 destroyLayer(true); 11857 } 11858 11859 /** 11860 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11861 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11862 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11863 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11864 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11865 * null.</p> 11866 * 11867 * <p>Enabling the drawing cache is similar to 11868 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11869 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11870 * drawing cache has no effect on rendering because the system uses a different mechanism 11871 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11872 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11873 * for information on how to enable software and hardware layers.</p> 11874 * 11875 * <p>This API can be used to manually generate 11876 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11877 * {@link #getDrawingCache()}.</p> 11878 * 11879 * @param enabled true to enable the drawing cache, false otherwise 11880 * 11881 * @see #isDrawingCacheEnabled() 11882 * @see #getDrawingCache() 11883 * @see #buildDrawingCache() 11884 * @see #setLayerType(int, android.graphics.Paint) 11885 */ 11886 public void setDrawingCacheEnabled(boolean enabled) { 11887 mCachingFailed = false; 11888 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11889 } 11890 11891 /** 11892 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11893 * 11894 * @return true if the drawing cache is enabled 11895 * 11896 * @see #setDrawingCacheEnabled(boolean) 11897 * @see #getDrawingCache() 11898 */ 11899 @ViewDebug.ExportedProperty(category = "drawing") 11900 public boolean isDrawingCacheEnabled() { 11901 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11902 } 11903 11904 /** 11905 * Debugging utility which recursively outputs the dirty state of a view and its 11906 * descendants. 11907 * 11908 * @hide 11909 */ 11910 @SuppressWarnings({"UnusedDeclaration"}) 11911 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 11912 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 11913 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 11914 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 11915 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 11916 if (clear) { 11917 mPrivateFlags &= clearMask; 11918 } 11919 if (this instanceof ViewGroup) { 11920 ViewGroup parent = (ViewGroup) this; 11921 final int count = parent.getChildCount(); 11922 for (int i = 0; i < count; i++) { 11923 final View child = parent.getChildAt(i); 11924 child.outputDirtyFlags(indent + " ", clear, clearMask); 11925 } 11926 } 11927 } 11928 11929 /** 11930 * This method is used by ViewGroup to cause its children to restore or recreate their 11931 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 11932 * to recreate its own display list, which would happen if it went through the normal 11933 * draw/dispatchDraw mechanisms. 11934 * 11935 * @hide 11936 */ 11937 protected void dispatchGetDisplayList() {} 11938 11939 /** 11940 * A view that is not attached or hardware accelerated cannot create a display list. 11941 * This method checks these conditions and returns the appropriate result. 11942 * 11943 * @return true if view has the ability to create a display list, false otherwise. 11944 * 11945 * @hide 11946 */ 11947 public boolean canHaveDisplayList() { 11948 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 11949 } 11950 11951 /** 11952 * @return The HardwareRenderer associated with that view or null if hardware rendering 11953 * is not supported or this this has not been attached to a window. 11954 * 11955 * @hide 11956 */ 11957 public HardwareRenderer getHardwareRenderer() { 11958 if (mAttachInfo != null) { 11959 return mAttachInfo.mHardwareRenderer; 11960 } 11961 return null; 11962 } 11963 11964 /** 11965 * Returns a DisplayList. If the incoming displayList is null, one will be created. 11966 * Otherwise, the same display list will be returned (after having been rendered into 11967 * along the way, depending on the invalidation state of the view). 11968 * 11969 * @param displayList The previous version of this displayList, could be null. 11970 * @param isLayer Whether the requester of the display list is a layer. If so, 11971 * the view will avoid creating a layer inside the resulting display list. 11972 * @return A new or reused DisplayList object. 11973 */ 11974 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 11975 if (!canHaveDisplayList()) { 11976 return null; 11977 } 11978 11979 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 11980 displayList == null || !displayList.isValid() || 11981 (!isLayer && mRecreateDisplayList))) { 11982 // Don't need to recreate the display list, just need to tell our 11983 // children to restore/recreate theirs 11984 if (displayList != null && displayList.isValid() && 11985 !isLayer && !mRecreateDisplayList) { 11986 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11987 mPrivateFlags &= ~DIRTY_MASK; 11988 dispatchGetDisplayList(); 11989 11990 return displayList; 11991 } 11992 11993 if (!isLayer) { 11994 // If we got here, we're recreating it. Mark it as such to ensure that 11995 // we copy in child display lists into ours in drawChild() 11996 mRecreateDisplayList = true; 11997 } 11998 if (displayList == null) { 11999 final String name = getClass().getSimpleName(); 12000 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12001 // If we're creating a new display list, make sure our parent gets invalidated 12002 // since they will need to recreate their display list to account for this 12003 // new child display list. 12004 invalidateParentCaches(); 12005 } 12006 12007 boolean caching = false; 12008 final HardwareCanvas canvas = displayList.start(); 12009 int width = mRight - mLeft; 12010 int height = mBottom - mTop; 12011 12012 try { 12013 canvas.setViewport(width, height); 12014 // The dirty rect should always be null for a display list 12015 canvas.onPreDraw(null); 12016 int layerType = ( 12017 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12018 getLayerType() : LAYER_TYPE_NONE; 12019 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12020 if (layerType == LAYER_TYPE_HARDWARE) { 12021 final HardwareLayer layer = getHardwareLayer(); 12022 if (layer != null && layer.isValid()) { 12023 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12024 } else { 12025 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12026 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12027 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12028 } 12029 caching = true; 12030 } else { 12031 buildDrawingCache(true); 12032 Bitmap cache = getDrawingCache(true); 12033 if (cache != null) { 12034 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12035 caching = true; 12036 } 12037 } 12038 } else { 12039 12040 computeScroll(); 12041 12042 canvas.translate(-mScrollX, -mScrollY); 12043 if (!isLayer) { 12044 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12045 mPrivateFlags &= ~DIRTY_MASK; 12046 } 12047 12048 // Fast path for layouts with no backgrounds 12049 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12050 dispatchDraw(canvas); 12051 } else { 12052 draw(canvas); 12053 } 12054 } 12055 } finally { 12056 canvas.onPostDraw(); 12057 12058 displayList.end(); 12059 displayList.setCaching(caching); 12060 if (isLayer) { 12061 displayList.setLeftTopRightBottom(0, 0, width, height); 12062 } else { 12063 setDisplayListProperties(displayList); 12064 } 12065 } 12066 } else if (!isLayer) { 12067 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12068 mPrivateFlags &= ~DIRTY_MASK; 12069 } 12070 12071 return displayList; 12072 } 12073 12074 /** 12075 * Get the DisplayList for the HardwareLayer 12076 * 12077 * @param layer The HardwareLayer whose DisplayList we want 12078 * @return A DisplayList fopr the specified HardwareLayer 12079 */ 12080 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12081 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12082 layer.setDisplayList(displayList); 12083 return displayList; 12084 } 12085 12086 12087 /** 12088 * <p>Returns a display list that can be used to draw this view again 12089 * without executing its draw method.</p> 12090 * 12091 * @return A DisplayList ready to replay, or null if caching is not enabled. 12092 * 12093 * @hide 12094 */ 12095 public DisplayList getDisplayList() { 12096 mDisplayList = getDisplayList(mDisplayList, false); 12097 return mDisplayList; 12098 } 12099 12100 /** 12101 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12102 * 12103 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12104 * 12105 * @see #getDrawingCache(boolean) 12106 */ 12107 public Bitmap getDrawingCache() { 12108 return getDrawingCache(false); 12109 } 12110 12111 /** 12112 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12113 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12114 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12115 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12116 * request the drawing cache by calling this method and draw it on screen if the 12117 * returned bitmap is not null.</p> 12118 * 12119 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12120 * this method will create a bitmap of the same size as this view. Because this bitmap 12121 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12122 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12123 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12124 * size than the view. This implies that your application must be able to handle this 12125 * size.</p> 12126 * 12127 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12128 * the current density of the screen when the application is in compatibility 12129 * mode. 12130 * 12131 * @return A bitmap representing this view or null if cache is disabled. 12132 * 12133 * @see #setDrawingCacheEnabled(boolean) 12134 * @see #isDrawingCacheEnabled() 12135 * @see #buildDrawingCache(boolean) 12136 * @see #destroyDrawingCache() 12137 */ 12138 public Bitmap getDrawingCache(boolean autoScale) { 12139 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12140 return null; 12141 } 12142 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12143 buildDrawingCache(autoScale); 12144 } 12145 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12146 } 12147 12148 /** 12149 * <p>Frees the resources used by the drawing cache. If you call 12150 * {@link #buildDrawingCache()} manually without calling 12151 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12152 * should cleanup the cache with this method afterwards.</p> 12153 * 12154 * @see #setDrawingCacheEnabled(boolean) 12155 * @see #buildDrawingCache() 12156 * @see #getDrawingCache() 12157 */ 12158 public void destroyDrawingCache() { 12159 if (mDrawingCache != null) { 12160 mDrawingCache.recycle(); 12161 mDrawingCache = null; 12162 } 12163 if (mUnscaledDrawingCache != null) { 12164 mUnscaledDrawingCache.recycle(); 12165 mUnscaledDrawingCache = null; 12166 } 12167 } 12168 12169 /** 12170 * Setting a solid background color for the drawing cache's bitmaps will improve 12171 * performance and memory usage. Note, though that this should only be used if this 12172 * view will always be drawn on top of a solid color. 12173 * 12174 * @param color The background color to use for the drawing cache's bitmap 12175 * 12176 * @see #setDrawingCacheEnabled(boolean) 12177 * @see #buildDrawingCache() 12178 * @see #getDrawingCache() 12179 */ 12180 public void setDrawingCacheBackgroundColor(int color) { 12181 if (color != mDrawingCacheBackgroundColor) { 12182 mDrawingCacheBackgroundColor = color; 12183 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12184 } 12185 } 12186 12187 /** 12188 * @see #setDrawingCacheBackgroundColor(int) 12189 * 12190 * @return The background color to used for the drawing cache's bitmap 12191 */ 12192 public int getDrawingCacheBackgroundColor() { 12193 return mDrawingCacheBackgroundColor; 12194 } 12195 12196 /** 12197 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12198 * 12199 * @see #buildDrawingCache(boolean) 12200 */ 12201 public void buildDrawingCache() { 12202 buildDrawingCache(false); 12203 } 12204 12205 /** 12206 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12207 * 12208 * <p>If you call {@link #buildDrawingCache()} manually without calling 12209 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12210 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12211 * 12212 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12213 * this method will create a bitmap of the same size as this view. Because this bitmap 12214 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12215 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12216 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12217 * size than the view. This implies that your application must be able to handle this 12218 * size.</p> 12219 * 12220 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12221 * you do not need the drawing cache bitmap, calling this method will increase memory 12222 * usage and cause the view to be rendered in software once, thus negatively impacting 12223 * performance.</p> 12224 * 12225 * @see #getDrawingCache() 12226 * @see #destroyDrawingCache() 12227 */ 12228 public void buildDrawingCache(boolean autoScale) { 12229 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12230 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12231 mCachingFailed = false; 12232 12233 if (ViewDebug.TRACE_HIERARCHY) { 12234 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12235 } 12236 12237 int width = mRight - mLeft; 12238 int height = mBottom - mTop; 12239 12240 final AttachInfo attachInfo = mAttachInfo; 12241 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12242 12243 if (autoScale && scalingRequired) { 12244 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12245 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12246 } 12247 12248 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12249 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12250 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12251 12252 if (width <= 0 || height <= 0 || 12253 // Projected bitmap size in bytes 12254 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12255 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12256 destroyDrawingCache(); 12257 mCachingFailed = true; 12258 return; 12259 } 12260 12261 boolean clear = true; 12262 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12263 12264 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12265 Bitmap.Config quality; 12266 if (!opaque) { 12267 // Never pick ARGB_4444 because it looks awful 12268 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12269 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12270 case DRAWING_CACHE_QUALITY_AUTO: 12271 quality = Bitmap.Config.ARGB_8888; 12272 break; 12273 case DRAWING_CACHE_QUALITY_LOW: 12274 quality = Bitmap.Config.ARGB_8888; 12275 break; 12276 case DRAWING_CACHE_QUALITY_HIGH: 12277 quality = Bitmap.Config.ARGB_8888; 12278 break; 12279 default: 12280 quality = Bitmap.Config.ARGB_8888; 12281 break; 12282 } 12283 } else { 12284 // Optimization for translucent windows 12285 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12286 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12287 } 12288 12289 // Try to cleanup memory 12290 if (bitmap != null) bitmap.recycle(); 12291 12292 try { 12293 bitmap = Bitmap.createBitmap(width, height, quality); 12294 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12295 if (autoScale) { 12296 mDrawingCache = bitmap; 12297 } else { 12298 mUnscaledDrawingCache = bitmap; 12299 } 12300 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12301 } catch (OutOfMemoryError e) { 12302 // If there is not enough memory to create the bitmap cache, just 12303 // ignore the issue as bitmap caches are not required to draw the 12304 // view hierarchy 12305 if (autoScale) { 12306 mDrawingCache = null; 12307 } else { 12308 mUnscaledDrawingCache = null; 12309 } 12310 mCachingFailed = true; 12311 return; 12312 } 12313 12314 clear = drawingCacheBackgroundColor != 0; 12315 } 12316 12317 Canvas canvas; 12318 if (attachInfo != null) { 12319 canvas = attachInfo.mCanvas; 12320 if (canvas == null) { 12321 canvas = new Canvas(); 12322 } 12323 canvas.setBitmap(bitmap); 12324 // Temporarily clobber the cached Canvas in case one of our children 12325 // is also using a drawing cache. Without this, the children would 12326 // steal the canvas by attaching their own bitmap to it and bad, bad 12327 // thing would happen (invisible views, corrupted drawings, etc.) 12328 attachInfo.mCanvas = null; 12329 } else { 12330 // This case should hopefully never or seldom happen 12331 canvas = new Canvas(bitmap); 12332 } 12333 12334 if (clear) { 12335 bitmap.eraseColor(drawingCacheBackgroundColor); 12336 } 12337 12338 computeScroll(); 12339 final int restoreCount = canvas.save(); 12340 12341 if (autoScale && scalingRequired) { 12342 final float scale = attachInfo.mApplicationScale; 12343 canvas.scale(scale, scale); 12344 } 12345 12346 canvas.translate(-mScrollX, -mScrollY); 12347 12348 mPrivateFlags |= DRAWN; 12349 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12350 mLayerType != LAYER_TYPE_NONE) { 12351 mPrivateFlags |= DRAWING_CACHE_VALID; 12352 } 12353 12354 // Fast path for layouts with no backgrounds 12355 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12356 if (ViewDebug.TRACE_HIERARCHY) { 12357 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12358 } 12359 mPrivateFlags &= ~DIRTY_MASK; 12360 dispatchDraw(canvas); 12361 } else { 12362 draw(canvas); 12363 } 12364 12365 canvas.restoreToCount(restoreCount); 12366 canvas.setBitmap(null); 12367 12368 if (attachInfo != null) { 12369 // Restore the cached Canvas for our siblings 12370 attachInfo.mCanvas = canvas; 12371 } 12372 } 12373 } 12374 12375 /** 12376 * Create a snapshot of the view into a bitmap. We should probably make 12377 * some form of this public, but should think about the API. 12378 */ 12379 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12380 int width = mRight - mLeft; 12381 int height = mBottom - mTop; 12382 12383 final AttachInfo attachInfo = mAttachInfo; 12384 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12385 width = (int) ((width * scale) + 0.5f); 12386 height = (int) ((height * scale) + 0.5f); 12387 12388 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12389 if (bitmap == null) { 12390 throw new OutOfMemoryError(); 12391 } 12392 12393 Resources resources = getResources(); 12394 if (resources != null) { 12395 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12396 } 12397 12398 Canvas canvas; 12399 if (attachInfo != null) { 12400 canvas = attachInfo.mCanvas; 12401 if (canvas == null) { 12402 canvas = new Canvas(); 12403 } 12404 canvas.setBitmap(bitmap); 12405 // Temporarily clobber the cached Canvas in case one of our children 12406 // is also using a drawing cache. Without this, the children would 12407 // steal the canvas by attaching their own bitmap to it and bad, bad 12408 // things would happen (invisible views, corrupted drawings, etc.) 12409 attachInfo.mCanvas = null; 12410 } else { 12411 // This case should hopefully never or seldom happen 12412 canvas = new Canvas(bitmap); 12413 } 12414 12415 if ((backgroundColor & 0xff000000) != 0) { 12416 bitmap.eraseColor(backgroundColor); 12417 } 12418 12419 computeScroll(); 12420 final int restoreCount = canvas.save(); 12421 canvas.scale(scale, scale); 12422 canvas.translate(-mScrollX, -mScrollY); 12423 12424 // Temporarily remove the dirty mask 12425 int flags = mPrivateFlags; 12426 mPrivateFlags &= ~DIRTY_MASK; 12427 12428 // Fast path for layouts with no backgrounds 12429 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12430 dispatchDraw(canvas); 12431 } else { 12432 draw(canvas); 12433 } 12434 12435 mPrivateFlags = flags; 12436 12437 canvas.restoreToCount(restoreCount); 12438 canvas.setBitmap(null); 12439 12440 if (attachInfo != null) { 12441 // Restore the cached Canvas for our siblings 12442 attachInfo.mCanvas = canvas; 12443 } 12444 12445 return bitmap; 12446 } 12447 12448 /** 12449 * Indicates whether this View is currently in edit mode. A View is usually 12450 * in edit mode when displayed within a developer tool. For instance, if 12451 * this View is being drawn by a visual user interface builder, this method 12452 * should return true. 12453 * 12454 * Subclasses should check the return value of this method to provide 12455 * different behaviors if their normal behavior might interfere with the 12456 * host environment. For instance: the class spawns a thread in its 12457 * constructor, the drawing code relies on device-specific features, etc. 12458 * 12459 * This method is usually checked in the drawing code of custom widgets. 12460 * 12461 * @return True if this View is in edit mode, false otherwise. 12462 */ 12463 public boolean isInEditMode() { 12464 return false; 12465 } 12466 12467 /** 12468 * If the View draws content inside its padding and enables fading edges, 12469 * it needs to support padding offsets. Padding offsets are added to the 12470 * fading edges to extend the length of the fade so that it covers pixels 12471 * drawn inside the padding. 12472 * 12473 * Subclasses of this class should override this method if they need 12474 * to draw content inside the padding. 12475 * 12476 * @return True if padding offset must be applied, false otherwise. 12477 * 12478 * @see #getLeftPaddingOffset() 12479 * @see #getRightPaddingOffset() 12480 * @see #getTopPaddingOffset() 12481 * @see #getBottomPaddingOffset() 12482 * 12483 * @since CURRENT 12484 */ 12485 protected boolean isPaddingOffsetRequired() { 12486 return false; 12487 } 12488 12489 /** 12490 * Amount by which to extend the left fading region. Called only when 12491 * {@link #isPaddingOffsetRequired()} returns true. 12492 * 12493 * @return The left padding offset in pixels. 12494 * 12495 * @see #isPaddingOffsetRequired() 12496 * 12497 * @since CURRENT 12498 */ 12499 protected int getLeftPaddingOffset() { 12500 return 0; 12501 } 12502 12503 /** 12504 * Amount by which to extend the right fading region. Called only when 12505 * {@link #isPaddingOffsetRequired()} returns true. 12506 * 12507 * @return The right padding offset in pixels. 12508 * 12509 * @see #isPaddingOffsetRequired() 12510 * 12511 * @since CURRENT 12512 */ 12513 protected int getRightPaddingOffset() { 12514 return 0; 12515 } 12516 12517 /** 12518 * Amount by which to extend the top fading region. Called only when 12519 * {@link #isPaddingOffsetRequired()} returns true. 12520 * 12521 * @return The top padding offset in pixels. 12522 * 12523 * @see #isPaddingOffsetRequired() 12524 * 12525 * @since CURRENT 12526 */ 12527 protected int getTopPaddingOffset() { 12528 return 0; 12529 } 12530 12531 /** 12532 * Amount by which to extend the bottom fading region. Called only when 12533 * {@link #isPaddingOffsetRequired()} returns true. 12534 * 12535 * @return The bottom padding offset in pixels. 12536 * 12537 * @see #isPaddingOffsetRequired() 12538 * 12539 * @since CURRENT 12540 */ 12541 protected int getBottomPaddingOffset() { 12542 return 0; 12543 } 12544 12545 /** 12546 * @hide 12547 * @param offsetRequired 12548 */ 12549 protected int getFadeTop(boolean offsetRequired) { 12550 int top = mPaddingTop; 12551 if (offsetRequired) top += getTopPaddingOffset(); 12552 return top; 12553 } 12554 12555 /** 12556 * @hide 12557 * @param offsetRequired 12558 */ 12559 protected int getFadeHeight(boolean offsetRequired) { 12560 int padding = mPaddingTop; 12561 if (offsetRequired) padding += getTopPaddingOffset(); 12562 return mBottom - mTop - mPaddingBottom - padding; 12563 } 12564 12565 /** 12566 * <p>Indicates whether this view is attached to a hardware accelerated 12567 * window or not.</p> 12568 * 12569 * <p>Even if this method returns true, it does not mean that every call 12570 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12571 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12572 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12573 * window is hardware accelerated, 12574 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12575 * return false, and this method will return true.