View.java revision e54c5f13652166c5896ccfa55f047301a6c8b876
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93 94/** 95 * <p> 96 * This class represents the basic building block for user interface components. A View 97 * occupies a rectangular area on the screen and is responsible for drawing and 98 * event handling. View is the base class for <em>widgets</em>, which are 99 * used to create interactive UI components (buttons, text fields, etc.). The 100 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 101 * are invisible containers that hold other Views (or other ViewGroups) and define 102 * their layout properties. 103 * </p> 104 * 105 * <div class="special reference"> 106 * <h3>Developer Guides</h3> 107 * <p>For information about using this class to develop your application's user interface, 108 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, {@link #getPaddingRight()}, 348 * {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Properties"></a> 543 * <h3>Properties</h3> 544 * <p> 545 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 546 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 547 * available both in the {@link Property} form as well as in similarly-named setter/getter 548 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 549 * be used to set persistent state associated with these rendering-related properties on the view. 550 * The properties and methods can also be used in conjunction with 551 * {@link android.animation.Animator Animator}-based animations, described more in the 552 * <a href="#Animation">Animation</a> section. 553 * </p> 554 * 555 * <a name="Animation"></a> 556 * <h3>Animation</h3> 557 * <p> 558 * Starting with Android 3.0, the preferred way of animating views is to use the 559 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 560 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 561 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 562 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 563 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 564 * makes animating these View properties particularly easy and efficient. 565 * </p> 566 * <p> 567 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 568 * You can attach an {@link Animation} object to a view using 569 * {@link #setAnimation(Animation)} or 570 * {@link #startAnimation(Animation)}. The animation can alter the scale, 571 * rotation, translation and alpha of a view over time. If the animation is 572 * attached to a view that has children, the animation will affect the entire 573 * subtree rooted by that node. When an animation is started, the framework will 574 * take care of redrawing the appropriate views until the animation completes. 575 * </p> 576 * 577 * <a name="Security"></a> 578 * <h3>Security</h3> 579 * <p> 580 * Sometimes it is essential that an application be able to verify that an action 581 * is being performed with the full knowledge and consent of the user, such as 582 * granting a permission request, making a purchase or clicking on an advertisement. 583 * Unfortunately, a malicious application could try to spoof the user into 584 * performing these actions, unaware, by concealing the intended purpose of the view. 585 * As a remedy, the framework offers a touch filtering mechanism that can be used to 586 * improve the security of views that provide access to sensitive functionality. 587 * </p><p> 588 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 589 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 590 * will discard touches that are received whenever the view's window is obscured by 591 * another visible window. As a result, the view will not receive touches whenever a 592 * toast, dialog or other window appears above the view's window. 593 * </p><p> 594 * For more fine-grained control over security, consider overriding the 595 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 596 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 597 * </p> 598 * 599 * @attr ref android.R.styleable#View_alpha 600 * @attr ref android.R.styleable#View_background 601 * @attr ref android.R.styleable#View_clickable 602 * @attr ref android.R.styleable#View_contentDescription 603 * @attr ref android.R.styleable#View_drawingCacheQuality 604 * @attr ref android.R.styleable#View_duplicateParentState 605 * @attr ref android.R.styleable#View_id 606 * @attr ref android.R.styleable#View_requiresFadingEdge 607 * @attr ref android.R.styleable#View_fadeScrollbars 608 * @attr ref android.R.styleable#View_fadingEdgeLength 609 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 610 * @attr ref android.R.styleable#View_fitsSystemWindows 611 * @attr ref android.R.styleable#View_isScrollContainer 612 * @attr ref android.R.styleable#View_focusable 613 * @attr ref android.R.styleable#View_focusableInTouchMode 614 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 615 * @attr ref android.R.styleable#View_keepScreenOn 616 * @attr ref android.R.styleable#View_layerType 617 * @attr ref android.R.styleable#View_longClickable 618 * @attr ref android.R.styleable#View_minHeight 619 * @attr ref android.R.styleable#View_minWidth 620 * @attr ref android.R.styleable#View_nextFocusDown 621 * @attr ref android.R.styleable#View_nextFocusLeft 622 * @attr ref android.R.styleable#View_nextFocusRight 623 * @attr ref android.R.styleable#View_nextFocusUp 624 * @attr ref android.R.styleable#View_onClick 625 * @attr ref android.R.styleable#View_padding 626 * @attr ref android.R.styleable#View_paddingBottom 627 * @attr ref android.R.styleable#View_paddingLeft 628 * @attr ref android.R.styleable#View_paddingRight 629 * @attr ref android.R.styleable#View_paddingTop 630 * @attr ref android.R.styleable#View_saveEnabled 631 * @attr ref android.R.styleable#View_rotation 632 * @attr ref android.R.styleable#View_rotationX 633 * @attr ref android.R.styleable#View_rotationY 634 * @attr ref android.R.styleable#View_scaleX 635 * @attr ref android.R.styleable#View_scaleY 636 * @attr ref android.R.styleable#View_scrollX 637 * @attr ref android.R.styleable#View_scrollY 638 * @attr ref android.R.styleable#View_scrollbarSize 639 * @attr ref android.R.styleable#View_scrollbarStyle 640 * @attr ref android.R.styleable#View_scrollbars 641 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 642 * @attr ref android.R.styleable#View_scrollbarFadeDuration 643 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 644 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 645 * @attr ref android.R.styleable#View_scrollbarThumbVertical 646 * @attr ref android.R.styleable#View_scrollbarTrackVertical 647 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 648 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 649 * @attr ref android.R.styleable#View_soundEffectsEnabled 650 * @attr ref android.R.styleable#View_tag 651 * @attr ref android.R.styleable#View_transformPivotX 652 * @attr ref android.R.styleable#View_transformPivotY 653 * @attr ref android.R.styleable#View_translationX 654 * @attr ref android.R.styleable#View_translationY 655 * @attr ref android.R.styleable#View_visibility 656 * 657 * @see android.view.ViewGroup 658 */ 659public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 660 AccessibilityEventSource { 661 private static final boolean DBG = false; 662 663 /** 664 * The logging tag used by this class with android.util.Log. 665 */ 666 protected static final String VIEW_LOG_TAG = "View"; 667 668 /** 669 * When set to true, apps will draw debugging information about their layouts. 670 * 671 * @hide 672 */ 673 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 674 675 /** 676 * Used to mark a View that has no ID. 677 */ 678 public static final int NO_ID = -1; 679 680 /** 681 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 682 * calling setFlags. 683 */ 684 private static final int NOT_FOCUSABLE = 0x00000000; 685 686 /** 687 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 688 * setFlags. 689 */ 690 private static final int FOCUSABLE = 0x00000001; 691 692 /** 693 * Mask for use with setFlags indicating bits used for focus. 694 */ 695 private static final int FOCUSABLE_MASK = 0x00000001; 696 697 /** 698 * This view will adjust its padding to fit sytem windows (e.g. status bar) 699 */ 700 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 701 702 /** 703 * This view is visible. 704 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 705 * android:visibility}. 706 */ 707 public static final int VISIBLE = 0x00000000; 708 709 /** 710 * This view is invisible, but it still takes up space for layout purposes. 711 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 712 * android:visibility}. 713 */ 714 public static final int INVISIBLE = 0x00000004; 715 716 /** 717 * This view is invisible, and it doesn't take any space for layout 718 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int GONE = 0x00000008; 722 723 /** 724 * Mask for use with setFlags indicating bits used for visibility. 725 * {@hide} 726 */ 727 static final int VISIBILITY_MASK = 0x0000000C; 728 729 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 730 731 /** 732 * This view is enabled. Interpretation varies by subclass. 733 * Use with ENABLED_MASK when calling setFlags. 734 * {@hide} 735 */ 736 static final int ENABLED = 0x00000000; 737 738 /** 739 * This view is disabled. Interpretation varies by subclass. 740 * Use with ENABLED_MASK when calling setFlags. 741 * {@hide} 742 */ 743 static final int DISABLED = 0x00000020; 744 745 /** 746 * Mask for use with setFlags indicating bits used for indicating whether 747 * this view is enabled 748 * {@hide} 749 */ 750 static final int ENABLED_MASK = 0x00000020; 751 752 /** 753 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 754 * called and further optimizations will be performed. It is okay to have 755 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 756 * {@hide} 757 */ 758 static final int WILL_NOT_DRAW = 0x00000080; 759 760 /** 761 * Mask for use with setFlags indicating bits used for indicating whether 762 * this view is will draw 763 * {@hide} 764 */ 765 static final int DRAW_MASK = 0x00000080; 766 767 /** 768 * <p>This view doesn't show scrollbars.</p> 769 * {@hide} 770 */ 771 static final int SCROLLBARS_NONE = 0x00000000; 772 773 /** 774 * <p>This view shows horizontal scrollbars.</p> 775 * {@hide} 776 */ 777 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 778 779 /** 780 * <p>This view shows vertical scrollbars.</p> 781 * {@hide} 782 */ 783 static final int SCROLLBARS_VERTICAL = 0x00000200; 784 785 /** 786 * <p>Mask for use with setFlags indicating bits used for indicating which 787 * scrollbars are enabled.</p> 788 * {@hide} 789 */ 790 static final int SCROLLBARS_MASK = 0x00000300; 791 792 /** 793 * Indicates that the view should filter touches when its window is obscured. 794 * Refer to the class comments for more information about this security feature. 795 * {@hide} 796 */ 797 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 798 799 /** 800 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 801 * that they are optional and should be skipped if the window has 802 * requested system UI flags that ignore those insets for layout. 803 */ 804 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 805 806 /** 807 * <p>This view doesn't show fading edges.</p> 808 * {@hide} 809 */ 810 static final int FADING_EDGE_NONE = 0x00000000; 811 812 /** 813 * <p>This view shows horizontal fading edges.</p> 814 * {@hide} 815 */ 816 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 817 818 /** 819 * <p>This view shows vertical fading edges.</p> 820 * {@hide} 821 */ 822 static final int FADING_EDGE_VERTICAL = 0x00002000; 823 824 /** 825 * <p>Mask for use with setFlags indicating bits used for indicating which 826 * fading edges are enabled.</p> 827 * {@hide} 828 */ 829 static final int FADING_EDGE_MASK = 0x00003000; 830 831 /** 832 * <p>Indicates this view can be clicked. When clickable, a View reacts 833 * to clicks by notifying the OnClickListener.<p> 834 * {@hide} 835 */ 836 static final int CLICKABLE = 0x00004000; 837 838 /** 839 * <p>Indicates this view is caching its drawing into a bitmap.</p> 840 * {@hide} 841 */ 842 static final int DRAWING_CACHE_ENABLED = 0x00008000; 843 844 /** 845 * <p>Indicates that no icicle should be saved for this view.<p> 846 * {@hide} 847 */ 848 static final int SAVE_DISABLED = 0x000010000; 849 850 /** 851 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 852 * property.</p> 853 * {@hide} 854 */ 855 static final int SAVE_DISABLED_MASK = 0x000010000; 856 857 /** 858 * <p>Indicates that no drawing cache should ever be created for this view.<p> 859 * {@hide} 860 */ 861 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 862 863 /** 864 * <p>Indicates this view can take / keep focus when int touch mode.</p> 865 * {@hide} 866 */ 867 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 868 869 /** 870 * <p>Enables low quality mode for the drawing cache.</p> 871 */ 872 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 873 874 /** 875 * <p>Enables high quality mode for the drawing cache.</p> 876 */ 877 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 878 879 /** 880 * <p>Enables automatic quality mode for the drawing cache.</p> 881 */ 882 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 883 884 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 885 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 886 }; 887 888 /** 889 * <p>Mask for use with setFlags indicating bits used for the cache 890 * quality property.</p> 891 * {@hide} 892 */ 893 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 894 895 /** 896 * <p> 897 * Indicates this view can be long clicked. When long clickable, a View 898 * reacts to long clicks by notifying the OnLongClickListener or showing a 899 * context menu. 900 * </p> 901 * {@hide} 902 */ 903 static final int LONG_CLICKABLE = 0x00200000; 904 905 /** 906 * <p>Indicates that this view gets its drawable states from its direct parent 907 * and ignores its original internal states.</p> 908 * 909 * @hide 910 */ 911 static final int DUPLICATE_PARENT_STATE = 0x00400000; 912 913 /** 914 * The scrollbar style to display the scrollbars inside the content area, 915 * without increasing the padding. The scrollbars will be overlaid with 916 * translucency on the view's content. 917 */ 918 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 919 920 /** 921 * The scrollbar style to display the scrollbars inside the padded area, 922 * increasing the padding of the view. The scrollbars will not overlap the 923 * content area of the view. 924 */ 925 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 926 927 /** 928 * The scrollbar style to display the scrollbars at the edge of the view, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency. 931 */ 932 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 933 934 /** 935 * The scrollbar style to display the scrollbars at the edge of the view, 936 * increasing the padding of the view. The scrollbars will only overlap the 937 * background, if any. 938 */ 939 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 940 941 /** 942 * Mask to check if the scrollbar style is overlay or inset. 943 * {@hide} 944 */ 945 static final int SCROLLBARS_INSET_MASK = 0x01000000; 946 947 /** 948 * Mask to check if the scrollbar style is inside or outside. 949 * {@hide} 950 */ 951 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 952 953 /** 954 * Mask for scrollbar style. 955 * {@hide} 956 */ 957 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 958 959 /** 960 * View flag indicating that the screen should remain on while the 961 * window containing this view is visible to the user. This effectively 962 * takes care of automatically setting the WindowManager's 963 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 964 */ 965 public static final int KEEP_SCREEN_ON = 0x04000000; 966 967 /** 968 * View flag indicating whether this view should have sound effects enabled 969 * for events such as clicking and touching. 970 */ 971 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 972 973 /** 974 * View flag indicating whether this view should have haptic feedback 975 * enabled for events such as long presses. 976 */ 977 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 978 979 /** 980 * <p>Indicates that the view hierarchy should stop saving state when 981 * it reaches this view. If state saving is initiated immediately at 982 * the view, it will be allowed. 983 * {@hide} 984 */ 985 static final int PARENT_SAVE_DISABLED = 0x20000000; 986 987 /** 988 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 989 * {@hide} 990 */ 991 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 992 993 /** 994 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 995 * should add all focusable Views regardless if they are focusable in touch mode. 996 */ 997 public static final int FOCUSABLES_ALL = 0x00000000; 998 999 /** 1000 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1001 * should add only Views focusable in touch mode. 1002 */ 1003 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1004 1005 /** 1006 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1007 * should add only accessibility focusable Views. 1008 * 1009 * @hide 1010 */ 1011 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1012 1013 /** 1014 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1015 * item. 1016 */ 1017 public static final int FOCUS_BACKWARD = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_FORWARD = 0x00000002; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the left. 1027 */ 1028 public static final int FOCUS_LEFT = 0x00000011; 1029 1030 /** 1031 * Use with {@link #focusSearch(int)}. Move focus up. 1032 */ 1033 public static final int FOCUS_UP = 0x00000021; 1034 1035 /** 1036 * Use with {@link #focusSearch(int)}. Move focus to the right. 1037 */ 1038 public static final int FOCUS_RIGHT = 0x00000042; 1039 1040 /** 1041 * Use with {@link #focusSearch(int)}. Move focus down. 1042 */ 1043 public static final int FOCUS_DOWN = 0x00000082; 1044 1045 // Accessibility focus directions. 1046 1047 /** 1048 * The accessibility focus which is the current user position when 1049 * interacting with the accessibility framework. 1050 */ 1051 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1052 1053 /** 1054 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1055 */ 1056 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1057 1058 /** 1059 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1060 */ 1061 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1062 1063 /** 1064 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1065 */ 1066 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1067 1068 /** 1069 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1070 */ 1071 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1072 1073 /** 1074 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1075 */ 1076 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1077 1078 /** 1079 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1080 */ 1081 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1082 1083 /** 1084 * Bits of {@link #getMeasuredWidthAndState()} and 1085 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1086 */ 1087 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1088 1089 /** 1090 * Bits of {@link #getMeasuredWidthAndState()} and 1091 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1092 */ 1093 public static final int MEASURED_STATE_MASK = 0xff000000; 1094 1095 /** 1096 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1097 * for functions that combine both width and height into a single int, 1098 * such as {@link #getMeasuredState()} and the childState argument of 1099 * {@link #resolveSizeAndState(int, int, int)}. 1100 */ 1101 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1102 1103 /** 1104 * Bit of {@link #getMeasuredWidthAndState()} and 1105 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1106 * is smaller that the space the view would like to have. 1107 */ 1108 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1109 1110 /** 1111 * Base View state sets 1112 */ 1113 // Singles 1114 /** 1115 * Indicates the view has no states set. States are used with 1116 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1117 * view depending on its state. 1118 * 1119 * @see android.graphics.drawable.Drawable 1120 * @see #getDrawableState() 1121 */ 1122 protected static final int[] EMPTY_STATE_SET; 1123 /** 1124 * Indicates the view is enabled. States are used with 1125 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1126 * view depending on its state. 1127 * 1128 * @see android.graphics.drawable.Drawable 1129 * @see #getDrawableState() 1130 */ 1131 protected static final int[] ENABLED_STATE_SET; 1132 /** 1133 * Indicates the view is focused. States are used with 1134 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1135 * view depending on its state. 1136 * 1137 * @see android.graphics.drawable.Drawable 1138 * @see #getDrawableState() 1139 */ 1140 protected static final int[] FOCUSED_STATE_SET; 1141 /** 1142 * Indicates the view is selected. States are used with 1143 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1144 * view depending on its state. 1145 * 1146 * @see android.graphics.drawable.Drawable 1147 * @see #getDrawableState() 1148 */ 1149 protected static final int[] SELECTED_STATE_SET; 1150 /** 1151 * Indicates the view is pressed. States are used with 1152 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1153 * view depending on its state. 1154 * 1155 * @see android.graphics.drawable.Drawable 1156 * @see #getDrawableState() 1157 * @hide 1158 */ 1159 protected static final int[] PRESSED_STATE_SET; 1160 /** 1161 * Indicates the view's window has focus. States are used with 1162 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1163 * view depending on its state. 1164 * 1165 * @see android.graphics.drawable.Drawable 1166 * @see #getDrawableState() 1167 */ 1168 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1169 // Doubles 1170 /** 1171 * Indicates the view is enabled and has the focus. 1172 * 1173 * @see #ENABLED_STATE_SET 1174 * @see #FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1177 /** 1178 * Indicates the view is enabled and selected. 1179 * 1180 * @see #ENABLED_STATE_SET 1181 * @see #SELECTED_STATE_SET 1182 */ 1183 protected static final int[] ENABLED_SELECTED_STATE_SET; 1184 /** 1185 * Indicates the view is enabled and that its window has focus. 1186 * 1187 * @see #ENABLED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is focused and selected. 1193 * 1194 * @see #FOCUSED_STATE_SET 1195 * @see #SELECTED_STATE_SET 1196 */ 1197 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1198 /** 1199 * Indicates the view has the focus and that its window has the focus. 1200 * 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is selected and that its window has the focus. 1207 * 1208 * @see #SELECTED_STATE_SET 1209 * @see #WINDOW_FOCUSED_STATE_SET 1210 */ 1211 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1212 // Triples 1213 /** 1214 * Indicates the view is enabled, focused and selected. 1215 * 1216 * @see #ENABLED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 */ 1220 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1221 /** 1222 * Indicates the view is enabled, focused and its window has the focus. 1223 * 1224 * @see #ENABLED_STATE_SET 1225 * @see #FOCUSED_STATE_SET 1226 * @see #WINDOW_FOCUSED_STATE_SET 1227 */ 1228 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1229 /** 1230 * Indicates the view is enabled, selected and its window has the focus. 1231 * 1232 * @see #ENABLED_STATE_SET 1233 * @see #SELECTED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is focused, selected and its window has the focus. 1239 * 1240 * @see #FOCUSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is enabled, focused, selected and its window 1247 * has the focus. 1248 * 1249 * @see #ENABLED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed and its window has the focus. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #WINDOW_FOCUSED_STATE_SET 1260 */ 1261 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1262 /** 1263 * Indicates the view is pressed and selected. 1264 * 1265 * @see #PRESSED_STATE_SET 1266 * @see #SELECTED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and focused. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #FOCUSED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, focused and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #FOCUSED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, focused and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #SELECTED_STATE_SET 1297 * @see #FOCUSED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, focused, selected and its window has the focus. 1302 * 1303 * @see #PRESSED_STATE_SET 1304 * @see #FOCUSED_STATE_SET 1305 * @see #SELECTED_STATE_SET 1306 * @see #WINDOW_FOCUSED_STATE_SET 1307 */ 1308 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1309 /** 1310 * Indicates the view is pressed and enabled. 1311 * 1312 * @see #PRESSED_STATE_SET 1313 * @see #ENABLED_STATE_SET 1314 */ 1315 protected static final int[] PRESSED_ENABLED_STATE_SET; 1316 /** 1317 * Indicates the view is pressed, enabled and its window has the focus. 1318 * 1319 * @see #PRESSED_STATE_SET 1320 * @see #ENABLED_STATE_SET 1321 * @see #WINDOW_FOCUSED_STATE_SET 1322 */ 1323 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1324 /** 1325 * Indicates the view is pressed, enabled and selected. 1326 * 1327 * @see #PRESSED_STATE_SET 1328 * @see #ENABLED_STATE_SET 1329 * @see #SELECTED_STATE_SET 1330 */ 1331 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1332 /** 1333 * Indicates the view is pressed, enabled, selected and its window has the 1334 * focus. 1335 * 1336 * @see #PRESSED_STATE_SET 1337 * @see #ENABLED_STATE_SET 1338 * @see #SELECTED_STATE_SET 1339 * @see #WINDOW_FOCUSED_STATE_SET 1340 */ 1341 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1342 /** 1343 * Indicates the view is pressed, enabled and focused. 1344 * 1345 * @see #PRESSED_STATE_SET 1346 * @see #ENABLED_STATE_SET 1347 * @see #FOCUSED_STATE_SET 1348 */ 1349 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1350 /** 1351 * Indicates the view is pressed, enabled, focused and its window has the 1352 * focus. 1353 * 1354 * @see #PRESSED_STATE_SET 1355 * @see #ENABLED_STATE_SET 1356 * @see #FOCUSED_STATE_SET 1357 * @see #WINDOW_FOCUSED_STATE_SET 1358 */ 1359 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1360 /** 1361 * Indicates the view is pressed, enabled, focused and selected. 1362 * 1363 * @see #PRESSED_STATE_SET 1364 * @see #ENABLED_STATE_SET 1365 * @see #SELECTED_STATE_SET 1366 * @see #FOCUSED_STATE_SET 1367 */ 1368 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1369 /** 1370 * Indicates the view is pressed, enabled, focused, selected and its window 1371 * has the focus. 1372 * 1373 * @see #PRESSED_STATE_SET 1374 * @see #ENABLED_STATE_SET 1375 * @see #SELECTED_STATE_SET 1376 * @see #FOCUSED_STATE_SET 1377 * @see #WINDOW_FOCUSED_STATE_SET 1378 */ 1379 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1380 1381 /** 1382 * The order here is very important to {@link #getDrawableState()} 1383 */ 1384 private static final int[][] VIEW_STATE_SETS; 1385 1386 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1387 static final int VIEW_STATE_SELECTED = 1 << 1; 1388 static final int VIEW_STATE_FOCUSED = 1 << 2; 1389 static final int VIEW_STATE_ENABLED = 1 << 3; 1390 static final int VIEW_STATE_PRESSED = 1 << 4; 1391 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1392 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1393 static final int VIEW_STATE_HOVERED = 1 << 7; 1394 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1395 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1396 1397 static final int[] VIEW_STATE_IDS = new int[] { 1398 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1399 R.attr.state_selected, VIEW_STATE_SELECTED, 1400 R.attr.state_focused, VIEW_STATE_FOCUSED, 1401 R.attr.state_enabled, VIEW_STATE_ENABLED, 1402 R.attr.state_pressed, VIEW_STATE_PRESSED, 1403 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1404 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1405 R.attr.state_hovered, VIEW_STATE_HOVERED, 1406 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1407 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1408 }; 1409 1410 static { 1411 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1412 throw new IllegalStateException( 1413 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1414 } 1415 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1416 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1417 int viewState = R.styleable.ViewDrawableStates[i]; 1418 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1419 if (VIEW_STATE_IDS[j] == viewState) { 1420 orderedIds[i * 2] = viewState; 1421 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1422 } 1423 } 1424 } 1425 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1426 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1427 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1428 int numBits = Integer.bitCount(i); 1429 int[] set = new int[numBits]; 1430 int pos = 0; 1431 for (int j = 0; j < orderedIds.length; j += 2) { 1432 if ((i & orderedIds[j+1]) != 0) { 1433 set[pos++] = orderedIds[j]; 1434 } 1435 } 1436 VIEW_STATE_SETS[i] = set; 1437 } 1438 1439 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1440 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1441 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1442 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1444 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1445 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1447 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1449 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1451 | VIEW_STATE_FOCUSED]; 1452 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1453 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1455 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1457 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_ENABLED]; 1460 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1462 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1464 | VIEW_STATE_ENABLED]; 1465 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1467 | VIEW_STATE_ENABLED]; 1468 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1471 1472 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1473 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1475 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1477 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1479 | VIEW_STATE_PRESSED]; 1480 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1482 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1483 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1484 | VIEW_STATE_PRESSED]; 1485 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1486 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1487 | VIEW_STATE_PRESSED]; 1488 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1489 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1490 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1491 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1492 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1493 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1494 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1495 | VIEW_STATE_PRESSED]; 1496 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1497 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1498 | VIEW_STATE_PRESSED]; 1499 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1500 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1501 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1502 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1503 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1504 | VIEW_STATE_PRESSED]; 1505 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1506 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1507 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1508 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1509 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1510 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1511 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1512 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1513 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1514 | VIEW_STATE_PRESSED]; 1515 } 1516 1517 /** 1518 * Accessibility event types that are dispatched for text population. 1519 */ 1520 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1521 AccessibilityEvent.TYPE_VIEW_CLICKED 1522 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1523 | AccessibilityEvent.TYPE_VIEW_SELECTED 1524 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1525 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1526 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1527 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1528 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1529 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1531 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1532 1533 /** 1534 * Temporary Rect currently for use in setBackground(). This will probably 1535 * be extended in the future to hold our own class with more than just 1536 * a Rect. :) 1537 */ 1538 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1539 1540 /** 1541 * Map used to store views' tags. 1542 */ 1543 private SparseArray<Object> mKeyedTags; 1544 1545 /** 1546 * The next available accessiiblity id. 1547 */ 1548 private static int sNextAccessibilityViewId; 1549 1550 /** 1551 * The animation currently associated with this view. 1552 * @hide 1553 */ 1554 protected Animation mCurrentAnimation = null; 1555 1556 /** 1557 * Width as measured during measure pass. 1558 * {@hide} 1559 */ 1560 @ViewDebug.ExportedProperty(category = "measurement") 1561 int mMeasuredWidth; 1562 1563 /** 1564 * Height as measured during measure pass. 1565 * {@hide} 1566 */ 1567 @ViewDebug.ExportedProperty(category = "measurement") 1568 int mMeasuredHeight; 1569 1570 /** 1571 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1572 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1573 * its display list. This flag, used only when hw accelerated, allows us to clear the 1574 * flag while retaining this information until it's needed (at getDisplayList() time and 1575 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1576 * 1577 * {@hide} 1578 */ 1579 boolean mRecreateDisplayList = false; 1580 1581 /** 1582 * The view's identifier. 1583 * {@hide} 1584 * 1585 * @see #setId(int) 1586 * @see #getId() 1587 */ 1588 @ViewDebug.ExportedProperty(resolveId = true) 1589 int mID = NO_ID; 1590 1591 /** 1592 * The stable ID of this view for accessibility purposes. 1593 */ 1594 int mAccessibilityViewId = NO_ID; 1595 1596 /** 1597 * @hide 1598 */ 1599 private int mAccessibilityCursorPosition = -1; 1600 1601 /** 1602 * The view's tag. 1603 * {@hide} 1604 * 1605 * @see #setTag(Object) 1606 * @see #getTag() 1607 */ 1608 protected Object mTag; 1609 1610 // for mPrivateFlags: 1611 /** {@hide} */ 1612 static final int WANTS_FOCUS = 0x00000001; 1613 /** {@hide} */ 1614 static final int FOCUSED = 0x00000002; 1615 /** {@hide} */ 1616 static final int SELECTED = 0x00000004; 1617 /** {@hide} */ 1618 static final int IS_ROOT_NAMESPACE = 0x00000008; 1619 /** {@hide} */ 1620 static final int HAS_BOUNDS = 0x00000010; 1621 /** {@hide} */ 1622 static final int DRAWN = 0x00000020; 1623 /** 1624 * When this flag is set, this view is running an animation on behalf of its 1625 * children and should therefore not cancel invalidate requests, even if they 1626 * lie outside of this view's bounds. 1627 * 1628 * {@hide} 1629 */ 1630 static final int DRAW_ANIMATION = 0x00000040; 1631 /** {@hide} */ 1632 static final int SKIP_DRAW = 0x00000080; 1633 /** {@hide} */ 1634 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1635 /** {@hide} */ 1636 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1637 /** {@hide} */ 1638 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1639 /** {@hide} */ 1640 static final int MEASURED_DIMENSION_SET = 0x00000800; 1641 /** {@hide} */ 1642 static final int FORCE_LAYOUT = 0x00001000; 1643 /** {@hide} */ 1644 static final int LAYOUT_REQUIRED = 0x00002000; 1645 1646 private static final int PRESSED = 0x00004000; 1647 1648 /** {@hide} */ 1649 static final int DRAWING_CACHE_VALID = 0x00008000; 1650 /** 1651 * Flag used to indicate that this view should be drawn once more (and only once 1652 * more) after its animation has completed. 1653 * {@hide} 1654 */ 1655 static final int ANIMATION_STARTED = 0x00010000; 1656 1657 private static final int SAVE_STATE_CALLED = 0x00020000; 1658 1659 /** 1660 * Indicates that the View returned true when onSetAlpha() was called and that 1661 * the alpha must be restored. 1662 * {@hide} 1663 */ 1664 static final int ALPHA_SET = 0x00040000; 1665 1666 /** 1667 * Set by {@link #setScrollContainer(boolean)}. 1668 */ 1669 static final int SCROLL_CONTAINER = 0x00080000; 1670 1671 /** 1672 * Set by {@link #setScrollContainer(boolean)}. 1673 */ 1674 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1675 1676 /** 1677 * View flag indicating whether this view was invalidated (fully or partially.) 1678 * 1679 * @hide 1680 */ 1681 static final int DIRTY = 0x00200000; 1682 1683 /** 1684 * View flag indicating whether this view was invalidated by an opaque 1685 * invalidate request. 1686 * 1687 * @hide 1688 */ 1689 static final int DIRTY_OPAQUE = 0x00400000; 1690 1691 /** 1692 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1693 * 1694 * @hide 1695 */ 1696 static final int DIRTY_MASK = 0x00600000; 1697 1698 /** 1699 * Indicates whether the background is opaque. 1700 * 1701 * @hide 1702 */ 1703 static final int OPAQUE_BACKGROUND = 0x00800000; 1704 1705 /** 1706 * Indicates whether the scrollbars are opaque. 1707 * 1708 * @hide 1709 */ 1710 static final int OPAQUE_SCROLLBARS = 0x01000000; 1711 1712 /** 1713 * Indicates whether the view is opaque. 1714 * 1715 * @hide 1716 */ 1717 static final int OPAQUE_MASK = 0x01800000; 1718 1719 /** 1720 * Indicates a prepressed state; 1721 * the short time between ACTION_DOWN and recognizing 1722 * a 'real' press. Prepressed is used to recognize quick taps 1723 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1724 * 1725 * @hide 1726 */ 1727 private static final int PREPRESSED = 0x02000000; 1728 1729 /** 1730 * Indicates whether the view is temporarily detached. 1731 * 1732 * @hide 1733 */ 1734 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1735 1736 /** 1737 * Indicates that we should awaken scroll bars once attached 1738 * 1739 * @hide 1740 */ 1741 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1742 1743 /** 1744 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1745 * @hide 1746 */ 1747 private static final int HOVERED = 0x10000000; 1748 1749 /** 1750 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1751 * for transform operations 1752 * 1753 * @hide 1754 */ 1755 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1756 1757 /** {@hide} */ 1758 static final int ACTIVATED = 0x40000000; 1759 1760 /** 1761 * Indicates that this view was specifically invalidated, not just dirtied because some 1762 * child view was invalidated. The flag is used to determine when we need to recreate 1763 * a view's display list (as opposed to just returning a reference to its existing 1764 * display list). 1765 * 1766 * @hide 1767 */ 1768 static final int INVALIDATED = 0x80000000; 1769 1770 /* Masks for mPrivateFlags2 */ 1771 1772 /** 1773 * Indicates that this view has reported that it can accept the current drag's content. 1774 * Cleared when the drag operation concludes. 1775 * @hide 1776 */ 1777 static final int DRAG_CAN_ACCEPT = 0x00000001; 1778 1779 /** 1780 * Indicates that this view is currently directly under the drag location in a 1781 * drag-and-drop operation involving content that it can accept. Cleared when 1782 * the drag exits the view, or when the drag operation concludes. 1783 * @hide 1784 */ 1785 static final int DRAG_HOVERED = 0x00000002; 1786 1787 /** 1788 * Horizontal layout direction of this view is from Left to Right. 1789 * Use with {@link #setLayoutDirection}. 1790 * @hide 1791 */ 1792 public static final int LAYOUT_DIRECTION_LTR = 0; 1793 1794 /** 1795 * Horizontal layout direction of this view is from Right to Left. 1796 * Use with {@link #setLayoutDirection}. 1797 * @hide 1798 */ 1799 public static final int LAYOUT_DIRECTION_RTL = 1; 1800 1801 /** 1802 * Horizontal layout direction of this view is inherited from its parent. 1803 * Use with {@link #setLayoutDirection}. 1804 * @hide 1805 */ 1806 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1807 1808 /** 1809 * Horizontal layout direction of this view is from deduced from the default language 1810 * script for the locale. Use with {@link #setLayoutDirection}. 1811 * @hide 1812 */ 1813 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /** 1828 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1829 * right-to-left direction. 1830 * @hide 1831 */ 1832 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1833 1834 /** 1835 * Indicates whether the view horizontal layout direction has been resolved. 1836 * @hide 1837 */ 1838 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1842 * @hide 1843 */ 1844 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /* 1847 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1848 * flag value. 1849 * @hide 1850 */ 1851 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1852 LAYOUT_DIRECTION_LTR, 1853 LAYOUT_DIRECTION_RTL, 1854 LAYOUT_DIRECTION_INHERIT, 1855 LAYOUT_DIRECTION_LOCALE 1856 }; 1857 1858 /** 1859 * Default horizontal layout direction. 1860 * @hide 1861 */ 1862 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1863 1864 /** 1865 * Indicates that the view is tracking some sort of transient state 1866 * that the app should not need to be aware of, but that the framework 1867 * should take special care to preserve. 1868 * 1869 * @hide 1870 */ 1871 static final int HAS_TRANSIENT_STATE = 0x00000100; 1872 1873 1874 /** 1875 * Text direction is inherited thru {@link ViewGroup} 1876 * @hide 1877 */ 1878 public static final int TEXT_DIRECTION_INHERIT = 0; 1879 1880 /** 1881 * Text direction is using "first strong algorithm". The first strong directional character 1882 * determines the paragraph direction. If there is no strong directional character, the 1883 * paragraph direction is the view's resolved layout direction. 1884 * @hide 1885 */ 1886 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1887 1888 /** 1889 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1890 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1891 * If there are neither, the paragraph direction is the view's resolved layout direction. 1892 * @hide 1893 */ 1894 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1895 1896 /** 1897 * Text direction is forced to LTR. 1898 * @hide 1899 */ 1900 public static final int TEXT_DIRECTION_LTR = 3; 1901 1902 /** 1903 * Text direction is forced to RTL. 1904 * @hide 1905 */ 1906 public static final int TEXT_DIRECTION_RTL = 4; 1907 1908 /** 1909 * Text direction is coming from the system Locale. 1910 * @hide 1911 */ 1912 public static final int TEXT_DIRECTION_LOCALE = 5; 1913 1914 /** 1915 * Default text direction is inherited 1916 * @hide 1917 */ 1918 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1919 1920 /** 1921 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1922 * @hide 1923 */ 1924 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1925 1926 /** 1927 * Mask for use with private flags indicating bits used for text direction. 1928 * @hide 1929 */ 1930 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1931 1932 /** 1933 * Array of text direction flags for mapping attribute "textDirection" to correct 1934 * flag value. 1935 * @hide 1936 */ 1937 private static final int[] TEXT_DIRECTION_FLAGS = { 1938 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1939 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1940 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1941 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1942 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1943 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1944 }; 1945 1946 /** 1947 * Indicates whether the view text direction has been resolved. 1948 * @hide 1949 */ 1950 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1951 1952 /** 1953 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1954 * @hide 1955 */ 1956 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1957 1958 /** 1959 * Mask for use with private flags indicating bits used for resolved text direction. 1960 * @hide 1961 */ 1962 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /** 1965 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1966 * @hide 1967 */ 1968 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1969 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1970 1971 /* 1972 * Default text alignment. The text alignment of this View is inherited from its parent. 1973 * Use with {@link #setTextAlignment(int)} 1974 * @hide 1975 */ 1976 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1977 1978 /** 1979 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1980 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1981 * 1982 * Use with {@link #setTextAlignment(int)} 1983 * @hide 1984 */ 1985 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1986 1987 /** 1988 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1989 * 1990 * Use with {@link #setTextAlignment(int)} 1991 * @hide 1992 */ 1993 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1994 1995 /** 1996 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1997 * 1998 * Use with {@link #setTextAlignment(int)} 1999 * @hide 2000 */ 2001 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2002 2003 /** 2004 * Center the paragraph, e.g. ALIGN_CENTER. 2005 * 2006 * Use with {@link #setTextAlignment(int)} 2007 * @hide 2008 */ 2009 public static final int TEXT_ALIGNMENT_CENTER = 4; 2010 2011 /** 2012 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2013 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2014 * 2015 * Use with {@link #setTextAlignment(int)} 2016 * @hide 2017 */ 2018 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2019 2020 /** 2021 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2022 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2023 * 2024 * Use with {@link #setTextAlignment(int)} 2025 * @hide 2026 */ 2027 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2028 2029 /** 2030 * Default text alignment is inherited 2031 * @hide 2032 */ 2033 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2034 2035 /** 2036 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2037 * @hide 2038 */ 2039 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2040 2041 /** 2042 * Mask for use with private flags indicating bits used for text alignment. 2043 * @hide 2044 */ 2045 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2046 2047 /** 2048 * Array of text direction flags for mapping attribute "textAlignment" to correct 2049 * flag value. 2050 * @hide 2051 */ 2052 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2053 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2054 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2055 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2056 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2057 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2058 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2059 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2060 }; 2061 2062 /** 2063 * Indicates whether the view text alignment has been resolved. 2064 * @hide 2065 */ 2066 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2067 2068 /** 2069 * Bit shift to get the resolved text alignment. 2070 * @hide 2071 */ 2072 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2073 2074 /** 2075 * Mask for use with private flags indicating bits used for text alignment. 2076 * @hide 2077 */ 2078 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2079 2080 /** 2081 * Indicates whether if the view text alignment has been resolved to gravity 2082 */ 2083 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2084 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2085 2086 // Accessiblity constants for mPrivateFlags2 2087 2088 /** 2089 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2090 */ 2091 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2092 2093 /** 2094 * Automatically determine whether a view is important for accessibility. 2095 */ 2096 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2097 2098 /** 2099 * The view is important for accessibility. 2100 */ 2101 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2102 2103 /** 2104 * The view is not important for accessibility. 2105 */ 2106 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2107 2108 /** 2109 * The default whether the view is important for accessiblity. 2110 */ 2111 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2112 2113 /** 2114 * Mask for obtainig the bits which specify how to determine 2115 * whether a view is important for accessibility. 2116 */ 2117 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2118 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2119 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2120 2121 /** 2122 * Flag indicating whether a view has accessibility focus. 2123 */ 2124 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2125 2126 /** 2127 * Flag indicating whether a view state for accessibility has changed. 2128 */ 2129 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2130 2131 /** 2132 * Flag indicating that view has an animation set on it. This is used to track whether an 2133 * animation is cleared between successive frames, in order to tell the associated 2134 * DisplayList to clear its animation matrix. 2135 */ 2136 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x10000000; 2137 2138 /** 2139 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2140 * is used to check whether later changes to the view's transform should invalidate the 2141 * view to force the quickReject test to run again. 2142 */ 2143 static final int VIEW_QUICK_REJECTED = 0x20000000; 2144 2145 /* End of masks for mPrivateFlags2 */ 2146 2147 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2148 2149 /** 2150 * Always allow a user to over-scroll this view, provided it is a 2151 * view that can scroll. 2152 * 2153 * @see #getOverScrollMode() 2154 * @see #setOverScrollMode(int) 2155 */ 2156 public static final int OVER_SCROLL_ALWAYS = 0; 2157 2158 /** 2159 * Allow a user to over-scroll this view only if the content is large 2160 * enough to meaningfully scroll, provided it is a view that can scroll. 2161 * 2162 * @see #getOverScrollMode() 2163 * @see #setOverScrollMode(int) 2164 */ 2165 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2166 2167 /** 2168 * Never allow a user to over-scroll this view. 2169 * 2170 * @see #getOverScrollMode() 2171 * @see #setOverScrollMode(int) 2172 */ 2173 public static final int OVER_SCROLL_NEVER = 2; 2174 2175 /** 2176 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2177 * requested the system UI (status bar) to be visible (the default). 2178 * 2179 * @see #setSystemUiVisibility(int) 2180 */ 2181 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2182 2183 /** 2184 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2185 * system UI to enter an unobtrusive "low profile" mode. 2186 * 2187 * <p>This is for use in games, book readers, video players, or any other 2188 * "immersive" application where the usual system chrome is deemed too distracting. 2189 * 2190 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2191 * 2192 * @see #setSystemUiVisibility(int) 2193 */ 2194 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2195 2196 /** 2197 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2198 * system navigation be temporarily hidden. 2199 * 2200 * <p>This is an even less obtrusive state than that called for by 2201 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2202 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2203 * those to disappear. This is useful (in conjunction with the 2204 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2205 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2206 * window flags) for displaying content using every last pixel on the display. 2207 * 2208 * <p>There is a limitation: because navigation controls are so important, the least user 2209 * interaction will cause them to reappear immediately. When this happens, both 2210 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2211 * so that both elements reappear at the same time. 2212 * 2213 * @see #setSystemUiVisibility(int) 2214 */ 2215 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2216 2217 /** 2218 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2219 * into the normal fullscreen mode so that its content can take over the screen 2220 * while still allowing the user to interact with the application. 2221 * 2222 * <p>This has the same visual effect as 2223 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2224 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2225 * meaning that non-critical screen decorations (such as the status bar) will be 2226 * hidden while the user is in the View's window, focusing the experience on 2227 * that content. Unlike the window flag, if you are using ActionBar in 2228 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2229 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2230 * hide the action bar. 2231 * 2232 * <p>This approach to going fullscreen is best used over the window flag when 2233 * it is a transient state -- that is, the application does this at certain 2234 * points in its user interaction where it wants to allow the user to focus 2235 * on content, but not as a continuous state. For situations where the application 2236 * would like to simply stay full screen the entire time (such as a game that 2237 * wants to take over the screen), the 2238 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2239 * is usually a better approach. The state set here will be removed by the system 2240 * in various situations (such as the user moving to another application) like 2241 * the other system UI states. 2242 * 2243 * <p>When using this flag, the application should provide some easy facility 2244 * for the user to go out of it. A common example would be in an e-book 2245 * reader, where tapping on the screen brings back whatever screen and UI 2246 * decorations that had been hidden while the user was immersed in reading 2247 * the book. 2248 * 2249 * @see #setSystemUiVisibility(int) 2250 */ 2251 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2252 2253 /** 2254 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2255 * flags, we would like a stable view of the content insets given to 2256 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2257 * will always represent the worst case that the application can expect 2258 * as a continue state. In practice this means with any of system bar, 2259 * nav bar, and status bar shown, but not the space that would be needed 2260 * for an input method. 2261 * 2262 * <p>If you are using ActionBar in 2263 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2264 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2265 * insets it adds to those given to the application. 2266 */ 2267 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2268 2269 /** 2270 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2271 * to be layed out as if it has requested 2272 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2273 * allows it to avoid artifacts when switching in and out of that mode, at 2274 * the expense that some of its user interface may be covered by screen 2275 * decorations when they are shown. You can perform layout of your inner 2276 * UI elements to account for the navagation system UI through the 2277 * {@link #fitSystemWindows(Rect)} method. 2278 */ 2279 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2280 2281 /** 2282 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2283 * to be layed out as if it has requested 2284 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2285 * allows it to avoid artifacts when switching in and out of that mode, at 2286 * the expense that some of its user interface may be covered by screen 2287 * decorations when they are shown. You can perform layout of your inner 2288 * UI elements to account for non-fullscreen system UI through the 2289 * {@link #fitSystemWindows(Rect)} method. 2290 */ 2291 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2292 2293 /** 2294 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2295 */ 2296 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2297 2298 /** 2299 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2300 */ 2301 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2302 2303 /** 2304 * @hide 2305 * 2306 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2307 * out of the public fields to keep the undefined bits out of the developer's way. 2308 * 2309 * Flag to make the status bar not expandable. Unless you also 2310 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2311 */ 2312 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2313 2314 /** 2315 * @hide 2316 * 2317 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2318 * out of the public fields to keep the undefined bits out of the developer's way. 2319 * 2320 * Flag to hide notification icons and scrolling ticker text. 2321 */ 2322 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2323 2324 /** 2325 * @hide 2326 * 2327 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2328 * out of the public fields to keep the undefined bits out of the developer's way. 2329 * 2330 * Flag to disable incoming notification alerts. This will not block 2331 * icons, but it will block sound, vibrating and other visual or aural notifications. 2332 */ 2333 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2334 2335 /** 2336 * @hide 2337 * 2338 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2339 * out of the public fields to keep the undefined bits out of the developer's way. 2340 * 2341 * Flag to hide only the scrolling ticker. Note that 2342 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2343 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2344 */ 2345 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2346 2347 /** 2348 * @hide 2349 * 2350 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2351 * out of the public fields to keep the undefined bits out of the developer's way. 2352 * 2353 * Flag to hide the center system info area. 2354 */ 2355 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2356 2357 /** 2358 * @hide 2359 * 2360 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2361 * out of the public fields to keep the undefined bits out of the developer's way. 2362 * 2363 * Flag to hide only the home button. Don't use this 2364 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2365 */ 2366 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2367 2368 /** 2369 * @hide 2370 * 2371 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2372 * out of the public fields to keep the undefined bits out of the developer's way. 2373 * 2374 * Flag to hide only the back button. Don't use this 2375 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2376 */ 2377 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2378 2379 /** 2380 * @hide 2381 * 2382 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2383 * out of the public fields to keep the undefined bits out of the developer's way. 2384 * 2385 * Flag to hide only the clock. You might use this if your activity has 2386 * its own clock making the status bar's clock redundant. 2387 */ 2388 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2389 2390 /** 2391 * @hide 2392 * 2393 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2394 * out of the public fields to keep the undefined bits out of the developer's way. 2395 * 2396 * Flag to hide only the recent apps button. Don't use this 2397 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2398 */ 2399 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2400 2401 /** 2402 * @hide 2403 */ 2404 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2405 2406 /** 2407 * These are the system UI flags that can be cleared by events outside 2408 * of an application. Currently this is just the ability to tap on the 2409 * screen while hiding the navigation bar to have it return. 2410 * @hide 2411 */ 2412 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2413 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2414 | SYSTEM_UI_FLAG_FULLSCREEN; 2415 2416 /** 2417 * Flags that can impact the layout in relation to system UI. 2418 */ 2419 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2420 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2421 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2422 2423 /** 2424 * Find views that render the specified text. 2425 * 2426 * @see #findViewsWithText(ArrayList, CharSequence, int) 2427 */ 2428 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2429 2430 /** 2431 * Find find views that contain the specified content description. 2432 * 2433 * @see #findViewsWithText(ArrayList, CharSequence, int) 2434 */ 2435 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2436 2437 /** 2438 * Find views that contain {@link AccessibilityNodeProvider}. Such 2439 * a View is a root of virtual view hierarchy and may contain the searched 2440 * text. If this flag is set Views with providers are automatically 2441 * added and it is a responsibility of the client to call the APIs of 2442 * the provider to determine whether the virtual tree rooted at this View 2443 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2444 * represeting the virtual views with this text. 2445 * 2446 * @see #findViewsWithText(ArrayList, CharSequence, int) 2447 * 2448 * @hide 2449 */ 2450 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2451 2452 /** 2453 * Indicates that the screen has changed state and is now off. 2454 * 2455 * @see #onScreenStateChanged(int) 2456 */ 2457 public static final int SCREEN_STATE_OFF = 0x0; 2458 2459 /** 2460 * Indicates that the screen has changed state and is now on. 2461 * 2462 * @see #onScreenStateChanged(int) 2463 */ 2464 public static final int SCREEN_STATE_ON = 0x1; 2465 2466 /** 2467 * Controls the over-scroll mode for this view. 2468 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2469 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2470 * and {@link #OVER_SCROLL_NEVER}. 2471 */ 2472 private int mOverScrollMode; 2473 2474 /** 2475 * The parent this view is attached to. 2476 * {@hide} 2477 * 2478 * @see #getParent() 2479 */ 2480 protected ViewParent mParent; 2481 2482 /** 2483 * {@hide} 2484 */ 2485 AttachInfo mAttachInfo; 2486 2487 /** 2488 * {@hide} 2489 */ 2490 @ViewDebug.ExportedProperty(flagMapping = { 2491 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2492 name = "FORCE_LAYOUT"), 2493 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2494 name = "LAYOUT_REQUIRED"), 2495 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2496 name = "DRAWING_CACHE_INVALID", outputIf = false), 2497 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2498 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2499 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2500 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2501 }) 2502 int mPrivateFlags; 2503 int mPrivateFlags2; 2504 2505 /** 2506 * This view's request for the visibility of the status bar. 2507 * @hide 2508 */ 2509 @ViewDebug.ExportedProperty(flagMapping = { 2510 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2511 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2512 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2513 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2514 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2515 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2516 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2517 equals = SYSTEM_UI_FLAG_VISIBLE, 2518 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2519 }) 2520 int mSystemUiVisibility; 2521 2522 /** 2523 * Reference count for transient state. 2524 * @see #setHasTransientState(boolean) 2525 */ 2526 int mTransientStateCount = 0; 2527 2528 /** 2529 * Count of how many windows this view has been attached to. 2530 */ 2531 int mWindowAttachCount; 2532 2533 /** 2534 * The layout parameters associated with this view and used by the parent 2535 * {@link android.view.ViewGroup} to determine how this view should be 2536 * laid out. 2537 * {@hide} 2538 */ 2539 protected ViewGroup.LayoutParams mLayoutParams; 2540 2541 /** 2542 * The view flags hold various views states. 2543 * {@hide} 2544 */ 2545 @ViewDebug.ExportedProperty 2546 int mViewFlags; 2547 2548 static class TransformationInfo { 2549 /** 2550 * The transform matrix for the View. This transform is calculated internally 2551 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2552 * is used by default. Do *not* use this variable directly; instead call 2553 * getMatrix(), which will automatically recalculate the matrix if necessary 2554 * to get the correct matrix based on the latest rotation and scale properties. 2555 */ 2556 private final Matrix mMatrix = new Matrix(); 2557 2558 /** 2559 * The transform matrix for the View. This transform is calculated internally 2560 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2561 * is used by default. Do *not* use this variable directly; instead call 2562 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2563 * to get the correct matrix based on the latest rotation and scale properties. 2564 */ 2565 private Matrix mInverseMatrix; 2566 2567 /** 2568 * An internal variable that tracks whether we need to recalculate the 2569 * transform matrix, based on whether the rotation or scaleX/Y properties 2570 * have changed since the matrix was last calculated. 2571 */ 2572 boolean mMatrixDirty = false; 2573 2574 /** 2575 * An internal variable that tracks whether we need to recalculate the 2576 * transform matrix, based on whether the rotation or scaleX/Y properties 2577 * have changed since the matrix was last calculated. 2578 */ 2579 private boolean mInverseMatrixDirty = true; 2580 2581 /** 2582 * A variable that tracks whether we need to recalculate the 2583 * transform matrix, based on whether the rotation or scaleX/Y properties 2584 * have changed since the matrix was last calculated. This variable 2585 * is only valid after a call to updateMatrix() or to a function that 2586 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2587 */ 2588 private boolean mMatrixIsIdentity = true; 2589 2590 /** 2591 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2592 */ 2593 private Camera mCamera = null; 2594 2595 /** 2596 * This matrix is used when computing the matrix for 3D rotations. 2597 */ 2598 private Matrix matrix3D = null; 2599 2600 /** 2601 * These prev values are used to recalculate a centered pivot point when necessary. The 2602 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2603 * set), so thes values are only used then as well. 2604 */ 2605 private int mPrevWidth = -1; 2606 private int mPrevHeight = -1; 2607 2608 /** 2609 * The degrees rotation around the vertical axis through the pivot point. 2610 */ 2611 @ViewDebug.ExportedProperty 2612 float mRotationY = 0f; 2613 2614 /** 2615 * The degrees rotation around the horizontal axis through the pivot point. 2616 */ 2617 @ViewDebug.ExportedProperty 2618 float mRotationX = 0f; 2619 2620 /** 2621 * The degrees rotation around the pivot point. 2622 */ 2623 @ViewDebug.ExportedProperty 2624 float mRotation = 0f; 2625 2626 /** 2627 * The amount of translation of the object away from its left property (post-layout). 2628 */ 2629 @ViewDebug.ExportedProperty 2630 float mTranslationX = 0f; 2631 2632 /** 2633 * The amount of translation of the object away from its top property (post-layout). 2634 */ 2635 @ViewDebug.ExportedProperty 2636 float mTranslationY = 0f; 2637 2638 /** 2639 * The amount of scale in the x direction around the pivot point. A 2640 * value of 1 means no scaling is applied. 2641 */ 2642 @ViewDebug.ExportedProperty 2643 float mScaleX = 1f; 2644 2645 /** 2646 * The amount of scale in the y direction around the pivot point. A 2647 * value of 1 means no scaling is applied. 2648 */ 2649 @ViewDebug.ExportedProperty 2650 float mScaleY = 1f; 2651 2652 /** 2653 * The x location of the point around which the view is rotated and scaled. 2654 */ 2655 @ViewDebug.ExportedProperty 2656 float mPivotX = 0f; 2657 2658 /** 2659 * The y location of the point around which the view is rotated and scaled. 2660 */ 2661 @ViewDebug.ExportedProperty 2662 float mPivotY = 0f; 2663 2664 /** 2665 * The opacity of the View. This is a value from 0 to 1, where 0 means 2666 * completely transparent and 1 means completely opaque. 2667 */ 2668 @ViewDebug.ExportedProperty 2669 float mAlpha = 1f; 2670 } 2671 2672 TransformationInfo mTransformationInfo; 2673 2674 private boolean mLastIsOpaque; 2675 2676 /** 2677 * Convenience value to check for float values that are close enough to zero to be considered 2678 * zero. 2679 */ 2680 private static final float NONZERO_EPSILON = .001f; 2681 2682 /** 2683 * The distance in pixels from the left edge of this view's parent 2684 * to the left edge of this view. 2685 * {@hide} 2686 */ 2687 @ViewDebug.ExportedProperty(category = "layout") 2688 protected int mLeft; 2689 /** 2690 * The distance in pixels from the left edge of this view's parent 2691 * to the right edge of this view. 2692 * {@hide} 2693 */ 2694 @ViewDebug.ExportedProperty(category = "layout") 2695 protected int mRight; 2696 /** 2697 * The distance in pixels from the top edge of this view's parent 2698 * to the top edge of this view. 2699 * {@hide} 2700 */ 2701 @ViewDebug.ExportedProperty(category = "layout") 2702 protected int mTop; 2703 /** 2704 * The distance in pixels from the top edge of this view's parent 2705 * to the bottom edge of this view. 2706 * {@hide} 2707 */ 2708 @ViewDebug.ExportedProperty(category = "layout") 2709 protected int mBottom; 2710 2711 /** 2712 * The offset, in pixels, by which the content of this view is scrolled 2713 * horizontally. 2714 * {@hide} 2715 */ 2716 @ViewDebug.ExportedProperty(category = "scrolling") 2717 protected int mScrollX; 2718 /** 2719 * The offset, in pixels, by which the content of this view is scrolled 2720 * vertically. 2721 * {@hide} 2722 */ 2723 @ViewDebug.ExportedProperty(category = "scrolling") 2724 protected int mScrollY; 2725 2726 /** 2727 * The left padding in pixels, that is the distance in pixels between the 2728 * left edge of this view and the left edge of its content. 2729 * {@hide} 2730 */ 2731 @ViewDebug.ExportedProperty(category = "padding") 2732 protected int mPaddingLeft; 2733 /** 2734 * The right padding in pixels, that is the distance in pixels between the 2735 * right edge of this view and the right edge of its content. 2736 * {@hide} 2737 */ 2738 @ViewDebug.ExportedProperty(category = "padding") 2739 protected int mPaddingRight; 2740 /** 2741 * The top padding in pixels, that is the distance in pixels between the 2742 * top edge of this view and the top edge of its content. 2743 * {@hide} 2744 */ 2745 @ViewDebug.ExportedProperty(category = "padding") 2746 protected int mPaddingTop; 2747 /** 2748 * The bottom padding in pixels, that is the distance in pixels between the 2749 * bottom edge of this view and the bottom edge of its content. 2750 * {@hide} 2751 */ 2752 @ViewDebug.ExportedProperty(category = "padding") 2753 protected int mPaddingBottom; 2754 2755 /** 2756 * The layout insets in pixels, that is the distance in pixels between the 2757 * visible edges of this view its bounds. 2758 */ 2759 private Insets mLayoutInsets; 2760 2761 /** 2762 * Briefly describes the view and is primarily used for accessibility support. 2763 */ 2764 private CharSequence mContentDescription; 2765 2766 /** 2767 * Cache the paddingRight set by the user to append to the scrollbar's size. 2768 * 2769 * @hide 2770 */ 2771 @ViewDebug.ExportedProperty(category = "padding") 2772 protected int mUserPaddingRight; 2773 2774 /** 2775 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2776 * 2777 * @hide 2778 */ 2779 @ViewDebug.ExportedProperty(category = "padding") 2780 protected int mUserPaddingBottom; 2781 2782 /** 2783 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2784 * 2785 * @hide 2786 */ 2787 @ViewDebug.ExportedProperty(category = "padding") 2788 protected int mUserPaddingLeft; 2789 2790 /** 2791 * Cache if the user padding is relative. 2792 * 2793 */ 2794 @ViewDebug.ExportedProperty(category = "padding") 2795 boolean mUserPaddingRelative; 2796 2797 /** 2798 * Cache the paddingStart set by the user to append to the scrollbar's size. 2799 * 2800 */ 2801 @ViewDebug.ExportedProperty(category = "padding") 2802 int mUserPaddingStart; 2803 2804 /** 2805 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2806 * 2807 */ 2808 @ViewDebug.ExportedProperty(category = "padding") 2809 int mUserPaddingEnd; 2810 2811 /** 2812 * @hide 2813 */ 2814 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2815 /** 2816 * @hide 2817 */ 2818 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2819 2820 private Drawable mBackground; 2821 2822 private int mBackgroundResource; 2823 private boolean mBackgroundSizeChanged; 2824 2825 static class ListenerInfo { 2826 /** 2827 * Listener used to dispatch focus change events. 2828 * This field should be made private, so it is hidden from the SDK. 2829 * {@hide} 2830 */ 2831 protected OnFocusChangeListener mOnFocusChangeListener; 2832 2833 /** 2834 * Listeners for layout change events. 2835 */ 2836 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2837 2838 /** 2839 * Listeners for attach events. 2840 */ 2841 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2842 2843 /** 2844 * Listener used to dispatch click events. 2845 * This field should be made private, so it is hidden from the SDK. 2846 * {@hide} 2847 */ 2848 public OnClickListener mOnClickListener; 2849 2850 /** 2851 * Listener used to dispatch long click events. 2852 * This field should be made private, so it is hidden from the SDK. 2853 * {@hide} 2854 */ 2855 protected OnLongClickListener mOnLongClickListener; 2856 2857 /** 2858 * Listener used to build the context menu. 2859 * This field should be made private, so it is hidden from the SDK. 2860 * {@hide} 2861 */ 2862 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2863 2864 private OnKeyListener mOnKeyListener; 2865 2866 private OnTouchListener mOnTouchListener; 2867 2868 private OnHoverListener mOnHoverListener; 2869 2870 private OnGenericMotionListener mOnGenericMotionListener; 2871 2872 private OnDragListener mOnDragListener; 2873 2874 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2875 } 2876 2877 ListenerInfo mListenerInfo; 2878 2879 /** 2880 * The application environment this view lives in. 2881 * This field should be made private, so it is hidden from the SDK. 2882 * {@hide} 2883 */ 2884 protected Context mContext; 2885 2886 private final Resources mResources; 2887 2888 private ScrollabilityCache mScrollCache; 2889 2890 private int[] mDrawableState = null; 2891 2892 /** 2893 * Set to true when drawing cache is enabled and cannot be created. 2894 * 2895 * @hide 2896 */ 2897 public boolean mCachingFailed; 2898 2899 private Bitmap mDrawingCache; 2900 private Bitmap mUnscaledDrawingCache; 2901 private HardwareLayer mHardwareLayer; 2902 DisplayList mDisplayList; 2903 2904 /** 2905 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2906 * the user may specify which view to go to next. 2907 */ 2908 private int mNextFocusLeftId = View.NO_ID; 2909 2910 /** 2911 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2912 * the user may specify which view to go to next. 2913 */ 2914 private int mNextFocusRightId = View.NO_ID; 2915 2916 /** 2917 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2918 * the user may specify which view to go to next. 2919 */ 2920 private int mNextFocusUpId = View.NO_ID; 2921 2922 /** 2923 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2924 * the user may specify which view to go to next. 2925 */ 2926 private int mNextFocusDownId = View.NO_ID; 2927 2928 /** 2929 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2930 * the user may specify which view to go to next. 2931 */ 2932 int mNextFocusForwardId = View.NO_ID; 2933 2934 private CheckForLongPress mPendingCheckForLongPress; 2935 private CheckForTap mPendingCheckForTap = null; 2936 private PerformClick mPerformClick; 2937 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2938 2939 private UnsetPressedState mUnsetPressedState; 2940 2941 /** 2942 * Whether the long press's action has been invoked. The tap's action is invoked on the 2943 * up event while a long press is invoked as soon as the long press duration is reached, so 2944 * a long press could be performed before the tap is checked, in which case the tap's action 2945 * should not be invoked. 2946 */ 2947 private boolean mHasPerformedLongPress; 2948 2949 /** 2950 * The minimum height of the view. We'll try our best to have the height 2951 * of this view to at least this amount. 2952 */ 2953 @ViewDebug.ExportedProperty(category = "measurement") 2954 private int mMinHeight; 2955 2956 /** 2957 * The minimum width of the view. We'll try our best to have the width 2958 * of this view to at least this amount. 2959 */ 2960 @ViewDebug.ExportedProperty(category = "measurement") 2961 private int mMinWidth; 2962 2963 /** 2964 * The delegate to handle touch events that are physically in this view 2965 * but should be handled by another view. 2966 */ 2967 private TouchDelegate mTouchDelegate = null; 2968 2969 /** 2970 * Solid color to use as a background when creating the drawing cache. Enables 2971 * the cache to use 16 bit bitmaps instead of 32 bit. 2972 */ 2973 private int mDrawingCacheBackgroundColor = 0; 2974 2975 /** 2976 * Special tree observer used when mAttachInfo is null. 2977 */ 2978 private ViewTreeObserver mFloatingTreeObserver; 2979 2980 /** 2981 * Cache the touch slop from the context that created the view. 2982 */ 2983 private int mTouchSlop; 2984 2985 /** 2986 * Object that handles automatic animation of view properties. 