</p> 12576 * 12577 * @return True if the view is attached to a window and the window is 12578 * hardware accelerated; false in any other case. 12579 */ 12580 public boolean isHardwareAccelerated() { 12581 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12582 } 12583 12584 /** 12585 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12586 * case of an active Animation being run on the view. 12587 */ 12588 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12589 Animation a, boolean scalingRequired) { 12590 Transformation invalidationTransform; 12591 final int flags = parent.mGroupFlags; 12592 final boolean initialized = a.isInitialized(); 12593 if (!initialized) { 12594 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12595 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12596 onAnimationStart(); 12597 } 12598 12599 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12600 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12601 if (parent.mInvalidationTransformation == null) { 12602 parent.mInvalidationTransformation = new Transformation(); 12603 } 12604 invalidationTransform = parent.mInvalidationTransformation; 12605 a.getTransformation(drawingTime, invalidationTransform, 1f); 12606 } else { 12607 invalidationTransform = parent.mChildTransformation; 12608 } 12609 if (more) { 12610 if (!a.willChangeBounds()) { 12611 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12612 parent.FLAG_OPTIMIZE_INVALIDATE) { 12613 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12614 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12615 // The child need to draw an animation, potentially offscreen, so 12616 // make sure we do not cancel invalidate requests 12617 parent.mPrivateFlags |= DRAW_ANIMATION; 12618 parent.invalidate(mLeft, mTop, mRight, mBottom); 12619 } 12620 } else { 12621 if (parent.mInvalidateRegion == null) { 12622 parent.mInvalidateRegion = new RectF(); 12623 } 12624 final RectF region = parent.mInvalidateRegion; 12625 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12626 invalidationTransform); 12627 12628 // The child need to draw an animation, potentially offscreen, so 12629 // make sure we do not cancel invalidate requests 12630 parent.mPrivateFlags |= DRAW_ANIMATION; 12631 12632 final int left = mLeft + (int) region.left; 12633 final int top = mTop + (int) region.top; 12634 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12635 top + (int) (region.height() + .5f)); 12636 } 12637 } 12638 return more; 12639 } 12640 12641 /** 12642 * This method is called by getDisplayList() when a display list is created or re-rendered. 12643 * It sets or resets the current value of all properties on that display list (resetting is 12644 * necessary when a display list is being re-created, because we need to make sure that 12645 * previously-set transform values 12646 */ 12647 void setDisplayListProperties(DisplayList displayList) { 12648 if (displayList != null) { 12649 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12650 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12651 if (mParent instanceof ViewGroup) { 12652 displayList.setClipChildren( 12653 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12654 } 12655 float alpha = 1; 12656 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12657 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12658 ViewGroup parentVG = (ViewGroup) mParent; 12659 final boolean hasTransform = 12660 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12661 if (hasTransform) { 12662 Transformation transform = parentVG.mChildTransformation; 12663 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12664 if (transformType != Transformation.TYPE_IDENTITY) { 12665 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12666 alpha = transform.getAlpha(); 12667 } 12668 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12669 displayList.setStaticMatrix(transform.getMatrix()); 12670 } 12671 } 12672 } 12673 } 12674 if (mTransformationInfo != null) { 12675 alpha *= mTransformationInfo.mAlpha; 12676 if (alpha < 1) { 12677 final int multipliedAlpha = (int) (255 * alpha); 12678 if (onSetAlpha(multipliedAlpha)) { 12679 alpha = 1; 12680 } 12681 } 12682 displayList.setTransformationInfo(alpha, 12683 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12684 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12685 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12686 mTransformationInfo.mScaleY); 12687 if (mTransformationInfo.mCamera == null) { 12688 mTransformationInfo.mCamera = new Camera(); 12689 mTransformationInfo.matrix3D = new Matrix(); 12690 } 12691 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12692 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12693 displayList.setPivotX(getPivotX()); 12694 displayList.setPivotY(getPivotY()); 12695 } 12696 } else if (alpha < 1) { 12697 displayList.setAlpha(alpha); 12698 } 12699 } 12700 } 12701 12702 /** 12703 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12704 * This draw() method is an implementation detail and is not intended to be overridden or 12705 * to be called from anywhere else other than ViewGroup.drawChild(). 12706 */ 12707 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12708 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12709 boolean more = false; 12710 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12711 final int flags = parent.mGroupFlags; 12712 12713 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12714 parent.mChildTransformation.clear(); 12715 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12716 } 12717 12718 Transformation transformToApply = null; 12719 boolean concatMatrix = false; 12720 12721 boolean scalingRequired = false; 12722 boolean caching; 12723 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12724 12725 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12726 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12727 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12728 caching = true; 12729 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12730 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12731 } else { 12732 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12733 } 12734 12735 final Animation a = getAnimation(); 12736 if (a != null) { 12737 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12738 concatMatrix = a.willChangeTransformationMatrix(); 12739 transformToApply = parent.mChildTransformation; 12740 } else if (!useDisplayListProperties && 12741 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12742 final boolean hasTransform = 12743 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12744 if (hasTransform) { 12745 final int transformType = parent.mChildTransformation.getTransformationType(); 12746 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12747 parent.mChildTransformation : null; 12748 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12749 } 12750 } 12751 12752 concatMatrix |= !childHasIdentityMatrix; 12753 12754 // Sets the flag as early as possible to allow draw() implementations 12755 // to call invalidate() successfully when doing animations 12756 mPrivateFlags |= DRAWN; 12757 12758 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12759 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12760 return more; 12761 } 12762 12763 if (hardwareAccelerated) { 12764 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12765 // retain the flag's value temporarily in the mRecreateDisplayList flag 12766 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12767 mPrivateFlags &= ~INVALIDATED; 12768 } 12769 12770 computeScroll(); 12771 12772 final int sx = mScrollX; 12773 final int sy = mScrollY; 12774 12775 DisplayList displayList = null; 12776 Bitmap cache = null; 12777 boolean hasDisplayList = false; 12778 if (caching) { 12779 if (!hardwareAccelerated) { 12780 if (layerType != LAYER_TYPE_NONE) { 12781 layerType = LAYER_TYPE_SOFTWARE; 12782 buildDrawingCache(true); 12783 } 12784 cache = getDrawingCache(true); 12785 } else { 12786 switch (layerType) { 12787 case LAYER_TYPE_SOFTWARE: 12788 if (useDisplayListProperties) { 12789 hasDisplayList = canHaveDisplayList(); 12790 } else { 12791 buildDrawingCache(true); 12792 cache = getDrawingCache(true); 12793 } 12794 break; 12795 case LAYER_TYPE_HARDWARE: 12796 if (useDisplayListProperties) { 12797 hasDisplayList = canHaveDisplayList(); 12798 } 12799 break; 12800 case LAYER_TYPE_NONE: 12801 // Delay getting the display list until animation-driven alpha values are 12802 // set up and possibly passed on to the view 12803 hasDisplayList = canHaveDisplayList(); 12804 break; 12805 } 12806 } 12807 } 12808 useDisplayListProperties &= hasDisplayList; 12809 if (useDisplayListProperties) { 12810 displayList = getDisplayList(); 12811 if (!displayList.isValid()) { 12812 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12813 // to getDisplayList(), the display list will be marked invalid and we should not 12814 // try to use it again. 12815 displayList = null; 12816 hasDisplayList = false; 12817 useDisplayListProperties = false; 12818 } 12819 } 12820 12821 final boolean hasNoCache = cache == null || hasDisplayList; 12822 final boolean offsetForScroll = cache == null && !hasDisplayList && 12823 layerType != LAYER_TYPE_HARDWARE; 12824 12825 int restoreTo = -1; 12826 if (!useDisplayListProperties || transformToApply != null) { 12827 restoreTo = canvas.save(); 12828 } 12829 if (offsetForScroll) { 12830 canvas.translate(mLeft - sx, mTop - sy); 12831 } else { 12832 if (!useDisplayListProperties) { 12833 canvas.translate(mLeft, mTop); 12834 } 12835 if (scalingRequired) { 12836 if (useDisplayListProperties) { 12837 // TODO: Might not need this if we put everything inside the DL 12838 restoreTo = canvas.save(); 12839 } 12840 // mAttachInfo cannot be null, otherwise scalingRequired == false 12841 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12842 canvas.scale(scale, scale); 12843 } 12844 } 12845 12846 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12847 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12848 if (transformToApply != null || !childHasIdentityMatrix) { 12849 int transX = 0; 12850 int transY = 0; 12851 12852 if (offsetForScroll) { 12853 transX = -sx; 12854 transY = -sy; 12855 } 12856 12857 if (transformToApply != null) { 12858 if (concatMatrix) { 12859 if (useDisplayListProperties) { 12860 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12861 } else { 12862 // Undo the scroll translation, apply the transformation matrix, 12863 // then redo the scroll translate to get the correct result. 12864 canvas.translate(-transX, -transY); 12865 canvas.concat(transformToApply.getMatrix()); 12866 canvas.translate(transX, transY); 12867 } 12868 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12869 } 12870 12871 float transformAlpha = transformToApply.getAlpha(); 12872 if (transformAlpha < 1) { 12873 alpha *= transformToApply.getAlpha(); 12874 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12875 } 12876 } 12877 12878 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12879 canvas.translate(-transX, -transY); 12880 canvas.concat(getMatrix()); 12881 canvas.translate(transX, transY); 12882 } 12883 } 12884 12885 if (alpha < 1) { 12886 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12887 if (hasNoCache) { 12888 final int multipliedAlpha = (int) (255 * alpha); 12889 if (!onSetAlpha(multipliedAlpha)) { 12890 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12891 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12892 layerType != LAYER_TYPE_NONE) { 12893 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12894 } 12895 if (useDisplayListProperties) { 12896 displayList.setAlpha(alpha * getAlpha()); 12897 } else if (layerType == LAYER_TYPE_NONE) { 12898 final int scrollX = hasDisplayList ? 0 : sx; 12899 final int scrollY = hasDisplayList ? 0 : sy; 12900 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 12901 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 12902 } 12903 } else { 12904 // Alpha is handled by the child directly, clobber the layer's alpha 12905 mPrivateFlags |= ALPHA_SET; 12906 } 12907 } 12908 } 12909 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12910 onSetAlpha(255); 12911 mPrivateFlags &= ~ALPHA_SET; 12912 } 12913 12914 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 12915 !useDisplayListProperties) { 12916 if (offsetForScroll) { 12917 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 12918 } else { 12919 if (!scalingRequired || cache == null) { 12920 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 12921 } else { 12922 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 12923 } 12924 } 12925 } 12926 12927 if (!useDisplayListProperties && hasDisplayList) { 12928 displayList = getDisplayList(); 12929 if (!displayList.isValid()) { 12930 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12931 // to getDisplayList(), the display list will be marked invalid and we should not 12932 // try to use it again. 12933 displayList = null; 12934 hasDisplayList = false; 12935 } 12936 } 12937 12938 if (hasNoCache) { 12939 boolean layerRendered = false; 12940 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 12941 final HardwareLayer layer = getHardwareLayer(); 12942 if (layer != null && layer.isValid()) { 12943 mLayerPaint.setAlpha((int) (alpha * 255)); 12944 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 12945 layerRendered = true; 12946 } else { 12947 final int scrollX = hasDisplayList ? 0 : sx; 12948 final int scrollY = hasDisplayList ? 0 : sy; 12949 canvas.saveLayer(scrollX, scrollY, 12950 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 12951 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12952 } 12953 } 12954 12955 if (!layerRendered) { 12956 if (!hasDisplayList) { 12957 // Fast path for layouts with no backgrounds 12958 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12959 if (ViewDebug.TRACE_HIERARCHY) { 12960 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 12961 } 12962 mPrivateFlags &= ~DIRTY_MASK; 12963 dispatchDraw(canvas); 12964 } else { 12965 draw(canvas); 12966 } 12967 } else { 12968 mPrivateFlags &= ~DIRTY_MASK; 12969 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 12970 } 12971 } 12972 } else if (cache != null) { 12973 mPrivateFlags &= ~DIRTY_MASK; 12974 Paint cachePaint; 12975 12976 if (layerType == LAYER_TYPE_NONE) { 12977 cachePaint = parent.mCachePaint; 12978 if (cachePaint == null) { 12979 cachePaint = new Paint(); 12980 cachePaint.setDither(false); 12981 parent.mCachePaint = cachePaint; 12982 } 12983 if (alpha < 1) { 12984 cachePaint.setAlpha((int) (alpha * 255)); 12985 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12986 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 12987 cachePaint.setAlpha(255); 12988 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12989 } 12990 } else { 12991 cachePaint = mLayerPaint; 12992 cachePaint.setAlpha((int) (alpha * 255)); 12993 } 12994 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 12995 } 12996 12997 if (restoreTo >= 0) { 12998 canvas.restoreToCount(restoreTo); 12999 } 13000 13001 if (a != null && !more) { 13002 if (!hardwareAccelerated && !a.getFillAfter()) { 13003 onSetAlpha(255); 13004 } 13005 parent.finishAnimatingView(this, a); 13006 } 13007 13008 if (more && hardwareAccelerated) { 13009 // invalidation is the trigger to recreate display lists, so if we're using 13010 // display lists to render, force an invalidate to allow the animation to 13011 // continue drawing another frame 13012 parent.invalidate(true); 13013 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13014 // alpha animations should cause the child to recreate its display list 13015 invalidate(true); 13016 } 13017 } 13018 13019 mRecreateDisplayList = false; 13020 13021 return more; 13022 } 13023 13024 /** 13025 * Manually render this view (and all of its children) to the given Canvas. 13026 * The view must have already done a full layout before this function is 13027 * called. When implementing a view, implement 13028 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13029 * If you do need to override this method, call the superclass version. 13030 * 13031 * @param canvas The Canvas to which the View is rendered. 13032 */ 13033 public void draw(Canvas canvas) { 13034 if (ViewDebug.TRACE_HIERARCHY) { 13035 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13036 } 13037 13038 final int privateFlags = mPrivateFlags; 13039 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13040 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13041 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13042 13043 /* 13044 * Draw traversal performs several drawing steps which must be executed 13045 * in the appropriate order: 13046 * 13047 * 1. Draw the background 13048 * 2. If necessary, save the canvas' layers to prepare for fading 13049 * 3. Draw view's content 13050 * 4. Draw children 13051 * 5. If necessary, draw the fading edges and restore layers 13052 * 6. Draw decorations (scrollbars for instance) 13053 */ 13054 13055 // Step 1, draw the background, if needed 13056 int saveCount; 13057 13058 if (!dirtyOpaque) { 13059 final Drawable background = mBackground; 13060 if (background != null) { 13061 final int scrollX = mScrollX; 13062 final int scrollY = mScrollY; 13063 13064 if (mBackgroundSizeChanged) { 13065 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13066 mBackgroundSizeChanged = false; 13067 } 13068 13069 if ((scrollX | scrollY) == 0) { 13070 background.draw(canvas); 13071 } else { 13072 canvas.translate(scrollX, scrollY); 13073 background.draw(canvas); 13074 canvas.translate(-scrollX, -scrollY); 13075 } 13076 } 13077 } 13078 13079 // skip step 2 & 5 if possible (common case) 13080 final int viewFlags = mViewFlags; 13081 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13082 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13083 if (!verticalEdges && !horizontalEdges) { 13084 // Step 3, draw the content 13085 if (!dirtyOpaque) onDraw(canvas); 13086 13087 // Step 4, draw the children 13088 dispatchDraw(canvas); 13089 13090 // Step 6, draw decorations (scrollbars) 13091 onDrawScrollBars(canvas); 13092 13093 // we're done... 13094 return; 13095 } 13096 13097 /* 13098 * Here we do the full fledged routine... 13099 * (this is an uncommon case where speed matters less, 13100 * this is why we repeat some of the tests that have been 13101 * done above) 13102 */ 13103 13104 boolean drawTop = false; 13105 boolean drawBottom = false; 13106 boolean drawLeft = false; 13107 boolean drawRight = false; 13108 13109 float topFadeStrength = 0.0f; 13110 float bottomFadeStrength = 0.0f; 13111 float leftFadeStrength = 0.0f; 13112 float rightFadeStrength = 0.0f; 13113 13114 // Step 2, save the canvas' layers 13115 int paddingLeft = mPaddingLeft; 13116 13117 final boolean offsetRequired = isPaddingOffsetRequired(); 13118 if (offsetRequired) { 13119 paddingLeft += getLeftPaddingOffset(); 13120 } 13121 13122 int left = mScrollX + paddingLeft; 13123 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13124 int top = mScrollY + getFadeTop(offsetRequired); 13125 int bottom = top + getFadeHeight(offsetRequired); 13126 13127 if (offsetRequired) { 13128 right += getRightPaddingOffset(); 13129 bottom += getBottomPaddingOffset(); 13130 } 13131 13132 final ScrollabilityCache scrollabilityCache = mScrollCache; 13133 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13134 int length = (int) fadeHeight; 13135 13136 // clip the fade length if top and bottom fades overlap 13137 // overlapping fades produce odd-looking artifacts 13138 if (verticalEdges && (top + length > bottom - length)) { 13139 length = (bottom - top) / 2; 13140 } 13141 13142 // also clip horizontal fades if necessary 13143 if (horizontalEdges && (left + length > right - length)) { 13144 length = (right - left) / 2; 13145 } 13146 13147 if (verticalEdges) { 13148 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13149 drawTop = topFadeStrength * fadeHeight > 1.0f; 13150 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13151 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13152 } 13153 13154 if (horizontalEdges) { 13155 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13156 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13157 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13158 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13159 } 13160 13161 saveCount = canvas.getSaveCount(); 13162 13163 int solidColor = getSolidColor(); 13164 if (solidColor == 0) { 13165 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13166 13167 if (drawTop) { 13168 canvas.saveLayer(left, top, right, top + length, null, flags); 13169 } 13170 13171 if (drawBottom) { 13172 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13173 } 13174 13175 if (drawLeft) { 13176 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13177 } 13178 13179 if (drawRight) { 13180 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13181 } 13182 } else { 13183 scrollabilityCache.setFadeColor(solidColor); 13184 } 13185 13186 // Step 3, draw the content 13187 if (!dirtyOpaque) onDraw(canvas); 13188 13189 // Step 4, draw the children 13190 dispatchDraw(canvas); 13191 13192 // Step 5, draw the fade effect and restore layers 13193 final Paint p = scrollabilityCache.paint; 13194 final Matrix matrix = scrollabilityCache.matrix; 13195 final Shader fade = scrollabilityCache.shader; 13196 13197 if (drawTop) { 13198 matrix.setScale(1, fadeHeight * topFadeStrength); 13199 matrix.postTranslate(left, top); 13200 fade.setLocalMatrix(matrix); 13201 canvas.drawRect(left, top, right, top + length, p); 13202 } 13203 13204 if (drawBottom) { 13205 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13206 matrix.postRotate(180); 13207 matrix.postTranslate(left, bottom); 13208 fade.setLocalMatrix(matrix); 13209 canvas.drawRect(left, bottom - length, right, bottom, p); 13210 } 13211 13212 if (drawLeft) { 13213 matrix.setScale(1, fadeHeight * leftFadeStrength); 13214 matrix.postRotate(-90); 13215 matrix.postTranslate(left, top); 13216 fade.setLocalMatrix(matrix); 13217 canvas.drawRect(left, top, left + length, bottom, p); 13218 } 13219 13220 if (drawRight) { 13221 matrix.setScale(1, fadeHeight * rightFadeStrength); 13222 matrix.postRotate(90); 13223 matrix.postTranslate(right, top); 13224 fade.setLocalMatrix(matrix); 13225 canvas.drawRect(right - length, top, right, bottom, p); 13226 } 13227 13228 canvas.restoreToCount(saveCount); 13229 13230 // Step 6, draw decorations (scrollbars) 13231 onDrawScrollBars(canvas); 13232 } 13233 13234 /** 13235 * Override this if your view is known to always be drawn on top of a solid color background, 13236 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13237 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13238 * should be set to 0xFF. 13239 * 13240 * @see #setVerticalFadingEdgeEnabled(boolean) 13241 * @see #setHorizontalFadingEdgeEnabled(boolean) 13242 * 13243 * @return The known solid color background for this view, or 0 if the color may vary 13244 */ 13245 @ViewDebug.ExportedProperty(category = "drawing") 13246 public int getSolidColor() { 13247 return 0; 13248 } 13249 13250 /** 13251 * Build a human readable string representation of the specified view flags. 13252 * 13253 * @param flags the view flags to convert to a string 13254 * @return a String representing the supplied flags 13255 */ 13256 private static String printFlags(int flags) { 13257 String output = ""; 13258 int numFlags = 0; 13259 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13260 output += "TAKES_FOCUS"; 13261 numFlags++; 13262 } 13263 13264 switch (flags & VISIBILITY_MASK) { 13265 case INVISIBLE: 13266 if (numFlags > 0) { 13267 output += " "; 13268 } 13269 output += "INVISIBLE"; 13270 // USELESS HERE numFlags++; 13271 break; 13272 case GONE: 13273 if (numFlags > 0) { 13274 output += " "; 13275 } 13276 output += "GONE"; 13277 // USELESS HERE numFlags++; 13278 break; 13279 default: 13280 break; 13281 } 13282 return output; 13283 } 13284 13285 /** 13286 * Build a human readable string representation of the specified private 13287 * view flags. 