2987 */ 2988 private ViewPropertyAnimator mAnimator = null; 2989 2990 /** 2991 * Flag indicating that a drag can cross window boundaries. When 2992 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2993 * with this flag set, all visible applications will be able to participate 2994 * in the drag operation and receive the dragged content. 2995 * 2996 * @hide 2997 */ 2998 public static final int DRAG_FLAG_GLOBAL = 1; 2999 3000 /** 3001 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3002 */ 3003 private float mVerticalScrollFactor; 3004 3005 /** 3006 * Position of the vertical scroll bar. 3007 */ 3008 private int mVerticalScrollbarPosition; 3009 3010 /** 3011 * Position the scroll bar at the default position as determined by the system. 3012 */ 3013 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3014 3015 /** 3016 * Position the scroll bar along the left edge. 3017 */ 3018 public static final int SCROLLBAR_POSITION_LEFT = 1; 3019 3020 /** 3021 * Position the scroll bar along the right edge. 3022 */ 3023 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3024 3025 /** 3026 * Indicates that the view does not have a layer. 3027 * 3028 * @see #getLayerType() 3029 * @see #setLayerType(int, android.graphics.Paint) 3030 * @see #LAYER_TYPE_SOFTWARE 3031 * @see #LAYER_TYPE_HARDWARE 3032 */ 3033 public static final int LAYER_TYPE_NONE = 0; 3034 3035 /** 3036 * <p>Indicates that the view has a software layer. A software layer is backed 3037 * by a bitmap and causes the view to be rendered using Android's software 3038 * rendering pipeline, even if hardware acceleration is enabled.</p> 3039 * 3040 * <p>Software layers have various usages:</p> 3041 * <p>When the application is not using hardware acceleration, a software layer 3042 * is useful to apply a specific color filter and/or blending mode and/or 3043 * translucency to a view and all its children.</p> 3044 * <p>When the application is using hardware acceleration, a software layer 3045 * is useful to render drawing primitives not supported by the hardware 3046 * accelerated pipeline. It can also be used to cache a complex view tree 3047 * into a texture and reduce the complexity of drawing operations. For instance, 3048 * when animating a complex view tree with a translation, a software layer can 3049 * be used to render the view tree only once.</p> 3050 * <p>Software layers should be avoided when the affected view tree updates 3051 * often. Every update will require to re-render the software layer, which can 3052 * potentially be slow (particularly when hardware acceleration is turned on 3053 * since the layer will have to be uploaded into a hardware texture after every 3054 * update.)</p> 3055 * 3056 * @see #getLayerType() 3057 * @see #setLayerType(int, android.graphics.Paint) 3058 * @see #LAYER_TYPE_NONE 3059 * @see #LAYER_TYPE_HARDWARE 3060 */ 3061 public static final int LAYER_TYPE_SOFTWARE = 1; 3062 3063 /** 3064 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3065 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3066 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3067 * rendering pipeline, but only if hardware acceleration is turned on for the 3068 * view hierarchy. When hardware acceleration is turned off, hardware layers 3069 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3070 * 3071 * <p>A hardware layer is useful to apply a specific color filter and/or 3072 * blending mode and/or translucency to a view and all its children.</p> 3073 * <p>A hardware layer can be used to cache a complex view tree into a 3074 * texture and reduce the complexity of drawing operations. For instance, 3075 * when animating a complex view tree with a translation, a hardware layer can 3076 * be used to render the view tree only once.</p> 3077 * <p>A hardware layer can also be used to increase the rendering quality when 3078 * rotation transformations are applied on a view. It can also be used to 3079 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3080 * 3081 * @see #getLayerType() 3082 * @see #setLayerType(int, android.graphics.Paint) 3083 * @see #LAYER_TYPE_NONE 3084 * @see #LAYER_TYPE_SOFTWARE 3085 */ 3086 public static final int LAYER_TYPE_HARDWARE = 2; 3087 3088 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3089 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3090 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3091 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3092 }) 3093 int mLayerType = LAYER_TYPE_NONE; 3094 Paint mLayerPaint; 3095 Rect mLocalDirtyRect; 3096 3097 /** 3098 * Set to true when the view is sending hover accessibility events because it 3099 * is the innermost hovered view. 3100 */ 3101 private boolean mSendingHoverAccessibilityEvents; 3102 3103 /** 3104 * Simple constructor to use when creating a view from code. 3105 * 3106 * @param context The Context the view is running in, through which it can 3107 * access the current theme, resources, etc. 3108 */ 3109 public View(Context context) { 3110 mContext = context; 3111 mResources = context != null ? context.getResources() : null; 3112 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3113 // Set layout and text direction defaults 3114 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3115 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3116 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3117 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3118 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3119 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3120 mUserPaddingStart = -1; 3121 mUserPaddingEnd = -1; 3122 mUserPaddingRelative = false; 3123 } 3124 3125 /** 3126 * Delegate for injecting accessiblity functionality. 3127 */ 3128 AccessibilityDelegate mAccessibilityDelegate; 3129 3130 /** 3131 * Consistency verifier for debugging purposes. 3132 * @hide 3133 */ 3134 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3135 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3136 new InputEventConsistencyVerifier(this, 0) : null; 3137 3138 /** 3139 * Constructor that is called when inflating a view from XML. This is called 3140 * when a view is being constructed from an XML file, supplying attributes 3141 * that were specified in the XML file. This version uses a default style of 3142 * 0, so the only attribute values applied are those in the Context's Theme 3143 * and the given AttributeSet. 3144 * 3145 * <p> 3146 * The method onFinishInflate() will be called after all children have been 3147 * added. 3148 * 3149 * @param context The Context the view is running in, through which it can 3150 * access the current theme, resources, etc. 3151 * @param attrs The attributes of the XML tag that is inflating the view. 3152 * @see #View(Context, AttributeSet, int) 3153 */ 3154 public View(Context context, AttributeSet attrs) { 3155 this(context, attrs, 0); 3156 } 3157 3158 /** 3159 * Perform inflation from XML and apply a class-specific base style. This 3160 * constructor of View allows subclasses to use their own base style when 3161 * they are inflating. For example, a Button class's constructor would call 3162 * this version of the super class constructor and supply 3163 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3164 * the theme's button style to modify all of the base view attributes (in 3165 * particular its background) as well as the Button class's attributes. 3166 * 3167 * @param context The Context the view is running in, through which it can 3168 * access the current theme, resources, etc. 3169 * @param attrs The attributes of the XML tag that is inflating the view. 3170 * @param defStyle The default style to apply to this view. If 0, no style 3171 * will be applied (beyond what is included in the theme). This may 3172 * either be an attribute resource, whose value will be retrieved 3173 * from the current theme, or an explicit style resource. 3174 * @see #View(Context, AttributeSet) 3175 */ 3176 public View(Context context, AttributeSet attrs, int defStyle) { 3177 this(context); 3178 3179 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3180 defStyle, 0); 3181 3182 Drawable background = null; 3183 3184 int leftPadding = -1; 3185 int topPadding = -1; 3186 int rightPadding = -1; 3187 int bottomPadding = -1; 3188 int startPadding = -1; 3189 int endPadding = -1; 3190 3191 int padding = -1; 3192 3193 int viewFlagValues = 0; 3194 int viewFlagMasks = 0; 3195 3196 boolean setScrollContainer = false; 3197 3198 int x = 0; 3199 int y = 0; 3200 3201 float tx = 0; 3202 float ty = 0; 3203 float rotation = 0; 3204 float rotationX = 0; 3205 float rotationY = 0; 3206 float sx = 1f; 3207 float sy = 1f; 3208 boolean transformSet = false; 3209 3210 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3211 3212 int overScrollMode = mOverScrollMode; 3213 final int N = a.getIndexCount(); 3214 for (int i = 0; i < N; i++) { 3215 int attr = a.getIndex(i); 3216 switch (attr) { 3217 case com.android.internal.R.styleable.View_background: 3218 background = a.getDrawable(attr); 3219 break; 3220 case com.android.internal.R.styleable.View_padding: 3221 padding = a.getDimensionPixelSize(attr, -1); 3222 break; 3223 case com.android.internal.R.styleable.View_paddingLeft: 3224 leftPadding = a.getDimensionPixelSize(attr, -1); 3225 break; 3226 case com.android.internal.R.styleable.View_paddingTop: 3227 topPadding = a.getDimensionPixelSize(attr, -1); 3228 break; 3229 case com.android.internal.R.styleable.View_paddingRight: 3230 rightPadding = a.getDimensionPixelSize(attr, -1); 3231 break; 3232 case com.android.internal.R.styleable.View_paddingBottom: 3233 bottomPadding = a.getDimensionPixelSize(attr, -1); 3234 break; 3235 case com.android.internal.R.styleable.View_paddingStart: 3236 startPadding = a.getDimensionPixelSize(attr, -1); 3237 break; 3238 case com.android.internal.R.styleable.View_paddingEnd: 3239 endPadding = a.getDimensionPixelSize(attr, -1); 3240 break; 3241 case com.android.internal.R.styleable.View_scrollX: 3242 x = a.getDimensionPixelOffset(attr, 0); 3243 break; 3244 case com.android.internal.R.styleable.View_scrollY: 3245 y = a.getDimensionPixelOffset(attr, 0); 3246 break; 3247 case com.android.internal.R.styleable.View_alpha: 3248 setAlpha(a.getFloat(attr, 1f)); 3249 break; 3250 case com.android.internal.R.styleable.View_transformPivotX: 3251 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3252 break; 3253 case com.android.internal.R.styleable.View_transformPivotY: 3254 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3255 break; 3256 case com.android.internal.R.styleable.View_translationX: 3257 tx = a.getDimensionPixelOffset(attr, 0); 3258 transformSet = true; 3259 break; 3260 case com.android.internal.R.styleable.View_translationY: 3261 ty = a.getDimensionPixelOffset(attr, 0); 3262 transformSet = true; 3263 break; 3264 case com.android.internal.R.styleable.View_rotation: 3265 rotation = a.getFloat(attr, 0); 3266 transformSet = true; 3267 break; 3268 case com.android.internal.R.styleable.View_rotationX: 3269 rotationX = a.getFloat(attr, 0); 3270 transformSet = true; 3271 break; 3272 case com.android.internal.R.styleable.View_rotationY: 3273 rotationY = a.getFloat(attr, 0); 3274 transformSet = true; 3275 break; 3276 case com.android.internal.R.styleable.View_scaleX: 3277 sx = a.getFloat(attr, 1f); 3278 transformSet = true; 3279 break; 3280 case com.android.internal.R.styleable.View_scaleY: 3281 sy = a.getFloat(attr, 1f); 3282 transformSet = true; 3283 break; 3284 case com.android.internal.R.styleable.View_id: 3285 mID = a.getResourceId(attr, NO_ID); 3286 break; 3287 case com.android.internal.R.styleable.View_tag: 3288 mTag = a.getText(attr); 3289 break; 3290 case com.android.internal.R.styleable.View_fitsSystemWindows: 3291 if (a.getBoolean(attr, false)) { 3292 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3293 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3294 } 3295 break; 3296 case com.android.internal.R.styleable.View_focusable: 3297 if (a.getBoolean(attr, false)) { 3298 viewFlagValues |= FOCUSABLE; 3299 viewFlagMasks |= FOCUSABLE_MASK; 3300 } 3301 break; 3302 case com.android.internal.R.styleable.View_focusableInTouchMode: 3303 if (a.getBoolean(attr, false)) { 3304 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3305 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3306 } 3307 break; 3308 case com.android.internal.R.styleable.View_clickable: 3309 if (a.getBoolean(attr, false)) { 3310 viewFlagValues |= CLICKABLE; 3311 viewFlagMasks |= CLICKABLE; 3312 } 3313 break; 3314 case com.android.internal.R.styleable.View_longClickable: 3315 if (a.getBoolean(attr, false)) { 3316 viewFlagValues |= LONG_CLICKABLE; 3317 viewFlagMasks |= LONG_CLICKABLE; 3318 } 3319 break; 3320 case com.android.internal.R.styleable.View_saveEnabled: 3321 if (!a.getBoolean(attr, true)) { 3322 viewFlagValues |= SAVE_DISABLED; 3323 viewFlagMasks |= SAVE_DISABLED_MASK; 3324 } 3325 break; 3326 case com.android.internal.R.styleable.View_duplicateParentState: 3327 if (a.getBoolean(attr, false)) { 3328 viewFlagValues |= DUPLICATE_PARENT_STATE; 3329 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3330 } 3331 break; 3332 case com.android.internal.R.styleable.View_visibility: 3333 final int visibility = a.getInt(attr, 0); 3334 if (visibility != 0) { 3335 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3336 viewFlagMasks |= VISIBILITY_MASK; 3337 } 3338 break; 3339 case com.android.internal.R.styleable.View_layoutDirection: 3340 // Clear any layout direction flags (included resolved bits) already set 3341 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3342 // Set the layout direction flags depending on the value of the attribute 3343 final int layoutDirection = a.getInt(attr, -1); 3344 final int value = (layoutDirection != -1) ? 3345 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3346 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3347 break; 3348 case com.android.internal.R.styleable.View_drawingCacheQuality: 3349 final int cacheQuality = a.getInt(attr, 0); 3350 if (cacheQuality != 0) { 3351 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3352 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3353 } 3354 break; 3355 case com.android.internal.R.styleable.View_contentDescription: 3356 mContentDescription = a.getString(attr); 3357 break; 3358 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3359 if (!a.getBoolean(attr, true)) { 3360 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3361 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3362 } 3363 break; 3364 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3365 if (!a.getBoolean(attr, true)) { 3366 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3367 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3368 } 3369 break; 3370 case R.styleable.View_scrollbars: 3371 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3372 if (scrollbars != SCROLLBARS_NONE) { 3373 viewFlagValues |= scrollbars; 3374 viewFlagMasks |= SCROLLBARS_MASK; 3375 initializeScrollbars(a); 3376 } 3377 break; 3378 //noinspection deprecation 3379 case R.styleable.View_fadingEdge: 3380 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3381 // Ignore the attribute starting with ICS 3382 break; 3383 } 3384 // With builds < ICS, fall through and apply fading edges 3385 case R.styleable.View_requiresFadingEdge: 3386 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3387 if (fadingEdge != FADING_EDGE_NONE) { 3388 viewFlagValues |= fadingEdge; 3389 viewFlagMasks |= FADING_EDGE_MASK; 3390 initializeFadingEdge(a); 3391 } 3392 break; 3393 case R.styleable.View_scrollbarStyle: 3394 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3395 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3396 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3397 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3398 } 3399 break; 3400 case R.styleable.View_isScrollContainer: 3401 setScrollContainer = true; 3402 if (a.getBoolean(attr, false)) { 3403 setScrollContainer(true); 3404 } 3405 break; 3406 case com.android.internal.R.styleable.View_keepScreenOn: 3407 if (a.getBoolean(attr, false)) { 3408 viewFlagValues |= KEEP_SCREEN_ON; 3409 viewFlagMasks |= KEEP_SCREEN_ON; 3410 } 3411 break; 3412 case R.styleable.View_filterTouchesWhenObscured: 3413 if (a.getBoolean(attr, false)) { 3414 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3415 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3416 } 3417 break; 3418 case R.styleable.View_nextFocusLeft: 3419 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3420 break; 3421 case R.styleable.View_nextFocusRight: 3422 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3423 break; 3424 case R.styleable.View_nextFocusUp: 3425 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3426 break; 3427 case R.styleable.View_nextFocusDown: 3428 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3429 break; 3430 case R.styleable.View_nextFocusForward: 3431 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3432 break; 3433 case R.styleable.View_minWidth: 3434 mMinWidth = a.getDimensionPixelSize(attr, 0); 3435 break; 3436 case R.styleable.View_minHeight: 3437 mMinHeight = a.getDimensionPixelSize(attr, 0); 3438 break; 3439 case R.styleable.View_onClick: 3440 if (context.isRestricted()) { 3441 throw new IllegalStateException("The android:onClick attribute cannot " 3442 + "be used within a restricted context"); 3443 } 3444 3445 final String handlerName = a.getString(attr); 3446 if (handlerName != null) { 3447 setOnClickListener(new OnClickListener() { 3448 private Method mHandler; 3449 3450 public void onClick(View v) { 3451 if (mHandler == null) { 3452 try { 3453 mHandler = getContext().getClass().getMethod(handlerName, 3454 View.class); 3455 } catch (NoSuchMethodException e) { 3456 int id = getId(); 3457 String idText = id == NO_ID ? "" : " with id '" 3458 + getContext().getResources().getResourceEntryName( 3459 id) + "'"; 3460 throw new IllegalStateException("Could not find a method " + 3461 handlerName + "(View) in the activity " 3462 + getContext().getClass() + " for onClick handler" 3463 + " on view " + View.this.getClass() + idText, e); 3464 } 3465 } 3466 3467 try { 3468 mHandler.invoke(getContext(), View.this); 3469 } catch (IllegalAccessException e) { 3470 throw new IllegalStateException("Could not execute non " 3471 + "public method of the activity", e); 3472 } catch (InvocationTargetException e) { 3473 throw new IllegalStateException("Could not execute " 3474 + "method of the activity", e); 3475 } 3476 } 3477 }); 3478 } 3479 break; 3480 case R.styleable.View_overScrollMode: 3481 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3482 break; 3483 case R.styleable.View_verticalScrollbarPosition: 3484 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3485 break; 3486 case R.styleable.View_layerType: 3487 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3488 break; 3489 case R.styleable.View_textDirection: 3490 // Clear any text direction flag already set 3491 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3492 // Set the text direction flags depending on the value of the attribute 3493 final int textDirection = a.getInt(attr, -1); 3494 if (textDirection != -1) { 3495 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3496 } 3497 break; 3498 case R.styleable.View_textAlignment: 3499 // Clear any text alignment flag already set 3500 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3501 // Set the text alignment flag depending on the value of the attribute 3502 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3503 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3504 break; 3505 case R.styleable.View_importantForAccessibility: 3506 setImportantForAccessibility(a.getInt(attr, 3507 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3508 } 3509 } 3510 3511 a.recycle(); 3512 3513 setOverScrollMode(overScrollMode); 3514 3515 if (background != null) { 3516 setBackground(background); 3517 } 3518 3519 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3520 // layout direction). Those cached values will be used later during padding resolution. 3521 mUserPaddingStart = startPadding; 3522 mUserPaddingEnd = endPadding; 3523 3524 updateUserPaddingRelative(); 3525 3526 if (padding >= 0) { 3527 leftPadding = padding; 3528 topPadding = padding; 3529 rightPadding = padding; 3530 bottomPadding = padding; 3531 } 3532 3533 // If the user specified the padding (either with android:padding or 3534 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3535 // use the default padding or the padding from the background drawable 3536 // (stored at this point in mPadding*) 3537 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3538 topPadding >= 0 ? topPadding : mPaddingTop, 3539 rightPadding >= 0 ? rightPadding : mPaddingRight, 3540 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3541 3542 if (viewFlagMasks != 0) { 3543 setFlags(viewFlagValues, viewFlagMasks); 3544 } 3545 3546 // Needs to be called after mViewFlags is set 3547 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3548 recomputePadding(); 3549 } 3550 3551 if (x != 0 || y != 0) { 3552 scrollTo(x, y); 3553 } 3554 3555 if (transformSet) { 3556 setTranslationX(tx); 3557 setTranslationY(ty); 3558 setRotation(rotation); 3559 setRotationX(rotationX); 3560 setRotationY(rotationY); 3561 setScaleX(sx); 3562 setScaleY(sy); 3563 } 3564 3565 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3566 setScrollContainer(true); 3567 } 3568 3569 computeOpaqueFlags(); 3570 } 3571 3572 private void updateUserPaddingRelative() { 3573 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3574 } 3575 3576 /** 3577 * Non-public constructor for use in testing 3578 */ 3579 View() { 3580 mResources = null; 3581 } 3582 3583 /** 3584 * <p> 3585 * Initializes the fading edges from a given set of styled attributes. This 3586 * method should be called by subclasses that need fading edges and when an 3587 * instance of these subclasses is created programmatically rather than 3588 * being inflated from XML. This method is automatically called when the XML 3589 * is inflated. 3590 * </p> 3591 * 3592 * @param a the styled attributes set to initialize the fading edges from 3593 */ 3594 protected void initializeFadingEdge(TypedArray a) { 3595 initScrollCache(); 3596 3597 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3598 R.styleable.View_fadingEdgeLength, 3599 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3600 } 3601 3602 /** 3603 * Returns the size of the vertical faded edges used to indicate that more 3604 * content in this view is visible. 3605 * 3606 * @return The size in pixels of the vertical faded edge or 0 if vertical 3607 * faded edges are not enabled for this view. 3608 * @attr ref android.R.styleable#View_fadingEdgeLength 3609 */ 3610 public int getVerticalFadingEdgeLength() { 3611 if (isVerticalFadingEdgeEnabled()) { 3612 ScrollabilityCache cache = mScrollCache; 3613 if (cache != null) { 3614 return cache.fadingEdgeLength; 3615 } 3616 } 3617 return 0; 3618 } 3619 3620 /** 3621 * Set the size of the faded edge used to indicate that more content in this 3622 * view is available. Will not change whether the fading edge is enabled; use 3623 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3624 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3625 * for the vertical or horizontal fading edges. 3626 * 3627 * @param length The size in pixels of the faded edge used to indicate that more 3628 * content in this view is visible. 3629 */ 3630 public void setFadingEdgeLength(int length) { 3631 initScrollCache(); 3632 mScrollCache.fadingEdgeLength = length; 3633 } 3634 3635 /** 3636 * Returns the size of the horizontal faded edges used to indicate that more 3637 * content in this view is visible. 3638 * 3639 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3640 * faded edges are not enabled for this view. 3641 * @attr ref android.R.styleable#View_fadingEdgeLength 3642 */ 3643 public int getHorizontalFadingEdgeLength() { 3644 if (isHorizontalFadingEdgeEnabled()) { 3645 ScrollabilityCache cache = mScrollCache; 3646 if (cache != null) { 3647 return cache.fadingEdgeLength; 3648 } 3649 } 3650 return 0; 3651 } 3652 3653 /** 3654 * Returns the width of the vertical scrollbar. 3655 * 3656 * @return The width in pixels of the vertical scrollbar or 0 if there 3657 * is no vertical scrollbar. 3658 */ 3659 public int getVerticalScrollbarWidth() { 3660 ScrollabilityCache cache = mScrollCache; 3661 if (cache != null) { 3662 ScrollBarDrawable scrollBar = cache.scrollBar; 3663 if (scrollBar != null) { 3664 int size = scrollBar.getSize(true); 3665 if (size <= 0) { 3666 size = cache.scrollBarSize; 3667 } 3668 return size; 3669 } 3670 return 0; 3671 } 3672 return 0; 3673 } 3674 3675 /** 3676 * Returns the height of the horizontal scrollbar. 3677 * 3678 * @return The height in pixels of the horizontal scrollbar or 0 if 3679 * there is no horizontal scrollbar. 3680 */ 3681 protected int getHorizontalScrollbarHeight() { 3682 ScrollabilityCache cache = mScrollCache; 3683 if (cache != null) { 3684 ScrollBarDrawable scrollBar = cache.scrollBar; 3685 if (scrollBar != null) { 3686 int size = scrollBar.getSize(false); 3687 if (size <= 0) { 3688 size = cache.scrollBarSize; 3689 } 3690 return size; 3691 } 3692 return 0; 3693 } 3694 return 0; 3695 } 3696 3697 /** 3698 * <p> 3699 * Initializes the scrollbars from a given set of styled attributes. This 3700 * method should be called by subclasses that need scrollbars and when an 3701 * instance of these subclasses is created programmatically rather than 3702 * being inflated from XML. This method is automatically called when the XML 3703 * is inflated. 3704 * </p> 3705 * 3706 * @param a the styled attributes set to initialize the scrollbars from 3707 */ 3708 protected void initializeScrollbars(TypedArray a) { 3709 initScrollCache(); 3710 3711 final ScrollabilityCache scrollabilityCache = mScrollCache; 3712 3713 if (scrollabilityCache.scrollBar == null) { 3714 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3715 } 3716 3717 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3718 3719 if (!fadeScrollbars) { 3720 scrollabilityCache.state = ScrollabilityCache.ON; 3721 } 3722 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3723 3724 3725 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3726 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3727 .getScrollBarFadeDuration()); 3728 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3729 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3730 ViewConfiguration.getScrollDefaultDelay()); 3731 3732 3733 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3734 com.android.internal.R.styleable.View_scrollbarSize, 3735 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3736 3737 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3738 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3739 3740 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3741 if (thumb != null) { 3742 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3743 } 3744 3745 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3746 false); 3747 if (alwaysDraw) { 3748 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3749 } 3750 3751 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3752 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3753 3754 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3755 if (thumb != null) { 3756 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3757 } 3758 3759 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3760 false); 3761 if (alwaysDraw) { 3762 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3763 } 3764 3765 // Re-apply user/background padding so that scrollbar(s) get added 3766 resolvePadding(); 3767 } 3768 3769 /** 3770 * <p> 3771 * Initalizes the scrollability cache if necessary. 3772 * </p> 3773 */ 3774 private void initScrollCache() { 3775 if (mScrollCache == null) { 3776 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3777 } 3778 } 3779 3780 private ScrollabilityCache getScrollCache() { 3781 initScrollCache(); 3782 return mScrollCache; 3783 } 3784 3785 /** 3786 * Set the position of the vertical scroll bar. Should be one of 3787 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3788 * {@link #SCROLLBAR_POSITION_RIGHT}. 3789 * 3790 * @param position Where the vertical scroll bar should be positioned. 3791 */ 3792 public void setVerticalScrollbarPosition(int position) { 3793 if (mVerticalScrollbarPosition != position) { 3794 mVerticalScrollbarPosition = position; 3795 computeOpaqueFlags(); 3796 resolvePadding(); 3797 } 3798 } 3799 3800 /** 3801 * @return The position where the vertical scroll bar will show, if applicable. 3802 * @see #setVerticalScrollbarPosition(int) 3803 */ 3804 public int getVerticalScrollbarPosition() { 3805 return mVerticalScrollbarPosition; 3806 } 3807 3808 ListenerInfo getListenerInfo() { 3809 if (mListenerInfo != null) { 3810 return mListenerInfo; 3811 } 3812 mListenerInfo = new ListenerInfo(); 3813 return mListenerInfo; 3814 } 3815 3816 /** 3817 * Register a callback to be invoked when focus of this view changed. 3818 * 3819 * @param l The callback that will run. 3820 */ 3821 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3822 getListenerInfo().mOnFocusChangeListener = l; 3823 } 3824 3825 /** 3826 * Add a listener that will be called when the bounds of the view change due to 3827 * layout processing. 3828 * 3829 * @param listener The listener that will be called when layout bounds change. 3830 */ 3831 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3832 ListenerInfo li = getListenerInfo(); 3833 if (li.mOnLayoutChangeListeners == null) { 3834 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3835 } 3836 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3837 li.mOnLayoutChangeListeners.add(listener); 3838 } 3839 } 3840 3841 /** 3842 * Remove a listener for layout changes. 3843 * 3844 * @param listener The listener for layout bounds change. 3845 */ 3846 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3847 ListenerInfo li = mListenerInfo; 3848 if (li == null || li.mOnLayoutChangeListeners == null) { 3849 return; 3850 } 3851 li.mOnLayoutChangeListeners.remove(listener); 3852 } 3853 3854 /** 3855 * Add a listener for attach state changes. 3856 * 3857 * This listener will be called whenever this view is attached or detached 3858 * from a window. Remove the listener using 3859 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3860 * 3861 * @param listener Listener to attach 3862 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3863 */ 3864 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3865 ListenerInfo li = getListenerInfo(); 3866 if (li.mOnAttachStateChangeListeners == null) { 3867 li.mOnAttachStateChangeListeners 3868 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3869 } 3870 li.mOnAttachStateChangeListeners.add(listener); 3871 } 3872 3873 /** 3874 * Remove a listener for attach state changes. The listener will receive no further 3875 * notification of window attach/detach events. 3876 * 3877 * @param listener Listener to remove 3878 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3879 */ 3880 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3881 ListenerInfo li = mListenerInfo; 3882 if (li == null || li.mOnAttachStateChangeListeners == null) { 3883 return; 3884 } 3885 li.mOnAttachStateChangeListeners.remove(listener); 3886 } 3887 3888 /** 3889 * Returns the focus-change callback registered for this view. 3890 * 3891 * @return The callback, or null if one is not registered. 3892 */ 3893 public OnFocusChangeListener getOnFocusChangeListener() { 3894 ListenerInfo li = mListenerInfo; 3895 return li != null ? li.mOnFocusChangeListener : null; 3896 } 3897 3898 /** 3899 * Register a callback to be invoked when this view is clicked. If this view is not 3900 * clickable, it becomes clickable. 3901 * 3902 * @param l The callback that will run 3903 * 3904 * @see #setClickable(boolean) 3905 */ 3906 public void setOnClickListener(OnClickListener l) { 3907 if (!isClickable()) { 3908 setClickable(true); 3909 } 3910 getListenerInfo().mOnClickListener = l; 3911 } 3912 3913 /** 3914 * Return whether this view has an attached OnClickListener. Returns 3915 * true if there is a listener, false if there is none. 3916 */ 3917 public boolean hasOnClickListeners() { 3918 ListenerInfo li = mListenerInfo; 3919 return (li != null && li.mOnClickListener != null); 3920 } 3921 3922 /** 3923 * Register a callback to be invoked when this view is clicked and held. If this view is not 3924 * long clickable, it becomes long clickable. 3925 * 3926 * @param l The callback that will run 3927 * 3928 * @see #setLongClickable(boolean) 3929 */ 3930 public void setOnLongClickListener(OnLongClickListener l) { 3931 if (!isLongClickable()) { 3932 setLongClickable(true); 3933 } 3934 getListenerInfo().mOnLongClickListener = l; 3935 } 3936 3937 /** 3938 * Register a callback to be invoked when the context menu for this view is 3939 * being built. If this view is not long clickable, it becomes long clickable. 3940 * 3941 * @param l The callback that will run 3942 * 3943 */ 3944 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3945 if (!isLongClickable()) { 3946 setLongClickable(true); 3947 } 3948 getListenerInfo().mOnCreateContextMenuListener = l; 3949 } 3950 3951 /** 3952 * Call this view's OnClickListener, if it is defined. Performs all normal 3953 * actions associated with clicking: reporting accessibility event, playing 3954 * a sound, etc. 3955 * 3956 * @return True there was an assigned OnClickListener that was called, false 3957 * otherwise is returned. 3958 */ 3959 public boolean performClick() { 3960 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3961 3962 ListenerInfo li = mListenerInfo; 3963 if (li != null && li.mOnClickListener != null) { 3964 playSoundEffect(SoundEffectConstants.CLICK); 3965 li.mOnClickListener.onClick(this); 3966 return true; 3967 } 3968 3969 return false; 3970 } 3971 3972 /** 3973 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3974 * this only calls the listener, and does not do any associated clicking 3975 * actions like reporting an accessibility event. 3976 * 3977 * @return True there was an assigned OnClickListener that was called, false 3978 * otherwise is returned. 3979 */ 3980 public boolean callOnClick() { 3981 ListenerInfo li = mListenerInfo; 3982 if (li != null && li.mOnClickListener != null) { 3983 li.mOnClickListener.onClick(this); 3984 return true; 3985 } 3986 return false; 3987 } 3988 3989 /** 3990 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3991 * OnLongClickListener did not consume the event. 3992 * 3993 * @return True if one of the above receivers consumed the event, false otherwise. 3994 */ 3995 public boolean performLongClick() { 3996 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3997 3998 boolean handled = false; 3999 ListenerInfo li = mListenerInfo; 4000 if (li != null && li.mOnLongClickListener != null) { 4001 handled = li.mOnLongClickListener.onLongClick(View.this); 4002 } 4003 if (!handled) { 4004 handled = showContextMenu(); 4005 } 4006 if (handled) { 4007 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4008 } 4009 return handled; 4010 } 4011 4012 /** 4013 * Performs button-related actions during a touch down event. 4014 * 4015 * @param event The event. 4016 * @return True if the down was consumed. 4017 * 4018 * @hide 4019 */ 4020 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4021 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4022 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4023 return true; 4024 } 4025 } 4026 return false; 4027 } 4028 4029 /** 4030 * Bring up the context menu for this view. 4031 * 4032 * @return Whether a context menu was displayed. 4033 */ 4034 public boolean showContextMenu() { 4035 return getParent().showContextMenuForChild(this); 4036 } 4037 4038 /** 4039 * Bring up the context menu for this view, referring to the item under the specified point. 4040 * 4041 * @param x The referenced x coordinate. 4042 * @param y The referenced y coordinate. 4043 * @param metaState The keyboard modifiers that were pressed. 4044 * @return Whether a context menu was displayed. 4045 * 4046 * @hide 4047 */ 4048 public boolean showContextMenu(float x, float y, int metaState) { 4049 return showContextMenu(); 4050 } 4051 4052 /** 4053 * Start an action mode. 4054 * 4055 * @param callback Callback that will control the lifecycle of the action mode 4056 * @return The new action mode if it is started, null otherwise 4057 * 4058 * @see ActionMode 4059 */ 4060 public ActionMode startActionMode(ActionMode.Callback callback) { 4061 ViewParent parent = getParent(); 4062 if (parent == null) return null; 4063 return parent.startActionModeForChild(this, callback); 4064 } 4065 4066 /** 4067 * Register a callback to be invoked when a key is pressed in this view. 4068 * @param l the key listener to attach to this view 4069 */ 4070 public void setOnKeyListener(OnKeyListener l) { 4071 getListenerInfo().mOnKeyListener = l; 4072 } 4073 4074 /** 4075 * Register a callback to be invoked when a touch event is sent to this view. 4076 * @param l the touch listener to attach to this view 4077 */ 4078 public void setOnTouchListener(OnTouchListener l) { 4079 getListenerInfo().mOnTouchListener = l; 4080 } 4081 4082 /** 4083 * Register a callback to be invoked when a generic motion event is sent to this view. 4084 * @param l the generic motion listener to attach to this view 4085 */ 4086 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4087 getListenerInfo().mOnGenericMotionListener = l; 4088 } 4089 4090 /** 4091 * Register a callback to be invoked when a hover event is sent to this view. 4092 * @param l the hover listener to attach to this view 4093 */ 4094 public void setOnHoverListener(OnHoverListener l) { 4095 getListenerInfo().mOnHoverListener = l; 4096 } 4097 4098 /** 4099 * Register a drag event listener callback object for this View. The parameter is 4100 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4101 * View, the system calls the 4102 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4103 * @param l An implementation of {@link android.view.View.OnDragListener}. 4104 */ 4105 public void setOnDragListener(OnDragListener l) { 4106 getListenerInfo().mOnDragListener = l; 4107 } 4108 4109 /** 4110 * Give this view focus. This will cause 4111 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4112 * 4113 * Note: this does not check whether this {@link View} should get focus, it just 4114 * gives it focus no matter what. It should only be called internally by framework 4115 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4116 * 4117 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4118 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4119 * focus moved when requestFocus() is called. It may not always 4120 * apply, in which case use the default View.FOCUS_DOWN. 4121 * @param previouslyFocusedRect The rectangle of the view that had focus 4122 * prior in this View's coordinate system. 4123 */ 4124 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4125 if (DBG) { 4126 System.out.println(this + " requestFocus()"); 4127 } 4128 4129 if ((mPrivateFlags & FOCUSED) == 0) { 4130 mPrivateFlags |= FOCUSED; 4131 4132 if (mParent != null) { 4133 mParent.requestChildFocus(this, this); 4134 } 4135 4136 onFocusChanged(true, direction, previouslyFocusedRect); 4137 refreshDrawableState(); 4138 4139 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4140 notifyAccessibilityStateChanged(); 4141 } 4142 } 4143 } 4144 4145 /** 4146 * Request that a rectangle of this view be visible on the screen, 4147 * scrolling if necessary just enough. 4148 * 4149 * <p>A View should call this if it maintains some notion of which part 4150 * of its content is interesting. For example, a text editing view 4151 * should call this when its cursor moves. 4152 * 4153 * @param rectangle The rectangle. 4154 * @return Whether any parent scrolled. 4155 */ 4156 public boolean requestRectangleOnScreen(Rect rectangle) { 4157 return requestRectangleOnScreen(rectangle, false); 4158 } 4159 4160 /** 4161 * Request that a rectangle of this view be visible on the screen, 4162 * scrolling if necessary just enough. 4163 * 4164 * <p>A View should call this if it maintains some notion of which part 4165 * of its content is interesting. For example, a text editing view 4166 * should call this when its cursor moves. 4167 * 4168 * <p>When <code>immediate</code> is set to true, scrolling will not be 4169 * animated. 4170 * 4171 * @param rectangle The rectangle. 4172 * @param immediate True to forbid animated scrolling, false otherwise 4173 * @return Whether any parent scrolled. 4174 */ 4175 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4176 View child = this; 4177 ViewParent parent = mParent; 4178 boolean scrolled = false; 4179 while (parent != null) { 4180 scrolled |= parent.requestChildRectangleOnScreen(child, 4181 rectangle, immediate); 4182 4183 // offset rect so next call has the rectangle in the 4184 // coordinate system of its direct child. 4185 rectangle.offset(child.getLeft(), child.getTop()); 4186 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4187 4188 if (!(parent instanceof View)) { 4189 break; 4190 } 4191 4192 child = (View) parent; 4193 parent = child.getParent(); 4194 } 4195 return scrolled; 4196 } 4197 4198 /** 4199 * Called when this view wants to give up focus. If focus is cleared 4200 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4201 * <p> 4202 * <strong>Note:</strong> When a View clears focus the framework is trying 4203 * to give focus to the first focusable View from the top. Hence, if this 4204 * View is the first from the top that can take focus, then all callbacks 4205 * related to clearing focus will be invoked after wich the framework will 4206 * give focus to this view. 4207 * </p> 4208 */ 4209 public void clearFocus() { 4210 if (DBG) { 4211 System.out.println(this + " clearFocus()"); 4212 } 4213 4214 if ((mPrivateFlags & FOCUSED) != 0) { 4215 mPrivateFlags &= ~FOCUSED; 4216 4217 if (mParent != null) { 4218 mParent.clearChildFocus(this); 4219 } 4220 4221 onFocusChanged(false, 0, null); 4222 4223 refreshDrawableState(); 4224 4225 ensureInputFocusOnFirstFocusable(); 4226 4227 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4228 notifyAccessibilityStateChanged(); 4229 } 4230 } 4231 } 4232 4233 void ensureInputFocusOnFirstFocusable() { 4234 View root = getRootView(); 4235 if (root != null) { 4236 root.requestFocus(); 4237 } 4238 } 4239 4240 /** 4241 * Called internally by the view system when a new view is getting focus. 4242 * This is what clears the old focus. 4243 */ 4244 void unFocus() { 4245 if (DBG) { 4246 System.out.println(this + " unFocus()"); 4247 } 4248 4249 if ((mPrivateFlags & FOCUSED) != 0) { 4250 mPrivateFlags &= ~FOCUSED; 4251 4252 onFocusChanged(false, 0, null); 4253 refreshDrawableState(); 4254 4255 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4256 notifyAccessibilityStateChanged(); 4257 } 4258 } 4259 } 4260 4261 /** 4262 * Returns true if this view has focus iteself, or is the ancestor of the 4263 * view that has focus. 4264 * 4265 * @return True if this view has or contains focus, false otherwise. 4266 */ 4267 @ViewDebug.ExportedProperty(category = "focus") 4268 public boolean hasFocus() { 4269 return (mPrivateFlags & FOCUSED) != 0; 4270 } 4271 4272 /** 4273 * Returns true if this view is focusable or if it contains a reachable View 4274 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4275 * is a View whose parents do not block descendants focus. 4276 * 4277 * Only {@link #VISIBLE} views are considered focusable. 4278 * 4279 * @return True if the view is focusable or if the view contains a focusable 4280 * View, false otherwise. 4281 * 4282 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4283 */ 4284 public boolean hasFocusable() { 4285 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4286 } 4287 4288 /** 4289 * Called by the view system when the focus state of this view changes. 4290 * When the focus change event is caused by directional navigation, direction 4291 * and previouslyFocusedRect provide insight into where the focus is coming from. 4292 * When overriding, be sure to call up through to the super class so that 4293 * the standard focus handling will occur. 4294 * 4295 * @param gainFocus True if the View has focus; false otherwise. 4296 * @param direction The direction focus has moved when requestFocus() 4297 * is called to give this view focus. Values are 4298 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4299 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4300 * It may not always apply, in which case use the default. 4301 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4302 * system, of the previously focused view. If applicable, this will be 4303 * passed in as finer grained information about where the focus is coming 4304 * from (in addition to direction). Will be <code>null</code> otherwise. 4305 */ 4306 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4307 if (gainFocus) { 4308 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4309 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4310 requestAccessibilityFocus(); 4311 } 4312 } 4313 4314 InputMethodManager imm = InputMethodManager.peekInstance(); 4315 if (!gainFocus) { 4316 if (isPressed()) { 4317 setPressed(false); 4318 } 4319 if (imm != null && mAttachInfo != null 4320 && mAttachInfo.mHasWindowFocus) { 4321 imm.focusOut(this); 4322 } 4323 onFocusLost(); 4324 } else if (imm != null && mAttachInfo != null 4325 && mAttachInfo.mHasWindowFocus) { 4326 imm.focusIn(this); 4327 } 4328 4329 invalidate(true); 4330 ListenerInfo li = mListenerInfo; 4331 if (li != null && li.mOnFocusChangeListener != null) { 4332 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4333 } 4334 4335 if (mAttachInfo != null) { 4336 mAttachInfo.mKeyDispatchState.reset(this); 4337 } 4338 } 4339 4340 /** 4341 * Sends an accessibility event of the given type. If accessiiblity is 4342 * not enabled this method has no effect. The default implementation calls 4343 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4344 * to populate information about the event source (this View), then calls 4345 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4346 * populate the text content of the event source including its descendants, 4347 * and last calls 4348 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4349 * on its parent to resuest sending of the event to interested parties. 4350 * <p> 4351 * If an {@link AccessibilityDelegate} has been specified via calling 4352 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4353 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4354 * responsible for handling this call. 4355 * </p> 4356 * 4357 * @param eventType The type of the event to send, as defined by several types from 4358 * {@link android.view.accessibility.AccessibilityEvent}, such as 4359 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4360 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4361 * 4362 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4363 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4364 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4365 * @see AccessibilityDelegate 4366 */ 4367 public void sendAccessibilityEvent(int eventType) { 4368 if (mAccessibilityDelegate != null) { 4369 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4370 } else { 4371 sendAccessibilityEventInternal(eventType); 4372 } 4373 } 4374 4375 /** 4376 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4377 * {@link AccessibilityEvent} to make an announcement which is related to some 4378 * sort of a context change for which none of the events representing UI transitions 4379 * is a good fit. For example, announcing a new page in a book. If accessibility 4380 * is not enabled this method does nothing. 4381 * 4382 * @param text The announcement text. 4383 */ 4384 public void announceForAccessibility(CharSequence text) { 4385 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4386 AccessibilityEvent event = AccessibilityEvent.obtain( 4387 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4388 event.getText().add(text); 4389 sendAccessibilityEventUnchecked(event); 4390 } 4391 } 4392 4393 /** 4394 * @see #sendAccessibilityEvent(int) 4395 * 4396 * Note: Called from the default {@link AccessibilityDelegate}. 4397 */ 4398 void sendAccessibilityEventInternal(int eventType) { 4399 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4400 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4401 } 4402 } 4403 4404 /** 4405 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4406 * takes as an argument an empty {@link AccessibilityEvent} and does not 4407 * perform a check whether accessibility is enabled. 4408 * <p> 4409 * If an {@link AccessibilityDelegate} has been specified via calling 4410 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4411 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4412 * is responsible for handling this call. 4413 * </p> 4414 * 4415 * @param event The event to send. 4416 * 4417 * @see #sendAccessibilityEvent(int) 4418 */ 4419 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4420 if (mAccessibilityDelegate != null) { 4421 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4422 } else { 4423 sendAccessibilityEventUncheckedInternal(event); 4424 } 4425 } 4426 4427 /** 4428 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4429 * 4430 * Note: Called from the default {@link AccessibilityDelegate}. 4431 */ 4432 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4433 if (!isShown()) { 4434 return; 4435 } 4436 onInitializeAccessibilityEvent(event); 4437 // Only a subset of accessibility events populates text content. 4438 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4439 dispatchPopulateAccessibilityEvent(event); 4440 } 4441 // Intercept accessibility focus events fired by virtual nodes to keep 4442 // track of accessibility focus position in such nodes. 4443 final int eventType = event.getEventType(); 4444 switch (eventType) { 4445 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4446 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4447 event.getSourceNodeId()); 4448 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4449 ViewRootImpl viewRootImpl = getViewRootImpl(); 4450 if (viewRootImpl != null) { 4451 viewRootImpl.setAccessibilityFocusedHost(this); 4452 } 4453 } 4454 } break; 4455 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4456 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4457 event.getSourceNodeId()); 4458 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4459 ViewRootImpl viewRootImpl = getViewRootImpl(); 4460 if (viewRootImpl != null) { 4461 viewRootImpl.setAccessibilityFocusedHost(null); 4462 } 4463 } 4464 } break; 4465 } 4466 // In the beginning we called #isShown(), so we know that getParent() is not null. 4467 getParent().requestSendAccessibilityEvent(this, event); 4468 } 4469 4470 /** 4471 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4472 * to its children for adding their text content to the event. Note that the 4473 * event text is populated in a separate dispatch path since we add to the 4474 * event not only the text of the source but also the text of all its descendants. 4475 * A typical implementation will call 4476 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4477 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4478 * on each child. Override this method if custom population of the event text 4479 * content is required. 4480 * <p> 4481 * If an {@link AccessibilityDelegate} has been specified via calling 4482 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4483 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4484 * is responsible for handling this call. 4485 * </p> 4486 * <p> 4487 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4488 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4489 * </p> 4490 * 4491 * @param event The event. 4492 * 4493 * @return True if the event population was completed. 4494 */ 4495 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4496 if (mAccessibilityDelegate != null) { 4497 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4498 } else { 4499 return dispatchPopulateAccessibilityEventInternal(event); 4500 } 4501 } 4502 4503 /** 4504 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4505 * 4506 * Note: Called from the default {@link AccessibilityDelegate}. 4507 */ 4508 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4509 onPopulateAccessibilityEvent(event); 4510 return false; 4511 } 4512 4513 /** 4514 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4515 * giving a chance to this View to populate the accessibility event with its 4516 * text content. While this method is free to modify event 4517 * attributes other than text content, doing so should normally be performed in 4518 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4519 * <p> 4520 * Example: Adding formatted date string to an accessibility event in addition 4521 * to the text added by the super implementation: 4522 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4523 * super.onPopulateAccessibilityEvent(event); 4524 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4525 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4526 * mCurrentDate.getTimeInMillis(), flags); 4527 * event.getText().add(selectedDateUtterance); 4528 * }</pre> 4529 * <p> 4530 * If an {@link AccessibilityDelegate} has been specified via calling 4531 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4532 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4533 * is responsible for handling this call. 4534 * </p> 4535 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4536 * information to the event, in case the default implementation has basic information to add. 4537 * </p> 4538 * 4539 * @param event The accessibility event which to populate. 4540 * 4541 * @see #sendAccessibilityEvent(int) 4542 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4543 */ 4544 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4545 if (mAccessibilityDelegate != null) { 4546 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4547 } else { 4548 onPopulateAccessibilityEventInternal(event); 4549 } 4550 } 4551 4552 /** 4553 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4554 * 4555 * Note: Called from the default {@link AccessibilityDelegate}. 4556 */ 4557 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4558 4559 } 4560 4561 /** 4562 * Initializes an {@link AccessibilityEvent} with information about 4563 * this View which is the event source. In other words, the source of 4564 * an accessibility event is the view whose state change triggered firing 4565 * the event. 4566 * <p> 4567 * Example: Setting the password property of an event in addition 4568 * to properties set by the super implementation: 4569 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4570 * super.onInitializeAccessibilityEvent(event); 4571 * event.setPassword(true); 4572 * }</pre> 4573 * <p> 4574 * If an {@link AccessibilityDelegate} has been specified via calling 4575 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4576 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4577 * is responsible for handling this call. 4578 * </p> 4579 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4580 * information to the event, in case the default implementation has basic information to add. 4581 * </p> 4582 * @param event The event to initialize. 4583 * 4584 * @see #sendAccessibilityEvent(int) 4585 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4586 */ 4587 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4588 if (mAccessibilityDelegate != null) { 4589 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4590 } else { 4591 onInitializeAccessibilityEventInternal(event); 4592 } 4593 } 4594 4595 /** 4596 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4597 * 4598 * Note: Called from the default {@link AccessibilityDelegate}. 4599 */ 4600 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4601 event.setSource(this); 4602 event.setClassName(View.class.getName()); 4603 event.setPackageName(getContext().getPackageName()); 4604 event.setEnabled(isEnabled()); 4605 event.setContentDescription(mContentDescription); 4606 4607 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4608 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4609 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4610 FOCUSABLES_ALL); 4611 event.setItemCount(focusablesTempList.size()); 4612 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4613 focusablesTempList.clear(); 4614 } 4615 } 4616 4617 /** 4618 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4619 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4620 * This method is responsible for obtaining an accessibility node info from a 4621 * pool of reusable instances and calling 4622 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4623 * initialize the former. 4624 * <p> 4625 * Note: The client is responsible for recycling the obtained instance by calling 4626 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4627 * </p> 4628 * 4629 * @return A populated {@link AccessibilityNodeInfo}. 4630 * 4631 * @see AccessibilityNodeInfo 4632 */ 4633 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4634 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4635 if (provider != null) { 4636 return provider.createAccessibilityNodeInfo(View.NO_ID); 4637 } else { 4638 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4639 onInitializeAccessibilityNodeInfo(info); 4640 return info; 4641 } 4642 } 4643 4644 /** 4645 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4646 * The base implementation sets: 4647 * <ul> 4648 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4649 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4650 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4651 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4652 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4653 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4654 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4655 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4656 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4657 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4658 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4659 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4660 * </ul> 4661 * <p> 4662 * Subclasses should override this method, call the super implementation, 4663 * and set additional attributes. 4664 * </p> 4665 * <p> 4666 * If an {@link AccessibilityDelegate} has been specified via calling 4667 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4668 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4669 * is responsible for handling this call. 4670 * </p> 4671 * 4672 * @param info The instance to initialize. 4673 */ 4674 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4675 if (mAccessibilityDelegate != null) { 4676 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4677 } else { 4678 onInitializeAccessibilityNodeInfoInternal(info); 4679 } 4680 } 4681 4682 /** 4683 * Gets the location of this view in screen coordintates. 4684 * 4685 * @param outRect The output location 4686 */ 4687 private void getBoundsOnScreen(Rect outRect) { 4688 if (mAttachInfo == null) { 4689 return; 4690 } 4691 4692 RectF position = mAttachInfo.mTmpTransformRect; 4693 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4694 4695 if (!hasIdentityMatrix()) { 4696 getMatrix().mapRect(position); 4697 } 4698 4699 position.offset(mLeft, mTop); 4700 4701 ViewParent parent = mParent; 4702 while (parent instanceof View) { 4703 View parentView = (View) parent; 4704 4705 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4706 4707 if (!parentView.hasIdentityMatrix()) { 4708 parentView.getMatrix().mapRect(position); 4709 } 4710 4711 position.offset(parentView.mLeft, parentView.mTop); 4712 4713 parent = parentView.mParent; 4714 } 4715 4716 if (parent instanceof ViewRootImpl) { 4717 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4718 position.offset(0, -viewRootImpl.mCurScrollY); 4719 } 4720 4721 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4722 4723 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4724 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4725 } 4726 4727 /** 4728 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4729 * 4730 * Note: Called from the default {@link AccessibilityDelegate}. 4731 */ 4732 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4733 Rect bounds = mAttachInfo.mTmpInvalRect; 4734 getDrawingRect(bounds); 4735 info.setBoundsInParent(bounds); 4736 4737 getBoundsOnScreen(bounds); 4738 info.setBoundsInScreen(bounds); 4739 4740 ViewParent parent = getParentForAccessibility(); 4741 if (parent instanceof View) { 4742 info.setParent((View) parent); 4743 } 4744 4745 info.setVisibleToUser(isVisibleToUser()); 4746 4747 info.setPackageName(mContext.getPackageName()); 4748 info.setClassName(View.class.getName()); 4749 info.setContentDescription(getContentDescription()); 4750 4751 info.setEnabled(isEnabled()); 4752 info.setClickable(isClickable()); 4753 info.setFocusable(isFocusable()); 4754 info.setFocused(isFocused()); 4755 info.setAccessibilityFocused(isAccessibilityFocused()); 4756 info.setSelected(isSelected()); 4757 info.setLongClickable(isLongClickable()); 4758 4759 // TODO: These make sense only if we are in an AdapterView but all 4760 // views can be selected. Maybe from accessiiblity perspective 4761 // we should report as selectable view in an AdapterView. 4762 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4763 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4764 4765 if (isFocusable()) { 4766 if (isFocused()) { 4767 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4768 } else { 4769 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4770 } 4771 } 4772 4773 if (!isAccessibilityFocused()) { 4774 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4775 } else { 4776 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4777 } 4778 4779 if (isClickable() && isEnabled()) { 4780 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4781 } 4782 4783 if (isLongClickable() && isEnabled()) { 4784 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4785 } 4786 4787 if (mContentDescription != null && mContentDescription.length() > 0) { 4788 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4789 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4790 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4791 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4792 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4793 } 4794 } 4795 4796 /** 4797 * Computes whether this view is visible to the user. Such a view is 4798 * attached, visible, all its predecessors are visible, it is not clipped 4799 * entirely by its predecessors, and has an alpha greater than zero. 4800 * 4801 * @return Whether the view is visible on the screen. 4802 * 4803 * @hide 4804 */ 4805 protected boolean isVisibleToUser() { 4806 return isVisibleToUser(null); 4807 } 4808 4809 /** 4810 * Computes whether the given portion of this view is visible to the user. Such a view is 4811 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4812 * the specified portion is not clipped entirely by its predecessors. 4813 * 4814 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4815 * <code>null</code>, and the entire view will be tested in this case. 4816 * When <code>true</code> is returned by the function, the actual visible 4817 * region will be stored in this parameter; that is, if boundInView is fully 4818 * contained within the view, no modification will be made, otherwise regions 4819 * outside of the visible area of the view will be clipped. 4820 * 4821 * @return Whether the specified portion of the view is visible on the screen. 4822 * 4823 * @hide 4824 */ 4825 protected boolean isVisibleToUser(Rect boundInView) { 4826 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4827 Point offset = mAttachInfo.mPoint; 4828 // The first two checks are made also made by isShown() which 4829 // however traverses the tree up to the parent to catch that. 4830 // Therefore, we do some fail fast check to minimize the up 4831 // tree traversal. 4832 boolean isVisible = mAttachInfo != null 4833 && mAttachInfo.mWindowVisibility == View.VISIBLE 4834 && getAlpha() > 0 4835 && isShown() 4836 && getGlobalVisibleRect(visibleRect, offset); 4837 if (isVisible && boundInView != null) { 4838 visibleRect.offset(-offset.x, -offset.y); 4839 isVisible &= boundInView.intersect(visibleRect); 4840 } 4841 return isVisible; 4842 } 4843 4844 /** 4845 * Sets a delegate for implementing accessibility support via compositon as 4846 * opposed to inheritance. The delegate's primary use is for implementing 4847 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4848 * 4849 * @param delegate The delegate instance. 4850 * 4851 * @see AccessibilityDelegate 4852 */ 4853 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4854 mAccessibilityDelegate = delegate; 4855 } 4856 4857 /** 4858 * Gets the provider for managing a virtual view hierarchy rooted at this View 4859 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4860 * that explore the window content. 4861 * <p> 4862 * If this method returns an instance, this instance is responsible for managing 4863 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4864 * View including the one representing the View itself. Similarly the returned 4865 * instance is responsible for performing accessibility actions on any virtual 4866 * view or the root view itself. 4867 * </p> 4868 * <p> 4869 * If an {@link AccessibilityDelegate} has been specified via calling 4870 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4871 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4872 * is responsible for handling this call. 4873 * </p> 4874 * 4875 * @return The provider. 4876 * 4877 * @see AccessibilityNodeProvider 4878 */ 4879 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4880 if (mAccessibilityDelegate != null) { 4881 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4882 } else { 4883 return null; 4884 } 4885 } 4886 4887 /** 4888 * Gets the unique identifier of this view on the screen for accessibility purposes. 4889 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4890 * 4891 * @return The view accessibility id. 4892 * 4893 * @hide 4894 */ 4895 public int getAccessibilityViewId() { 4896 if (mAccessibilityViewId == NO_ID) { 4897 mAccessibilityViewId = sNextAccessibilityViewId++; 4898 } 4899 return mAccessibilityViewId; 4900 } 4901 4902 /** 4903 * Gets the unique identifier of the window in which this View reseides. 4904 * 4905 * @return The window accessibility id. 4906 * 4907 * @hide 4908 */ 4909 public int getAccessibilityWindowId() { 4910 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4911 } 4912 4913 /** 4914 * Gets the {@link View} description. It briefly describes the view and is 4915 * primarily used for accessibility support. Set this property to enable 4916 * better accessibility support for your application. This is especially 4917 * true for views that do not have textual representation (For example, 4918 * ImageButton). 4919 * 4920 * @return The content description. 4921 * 4922 * @attr ref android.R.styleable#View_contentDescription 4923 */ 4924 @ViewDebug.ExportedProperty(category = "accessibility") 4925 public CharSequence getContentDescription() { 4926 return mContentDescription; 4927 } 4928 4929 /** 4930 * Sets the {@link View} description. It briefly describes the view and is 4931 * primarily used for accessibility support. Set this property to enable 4932 * better accessibility support for your application. This is especially 4933 * true for views that do not have textual representation (For example, 4934 * ImageButton). 4935 * 4936 * @param contentDescription The content description. 4937 * 4938 * @attr ref android.R.styleable#View_contentDescription 4939 */ 4940 @RemotableViewMethod 4941 public void setContentDescription(CharSequence contentDescription) { 4942 mContentDescription = contentDescription; 4943 } 4944 4945 /** 4946 * Invoked whenever this view loses focus, either by losing window focus or by losing 4947 * focus within its window. This method can be used to clear any state tied to the 4948 * focus. For instance, if a button is held pressed with the trackball and the window 4949 * loses focus, this method can be used to cancel the press. 4950 * 4951 * Subclasses of View overriding this method should always call super.onFocusLost(). 4952 * 4953 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4954 * @see #onWindowFocusChanged(boolean) 4955 * 4956 * @hide pending API council approval 4957 */ 4958 protected void onFocusLost() { 4959 resetPressedState(); 4960 } 4961 4962 private void resetPressedState() { 4963 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4964 return; 4965 } 4966 4967 if (isPressed()) { 4968 setPressed(false); 4969 4970 if (!mHasPerformedLongPress) { 4971 removeLongPressCallback(); 4972 } 4973 } 4974 } 4975 4976 /** 4977 * Returns true if this view has focus 4978 * 4979 * @return True if this view has focus, false otherwise. 4980 */ 4981 @ViewDebug.ExportedProperty(category = "focus") 4982 public boolean isFocused() { 4983 return (mPrivateFlags & FOCUSED) != 0; 4984 } 4985 4986 /** 4987 * Find the view in the hierarchy rooted at this view that currently has 4988 * focus. 4989 * 4990 * @return The view that currently has focus, or null if no focused view can 4991 * be found. 4992 */ 4993 public View findFocus() { 4994 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4995 } 4996 4997 /** 4998 * Indicates whether this view is one of the set of scrollable containers in 4999 * its window. 5000 * 5001 * @return whether this view is one of the set of scrollable containers in 5002 * its window 5003 * 5004 * @attr ref android.R.styleable#View_isScrollContainer 5005 */ 5006 public boolean isScrollContainer() { 5007 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5008 } 5009 5010 /** 5011 * Change whether this view is one of the set of scrollable containers in 5012 * its window. This will be used to determine whether the window can 5013 * resize or must pan when a soft input area is open -- scrollable 5014 * containers allow the window to use resize mode since the container 5015 * will appropriately shrink. 5016 * 5017 * @attr ref android.R.styleable#View_isScrollContainer 5018 */ 5019 public void setScrollContainer(boolean isScrollContainer) { 5020 if (isScrollContainer) { 5021 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5022 mAttachInfo.mScrollContainers.add(this); 5023 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5024 } 5025 mPrivateFlags |= SCROLL_CONTAINER; 5026 } else { 5027 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5028 mAttachInfo.mScrollContainers.remove(this); 5029 } 5030 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5031 } 5032 } 5033 5034 /** 5035 * Returns the quality of the drawing cache. 5036 * 5037 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5038 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5039 * 5040 * @see #setDrawingCacheQuality(int) 5041 * @see #setDrawingCacheEnabled(boolean) 5042 * @see #isDrawingCacheEnabled() 5043 * 5044 * @attr ref android.R.styleable#View_drawingCacheQuality 5045 */ 5046 public int getDrawingCacheQuality() { 5047 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5048 } 5049 5050 /** 5051 * Set the drawing cache quality of this view. This value is used only when the 5052 * drawing cache is enabled 5053 * 5054 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5055 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5056 * 5057 * @see #getDrawingCacheQuality() 5058 * @see #setDrawingCacheEnabled(boolean) 5059 * @see #isDrawingCacheEnabled() 5060 * 5061 * @attr ref android.R.styleable#View_drawingCacheQuality 5062 */ 5063 public void setDrawingCacheQuality(int quality) { 5064 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5065 } 5066 5067 /** 5068 * Returns whether the screen should remain on, corresponding to the current 5069 * value of {@link #KEEP_SCREEN_ON}. 5070 * 5071 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5072 * 5073 * @see #setKeepScreenOn(boolean) 5074 * 5075 * @attr ref android.R.styleable#View_keepScreenOn 5076 */ 5077 public boolean getKeepScreenOn() { 5078 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5079 } 5080 5081 /** 5082 * Controls whether the screen should remain on, modifying the 5083 * value of {@link #KEEP_SCREEN_ON}. 5084 * 5085 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5086 * 5087 * @see #getKeepScreenOn() 5088 * 5089 * @attr ref android.R.styleable#View_keepScreenOn 5090 */ 5091 public void setKeepScreenOn(boolean keepScreenOn) { 5092 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5093 } 5094 5095 /** 5096 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5097 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5098 * 5099 * @attr ref android.R.styleable#View_nextFocusLeft 5100 */ 5101 public int getNextFocusLeftId() { 5102 return mNextFocusLeftId; 5103 } 5104 5105 /** 5106 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5107 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5108 * decide automatically. 5109 * 5110 * @attr ref android.R.styleable#View_nextFocusLeft 5111 */ 5112 public void setNextFocusLeftId(int nextFocusLeftId) { 5113 mNextFocusLeftId = nextFocusLeftId; 5114 } 5115 5116 /** 5117 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5118 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5119 * 5120 * @attr ref android.R.styleable#View_nextFocusRight 5121 */ 5122 public int getNextFocusRightId() { 5123 return mNextFocusRightId; 5124 } 5125 5126 /** 5127 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5128 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5129 * decide automatically. 5130 * 5131 * @attr ref android.R.styleable#View_nextFocusRight 5132 */ 5133 public void setNextFocusRightId(int nextFocusRightId) { 5134 mNextFocusRightId = nextFocusRightId; 5135 } 5136 5137 /** 5138 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5139 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5140 * 5141 * @attr ref android.R.styleable#View_nextFocusUp 5142 */ 5143 public int getNextFocusUpId() { 5144 return mNextFocusUpId; 5145 } 5146 5147 /** 5148 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5149 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5150 * decide automatically. 5151 * 5152 * @attr ref android.R.styleable#View_nextFocusUp 5153 */ 5154 public void setNextFocusUpId(int nextFocusUpId) { 5155 mNextFocusUpId = nextFocusUpId; 5156 } 5157 5158 /** 5159 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5160 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5161 * 5162 * @attr ref android.R.styleable#View_nextFocusDown 5163 */ 5164 public int getNextFocusDownId() { 5165 return mNextFocusDownId; 5166 } 5167 5168 /** 5169 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5170 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5171 * decide automatically. 5172 * 5173 * @attr ref android.R.styleable#View_nextFocusDown 5174 */ 5175 public void setNextFocusDownId(int nextFocusDownId) { 5176 mNextFocusDownId = nextFocusDownId; 5177 } 5178 5179 /** 5180 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5181 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5182 * 5183 * @attr ref android.R.styleable#View_nextFocusForward 5184 */ 5185 public int getNextFocusForwardId() { 5186 return mNextFocusForwardId; 5187 } 5188 5189 /** 5190 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5191 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5192 * decide automatically. 5193 * 5194 * @attr ref android.R.styleable#View_nextFocusForward 5195 */ 5196 public void setNextFocusForwardId(int nextFocusForwardId) { 5197 mNextFocusForwardId = nextFocusForwardId; 5198 } 5199 5200 /** 5201 * Returns the visibility of this view and all of its ancestors 5202 * 5203 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5204 */ 5205 public boolean isShown() { 5206 View current = this; 5207 //noinspection ConstantConditions 5208 do { 5209 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5210 return false; 5211 } 5212 ViewParent parent = current.mParent; 5213 if (parent == null) { 5214 return false; // We are not attached to the view root 5215 } 5216 if (!(parent instanceof View)) { 5217 return true; 5218 } 5219 current = (View) parent; 5220 } while (current != null); 5221 5222 return false; 5223 } 5224 5225 /** 5226 * Called by the view hierarchy when the content insets for a window have 5227 * changed, to allow it to adjust its content to fit within those windows. 5228 * The content insets tell you the space that the status bar, input method, 5229 * and other system windows infringe on the application's window. 5230 * 5231 * <p>You do not normally need to deal with this function, since the default 5232 * window decoration given to applications takes care of applying it to the 5233 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5234 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5235 * and your content can be placed under those system elements. You can then 5236 * use this method within your view hierarchy if you have parts of your UI 5237 * which you would like to ensure are not being covered. 5238 * 5239 * <p>The default implementation of this method simply applies the content 5240 * inset's to the view's padding. This can be enabled through 5241 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5242 * the method and handle the insets however you would like. Note that the 5243 * insets provided by the framework are always relative to the far edges 5244 * of the window, not accounting for the location of the called view within 5245 * that window. (In fact when this method is called you do not yet know 5246 * where the layout will place the view, as it is done before layout happens.) 5247 * 5248 * <p>Note: unlike many View methods, there is no dispatch phase to this 5249 * call. If you are overriding it in a ViewGroup and want to allow the 5250 * call to continue to your children, you must be sure to call the super 5251 * implementation. 5252 * 5253 * <p>Here is a sample layout that makes use of fitting system windows 5254 * to have controls for a video view placed inside of the window decorations 5255 * that it hides and shows. This can be used with code like the second 5256 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5257 * 5258 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5259 * 5260 * @param insets Current content insets of the window. Prior to 5261 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5262 * the insets or else you and Android will be unhappy. 