13288 * 13289 * @param privateFlags the private view flags to convert to a string 13290 * @return a String representing the supplied flags 13291 */ 13292 private static String printPrivateFlags(int privateFlags) { 13293 String output = ""; 13294 int numFlags = 0; 13295 13296 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13297 output += "WANTS_FOCUS"; 13298 numFlags++; 13299 } 13300 13301 if ((privateFlags & FOCUSED) == FOCUSED) { 13302 if (numFlags > 0) { 13303 output += " "; 13304 } 13305 output += "FOCUSED"; 13306 numFlags++; 13307 } 13308 13309 if ((privateFlags & SELECTED) == SELECTED) { 13310 if (numFlags > 0) { 13311 output += " "; 13312 } 13313 output += "SELECTED"; 13314 numFlags++; 13315 } 13316 13317 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13318 if (numFlags > 0) { 13319 output += " "; 13320 } 13321 output += "IS_ROOT_NAMESPACE"; 13322 numFlags++; 13323 } 13324 13325 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13326 if (numFlags > 0) { 13327 output += " "; 13328 } 13329 output += "HAS_BOUNDS"; 13330 numFlags++; 13331 } 13332 13333 if ((privateFlags & DRAWN) == DRAWN) { 13334 if (numFlags > 0) { 13335 output += " "; 13336 } 13337 output += "DRAWN"; 13338 // USELESS HERE numFlags++; 13339 } 13340 return output; 13341 } 13342 13343 /** 13344 * <p>Indicates whether or not this view's layout will be requested during 13345 * the next hierarchy layout pass.</p> 13346 * 13347 * @return true if the layout will be forced during next layout pass 13348 */ 13349 public boolean isLayoutRequested() { 13350 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13351 } 13352 13353 /** 13354 * Assign a size and position to a view and all of its 13355 * descendants 13356 * 13357 * <p>This is the second phase of the layout mechanism. 13358 * (The first is measuring). In this phase, each parent calls 13359 * layout on all of its children to position them. 13360 * This is typically done using the child measurements 13361 * that were stored in the measure pass().</p> 13362 * 13363 * <p>Derived classes should not override this method. 13364 * Derived classes with children should override 13365 * onLayout. In that method, they should 13366 * call layout on each of their children.</p> 13367 * 13368 * @param l Left position, relative to parent 13369 * @param t Top position, relative to parent 13370 * @param r Right position, relative to parent 13371 * @param b Bottom position, relative to parent 13372 */ 13373 @SuppressWarnings({"unchecked"}) 13374 public void layout(int l, int t, int r, int b) { 13375 int oldL = mLeft; 13376 int oldT = mTop; 13377 int oldB = mBottom; 13378 int oldR = mRight; 13379 boolean changed = setFrame(l, t, r, b); 13380 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13381 if (ViewDebug.TRACE_HIERARCHY) { 13382 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13383 } 13384 13385 onLayout(changed, l, t, r, b); 13386 mPrivateFlags &= ~LAYOUT_REQUIRED; 13387 13388 ListenerInfo li = mListenerInfo; 13389 if (li != null && li.mOnLayoutChangeListeners != null) { 13390 ArrayList<OnLayoutChangeListener> listenersCopy = 13391 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13392 int numListeners = listenersCopy.size(); 13393 for (int i = 0; i < numListeners; ++i) { 13394 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13395 } 13396 } 13397 } 13398 mPrivateFlags &= ~FORCE_LAYOUT; 13399 } 13400 13401 /** 13402 * Called from layout when this view should 13403 * assign a size and position to each of its children. 13404 * 13405 * Derived classes with children should override 13406 * this method and call layout on each of 13407 * their children. 13408 * @param changed This is a new size or position for this view 13409 * @param left Left position, relative to parent 13410 * @param top Top position, relative to parent 13411 * @param right Right position, relative to parent 13412 * @param bottom Bottom position, relative to parent 13413 */ 13414 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13415 } 13416 13417 /** 13418 * Assign a size and position to this view. 13419 * 13420 * This is called from layout. 13421 * 13422 * @param left Left position, relative to parent 13423 * @param top Top position, relative to parent 13424 * @param right Right position, relative to parent 13425 * @param bottom Bottom position, relative to parent 13426 * @return true if the new size and position are different than the 13427 * previous ones 13428 * {@hide} 13429 */ 13430 protected boolean setFrame(int left, int top, int right, int bottom) { 13431 boolean changed = false; 13432 13433 if (DBG) { 13434 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13435 + right + "," + bottom + ")"); 13436 } 13437 13438 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13439 changed = true; 13440 13441 // Remember our drawn bit 13442 int drawn = mPrivateFlags & DRAWN; 13443 13444 int oldWidth = mRight - mLeft; 13445 int oldHeight = mBottom - mTop; 13446 int newWidth = right - left; 13447 int newHeight = bottom - top; 13448 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13449 13450 // Invalidate our old position 13451 invalidate(sizeChanged); 13452 13453 mLeft = left; 13454 mTop = top; 13455 mRight = right; 13456 mBottom = bottom; 13457 if (mDisplayList != null) { 13458 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13459 } 13460 13461 mPrivateFlags |= HAS_BOUNDS; 13462 13463 13464 if (sizeChanged) { 13465 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13466 // A change in dimension means an auto-centered pivot point changes, too 13467 if (mTransformationInfo != null) { 13468 mTransformationInfo.mMatrixDirty = true; 13469 } 13470 } 13471 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13472 } 13473 13474 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13475 // If we are visible, force the DRAWN bit to on so that 13476 // this invalidate will go through (at least to our parent). 13477 // This is because someone may have invalidated this view 13478 // before this call to setFrame came in, thereby clearing 13479 // the DRAWN bit. 13480 mPrivateFlags |= DRAWN; 13481 invalidate(sizeChanged); 13482 // parent display list may need to be recreated based on a change in the bounds 13483 // of any child 13484 invalidateParentCaches(); 13485 } 13486 13487 // Reset drawn bit to original value (invalidate turns it off) 13488 mPrivateFlags |= drawn; 13489 13490 mBackgroundSizeChanged = true; 13491 } 13492 return changed; 13493 } 13494 13495 /** 13496 * Finalize inflating a view from XML. This is called as the last phase 13497 * of inflation, after all child views have been added. 13498 * 13499 * <p>Even if the subclass overrides onFinishInflate, they should always be 13500 * sure to call the super method, so that we get called. 13501 */ 13502 protected void onFinishInflate() { 13503 } 13504 13505 /** 13506 * Returns the resources associated with this view. 13507 * 13508 * @return Resources object. 13509 */ 13510 public Resources getResources() { 13511 return mResources; 13512 } 13513 13514 /** 13515 * Invalidates the specified Drawable. 13516 * 13517 * @param drawable the drawable to invalidate 13518 */ 13519 public void invalidateDrawable(Drawable drawable) { 13520 if (verifyDrawable(drawable)) { 13521 final Rect dirty = drawable.getBounds(); 13522 final int scrollX = mScrollX; 13523 final int scrollY = mScrollY; 13524 13525 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13526 dirty.right + scrollX, dirty.bottom + scrollY); 13527 } 13528 } 13529 13530 /** 13531 * Schedules an action on a drawable to occur at a specified time. 13532 * 13533 * @param who the recipient of the action 13534 * @param what the action to run on the drawable 13535 * @param when the time at which the action must occur. Uses the 13536 * {@link SystemClock#uptimeMillis} timebase. 13537 */ 13538 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13539 if (verifyDrawable(who) && what != null) { 13540 final long delay = when - SystemClock.uptimeMillis(); 13541 if (mAttachInfo != null) { 13542 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13543 Choreographer.CALLBACK_ANIMATION, what, who, 13544 Choreographer.subtractFrameDelay(delay)); 13545 } else { 13546 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13547 } 13548 } 13549 } 13550 13551 /** 13552 * Cancels a scheduled action on a drawable. 13553 * 13554 * @param who the recipient of the action 13555 * @param what the action to cancel 13556 */ 13557 public void unscheduleDrawable(Drawable who, Runnable what) { 13558 if (verifyDrawable(who) && what != null) { 13559 if (mAttachInfo != null) { 13560 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13561 Choreographer.CALLBACK_ANIMATION, what, who); 13562 } else { 13563 ViewRootImpl.getRunQueue().removeCallbacks(what); 13564 } 13565 } 13566 } 13567 13568 /** 13569 * Unschedule any events associated with the given Drawable. This can be 13570 * used when selecting a new Drawable into a view, so that the previous 13571 * one is completely unscheduled. 13572 * 13573 * @param who The Drawable to unschedule. 13574 * 13575 * @see #drawableStateChanged 13576 */ 13577 public void unscheduleDrawable(Drawable who) { 13578 if (mAttachInfo != null && who != null) { 13579 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13580 Choreographer.CALLBACK_ANIMATION, null, who); 13581 } 13582 } 13583 13584 /** 13585 * Return the layout direction of a given Drawable. 13586 * 13587 * @param who the Drawable to query 13588 */ 13589 public int getResolvedLayoutDirection(Drawable who) { 13590 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13591 } 13592 13593 /** 13594 * If your view subclass is displaying its own Drawable objects, it should 13595 * override this function and return true for any Drawable it is 13596 * displaying. This allows animations for those drawables to be 13597 * scheduled. 13598 * 13599 * <p>Be sure to call through to the super class when overriding this 13600 * function. 13601 * 13602 * @param who The Drawable to verify. Return true if it is one you are 13603 * displaying, else return the result of calling through to the 13604 * super class. 13605 * 13606 * @return boolean If true than the Drawable is being displayed in the 13607 * view; else false and it is not allowed to animate. 13608 * 13609 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13610 * @see #drawableStateChanged() 13611 */ 13612 protected boolean verifyDrawable(Drawable who) { 13613 return who == mBackground; 13614 } 13615 13616 /** 13617 * This function is called whenever the state of the view changes in such 13618 * a way that it impacts the state of drawables being shown. 13619 * 13620 * <p>Be sure to call through to the superclass when overriding this 13621 * function. 13622 * 13623 * @see Drawable#setState(int[]) 13624 */ 13625 protected void drawableStateChanged() { 13626 Drawable d = mBackground; 13627 if (d != null && d.isStateful()) { 13628 d.setState(getDrawableState()); 13629 } 13630 } 13631 13632 /** 13633 * Call this to force a view to update its drawable state. This will cause 13634 * drawableStateChanged to be called on this view. Views that are interested 13635 * in the new state should call getDrawableState. 13636 * 13637 * @see #drawableStateChanged 13638 * @see #getDrawableState 13639 */ 13640 public void refreshDrawableState() { 13641 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13642 drawableStateChanged(); 13643 13644 ViewParent parent = mParent; 13645 if (parent != null) { 13646 parent.childDrawableStateChanged(this); 13647 } 13648 } 13649 13650 /** 13651 * Return an array of resource IDs of the drawable states representing the 13652 * current state of the view. 13653 * 13654 * @return The current drawable state 13655 * 13656 * @see Drawable#setState(int[]) 13657 * @see #drawableStateChanged() 13658 * @see #onCreateDrawableState(int) 13659 */ 13660 public final int[] getDrawableState() { 13661 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13662 return mDrawableState; 13663 } else { 13664 mDrawableState = onCreateDrawableState(0); 13665 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13666 return mDrawableState; 13667 } 13668 } 13669 13670 /** 13671 * Generate the new {@link android.graphics.drawable.Drawable} state for 13672 * this view. This is called by the view 13673 * system when the cached Drawable state is determined to be invalid. To 13674 * retrieve the current state, you should use {@link #getDrawableState}. 13675 * 13676 * @param extraSpace if non-zero, this is the number of extra entries you 13677 * would like in the returned array in which you can place your own 13678 * states. 13679 * 13680 * @return Returns an array holding the current {@link Drawable} state of 13681 * the view. 13682 * 13683 * @see #mergeDrawableStates(int[], int[]) 13684 */ 13685 protected int[] onCreateDrawableState(int extraSpace) { 13686 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13687 mParent instanceof View) { 13688 return ((View) mParent).onCreateDrawableState(extraSpace); 13689 } 13690 13691 int[] drawableState; 13692 13693 int privateFlags = mPrivateFlags; 13694 13695 int viewStateIndex = 0; 13696 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13697 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13698 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13699 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13700 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13701 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13702 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13703 HardwareRenderer.isAvailable()) { 13704 // This is set if HW acceleration is requested, even if the current 13705 // process doesn't allow it. This is just to allow app preview 13706 // windows to better match their app. 13707 viewStateIndex |= VIEW_STATE_ACCELERATED; 13708 } 13709 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13710 13711 final int privateFlags2 = mPrivateFlags2; 13712 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13713 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13714 13715 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13716 13717 //noinspection ConstantIfStatement 13718 if (false) { 13719 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13720 Log.i("View", toString() 13721 + " pressed=" + ((privateFlags & PRESSED) != 0) 13722 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13723 + " fo=" + hasFocus() 13724 + " sl=" + ((privateFlags & SELECTED) != 0) 13725 + " wf=" + hasWindowFocus() 13726 + ": " + Arrays.toString(drawableState)); 13727 } 13728 13729 if (extraSpace == 0) { 13730 return drawableState; 13731 } 13732 13733 final int[] fullState; 13734 if (drawableState != null) { 13735 fullState = new int[drawableState.length + extraSpace]; 13736 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13737 } else { 13738 fullState = new int[extraSpace]; 13739 } 13740 13741 return fullState; 13742 } 13743 13744 /** 13745 * Merge your own state values in <var>additionalState</var> into the base 13746 * state values <var>baseState</var> that were returned by 13747 * {@link #onCreateDrawableState(int)}. 13748 * 13749 * @param baseState The base state values returned by 13750 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13751 * own additional state values. 13752 * 13753 * @param additionalState The additional state values you would like 13754 * added to <var>baseState</var>; this array is not modified. 13755 * 13756 * @return As a convenience, the <var>baseState</var> array you originally 13757 * passed into the function is returned. 13758 * 13759 * @see #onCreateDrawableState(int) 13760 */ 13761 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13762 final int N = baseState.length; 13763 int i = N - 1; 13764 while (i >= 0 && baseState[i] == 0) { 13765 i--; 13766 } 13767 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13768 return baseState; 13769 } 13770 13771 /** 13772 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13773 * on all Drawable objects associated with this view. 13774 */ 13775 public void jumpDrawablesToCurrentState() { 13776 if (mBackground != null) { 13777 mBackground.jumpToCurrentState(); 13778 } 13779 } 13780 13781 /** 13782 * Sets the background color for this view. 13783 * @param color the color of the background 13784 */ 13785 @RemotableViewMethod 13786 public void setBackgroundColor(int color) { 13787 if (mBackground instanceof ColorDrawable) { 13788 ((ColorDrawable) mBackground).setColor(color); 13789 } else { 13790 setBackground(new ColorDrawable(color)); 13791 } 13792 } 13793 13794 /** 13795 * Set the background to a given resource. The resource should refer to 13796 * a Drawable object or 0 to remove the background. 13797 * @param resid The identifier of the resource. 13798 * 13799 * @attr ref android.R.styleable#View_background 13800 */ 13801 @RemotableViewMethod 13802 public void setBackgroundResource(int resid) { 13803 if (resid != 0 && resid == mBackgroundResource) { 13804 return; 13805 } 13806 13807 Drawable d= null; 13808 if (resid != 0) { 13809 d = mResources.getDrawable(resid); 13810 } 13811 setBackground(d); 13812 13813 mBackgroundResource = resid; 13814 } 13815 13816 /** 13817 * Set the background to a given Drawable, or remove the background. If the 13818 * background has padding, this View's padding is set to the background's 13819 * padding. However, when a background is removed, this View's padding isn't 13820 * touched. If setting the padding is desired, please use 13821 * {@link #setPadding(int, int, int, int)}. 13822 * 13823 * @param background The Drawable to use as the background, or null to remove the 13824 * background 13825 */ 13826 public void setBackground(Drawable background) { 13827 //noinspection deprecation 13828 setBackgroundDrawable(background); 13829 } 13830 13831 /** 13832 * @deprecated use {@link #setBackground(Drawable)} instead 13833 */ 13834 @Deprecated 13835 public void setBackgroundDrawable(Drawable background) { 13836 if (background == mBackground) { 13837 return; 13838 } 13839 13840 boolean requestLayout = false; 13841 13842 mBackgroundResource = 0; 13843 13844 /* 13845 * Regardless of whether we're setting a new background or not, we want 13846 * to clear the previous drawable. 13847 */ 13848 if (mBackground != null) { 13849 mBackground.setCallback(null); 13850 unscheduleDrawable(mBackground); 13851 } 13852 13853 if (background != null) { 13854 Rect padding = sThreadLocal.get(); 13855 if (padding == null) { 13856 padding = new Rect(); 13857 sThreadLocal.set(padding); 13858 } 13859 if (background.getPadding(padding)) { 13860 switch (background.getResolvedLayoutDirectionSelf()) { 13861 case LAYOUT_DIRECTION_RTL: 13862 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13863 break; 13864 case LAYOUT_DIRECTION_LTR: 13865 default: 13866 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13867 } 13868 } 13869 13870 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13871 // if it has a different minimum size, we should layout again 13872 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13873 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13874 requestLayout = true; 13875 } 13876 13877 background.setCallback(this); 13878 if (background.isStateful()) { 13879 background.setState(getDrawableState()); 13880 } 13881 background.setVisible(getVisibility() == VISIBLE, false); 13882 mBackground = background; 13883 13884 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13885 mPrivateFlags &= ~SKIP_DRAW; 13886 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13887 requestLayout = true; 13888 } 13889 } else { 13890 /* Remove the background */ 13891 mBackground = null; 13892 13893 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13894 /* 13895 * This view ONLY drew the background before and we're removing 13896 * the background, so now it won't draw anything 13897 * (hence we SKIP_DRAW) 13898 */ 13899 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 13900 mPrivateFlags |= SKIP_DRAW; 13901 } 13902 13903 /* 13904 * When the background is set, we try to apply its padding to this 13905 * View. When the background is removed, we don't touch this View's 13906 * padding. This is noted in the Javadocs. Hence, we don't need to 13907 * requestLayout(), the invalidate() below is sufficient. 13908 */ 13909 13910 // The old background's minimum size could have affected this 13911 // View's layout, so let's requestLayout 13912 requestLayout = true; 13913 } 13914 13915 computeOpaqueFlags(); 13916 13917 if (requestLayout) { 13918 requestLayout(); 13919 } 13920 13921 mBackgroundSizeChanged = true; 13922 invalidate(true); 13923 } 13924 13925 /** 13926 * Gets the background drawable 13927 * 13928 * @return The drawable used as the background for this view, if any. 13929 * 13930 * @see #setBackground(Drawable) 13931 * 13932 * @attr ref android.R.styleable#View_background 13933 */ 13934 public Drawable getBackground() { 13935 return mBackground; 13936 } 13937 13938 /** 13939 * Sets the padding. The view may add on the space required to display 13940 * the scrollbars, depending on the style and visibility of the scrollbars. 13941 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 13942 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 13943 * from the values set in this call. 13944 * 13945 * @attr ref android.R.styleable#View_padding 13946 * @attr ref android.R.styleable#View_paddingBottom 13947 * @attr ref android.R.styleable#View_paddingLeft 13948 * @attr ref android.R.styleable#View_paddingRight 13949 * @attr ref android.R.styleable#View_paddingTop 13950 * @param left the left padding in pixels 13951 * @param top the top padding in pixels 13952 * @param right the right padding in pixels 13953 * @param bottom the bottom padding in pixels 13954 */ 13955 public void setPadding(int left, int top, int right, int bottom) { 13956 mUserPaddingStart = -1; 13957 mUserPaddingEnd = -1; 13958 mUserPaddingRelative = false; 13959 13960 internalSetPadding(left, top, right, bottom); 13961 } 13962 13963 private void internalSetPadding(int left, int top, int right, int bottom) { 13964 mUserPaddingLeft = left; 13965 mUserPaddingRight = right; 13966 mUserPaddingBottom = bottom; 13967 13968 final int viewFlags = mViewFlags; 13969 boolean changed = false; 13970 13971 // Common case is there are no scroll bars. 13972 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 13973 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 13974 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 13975 ? 0 : getVerticalScrollbarWidth(); 13976 switch (mVerticalScrollbarPosition) { 13977 case SCROLLBAR_POSITION_DEFAULT: 13978 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 13979 left += offset; 13980 } else { 13981 right += offset; 13982 } 13983 break; 13984 case SCROLLBAR_POSITION_RIGHT: 13985 right += offset; 13986 break; 13987 case SCROLLBAR_POSITION_LEFT: 13988 left += offset; 13989 break; 13990 } 13991 } 13992 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 13993 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 13994 ? 0 : getHorizontalScrollbarHeight(); 13995 } 13996 } 13997 13998 if (mPaddingLeft != left) { 13999 changed = true; 14000 mPaddingLeft = left; 14001 } 14002 if (mPaddingTop != top) { 14003 changed = true; 14004 mPaddingTop = top; 14005 } 14006 if (mPaddingRight != right) { 14007 changed = true; 14008 mPaddingRight = right; 14009 } 14010 if (mPaddingBottom != bottom) { 14011 changed = true; 14012 mPaddingBottom = bottom; 14013 } 14014 14015 if (changed) { 14016 requestLayout(); 14017 } 14018 } 14019 14020 /** 14021 * Sets the relative padding. The view may add on the space required to display 14022 * the scrollbars, depending on the style and visibility of the scrollbars. 14023 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14024 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14025 * from the values set in this call. 14026 * 14027 * @attr ref android.R.styleable#View_padding 14028 * @attr ref android.R.styleable#View_paddingBottom 14029 * @attr ref android.R.styleable#View_paddingStart 14030 * @attr ref android.R.styleable#View_paddingEnd 14031 * @attr ref android.R.styleable#View_paddingTop 14032 * @param start the start padding in pixels 14033 * @param top the top padding in pixels 14034 * @param end the end padding in pixels 14035 * @param bottom the bottom padding in pixels 14036 */ 14037 public void setPaddingRelative(int start, int top, int end, int bottom) { 14038 mUserPaddingStart = start; 14039 mUserPaddingEnd = end; 14040 mUserPaddingRelative = true; 14041 14042 switch(getResolvedLayoutDirection()) { 14043 case LAYOUT_DIRECTION_RTL: 14044 internalSetPadding(end, top, start, bottom); 14045 break; 14046 case LAYOUT_DIRECTION_LTR: 14047 default: 14048 internalSetPadding(start, top, end, bottom); 14049 } 14050 } 14051 14052 /** 14053 * Returns the top padding of this view. 14054 * 14055 * @return the top padding in pixels 14056 */ 14057 public int getPaddingTop() { 14058 return mPaddingTop; 14059 } 14060 14061 /** 14062 * Returns the bottom padding of this view. If there are inset and enabled 14063 * scrollbars, this value may include the space required to display the 14064 * scrollbars as well. 14065 * 14066 * @return the bottom padding in pixels 14067 */ 14068 public int getPaddingBottom() { 14069 return mPaddingBottom; 14070 } 14071 14072 /** 14073 * Returns the left padding of this view. If there are inset and enabled 14074 * scrollbars, this value may include the space required to display the 14075 * scrollbars as well. 14076 * 14077 * @return the left padding in pixels 14078 */ 14079 public int getPaddingLeft() { 14080 return mPaddingLeft; 14081 } 14082 14083 /** 14084 * Returns the start padding of this view depending on its resolved layout direction. 14085 * If there are inset and enabled scrollbars, this value may include the space 14086 * required to display the scrollbars as well. 14087 * 14088 * @return the start padding in pixels 14089 */ 14090 public int getPaddingStart() { 14091 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14092 mPaddingRight : mPaddingLeft; 14093 } 14094 14095 /** 14096 * Returns the right padding of this view. If there are inset and enabled 14097 * scrollbars, this value may include the space required to display the 14098 * scrollbars as well. 14099 * 14100 * @return the right padding in pixels 14101 */ 14102 public int getPaddingRight() { 14103 return mPaddingRight; 14104 } 14105 14106 /** 14107 * Returns the end padding of this view depending on its resolved layout direction. 14108 * If there are inset and enabled scrollbars, this value may include the space 14109 * required to display the scrollbars as well. 14110 * 14111 * @return the end padding in pixels 14112 */ 14113 public int getPaddingEnd() { 14114 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14115 mPaddingLeft : mPaddingRight; 14116 } 14117 14118 /** 14119 * Return if the padding as been set thru relative values 14120 * {@link #setPaddingRelative(int, int, int, int)} or thru 14121 * @attr ref android.R.styleable#View_paddingStart or 14122 * @attr ref android.R.styleable#View_paddingEnd 14123 * 14124 * @return true if the padding is relative or false if it is not. 14125 */ 14126 public boolean isPaddingRelative() { 14127 return mUserPaddingRelative; 14128 } 14129 14130 /** 14131 * @hide 14132 */ 14133 public Insets getOpticalInsets() { 14134 if (mLayoutInsets == null) { 14135 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14136 } 14137 return mLayoutInsets; 14138 } 14139 14140 /** 14141 * @hide 14142 */ 14143 public void setLayoutInsets(Insets layoutInsets) { 14144 mLayoutInsets = layoutInsets; 14145 } 14146 14147 /** 14148 * Changes the selection state of this view. A view can be selected or not. 14149 * Note that selection is not the same as focus. Views are typically 14150 * selected in the context of an AdapterView like ListView or GridView; 14151 * the selected view is the view that is highlighted. 14152 * 14153 * @param selected true if the view must be selected, false otherwise 14154 */ 14155 public void setSelected(boolean selected) { 14156 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14157 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14158 if (!selected) resetPressedState(); 14159 invalidate(true); 14160 refreshDrawableState(); 14161 dispatchSetSelected(selected); 14162 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14163 notifyAccessibilityStateChanged(); 14164 } 14165 } 14166 } 14167 14168 /** 14169 * Dispatch setSelected to all of this View's children. 14170 * 14171 * @see #setSelected(boolean) 14172 * 14173 * @param selected The new selected state 14174 */ 14175 protected void dispatchSetSelected(boolean selected) { 14176 } 14177 14178 /** 14179 * Indicates the selection state of this view. 14180 * 14181 * @return true if the view is selected, false otherwise 14182 */ 14183 @ViewDebug.ExportedProperty 14184 public boolean isSelected() { 14185 return (mPrivateFlags & SELECTED) != 0; 14186 } 14187 14188 /** 14189 * Changes the activated state of this view. A view can be activated or not. 14190 * Note that activation is not the same as selection. Selection is 14191 * a transient property, representing the view (hierarchy) the user is 14192 * currently interacting with. Activation is a longer-term state that the 14193 * user can move views in and out of. For example, in a list view with 14194 * single or multiple selection enabled, the views in the current selection 14195 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14196 * here.) The activated state is propagated down to children of the view it 14197 * is set on. 14198 * 14199 * @param activated true if the view must be activated, false otherwise 14200 */ 14201 public void setActivated(boolean activated) { 14202 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14203 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14204 invalidate(true); 14205 refreshDrawableState(); 14206 dispatchSetActivated(activated); 14207 } 14208 } 14209 14210 /** 14211 * Dispatch setActivated to all of this View's children. 14212 * 14213 * @see #setActivated(boolean) 14214 * 14215 * @param activated The new activated state 14216 */ 14217 protected void dispatchSetActivated(boolean activated) { 14218 } 14219 14220 /** 14221 * Indicates the activation state of this view. 14222 * 14223 * @return true if the view is activated, false otherwise 14224 */ 14225 @ViewDebug.ExportedProperty 14226 public boolean isActivated() { 14227 return (mPrivateFlags & ACTIVATED) != 0; 14228 } 14229 14230 /** 14231 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14232 * observer can be used to get notifications when global events, like 14233 * layout, happen. 14234 * 14235 * The returned ViewTreeObserver observer is not guaranteed to remain 14236 * valid for the lifetime of this View. If the caller of this method keeps 14237 * a long-lived reference to ViewTreeObserver, it should always check for 14238 * the return value of {@link ViewTreeObserver#isAlive()}. 14239 * 14240 * @return The ViewTreeObserver for this view's hierarchy. 14241 */ 14242 public ViewTreeObserver getViewTreeObserver() { 14243 if (mAttachInfo != null) { 14244 return mAttachInfo.mTreeObserver; 14245 } 14246 if (mFloatingTreeObserver == null) { 14247 mFloatingTreeObserver = new ViewTreeObserver(); 14248 } 14249 return mFloatingTreeObserver; 14250 } 14251 14252 /** 14253 * <p>Finds the topmost view in the current view hierarchy.</p> 14254 * 14255 * @return the topmost view containing this view 14256 */ 14257 public View getRootView() { 14258 if (mAttachInfo != null) { 14259 final View v = mAttachInfo.mRootView; 14260 if (v != null) { 14261 return v; 14262 } 14263 } 14264 14265 View parent = this; 14266 14267 while (parent.mParent != null && parent.mParent instanceof View) { 14268 parent = (View) parent.mParent; 14269 } 14270 14271 return parent; 14272 } 14273 14274 /** 14275 * <p>Computes the coordinates of this view on the screen. The argument 14276 * must be an array of two integers. After the method returns, the array 14277 * contains the x and y location in that order.</p> 14278 * 14279 * @param location an array of two integers in which to hold the coordinates 14280 */ 14281 public void getLocationOnScreen(int[] location) { 14282 getLocationInWindow(location); 14283 14284 final AttachInfo info = mAttachInfo; 14285 if (info != null) { 14286 location[0] += info.mWindowLeft; 14287 location[1] += info.mWindowTop; 14288 } 14289 } 14290 14291 /** 14292 * <p>Computes the coordinates of this view in its window. The argument 14293 * must be an array of two integers. After the method returns, the array 14294 * contains the x and y location in that order.</p> 14295 * 14296 * @param location an array of two integers in which to hold the coordinates 14297 */ 14298 public void getLocationInWindow(int[] location) { 14299 if (location == null || location.length < 2) { 14300 throw new IllegalArgumentException("location must be an array of two integers"); 14301 } 14302 14303 if (mAttachInfo == null) { 14304 // When the view is not attached to a window, this method does not make sense 14305 location[0] = location[1] = 0; 14306 return; 14307 } 14308 14309 float[] position = mAttachInfo.mTmpTransformLocation; 14310 position[0] = position[1] = 0.0f; 14311 14312 if (!hasIdentityMatrix()) { 14313 getMatrix().mapPoints(position); 14314 } 14315 14316 position[0] += mLeft; 14317 position[1] += mTop; 14318 14319 ViewParent viewParent = mParent; 14320 while (viewParent instanceof View) { 14321 final View view = (View) viewParent; 14322 14323 position[0] -= view.mScrollX; 14324 position[1] -= view.mScrollY; 14325 14326 if (!view.hasIdentityMatrix()) { 14327 view.getMatrix().mapPoints(position); 14328 } 14329 14330 position[0] += view.mLeft; 14331 position[1] += view.mTop; 14332 14333 viewParent = view.mParent; 14334 } 14335 14336 if (viewParent instanceof ViewRootImpl) { 14337 // *cough* 14338 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14339 position[1] -= vr.mCurScrollY; 14340 } 14341 14342 location[0] = (int) (position[0] + 0.5f); 14343 location[1] = (int) (position[1] + 0.5f); 14344 } 14345 14346 /** 14347 * {@hide} 14348 * @param id the id of the view to be found 14349 * @return the view of the specified id, null if cannot be found 14350 */ 14351 protected View findViewTraversal(int id) { 14352 if (id == mID) { 14353 return this; 14354 } 14355 return null; 14356 } 14357 14358 /** 14359 * {@hide} 14360 * @param tag the tag of the view to be found 14361 * @return the view of specified tag, null if cannot be found 14362 */ 14363 protected View findViewWithTagTraversal(Object tag) { 14364 if (tag != null && tag.equals(mTag)) { 14365 return this; 14366 } 14367 return null; 14368 } 14369 14370 /** 14371 * {@hide} 14372 * @param predicate The predicate to evaluate. 14373 * @param childToSkip If not null, ignores this child during the recursive traversal. 14374 * @return The first view that matches the predicate or null. 14375 */ 14376 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14377 if (predicate.apply(this)) { 14378 return this; 14379 } 14380 return null; 14381 } 14382 14383 /** 14384 * Look for a child view with the given id. If this view has the given 14385 * id, return this view. 14386 * 14387 * @param id The id to search for. 14388 * @return The view that has the given id in the hierarchy or null 14389 */ 14390 public final View findViewById(int id) { 14391 if (id < 0) { 14392 return null; 14393 } 14394 return findViewTraversal(id); 14395 } 14396 14397 /** 14398 * Finds a view by its unuque and stable accessibility id. 14399 * 14400 * @param accessibilityId The searched accessibility id. 14401 * @return The found view. 14402 */ 14403 final View findViewByAccessibilityId(int accessibilityId) { 14404 if (accessibilityId < 0) { 14405 return null; 14406 } 14407 return findViewByAccessibilityIdTraversal(accessibilityId); 14408 } 14409 14410 /** 14411 * Performs the traversal to find a view by its unuque and stable accessibility id. 14412 * 14413 * <strong>Note:</strong>This method does not stop at the root namespace 14414 * boundary since the user can touch the screen at an arbitrary location 14415 * potentially crossing the root namespace bounday which will send an 14416 * accessibility event to accessibility services and they should be able 14417 * to obtain the event source. Also accessibility ids are guaranteed to be 14418 * unique in the window. 14419 * 14420 * @param accessibilityId The accessibility id. 14421 * @return The found view. 14422 */ 14423 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14424 if (getAccessibilityViewId() == accessibilityId) { 14425 return this; 14426 } 14427 return null; 14428 } 14429 14430 /** 14431 * Look for a child view with the given tag. If this view has the given 14432 * tag, return this view. 14433 * 14434 * @param tag The tag to search for, using "tag.equals(getTag())". 14435 * @return The View that has the given tag in the hierarchy or null 14436 */ 14437 public final View findViewWithTag(Object tag) { 14438 if (tag == null) { 14439 return null; 14440 } 14441 return findViewWithTagTraversal(tag); 14442 } 14443 14444 /** 14445 * {@hide} 14446 * Look for a child view that matches the specified predicate. 14447 * If this view matches the predicate, return this view. 14448 * 14449 * @param predicate The predicate to evaluate. 14450 * @return The first view that matches the predicate or null. 14451 */ 14452 public final View findViewByPredicate(Predicate<View> predicate) { 14453 return findViewByPredicateTraversal(predicate, null); 14454 } 14455 14456 /** 14457 * {@hide} 14458 * Look for a child view that matches the specified predicate, 14459 * starting with the specified view and its descendents and then 14460 * recusively searching the ancestors and siblings of that view 14461 * until this view is reached. 14462 * 14463 * This method is useful in cases where the predicate does not match 14464 * a single unique view (perhaps multiple views use the same id) 14465 * and we are trying to find the view that is "closest" in scope to the 14466 * starting view. 14467 * 14468 * @param start The view to start from. 14469 * @param predicate The predicate to evaluate. 14470 * @return The first view that matches the predicate or null. 14471 */ 14472 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14473 View childToSkip = null; 14474 for (;;) { 14475 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14476 if (view != null || start == this) { 14477 return view; 14478 } 14479 14480 ViewParent parent = start.getParent(); 14481 if (parent == null || !(parent instanceof View)) { 14482 return null; 14483 } 14484 14485 childToSkip = start; 14486 start = (View) parent; 14487 } 14488 } 14489 14490 /** 14491 * Sets the identifier for this view. The identifier does not have to be 14492 * unique in this view's hierarchy. The identifier should be a positive 14493 * number. 14494 * 14495 * @see #NO_ID 14496 * @see #getId() 14497 * @see #findViewById(int) 14498 * 14499 * @param id a number used to identify the view 14500 * 14501 * @attr ref android.R.styleable#View_id 14502 */ 14503 public void setId(int id) { 14504 mID = id; 14505 } 14506 14507 /** 14508 * {@hide} 14509 * 14510 * @param isRoot true if the view belongs to the root namespace, false 14511 * otherwise 14512 */ 14513 public void setIsRootNamespace(boolean isRoot) { 14514 if (isRoot) { 14515 mPrivateFlags |= IS_ROOT_NAMESPACE; 14516 } else { 14517 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14518 } 14519 } 14520 14521 /** 14522 * {@hide} 14523 * 14524 * @return true if the view belongs to the root namespace, false otherwise 14525 */ 14526 public boolean isRootNamespace() { 14527 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14528 } 14529 14530 /** 14531 * Returns this view's identifier. 14532 * 14533 * @return a positive integer used to identify the view or {@link #NO_ID} 14534 * if the view has no ID 14535 * 14536 * @see #setId(int) 14537 * @see #findViewById(int) 14538 * @attr ref android.R.styleable#View_id 14539 */ 14540 @ViewDebug.CapturedViewProperty 14541 public int getId() { 14542 return mID; 14543 } 14544 14545 /** 14546 * Returns this view's tag. 14547 * 14548 * @return the Object stored in this view as a tag 14549 * 14550 * @see #setTag(Object) 14551 * @see #getTag(int) 14552 */ 14553 @ViewDebug.ExportedProperty 14554 public Object getTag() { 14555 return mTag; 14556 } 14557 14558 /** 14559 * Sets the tag associated with this view. A tag can be used to mark 14560 * a view in its hierarchy and does not have to be unique within the 14561 * hierarchy. Tags can also be used to store data within a view without 14562 * resorting to another data structure. 14563 * 14564 * @param tag an Object to tag the view with 14565 * 14566 * @see #getTag() 14567 * @see #setTag(int, Object) 14568 */ 14569 public void setTag(final Object tag) { 14570 mTag = tag; 14571 } 14572 14573 /** 14574 * Returns the tag associated with this view and the specified key. 14575 * 14576 * @param key The key identifying the tag 14577 * 14578 * @return the Object stored in this view as a tag 14579 * 14580 * @see #setTag(int, Object) 14581 * @see #getTag() 14582 */ 14583 public Object getTag(int key) { 14584 if (mKeyedTags != null) return mKeyedTags.get(key); 14585 return null; 14586 } 14587 14588 /** 14589 * Sets a tag associated with this view and a key. A tag can be used 14590 * to mark a view in its hierarchy and does not have to be unique within 14591 * the hierarchy. Tags can also be used to store data within a view 14592 * without resorting to another data structure. 14593 * 14594 * The specified key should be an id declared in the resources of the 14595 * application to ensure it is unique (see the <a 14596 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14597 * Keys identified as belonging to 14598 * the Android framework or not associated with any package will cause 14599 * an {@link IllegalArgumentException} to be thrown. 14600 * 14601 * @param key The key identifying the tag 14602 * @param tag An Object to tag the view with 14603 * 14604 * @throws IllegalArgumentException If they specified key is not valid 14605 * 14606 * @see #setTag(Object) 14607 * @see #getTag(int) 14608 */ 14609 public void setTag(int key, final Object tag) { 14610 // If the package id is 0x00 or 0x01, it's either an undefined package 14611 // or a framework id 14612 if ((key >>> 24) < 2) { 14613 throw new IllegalArgumentException("The key must be an application-specific " 14614 + "resource id."); 14615 } 14616 14617 setKeyedTag(key, tag); 14618 } 14619 14620 /** 14621 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14622 * framework id. 14623 * 14624 * @hide 14625 */ 14626 public void setTagInternal(int key, Object tag) { 14627 if ((key >>> 24) != 0x1) { 14628 throw new IllegalArgumentException("The key must be a framework-specific " 14629 + "resource id."); 14630 } 14631 14632 setKeyedTag(key, tag); 14633 } 14634 14635 private void setKeyedTag(int key, Object tag) { 14636 if (mKeyedTags == null) { 14637 mKeyedTags = new SparseArray<Object>(); 14638 } 14639 14640 mKeyedTags.put(key, tag); 14641 } 14642 14643 /** 14644 * @param consistency The type of consistency. See ViewDebug for more information. 14645 * 14646 * @hide 14647 */ 14648 protected boolean dispatchConsistencyCheck(int consistency) { 14649 return onConsistencyCheck(consistency); 14650 } 14651 14652 /** 14653 * Method that subclasses should implement to check their consistency. The type of 14654 * consistency check is indicated by the bit field passed as a parameter. 14655 * 14656 * @param consistency The type of consistency. See ViewDebug for more information. 14657 * 14658 * @throws IllegalStateException if the view is in an inconsistent state. 14659 * 14660 * @hide 14661 */ 14662 protected boolean onConsistencyCheck(int consistency) { 14663 boolean result = true; 14664 14665 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14666 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14667 14668 if (checkLayout) { 14669 if (getParent() == null) { 14670 result = false; 14671 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14672 "View " + this + " does not have a parent."); 14673 } 14674 14675 if (mAttachInfo == null) { 14676 result = false; 14677 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14678 "View " + this + " is not attached to a window."); 14679 } 14680 } 14681 14682 if (checkDrawing) { 14683 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14684 // from their draw() method 14685 14686 if ((mPrivateFlags & DRAWN) != DRAWN && 14687 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14688 result = false; 14689 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14690 "View " + this + " was invalidated but its drawing cache is valid."); 14691 } 14692 } 14693 14694 return result; 14695 } 14696 14697 /** 14698 * Prints information about this view in the log output, with the tag 14699 * {@link #VIEW_LOG_TAG}. 14700 * 14701 * @hide 14702 */ 14703 public void debug() { 14704 debug(0); 14705 } 14706 14707 /** 14708 * Prints information about this view in the log output, with the tag 14709 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14710 * indentation defined by the <code>depth</code>. 14711 * 14712 * @param depth the indentation level 14713 * 14714 * @hide 14715 */ 14716 protected void debug(int depth) { 14717 String output = debugIndent(depth - 1); 14718 14719 output += "+ " + this; 14720 int id = getId(); 14721 if (id != -1) { 14722 output += " (id=" + id + ")"; 14723 } 14724 Object tag = getTag(); 14725 if (tag != null) { 14726 output += " (tag=" + tag + ")"; 14727 } 14728 Log.d(VIEW_LOG_TAG, output); 14729 14730 if ((mPrivateFlags & FOCUSED) != 0) { 14731 output = debugIndent(depth) + " FOCUSED"; 14732 Log.d(VIEW_LOG_TAG, output); 14733 } 14734 14735 output = debugIndent(depth); 14736 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14737 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14738 + "} "; 14739 Log.d(VIEW_LOG_TAG, output); 14740 14741 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14742 || mPaddingBottom != 0) { 14743 output = debugIndent(depth); 14744 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14745 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14746 Log.d(VIEW_LOG_TAG, output); 14747 } 14748 14749 output = debugIndent(depth); 14750 output += "mMeasureWidth=" + mMeasuredWidth + 14751 " mMeasureHeight=" + mMeasuredHeight; 14752 Log.d(VIEW_LOG_TAG, output); 14753 14754 output = debugIndent(depth); 14755 if (mLayoutParams == null) { 14756 output += "BAD! no layout params"; 14757 } else { 14758 output = mLayoutParams.debug(output); 14759 } 14760 Log.d(VIEW_LOG_TAG, output); 14761 14762 output = debugIndent(depth); 14763 output += "flags={"; 14764 output += View.printFlags(mViewFlags); 14765 output += "}"; 14766 Log.d(VIEW_LOG_TAG, output); 14767 14768 output = debugIndent(depth); 14769 output += "privateFlags={"; 14770 output += View.printPrivateFlags(mPrivateFlags); 14771 output += "}"; 14772 Log.d(VIEW_LOG_TAG, output); 14773 } 14774 14775 /** 14776 * Creates a string of whitespaces used for indentation. 14777 * 14778 * @param depth the indentation level 14779 * @return a String containing (depth * 2 + 3) * 2 white spaces 14780 * 14781 * @hide 14782 */ 14783 protected static String debugIndent(int depth) { 14784 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14785 for (int i = 0; i < (depth * 2) + 3; i++) { 14786 spaces.append(' ').append(' '); 14787 } 14788 return spaces.toString(); 14789 } 14790 14791 /** 14792 * <p>Return the offset of the widget's text baseline from the widget's top 14793 * boundary. If this widget does not support baseline alignment, this 14794 * method returns -1. </p> 14795 * 14796 * @return the offset of the baseline within the widget's bounds or -1 14797 * if baseline alignment is not supported 14798 */ 14799 @ViewDebug.ExportedProperty(category = "layout") 14800 public int getBaseline() { 14801 return -1; 14802 } 14803 14804 /** 14805 * Call this when something has changed which has invalidated the 14806 * layout of this view. This will schedule a layout pass of the view 14807 * tree. 14808 */ 14809 public void requestLayout() { 14810 if (ViewDebug.TRACE_HIERARCHY) { 14811 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14812 } 14813 14814 mPrivateFlags |= FORCE_LAYOUT; 14815 mPrivateFlags |= INVALIDATED; 14816 14817 if (mLayoutParams != null) { 14818 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14819 } 14820 14821 if (mParent != null && !mParent.isLayoutRequested()) { 14822 mParent.requestLayout(); 14823 } 14824 } 14825 14826 /** 14827 * Forces this view to be laid out during the next layout pass. 14828 * This method does not call requestLayout() or forceLayout() 14829 * on the parent. 14830 */ 14831 public void forceLayout() { 14832 mPrivateFlags |= FORCE_LAYOUT; 14833 mPrivateFlags |= INVALIDATED; 14834 } 14835 14836 /** 14837 * <p> 14838 * This is called to find out how big a view should be. The parent 14839 * supplies constraint information in the width and height parameters. 