5263 * 5264 * @return Return true if this view applied the insets and it should not 5265 * continue propagating further down the hierarchy, false otherwise. 5266 */ 5267 protected boolean fitSystemWindows(Rect insets) { 5268 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5269 mUserPaddingStart = -1; 5270 mUserPaddingEnd = -1; 5271 mUserPaddingRelative = false; 5272 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5273 || mAttachInfo == null 5274 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5275 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5276 return true; 5277 } else { 5278 internalSetPadding(0, 0, 0, 0); 5279 return false; 5280 } 5281 } 5282 return false; 5283 } 5284 5285 /** 5286 * Set whether or not this view should account for system screen decorations 5287 * such as the status bar and inset its content. This allows this view to be 5288 * positioned in absolute screen coordinates and remain visible to the user. 5289 * 5290 * <p>This should only be used by top-level window decor views. 5291 * 5292 * @param fitSystemWindows true to inset content for system screen decorations, false for 5293 * default behavior. 5294 * 5295 * @attr ref android.R.styleable#View_fitsSystemWindows 5296 */ 5297 public void setFitsSystemWindows(boolean fitSystemWindows) { 5298 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5299 } 5300 5301 /** 5302 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5303 * returns true, this view 5304 * will account for system screen decorations such as the status bar and inset its 5305 * content. This allows the view to be positioned in absolute screen coordinates 5306 * and remain visible to the user. 5307 * 5308 * @return true if this view will adjust its content bounds for system screen decorations. 5309 * 5310 * @attr ref android.R.styleable#View_fitsSystemWindows 5311 */ 5312 public boolean getFitsSystemWindows() { 5313 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5314 } 5315 5316 /** @hide */ 5317 public boolean fitsSystemWindows() { 5318 return getFitsSystemWindows(); 5319 } 5320 5321 /** 5322 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5323 */ 5324 public void requestFitSystemWindows() { 5325 if (mParent != null) { 5326 mParent.requestFitSystemWindows(); 5327 } 5328 } 5329 5330 /** 5331 * For use by PhoneWindow to make its own system window fitting optional. 5332 * @hide 5333 */ 5334 public void makeOptionalFitsSystemWindows() { 5335 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5336 } 5337 5338 /** 5339 * Returns the visibility status for this view. 5340 * 5341 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5342 * @attr ref android.R.styleable#View_visibility 5343 */ 5344 @ViewDebug.ExportedProperty(mapping = { 5345 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5346 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5347 @ViewDebug.IntToString(from = GONE, to = "GONE") 5348 }) 5349 public int getVisibility() { 5350 return mViewFlags & VISIBILITY_MASK; 5351 } 5352 5353 /** 5354 * Set the enabled state of this view. 5355 * 5356 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5357 * @attr ref android.R.styleable#View_visibility 5358 */ 5359 @RemotableViewMethod 5360 public void setVisibility(int visibility) { 5361 setFlags(visibility, VISIBILITY_MASK); 5362 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5363 } 5364 5365 /** 5366 * Returns the enabled status for this view. The interpretation of the 5367 * enabled state varies by subclass. 5368 * 5369 * @return True if this view is enabled, false otherwise. 5370 */ 5371 @ViewDebug.ExportedProperty 5372 public boolean isEnabled() { 5373 return (mViewFlags & ENABLED_MASK) == ENABLED; 5374 } 5375 5376 /** 5377 * Set the enabled state of this view. The interpretation of the enabled 5378 * state varies by subclass. 5379 * 5380 * @param enabled True if this view is enabled, false otherwise. 5381 */ 5382 @RemotableViewMethod 5383 public void setEnabled(boolean enabled) { 5384 if (enabled == isEnabled()) return; 5385 5386 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5387 5388 /* 5389 * The View most likely has to change its appearance, so refresh 5390 * the drawable state. 5391 */ 5392 refreshDrawableState(); 5393 5394 // Invalidate too, since the default behavior for views is to be 5395 // be drawn at 50% alpha rather than to change the drawable. 5396 invalidate(true); 5397 } 5398 5399 /** 5400 * Set whether this view can receive the focus. 5401 * 5402 * Setting this to false will also ensure that this view is not focusable 5403 * in touch mode. 5404 * 5405 * @param focusable If true, this view can receive the focus. 5406 * 5407 * @see #setFocusableInTouchMode(boolean) 5408 * @attr ref android.R.styleable#View_focusable 5409 */ 5410 public void setFocusable(boolean focusable) { 5411 if (!focusable) { 5412 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5413 } 5414 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5415 } 5416 5417 /** 5418 * Set whether this view can receive focus while in touch mode. 5419 * 5420 * Setting this to true will also ensure that this view is focusable. 5421 * 5422 * @param focusableInTouchMode If true, this view can receive the focus while 5423 * in touch mode. 5424 * 5425 * @see #setFocusable(boolean) 5426 * @attr ref android.R.styleable#View_focusableInTouchMode 5427 */ 5428 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5429 // Focusable in touch mode should always be set before the focusable flag 5430 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5431 // which, in touch mode, will not successfully request focus on this view 5432 // because the focusable in touch mode flag is not set 5433 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5434 if (focusableInTouchMode) { 5435 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5436 } 5437 } 5438 5439 /** 5440 * Set whether this view should have sound effects enabled for events such as 5441 * clicking and touching. 5442 * 5443 * <p>You may wish to disable sound effects for a view if you already play sounds, 5444 * for instance, a dial key that plays dtmf tones. 5445 * 5446 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5447 * @see #isSoundEffectsEnabled() 5448 * @see #playSoundEffect(int) 5449 * @attr ref android.R.styleable#View_soundEffectsEnabled 5450 */ 5451 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5452 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5453 } 5454 5455 /** 5456 * @return whether this view should have sound effects enabled for events such as 5457 * clicking and touching. 5458 * 5459 * @see #setSoundEffectsEnabled(boolean) 5460 * @see #playSoundEffect(int) 5461 * @attr ref android.R.styleable#View_soundEffectsEnabled 5462 */ 5463 @ViewDebug.ExportedProperty 5464 public boolean isSoundEffectsEnabled() { 5465 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5466 } 5467 5468 /** 5469 * Set whether this view should have haptic feedback for events such as 5470 * long presses. 5471 * 5472 * <p>You may wish to disable haptic feedback if your view already controls 5473 * its own haptic feedback. 5474 * 5475 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5476 * @see #isHapticFeedbackEnabled() 5477 * @see #performHapticFeedback(int) 5478 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5479 */ 5480 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5481 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5482 } 5483 5484 /** 5485 * @return whether this view should have haptic feedback enabled for events 5486 * long presses. 5487 * 5488 * @see #setHapticFeedbackEnabled(boolean) 5489 * @see #performHapticFeedback(int) 5490 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5491 */ 5492 @ViewDebug.ExportedProperty 5493 public boolean isHapticFeedbackEnabled() { 5494 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5495 } 5496 5497 /** 5498 * Returns the layout direction for this view. 5499 * 5500 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5501 * {@link #LAYOUT_DIRECTION_RTL}, 5502 * {@link #LAYOUT_DIRECTION_INHERIT} or 5503 * {@link #LAYOUT_DIRECTION_LOCALE}. 5504 * 5505 * @attr ref android.R.styleable#View_layoutDirection 5506 * @hide 5507 */ 5508 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5509 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5510 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5511 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5512 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5513 }) 5514 public int getLayoutDirection() { 5515 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5516 } 5517 5518 /** 5519 * Set the layout direction for this view. This will propagate a reset of layout direction 5520 * resolution to the view's children and resolve layout direction for this view. 5521 * 5522 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5523 * {@link #LAYOUT_DIRECTION_RTL}, 5524 * {@link #LAYOUT_DIRECTION_INHERIT} or 5525 * {@link #LAYOUT_DIRECTION_LOCALE}. 5526 * 5527 * @attr ref android.R.styleable#View_layoutDirection 5528 * @hide 5529 */ 5530 @RemotableViewMethod 5531 public void setLayoutDirection(int layoutDirection) { 5532 if (getLayoutDirection() != layoutDirection) { 5533 // Reset the current layout direction and the resolved one 5534 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5535 resetResolvedLayoutDirection(); 5536 // Set the new layout direction (filtered) and ask for a layout pass 5537 mPrivateFlags2 |= 5538 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5539 requestLayout(); 5540 } 5541 } 5542 5543 /** 5544 * Returns the resolved layout direction for this view. 5545 * 5546 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5547 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5548 * @hide 5549 */ 5550 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5551 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5552 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5553 }) 5554 public int getResolvedLayoutDirection() { 5555 // The layout diretion will be resolved only if needed 5556 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5557 resolveLayoutDirection(); 5558 } 5559 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5560 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5561 } 5562 5563 /** 5564 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5565 * layout attribute and/or the inherited value from the parent 5566 * 5567 * @return true if the layout is right-to-left. 5568 * @hide 5569 */ 5570 @ViewDebug.ExportedProperty(category = "layout") 5571 public boolean isLayoutRtl() { 5572 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5573 } 5574 5575 /** 5576 * Indicates whether the view is currently tracking transient state that the 5577 * app should not need to concern itself with saving and restoring, but that 5578 * the framework should take special note to preserve when possible. 5579 * 5580 * <p>A view with transient state cannot be trivially rebound from an external 5581 * data source, such as an adapter binding item views in a list. This may be 5582 * because the view is performing an animation, tracking user selection 5583 * of content, or similar.</p> 5584 * 5585 * @return true if the view has transient state 5586 */ 5587 @ViewDebug.ExportedProperty(category = "layout") 5588 public boolean hasTransientState() { 5589 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5590 } 5591 5592 /** 5593 * Set whether this view is currently tracking transient state that the 5594 * framework should attempt to preserve when possible. This flag is reference counted, 5595 * so every call to setHasTransientState(true) should be paired with a later call 5596 * to setHasTransientState(false). 5597 * 5598 * <p>A view with transient state cannot be trivially rebound from an external 5599 * data source, such as an adapter binding item views in a list. This may be 5600 * because the view is performing an animation, tracking user selection 5601 * of content, or similar.</p> 5602 * 5603 * @param hasTransientState true if this view has transient state 5604 */ 5605 public void setHasTransientState(boolean hasTransientState) { 5606 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5607 mTransientStateCount - 1; 5608 if (mTransientStateCount < 0) { 5609 mTransientStateCount = 0; 5610 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5611 "unmatched pair of setHasTransientState calls"); 5612 } 5613 if ((hasTransientState && mTransientStateCount == 1) || 5614 (!hasTransientState && mTransientStateCount == 0)) { 5615 // update flag if we've just incremented up from 0 or decremented down to 0 5616 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5617 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5618 if (mParent != null) { 5619 try { 5620 mParent.childHasTransientStateChanged(this, hasTransientState); 5621 } catch (AbstractMethodError e) { 5622 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5623 " does not fully implement ViewParent", e); 5624 } 5625 } 5626 } 5627 } 5628 5629 /** 5630 * If this view doesn't do any drawing on its own, set this flag to 5631 * allow further optimizations. By default, this flag is not set on 5632 * View, but could be set on some View subclasses such as ViewGroup. 5633 * 5634 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5635 * you should clear this flag. 5636 * 5637 * @param willNotDraw whether or not this View draw on its own 5638 */ 5639 public void setWillNotDraw(boolean willNotDraw) { 5640 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5641 } 5642 5643 /** 5644 * Returns whether or not this View draws on its own. 5645 * 5646 * @return true if this view has nothing to draw, false otherwise 5647 */ 5648 @ViewDebug.ExportedProperty(category = "drawing") 5649 public boolean willNotDraw() { 5650 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5651 } 5652 5653 /** 5654 * When a View's drawing cache is enabled, drawing is redirected to an 5655 * offscreen bitmap. Some views, like an ImageView, must be able to 5656 * bypass this mechanism if they already draw a single bitmap, to avoid 5657 * unnecessary usage of the memory. 5658 * 5659 * @param willNotCacheDrawing true if this view does not cache its 5660 * drawing, false otherwise 5661 */ 5662 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5663 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5664 } 5665 5666 /** 5667 * Returns whether or not this View can cache its drawing or not. 5668 * 5669 * @return true if this view does not cache its drawing, false otherwise 5670 */ 5671 @ViewDebug.ExportedProperty(category = "drawing") 5672 public boolean willNotCacheDrawing() { 5673 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5674 } 5675 5676 /** 5677 * Indicates whether this view reacts to click events or not. 5678 * 5679 * @return true if the view is clickable, false otherwise 5680 * 5681 * @see #setClickable(boolean) 5682 * @attr ref android.R.styleable#View_clickable 5683 */ 5684 @ViewDebug.ExportedProperty 5685 public boolean isClickable() { 5686 return (mViewFlags & CLICKABLE) == CLICKABLE; 5687 } 5688 5689 /** 5690 * Enables or disables click events for this view. When a view 5691 * is clickable it will change its state to "pressed" on every click. 5692 * Subclasses should set the view clickable to visually react to 5693 * user's clicks. 5694 * 5695 * @param clickable true to make the view clickable, false otherwise 5696 * 5697 * @see #isClickable() 5698 * @attr ref android.R.styleable#View_clickable 5699 */ 5700 public void setClickable(boolean clickable) { 5701 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5702 } 5703 5704 /** 5705 * Indicates whether this view reacts to long click events or not. 5706 * 5707 * @return true if the view is long clickable, false otherwise 5708 * 5709 * @see #setLongClickable(boolean) 5710 * @attr ref android.R.styleable#View_longClickable 5711 */ 5712 public boolean isLongClickable() { 5713 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5714 } 5715 5716 /** 5717 * Enables or disables long click events for this view. When a view is long 5718 * clickable it reacts to the user holding down the button for a longer 5719 * duration than a tap. This event can either launch the listener or a 5720 * context menu. 5721 * 5722 * @param longClickable true to make the view long clickable, false otherwise 5723 * @see #isLongClickable() 5724 * @attr ref android.R.styleable#View_longClickable 5725 */ 5726 public void setLongClickable(boolean longClickable) { 5727 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5728 } 5729 5730 /** 5731 * Sets the pressed state for this view. 5732 * 5733 * @see #isClickable() 5734 * @see #setClickable(boolean) 5735 * 5736 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5737 * the View's internal state from a previously set "pressed" state. 5738 */ 5739 public void setPressed(boolean pressed) { 5740 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5741 5742 if (pressed) { 5743 mPrivateFlags |= PRESSED; 5744 } else { 5745 mPrivateFlags &= ~PRESSED; 5746 } 5747 5748 if (needsRefresh) { 5749 refreshDrawableState(); 5750 } 5751 dispatchSetPressed(pressed); 5752 } 5753 5754 /** 5755 * Dispatch setPressed to all of this View's children. 5756 * 5757 * @see #setPressed(boolean) 5758 * 5759 * @param pressed The new pressed state 5760 */ 5761 protected void dispatchSetPressed(boolean pressed) { 5762 } 5763 5764 /** 5765 * Indicates whether the view is currently in pressed state. Unless 5766 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5767 * the pressed state. 5768 * 5769 * @see #setPressed(boolean) 5770 * @see #isClickable() 5771 * @see #setClickable(boolean) 5772 * 5773 * @return true if the view is currently pressed, false otherwise 5774 */ 5775 public boolean isPressed() { 5776 return (mPrivateFlags & PRESSED) == PRESSED; 5777 } 5778 5779 /** 5780 * Indicates whether this view will save its state (that is, 5781 * whether its {@link #onSaveInstanceState} method will be called). 5782 * 5783 * @return Returns true if the view state saving is enabled, else false. 5784 * 5785 * @see #setSaveEnabled(boolean) 5786 * @attr ref android.R.styleable#View_saveEnabled 5787 */ 5788 public boolean isSaveEnabled() { 5789 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5790 } 5791 5792 /** 5793 * Controls whether the saving of this view's state is 5794 * enabled (that is, whether its {@link #onSaveInstanceState} method 5795 * will be called). Note that even if freezing is enabled, the 5796 * view still must have an id assigned to it (via {@link #setId(int)}) 5797 * for its state to be saved. This flag can only disable the 5798 * saving of this view; any child views may still have their state saved. 5799 * 5800 * @param enabled Set to false to <em>disable</em> state saving, or true 5801 * (the default) to allow it. 5802 * 5803 * @see #isSaveEnabled() 5804 * @see #setId(int) 5805 * @see #onSaveInstanceState() 5806 * @attr ref android.R.styleable#View_saveEnabled 5807 */ 5808 public void setSaveEnabled(boolean enabled) { 5809 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5810 } 5811 5812 /** 5813 * Gets whether the framework should discard touches when the view's 5814 * window is obscured by another visible window. 5815 * Refer to the {@link View} security documentation for more details. 5816 * 5817 * @return True if touch filtering is enabled. 5818 * 5819 * @see #setFilterTouchesWhenObscured(boolean) 5820 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5821 */ 5822 @ViewDebug.ExportedProperty 5823 public boolean getFilterTouchesWhenObscured() { 5824 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5825 } 5826 5827 /** 5828 * Sets whether the framework should discard touches when the view's 5829 * window is obscured by another visible window. 5830 * Refer to the {@link View} security documentation for more details. 5831 * 5832 * @param enabled True if touch filtering should be enabled. 5833 * 5834 * @see #getFilterTouchesWhenObscured 5835 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5836 */ 5837 public void setFilterTouchesWhenObscured(boolean enabled) { 5838 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5839 FILTER_TOUCHES_WHEN_OBSCURED); 5840 } 5841 5842 /** 5843 * Indicates whether the entire hierarchy under this view will save its 5844 * state when a state saving traversal occurs from its parent. The default 5845 * is true; if false, these views will not be saved unless 5846 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5847 * 5848 * @return Returns true if the view state saving from parent is enabled, else false. 5849 * 5850 * @see #setSaveFromParentEnabled(boolean) 5851 */ 5852 public boolean isSaveFromParentEnabled() { 5853 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5854 } 5855 5856 /** 5857 * Controls whether the entire hierarchy under this view will save its 5858 * state when a state saving traversal occurs from its parent. The default 5859 * is true; if false, these views will not be saved unless 5860 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5861 * 5862 * @param enabled Set to false to <em>disable</em> state saving, or true 5863 * (the default) to allow it. 5864 * 5865 * @see #isSaveFromParentEnabled() 5866 * @see #setId(int) 5867 * @see #onSaveInstanceState() 5868 */ 5869 public void setSaveFromParentEnabled(boolean enabled) { 5870 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5871 } 5872 5873 5874 /** 5875 * Returns whether this View is able to take focus. 5876 * 5877 * @return True if this view can take focus, or false otherwise. 5878 * @attr ref android.R.styleable#View_focusable 5879 */ 5880 @ViewDebug.ExportedProperty(category = "focus") 5881 public final boolean isFocusable() { 5882 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5883 } 5884 5885 /** 5886 * When a view is focusable, it may not want to take focus when in touch mode. 5887 * For example, a button would like focus when the user is navigating via a D-pad 5888 * so that the user can click on it, but once the user starts touching the screen, 5889 * the button shouldn't take focus 5890 * @return Whether the view is focusable in touch mode. 5891 * @attr ref android.R.styleable#View_focusableInTouchMode 5892 */ 5893 @ViewDebug.ExportedProperty 5894 public final boolean isFocusableInTouchMode() { 5895 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5896 } 5897 5898 /** 5899 * Find the nearest view in the specified direction that can take focus. 5900 * This does not actually give focus to that view. 5901 * 5902 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5903 * 5904 * @return The nearest focusable in the specified direction, or null if none 5905 * can be found. 5906 */ 5907 public View focusSearch(int direction) { 5908 if (mParent != null) { 5909 return mParent.focusSearch(this, direction); 5910 } else { 5911 return null; 5912 } 5913 } 5914 5915 /** 5916 * This method is the last chance for the focused view and its ancestors to 5917 * respond to an arrow key. This is called when the focused view did not 5918 * consume the key internally, nor could the view system find a new view in 5919 * the requested direction to give focus to. 5920 * 5921 * @param focused The currently focused view. 5922 * @param direction The direction focus wants to move. One of FOCUS_UP, 5923 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5924 * @return True if the this view consumed this unhandled move. 5925 */ 5926 public boolean dispatchUnhandledMove(View focused, int direction) { 5927 return false; 5928 } 5929 5930 /** 5931 * If a user manually specified the next view id for a particular direction, 5932 * use the root to look up the view. 5933 * @param root The root view of the hierarchy containing this view. 5934 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5935 * or FOCUS_BACKWARD. 5936 * @return The user specified next view, or null if there is none. 5937 */ 5938 View findUserSetNextFocus(View root, int direction) { 5939 switch (direction) { 5940 case FOCUS_LEFT: 5941 if (mNextFocusLeftId == View.NO_ID) return null; 5942 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5943 case FOCUS_RIGHT: 5944 if (mNextFocusRightId == View.NO_ID) return null; 5945 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5946 case FOCUS_UP: 5947 if (mNextFocusUpId == View.NO_ID) return null; 5948 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5949 case FOCUS_DOWN: 5950 if (mNextFocusDownId == View.NO_ID) return null; 5951 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5952 case FOCUS_FORWARD: 5953 if (mNextFocusForwardId == View.NO_ID) return null; 5954 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5955 case FOCUS_BACKWARD: { 5956 if (mID == View.NO_ID) return null; 5957 final int id = mID; 5958 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5959 @Override 5960 public boolean apply(View t) { 5961 return t.mNextFocusForwardId == id; 5962 } 5963 }); 5964 } 5965 } 5966 return null; 5967 } 5968 5969 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5970 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5971 @Override 5972 public boolean apply(View t) { 5973 return t.mID == childViewId; 5974 } 5975 }); 5976 5977 if (result == null) { 5978 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5979 + "by user for id " + childViewId); 5980 } 5981 return result; 5982 } 5983 5984 /** 5985 * Find and return all focusable views that are descendants of this view, 5986 * possibly including this view if it is focusable itself. 5987 * 5988 * @param direction The direction of the focus 5989 * @return A list of focusable views 5990 */ 5991 public ArrayList<View> getFocusables(int direction) { 5992 ArrayList<View> result = new ArrayList<View>(24); 5993 addFocusables(result, direction); 5994 return result; 5995 } 5996 5997 /** 5998 * Add any focusable views that are descendants of this view (possibly 5999 * including this view if it is focusable itself) to views. If we are in touch mode, 6000 * only add views that are also focusable in touch mode. 6001 * 6002 * @param views Focusable views found so far 6003 * @param direction The direction of the focus 6004 */ 6005 public void addFocusables(ArrayList<View> views, int direction) { 6006 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6007 } 6008 6009 /** 6010 * Adds any focusable views that are descendants of this view (possibly 6011 * including this view if it is focusable itself) to views. This method 6012 * adds all focusable views regardless if we are in touch mode or 6013 * only views focusable in touch mode if we are in touch mode or 6014 * only views that can take accessibility focus if accessibility is enabeld 6015 * depending on the focusable mode paramater. 6016 * 6017 * @param views Focusable views found so far or null if all we are interested is 6018 * the number of focusables. 6019 * @param direction The direction of the focus. 6020 * @param focusableMode The type of focusables to be added. 6021 * 6022 * @see #FOCUSABLES_ALL 6023 * @see #FOCUSABLES_TOUCH_MODE 6024 */ 6025 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6026 if (views == null) { 6027 return; 6028 } 6029 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6030 if (canTakeAccessibilityFocusFromHover() || getAccessibilityNodeProvider() != null) { 6031 views.add(this); 6032 return; 6033 } 6034 } 6035 if (!isFocusable()) { 6036 return; 6037 } 6038 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6039 && isInTouchMode() && !isFocusableInTouchMode()) { 6040 return; 6041 } 6042 views.add(this); 6043 } 6044 6045 /** 6046 * Finds the Views that contain given text. The containment is case insensitive. 6047 * The search is performed by either the text that the View renders or the content 6048 * description that describes the view for accessibility purposes and the view does 6049 * not render or both. Clients can specify how the search is to be performed via 6050 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6051 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6052 * 6053 * @param outViews The output list of matching Views. 6054 * @param searched The text to match against. 6055 * 6056 * @see #FIND_VIEWS_WITH_TEXT 6057 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6058 * @see #setContentDescription(CharSequence) 6059 */ 6060 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6061 if (getAccessibilityNodeProvider() != null) { 6062 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6063 outViews.add(this); 6064 } 6065 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6066 && (searched != null && searched.length() > 0) 6067 && (mContentDescription != null && mContentDescription.length() > 0)) { 6068 String searchedLowerCase = searched.toString().toLowerCase(); 6069 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6070 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6071 outViews.add(this); 6072 } 6073 } 6074 } 6075 6076 /** 6077 * Find and return all touchable views that are descendants of this view, 6078 * possibly including this view if it is touchable itself. 6079 * 6080 * @return A list of touchable views 6081 */ 6082 public ArrayList<View> getTouchables() { 6083 ArrayList<View> result = new ArrayList<View>(); 6084 addTouchables(result); 6085 return result; 6086 } 6087 6088 /** 6089 * Add any touchable views that are descendants of this view (possibly 6090 * including this view if it is touchable itself) to views. 6091 * 6092 * @param views Touchable views found so far 6093 */ 6094 public void addTouchables(ArrayList<View> views) { 6095 final int viewFlags = mViewFlags; 6096 6097 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6098 && (viewFlags & ENABLED_MASK) == ENABLED) { 6099 views.add(this); 6100 } 6101 } 6102 6103 /** 6104 * Returns whether this View is accessibility focused. 6105 * 6106 * @return True if this View is accessibility focused. 6107 */ 6108 boolean isAccessibilityFocused() { 6109 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6110 } 6111 6112 /** 6113 * Call this to try to give accessibility focus to this view. 6114 * 6115 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6116 * returns false or the view is no visible or the view already has accessibility 6117 * focus. 6118 * 6119 * See also {@link #focusSearch(int)}, which is what you call to say that you 6120 * have focus, and you want your parent to look for the next one. 6121 * 6122 * @return Whether this view actually took accessibility focus. 6123 * 6124 * @hide 6125 */ 6126 public boolean requestAccessibilityFocus() { 6127 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6128 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6129 return false; 6130 } 6131 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6132 return false; 6133 } 6134 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6135 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6136 ViewRootImpl viewRootImpl = getViewRootImpl(); 6137 if (viewRootImpl != null) { 6138 viewRootImpl.setAccessibilityFocusedHost(this); 6139 } 6140 invalidate(); 6141 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6142 notifyAccessibilityStateChanged(); 6143 // Try to give input focus to this view - not a descendant. 6144 requestFocusNoSearch(View.FOCUS_DOWN, null); 6145 return true; 6146 } 6147 return false; 6148 } 6149 6150 /** 6151 * Call this to try to clear accessibility focus of this view. 6152 * 6153 * See also {@link #focusSearch(int)}, which is what you call to say that you 6154 * have focus, and you want your parent to look for the next one. 6155 * 6156 * @hide 6157 */ 6158 public void clearAccessibilityFocus() { 6159 ViewRootImpl viewRootImpl = getViewRootImpl(); 6160 if (viewRootImpl != null) { 6161 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6162 if (focusHost != null && focusHost != this 6163 && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6164 viewRootImpl.setAccessibilityFocusedHost(null); 6165 } 6166 } 6167 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6168 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6169 invalidate(); 6170 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6171 notifyAccessibilityStateChanged(); 6172 6173 // Clear the text navigation state. 6174 setAccessibilityCursorPosition(-1); 6175 6176 // Try to move accessibility focus to the input focus. 6177 View rootView = getRootView(); 6178 if (rootView != null) { 6179 View inputFocus = rootView.findFocus(); 6180 if (inputFocus != null) { 6181 inputFocus.requestAccessibilityFocus(); 6182 } 6183 } 6184 } 6185 } 6186 6187 private void requestAccessibilityFocusFromHover() { 6188 if (includeForAccessibility() && isActionableForAccessibility()) { 6189 requestAccessibilityFocus(); 6190 } else { 6191 if (mParent != null) { 6192 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6193 if (nextFocus != null) { 6194 nextFocus.requestAccessibilityFocus(); 6195 } 6196 } 6197 } 6198 } 6199 6200 /** 6201 * @hide 6202 */ 6203 public boolean canTakeAccessibilityFocusFromHover() { 6204 if (includeForAccessibility() && isActionableForAccessibility()) { 6205 return true; 6206 } 6207 if (mParent != null) { 6208 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6209 } 6210 return false; 6211 } 6212 6213 /** 6214 * Clears accessibility focus without calling any callback methods 6215 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6216 * is used for clearing accessibility focus when giving this focus to 6217 * another view. 6218 */ 6219 void clearAccessibilityFocusNoCallbacks() { 6220 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6221 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6222 invalidate(); 6223 } 6224 } 6225 6226 /** 6227 * Call this to try to give focus to a specific view or to one of its 6228 * descendants. 6229 * 6230 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6231 * false), or if it is focusable and it is not focusable in touch mode 6232 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6233 * 6234 * See also {@link #focusSearch(int)}, which is what you call to say that you 6235 * have focus, and you want your parent to look for the next one. 6236 * 6237 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6238 * {@link #FOCUS_DOWN} and <code>null</code>. 6239 * 6240 * @return Whether this view or one of its descendants actually took focus. 6241 */ 6242 public final boolean requestFocus() { 6243 return requestFocus(View.FOCUS_DOWN); 6244 } 6245 6246 /** 6247 * Call this to try to give focus to a specific view or to one of its 6248 * descendants and give it a hint about what direction focus is heading. 6249 * 6250 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6251 * false), or if it is focusable and it is not focusable in touch mode 6252 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6253 * 6254 * See also {@link #focusSearch(int)}, which is what you call to say that you 6255 * have focus, and you want your parent to look for the next one. 6256 * 6257 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6258 * <code>null</code> set for the previously focused rectangle. 6259 * 6260 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6261 * @return Whether this view or one of its descendants actually took focus. 6262 */ 6263 public final boolean requestFocus(int direction) { 6264 return requestFocus(direction, null); 6265 } 6266 6267 /** 6268 * Call this to try to give focus to a specific view or to one of its descendants 6269 * and give it hints about the direction and a specific rectangle that the focus 6270 * is coming from. The rectangle can help give larger views a finer grained hint 6271 * about where focus is coming from, and therefore, where to show selection, or 6272 * forward focus change internally. 6273 * 6274 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6275 * false), or if it is focusable and it is not focusable in touch mode 6276 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6277 * 6278 * A View will not take focus if it is not visible. 6279 * 6280 * A View will not take focus if one of its parents has 6281 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6282 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6283 * 6284 * See also {@link #focusSearch(int)}, which is what you call to say that you 6285 * have focus, and you want your parent to look for the next one. 6286 * 6287 * You may wish to override this method if your custom {@link View} has an internal 6288 * {@link View} that it wishes to forward the request to. 6289 * 6290 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6291 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6292 * to give a finer grained hint about where focus is coming from. May be null 6293 * if there is no hint. 6294 * @return Whether this view or one of its descendants actually took focus. 6295 */ 6296 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6297 return requestFocusNoSearch(direction, previouslyFocusedRect); 6298 } 6299 6300 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6301 // need to be focusable 6302 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6303 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6304 return false; 6305 } 6306 6307 // need to be focusable in touch mode if in touch mode 6308 if (isInTouchMode() && 6309 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6310 return false; 6311 } 6312 6313 // need to not have any parents blocking us 6314 if (hasAncestorThatBlocksDescendantFocus()) { 6315 return false; 6316 } 6317 6318 handleFocusGainInternal(direction, previouslyFocusedRect); 6319 return true; 6320 } 6321 6322 /** 6323 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6324 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6325 * touch mode to request focus when they are touched. 6326 * 6327 * @return Whether this view or one of its descendants actually took focus. 6328 * 6329 * @see #isInTouchMode() 6330 * 6331 */ 6332 public final boolean requestFocusFromTouch() { 6333 // Leave touch mode if we need to 6334 if (isInTouchMode()) { 6335 ViewRootImpl viewRoot = getViewRootImpl(); 6336 if (viewRoot != null) { 6337 viewRoot.ensureTouchMode(false); 6338 } 6339 } 6340 return requestFocus(View.FOCUS_DOWN); 6341 } 6342 6343 /** 6344 * @return Whether any ancestor of this view blocks descendant focus. 6345 */ 6346 private boolean hasAncestorThatBlocksDescendantFocus() { 6347 ViewParent ancestor = mParent; 6348 while (ancestor instanceof ViewGroup) { 6349 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6350 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6351 return true; 6352 } else { 6353 ancestor = vgAncestor.getParent(); 6354 } 6355 } 6356 return false; 6357 } 6358 6359 /** 6360 * Gets the mode for determining whether this View is important for accessibility 6361 * which is if it fires accessibility events and if it is reported to 6362 * accessibility services that query the screen. 6363 * 6364 * @return The mode for determining whether a View is important for accessibility. 6365 * 6366 * @attr ref android.R.styleable#View_importantForAccessibility 6367 * 6368 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6369 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6370 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6371 */ 6372 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6373 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6374 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6375 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6376 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6377 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6378 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6379 }) 6380 public int getImportantForAccessibility() { 6381 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6382 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6383 } 6384 6385 /** 6386 * Sets how to determine whether this view is important for accessibility 6387 * which is if it fires accessibility events and if it is reported to 6388 * accessibility services that query the screen. 6389 * 6390 * @param mode How to determine whether this view is important for accessibility. 6391 * 6392 * @attr ref android.R.styleable#View_importantForAccessibility 6393 * 6394 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6395 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6396 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6397 */ 6398 public void setImportantForAccessibility(int mode) { 6399 if (mode != getImportantForAccessibility()) { 6400 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6401 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6402 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6403 notifyAccessibilityStateChanged(); 6404 } 6405 } 6406 6407 /** 6408 * Gets whether this view should be exposed for accessibility. 6409 * 6410 * @return Whether the view is exposed for accessibility. 6411 * 6412 * @hide 6413 */ 6414 public boolean isImportantForAccessibility() { 6415 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6416 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6417 switch (mode) { 6418 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6419 return true; 6420 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6421 return false; 6422 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6423 return isActionableForAccessibility() || hasListenersForAccessibility(); 6424 default: 6425 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6426 + mode); 6427 } 6428 } 6429 6430 /** 6431 * Gets the parent for accessibility purposes. Note that the parent for 6432 * accessibility is not necessary the immediate parent. It is the first 6433 * predecessor that is important for accessibility. 6434 * 6435 * @return The parent for accessibility purposes. 6436 */ 6437 public ViewParent getParentForAccessibility() { 6438 if (mParent instanceof View) { 6439 View parentView = (View) mParent; 6440 if (parentView.includeForAccessibility()) { 6441 return mParent; 6442 } else { 6443 return mParent.getParentForAccessibility(); 6444 } 6445 } 6446 return null; 6447 } 6448 6449 /** 6450 * Adds the children of a given View for accessibility. Since some Views are 6451 * not important for accessibility the children for accessibility are not 6452 * necessarily direct children of the riew, rather they are the first level of 6453 * descendants important for accessibility. 6454 * 6455 * @param children The list of children for accessibility. 6456 */ 6457 public void addChildrenForAccessibility(ArrayList<View> children) { 6458 if (includeForAccessibility()) { 6459 children.add(this); 6460 } 6461 } 6462 6463 /** 6464 * Whether to regard this view for accessibility. A view is regarded for 6465 * accessibility if it is important for accessibility or the querying 6466 * accessibility service has explicitly requested that view not 6467 * important for accessibility are regarded. 6468 * 6469 * @return Whether to regard the view for accessibility. 6470 * 6471 * @hide 6472 */ 6473 public boolean includeForAccessibility() { 6474 if (mAttachInfo != null) { 6475 if (!mAttachInfo.mIncludeNotImportantViews) { 6476 return isImportantForAccessibility(); 6477 } 6478 return true; 6479 } 6480 return false; 6481 } 6482 6483 /** 6484 * Returns whether the View is considered actionable from 6485 * accessibility perspective. Such view are important for 6486 * accessiiblity. 6487 * 6488 * @return True if the view is actionable for accessibility. 6489 * 6490 * @hide 6491 */ 6492 public boolean isActionableForAccessibility() { 6493 return (isClickable() || isLongClickable() || isFocusable()); 6494 } 6495 6496 /** 6497 * Returns whether the View has registered callbacks wich makes it 6498 * important for accessiiblity. 6499 * 6500 * @return True if the view is actionable for accessibility. 6501 */ 6502 private boolean hasListenersForAccessibility() { 6503 ListenerInfo info = getListenerInfo(); 6504 return mTouchDelegate != null || info.mOnKeyListener != null 6505 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6506 || info.mOnHoverListener != null || info.mOnDragListener != null; 6507 } 6508 6509 /** 6510 * Notifies accessibility services that some view's important for 6511 * accessibility state has changed. Note that such notifications 6512 * are made at most once every 6513 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6514 * to avoid unnecessary load to the system. Also once a view has 6515 * made a notifucation this method is a NOP until the notification has 6516 * been sent to clients. 6517 * 6518 * @hide 6519 * 6520 * TODO: Makse sure this method is called for any view state change 6521 * that is interesting for accessilility purposes. 6522 */ 6523 public void notifyAccessibilityStateChanged() { 6524 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6525 return; 6526 } 6527 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6528 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6529 if (mParent != null) { 6530 mParent.childAccessibilityStateChanged(this); 6531 } 6532 } 6533 } 6534 6535 /** 6536 * Reset the state indicating the this view has requested clients 6537 * interested in its accessiblity state to be notified. 6538 * 6539 * @hide 6540 */ 6541 public void resetAccessibilityStateChanged() { 6542 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6543 } 6544 6545 /** 6546 * Performs the specified accessibility action on the view. For 6547 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6548 * <p> 6549 * If an {@link AccessibilityDelegate} has been specified via calling 6550 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6551 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6552 * is responsible for handling this call. 6553 * </p> 6554 * 6555 * @param action The action to perform. 6556 * @param arguments Optional action arguments. 6557 * @return Whether the action was performed. 6558 */ 6559 public boolean performAccessibilityAction(int action, Bundle arguments) { 6560 if (mAccessibilityDelegate != null) { 6561 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6562 } else { 6563 return performAccessibilityActionInternal(action, arguments); 6564 } 6565 } 6566 6567 /** 6568 * @see #performAccessibilityAction(int, Bundle) 6569 * 6570 * Note: Called from the default {@link AccessibilityDelegate}. 6571 */ 6572 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6573 switch (action) { 6574 case AccessibilityNodeInfo.ACTION_CLICK: { 6575 if (isClickable()) { 6576 return performClick(); 6577 } 6578 } break; 6579 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6580 if (isLongClickable()) { 6581 return performLongClick(); 6582 } 6583 } break; 6584 case AccessibilityNodeInfo.ACTION_FOCUS: { 6585 if (!hasFocus()) { 6586 // Get out of touch mode since accessibility 6587 // wants to move focus around. 6588 getViewRootImpl().ensureTouchMode(false); 6589 return requestFocus(); 6590 } 6591 } break; 6592 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6593 if (hasFocus()) { 6594 clearFocus(); 6595 return !isFocused(); 6596 } 6597 } break; 6598 case AccessibilityNodeInfo.ACTION_SELECT: { 6599 if (!isSelected()) { 6600 setSelected(true); 6601 return isSelected(); 6602 } 6603 } break; 6604 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6605 if (isSelected()) { 6606 setSelected(false); 6607 return !isSelected(); 6608 } 6609 } break; 6610 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6611 if (!isAccessibilityFocused()) { 6612 return requestAccessibilityFocus(); 6613 } 6614 } break; 6615 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6616 if (isAccessibilityFocused()) { 6617 clearAccessibilityFocus(); 6618 return true; 6619 } 6620 } break; 6621 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6622 if (arguments != null) { 6623 final int granularity = arguments.getInt( 6624 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6625 return nextAtGranularity(granularity); 6626 } 6627 } break; 6628 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6629 if (arguments != null) { 6630 final int granularity = arguments.getInt( 6631 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6632 return previousAtGranularity(granularity); 6633 } 6634 } break; 6635 } 6636 return false; 6637 } 6638 6639 private boolean nextAtGranularity(int granularity) { 6640 CharSequence text = getIterableTextForAccessibility(); 6641 if (text == null || text.length() == 0) { 6642 return false; 6643 } 6644 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6645 if (iterator == null) { 6646 return false; 6647 } 6648 final int current = getAccessibilityCursorPosition(); 6649 final int[] range = iterator.following(current); 6650 if (range == null) { 6651 setAccessibilityCursorPosition(-1); 6652 return false; 6653 } 6654 final int start = range[0]; 6655 final int end = range[1]; 6656 setAccessibilityCursorPosition(start); 6657 sendViewTextTraversedAtGranularityEvent( 6658 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6659 granularity, start, end); 6660 return true; 6661 } 6662 6663 private boolean previousAtGranularity(int granularity) { 6664 CharSequence text = getIterableTextForAccessibility(); 6665 if (text == null || text.length() == 0) { 6666 return false; 6667 } 6668 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6669 if (iterator == null) { 6670 return false; 6671 } 6672 final int selectionStart = getAccessibilityCursorPosition(); 6673 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6674 final int[] range = iterator.preceding(current); 6675 if (range == null) { 6676 setAccessibilityCursorPosition(-1); 6677 return false; 6678 } 6679 final int start = range[0]; 6680 final int end = range[1]; 6681 setAccessibilityCursorPosition(end); 6682 sendViewTextTraversedAtGranularityEvent( 6683 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6684 granularity, start, end); 6685 return true; 6686 } 6687 6688 /** 6689 * Gets the text reported for accessibility purposes. 6690 * 6691 * @return The accessibility text. 6692 * 6693 * @hide 6694 */ 6695 public CharSequence getIterableTextForAccessibility() { 6696 return mContentDescription; 6697 } 6698 6699 /** 6700 * @hide 6701 */ 6702 public int getAccessibilityCursorPosition() { 6703 return mAccessibilityCursorPosition; 6704 } 6705 6706 /** 6707 * @hide 6708 */ 6709 public void setAccessibilityCursorPosition(int position) { 6710 mAccessibilityCursorPosition = position; 6711 } 6712 6713 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6714 int fromIndex, int toIndex) { 6715 if (mParent == null) { 6716 return; 6717 } 6718 AccessibilityEvent event = AccessibilityEvent.obtain( 6719 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6720 onInitializeAccessibilityEvent(event); 6721 onPopulateAccessibilityEvent(event); 6722 event.setFromIndex(fromIndex); 6723 event.setToIndex(toIndex); 6724 event.setAction(action); 6725 event.setMovementGranularity(granularity); 6726 mParent.requestSendAccessibilityEvent(this, event); 6727 } 6728 6729 /** 6730 * @hide 6731 */ 6732 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6733 switch (granularity) { 6734 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6735 CharSequence text = getIterableTextForAccessibility(); 6736 if (text != null && text.length() > 0) { 6737 CharacterTextSegmentIterator iterator = 6738 CharacterTextSegmentIterator.getInstance(mContext); 6739 iterator.initialize(text.toString()); 6740 return iterator; 6741 } 6742 } break; 6743 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6744 CharSequence text = getIterableTextForAccessibility(); 6745 if (text != null && text.length() > 0) { 6746 WordTextSegmentIterator iterator = 6747 WordTextSegmentIterator.getInstance(mContext); 6748 iterator.initialize(text.toString()); 6749 return iterator; 6750 } 6751 } break; 6752 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6753 CharSequence text = getIterableTextForAccessibility(); 6754 if (text != null && text.length() > 0) { 6755 ParagraphTextSegmentIterator iterator = 6756 ParagraphTextSegmentIterator.getInstance(); 6757 iterator.initialize(text.toString()); 6758 return iterator; 6759 } 6760 } break; 6761 } 6762 return null; 6763 } 6764 6765 /** 6766 * @hide 6767 */ 6768 public void dispatchStartTemporaryDetach() { 6769 clearAccessibilityFocus(); 6770 onStartTemporaryDetach(); 6771 } 6772 6773 /** 6774 * This is called when a container is going to temporarily detach a child, with 6775 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6776 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6777 * {@link #onDetachedFromWindow()} when the container is done. 6778 */ 6779 public void onStartTemporaryDetach() { 6780 removeUnsetPressCallback(); 6781 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6782 } 6783 6784 /** 6785 * @hide 6786 */ 6787 public void dispatchFinishTemporaryDetach() { 6788 onFinishTemporaryDetach(); 6789 } 6790 6791 /** 6792 * Called after {@link #onStartTemporaryDetach} when the container is done 6793 * changing the view. 6794 */ 6795 public void onFinishTemporaryDetach() { 6796 } 6797 6798 /** 6799 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6800 * for this view's window. Returns null if the view is not currently attached 6801 * to the window. Normally you will not need to use this directly, but 6802 * just use the standard high-level event callbacks like 6803 * {@link #onKeyDown(int, KeyEvent)}. 6804 */ 6805 public KeyEvent.DispatcherState getKeyDispatcherState() { 6806 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6807 } 6808 6809 /** 6810 * Dispatch a key event before it is processed by any input method 6811 * associated with the view hierarchy. This can be used to intercept 6812 * key events in special situations before the IME consumes them; a 6813 * typical example would be handling the BACK key to update the application's 6814 * UI instead of allowing the IME to see it and close itself. 6815 * 6816 * @param event The key event to be dispatched. 6817 * @return True if the event was handled, false otherwise. 6818 */ 6819 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6820 return onKeyPreIme(event.getKeyCode(), event); 6821 } 6822 6823 /** 6824 * Dispatch a key event to the next view on the focus path. This path runs 6825 * from the top of the view tree down to the currently focused view. If this 6826 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6827 * the next node down the focus path. This method also fires any key 6828 * listeners. 6829 * 6830 * @param event The key event to be dispatched. 6831 * @return True if the event was handled, false otherwise. 6832 */ 6833 public boolean dispatchKeyEvent(KeyEvent event) { 6834 if (mInputEventConsistencyVerifier != null) { 6835 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6836 } 6837 6838 // Give any attached key listener a first crack at the event. 6839 //noinspection SimplifiableIfStatement 6840 ListenerInfo li = mListenerInfo; 6841 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6842 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6843 return true; 6844 } 6845 6846 if (event.dispatch(this, mAttachInfo != null 6847 ? mAttachInfo.mKeyDispatchState : null, this)) { 6848 return true; 6849 } 6850 6851 if (mInputEventConsistencyVerifier != null) { 6852 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6853 } 6854 return false; 6855 } 6856 6857 /** 6858 * Dispatches a key shortcut event. 6859 * 6860 * @param event The key event to be dispatched. 6861 * @return True if the event was handled by the view, false otherwise. 6862 */ 6863 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6864 return onKeyShortcut(event.getKeyCode(), event); 6865 } 6866 6867 /** 6868 * Pass the touch screen motion event down to the target view, or this 6869 * view if it is the target. 6870 * 6871 * @param event The motion event to be dispatched. 6872 * @return True if the event was handled by the view, false otherwise. 6873 */ 6874 public boolean dispatchTouchEvent(MotionEvent event) { 6875 if (mInputEventConsistencyVerifier != null) { 6876 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6877 } 6878 6879 if (onFilterTouchEventForSecurity(event)) { 6880 //noinspection SimplifiableIfStatement 6881 ListenerInfo li = mListenerInfo; 6882 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6883 && li.mOnTouchListener.onTouch(this, event)) { 6884 return true; 6885 } 6886 6887 if (onTouchEvent(event)) { 6888 return true; 6889 } 6890 } 6891 6892 if (mInputEventConsistencyVerifier != null) { 6893 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6894 } 6895 return false; 6896 } 6897 6898 /** 6899 * Filter the touch event to apply security policies. 6900 * 6901 * @param event The motion event to be filtered. 6902 * @return True if the event should be dispatched, false if the event should be dropped. 6903 * 6904 * @see #getFilterTouchesWhenObscured 6905 */ 6906 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6907 //noinspection RedundantIfStatement 6908 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6909 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6910 // Window is obscured, drop this touch. 6911 return false; 6912 } 6913 return true; 6914 } 6915 6916 /** 6917 * Pass a trackball motion event down to the focused view. 6918 * 6919 * @param event The motion event to be dispatched. 6920 * @return True if the event was handled by the view, false otherwise. 6921 */ 6922 public boolean dispatchTrackballEvent(MotionEvent event) { 6923 if (mInputEventConsistencyVerifier != null) { 6924 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6925 } 6926 6927 return onTrackballEvent(event); 6928 } 6929 6930 /** 6931 * Dispatch a generic motion event. 6932 * <p> 6933 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6934 * are delivered to the view under the pointer. All other generic motion events are 6935 * delivered to the focused view. Hover events are handled specially and are delivered 6936 * to {@link #onHoverEvent(MotionEvent)}. 6937 * </p> 6938 * 6939 * @param event The motion event to be dispatched. 6940 * @return True if the event was handled by the view, false otherwise. 6941 */ 6942 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6943 if (mInputEventConsistencyVerifier != null) { 6944 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6945 } 6946 6947 final int source = event.getSource(); 6948 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6949 final int action = event.getAction(); 6950 if (action == MotionEvent.ACTION_HOVER_ENTER 6951 || action == MotionEvent.ACTION_HOVER_MOVE 6952 || action == MotionEvent.ACTION_HOVER_EXIT) { 6953 if (dispatchHoverEvent(event)) { 6954 return true; 6955 } 6956 } else if (dispatchGenericPointerEvent(event)) { 6957 return true; 6958 } 6959 } else if (dispatchGenericFocusedEvent(event)) { 6960 return true; 6961 } 6962 6963 if (dispatchGenericMotionEventInternal(event)) { 6964 return true; 6965 } 6966 6967 if (mInputEventConsistencyVerifier != null) { 6968 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6969 } 6970 return false; 6971 } 6972 6973 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6974 //noinspection SimplifiableIfStatement 6975 ListenerInfo li = mListenerInfo; 6976 if (li != null && li.mOnGenericMotionListener != null 6977 && (mViewFlags & ENABLED_MASK) == ENABLED 6978 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6979 return true; 6980 } 6981 6982 if (onGenericMotionEvent(event)) { 6983 return true; 6984 } 6985 6986 if (mInputEventConsistencyVerifier != null) { 6987 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6988 } 6989 return false; 6990 } 6991 6992 /** 6993 * Dispatch a hover event. 6994 * <p> 6995 * Do not call this method directly. 6996 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6997 * </p> 6998 * 6999 * @param event The motion event to be dispatched. 7000 * @return True if the event was handled by the view, false otherwise. 7001 */ 7002 protected boolean dispatchHoverEvent(MotionEvent event) { 7003 //noinspection SimplifiableIfStatement 7004 ListenerInfo li = mListenerInfo; 7005 if (li != null && li.mOnHoverListener != null 7006 && (mViewFlags & ENABLED_MASK) == ENABLED 7007 && li.mOnHoverListener.onHover(this, event)) { 7008 return true; 7009 } 7010 7011 return onHoverEvent(event); 7012 } 7013 7014 /** 7015 * Returns true if the view has a child to which it has recently sent 7016 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7017 * it does not have a hovered child, then it must be the innermost hovered view. 7018 * @hide 7019 */ 7020 protected boolean hasHoveredChild() { 7021 return false; 7022 } 7023 7024 /** 7025 * Dispatch a generic motion event to the view under the first pointer. 7026 * <p> 7027 * Do not call this method directly. 7028 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7029 * </p> 7030 * 7031 * @param event The motion event to be dispatched. 7032 * @return True if the event was handled by the view, false otherwise. 7033 */ 7034 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7035 return false; 7036 } 7037 7038 /** 7039 * Dispatch a generic motion event to the currently focused view. 7040 * <p> 7041 * Do not call this method directly. 7042 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7043 * </p> 7044 * 7045 * @param event The motion event to be dispatched. 7046 * @return True if the event was handled by the view, false otherwise. 7047 */ 7048 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7049 return false; 7050 } 7051 7052 /** 7053 * Dispatch a pointer event. 7054 * <p> 7055 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7056 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7057 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7058 * and should not be expected to handle other pointing device features. 7059 * </p> 7060 * 7061 * @param event The motion event to be dispatched. 7062 * @return True if the event was handled by the view, false otherwise. 7063 * @hide 7064 */ 7065 public final boolean dispatchPointerEvent(MotionEvent event) { 7066 if (event.isTouchEvent()) { 7067 return dispatchTouchEvent(event); 7068 } else { 7069 return dispatchGenericMotionEvent(event); 7070 } 7071 } 7072 7073 /** 7074 * Called when the window containing this view gains or loses window focus. 7075 * ViewGroups should override to route to their children. 7076 * 7077 * @param hasFocus True if the window containing this view now has focus, 7078 * false otherwise. 7079 */ 7080 public void dispatchWindowFocusChanged(boolean hasFocus) { 7081 onWindowFocusChanged(hasFocus); 7082 } 7083 7084 /** 7085 * Called when the window containing this view gains or loses focus. Note 7086 * that this is separate from view focus: to receive key events, both 7087 * your view and its window must have focus. If a window is displayed 7088 * on top of yours that takes input focus, then your own window will lose 7089 * focus but the view focus will remain unchanged. 7090 * 7091 * @param hasWindowFocus True if the window containing this view now has 7092 * focus, false otherwise. 7093 */ 7094 public void onWindowFocusChanged(boolean hasWindowFocus) { 7095 InputMethodManager imm = InputMethodManager.peekInstance(); 7096 if (!hasWindowFocus) { 7097 if (isPressed()) { 7098 setPressed(false); 7099 } 7100 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7101 imm.focusOut(this); 7102 } 7103 removeLongPressCallback(); 7104 removeTapCallback(); 7105 onFocusLost(); 7106 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7107 imm.focusIn(this); 7108 } 7109 refreshDrawableState(); 7110 } 7111 7112 /** 7113 * Returns true if this view is in a window that currently has window focus. 7114 * Note that this is not the same as the view itself having focus. 7115 * 7116 * @return True if this view is in a window that currently has window focus. 7117 */ 7118 public boolean hasWindowFocus() { 7119 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7120 } 7121 7122 /** 7123 * Dispatch a view visibility change down the view hierarchy. 7124 * ViewGroups should override to route to their children. 7125 * @param changedView The view whose visibility changed. Could be 'this' or 7126 * an ancestor view. 7127 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7128 * {@link #INVISIBLE} or {@link #GONE}. 7129 */ 7130 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7131 onVisibilityChanged(changedView, visibility); 7132 } 7133 7134 /** 7135 * Called when the visibility of the view or an ancestor of the view is changed. 7136 * @param changedView The view whose visibility changed. Could be 'this' or 7137 * an ancestor view. 7138 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7139 * {@link #INVISIBLE} or {@link #GONE}. 7140 */ 7141 protected void onVisibilityChanged(View changedView, int visibility) { 7142 if (visibility == VISIBLE) { 7143 if (mAttachInfo != null) { 7144 initialAwakenScrollBars(); 7145 } else { 7146 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7147 } 7148 } 7149 } 7150 7151 /** 7152 * Dispatch a hint about whether this view is displayed. For instance, when 7153 * a View moves out of the screen, it might receives a display hint indicating 7154 * the view is not displayed. Applications should not <em>rely</em> on this hint 7155 * as there is no guarantee that they will receive one. 7156 * 7157 * @param hint A hint about whether or not this view is displayed: 7158 * {@link #VISIBLE} or {@link #INVISIBLE}. 7159 */ 7160 public void dispatchDisplayHint(int hint) { 7161 onDisplayHint(hint); 7162 } 7163 7164 /** 7165 * Gives this view a hint about whether is displayed or not. For instance, when 7166 * a View moves out of the screen, it might receives a display hint indicating 7167 * the view is not displayed. Applications should not <em>rely</em> on this hint 7168 * as there is no guarantee that they will receive one. 7169 * 7170 * @param hint A hint about whether or not this view is displayed: 7171 * {@link #VISIBLE} or {@link #INVISIBLE}. 7172 */ 7173 protected void onDisplayHint(int hint) { 7174 } 7175 7176 /** 7177 * Dispatch a window visibility change down the view hierarchy. 7178 * ViewGroups should override to route to their children. 7179 * 7180 * @param visibility The new visibility of the window. 7181 * 7182 * @see #onWindowVisibilityChanged(int) 7183 */ 7184 public void dispatchWindowVisibilityChanged(int visibility) { 7185 onWindowVisibilityChanged(visibility); 7186 } 7187 7188 /** 7189 * Called when the window containing has change its visibility 7190 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7191 * that this tells you whether or not your window is being made visible 7192 * to the window manager; this does <em>not</em> tell you whether or not 7193 * your window is obscured by other windows on the screen, even if it 7194 * is itself visible. 7195 * 7196 * @param visibility The new visibility of the window. 7197 */ 7198 protected void onWindowVisibilityChanged(int visibility) { 7199 if (visibility == VISIBLE) { 7200 initialAwakenScrollBars(); 7201 } 7202 } 7203 7204 /** 7205 * Returns the current visibility of the window this view is attached to 7206 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7207 * 7208 * @return Returns the current visibility of the view's window. 7209 */ 7210 public int getWindowVisibility() { 7211 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7212 } 7213 7214 /** 7215 * Retrieve the overall visible display size in which the window this view is 7216 * attached to has been positioned in. This takes into account screen 7217 * decorations above the window, for both cases where the window itself 7218 * is being position inside of them or the window is being placed under 7219 * then and covered insets are used for the window to position its content 7220 * inside. In effect, this tells you the available area where content can 7221 * be placed and remain visible to users. 7222 * 7223 * <p>This function requires an IPC back to the window manager to retrieve 7224 * the requested information, so should not be used in performance critical 7225 * code like drawing. 7226 * 7227 * @param outRect Filled in with the visible display frame. If the view 7228 * is not attached to a window, this is simply the raw display size. 7229 */ 7230 public void getWindowVisibleDisplayFrame(Rect outRect) { 7231 if (mAttachInfo != null) { 7232 try { 7233 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7234 } catch (RemoteException e) { 7235 return; 7236 } 7237 // XXX This is really broken, and probably all needs to be done 7238 // in the window manager, and we need to know more about whether 7239 // we want the area behind or in front of the IME. 7240 final Rect insets = mAttachInfo.mVisibleInsets; 7241 outRect.left += insets.left; 7242 outRect.top += insets.top; 7243 outRect.right -= insets.right; 7244 outRect.bottom -= insets.bottom; 7245 return; 7246 } 7247 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7248 d.getRectSize(outRect); 7249 } 7250 7251 /** 7252 * Dispatch a notification about a resource configuration change down 7253 * the view hierarchy. 7254 * ViewGroups should override to route to their children. 7255 * 7256 * @param newConfig The new resource configuration. 7257 * 7258 * @see #onConfigurationChanged(android.content.res.Configuration) 7259 */ 7260 public void dispatchConfigurationChanged(Configuration newConfig) { 7261 onConfigurationChanged(newConfig); 7262 } 7263 7264 /** 7265 * Called when the current configuration of the resources being used 7266 * by the application have changed. You can use this to decide when 7267 * to reload resources that can changed based on orientation and other 7268 * configuration characterstics. You only need to use this if you are 7269 * not relying on the normal {@link android.app.Activity} mechanism of 7270 * recreating the activity instance upon a configuration change. 7271 * 7272 * @param newConfig The new resource configuration. 7273 */ 7274 protected void onConfigurationChanged(Configuration newConfig) { 7275 } 7276 7277 /** 7278 * Private function to aggregate all per-view attributes in to the view 7279 * root. 7280 */ 7281 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7282 performCollectViewAttributes(attachInfo, visibility); 7283 } 7284 7285 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7286 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7287 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7288 attachInfo.mKeepScreenOn = true; 7289 } 7290 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7291 ListenerInfo li = mListenerInfo; 7292 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7293 attachInfo.mHasSystemUiListeners = true; 7294 } 7295 } 7296 } 7297 7298 void needGlobalAttributesUpdate(boolean force) { 7299 final AttachInfo ai = mAttachInfo; 7300 if (ai != null) { 7301 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7302 || ai.mHasSystemUiListeners) { 7303 ai.mRecomputeGlobalAttributes = true; 7304 } 7305 } 7306 } 7307 7308 /** 7309 * Returns whether the device is currently in touch mode. Touch mode is entered 7310 * once the user begins interacting with the device by touch, and affects various 7311 * things like whether focus is always visible to the user. 7312 * 7313 * @return Whether the device is in touch mode. 7314 */ 7315 @ViewDebug.ExportedProperty 7316 public boolean isInTouchMode() { 7317 if (mAttachInfo != null) { 7318 return mAttachInfo.mInTouchMode; 7319 } else { 7320 return ViewRootImpl.isInTouchMode(); 7321 } 7322 } 7323 7324 /** 7325 * Returns the context the view is running in, through which it can 7326 * access the current theme, resources, etc. 7327 * 7328 * @return The view's Context. 7329 */ 7330 @ViewDebug.CapturedViewProperty 7331 public final Context getContext() { 7332 return mContext; 7333 } 7334 7335 /** 7336 * Handle a key event before it is processed by any input method 7337 * associated with the view hierarchy. This can be used to intercept 7338 * key events in special situations before the IME consumes them; a 7339 * typical example would be handling the BACK key to update the application's 7340 * UI instead of allowing the IME to see it and close itself. 7341 * 7342 * @param keyCode The value in event.getKeyCode(). 7343 * @param event Description of the key event. 7344 * @return If you handled the event, return true. If you want to allow the 7345 * event to be handled by the next receiver, return false. 7346 */ 7347 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7348 return false; 7349 } 7350 7351 /** 7352 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7353 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7354 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7355 * is released, if the view is enabled and clickable. 7356 * 7357 * @param keyCode A key code that represents the button pressed, from 7358 * {@link android.view.KeyEvent}. 7359 * @param event The KeyEvent object that defines the button action. 7360 */ 7361 public boolean onKeyDown(int keyCode, KeyEvent event) { 7362 boolean result = false; 7363 7364 switch (keyCode) { 7365 case KeyEvent.KEYCODE_DPAD_CENTER: 7366 case KeyEvent.KEYCODE_ENTER: { 7367 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7368 return true; 7369 } 7370 // Long clickable items don't necessarily have to be clickable 7371 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7372 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7373 (event.getRepeatCount() == 0)) { 7374 setPressed(true); 7375 checkForLongClick(0); 7376 return true; 7377 } 7378 break; 7379 } 7380 } 7381 return result; 7382 } 7383 7384 /** 7385 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7386 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7387 * the event). 7388 */ 7389 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7390 return false; 7391 } 7392 7393 /** 7394 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7395 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7396 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7397 * {@link KeyEvent#KEYCODE_ENTER} is released. 7398 * 7399 * @param keyCode A key code that represents the button pressed, from 7400 * {@link android.view.KeyEvent}. 7401 * @param event The KeyEvent object that defines the button action. 7402 */ 7403 public boolean onKeyUp(int keyCode, KeyEvent event) { 7404 boolean result = false; 7405 7406 switch (keyCode) { 7407 case KeyEvent.KEYCODE_DPAD_CENTER: 7408 case KeyEvent.KEYCODE_ENTER: { 7409 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7410 return true; 7411 } 7412 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7413 setPressed(false); 7414 7415 if (!mHasPerformedLongPress) { 7416 // This is a tap, so remove the longpress check 7417 removeLongPressCallback(); 7418 7419 result = performClick(); 7420 } 7421 } 7422 break; 7423 } 7424 } 7425 return result; 7426 } 7427 7428 /** 7429 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7430 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7431 * the event). 7432 * 7433 * @param keyCode A key code that represents the button pressed, from 7434 * {@link android.view.KeyEvent}. 7435 * @param repeatCount The number of times the action was made. 7436 * @param event The KeyEvent object that defines the button action. 7437 */ 7438 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7439 return false; 7440 } 7441 7442 /** 7443 * Called on the focused view when a key shortcut event is not handled. 7444 * Override this method to implement local key shortcuts for the View. 7445 * Key shortcuts can also be implemented by setting the 7446 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7447 * 7448 * @param keyCode The value in event.getKeyCode(). 7449 * @param event Description of the key event. 7450 * @return If you handled the event, return true. If you want to allow the 7451 * event to be handled by the next receiver, return false. 7452 */ 7453 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7454 return false; 7455 } 7456 7457 /** 7458 * Check whether the called view is a text editor, in which case it 7459 * would make sense to automatically display a soft input window for 7460 * it. Subclasses should override this if they implement 7461 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7462 * a call on that method would return a non-null InputConnection, and 7463 * they are really a first-class editor that the user would normally 7464 * start typing on when the go into a window containing your view. 7465 * 7466 * <p>The default implementation always returns false. This does 7467 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7468 * will not be called or the user can not otherwise perform edits on your 7469 * view; it is just a hint to the system that this is not the primary 7470 * purpose of this view. 7471 * 7472 * @return Returns true if this view is a text editor, else false. 7473 */ 7474 public boolean onCheckIsTextEditor() { 7475 return false; 7476 } 7477 7478 /** 7479 * Create a new InputConnection for an InputMethod to interact 7480 * with the view. The default implementation returns null, since it doesn't 7481 * support input methods. You can override this to implement such support. 7482 * This is only needed for views that take focus and text input. 7483 * 7484 * <p>When implementing this, you probably also want to implement 7485 * {@link #onCheckIsTextEditor()} to indicate you will return a 7486 * non-null InputConnection. 7487 * 7488 * @param outAttrs Fill in with attribute information about the connection. 7489 */ 7490 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7491 return null; 7492 } 7493 7494 /** 7495 * Called by the {@link android.view.inputmethod.InputMethodManager} 7496 * when a view who is not the current 7497 * input connection target is trying to make a call on the manager. The 7498 * default implementation returns false; you can override this to return 7499 * true for certain views if you are performing InputConnection proxying 7500 * to them. 7501 * @param view The View that is making the InputMethodManager call. 7502 * @return Return true to allow the call, false to reject. 7503 */ 7504 public boolean checkInputConnectionProxy(View view) { 7505 return false; 7506 } 7507 7508 /** 7509 * Show the context menu for this view. It is not safe to hold on to the 7510 * menu after returning from this method. 7511 * 7512 * You should normally not overload this method. Overload 7513 * {@link #onCreateContextMenu(ContextMenu)} or define an 7514 * {@link OnCreateContextMenuListener} to add items to the context menu. 7515 * 7516 * @param menu The context menu to populate 7517 */ 7518 public void createContextMenu(ContextMenu menu) { 7519 ContextMenuInfo menuInfo = getContextMenuInfo(); 7520 7521 // Sets the current menu info so all items added to menu will have 7522 // my extra info set. 7523 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7524 7525 onCreateContextMenu(menu); 7526 ListenerInfo li = mListenerInfo; 7527 if (li != null && li.mOnCreateContextMenuListener != null) { 7528 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7529 } 7530 7531 // Clear the extra information so subsequent items that aren't mine don't 7532 // have my extra info. 7533 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7534 7535 if (mParent != null) { 7536 mParent.createContextMenu(menu); 7537 } 7538 } 7539 7540 /** 7541 * Views should implement this if they have extra information to associate 7542 * with the context menu. The return result is supplied as a parameter to 7543 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7544 * callback. 