14840 * </p> 14841 * 14842 * <p> 14843 * The actual measurement work of a view is performed in 14844 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14845 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14846 * </p> 14847 * 14848 * 14849 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14850 * parent 14851 * @param heightMeasureSpec Vertical space requirements as imposed by the 14852 * parent 14853 * 14854 * @see #onMeasure(int, int) 14855 */ 14856 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14857 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14858 widthMeasureSpec != mOldWidthMeasureSpec || 14859 heightMeasureSpec != mOldHeightMeasureSpec) { 14860 14861 // first clears the measured dimension flag 14862 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14863 14864 if (ViewDebug.TRACE_HIERARCHY) { 14865 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14866 } 14867 14868 // measure ourselves, this should set the measured dimension flag back 14869 onMeasure(widthMeasureSpec, heightMeasureSpec); 14870 14871 // flag not set, setMeasuredDimension() was not invoked, we raise 14872 // an exception to warn the developer 14873 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14874 throw new IllegalStateException("onMeasure() did not set the" 14875 + " measured dimension by calling" 14876 + " setMeasuredDimension()"); 14877 } 14878 14879 mPrivateFlags |= LAYOUT_REQUIRED; 14880 } 14881 14882 mOldWidthMeasureSpec = widthMeasureSpec; 14883 mOldHeightMeasureSpec = heightMeasureSpec; 14884 } 14885 14886 /** 14887 * <p> 14888 * Measure the view and its content to determine the measured width and the 14889 * measured height. This method is invoked by {@link #measure(int, int)} and 14890 * should be overriden by subclasses to provide accurate and efficient 14891 * measurement of their contents. 14892 * </p> 14893 * 14894 * <p> 14895 * <strong>CONTRACT:</strong> When overriding this method, you 14896 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14897 * measured width and height of this view. Failure to do so will trigger an 14898 * <code>IllegalStateException</code>, thrown by 14899 * {@link #measure(int, int)}. Calling the superclass' 14900 * {@link #onMeasure(int, int)} is a valid use. 14901 * </p> 14902 * 14903 * <p> 14904 * The base class implementation of measure defaults to the background size, 14905 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14906 * override {@link #onMeasure(int, int)} to provide better measurements of 14907 * their content. 14908 * </p> 14909 * 14910 * <p> 14911 * If this method is overridden, it is the subclass's responsibility to make 14912 * sure the measured height and width are at least the view's minimum height 14913 * and width ({@link #getSuggestedMinimumHeight()} and 14914 * {@link #getSuggestedMinimumWidth()}). 14915 * </p> 14916 * 14917 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14918 * The requirements are encoded with 14919 * {@link android.view.View.MeasureSpec}. 14920 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14921 * The requirements are encoded with 14922 * {@link android.view.View.MeasureSpec}. 14923 * 14924 * @see #getMeasuredWidth() 14925 * @see #getMeasuredHeight() 14926 * @see #setMeasuredDimension(int, int) 14927 * @see #getSuggestedMinimumHeight() 14928 * @see #getSuggestedMinimumWidth() 14929 * @see android.view.View.MeasureSpec#getMode(int) 14930 * @see android.view.View.MeasureSpec#getSize(int) 14931 */ 14932 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 14933 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 14934 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 14935 } 14936 14937 /** 14938 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 14939 * measured width and measured height. Failing to do so will trigger an 14940 * exception at measurement time.</p> 14941 * 14942 * @param measuredWidth The measured width of this view. May be a complex 14943 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14944 * {@link #MEASURED_STATE_TOO_SMALL}. 14945 * @param measuredHeight The measured height of this view. May be a complex 14946 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14947 * {@link #MEASURED_STATE_TOO_SMALL}. 14948 */ 14949 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 14950 mMeasuredWidth = measuredWidth; 14951 mMeasuredHeight = measuredHeight; 14952 14953 mPrivateFlags |= MEASURED_DIMENSION_SET; 14954 } 14955 14956 /** 14957 * Merge two states as returned by {@link #getMeasuredState()}. 14958 * @param curState The current state as returned from a view or the result 14959 * of combining multiple views. 14960 * @param newState The new view state to combine. 14961 * @return Returns a new integer reflecting the combination of the two 14962 * states. 14963 */ 14964 public static int combineMeasuredStates(int curState, int newState) { 14965 return curState | newState; 14966 } 14967 14968 /** 14969 * Version of {@link #resolveSizeAndState(int, int, int)} 14970 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 14971 */ 14972 public static int resolveSize(int size, int measureSpec) { 14973 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 14974 } 14975 14976 /** 14977 * Utility to reconcile a desired size and state, with constraints imposed 14978 * by a MeasureSpec. Will take the desired size, unless a different size 14979 * is imposed by the constraints. The returned value is a compound integer, 14980 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 14981 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 14982 * size is smaller than the size the view wants to be. 14983 * 14984 * @param size How big the view wants to be 14985 * @param measureSpec Constraints imposed by the parent 14986 * @return Size information bit mask as defined by 14987 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 14988 */ 14989 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 14990 int result = size; 14991 int specMode = MeasureSpec.getMode(measureSpec); 14992 int specSize = MeasureSpec.getSize(measureSpec); 14993 switch (specMode) { 14994 case MeasureSpec.UNSPECIFIED: 14995 result = size; 14996 break; 14997 case MeasureSpec.AT_MOST: 14998 if (specSize < size) { 14999 result = specSize | MEASURED_STATE_TOO_SMALL; 15000 } else { 15001 result = size; 15002 } 15003 break; 15004 case MeasureSpec.EXACTLY: 15005 result = specSize; 15006 break; 15007 } 15008 return result | (childMeasuredState&MEASURED_STATE_MASK); 15009 } 15010 15011 /** 15012 * Utility to return a default size. Uses the supplied size if the 15013 * MeasureSpec imposed no constraints. Will get larger if allowed 15014 * by the MeasureSpec. 15015 * 15016 * @param size Default size for this view 15017 * @param measureSpec Constraints imposed by the parent 15018 * @return The size this view should be. 15019 */ 15020 public static int getDefaultSize(int size, int measureSpec) { 15021 int result = size; 15022 int specMode = MeasureSpec.getMode(measureSpec); 15023 int specSize = MeasureSpec.getSize(measureSpec); 15024 15025 switch (specMode) { 15026 case MeasureSpec.UNSPECIFIED: 15027 result = size; 15028 break; 15029 case MeasureSpec.AT_MOST: 15030 case MeasureSpec.EXACTLY: 15031 result = specSize; 15032 break; 15033 } 15034 return result; 15035 } 15036 15037 /** 15038 * Returns the suggested minimum height that the view should use. This 15039 * returns the maximum of the view's minimum height 15040 * and the background's minimum height 15041 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15042 * <p> 15043 * When being used in {@link #onMeasure(int, int)}, the caller should still 15044 * ensure the returned height is within the requirements of the parent. 15045 * 15046 * @return The suggested minimum height of the view. 15047 */ 15048 protected int getSuggestedMinimumHeight() { 15049 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15050 15051 } 15052 15053 /** 15054 * Returns the suggested minimum width that the view should use. This 15055 * returns the maximum of the view's minimum width) 15056 * and the background's minimum width 15057 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15058 * <p> 15059 * When being used in {@link #onMeasure(int, int)}, the caller should still 15060 * ensure the returned width is within the requirements of the parent. 15061 * 15062 * @return The suggested minimum width of the view. 15063 */ 15064 protected int getSuggestedMinimumWidth() { 15065 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15066 } 15067 15068 /** 15069 * Returns the minimum height of the view. 15070 * 15071 * @return the minimum height the view will try to be. 15072 * 15073 * @see #setMinimumHeight(int) 15074 * 15075 * @attr ref android.R.styleable#View_minHeight 15076 */ 15077 public int getMinimumHeight() { 15078 return mMinHeight; 15079 } 15080 15081 /** 15082 * Sets the minimum height of the view. It is not guaranteed the view will 15083 * be able to achieve this minimum height (for example, if its parent layout 15084 * constrains it with less available height). 15085 * 15086 * @param minHeight The minimum height the view will try to be. 15087 * 15088 * @see #getMinimumHeight() 15089 * 15090 * @attr ref android.R.styleable#View_minHeight 15091 */ 15092 public void setMinimumHeight(int minHeight) { 15093 mMinHeight = minHeight; 15094 requestLayout(); 15095 } 15096 15097 /** 15098 * Returns the minimum width of the view. 15099 * 15100 * @return the minimum width the view will try to be. 15101 * 15102 * @see #setMinimumWidth(int) 15103 * 15104 * @attr ref android.R.styleable#View_minWidth 15105 */ 15106 public int getMinimumWidth() { 15107 return mMinWidth; 15108 } 15109 15110 /** 15111 * Sets the minimum width of the view. It is not guaranteed the view will 15112 * be able to achieve this minimum width (for example, if its parent layout 15113 * constrains it with less available width). 15114 * 15115 * @param minWidth The minimum width the view will try to be. 15116 * 15117 * @see #getMinimumWidth() 15118 * 15119 * @attr ref android.R.styleable#View_minWidth 15120 */ 15121 public void setMinimumWidth(int minWidth) { 15122 mMinWidth = minWidth; 15123 requestLayout(); 15124 15125 } 15126 15127 /** 15128 * Get the animation currently associated with this view. 15129 * 15130 * @return The animation that is currently playing or 15131 * scheduled to play for this view. 15132 */ 15133 public Animation getAnimation() { 15134 return mCurrentAnimation; 15135 } 15136 15137 /** 15138 * Start the specified animation now. 15139 * 15140 * @param animation the animation to start now 15141 */ 15142 public void startAnimation(Animation animation) { 15143 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15144 setAnimation(animation); 15145 invalidateParentCaches(); 15146 invalidate(true); 15147 } 15148 15149 /** 15150 * Cancels any animations for this view. 15151 */ 15152 public void clearAnimation() { 15153 if (mCurrentAnimation != null) { 15154 mCurrentAnimation.detach(); 15155 } 15156 mCurrentAnimation = null; 15157 invalidateParentIfNeeded(); 15158 } 15159 15160 /** 15161 * Sets the next animation to play for this view. 15162 * If you want the animation to play immediately, use 15163 * startAnimation. This method provides allows fine-grained 15164 * control over the start time and invalidation, but you 15165 * must make sure that 1) the animation has a start time set, and 15166 * 2) the view will be invalidated when the animation is supposed to 15167 * start. 15168 * 15169 * @param animation The next animation, or null. 15170 */ 15171 public void setAnimation(Animation animation) { 15172 mCurrentAnimation = animation; 15173 15174 if (animation != null) { 15175 // If the screen is off assume the animation start time is now instead of 15176 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15177 // would cause the animation to start when the screen turns back on 15178 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15179 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15180 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15181 } 15182 animation.reset(); 15183 } 15184 } 15185 15186 /** 15187 * Invoked by a parent ViewGroup to notify the start of the animation 15188 * currently associated with this view. If you override this method, 15189 * always call super.onAnimationStart(); 15190 * 15191 * @see #setAnimation(android.view.animation.Animation) 15192 * @see #getAnimation() 15193 */ 15194 protected void onAnimationStart() { 15195 mPrivateFlags |= ANIMATION_STARTED; 15196 } 15197 15198 /** 15199 * Invoked by a parent ViewGroup to notify the end of the animation 15200 * currently associated with this view. If you override this method, 15201 * always call super.onAnimationEnd(); 15202 * 15203 * @see #setAnimation(android.view.animation.Animation) 15204 * @see #getAnimation() 15205 */ 15206 protected void onAnimationEnd() { 15207 mPrivateFlags &= ~ANIMATION_STARTED; 15208 } 15209 15210 /** 15211 * Invoked if there is a Transform that involves alpha. Subclass that can 15212 * draw themselves with the specified alpha should return true, and then 15213 * respect that alpha when their onDraw() is called. If this returns false 15214 * then the view may be redirected to draw into an offscreen buffer to 15215 * fulfill the request, which will look fine, but may be slower than if the 15216 * subclass handles it internally. The default implementation returns false. 15217 * 15218 * @param alpha The alpha (0..255) to apply to the view's drawing 15219 * @return true if the view can draw with the specified alpha. 15220 */ 15221 protected boolean onSetAlpha(int alpha) { 15222 return false; 15223 } 15224 15225 /** 15226 * This is used by the RootView to perform an optimization when 15227 * the view hierarchy contains one or several SurfaceView. 15228 * SurfaceView is always considered transparent, but its children are not, 15229 * therefore all View objects remove themselves from the global transparent 15230 * region (passed as a parameter to this function). 15231 * 15232 * @param region The transparent region for this ViewAncestor (window). 15233 * 15234 * @return Returns true if the effective visibility of the view at this 15235 * point is opaque, regardless of the transparent region; returns false 15236 * if it is possible for underlying windows to be seen behind the view. 15237 * 15238 * {@hide} 15239 */ 15240 public boolean gatherTransparentRegion(Region region) { 15241 final AttachInfo attachInfo = mAttachInfo; 15242 if (region != null && attachInfo != null) { 15243 final int pflags = mPrivateFlags; 15244 if ((pflags & SKIP_DRAW) == 0) { 15245 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15246 // remove it from the transparent region. 15247 final int[] location = attachInfo.mTransparentLocation; 15248 getLocationInWindow(location); 15249 region.op(location[0], location[1], location[0] + mRight - mLeft, 15250 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15251 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15252 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15253 // exists, so we remove the background drawable's non-transparent 15254 // parts from this transparent region. 15255 applyDrawableToTransparentRegion(mBackground, region); 15256 } 15257 } 15258 return true; 15259 } 15260 15261 /** 15262 * Play a sound effect for this view. 15263 * 15264 * <p>The framework will play sound effects for some built in actions, such as 15265 * clicking, but you may wish to play these effects in your widget, 15266 * for instance, for internal navigation. 15267 * 15268 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15269 * {@link #isSoundEffectsEnabled()} is true. 15270 * 15271 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15272 */ 15273 public void playSoundEffect(int soundConstant) { 15274 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15275 return; 15276 } 15277 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15278 } 15279 15280 /** 15281 * BZZZTT!!1! 15282 * 15283 * <p>Provide haptic feedback to the user for this view. 15284 * 15285 * <p>The framework will provide haptic feedback for some built in actions, 15286 * such as long presses, but you may wish to provide feedback for your 15287 * own widget. 15288 * 15289 * <p>The feedback will only be performed if 15290 * {@link #isHapticFeedbackEnabled()} is true. 15291 * 15292 * @param feedbackConstant One of the constants defined in 15293 * {@link HapticFeedbackConstants} 15294 */ 15295 public boolean performHapticFeedback(int feedbackConstant) { 15296 return performHapticFeedback(feedbackConstant, 0); 15297 } 15298 15299 /** 15300 * BZZZTT!!1! 15301 * 15302 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15303 * 15304 * @param feedbackConstant One of the constants defined in 15305 * {@link HapticFeedbackConstants} 15306 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15307 */ 15308 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15309 if (mAttachInfo == null) { 15310 return false; 15311 } 15312 //noinspection SimplifiableIfStatement 15313 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15314 && !isHapticFeedbackEnabled()) { 15315 return false; 15316 } 15317 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15318 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15319 } 15320 15321 /** 15322 * Request that the visibility of the status bar or other screen/window 15323 * decorations be changed. 15324 * 15325 * <p>This method is used to put the over device UI into temporary modes 15326 * where the user's attention is focused more on the application content, 15327 * by dimming or hiding surrounding system affordances. This is typically 15328 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15329 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15330 * to be placed behind the action bar (and with these flags other system 15331 * affordances) so that smooth transitions between hiding and showing them 15332 * can be done. 15333 * 15334 * <p>Two representative examples of the use of system UI visibility is 15335 * implementing a content browsing application (like a magazine reader) 15336 * and a video playing application. 15337 * 15338 * <p>The first code shows a typical implementation of a View in a content 15339 * browsing application. In this implementation, the application goes 15340 * into a content-oriented mode by hiding the status bar and action bar, 15341 * and putting the navigation elements into lights out mode. The user can 15342 * then interact with content while in this mode. Such an application should 15343 * provide an easy way for the user to toggle out of the mode (such as to 15344 * check information in the status bar or access notifications). In the 15345 * implementation here, this is done simply by tapping on the content. 15346 * 15347 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15348 * content} 15349 * 15350 * <p>This second code sample shows a typical implementation of a View 15351 * in a video playing application. In this situation, while the video is 15352 * playing the application would like to go into a complete full-screen mode, 15353 * to use as much of the display as possible for the video. When in this state 15354 * the user can not interact with the application; the system intercepts 15355 * touching on the screen to pop the UI out of full screen mode. 15356 * 15357 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15358 * content} 15359 * 15360 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15361 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15362 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15363 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15364 */ 15365 public void setSystemUiVisibility(int visibility) { 15366 if (visibility != mSystemUiVisibility) { 15367 mSystemUiVisibility = visibility; 15368 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15369 mParent.recomputeViewAttributes(this); 15370 } 15371 } 15372 } 15373 15374 /** 15375 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15376 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15377 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15378 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15379 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15380 */ 15381 public int getSystemUiVisibility() { 15382 return mSystemUiVisibility; 15383 } 15384 15385 /** 15386 * Returns the current system UI visibility that is currently set for 15387 * the entire window. This is the combination of the 15388 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15389 * views in the window. 15390 */ 15391 public int getWindowSystemUiVisibility() { 15392 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15393 } 15394 15395 /** 15396 * Override to find out when the window's requested system UI visibility 15397 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15398 * This is different from the callbacks recieved through 15399 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15400 * in that this is only telling you about the local request of the window, 15401 * not the actual values applied by the system. 15402 */ 15403 public void onWindowSystemUiVisibilityChanged(int visible) { 15404 } 15405 15406 /** 15407 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15408 * the view hierarchy. 15409 */ 15410 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15411 onWindowSystemUiVisibilityChanged(visible); 15412 } 15413 15414 /** 15415 * Set a listener to receive callbacks when the visibility of the system bar changes. 15416 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15417 */ 15418 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15419 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15420 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15421 mParent.recomputeViewAttributes(this); 15422 } 15423 } 15424 15425 /** 15426 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15427 * the view hierarchy. 15428 */ 15429 public void dispatchSystemUiVisibilityChanged(int visibility) { 15430 ListenerInfo li = mListenerInfo; 15431 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15432 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15433 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15434 } 15435 } 15436 15437 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 15438 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15439 if (val != mSystemUiVisibility) { 15440 setSystemUiVisibility(val); 15441 } 15442 } 15443 15444 /** @hide */ 15445 public void setDisabledSystemUiVisibility(int flags) { 15446 if (mAttachInfo != null) { 15447 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15448 mAttachInfo.mDisabledSystemUiVisibility = flags; 15449 if (mParent != null) { 15450 mParent.recomputeViewAttributes(this); 15451 } 15452 } 15453 } 15454 } 15455 15456 /** 15457 * Creates an image that the system displays during the drag and drop 15458 * operation. This is called a "drag shadow". The default implementation 15459 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15460 * appearance as the given View. The default also positions the center of the drag shadow 15461 * directly under the touch point. If no View is provided (the constructor with no parameters 15462 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15463 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15464 * default is an invisible drag shadow. 15465 * <p> 15466 * You are not required to use the View you provide to the constructor as the basis of the 15467 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15468 * anything you want as the drag shadow. 15469 * </p> 15470 * <p> 15471 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15472 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15473 * size and position of the drag shadow. It uses this data to construct a 15474 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15475 * so that your application can draw the shadow image in the Canvas. 