7545 * 7546 * @return Extra information about the item for which the context menu 7547 * should be shown. This information will vary across different 7548 * subclasses of View. 7549 */ 7550 protected ContextMenuInfo getContextMenuInfo() { 7551 return null; 7552 } 7553 7554 /** 7555 * Views should implement this if the view itself is going to add items to 7556 * the context menu. 7557 * 7558 * @param menu the context menu to populate 7559 */ 7560 protected void onCreateContextMenu(ContextMenu menu) { 7561 } 7562 7563 /** 7564 * Implement this method to handle trackball motion events. The 7565 * <em>relative</em> movement of the trackball since the last event 7566 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7567 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7568 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7569 * they will often be fractional values, representing the more fine-grained 7570 * movement information available from a trackball). 7571 * 7572 * @param event The motion event. 7573 * @return True if the event was handled, false otherwise. 7574 */ 7575 public boolean onTrackballEvent(MotionEvent event) { 7576 return false; 7577 } 7578 7579 /** 7580 * Implement this method to handle generic motion events. 7581 * <p> 7582 * Generic motion events describe joystick movements, mouse hovers, track pad 7583 * touches, scroll wheel movements and other input events. The 7584 * {@link MotionEvent#getSource() source} of the motion event specifies 7585 * the class of input that was received. Implementations of this method 7586 * must examine the bits in the source before processing the event. 7587 * The following code example shows how this is done. 7588 * </p><p> 7589 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7590 * are delivered to the view under the pointer. All other generic motion events are 7591 * delivered to the focused view. 7592 * </p> 7593 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7594 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7595 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7596 * // process the joystick movement... 7597 * return true; 7598 * } 7599 * } 7600 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7601 * switch (event.getAction()) { 7602 * case MotionEvent.ACTION_HOVER_MOVE: 7603 * // process the mouse hover movement... 7604 * return true; 7605 * case MotionEvent.ACTION_SCROLL: 7606 * // process the scroll wheel movement... 7607 * return true; 7608 * } 7609 * } 7610 * return super.onGenericMotionEvent(event); 7611 * }</pre> 7612 * 7613 * @param event The generic motion event being processed. 7614 * @return True if the event was handled, false otherwise. 7615 */ 7616 public boolean onGenericMotionEvent(MotionEvent event) { 7617 return false; 7618 } 7619 7620 /** 7621 * Implement this method to handle hover events. 7622 * <p> 7623 * This method is called whenever a pointer is hovering into, over, or out of the 7624 * bounds of a view and the view is not currently being touched. 7625 * Hover events are represented as pointer events with action 7626 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7627 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7628 * </p> 7629 * <ul> 7630 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7631 * when the pointer enters the bounds of the view.</li> 7632 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7633 * when the pointer has already entered the bounds of the view and has moved.</li> 7634 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7635 * when the pointer has exited the bounds of the view or when the pointer is 7636 * about to go down due to a button click, tap, or similar user action that 7637 * causes the view to be touched.</li> 7638 * </ul> 7639 * <p> 7640 * The view should implement this method to return true to indicate that it is 7641 * handling the hover event, such as by changing its drawable state. 7642 * </p><p> 7643 * The default implementation calls {@link #setHovered} to update the hovered state 7644 * of the view when a hover enter or hover exit event is received, if the view 7645 * is enabled and is clickable. The default implementation also sends hover 7646 * accessibility events. 7647 * </p> 7648 * 7649 * @param event The motion event that describes the hover. 7650 * @return True if the view handled the hover event. 7651 * 7652 * @see #isHovered 7653 * @see #setHovered 7654 * @see #onHoverChanged 7655 */ 7656 public boolean onHoverEvent(MotionEvent event) { 7657 // The root view may receive hover (or touch) events that are outside the bounds of 7658 // the window. This code ensures that we only send accessibility events for 7659 // hovers that are actually within the bounds of the root view. 7660 final int action = event.getActionMasked(); 7661 if (!mSendingHoverAccessibilityEvents) { 7662 if ((action == MotionEvent.ACTION_HOVER_ENTER 7663 || action == MotionEvent.ACTION_HOVER_MOVE) 7664 && !hasHoveredChild() 7665 && pointInView(event.getX(), event.getY())) { 7666 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7667 mSendingHoverAccessibilityEvents = true; 7668 requestAccessibilityFocusFromHover(); 7669 } 7670 } else { 7671 if (action == MotionEvent.ACTION_HOVER_EXIT 7672 || (action == MotionEvent.ACTION_MOVE 7673 && !pointInView(event.getX(), event.getY()))) { 7674 mSendingHoverAccessibilityEvents = false; 7675 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7676 // If the window does not have input focus we take away accessibility 7677 // focus as soon as the user stop hovering over the view. 7678 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7679 getViewRootImpl().setAccessibilityFocusedHost(null); 7680 } 7681 } 7682 } 7683 7684 if (isHoverable()) { 7685 switch (action) { 7686 case MotionEvent.ACTION_HOVER_ENTER: 7687 setHovered(true); 7688 break; 7689 case MotionEvent.ACTION_HOVER_EXIT: 7690 setHovered(false); 7691 break; 7692 } 7693 7694 // Dispatch the event to onGenericMotionEvent before returning true. 7695 // This is to provide compatibility with existing applications that 7696 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7697 // break because of the new default handling for hoverable views 7698 // in onHoverEvent. 7699 // Note that onGenericMotionEvent will be called by default when 7700 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7701 dispatchGenericMotionEventInternal(event); 7702 return true; 7703 } 7704 7705 return false; 7706 } 7707 7708 /** 7709 * Returns true if the view should handle {@link #onHoverEvent} 7710 * by calling {@link #setHovered} to change its hovered state. 7711 * 7712 * @return True if the view is hoverable. 7713 */ 7714 private boolean isHoverable() { 7715 final int viewFlags = mViewFlags; 7716 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7717 return false; 7718 } 7719 7720 return (viewFlags & CLICKABLE) == CLICKABLE 7721 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7722 } 7723 7724 /** 7725 * Returns true if the view is currently hovered. 7726 * 7727 * @return True if the view is currently hovered. 7728 * 7729 * @see #setHovered 7730 * @see #onHoverChanged 7731 */ 7732 @ViewDebug.ExportedProperty 7733 public boolean isHovered() { 7734 return (mPrivateFlags & HOVERED) != 0; 7735 } 7736 7737 /** 7738 * Sets whether the view is currently hovered. 7739 * <p> 7740 * Calling this method also changes the drawable state of the view. This 7741 * enables the view to react to hover by using different drawable resources 7742 * to change its appearance. 7743 * </p><p> 7744 * The {@link #onHoverChanged} method is called when the hovered state changes. 7745 * </p> 7746 * 7747 * @param hovered True if the view is hovered. 7748 * 7749 * @see #isHovered 7750 * @see #onHoverChanged 7751 */ 7752 public void setHovered(boolean hovered) { 7753 if (hovered) { 7754 if ((mPrivateFlags & HOVERED) == 0) { 7755 mPrivateFlags |= HOVERED; 7756 refreshDrawableState(); 7757 onHoverChanged(true); 7758 } 7759 } else { 7760 if ((mPrivateFlags & HOVERED) != 0) { 7761 mPrivateFlags &= ~HOVERED; 7762 refreshDrawableState(); 7763 onHoverChanged(false); 7764 } 7765 } 7766 } 7767 7768 /** 7769 * Implement this method to handle hover state changes. 7770 * <p> 7771 * This method is called whenever the hover state changes as a result of a 7772 * call to {@link #setHovered}. 7773 * </p> 7774 * 7775 * @param hovered The current hover state, as returned by {@link #isHovered}. 7776 * 7777 * @see #isHovered 7778 * @see #setHovered 7779 */ 7780 public void onHoverChanged(boolean hovered) { 7781 } 7782 7783 /** 7784 * Implement this method to handle touch screen motion events. 7785 * 7786 * @param event The motion event. 7787 * @return True if the event was handled, false otherwise. 7788 */ 7789 public boolean onTouchEvent(MotionEvent event) { 7790 final int viewFlags = mViewFlags; 7791 7792 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7793 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7794 setPressed(false); 7795 } 7796 // A disabled view that is clickable still consumes the touch 7797 // events, it just doesn't respond to them. 7798 return (((viewFlags & CLICKABLE) == CLICKABLE || 7799 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7800 } 7801 7802 if (mTouchDelegate != null) { 7803 if (mTouchDelegate.onTouchEvent(event)) { 7804 return true; 7805 } 7806 } 7807 7808 if (((viewFlags & CLICKABLE) == CLICKABLE || 7809 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7810 switch (event.getAction()) { 7811 case MotionEvent.ACTION_UP: 7812 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7813 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7814 // take focus if we don't have it already and we should in 7815 // touch mode. 7816 boolean focusTaken = false; 7817 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7818 focusTaken = requestFocus(); 7819 } 7820 7821 if (prepressed) { 7822 // The button is being released before we actually 7823 // showed it as pressed. Make it show the pressed 7824 // state now (before scheduling the click) to ensure 7825 // the user sees it. 7826 setPressed(true); 7827 } 7828 7829 if (!mHasPerformedLongPress) { 7830 // This is a tap, so remove the longpress check 7831 removeLongPressCallback(); 7832 7833 // Only perform take click actions if we were in the pressed state 7834 if (!focusTaken) { 7835 // Use a Runnable and post this rather than calling 7836 // performClick directly. This lets other visual state 7837 // of the view update before click actions start. 7838 if (mPerformClick == null) { 7839 mPerformClick = new PerformClick(); 7840 } 7841 if (!post(mPerformClick)) { 7842 performClick(); 7843 } 7844 } 7845 } 7846 7847 if (mUnsetPressedState == null) { 7848 mUnsetPressedState = new UnsetPressedState(); 7849 } 7850 7851 if (prepressed) { 7852 postDelayed(mUnsetPressedState, 7853 ViewConfiguration.getPressedStateDuration()); 7854 } else if (!post(mUnsetPressedState)) { 7855 // If the post failed, unpress right now 7856 mUnsetPressedState.run(); 7857 } 7858 removeTapCallback(); 7859 } 7860 break; 7861 7862 case MotionEvent.ACTION_DOWN: 7863 mHasPerformedLongPress = false; 7864 7865 if (performButtonActionOnTouchDown(event)) { 7866 break; 7867 } 7868 7869 // Walk up the hierarchy to determine if we're inside a scrolling container. 7870 boolean isInScrollingContainer = isInScrollingContainer(); 7871 7872 // For views inside a scrolling container, delay the pressed feedback for 7873 // a short period in case this is a scroll. 7874 if (isInScrollingContainer) { 7875 mPrivateFlags |= PREPRESSED; 7876 if (mPendingCheckForTap == null) { 7877 mPendingCheckForTap = new CheckForTap(); 7878 } 7879 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7880 } else { 7881 // Not inside a scrolling container, so show the feedback right away 7882 setPressed(true); 7883 checkForLongClick(0); 7884 } 7885 break; 7886 7887 case MotionEvent.ACTION_CANCEL: 7888 setPressed(false); 7889 removeTapCallback(); 7890 break; 7891 7892 case MotionEvent.ACTION_MOVE: 7893 final int x = (int) event.getX(); 7894 final int y = (int) event.getY(); 7895 7896 // Be lenient about moving outside of buttons 7897 if (!pointInView(x, y, mTouchSlop)) { 7898 // Outside button 7899 removeTapCallback(); 7900 if ((mPrivateFlags & PRESSED) != 0) { 7901 // Remove any future long press/tap checks 7902 removeLongPressCallback(); 7903 7904 setPressed(false); 7905 } 7906 } 7907 break; 7908 } 7909 return true; 7910 } 7911 7912 return false; 7913 } 7914 7915 /** 7916 * @hide 7917 */ 7918 public boolean isInScrollingContainer() { 7919 ViewParent p = getParent(); 7920 while (p != null && p instanceof ViewGroup) { 7921 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7922 return true; 7923 } 7924 p = p.getParent(); 7925 } 7926 return false; 7927 } 7928 7929 /** 7930 * Remove the longpress detection timer. 7931 */ 7932 private void removeLongPressCallback() { 7933 if (mPendingCheckForLongPress != null) { 7934 removeCallbacks(mPendingCheckForLongPress); 7935 } 7936 } 7937 7938 /** 7939 * Remove the pending click action 7940 */ 7941 private void removePerformClickCallback() { 7942 if (mPerformClick != null) { 7943 removeCallbacks(mPerformClick); 7944 } 7945 } 7946 7947 /** 7948 * Remove the prepress detection timer. 7949 */ 7950 private void removeUnsetPressCallback() { 7951 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7952 setPressed(false); 7953 removeCallbacks(mUnsetPressedState); 7954 } 7955 } 7956 7957 /** 7958 * Remove the tap detection timer. 7959 */ 7960 private void removeTapCallback() { 7961 if (mPendingCheckForTap != null) { 7962 mPrivateFlags &= ~PREPRESSED; 7963 removeCallbacks(mPendingCheckForTap); 7964 } 7965 } 7966 7967 /** 7968 * Cancels a pending long press. Your subclass can use this if you 7969 * want the context menu to come up if the user presses and holds 7970 * at the same place, but you don't want it to come up if they press 7971 * and then move around enough to cause scrolling. 7972 */ 7973 public void cancelLongPress() { 7974 removeLongPressCallback(); 7975 7976 /* 7977 * The prepressed state handled by the tap callback is a display 7978 * construct, but the tap callback will post a long press callback 7979 * less its own timeout. Remove it here. 7980 */ 7981 removeTapCallback(); 7982 } 7983 7984 /** 7985 * Remove the pending callback for sending a 7986 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7987 */ 7988 private void removeSendViewScrolledAccessibilityEventCallback() { 7989 if (mSendViewScrolledAccessibilityEvent != null) { 7990 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7991 } 7992 } 7993 7994 /** 7995 * Sets the TouchDelegate for this View. 7996 */ 7997 public void setTouchDelegate(TouchDelegate delegate) { 7998 mTouchDelegate = delegate; 7999 } 8000 8001 /** 8002 * Gets the TouchDelegate for this View. 8003 */ 8004 public TouchDelegate getTouchDelegate() { 8005 return mTouchDelegate; 8006 } 8007 8008 /** 8009 * Set flags controlling behavior of this view. 8010 * 8011 * @param flags Constant indicating the value which should be set 8012 * @param mask Constant indicating the bit range that should be changed 8013 */ 8014 void setFlags(int flags, int mask) { 8015 int old = mViewFlags; 8016 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8017 8018 int changed = mViewFlags ^ old; 8019 if (changed == 0) { 8020 return; 8021 } 8022 int privateFlags = mPrivateFlags; 8023 8024 /* Check if the FOCUSABLE bit has changed */ 8025 if (((changed & FOCUSABLE_MASK) != 0) && 8026 ((privateFlags & HAS_BOUNDS) !=0)) { 8027 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8028 && ((privateFlags & FOCUSED) != 0)) { 8029 /* Give up focus if we are no longer focusable */ 8030 clearFocus(); 8031 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8032 && ((privateFlags & FOCUSED) == 0)) { 8033 /* 8034 * Tell the view system that we are now available to take focus 8035 * if no one else already has it. 8036 */ 8037 if (mParent != null) mParent.focusableViewAvailable(this); 8038 } 8039 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8040 notifyAccessibilityStateChanged(); 8041 } 8042 } 8043 8044 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8045 if ((changed & VISIBILITY_MASK) != 0) { 8046 /* 8047 * If this view is becoming visible, invalidate it in case it changed while 8048 * it was not visible. Marking it drawn ensures that the invalidation will 8049 * go through. 8050 */ 8051 mPrivateFlags |= DRAWN; 8052 invalidate(true); 8053 8054 needGlobalAttributesUpdate(true); 8055 8056 // a view becoming visible is worth notifying the parent 8057 // about in case nothing has focus. even if this specific view 8058 // isn't focusable, it may contain something that is, so let 8059 // the root view try to give this focus if nothing else does. 8060 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8061 mParent.focusableViewAvailable(this); 8062 } 8063 } 8064 } 8065 8066 /* Check if the GONE bit has changed */ 8067 if ((changed & GONE) != 0) { 8068 needGlobalAttributesUpdate(false); 8069 requestLayout(); 8070 8071 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8072 if (hasFocus()) clearFocus(); 8073 clearAccessibilityFocus(); 8074 destroyDrawingCache(); 8075 if (mParent instanceof View) { 8076 // GONE views noop invalidation, so invalidate the parent 8077 ((View) mParent).invalidate(true); 8078 } 8079 // Mark the view drawn to ensure that it gets invalidated properly the next 8080 // time it is visible and gets invalidated 8081 mPrivateFlags |= DRAWN; 8082 } 8083 if (mAttachInfo != null) { 8084 mAttachInfo.mViewVisibilityChanged = true; 8085 } 8086 } 8087 8088 /* Check if the VISIBLE bit has changed */ 8089 if ((changed & INVISIBLE) != 0) { 8090 needGlobalAttributesUpdate(false); 8091 /* 8092 * If this view is becoming invisible, set the DRAWN flag so that 8093 * the next invalidate() will not be skipped. 8094 */ 8095 mPrivateFlags |= DRAWN; 8096 8097 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8098 // root view becoming invisible shouldn't clear focus and accessibility focus 8099 if (getRootView() != this) { 8100 clearFocus(); 8101 clearAccessibilityFocus(); 8102 } 8103 } 8104 if (mAttachInfo != null) { 8105 mAttachInfo.mViewVisibilityChanged = true; 8106 } 8107 } 8108 8109 if ((changed & VISIBILITY_MASK) != 0) { 8110 if (mParent instanceof ViewGroup) { 8111 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8112 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8113 ((View) mParent).invalidate(true); 8114 } else if (mParent != null) { 8115 mParent.invalidateChild(this, null); 8116 } 8117 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8118 } 8119 8120 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8121 destroyDrawingCache(); 8122 } 8123 8124 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8125 destroyDrawingCache(); 8126 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8127 invalidateParentCaches(); 8128 } 8129 8130 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8131 destroyDrawingCache(); 8132 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8133 } 8134 8135 if ((changed & DRAW_MASK) != 0) { 8136 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8137 if (mBackground != null) { 8138 mPrivateFlags &= ~SKIP_DRAW; 8139 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8140 } else { 8141 mPrivateFlags |= SKIP_DRAW; 8142 } 8143 } else { 8144 mPrivateFlags &= ~SKIP_DRAW; 8145 } 8146 requestLayout(); 8147 invalidate(true); 8148 } 8149 8150 if ((changed & KEEP_SCREEN_ON) != 0) { 8151 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8152 mParent.recomputeViewAttributes(this); 8153 } 8154 } 8155 8156 if (AccessibilityManager.getInstance(mContext).isEnabled() 8157 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8158 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8159 notifyAccessibilityStateChanged(); 8160 } 8161 } 8162 8163 /** 8164 * Change the view's z order in the tree, so it's on top of other sibling 8165 * views 8166 */ 8167 public void bringToFront() { 8168 if (mParent != null) { 8169 mParent.bringChildToFront(this); 8170 } 8171 } 8172 8173 /** 8174 * This is called in response to an internal scroll in this view (i.e., the 8175 * view scrolled its own contents). This is typically as a result of 8176 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8177 * called. 8178 * 8179 * @param l Current horizontal scroll origin. 8180 * @param t Current vertical scroll origin. 8181 * @param oldl Previous horizontal scroll origin. 8182 * @param oldt Previous vertical scroll origin. 8183 */ 8184 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8185 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8186 postSendViewScrolledAccessibilityEventCallback(); 8187 } 8188 8189 mBackgroundSizeChanged = true; 8190 8191 final AttachInfo ai = mAttachInfo; 8192 if (ai != null) { 8193 ai.mViewScrollChanged = true; 8194 } 8195 } 8196 8197 /** 8198 * Interface definition for a callback to be invoked when the layout bounds of a view 8199 * changes due to layout processing. 8200 */ 8201 public interface OnLayoutChangeListener { 8202 /** 8203 * Called when the focus state of a view has changed. 8204 * 8205 * @param v The view whose state has changed. 8206 * @param left The new value of the view's left property. 8207 * @param top The new value of the view's top property. 8208 * @param right The new value of the view's right property. 8209 * @param bottom The new value of the view's bottom property. 8210 * @param oldLeft The previous value of the view's left property. 8211 * @param oldTop The previous value of the view's top property. 8212 * @param oldRight The previous value of the view's right property. 8213 * @param oldBottom The previous value of the view's bottom property. 8214 */ 8215 void onLayoutChange(View v, int left, int top, int right, int bottom, 8216 int oldLeft, int oldTop, int oldRight, int oldBottom); 8217 } 8218 8219 /** 8220 * This is called during layout when the size of this view has changed. If 8221 * you were just added to the view hierarchy, you're called with the old 8222 * values of 0. 8223 * 8224 * @param w Current width of this view. 8225 * @param h Current height of this view. 8226 * @param oldw Old width of this view. 8227 * @param oldh Old height of this view. 8228 */ 8229 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8230 } 8231 8232 /** 8233 * Called by draw to draw the child views. This may be overridden 8234 * by derived classes to gain control just before its children are drawn 8235 * (but after its own view has been drawn). 8236 * @param canvas the canvas on which to draw the view 8237 */ 8238 protected void dispatchDraw(Canvas canvas) { 8239 8240 } 8241 8242 /** 8243 * Gets the parent of this view. Note that the parent is a 8244 * ViewParent and not necessarily a View. 8245 * 8246 * @return Parent of this view. 8247 */ 8248 public final ViewParent getParent() { 8249 return mParent; 8250 } 8251 8252 /** 8253 * Set the horizontal scrolled position of your view. This will cause a call to 8254 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8255 * invalidated. 8256 * @param value the x position to scroll to 8257 */ 8258 public void setScrollX(int value) { 8259 scrollTo(value, mScrollY); 8260 } 8261 8262 /** 8263 * Set the vertical scrolled position of your view. This will cause a call to 8264 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8265 * invalidated. 8266 * @param value the y position to scroll to 8267 */ 8268 public void setScrollY(int value) { 8269 scrollTo(mScrollX, value); 8270 } 8271 8272 /** 8273 * Return the scrolled left position of this view. This is the left edge of 8274 * the displayed part of your view. You do not need to draw any pixels 8275 * farther left, since those are outside of the frame of your view on 8276 * screen. 8277 * 8278 * @return The left edge of the displayed part of your view, in pixels. 8279 */ 8280 public final int getScrollX() { 8281 return mScrollX; 8282 } 8283 8284 /** 8285 * Return the scrolled top position of this view. This is the top edge of 8286 * the displayed part of your view. You do not need to draw any pixels above 8287 * it, since those are outside of the frame of your view on screen. 8288 * 8289 * @return The top edge of the displayed part of your view, in pixels. 8290 */ 8291 public final int getScrollY() { 8292 return mScrollY; 8293 } 8294 8295 /** 8296 * Return the width of the your view. 8297 * 8298 * @return The width of your view, in pixels. 8299 */ 8300 @ViewDebug.ExportedProperty(category = "layout") 8301 public final int getWidth() { 8302 return mRight - mLeft; 8303 } 8304 8305 /** 8306 * Return the height of your view. 8307 * 8308 * @return The height of your view, in pixels. 8309 */ 8310 @ViewDebug.ExportedProperty(category = "layout") 8311 public final int getHeight() { 8312 return mBottom - mTop; 8313 } 8314 8315 /** 8316 * Return the visible drawing bounds of your view. Fills in the output 8317 * rectangle with the values from getScrollX(), getScrollY(), 8318 * getWidth(), and getHeight(). 8319 * 8320 * @param outRect The (scrolled) drawing bounds of the view. 8321 */ 8322 public void getDrawingRect(Rect outRect) { 8323 outRect.left = mScrollX; 8324 outRect.top = mScrollY; 8325 outRect.right = mScrollX + (mRight - mLeft); 8326 outRect.bottom = mScrollY + (mBottom - mTop); 8327 } 8328 8329 /** 8330 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8331 * raw width component (that is the result is masked by 8332 * {@link #MEASURED_SIZE_MASK}). 8333 * 8334 * @return The raw measured width of this view. 8335 */ 8336 public final int getMeasuredWidth() { 8337 return mMeasuredWidth & MEASURED_SIZE_MASK; 8338 } 8339 8340 /** 8341 * Return the full width measurement information for this view as computed 8342 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8343 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8344 * This should be used during measurement and layout calculations only. Use 8345 * {@link #getWidth()} to see how wide a view is after layout. 8346 * 8347 * @return The measured width of this view as a bit mask. 8348 */ 8349 public final int getMeasuredWidthAndState() { 8350 return mMeasuredWidth; 8351 } 8352 8353 /** 8354 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8355 * raw width component (that is the result is masked by 8356 * {@link #MEASURED_SIZE_MASK}). 8357 * 8358 * @return The raw measured height of this view. 8359 */ 8360 public final int getMeasuredHeight() { 8361 return mMeasuredHeight & MEASURED_SIZE_MASK; 8362 } 8363 8364 /** 8365 * Return the full height measurement information for this view as computed 8366 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8367 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8368 * This should be used during measurement and layout calculations only. Use 8369 * {@link #getHeight()} to see how wide a view is after layout. 8370 * 8371 * @return The measured width of this view as a bit mask. 8372 */ 8373 public final int getMeasuredHeightAndState() { 8374 return mMeasuredHeight; 8375 } 8376 8377 /** 8378 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8379 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8380 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8381 * and the height component is at the shifted bits 8382 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8383 */ 8384 public final int getMeasuredState() { 8385 return (mMeasuredWidth&MEASURED_STATE_MASK) 8386 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8387 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8388 } 8389 8390 /** 8391 * The transform matrix of this view, which is calculated based on the current 8392 * roation, scale, and pivot properties. 8393 * 8394 * @see #getRotation() 8395 * @see #getScaleX() 8396 * @see #getScaleY() 8397 * @see #getPivotX() 8398 * @see #getPivotY() 8399 * @return The current transform matrix for the view 8400 */ 8401 public Matrix getMatrix() { 8402 if (mTransformationInfo != null) { 8403 updateMatrix(); 8404 return mTransformationInfo.mMatrix; 8405 } 8406 return Matrix.IDENTITY_MATRIX; 8407 } 8408 8409 /** 8410 * Utility function to determine if the value is far enough away from zero to be 8411 * considered non-zero. 8412 * @param value A floating point value to check for zero-ness 8413 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8414 */ 8415 private static boolean nonzero(float value) { 8416 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8417 } 8418 8419 /** 8420 * Returns true if the transform matrix is the identity matrix. 8421 * Recomputes the matrix if necessary. 8422 * 8423 * @return True if the transform matrix is the identity matrix, false otherwise. 8424 */ 8425 final boolean hasIdentityMatrix() { 8426 if (mTransformationInfo != null) { 8427 updateMatrix(); 8428 return mTransformationInfo.mMatrixIsIdentity; 8429 } 8430 return true; 8431 } 8432 8433 void ensureTransformationInfo() { 8434 if (mTransformationInfo == null) { 8435 mTransformationInfo = new TransformationInfo(); 8436 } 8437 } 8438 8439 /** 8440 * Recomputes the transform matrix if necessary. 8441 */ 8442 private void updateMatrix() { 8443 final TransformationInfo info = mTransformationInfo; 8444 if (info == null) { 8445 return; 8446 } 8447 if (info.mMatrixDirty) { 8448 // transform-related properties have changed since the last time someone 8449 // asked for the matrix; recalculate it with the current values 8450 8451 // Figure out if we need to update the pivot point 8452 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8453 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8454 info.mPrevWidth = mRight - mLeft; 8455 info.mPrevHeight = mBottom - mTop; 8456 info.mPivotX = info.mPrevWidth / 2f; 8457 info.mPivotY = info.mPrevHeight / 2f; 8458 } 8459 } 8460 info.mMatrix.reset(); 8461 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8462 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8463 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8464 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8465 } else { 8466 if (info.mCamera == null) { 8467 info.mCamera = new Camera(); 8468 info.matrix3D = new Matrix(); 8469 } 8470 info.mCamera.save(); 8471 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8472 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8473 info.mCamera.getMatrix(info.matrix3D); 8474 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8475 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8476 info.mPivotY + info.mTranslationY); 8477 info.mMatrix.postConcat(info.matrix3D); 8478 info.mCamera.restore(); 8479 } 8480 info.mMatrixDirty = false; 8481 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8482 info.mInverseMatrixDirty = true; 8483 } 8484 } 8485 8486 /** 8487 * Utility method to retrieve the inverse of the current mMatrix property. 8488 * We cache the matrix to avoid recalculating it when transform properties 8489 * have not changed. 8490 * 8491 * @return The inverse of the current matrix of this view. 8492 */ 8493 final Matrix getInverseMatrix() { 8494 final TransformationInfo info = mTransformationInfo; 8495 if (info != null) { 8496 updateMatrix(); 8497 if (info.mInverseMatrixDirty) { 8498 if (info.mInverseMatrix == null) { 8499 info.mInverseMatrix = new Matrix(); 8500 } 8501 info.mMatrix.invert(info.mInverseMatrix); 8502 info.mInverseMatrixDirty = false; 8503 } 8504 return info.mInverseMatrix; 8505 } 8506 return Matrix.IDENTITY_MATRIX; 8507 } 8508 8509 /** 8510 * Gets the distance along the Z axis from the camera to this view. 8511 * 8512 * @see #setCameraDistance(float) 8513 * 8514 * @return The distance along the Z axis. 8515 */ 8516 public float getCameraDistance() { 8517 ensureTransformationInfo(); 8518 final float dpi = mResources.getDisplayMetrics().densityDpi; 8519 final TransformationInfo info = mTransformationInfo; 8520 if (info.mCamera == null) { 8521 info.mCamera = new Camera(); 8522 info.matrix3D = new Matrix(); 8523 } 8524 return -(info.mCamera.getLocationZ() * dpi); 8525 } 8526 8527 /** 8528 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8529 * views are drawn) from the camera to this view. The camera's distance 8530 * affects 3D transformations, for instance rotations around the X and Y 8531 * axis. If the rotationX or rotationY properties are changed and this view is 8532 * large (more than half the size of the screen), it is recommended to always 8533 * use a camera distance that's greater than the height (X axis rotation) or 8534 * the width (Y axis rotation) of this view.</p> 8535 * 8536 * <p>The distance of the camera from the view plane can have an affect on the 8537 * perspective distortion of the view when it is rotated around the x or y axis. 8538 * For example, a large distance will result in a large viewing angle, and there 8539 * will not be much perspective distortion of the view as it rotates. A short 8540 * distance may cause much more perspective distortion upon rotation, and can 8541 * also result in some drawing artifacts if the rotated view ends up partially 8542 * behind the camera (which is why the recommendation is to use a distance at 8543 * least as far as the size of the view, if the view is to be rotated.)</p> 8544 * 8545 * <p>The distance is expressed in "depth pixels." The default distance depends 8546 * on the screen density. For instance, on a medium density display, the 8547 * default distance is 1280. On a high density display, the default distance 8548 * is 1920.</p> 8549 * 8550 * <p>If you want to specify a distance that leads to visually consistent 8551 * results across various densities, use the following formula:</p> 8552 * <pre> 8553 * float scale = context.getResources().getDisplayMetrics().density; 8554 * view.setCameraDistance(distance * scale); 8555 * </pre> 8556 * 8557 * <p>The density scale factor of a high density display is 1.5, 8558 * and 1920 = 1280 * 1.5.</p> 8559 * 8560 * @param distance The distance in "depth pixels", if negative the opposite 8561 * value is used 8562 * 8563 * @see #setRotationX(float) 8564 * @see #setRotationY(float) 8565 */ 8566 public void setCameraDistance(float distance) { 8567 invalidateViewProperty(true, false); 8568 8569 ensureTransformationInfo(); 8570 final float dpi = mResources.getDisplayMetrics().densityDpi; 8571 final TransformationInfo info = mTransformationInfo; 8572 if (info.mCamera == null) { 8573 info.mCamera = new Camera(); 8574 info.matrix3D = new Matrix(); 8575 } 8576 8577 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8578 info.mMatrixDirty = true; 8579 8580 invalidateViewProperty(false, false); 8581 if (mDisplayList != null) { 8582 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8583 } 8584 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8585 // View was rejected last time it was drawn by its parent; this may have changed 8586 invalidateParentIfNeeded(); 8587 } 8588 } 8589 8590 /** 8591 * The degrees that the view is rotated around the pivot point. 8592 * 8593 * @see #setRotation(float) 8594 * @see #getPivotX() 8595 * @see #getPivotY() 8596 * 8597 * @return The degrees of rotation. 8598 */ 8599 @ViewDebug.ExportedProperty(category = "drawing") 8600 public float getRotation() { 8601 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8602 } 8603 8604 /** 8605 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8606 * result in clockwise rotation. 8607 * 8608 * @param rotation The degrees of rotation. 8609 * 8610 * @see #getRotation() 8611 * @see #getPivotX() 8612 * @see #getPivotY() 8613 * @see #setRotationX(float) 8614 * @see #setRotationY(float) 8615 * 8616 * @attr ref android.R.styleable#View_rotation 8617 */ 8618 public void setRotation(float rotation) { 8619 ensureTransformationInfo(); 8620 final TransformationInfo info = mTransformationInfo; 8621 if (info.mRotation != rotation) { 8622 // Double-invalidation is necessary to capture view's old and new areas 8623 invalidateViewProperty(true, false); 8624 info.mRotation = rotation; 8625 info.mMatrixDirty = true; 8626 invalidateViewProperty(false, true); 8627 if (mDisplayList != null) { 8628 mDisplayList.setRotation(rotation); 8629 } 8630 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8631 // View was rejected last time it was drawn by its parent; this may have changed 8632 invalidateParentIfNeeded(); 8633 } 8634 } 8635 } 8636 8637 /** 8638 * The degrees that the view is rotated around the vertical axis through the pivot point. 8639 * 8640 * @see #getPivotX() 8641 * @see #getPivotY() 8642 * @see #setRotationY(float) 8643 * 8644 * @return The degrees of Y rotation. 8645 */ 8646 @ViewDebug.ExportedProperty(category = "drawing") 8647 public float getRotationY() { 8648 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8649 } 8650 8651 /** 8652 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8653 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8654 * down the y axis. 8655 * 8656 * When rotating large views, it is recommended to adjust the camera distance 8657 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8658 * 8659 * @param rotationY The degrees of Y rotation. 8660 * 8661 * @see #getRotationY() 8662 * @see #getPivotX() 8663 * @see #getPivotY() 8664 * @see #setRotation(float) 8665 * @see #setRotationX(float) 8666 * @see #setCameraDistance(float) 8667 * 8668 * @attr ref android.R.styleable#View_rotationY 8669 */ 8670 public void setRotationY(float rotationY) { 8671 ensureTransformationInfo(); 8672 final TransformationInfo info = mTransformationInfo; 8673 if (info.mRotationY != rotationY) { 8674 invalidateViewProperty(true, false); 8675 info.mRotationY = rotationY; 8676 info.mMatrixDirty = true; 8677 invalidateViewProperty(false, true); 8678 if (mDisplayList != null) { 8679 mDisplayList.setRotationY(rotationY); 8680 } 8681 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8682 // View was rejected last time it was drawn by its parent; this may have changed 8683 invalidateParentIfNeeded(); 8684 } 8685 } 8686 } 8687 8688 /** 8689 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8690 * 8691 * @see #getPivotX() 8692 * @see #getPivotY() 8693 * @see #setRotationX(float) 8694 * 8695 * @return The degrees of X rotation. 8696 */ 8697 @ViewDebug.ExportedProperty(category = "drawing") 8698 public float getRotationX() { 8699 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8700 } 8701 8702 /** 8703 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8704 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8705 * x axis. 8706 * 8707 * When rotating large views, it is recommended to adjust the camera distance 8708 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8709 * 8710 * @param rotationX The degrees of X rotation. 