15476 * </p> 15477 * 15478 * <div class="special reference"> 15479 * <h3>Developer Guides</h3> 15480 * <p>For a guide to implementing drag and drop features, read the 15481 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15482 * </div> 15483 */ 15484 public static class DragShadowBuilder { 15485 private final WeakReference<View> mView; 15486 15487 /** 15488 * Constructs a shadow image builder based on a View. By default, the resulting drag 15489 * shadow will have the same appearance and dimensions as the View, with the touch point 15490 * over the center of the View. 15491 * @param view A View. Any View in scope can be used. 15492 */ 15493 public DragShadowBuilder(View view) { 15494 mView = new WeakReference<View>(view); 15495 } 15496 15497 /** 15498 * Construct a shadow builder object with no associated View. This 15499 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15500 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15501 * to supply the drag shadow's dimensions and appearance without 15502 * reference to any View object. If they are not overridden, then the result is an 15503 * invisible drag shadow. 15504 */ 15505 public DragShadowBuilder() { 15506 mView = new WeakReference<View>(null); 15507 } 15508 15509 /** 15510 * Returns the View object that had been passed to the 15511 * {@link #View.DragShadowBuilder(View)} 15512 * constructor. If that View parameter was {@code null} or if the 15513 * {@link #View.DragShadowBuilder()} 15514 * constructor was used to instantiate the builder object, this method will return 15515 * null. 15516 * 15517 * @return The View object associate with this builder object. 15518 */ 15519 @SuppressWarnings({"JavadocReference"}) 15520 final public View getView() { 15521 return mView.get(); 15522 } 15523 15524 /** 15525 * Provides the metrics for the shadow image. These include the dimensions of 15526 * the shadow image, and the point within that shadow that should 15527 * be centered under the touch location while dragging. 15528 * <p> 15529 * The default implementation sets the dimensions of the shadow to be the 15530 * same as the dimensions of the View itself and centers the shadow under 15531 * the touch point. 15532 * </p> 15533 * 15534 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15535 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15536 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15537 * image. 15538 * 15539 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15540 * shadow image that should be underneath the touch point during the drag and drop 15541 * operation. Your application must set {@link android.graphics.Point#x} to the 15542 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15543 */ 15544 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15545 final View view = mView.get(); 15546 if (view != null) { 15547 shadowSize.set(view.getWidth(), view.getHeight()); 15548 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15549 } else { 15550 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15551 } 15552 } 15553 15554 /** 15555 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15556 * based on the dimensions it received from the 15557 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15558 * 15559 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15560 */ 15561 public void onDrawShadow(Canvas canvas) { 15562 final View view = mView.get(); 15563 if (view != null) { 15564 view.draw(canvas); 15565 } else { 15566 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15567 } 15568 } 15569 } 15570 15571 /** 15572 * Starts a drag and drop operation. When your application calls this method, it passes a 15573 * {@link android.view.View.DragShadowBuilder} object to the system. The 15574 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15575 * to get metrics for the drag shadow, and then calls the object's 15576 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15577 * <p> 15578 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15579 * drag events to all the View objects in your application that are currently visible. It does 15580 * this either by calling the View object's drag listener (an implementation of 15581 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15582 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15583 * Both are passed a {@link android.view.DragEvent} object that has a 15584 * {@link android.view.DragEvent#getAction()} value of 15585 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15586 * </p> 15587 * <p> 15588 * Your application can invoke startDrag() on any attached View object. The View object does not 15589 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15590 * be related to the View the user selected for dragging. 15591 * </p> 15592 * @param data A {@link android.content.ClipData} object pointing to the data to be 15593 * transferred by the drag and drop operation. 15594 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15595 * drag shadow. 15596 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15597 * drop operation. This Object is put into every DragEvent object sent by the system during the 15598 * current drag. 15599 * <p> 15600 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15601 * to the target Views. For example, it can contain flags that differentiate between a 15602 * a copy operation and a move operation. 15603 * </p> 15604 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15605 * so the parameter should be set to 0. 15606 * @return {@code true} if the method completes successfully, or 15607 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15608 * do a drag, and so no drag operation is in progress. 15609 */ 15610 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15611 Object myLocalState, int flags) { 15612 if (ViewDebug.DEBUG_DRAG) { 15613 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15614 } 15615 boolean okay = false; 15616 15617 Point shadowSize = new Point(); 15618 Point shadowTouchPoint = new Point(); 15619 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15620 15621 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15622 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15623 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15624 } 15625 15626 if (ViewDebug.DEBUG_DRAG) { 15627 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15628 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15629 } 15630 Surface surface = new Surface(); 15631 try { 15632 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15633 flags, shadowSize.x, shadowSize.y, surface); 15634 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15635 + " surface=" + surface); 15636 if (token != null) { 15637 Canvas canvas = surface.lockCanvas(null); 15638 try { 15639 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15640 shadowBuilder.onDrawShadow(canvas); 15641 } finally { 15642 surface.unlockCanvasAndPost(canvas); 15643 } 15644 15645 final ViewRootImpl root = getViewRootImpl(); 15646 15647 // Cache the local state object for delivery with DragEvents 15648 root.setLocalDragState(myLocalState); 15649 15650 // repurpose 'shadowSize' for the last touch point 15651 root.getLastTouchPoint(shadowSize); 15652 15653 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15654 shadowSize.x, shadowSize.y, 15655 shadowTouchPoint.x, shadowTouchPoint.y, data); 15656 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15657 15658 // Off and running! Release our local surface instance; the drag 15659 // shadow surface is now managed by the system process. 15660 surface.release(); 15661 } 15662 } catch (Exception e) { 15663 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15664 surface.destroy(); 15665 } 15666 15667 return okay; 15668 } 15669 15670 /** 15671 * Handles drag events sent by the system following a call to 15672 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15673 *<p> 15674 * When the system calls this method, it passes a 15675 * {@link android.view.DragEvent} object. A call to 15676 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15677 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15678 * operation. 15679 * @param event The {@link android.view.DragEvent} sent by the system. 15680 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15681 * in DragEvent, indicating the type of drag event represented by this object. 15682 * @return {@code true} if the method was successful, otherwise {@code false}. 15683 * <p> 15684 * The method should return {@code true} in response to an action type of 15685 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15686 * operation. 15687 * </p> 15688 * <p> 15689 * The method should also return {@code true} in response to an action type of 15690 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15691 * {@code false} if it didn't. 15692 * </p> 15693 */ 15694 public boolean onDragEvent(DragEvent event) { 15695 return false; 15696 } 15697 15698 /** 15699 * Detects if this View is enabled and has a drag event listener. 15700 * If both are true, then it calls the drag event listener with the 15701 * {@link android.view.DragEvent} it received. If the drag event listener returns 15702 * {@code true}, then dispatchDragEvent() returns {@code true}. 15703 * <p> 15704 * For all other cases, the method calls the 15705 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15706 * method and returns its result. 15707 * </p> 15708 * <p> 15709 * This ensures that a drag event is always consumed, even if the View does not have a drag 15710 * event listener. However, if the View has a listener and the listener returns true, then 15711 * onDragEvent() is not called. 15712 * </p> 15713 */ 15714 public boolean dispatchDragEvent(DragEvent event) { 15715 //noinspection SimplifiableIfStatement 15716 ListenerInfo li = mListenerInfo; 15717 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15718 && li.mOnDragListener.onDrag(this, event)) { 15719 return true; 15720 } 15721 return onDragEvent(event); 15722 } 15723 15724 boolean canAcceptDrag() { 15725 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15726 } 15727 15728 /** 15729 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15730 * it is ever exposed at all. 15731 * @hide 15732 */ 15733 public void onCloseSystemDialogs(String reason) { 15734 } 15735 15736 /** 15737 * Given a Drawable whose bounds have been set to draw into this view, 15738 * update a Region being computed for 15739 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15740 * that any non-transparent parts of the Drawable are removed from the 15741 * given transparent region. 15742 * 15743 * @param dr The Drawable whose transparency is to be applied to the region. 15744 * @param region A Region holding the current transparency information, 15745 * where any parts of the region that are set are considered to be 15746 * transparent. On return, this region will be modified to have the 15747 * transparency information reduced by the corresponding parts of the 15748 * Drawable that are not transparent. 15749 * {@hide} 15750 */ 15751 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15752 if (DBG) { 15753 Log.i("View", "Getting transparent region for: " + this); 15754 } 15755 final Region r = dr.getTransparentRegion(); 15756 final Rect db = dr.getBounds(); 15757 final AttachInfo attachInfo = mAttachInfo; 15758 if (r != null && attachInfo != null) { 15759 final int w = getRight()-getLeft(); 15760 final int h = getBottom()-getTop(); 15761 if (db.left > 0) { 15762 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15763 r.op(0, 0, db.left, h, Region.Op.UNION); 15764 } 15765 if (db.right < w) { 15766 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15767 r.op(db.right, 0, w, h, Region.Op.UNION); 15768 } 15769 if (db.top > 0) { 15770 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15771 r.op(0, 0, w, db.top, Region.Op.UNION); 15772 } 15773 if (db.bottom < h) { 15774 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15775 r.op(0, db.bottom, w, h, Region.Op.UNION); 15776 } 15777 final int[] location = attachInfo.mTransparentLocation; 15778 getLocationInWindow(location); 15779 r.translate(location[0], location[1]); 15780 region.op(r, Region.Op.INTERSECT); 15781 } else { 15782 region.op(db, Region.Op.DIFFERENCE); 15783 } 15784 } 15785 15786 private void checkForLongClick(int delayOffset) { 15787 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15788 mHasPerformedLongPress = false; 15789 15790 if (mPendingCheckForLongPress == null) { 15791 mPendingCheckForLongPress = new CheckForLongPress(); 15792 } 15793 mPendingCheckForLongPress.rememberWindowAttachCount(); 15794 postDelayed(mPendingCheckForLongPress, 15795 ViewConfiguration.getLongPressTimeout() - delayOffset); 15796 } 15797 } 15798 15799 /** 15800 * Inflate a view from an XML resource. This convenience method wraps the {@link 15801 * LayoutInflater} class, which provides a full range of options for view inflation. 15802 * 15803 * @param context The Context object for your activity or application. 15804 * @param resource The resource ID to inflate 15805 * @param root A view group that will be the parent. Used to properly inflate the 15806 * layout_* parameters. 15807 * @see LayoutInflater 15808 */ 15809 public static View inflate(Context context, int resource, ViewGroup root) { 15810 LayoutInflater factory = LayoutInflater.from(context); 15811 return factory.inflate(resource, root); 15812 } 15813 15814 /** 15815 * Scroll the view with standard behavior for scrolling beyond the normal 15816 * content boundaries. Views that call this method should override 15817 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15818 * results of an over-scroll operation. 15819 * 15820 * Views can use this method to handle any touch or fling-based scrolling. 15821 * 15822 * @param deltaX Change in X in pixels 15823 * @param deltaY Change in Y in pixels 15824 * @param scrollX Current X scroll value in pixels before applying deltaX 15825 * @param scrollY Current Y scroll value in pixels before applying deltaY 15826 * @param scrollRangeX Maximum content scroll range along the X axis 15827 * @param scrollRangeY Maximum content scroll range along the Y axis 15828 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15829 * along the X axis. 15830 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15831 * along the Y axis. 15832 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15833 * @return true if scrolling was clamped to an over-scroll boundary along either 15834 * axis, false otherwise. 15835 */ 15836 @SuppressWarnings({"UnusedParameters"}) 15837 protected boolean overScrollBy(int deltaX, int deltaY, 15838 int scrollX, int scrollY, 15839 int scrollRangeX, int scrollRangeY, 15840 int maxOverScrollX, int maxOverScrollY, 15841 boolean isTouchEvent) { 15842 final int overScrollMode = mOverScrollMode; 15843 final boolean canScrollHorizontal = 15844 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15845 final boolean canScrollVertical = 15846 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15847 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15848 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15849 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15850 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15851 15852 int newScrollX = scrollX + deltaX; 15853 if (!overScrollHorizontal) { 15854 maxOverScrollX = 0; 15855 } 15856 15857 int newScrollY = scrollY + deltaY; 15858 if (!overScrollVertical) { 15859 maxOverScrollY = 0; 15860 } 15861 15862 // Clamp values if at the limits and record 15863 final int left = -maxOverScrollX; 15864 final int right = maxOverScrollX + scrollRangeX; 15865 final int top = -maxOverScrollY; 15866 final int bottom = maxOverScrollY + scrollRangeY; 15867 15868 boolean clampedX = false; 15869 if (newScrollX > right) { 15870 newScrollX = right; 15871 clampedX = true; 15872 } else if (newScrollX < left) { 15873 newScrollX = left; 15874 clampedX = true; 15875 } 15876 15877 boolean clampedY = false; 15878 if (newScrollY > bottom) { 15879 newScrollY = bottom; 15880 clampedY = true; 15881 } else if (newScrollY < top) { 15882 newScrollY = top; 15883 clampedY = true; 15884 } 15885 15886 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15887 15888 return clampedX || clampedY; 15889 } 15890 15891 /** 15892 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15893 * respond to the results of an over-scroll operation. 15894 * 15895 * @param scrollX New X scroll value in pixels 15896 * @param scrollY New Y scroll value in pixels 15897 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15898 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15899 */ 15900 protected void onOverScrolled(int scrollX, int scrollY, 15901 boolean clampedX, boolean clampedY) { 15902 // Intentionally empty. 15903 } 15904 15905 /** 15906 * Returns the over-scroll mode for this view. The result will be 15907 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15908 * (allow over-scrolling only if the view content is larger than the container), 15909 * or {@link #OVER_SCROLL_NEVER}. 15910 * 15911 * @return This view's over-scroll mode. 15912 */ 15913 public int getOverScrollMode() { 15914 return mOverScrollMode; 15915 } 15916 15917 /** 15918 * Set the over-scroll mode for this view. Valid over-scroll modes are 15919 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15920 * (allow over-scrolling only if the view content is larger than the container), 15921 * or {@link #OVER_SCROLL_NEVER}. 15922 * 15923 * Setting the over-scroll mode of a view will have an effect only if the 15924 * view is capable of scrolling. 15925 * 15926 * @param overScrollMode The new over-scroll mode for this view. 15927 */ 15928 public void setOverScrollMode(int overScrollMode) { 15929 if (overScrollMode != OVER_SCROLL_ALWAYS && 15930 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 15931 overScrollMode != OVER_SCROLL_NEVER) { 15932 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 15933 } 15934 mOverScrollMode = overScrollMode; 15935 } 15936 15937 /** 15938 * Gets a scale factor that determines the distance the view should scroll 15939 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 15940 * @return The vertical scroll scale factor. 15941 * @hide 15942 */ 15943 protected float getVerticalScrollFactor() { 15944 if (mVerticalScrollFactor == 0) { 15945 TypedValue outValue = new TypedValue(); 15946 if (!mContext.getTheme().resolveAttribute( 15947 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 15948 throw new IllegalStateException( 15949 "Expected theme to define listPreferredItemHeight."); 15950 } 15951 mVerticalScrollFactor = outValue.getDimension( 15952 mContext.getResources().getDisplayMetrics()); 15953 } 15954 return mVerticalScrollFactor; 15955 } 15956 15957 /** 15958 * Gets a scale factor that determines the distance the view should scroll 15959 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 15960 * @return The horizontal scroll scale factor. 15961 * @hide 15962 */ 15963 protected float getHorizontalScrollFactor() { 15964 // TODO: Should use something else. 15965 return getVerticalScrollFactor(); 15966 } 15967 15968 /** 15969 * Return the value specifying the text direction or policy that was set with 15970 * {@link #setTextDirection(int)}. 15971 * 15972 * @return the defined text direction. It can be one of: 15973 * 15974 * {@link #TEXT_DIRECTION_INHERIT}, 15975 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15976 * {@link #TEXT_DIRECTION_ANY_RTL}, 15977 * {@link #TEXT_DIRECTION_LTR}, 15978 * {@link #TEXT_DIRECTION_RTL}, 15979 * {@link #TEXT_DIRECTION_LOCALE} 15980 */ 15981 @ViewDebug.ExportedProperty(category = "text", mapping = { 15982 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 15983 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 15984 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 15985 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 15986 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 15987 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 15988 }) 15989 public int getTextDirection() { 15990 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 15991 } 15992 15993 /** 15994 * Set the text direction. 15995 * 15996 * @param textDirection the direction to set. Should be one of: 15997 * 15998 * {@link #TEXT_DIRECTION_INHERIT}, 15999 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16000 * {@link #TEXT_DIRECTION_ANY_RTL}, 16001 * {@link #TEXT_DIRECTION_LTR}, 16002 * {@link #TEXT_DIRECTION_RTL}, 16003 * {@link #TEXT_DIRECTION_LOCALE} 16004 */ 16005 public void setTextDirection(int textDirection) { 16006 if (getTextDirection() != textDirection) { 16007 // Reset the current text direction and the resolved one 16008 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16009 resetResolvedTextDirection(); 16010 // Set the new text direction 16011 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16012 // Refresh 16013 requestLayout(); 16014 invalidate(true); 16015 } 16016 } 16017 16018 /** 16019 * Return the resolved text direction. 16020 * 16021 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16022 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16023 * up the parent chain of the view. if there is no parent, then it will return the default 16024 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16025 * 16026 * @return the resolved text direction. Returns one of: 16027 * 16028 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16029 * {@link #TEXT_DIRECTION_ANY_RTL}, 16030 * {@link #TEXT_DIRECTION_LTR}, 16031 * {@link #TEXT_DIRECTION_RTL}, 16032 * {@link #TEXT_DIRECTION_LOCALE} 16033 */ 16034 public int getResolvedTextDirection() { 16035 // The text direction will be resolved only if needed 16036 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16037 resolveTextDirection(); 16038 } 16039 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16040 } 16041 16042 /** 16043 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16044 * resolution is done. 16045 */ 16046 public void resolveTextDirection() { 16047 // Reset any previous text direction resolution 16048 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16049 16050 if (hasRtlSupport()) { 16051 // Set resolved text direction flag depending on text direction flag 16052 final int textDirection = getTextDirection(); 16053 switch(textDirection) { 16054 case TEXT_DIRECTION_INHERIT: 16055 if (canResolveTextDirection()) { 16056 ViewGroup viewGroup = ((ViewGroup) mParent); 16057 16058 // Set current resolved direction to the same value as the parent's one 16059 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16060 switch (parentResolvedDirection) { 16061 case TEXT_DIRECTION_FIRST_STRONG: 16062 case TEXT_DIRECTION_ANY_RTL: 16063 case TEXT_DIRECTION_LTR: 16064 case TEXT_DIRECTION_RTL: 16065 case TEXT_DIRECTION_LOCALE: 16066 mPrivateFlags2 |= 16067 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16068 break; 16069 default: 16070 // Default resolved direction is "first strong" heuristic 16071 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16072 } 16073 } else { 16074 // We cannot do the resolution if there is no parent, so use the default one 16075 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16076 } 16077 break; 16078 case TEXT_DIRECTION_FIRST_STRONG: 16079 case TEXT_DIRECTION_ANY_RTL: 16080 case TEXT_DIRECTION_LTR: 16081 case TEXT_DIRECTION_RTL: 16082 case TEXT_DIRECTION_LOCALE: 16083 // Resolved direction is the same as text direction 16084 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16085 break; 16086 default: 16087 // Default resolved direction is "first strong" heuristic 16088 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16089 } 16090 } else { 16091 // Default resolved direction is "first strong" heuristic 16092 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16093 } 16094 16095 // Set to resolved 16096 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16097 onResolvedTextDirectionChanged(); 16098 } 16099 16100 /** 16101 * Called when text direction has been resolved. Subclasses that care about text direction 16102 * resolution should override this method. 16103 * 16104 * The default implementation does nothing. 16105 */ 16106 public void onResolvedTextDirectionChanged() { 16107 } 16108 16109 /** 16110 * Check if text direction resolution can be done. 16111 * 16112 * @return true if text direction resolution can be done otherwise return false. 16113 */ 16114 public boolean canResolveTextDirection() { 16115 switch (getTextDirection()) { 16116 case TEXT_DIRECTION_INHERIT: 16117 return (mParent != null) && (mParent instanceof ViewGroup); 16118 default: 16119 return true; 16120 } 16121 } 16122 16123 /** 16124 * Reset resolved text direction. Text direction can be resolved with a call to 16125 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16126 * reset is done. 16127 */ 16128 public void resetResolvedTextDirection() { 16129 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16130 onResolvedTextDirectionReset(); 16131 } 16132 16133 /** 16134 * Called when text direction is reset. Subclasses that care about text direction reset should 16135 * override this method and do a reset of the text direction of their children. The default 16136 * implementation does nothing. 16137 */ 16138 public void onResolvedTextDirectionReset() { 16139 } 16140 16141 /** 16142 * Return the value specifying the text alignment or policy that was set with 16143 * {@link #setTextAlignment(int)}. 16144 * 16145 * @return the defined text alignment. It can be one of: 16146 * 16147 * {@link #TEXT_ALIGNMENT_INHERIT}, 16148 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16149 * {@link #TEXT_ALIGNMENT_CENTER}, 16150 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16151 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16152 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16153 * {@link #TEXT_ALIGNMENT_VIEW_END} 16154 */ 16155 @ViewDebug.ExportedProperty(category = "text", mapping = { 16156 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16157 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16158 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16159 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16160 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16161 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16162 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16163 }) 16164 public int getTextAlignment() { 16165 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16166 } 16167 16168 /** 16169 * Set the text alignment. 16170 * 16171 * @param textAlignment The text alignment to set. Should be one of 16172 * 16173 * {@link #TEXT_ALIGNMENT_INHERIT}, 16174 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16175 * {@link #TEXT_ALIGNMENT_CENTER}, 16176 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16177 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16178 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16179 * {@link #TEXT_ALIGNMENT_VIEW_END} 16180 * 16181 * @attr ref android.R.styleable#View_textAlignment 16182 */ 16183 public void setTextAlignment(int textAlignment) { 16184 if (textAlignment != getTextAlignment()) { 16185 // Reset the current and resolved text alignment 16186 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16187 resetResolvedTextAlignment(); 16188 // Set the new text alignment 16189 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16190 // Refresh 16191 requestLayout(); 16192 invalidate(true); 16193 } 16194 } 16195 16196 /** 16197 * Return the resolved text alignment. 16198 * 16199 * The resolved text alignment. This needs resolution if the value is 16200 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16201 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16202 * 16203 * @return the resolved text alignment. Returns one of: 16204 * 16205 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16206 * {@link #TEXT_ALIGNMENT_CENTER}, 16207 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16208 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16209 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16210 * {@link #TEXT_ALIGNMENT_VIEW_END} 16211 */ 16212 @ViewDebug.ExportedProperty(category = "text", mapping = { 16213 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16214 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16215 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16216 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16217 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16218 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16219 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16220 }) 16221 public int getResolvedTextAlignment() { 16222 // If text alignment is not resolved, then resolve it 16223 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16224 resolveTextAlignment(); 16225 } 16226 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16227 } 16228 16229 /** 16230 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16231 * resolution is done. 16232 */ 16233 public void resolveTextAlignment() { 16234 // Reset any previous text alignment resolution 16235 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16236 16237 if (hasRtlSupport()) { 16238 // Set resolved text alignment flag depending on text alignment flag 16239 final int textAlignment = getTextAlignment(); 16240 switch (textAlignment) { 16241 case TEXT_ALIGNMENT_INHERIT: 16242 // Check if we can resolve the text alignment 16243 if (canResolveLayoutDirection() && mParent instanceof View) { 16244 View view = (View) mParent; 16245 16246 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16247 switch (parentResolvedTextAlignment) { 16248 case TEXT_ALIGNMENT_GRAVITY: 16249 case TEXT_ALIGNMENT_TEXT_START: 16250 case TEXT_ALIGNMENT_TEXT_END: 16251 case TEXT_ALIGNMENT_CENTER: 16252 case TEXT_ALIGNMENT_VIEW_START: 16253 case TEXT_ALIGNMENT_VIEW_END: 16254 // Resolved text alignment is the same as the parent resolved 16255 // text alignment 16256 mPrivateFlags2 |= 16257 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16258 break; 16259 default: 16260 // Use default resolved text alignment 16261 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16262 } 16263 } 16264 else { 16265 // We cannot do the resolution if there is no parent so use the default 16266 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16267 } 16268 break; 16269 case TEXT_ALIGNMENT_GRAVITY: 16270 case TEXT_ALIGNMENT_TEXT_START: 16271 case TEXT_ALIGNMENT_TEXT_END: 16272 case TEXT_ALIGNMENT_CENTER: 16273 case TEXT_ALIGNMENT_VIEW_START: 16274 case TEXT_ALIGNMENT_VIEW_END: 16275 // Resolved text alignment is the same as text alignment 16276 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16277 break; 16278 default: 16279 // Use default resolved text alignment 16280 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16281 } 16282 } else { 16283 // Use default resolved text alignment 16284 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16285 } 16286 16287 // Set the resolved 16288 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16289 onResolvedTextAlignmentChanged(); 16290 } 16291 16292 /** 16293 * Check if text alignment resolution can be done. 16294 * 16295 * @return true if text alignment resolution can be done otherwise return false. 16296 */ 16297 public boolean canResolveTextAlignment() { 16298 switch (getTextAlignment()) { 16299 case TEXT_DIRECTION_INHERIT: 16300 return (mParent != null); 16301 default: 16302 return true; 16303 } 16304 } 16305 16306 /** 16307 * Called when text alignment has been resolved. Subclasses that care about text alignment 16308 * resolution should override this method. 16309 * 16310 * The default implementation does nothing. 16311 */ 16312 public void onResolvedTextAlignmentChanged() { 16313 } 16314 16315 /** 16316 * Reset resolved text alignment. Text alignment can be resolved with a call to 16317 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16318 * reset is done. 16319 */ 16320 public void resetResolvedTextAlignment() { 16321 // Reset any previous text alignment resolution 16322 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16323 onResolvedTextAlignmentReset(); 16324 } 16325 16326 /** 16327 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16328 * override this method and do a reset of the text alignment of their children. The default 16329 * implementation does nothing. 16330 */ 16331 public void onResolvedTextAlignmentReset() { 16332 } 16333 16334 // 16335 // Properties 16336 // 16337 /** 16338 * A Property wrapper around the <code>alpha</code> functionality handled by the 16339 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16340 */ 16341 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16342 @Override 16343 public void setValue(View object, float value) { 16344 object.setAlpha(value); 16345 } 16346 16347 @Override 16348 public Float get(View object) { 16349 return object.getAlpha(); 16350 } 16351 }; 16352 16353 /** 16354 * A Property wrapper around the <code>translationX</code> functionality handled by the 16355 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16356 */ 16357 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16358 @Override 16359 public void setValue(View object, float value) { 16360 object.setTranslationX(value); 16361 } 16362 16363 @Override 16364 public Float get(View object) { 16365 return object.getTranslationX(); 16366 } 16367 }; 16368 16369 /** 16370 * A Property wrapper around the <code>translationY</code> functionality handled by the 16371 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16372 */ 16373 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16374 @Override 16375 public void setValue(View object, float value) { 16376 object.setTranslationY(value); 16377 } 16378 16379 @Override 16380 public Float get(View object) { 16381 return object.getTranslationY(); 16382 } 16383 }; 16384 16385 /** 16386 * A Property wrapper around the <code>x</code> functionality handled by the 16387 * {@link View#setX(float)} and {@link View#getX()} methods. 16388 */ 16389 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16390 @Override 16391 public void setValue(View object, float value) { 16392 object.setX(value); 16393 } 16394 16395 @Override 16396 public Float get(View object) { 16397 return object.getX(); 16398 } 16399 }; 16400 16401 /** 16402 * A Property wrapper around the <code>y</code> functionality handled by the 16403 * {@link View#setY(float)} and {@link View#getY()} methods. 16404 */ 16405 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16406 @Override 16407 public void setValue(View object, float value) { 16408 object.setY(value); 16409 } 16410 16411 @Override 16412 public Float get(View object) { 16413 return object.getY(); 16414 } 16415 }; 16416 16417 /** 16418 * A Property wrapper around the <code>rotation</code> functionality handled by the 16419 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16420 */ 16421 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16422 @Override 16423 public void setValue(View object, float value) { 16424 object.setRotation(value); 16425 } 16426 16427 @Override 16428 public Float get(View object) { 16429 return object.getRotation(); 16430 } 16431 }; 16432 16433 /** 16434 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16435 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16436 */ 16437 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16438 @Override 16439 public void setValue(View object, float value) { 16440 object.setRotationX(value); 16441 } 16442 16443 @Override 16444 public Float get(View object) { 16445 return object.getRotationX(); 16446 } 16447 }; 16448 16449 /** 16450 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16451 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16452 */ 16453 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16454 @Override 16455 public void setValue(View object, float value) { 16456 object.setRotationY(value); 16457 } 16458 16459 @Override 16460 public Float get(View object) { 16461 return object.getRotationY(); 16462 } 16463 }; 16464 16465 /** 16466 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16467 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16468 */ 16469 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16470 @Override 16471 public void setValue(View object, float value) { 16472 object.setScaleX(value); 16473 } 16474 16475 @Override 16476 public Float get(View object) { 16477 return object.getScaleX(); 16478 } 16479 }; 16480 16481 /** 16482 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16483 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16484 */ 16485 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16486 @Override 16487 public void setValue(View object, float value) { 16488 object.setScaleY(value); 16489 } 16490 16491 @Override 16492 public Float get(View object) { 16493 return object.getScaleY(); 16494 } 16495 }; 16496 16497 /** 16498 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16499 * Each MeasureSpec represents a requirement for either the width or the height. 16500 * A MeasureSpec is comprised of a size and a mode. There are three possible 16501 * modes: 16502 * <dl> 16503 * <dt>UNSPECIFIED</dt> 16504 * <dd> 16505 * The parent has not imposed any constraint on the child. It can be whatever size 16506 * it wants. 16507 * </dd> 16508 * 16509 * <dt>EXACTLY</dt> 16510 * <dd> 16511 * The parent has determined an exact size for the child. The child is going to be 16512 * given those bounds regardless of how big it wants to be. 16513 * </dd> 16514 * 16515 * <dt>AT_MOST</dt> 16516 * <dd> 16517 * The child can be as large as it wants up to the specified size. 16518 * </dd> 16519 * </dl> 16520 * 16521 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16522 * is provided to pack and unpack the <size, mode> tuple into the int. 16523 */ 16524 public static class MeasureSpec { 16525 private static final int MODE_SHIFT = 30; 16526 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16527 16528 /** 16529 * Measure specification mode: The parent has not imposed any constraint 16530 * on the child. It can be whatever size it wants. 16531 */ 16532 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16533 16534 /** 16535 * Measure specification mode: The parent has determined an exact size 16536 * for the child. The child is going to be given those bounds regardless 16537 * of how big it wants to be. 16538 */ 16539 public static final int EXACTLY = 1 << MODE_SHIFT; 16540 16541 /** 16542 * Measure specification mode: The child can be as large as it wants up 16543 * to the specified size. 16544 */ 16545 public static final int AT_MOST = 2 << MODE_SHIFT; 16546 16547 /** 16548 * Creates a measure specification based on the supplied size and mode. 16549 * 16550 * The mode must always be one of the following: 16551 * <ul> 16552 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16553 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16554 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16555 * </ul> 16556 * 16557 * @param size the size of the measure specification 16558 * @param mode the mode of the measure specification 16559 * @return the measure specification based on size and mode 16560 */ 16561 public static int makeMeasureSpec(int size, int mode) { 16562 return size + mode; 16563 } 16564 16565 /** 16566 * Extracts the mode from the supplied measure specification. 16567 * 16568 * @param measureSpec the measure specification to extract the mode from 16569 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16570 * {@link android.view.View.MeasureSpec#AT_MOST} or 16571 * {@link android.view.View.MeasureSpec#EXACTLY} 16572 */ 16573 public static int getMode(int measureSpec) { 16574 return (measureSpec & MODE_MASK); 16575 } 16576 16577 /** 16578 * Extracts the size from the supplied measure specification. 16579 * 16580 * @param measureSpec the measure specification to extract the size from 16581 * @return the size in pixels defined in the supplied measure specification 16582 */ 16583 public static int getSize(int measureSpec) { 16584 return (measureSpec & ~MODE_MASK); 16585 } 16586 16587 /** 16588 * Returns a String representation of the specified measure 16589 * specification. 16590 * 16591 * @param measureSpec the measure specification to convert to a String 16592 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16593 */ 16594 public static String toString(int measureSpec) { 16595 int mode = getMode(measureSpec); 16596 int size = getSize(measureSpec); 16597 16598 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16599 16600 if (mode == UNSPECIFIED) 16601 sb.append("UNSPECIFIED "); 16602 else if (mode == EXACTLY) 16603 sb.append("EXACTLY "); 16604 else if (mode == AT_MOST) 16605 sb.append("AT_MOST "); 16606 else 16607 sb.append(mode).append(" "); 16608 16609 sb.append(size); 16610 return sb.toString(); 16611 } 16612 } 16613 16614 class CheckForLongPress implements Runnable { 16615 16616 private int mOriginalWindowAttachCount; 16617 16618 public void run() { 16619 if (isPressed() && (mParent != null) 16620 && mOriginalWindowAttachCount == mWindowAttachCount) { 16621 if (performLongClick()) { 16622 mHasPerformedLongPress = true; 16623 } 16624 } 16625 } 16626 16627 public void rememberWindowAttachCount() { 16628 mOriginalWindowAttachCount = mWindowAttachCount; 16629 } 16630 } 16631 16632 private final class CheckForTap implements Runnable { 16633 public void run() { 16634 mPrivateFlags &= ~PREPRESSED; 16635 setPressed(true); 16636 checkForLongClick(ViewConfiguration.getTapTimeout()); 16637 } 16638 } 16639 16640 private final class PerformClick implements Runnable { 16641 public void run() { 16642 performClick(); 16643 } 16644 } 16645 16646 /** @hide */ 16647 public void hackTurnOffWindowResizeAnim(boolean off) { 16648 mAttachInfo.mTurnOffWindowResizeAnim = off; 16649 } 16650 16651 /** 16652 * This method returns a ViewPropertyAnimator object, which can be used to animate 16653 * specific properties on this View. 16654 * 16655 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16656 */ 16657 public ViewPropertyAnimator animate() { 16658 if (mAnimator == null) { 16659 mAnimator = new ViewPropertyAnimator(this); 16660 } 16661 return mAnimator; 16662 } 16663 16664 /** 16665 * Interface definition for a callback to be invoked when a key event is 16666 * dispatched to this view. The callback will be invoked before the key 16667 * event is given to the view. 16668 */ 16669 public interface OnKeyListener { 16670 /** 16671 * Called when a key is dispatched to a view. This allows listeners to 16672 * get a chance to respond before the target view. 16673 * 16674 * @param v The view the key has been dispatched to. 16675 * @param keyCode The code for the physical key that was pressed 16676 * @param event The KeyEvent object containing full information about 16677 * the event. 16678 * @return True if the listener has consumed the event, false otherwise. 16679 */ 16680 boolean onKey(View v, int keyCode, KeyEvent event); 16681 } 16682 16683 /** 16684 * Interface definition for a callback to be invoked when a touch event is 16685 * dispatched to this view. The callback will be invoked before the touch 16686 * event is given to the view. 16687 */ 16688 public interface OnTouchListener { 16689 /** 16690 * Called when a touch event is dispatched to a view. This allows listeners to 16691 * get a chance to respond before the target view. 16692 * 16693 * @param v The view the touch event has been dispatched to. 16694 * @param event The MotionEvent object containing full information about 16695 * the event. 16696 * @return True if the listener has consumed the event, false otherwise. 16697 */ 16698 boolean onTouch(View v, MotionEvent event); 16699 } 16700 16701 /** 16702 * Interface definition for a callback to be invoked when a hover event is 16703 * dispatched to this view. The callback will be invoked before the hover 16704 * event is given to the view. 16705 */ 16706 public interface OnHoverListener { 16707 /** 16708 * Called when a hover event is dispatched to a view. This allows listeners to 16709 * get a chance to respond before the target view. 16710 * 16711 * @param v The view the hover event has been dispatched to. 16712 * @param event The MotionEvent object containing full information about 16713 * the event. 16714 * @return True if the listener has consumed the event, false otherwise. 16715 */ 16716 boolean onHover(View v, MotionEvent event); 16717 } 16718 16719 /** 16720 * Interface definition for a callback to be invoked when a generic motion event is 16721 * dispatched to this view. The callback will be invoked before the generic motion 16722 * event is given to the view. 16723 */ 16724 public interface OnGenericMotionListener { 16725 /** 16726 * Called when a generic motion event is dispatched to a view. This allows listeners to 16727 * get a chance to respond before the target view. 16728 * 16729 * @param v The view the generic motion event has been dispatched to. 16730 * @param event The MotionEvent object containing full information about 16731 * the event. 16732 * @return True if the listener has consumed the event, false otherwise. 16733 */ 16734 boolean onGenericMotion(View v, MotionEvent event); 16735 } 16736 16737 /** 16738 * Interface definition for a callback to be invoked when a view has been clicked and held. 16739 */ 16740 public interface OnLongClickListener { 16741 /** 16742 * Called when a view has been clicked and held. 16743 * 16744 * @param v The view that was clicked and held. 16745 * 16746 * @return true if the callback consumed the long click, false otherwise. 16747 */ 16748 boolean onLongClick(View v); 16749 } 16750 16751 /** 16752 * Interface definition for a callback to be invoked when a drag is being dispatched 16753 * to this view. The callback will be invoked before the hosting view's own 16754 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16755 * onDrag(event) behavior, it should return 'false' from this callback. 16756 * 16757 * <div class="special reference"> 16758 * <h3>Developer Guides</h3> 16759 * <p>For a guide to implementing drag and drop features, read the 16760 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16761 * </div> 16762 */ 16763 public interface OnDragListener { 16764 /** 16765 * Called when a drag event is dispatched to a view. This allows listeners 16766 * to get a chance to override base View behavior. 16767 * 16768 * @param v The View that received the drag event. 16769 * @param event The {@link android.view.DragEvent} object for the drag event. 16770 * @return {@code true} if the drag event was handled successfully, or {@code false} 16771 * if the drag event was not handled. Note that {@code false} will trigger the View 16772 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16773 */ 16774 boolean onDrag(View v, DragEvent event); 16775 } 16776 16777 /** 16778 * Interface definition for a callback to be invoked when the focus state of 16779 * a view changed. 16780 */ 16781 public interface OnFocusChangeListener { 16782 /** 16783 * Called when the focus state of a view has changed. 16784 * 16785 * @param v The view whose state has changed. 16786 * @param hasFocus The new focus state of v. 16787 */ 16788 void onFocusChange(View v, boolean hasFocus); 16789 } 16790 16791 /** 16792 * Interface definition for a callback to be invoked when a view is clicked. 16793 */ 16794 public interface OnClickListener { 16795 /** 16796 * Called when a view has been clicked. 16797 * 16798 * @param v The view that was clicked. 16799 */ 16800 void onClick(View v); 16801 } 16802 16803 /** 16804 * Interface definition for a callback to be invoked when the context menu 16805 * for this view is being built. 16806 */ 16807 public interface OnCreateContextMenuListener { 16808 /** 16809 * Called when the context menu for this view is being built. It is not 16810 * safe to hold onto the menu after this method returns. 16811 * 16812 * @param menu The context menu that is being built 16813 * @param v The view for which the context menu is being built 16814 * @param menuInfo Extra information about the item for which the 16815 * context menu should be shown. This information will vary 16816 * depending on the class of v. 16817 */ 16818 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16819 } 16820 16821 /** 16822 * Interface definition for a callback to be invoked when the status bar changes 16823 * visibility. This reports <strong>global</strong> changes to the system UI 16824 * state, not just what the application is requesting. 16825 * 16826 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16827 */ 16828 public interface OnSystemUiVisibilityChangeListener { 16829 /** 16830 * Called when the status bar changes visibility because of a call to 16831 * {@link View#setSystemUiVisibility(int)}. 16832 * 16833 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 16834 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 16835 * <strong>global</strong> state of the UI visibility flags, not what your 16836 * app is currently applying. 16837 */ 16838 public void onSystemUiVisibilityChange(int visibility); 16839 } 16840 16841 /** 16842 * Interface definition for a callback to be invoked when this view is attached 16843 * or detached from its window. 16844 */ 16845 public interface OnAttachStateChangeListener { 16846 /** 16847 * Called when the view is attached to a window. 16848 * @param v The view that was attached 16849 */ 16850 public void onViewAttachedToWindow(View v); 16851 /** 16852 * Called when the view is detached from a window. 16853 * @param v The view that was detached 16854 */ 16855 public void onViewDetachedFromWindow(View v); 16856 } 16857 16858 private final class UnsetPressedState implements Runnable { 16859 public void run() { 16860 setPressed(false); 16861 } 16862 } 16863 16864 /** 16865 * Base class for derived classes that want to save and restore their own 16866 * state in {@link android.view.View#onSaveInstanceState()}. 16867 */ 16868 public static class BaseSavedState extends AbsSavedState { 16869 /** 16870 * Constructor used when reading from a parcel. Reads the state of the superclass. 16871 * 16872 * @param source 16873 */ 16874 public BaseSavedState(Parcel source) { 16875 super(source); 16876 } 16877 16878 /** 16879 * Constructor called by derived classes when creating their SavedState objects 16880 * 16881 * @param superState The state of the superclass of this view 16882 */ 16883 public BaseSavedState(Parcelable superState) { 16884 super(superState); 16885 } 16886 16887 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16888 new Parcelable.Creator<BaseSavedState>() { 16889 public BaseSavedState createFromParcel(Parcel in) { 16890 return new BaseSavedState(in); 16891 } 16892 16893 public BaseSavedState[] newArray(int size) { 16894 return new BaseSavedState[size]; 16895 } 16896 }; 16897 } 16898 16899 /** 16900 * A set of information given to a view when it is attached to its parent 16901 * window. 16902 */ 16903 static class AttachInfo { 16904 interface Callbacks { 16905 void playSoundEffect(int effectId); 16906 boolean performHapticFeedback(int effectId, boolean always); 16907 } 16908 16909 /** 16910 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 16911 * to a Handler. This class contains the target (View) to invalidate and 16912 * the coordinates of the dirty rectangle. 16913 * 16914 * For performance purposes, this class also implements a pool of up to 16915 * POOL_LIMIT objects that get reused. This reduces memory allocations 16916 * whenever possible. 16917 */ 16918 static class InvalidateInfo implements Poolable<InvalidateInfo> { 16919 private static final int POOL_LIMIT = 10; 16920 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 16921 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 16922 public InvalidateInfo newInstance() { 16923 return new InvalidateInfo(); 16924 } 16925 16926 public void onAcquired(InvalidateInfo element) { 16927 } 16928 16929 public void onReleased(InvalidateInfo element) { 16930 element.target = null; 16931 } 16932 }, POOL_LIMIT) 16933 ); 16934 16935 private InvalidateInfo mNext; 16936 private boolean mIsPooled; 16937 16938 View target; 16939 16940 int left; 16941 int top; 16942 int right; 16943 int bottom; 16944 16945 public void setNextPoolable(InvalidateInfo element) { 16946 mNext = element; 16947 } 16948 16949 public InvalidateInfo getNextPoolable() { 16950 return mNext; 16951 } 16952 16953 static InvalidateInfo acquire() { 16954 return sPool.acquire(); 16955 } 16956 16957 void release() { 16958 sPool.release(this); 16959 } 16960 16961 public boolean isPooled() { 16962 return mIsPooled; 16963 } 16964 16965 public void setPooled(boolean isPooled) { 16966 mIsPooled = isPooled; 16967 } 16968 } 16969 16970 final IWindowSession mSession; 16971 16972 final IWindow mWindow; 16973 16974 final IBinder mWindowToken; 16975 16976 final Callbacks mRootCallbacks; 16977 16978 HardwareCanvas mHardwareCanvas; 16979 16980 /** 16981 * The top view of the hierarchy. 16982 */ 16983 View mRootView; 16984 16985 IBinder mPanelParentWindowToken; 16986 Surface mSurface; 16987 16988 boolean mHardwareAccelerated; 16989 boolean mHardwareAccelerationRequested; 16990 HardwareRenderer mHardwareRenderer; 16991 16992 boolean mScreenOn; 16993 16994 /** 16995 * Scale factor used by the compatibility mode 16996 */ 16997 float mApplicationScale; 16998 16999 /** 17000 * Indicates whether the application is in compatibility mode 17001 */ 17002 boolean mScalingRequired; 17003 17004 /** 17005 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17006 */ 17007 boolean mTurnOffWindowResizeAnim; 17008 17009 /** 17010 * Left position of this view's window 17011 */ 17012 int mWindowLeft; 17013 17014 /** 17015 * Top position of this view's window 17016 */ 17017 int mWindowTop; 17018 17019 /** 17020 * Indicates whether views need to use 32-bit drawing caches 17021 */ 17022 boolean mUse32BitDrawingCache; 17023 17024 /** 17025 * Describes the parts of the window that are currently completely 17026 * obscured by system UI elements. 17027 */ 17028 final Rect mSystemInsets = new Rect(); 17029 17030 /** 17031 * For windows that are full-screen but using insets to layout inside 17032 * of the screen decorations, these are the current insets for the 17033 * content of the window. 17034 */ 17035 final Rect mContentInsets = new Rect(); 17036 17037 /** 17038 * For windows that are full-screen but using insets to layout inside 17039 * of the screen decorations, these are the current insets for the 17040 * actual visible parts of the window. 17041 */ 17042 final Rect mVisibleInsets = new Rect(); 17043 17044 /** 17045 * The internal insets given by this window. This value is 17046 * supplied by the client (through 17047 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17048 * be given to the window manager when changed to be used in laying 17049 * out windows behind it. 17050 */ 17051 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17052 = new ViewTreeObserver.InternalInsetsInfo(); 17053 17054 /** 17055 * All views in the window's hierarchy that serve as scroll containers, 17056 * used to determine if the window can be resized or must be panned 17057 * to adjust for a soft input area. 17058 */ 17059 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17060 17061 final KeyEvent.DispatcherState mKeyDispatchState 17062 = new KeyEvent.DispatcherState(); 17063 17064 /** 17065 * Indicates whether the view's window currently has the focus. 17066 */ 17067 boolean mHasWindowFocus; 17068 17069 /** 17070 * The current visibility of the window. 17071 */ 17072 int mWindowVisibility; 17073 17074 /** 17075 * Indicates the time at which drawing started to occur. 17076 */ 17077 long mDrawingTime; 17078 17079 /** 17080 * Indicates whether or not ignoring the DIRTY_MASK flags. 17081 */ 17082 boolean mIgnoreDirtyState; 17083 17084 /** 17085 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17086 * to avoid clearing that flag prematurely. 17087 */ 17088 boolean mSetIgnoreDirtyState = false; 17089 17090 /** 17091 * Indicates whether the view's window is currently in touch mode. 17092 */ 17093 boolean mInTouchMode; 17094 17095 /** 17096 * Indicates that ViewAncestor should trigger a global layout change 17097 * the next time it performs a traversal 17098 */ 17099 boolean mRecomputeGlobalAttributes; 17100 17101 /** 17102 * Always report new attributes at next traversal. 17103 */ 17104 boolean mForceReportNewAttributes; 17105 17106 /** 17107 * Set during a traveral if any views want to keep the screen on. 17108 */ 17109 boolean mKeepScreenOn; 17110 17111 /** 17112 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17113 */ 17114 int mSystemUiVisibility; 17115 17116 /** 17117 * Hack to force certain system UI visibility flags to be cleared. 17118 */ 17119 int mDisabledSystemUiVisibility; 17120 17121 /** 17122 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17123 * attached. 17124 */ 17125 boolean mHasSystemUiListeners; 17126 17127 /** 17128 * Set if the visibility of any views has changed. 17129 */ 17130 boolean mViewVisibilityChanged; 17131 17132 /** 17133 * Set to true if a view has been scrolled. 17134 */ 17135 boolean mViewScrollChanged; 17136 17137 /** 17138 * Global to the view hierarchy used as a temporary for dealing with 17139 * x/y points in the transparent region computations. 17140 */ 17141 final int[] mTransparentLocation = new int[2]; 17142 17143 /** 17144 * Global to the view hierarchy used as a temporary for dealing with 17145 * x/y points in the ViewGroup.invalidateChild implementation. 17146 */ 17147 final int[] mInvalidateChildLocation = new int[2]; 17148 17149 17150 /** 17151 * Global to the view hierarchy used as a temporary for dealing with 17152 * x/y location when view is transformed. 17153 */ 17154 final float[] mTmpTransformLocation = new float[2]; 17155 17156 /** 17157 * The view tree observer used to dispatch global events like 17158 * layout, pre-draw, touch mode change, etc. 17159 */ 17160 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17161 17162 /** 17163 * A Canvas used by the view hierarchy to perform bitmap caching. 17164 */ 17165 Canvas mCanvas; 17166 17167 /** 17168 * The view root impl. 17169 */ 17170 final ViewRootImpl mViewRootImpl; 17171 17172 /** 17173 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17174 * handler can be used to pump events in the UI events queue. 17175 */ 17176 final Handler mHandler; 17177 17178 /** 17179 * Temporary for use in computing invalidate rectangles while 17180 * calling up the hierarchy. 17181 */ 17182 final Rect mTmpInvalRect = new Rect(); 17183 17184 /** 17185 * Temporary for use in computing hit areas with transformed views 17186 */ 17187 final RectF mTmpTransformRect = new RectF(); 17188 17189 /** 17190 * Temporary list for use in collecting focusable descendents of a view. 17191 */ 17192 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17193 17194 /** 17195 * The id of the window for accessibility purposes. 17196 */ 17197 int mAccessibilityWindowId = View.NO_ID; 17198 17199 /** 17200 * Whether to ingore not exposed for accessibility Views when 17201 * reporting the view tree to accessibility services. 17202 */ 17203 boolean mIncludeNotImportantViews; 17204 17205 /** 17206 * The drawable for highlighting accessibility focus. 17207 */ 17208 Drawable mAccessibilityFocusDrawable; 17209 17210 /** 17211 * Show where the margins, bounds and layout bounds are for each view. 17212 */ 17213 final boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17214 17215 /** 17216 * Point used to compute visible regions. 17217 */ 17218 final Point mPoint = new Point(); 17219 17220 /** 17221 * Creates a new set of attachment information with the specified 17222 * events handler and thread. 17223 * 17224 * @param handler the events handler the view must use 17225 */ 17226 AttachInfo(IWindowSession session, IWindow window, 17227 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17228 mSession = session; 17229 mWindow = window; 17230 mWindowToken = window.asBinder(); 17231 mViewRootImpl = viewRootImpl; 17232 mHandler = handler; 17233 mRootCallbacks = effectPlayer; 17234 } 17235 } 17236 17237 /** 17238 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17239 * is supported. This avoids keeping too many unused fields in most 17240 * instances of View.</p> 17241 */ 17242 private static class ScrollabilityCache implements Runnable { 17243 17244 /** 17245 * Scrollbars are not visible 17246 */ 17247 public static final int OFF = 0; 17248 17249 /** 17250 * Scrollbars are visible 17251 */ 17252 public static final int ON = 1; 17253 17254 /** 17255 * Scrollbars are fading away 17256 */ 17257 public static final int FADING = 2; 17258 17259 public boolean fadeScrollBars; 17260 17261 public int fadingEdgeLength; 17262 public int scrollBarDefaultDelayBeforeFade; 17263 public int scrollBarFadeDuration; 17264 17265 public int scrollBarSize; 17266 public ScrollBarDrawable scrollBar; 17267 public float[] interpolatorValues; 17268 public View host; 17269 17270 public final Paint paint; 17271 public final Matrix matrix; 17272 public Shader shader; 17273 17274 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17275 17276 private static final float[] OPAQUE = { 255 }; 17277 private static final float[] TRANSPARENT = { 0.0f }; 17278 17279 /** 17280 * When fading should start. This time moves into the future every time 17281 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17282 */ 17283 public long fadeStartTime; 17284 17285 17286 /** 17287 * The current state of the scrollbars: ON, OFF, or FADING 17288 */ 17289 public int state = OFF; 17290 17291 private int mLastColor; 17292 17293 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17294 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17295 scrollBarSize = configuration.getScaledScrollBarSize(); 17296 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17297 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17298 17299 paint = new Paint(); 17300 matrix = new Matrix(); 17301 // use use a height of 1, and then wack the matrix each time we 17302 // actually use it. 17303 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17304 17305 paint.setShader(shader); 17306 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17307 this.host = host; 17308 } 17309 17310 public void setFadeColor(int color) { 17311 if (color != 0 && color != mLastColor) { 17312 mLastColor = color; 17313 color |= 0xFF000000; 17314 17315 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17316 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17317 17318 paint.setShader(shader); 17319 // Restore the default transfer mode (src_over) 17320 paint.setXfermode(null); 17321 } 17322 } 17323 17324 public void run() { 17325 long now = AnimationUtils.currentAnimationTimeMillis(); 17326 if (now >= fadeStartTime) { 17327 17328 // the animation fades the scrollbars out by changing 17329 // the opacity (alpha) from fully opaque to fully 17330 // transparent 17331 int nextFrame = (int) now; 17332 int framesCount = 0; 17333 17334 Interpolator interpolator = scrollBarInterpolator; 17335 17336 // Start opaque 17337 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17338 17339 // End transparent 17340 nextFrame += scrollBarFadeDuration; 17341 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17342 17343 state = FADING; 17344 17345 // Kick off the fade animation 17346 host.invalidate(true); 17347 } 17348 } 17349 } 17350 17351 /** 17352 * Resuable callback for sending 17353 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17354 */ 17355 private class SendViewScrolledAccessibilityEvent implements Runnable { 17356 public volatile boolean mIsPending; 17357 17358 public void run() { 17359 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17360 mIsPending = false; 17361 } 17362 } 17363 17364 /** 17365 * <p> 17366 * This class represents a delegate that can be registered in a {@link View} 17367 * to enhance accessibility support via composition rather via inheritance. 17368 * It is specifically targeted to widget developers that extend basic View 17369 * classes i.e. classes in package android.view, that would like their 17370 * applications to be backwards compatible. 17371 * </p> 17372 * <div class="special reference"> 17373 * <h3>Developer Guides</h3> 17374 * <p>For more information about making applications accessible, read the 17375 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17376 * developer guide.</p> 17377 * </div> 17378 * <p> 17379 * A scenario in which a developer would like to use an accessibility delegate 17380 * is overriding a method introduced in a later API version then the minimal API 17381 * version supported by the application. For example, the method 17382 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17383 * in API version 4 when the accessibility APIs were first introduced. If a 17384 * developer would like his application to run on API version 4 devices (assuming 17385 * all other APIs used by the application are version 4 or lower) and take advantage 17386 * of this method, instead of overriding the method which would break the application's 17387 * backwards compatibility, he can override the corresponding method in this 17388 * delegate and register the delegate in the target View if the API version of 17389 * the system is high enough i.e. the API version is same or higher to the API 17390 * version that introduced 17391 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17392 * </p> 17393 * <p> 17394 * Here is an example implementation: 17395 * </p> 17396 * <code><pre><p> 17397 * if (Build.VERSION.SDK_INT >= 14) { 17398 * // If the API version is equal of higher than the version in 17399 * // which onInitializeAccessibilityNodeInfo was introduced we 17400 * // register a delegate with a customized implementation. 17401 * View view = findViewById(R.id.view_id); 17402 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17403 * public void onInitializeAccessibilityNodeInfo(View host, 17404 * AccessibilityNodeInfo info) { 17405 * // Let the default implementation populate the info. 17406 * super.onInitializeAccessibilityNodeInfo(host, info); 17407 * // Set some other information. 17408 * info.setEnabled(host.isEnabled()); 17409 * } 17410 * }); 17411 * } 17412 * </code></pre></p> 17413 * <p> 17414 * This delegate contains methods that correspond to the accessibility methods 17415 * in View. If a delegate has been specified the implementation in View hands 17416 * off handling to the corresponding method in this delegate. The default 17417 * implementation the delegate methods behaves exactly as the corresponding 17418 * method in View for the case of no accessibility delegate been set. Hence, 17419 * to customize the behavior of a View method, clients can override only the 17420 * corresponding delegate method without altering the behavior of the rest 17421 * accessibility related methods of the host view. 17422 * </p> 17423 */ 17424 public static class AccessibilityDelegate { 17425 17426 /** 17427 * Sends an accessibility event of the given type. If accessibility is not 17428 * enabled this method has no effect. 17429 * <p> 17430 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17431 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17432 * been set. 17433 * </p> 17434 * 17435 * @param host The View hosting the delegate. 17436 * @param eventType The type of the event to send. 17437 * 17438 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17439 */ 17440 public void sendAccessibilityEvent(View host, int eventType) { 17441 host.sendAccessibilityEventInternal(eventType); 17442 } 17443 17444 /** 17445 * Performs the specified accessibility action on the view. For 17446 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17447 * <p> 17448 * The default implementation behaves as 17449 * {@link View#performAccessibilityAction(int, Bundle) 17450 * View#performAccessibilityAction(int, Bundle)} for the case of 17451 * no accessibility delegate been set. 17452 * </p> 17453 * 17454 * @param action The action to perform. 17455 * @return Whether the action was performed. 17456 * 17457 * @see View#performAccessibilityAction(int, Bundle) 17458 * View#performAccessibilityAction(int, Bundle) 17459 */ 17460 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17461 return host.performAccessibilityActionInternal(action, args); 17462 } 17463 17464 /** 17465 * Sends an accessibility event. This method behaves exactly as 17466 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17467 * empty {@link AccessibilityEvent} and does not perform a check whether 17468 * accessibility is enabled. 17469 * <p> 17470 * The default implementation behaves as 17471 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17472 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17473 * the case of no accessibility delegate been set. 17474 * </p> 17475 * 17476 * @param host The View hosting the delegate. 17477 * @param event The event to send. 17478 * 17479 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17480 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17481 */ 17482 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17483 host.sendAccessibilityEventUncheckedInternal(event); 17484 } 17485 17486 /** 17487 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17488 * to its children for adding their text content to the event. 17489 * <p> 17490 * The default implementation behaves as 17491 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17492 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17493 * the case of no accessibility delegate been set. 17494 * </p> 17495 * 17496 * @param host The View hosting the delegate. 17497 * @param event The event. 17498 * @return True if the event population was completed. 17499 * 17500 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17501 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17502 */ 17503 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17504 return host.dispatchPopulateAccessibilityEventInternal(event); 17505 } 17506 17507 /** 17508 * Gives a chance to the host View to populate the accessibility event with its 17509 * text content. 17510 * <p> 17511 * The default implementation behaves as 17512 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17513 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17514 * the case of no accessibility delegate been set. 17515 * </p> 17516 * 17517 * @param host The View hosting the delegate. 17518 * @param event The accessibility event which to populate. 17519 * 17520 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17521 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17522 */ 17523 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17524 host.onPopulateAccessibilityEventInternal(event); 17525 } 17526 17527 /** 17528 * Initializes an {@link AccessibilityEvent} with information about the 17529 * the host View which is the event source. 17530 * <p> 17531 * The default implementation behaves as 17532 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17533 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17534 * the case of no accessibility delegate been set. 17535 * </p> 17536 * 17537 * @param host The View hosting the delegate. 17538 * @param event The event to initialize. 17539 * 17540 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17541 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17542 */ 17543 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17544 host.onInitializeAccessibilityEventInternal(event); 17545 } 17546 17547 /** 17548 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17549 * <p> 17550 * The default implementation behaves as 17551 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17552 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17553 * the case of no accessibility delegate been set. 17554 * </p> 17555 * 17556 * @param host The View hosting the delegate. 17557 * @param info The instance to initialize. 17558 * 17559 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17560 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17561 */ 17562 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17563 host.onInitializeAccessibilityNodeInfoInternal(info); 17564 } 17565 17566 /** 17567 * Called when a child of the host View has requested sending an 17568 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17569 * to augment the event. 17570 * <p> 17571 * The default implementation behaves as 17572 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17573 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17574 * the case of no accessibility delegate been set. 17575 * </p> 17576 * 17577 * @param host The View hosting the delegate. 17578 * @param child The child which requests sending the event. 17579 * @param event The event to be sent. 17580 * @return True if the event should be sent 17581 * 17582 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17583 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17584 */ 17585 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17586 AccessibilityEvent event) { 17587 return host.onRequestSendAccessibilityEventInternal(child, event); 17588 } 17589 17590 /** 17591 * Gets the provider for managing a virtual view hierarchy rooted at this View 17592 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17593 * that explore the window content. 17594 * <p> 17595 * The default implementation behaves as 17596 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17597 * the case of no accessibility delegate been set. 17598 * </p> 17599 * 17600 * @return The provider. 17601 * 17602 * @see AccessibilityNodeProvider 17603 */ 17604 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17605 return null; 17606 } 17607 } 17608} 17609