8711 * 8712 * @see #getRotationX() 8713 * @see #getPivotX() 8714 * @see #getPivotY() 8715 * @see #setRotation(float) 8716 * @see #setRotationY(float) 8717 * @see #setCameraDistance(float) 8718 * 8719 * @attr ref android.R.styleable#View_rotationX 8720 */ 8721 public void setRotationX(float rotationX) { 8722 ensureTransformationInfo(); 8723 final TransformationInfo info = mTransformationInfo; 8724 if (info.mRotationX != rotationX) { 8725 invalidateViewProperty(true, false); 8726 info.mRotationX = rotationX; 8727 info.mMatrixDirty = true; 8728 invalidateViewProperty(false, true); 8729 if (mDisplayList != null) { 8730 mDisplayList.setRotationX(rotationX); 8731 } 8732 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8733 // View was rejected last time it was drawn by its parent; this may have changed 8734 invalidateParentIfNeeded(); 8735 } 8736 } 8737 } 8738 8739 /** 8740 * The amount that the view is scaled in x around the pivot point, as a proportion of 8741 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8742 * 8743 * <p>By default, this is 1.0f. 8744 * 8745 * @see #getPivotX() 8746 * @see #getPivotY() 8747 * @return The scaling factor. 8748 */ 8749 @ViewDebug.ExportedProperty(category = "drawing") 8750 public float getScaleX() { 8751 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8752 } 8753 8754 /** 8755 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8756 * the view's unscaled width. A value of 1 means that no scaling is applied. 8757 * 8758 * @param scaleX The scaling factor. 8759 * @see #getPivotX() 8760 * @see #getPivotY() 8761 * 8762 * @attr ref android.R.styleable#View_scaleX 8763 */ 8764 public void setScaleX(float scaleX) { 8765 ensureTransformationInfo(); 8766 final TransformationInfo info = mTransformationInfo; 8767 if (info.mScaleX != scaleX) { 8768 invalidateViewProperty(true, false); 8769 info.mScaleX = scaleX; 8770 info.mMatrixDirty = true; 8771 invalidateViewProperty(false, true); 8772 if (mDisplayList != null) { 8773 mDisplayList.setScaleX(scaleX); 8774 } 8775 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8776 // View was rejected last time it was drawn by its parent; this may have changed 8777 invalidateParentIfNeeded(); 8778 } 8779 } 8780 } 8781 8782 /** 8783 * The amount that the view is scaled in y around the pivot point, as a proportion of 8784 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8785 * 8786 * <p>By default, this is 1.0f. 8787 * 8788 * @see #getPivotX() 8789 * @see #getPivotY() 8790 * @return The scaling factor. 8791 */ 8792 @ViewDebug.ExportedProperty(category = "drawing") 8793 public float getScaleY() { 8794 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8795 } 8796 8797 /** 8798 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8799 * the view's unscaled width. A value of 1 means that no scaling is applied. 8800 * 8801 * @param scaleY The scaling factor. 8802 * @see #getPivotX() 8803 * @see #getPivotY() 8804 * 8805 * @attr ref android.R.styleable#View_scaleY 8806 */ 8807 public void setScaleY(float scaleY) { 8808 ensureTransformationInfo(); 8809 final TransformationInfo info = mTransformationInfo; 8810 if (info.mScaleY != scaleY) { 8811 invalidateViewProperty(true, false); 8812 info.mScaleY = scaleY; 8813 info.mMatrixDirty = true; 8814 invalidateViewProperty(false, true); 8815 if (mDisplayList != null) { 8816 mDisplayList.setScaleY(scaleY); 8817 } 8818 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8819 // View was rejected last time it was drawn by its parent; this may have changed 8820 invalidateParentIfNeeded(); 8821 } 8822 } 8823 } 8824 8825 /** 8826 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8827 * and {@link #setScaleX(float) scaled}. 8828 * 8829 * @see #getRotation() 8830 * @see #getScaleX() 8831 * @see #getScaleY() 8832 * @see #getPivotY() 8833 * @return The x location of the pivot point. 8834 * 8835 * @attr ref android.R.styleable#View_transformPivotX 8836 */ 8837 @ViewDebug.ExportedProperty(category = "drawing") 8838 public float getPivotX() { 8839 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8840 } 8841 8842 /** 8843 * Sets the x location of the point around which the view is 8844 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8845 * By default, the pivot point is centered on the object. 8846 * Setting this property disables this behavior and causes the view to use only the 8847 * explicitly set pivotX and pivotY values. 8848 * 8849 * @param pivotX The x location of the pivot point. 8850 * @see #getRotation() 8851 * @see #getScaleX() 8852 * @see #getScaleY() 8853 * @see #getPivotY() 8854 * 8855 * @attr ref android.R.styleable#View_transformPivotX 8856 */ 8857 public void setPivotX(float pivotX) { 8858 ensureTransformationInfo(); 8859 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8860 final TransformationInfo info = mTransformationInfo; 8861 if (info.mPivotX != pivotX) { 8862 invalidateViewProperty(true, false); 8863 info.mPivotX = pivotX; 8864 info.mMatrixDirty = true; 8865 invalidateViewProperty(false, true); 8866 if (mDisplayList != null) { 8867 mDisplayList.setPivotX(pivotX); 8868 } 8869 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8870 // View was rejected last time it was drawn by its parent; this may have changed 8871 invalidateParentIfNeeded(); 8872 } 8873 } 8874 } 8875 8876 /** 8877 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8878 * and {@link #setScaleY(float) scaled}. 8879 * 8880 * @see #getRotation() 8881 * @see #getScaleX() 8882 * @see #getScaleY() 8883 * @see #getPivotY() 8884 * @return The y location of the pivot point. 8885 * 8886 * @attr ref android.R.styleable#View_transformPivotY 8887 */ 8888 @ViewDebug.ExportedProperty(category = "drawing") 8889 public float getPivotY() { 8890 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8891 } 8892 8893 /** 8894 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8895 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8896 * Setting this property disables this behavior and causes the view to use only the 8897 * explicitly set pivotX and pivotY values. 8898 * 8899 * @param pivotY The y location of the pivot point. 8900 * @see #getRotation() 8901 * @see #getScaleX() 8902 * @see #getScaleY() 8903 * @see #getPivotY() 8904 * 8905 * @attr ref android.R.styleable#View_transformPivotY 8906 */ 8907 public void setPivotY(float pivotY) { 8908 ensureTransformationInfo(); 8909 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8910 final TransformationInfo info = mTransformationInfo; 8911 if (info.mPivotY != pivotY) { 8912 invalidateViewProperty(true, false); 8913 info.mPivotY = pivotY; 8914 info.mMatrixDirty = true; 8915 invalidateViewProperty(false, true); 8916 if (mDisplayList != null) { 8917 mDisplayList.setPivotY(pivotY); 8918 } 8919 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8920 // View was rejected last time it was drawn by its parent; this may have changed 8921 invalidateParentIfNeeded(); 8922 } 8923 } 8924 } 8925 8926 /** 8927 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8928 * completely transparent and 1 means the view is completely opaque. 8929 * 8930 * <p>By default this is 1.0f. 8931 * @return The opacity of the view. 8932 */ 8933 @ViewDebug.ExportedProperty(category = "drawing") 8934 public float getAlpha() { 8935 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8936 } 8937 8938 /** 8939 * Returns whether this View has content which overlaps. This function, intended to be 8940 * overridden by specific View types, is an optimization when alpha is set on a view. If 8941 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8942 * and then composited it into place, which can be expensive. If the view has no overlapping 8943 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8944 * An example of overlapping rendering is a TextView with a background image, such as a 8945 * Button. An example of non-overlapping rendering is a TextView with no background, or 8946 * an ImageView with only the foreground image. The default implementation returns true; 8947 * subclasses should override if they have cases which can be optimized. 8948 * 8949 * @return true if the content in this view might overlap, false otherwise. 8950 */ 8951 public boolean hasOverlappingRendering() { 8952 return true; 8953 } 8954 8955 /** 8956 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8957 * completely transparent and 1 means the view is completely opaque.</p> 8958 * 8959 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8960 * responsible for applying the opacity itself. Otherwise, calling this method is 8961 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8962 * setting a hardware layer.</p> 8963 * 8964 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8965 * performance implications. It is generally best to use the alpha property sparingly and 8966 * transiently, as in the case of fading animations.</p> 8967 * 8968 * @param alpha The opacity of the view. 8969 * 8970 * @see #setLayerType(int, android.graphics.Paint) 8971 * 8972 * @attr ref android.R.styleable#View_alpha 8973 */ 8974 public void setAlpha(float alpha) { 8975 ensureTransformationInfo(); 8976 if (mTransformationInfo.mAlpha != alpha) { 8977 mTransformationInfo.mAlpha = alpha; 8978 if (onSetAlpha((int) (alpha * 255))) { 8979 mPrivateFlags |= ALPHA_SET; 8980 // subclass is handling alpha - don't optimize rendering cache invalidation 8981 invalidateParentCaches(); 8982 invalidate(true); 8983 } else { 8984 mPrivateFlags &= ~ALPHA_SET; 8985 invalidateViewProperty(true, false); 8986 if (mDisplayList != null) { 8987 mDisplayList.setAlpha(alpha); 8988 } 8989 } 8990 } 8991 } 8992 8993 /** 8994 * Faster version of setAlpha() which performs the same steps except there are 8995 * no calls to invalidate(). The caller of this function should perform proper invalidation 8996 * on the parent and this object. The return value indicates whether the subclass handles 8997 * alpha (the return value for onSetAlpha()). 8998 * 8999 * @param alpha The new value for the alpha property 9000 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9001 * the new value for the alpha property is different from the old value 9002 */ 9003 boolean setAlphaNoInvalidation(float alpha) { 9004 ensureTransformationInfo(); 9005 if (mTransformationInfo.mAlpha != alpha) { 9006 mTransformationInfo.mAlpha = alpha; 9007 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9008 if (subclassHandlesAlpha) { 9009 mPrivateFlags |= ALPHA_SET; 9010 return true; 9011 } else { 9012 mPrivateFlags &= ~ALPHA_SET; 9013 if (mDisplayList != null) { 9014 mDisplayList.setAlpha(alpha); 9015 } 9016 } 9017 } 9018 return false; 9019 } 9020 9021 /** 9022 * Top position of this view relative to its parent. 9023 * 9024 * @return The top of this view, in pixels. 9025 */ 9026 @ViewDebug.CapturedViewProperty 9027 public final int getTop() { 9028 return mTop; 9029 } 9030 9031 /** 9032 * Sets the top position of this view relative to its parent. This method is meant to be called 9033 * by the layout system and should not generally be called otherwise, because the property 9034 * may be changed at any time by the layout. 9035 * 9036 * @param top The top of this view, in pixels. 9037 */ 9038 public final void setTop(int top) { 9039 if (top != mTop) { 9040 updateMatrix(); 9041 final boolean matrixIsIdentity = mTransformationInfo == null 9042 || mTransformationInfo.mMatrixIsIdentity; 9043 if (matrixIsIdentity) { 9044 if (mAttachInfo != null) { 9045 int minTop; 9046 int yLoc; 9047 if (top < mTop) { 9048 minTop = top; 9049 yLoc = top - mTop; 9050 } else { 9051 minTop = mTop; 9052 yLoc = 0; 9053 } 9054 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9055 } 9056 } else { 9057 // Double-invalidation is necessary to capture view's old and new areas 9058 invalidate(true); 9059 } 9060 9061 int width = mRight - mLeft; 9062 int oldHeight = mBottom - mTop; 9063 9064 mTop = top; 9065 if (mDisplayList != null) { 9066 mDisplayList.setTop(mTop); 9067 } 9068 9069 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9070 9071 if (!matrixIsIdentity) { 9072 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9073 // A change in dimension means an auto-centered pivot point changes, too 9074 mTransformationInfo.mMatrixDirty = true; 9075 } 9076 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9077 invalidate(true); 9078 } 9079 mBackgroundSizeChanged = true; 9080 invalidateParentIfNeeded(); 9081 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9082 // View was rejected last time it was drawn by its parent; this may have changed 9083 invalidateParentIfNeeded(); 9084 } 9085 } 9086 } 9087 9088 /** 9089 * Bottom position of this view relative to its parent. 9090 * 9091 * @return The bottom of this view, in pixels. 9092 */ 9093 @ViewDebug.CapturedViewProperty 9094 public final int getBottom() { 9095 return mBottom; 9096 } 9097 9098 /** 9099 * True if this view has changed since the last time being drawn. 9100 * 9101 * @return The dirty state of this view. 9102 */ 9103 public boolean isDirty() { 9104 return (mPrivateFlags & DIRTY_MASK) != 0; 9105 } 9106 9107 /** 9108 * Sets the bottom position of this view relative to its parent. This method is meant to be 9109 * called by the layout system and should not generally be called otherwise, because the 9110 * property may be changed at any time by the layout. 9111 * 9112 * @param bottom The bottom of this view, in pixels. 9113 */ 9114 public final void setBottom(int bottom) { 9115 if (bottom != mBottom) { 9116 updateMatrix(); 9117 final boolean matrixIsIdentity = mTransformationInfo == null 9118 || mTransformationInfo.mMatrixIsIdentity; 9119 if (matrixIsIdentity) { 9120 if (mAttachInfo != null) { 9121 int maxBottom; 9122 if (bottom < mBottom) { 9123 maxBottom = mBottom; 9124 } else { 9125 maxBottom = bottom; 9126 } 9127 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9128 } 9129 } else { 9130 // Double-invalidation is necessary to capture view's old and new areas 9131 invalidate(true); 9132 } 9133 9134 int width = mRight - mLeft; 9135 int oldHeight = mBottom - mTop; 9136 9137 mBottom = bottom; 9138 if (mDisplayList != null) { 9139 mDisplayList.setBottom(mBottom); 9140 } 9141 9142 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9143 9144 if (!matrixIsIdentity) { 9145 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9146 // A change in dimension means an auto-centered pivot point changes, too 9147 mTransformationInfo.mMatrixDirty = true; 9148 } 9149 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9150 invalidate(true); 9151 } 9152 mBackgroundSizeChanged = true; 9153 invalidateParentIfNeeded(); 9154 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9155 // View was rejected last time it was drawn by its parent; this may have changed 9156 invalidateParentIfNeeded(); 9157 } 9158 } 9159 } 9160 9161 /** 9162 * Left position of this view relative to its parent. 9163 * 9164 * @return The left edge of this view, in pixels. 9165 */ 9166 @ViewDebug.CapturedViewProperty 9167 public final int getLeft() { 9168 return mLeft; 9169 } 9170 9171 /** 9172 * Sets the left position of this view relative to its parent. This method is meant to be called 9173 * by the layout system and should not generally be called otherwise, because the property 9174 * may be changed at any time by the layout. 9175 * 9176 * @param left The bottom of this view, in pixels. 9177 */ 9178 public final void setLeft(int left) { 9179 if (left != mLeft) { 9180 updateMatrix(); 9181 final boolean matrixIsIdentity = mTransformationInfo == null 9182 || mTransformationInfo.mMatrixIsIdentity; 9183 if (matrixIsIdentity) { 9184 if (mAttachInfo != null) { 9185 int minLeft; 9186 int xLoc; 9187 if (left < mLeft) { 9188 minLeft = left; 9189 xLoc = left - mLeft; 9190 } else { 9191 minLeft = mLeft; 9192 xLoc = 0; 9193 } 9194 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9195 } 9196 } else { 9197 // Double-invalidation is necessary to capture view's old and new areas 9198 invalidate(true); 9199 } 9200 9201 int oldWidth = mRight - mLeft; 9202 int height = mBottom - mTop; 9203 9204 mLeft = left; 9205 if (mDisplayList != null) { 9206 mDisplayList.setLeft(left); 9207 } 9208 9209 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9210 9211 if (!matrixIsIdentity) { 9212 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9213 // A change in dimension means an auto-centered pivot point changes, too 9214 mTransformationInfo.mMatrixDirty = true; 9215 } 9216 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9217 invalidate(true); 9218 } 9219 mBackgroundSizeChanged = true; 9220 invalidateParentIfNeeded(); 9221 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9222 // View was rejected last time it was drawn by its parent; this may have changed 9223 invalidateParentIfNeeded(); 9224 } 9225 } 9226 } 9227 9228 /** 9229 * Right position of this view relative to its parent. 9230 * 9231 * @return The right edge of this view, in pixels. 9232 */ 9233 @ViewDebug.CapturedViewProperty 9234 public final int getRight() { 9235 return mRight; 9236 } 9237 9238 /** 9239 * Sets the right position of this view relative to its parent. This method is meant to be called 9240 * by the layout system and should not generally be called otherwise, because the property 9241 * may be changed at any time by the layout. 9242 * 9243 * @param right The bottom of this view, in pixels. 9244 */ 9245 public final void setRight(int right) { 9246 if (right != mRight) { 9247 updateMatrix(); 9248 final boolean matrixIsIdentity = mTransformationInfo == null 9249 || mTransformationInfo.mMatrixIsIdentity; 9250 if (matrixIsIdentity) { 9251 if (mAttachInfo != null) { 9252 int maxRight; 9253 if (right < mRight) { 9254 maxRight = mRight; 9255 } else { 9256 maxRight = right; 9257 } 9258 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9259 } 9260 } else { 9261 // Double-invalidation is necessary to capture view's old and new areas 9262 invalidate(true); 9263 } 9264 9265 int oldWidth = mRight - mLeft; 9266 int height = mBottom - mTop; 9267 9268 mRight = right; 9269 if (mDisplayList != null) { 9270 mDisplayList.setRight(mRight); 9271 } 9272 9273 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9274 9275 if (!matrixIsIdentity) { 9276 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9277 // A change in dimension means an auto-centered pivot point changes, too 9278 mTransformationInfo.mMatrixDirty = true; 9279 } 9280 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9281 invalidate(true); 9282 } 9283 mBackgroundSizeChanged = true; 9284 invalidateParentIfNeeded(); 9285 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9286 // View was rejected last time it was drawn by its parent; this may have changed 9287 invalidateParentIfNeeded(); 9288 } 9289 } 9290 } 9291 9292 /** 9293 * The visual x position of this view, in pixels. This is equivalent to the 9294 * {@link #setTranslationX(float) translationX} property plus the current 9295 * {@link #getLeft() left} property. 9296 * 9297 * @return The visual x position of this view, in pixels. 9298 */ 9299 @ViewDebug.ExportedProperty(category = "drawing") 9300 public float getX() { 9301 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9302 } 9303 9304 /** 9305 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9306 * {@link #setTranslationX(float) translationX} property to be the difference between 9307 * the x value passed in and the current {@link #getLeft() left} property. 9308 * 9309 * @param x The visual x position of this view, in pixels. 9310 */ 9311 public void setX(float x) { 9312 setTranslationX(x - mLeft); 9313 } 9314 9315 /** 9316 * The visual y position of this view, in pixels. This is equivalent to the 9317 * {@link #setTranslationY(float) translationY} property plus the current 9318 * {@link #getTop() top} property. 9319 * 9320 * @return The visual y position of this view, in pixels. 9321 */ 9322 @ViewDebug.ExportedProperty(category = "drawing") 9323 public float getY() { 9324 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9325 } 9326 9327 /** 9328 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9329 * {@link #setTranslationY(float) translationY} property to be the difference between 9330 * the y value passed in and the current {@link #getTop() top} property. 9331 * 9332 * @param y The visual y position of this view, in pixels. 9333 */ 9334 public void setY(float y) { 9335 setTranslationY(y - mTop); 9336 } 9337 9338 9339 /** 9340 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9341 * This position is post-layout, in addition to wherever the object's 9342 * layout placed it. 9343 * 9344 * @return The horizontal position of this view relative to its left position, in pixels. 9345 */ 9346 @ViewDebug.ExportedProperty(category = "drawing") 9347 public float getTranslationX() { 9348 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9349 } 9350 9351 /** 9352 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9353 * This effectively positions the object post-layout, in addition to wherever the object's 9354 * layout placed it. 9355 * 9356 * @param translationX The horizontal position of this view relative to its left position, 9357 * in pixels. 9358 * 9359 * @attr ref android.R.styleable#View_translationX 9360 */ 9361 public void setTranslationX(float translationX) { 9362 ensureTransformationInfo(); 9363 final TransformationInfo info = mTransformationInfo; 9364 if (info.mTranslationX != translationX) { 9365 // Double-invalidation is necessary to capture view's old and new areas 9366 invalidateViewProperty(true, false); 9367 info.mTranslationX = translationX; 9368 info.mMatrixDirty = true; 9369 invalidateViewProperty(false, true); 9370 if (mDisplayList != null) { 9371 mDisplayList.setTranslationX(translationX); 9372 } 9373 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9374 // View was rejected last time it was drawn by its parent; this may have changed 9375 invalidateParentIfNeeded(); 9376 } 9377 } 9378 } 9379 9380 /** 9381 * The horizontal location of this view relative to its {@link #getTop() top} position. 9382 * This position is post-layout, in addition to wherever the object's 9383 * layout placed it. 9384 * 9385 * @return The vertical position of this view relative to its top position, 9386 * in pixels. 9387 */ 9388 @ViewDebug.ExportedProperty(category = "drawing") 9389 public float getTranslationY() { 9390 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9391 } 9392 9393 /** 9394 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9395 * This effectively positions the object post-layout, in addition to wherever the object's 9396 * layout placed it. 9397 * 9398 * @param translationY The vertical position of this view relative to its top position, 9399 * in pixels. 9400 * 9401 * @attr ref android.R.styleable#View_translationY 9402 */ 9403 public void setTranslationY(float translationY) { 9404 ensureTransformationInfo(); 9405 final TransformationInfo info = mTransformationInfo; 9406 if (info.mTranslationY != translationY) { 9407 invalidateViewProperty(true, false); 9408 info.mTranslationY = translationY; 9409 info.mMatrixDirty = true; 9410 invalidateViewProperty(false, true); 9411 if (mDisplayList != null) { 9412 mDisplayList.setTranslationY(translationY); 9413 } 9414 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9415 // View was rejected last time it was drawn by its parent; this may have changed 9416 invalidateParentIfNeeded(); 9417 } 9418 } 9419 } 9420 9421 /** 9422 * Hit rectangle in parent's coordinates 9423 * 9424 * @param outRect The hit rectangle of the view. 9425 */ 9426 public void getHitRect(Rect outRect) { 9427 updateMatrix(); 9428 final TransformationInfo info = mTransformationInfo; 9429 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9430 outRect.set(mLeft, mTop, mRight, mBottom); 9431 } else { 9432 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9433 tmpRect.set(-info.mPivotX, -info.mPivotY, 9434 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9435 info.mMatrix.mapRect(tmpRect); 9436 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9437 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9438 } 9439 } 9440 9441 /** 9442 * Determines whether the given point, in local coordinates is inside the view. 9443 */ 9444 /*package*/ final boolean pointInView(float localX, float localY) { 9445 return localX >= 0 && localX < (mRight - mLeft) 9446 && localY >= 0 && localY < (mBottom - mTop); 9447 } 9448 9449 /** 9450 * Utility method to determine whether the given point, in local coordinates, 9451 * is inside the view, where the area of the view is expanded by the slop factor. 9452 * This method is called while processing touch-move events to determine if the event 9453 * is still within the view. 9454 */ 9455 private boolean pointInView(float localX, float localY, float slop) { 9456 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9457 localY < ((mBottom - mTop) + slop); 9458 } 9459 9460 /** 9461 * When a view has focus and the user navigates away from it, the next view is searched for 9462 * starting from the rectangle filled in by this method. 9463 * 9464 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9465 * of the view. However, if your view maintains some idea of internal selection, 9466 * such as a cursor, or a selected row or column, you should override this method and 9467 * fill in a more specific rectangle. 9468 * 9469 * @param r The rectangle to fill in, in this view's coordinates. 9470 */ 9471 public void getFocusedRect(Rect r) { 9472 getDrawingRect(r); 9473 } 9474 9475 /** 9476 * If some part of this view is not clipped by any of its parents, then 9477 * return that area in r in global (root) coordinates. To convert r to local 9478 * coordinates (without taking possible View rotations into account), offset 9479 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9480 * If the view is completely clipped or translated out, return false. 9481 * 9482 * @param r If true is returned, r holds the global coordinates of the 9483 * visible portion of this view. 9484 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9485 * between this view and its root. globalOffet may be null. 9486 * @return true if r is non-empty (i.e. part of the view is visible at the 9487 * root level. 9488 */ 9489 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9490 int width = mRight - mLeft; 9491 int height = mBottom - mTop; 9492 if (width > 0 && height > 0) { 9493 r.set(0, 0, width, height); 9494 if (globalOffset != null) { 9495 globalOffset.set(-mScrollX, -mScrollY); 9496 } 9497 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9498 } 9499 return false; 9500 } 9501 9502 public final boolean getGlobalVisibleRect(Rect r) { 9503 return getGlobalVisibleRect(r, null); 9504 } 9505 9506 public final boolean getLocalVisibleRect(Rect r) { 9507 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9508 if (getGlobalVisibleRect(r, offset)) { 9509 r.offset(-offset.x, -offset.y); // make r local 9510 return true; 9511 } 9512 return false; 9513 } 9514 9515 /** 9516 * Offset this view's vertical location by the specified number of pixels. 9517 * 9518 * @param offset the number of pixels to offset the view by 9519 */ 9520 public void offsetTopAndBottom(int offset) { 9521 if (offset != 0) { 9522 updateMatrix(); 9523 final boolean matrixIsIdentity = mTransformationInfo == null 9524 || mTransformationInfo.mMatrixIsIdentity; 9525 if (matrixIsIdentity) { 9526 if (mDisplayList != null) { 9527 invalidateViewProperty(false, false); 9528 } else { 9529 final ViewParent p = mParent; 9530 if (p != null && mAttachInfo != null) { 9531 final Rect r = mAttachInfo.mTmpInvalRect; 9532 int minTop; 9533 int maxBottom; 9534 int yLoc; 9535 if (offset < 0) { 9536 minTop = mTop + offset; 9537 maxBottom = mBottom; 9538 yLoc = offset; 9539 } else { 9540 minTop = mTop; 9541 maxBottom = mBottom + offset; 9542 yLoc = 0; 9543 } 9544 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9545 p.invalidateChild(this, r); 9546 } 9547 } 9548 } else { 9549 invalidateViewProperty(false, false); 9550 } 9551 9552 mTop += offset; 9553 mBottom += offset; 9554 if (mDisplayList != null) { 9555 mDisplayList.offsetTopBottom(offset); 9556 invalidateViewProperty(false, false); 9557 } else { 9558 if (!matrixIsIdentity) { 9559 invalidateViewProperty(false, true); 9560 } 9561 invalidateParentIfNeeded(); 9562 } 9563 } 9564 } 9565 9566 /** 9567 * Offset this view's horizontal location by the specified amount of pixels. 9568 * 9569 * @param offset the numer of pixels to offset the view by 9570 */ 9571 public void offsetLeftAndRight(int offset) { 9572 if (offset != 0) { 9573 updateMatrix(); 9574 final boolean matrixIsIdentity = mTransformationInfo == null 9575 || mTransformationInfo.mMatrixIsIdentity; 9576 if (matrixIsIdentity) { 9577 if (mDisplayList != null) { 9578 invalidateViewProperty(false, false); 9579 } else { 9580 final ViewParent p = mParent; 9581 if (p != null && mAttachInfo != null) { 9582 final Rect r = mAttachInfo.mTmpInvalRect; 9583 int minLeft; 9584 int maxRight; 9585 if (offset < 0) { 9586 minLeft = mLeft + offset; 9587 maxRight = mRight; 9588 } else { 9589 minLeft = mLeft; 9590 maxRight = mRight + offset; 9591 } 9592 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9593 p.invalidateChild(this, r); 9594 } 9595 } 9596 } else { 9597 invalidateViewProperty(false, false); 9598 } 9599 9600 mLeft += offset; 9601 mRight += offset; 9602 if (mDisplayList != null) { 9603 mDisplayList.offsetLeftRight(offset); 9604 invalidateViewProperty(false, false); 9605 } else { 9606 if (!matrixIsIdentity) { 9607 invalidateViewProperty(false, true); 9608 } 9609 invalidateParentIfNeeded(); 9610 } 9611 } 9612 } 9613 9614 /** 9615 * Get the LayoutParams associated with this view. All views should have 9616 * layout parameters. These supply parameters to the <i>parent</i> of this 9617 * view specifying how it should be arranged. There are many subclasses of 9618 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9619 * of ViewGroup that are responsible for arranging their children. 9620 * 9621 * This method may return null if this View is not attached to a parent 9622 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9623 * was not invoked successfully. When a View is attached to a parent 9624 * ViewGroup, this method must not return null. 9625 * 9626 * @return The LayoutParams associated with this view, or null if no 9627 * parameters have been set yet 9628 */ 9629 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9630 public ViewGroup.LayoutParams getLayoutParams() { 9631 return mLayoutParams; 9632 } 9633 9634 /** 9635 * Set the layout parameters associated with this view. These supply 9636 * parameters to the <i>parent</i> of this view specifying how it should be 9637 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9638 * correspond to the different subclasses of ViewGroup that are responsible 9639 * for arranging their children. 9640 * 9641 * @param params The layout parameters for this view, cannot be null 9642 */ 9643 public void setLayoutParams(ViewGroup.LayoutParams params) { 9644 if (params == null) { 9645 throw new NullPointerException("Layout parameters cannot be null"); 9646 } 9647 mLayoutParams = params; 9648 if (mParent instanceof ViewGroup) { 9649 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9650 } 9651 requestLayout(); 9652 } 9653 9654 /** 9655 * Set the scrolled position of your view. This will cause a call to 9656 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9657 * invalidated. 9658 * @param x the x position to scroll to 9659 * @param y the y position to scroll to 9660 */ 9661 public void scrollTo(int x, int y) { 9662 if (mScrollX != x || mScrollY != y) { 9663 int oldX = mScrollX; 9664 int oldY = mScrollY; 9665 mScrollX = x; 9666 mScrollY = y; 9667 invalidateParentCaches(); 9668 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9669 if (!awakenScrollBars()) { 9670 postInvalidateOnAnimation(); 9671 } 9672 } 9673 } 9674 9675 /** 9676 * Move the scrolled position of your view. This will cause a call to 9677 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9678 * invalidated. 9679 * @param x the amount of pixels to scroll by horizontally 9680 * @param y the amount of pixels to scroll by vertically 9681 */ 9682 public void scrollBy(int x, int y) { 9683 scrollTo(mScrollX + x, mScrollY + y); 9684 } 9685 9686 /** 9687 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9688 * animation to fade the scrollbars out after a default delay. If a subclass 9689 * provides animated scrolling, the start delay should equal the duration 9690 * of the scrolling animation.</p> 9691 * 9692 * <p>The animation starts only if at least one of the scrollbars is 9693 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9694 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9695 * this method returns true, and false otherwise. If the animation is 9696 * started, this method calls {@link #invalidate()}; in that case the 9697 * caller should not call {@link #invalidate()}.</p> 9698 * 9699 * <p>This method should be invoked every time a subclass directly updates 9700 * the scroll parameters.</p> 9701 * 9702 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9703 * and {@link #scrollTo(int, int)}.</p> 9704 * 9705 * @return true if the animation is played, false otherwise 9706 * 9707 * @see #awakenScrollBars(int) 9708 * @see #scrollBy(int, int) 9709 * @see #scrollTo(int, int) 9710 * @see #isHorizontalScrollBarEnabled() 9711 * @see #isVerticalScrollBarEnabled() 9712 * @see #setHorizontalScrollBarEnabled(boolean) 9713 * @see #setVerticalScrollBarEnabled(boolean) 9714 */ 9715 protected boolean awakenScrollBars() { 9716 return mScrollCache != null && 9717 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9718 } 9719 9720 /** 9721 * Trigger the scrollbars to draw. 9722 * This method differs from awakenScrollBars() only in its default duration. 9723 * initialAwakenScrollBars() will show the scroll bars for longer than 9724 * usual to give the user more of a chance to notice them. 9725 * 9726 * @return true if the animation is played, false otherwise. 9727 */ 9728 private boolean initialAwakenScrollBars() { 9729 return mScrollCache != null && 9730 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9731 } 9732 9733 /** 9734 * <p> 9735 * Trigger the scrollbars to draw. When invoked this method starts an 9736 * animation to fade the scrollbars out after a fixed delay. If a subclass 9737 * provides animated scrolling, the start delay should equal the duration of 9738 * the scrolling animation. 9739 * </p> 9740 * 9741 * <p> 9742 * The animation starts only if at least one of the scrollbars is enabled, 9743 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9744 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9745 * this method returns true, and false otherwise. If the animation is 9746 * started, this method calls {@link #invalidate()}; in that case the caller 9747 * should not call {@link #invalidate()}. 9748 * </p> 9749 * 9750 * <p> 9751 * This method should be invoked everytime a subclass directly updates the 9752 * scroll parameters. 9753 * </p> 9754 * 9755 * @param startDelay the delay, in milliseconds, after which the animation 9756 * should start; when the delay is 0, the animation starts 9757 * immediately 9758 * @return true if the animation is played, false otherwise 9759 * 9760 * @see #scrollBy(int, int) 9761 * @see #scrollTo(int, int) 9762 * @see #isHorizontalScrollBarEnabled() 9763 * @see #isVerticalScrollBarEnabled() 9764 * @see #setHorizontalScrollBarEnabled(boolean) 9765 * @see #setVerticalScrollBarEnabled(boolean) 9766 */ 9767 protected boolean awakenScrollBars(int startDelay) { 9768 return awakenScrollBars(startDelay, true); 9769 } 9770 9771 /** 9772 * <p> 9773 * Trigger the scrollbars to draw. When invoked this method starts an 9774 * animation to fade the scrollbars out after a fixed delay. If a subclass 9775 * provides animated scrolling, the start delay should equal the duration of 9776 * the scrolling animation. 9777 * </p> 9778 * 9779 * <p> 9780 * The animation starts only if at least one of the scrollbars is enabled, 9781 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9782 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9783 * this method returns true, and false otherwise. If the animation is 9784 * started, this method calls {@link #invalidate()} if the invalidate parameter 9785 * is set to true; in that case the caller 9786 * should not call {@link #invalidate()}. 9787 * </p> 9788 * 9789 * <p> 9790 * This method should be invoked everytime a subclass directly updates the 9791 * scroll parameters. 9792 * </p> 9793 * 9794 * @param startDelay the delay, in milliseconds, after which the animation 9795 * should start; when the delay is 0, the animation starts 9796 * immediately 9797 * 9798 * @param invalidate Wheter this method should call invalidate 9799 * 9800 * @return true if the animation is played, false otherwise 9801 * 9802 * @see #scrollBy(int, int) 9803 * @see #scrollTo(int, int) 9804 * @see #isHorizontalScrollBarEnabled() 9805 * @see #isVerticalScrollBarEnabled() 9806 * @see #setHorizontalScrollBarEnabled(boolean) 9807 * @see #setVerticalScrollBarEnabled(boolean) 9808 */ 9809 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9810 final ScrollabilityCache scrollCache = mScrollCache; 9811 9812 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9813 return false; 9814 } 9815 9816 if (scrollCache.scrollBar == null) { 9817 scrollCache.scrollBar = new ScrollBarDrawable(); 9818 } 9819 9820 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9821 9822 if (invalidate) { 9823 // Invalidate to show the scrollbars 9824 postInvalidateOnAnimation(); 9825 } 9826 9827 if (scrollCache.state == ScrollabilityCache.OFF) { 9828 // FIXME: this is copied from WindowManagerService. 9829 // We should get this value from the system when it 9830 // is possible to do so. 9831 final int KEY_REPEAT_FIRST_DELAY = 750; 9832 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9833 } 9834 9835 // Tell mScrollCache when we should start fading. This may 9836 // extend the fade start time if one was already scheduled 9837 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9838 scrollCache.fadeStartTime = fadeStartTime; 9839 scrollCache.state = ScrollabilityCache.ON; 9840 9841 // Schedule our fader to run, unscheduling any old ones first 9842 if (mAttachInfo != null) { 9843 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9844 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9845 } 9846 9847 return true; 9848 } 9849 9850 return false; 9851 } 9852 9853 /** 9854 * Do not invalidate views which are not visible and which are not running an animation. They 9855 * will not get drawn and they should not set dirty flags as if they will be drawn 9856 */ 9857 private boolean skipInvalidate() { 9858 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9859 (!(mParent instanceof ViewGroup) || 9860 !((ViewGroup) mParent).isViewTransitioning(this)); 9861 } 9862 /** 9863 * Mark the area defined by dirty as needing to be drawn. If the view is 9864 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9865 * in the future. This must be called from a UI thread. To call from a non-UI 9866 * thread, call {@link #postInvalidate()}. 9867 * 9868 * WARNING: This method is destructive to dirty. 9869 * @param dirty the rectangle representing the bounds of the dirty region 9870 */ 9871 public void invalidate(Rect dirty) { 9872 if (ViewDebug.TRACE_HIERARCHY) { 9873 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9874 } 9875 9876 if (skipInvalidate()) { 9877 return; 9878 } 9879 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9880 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9881 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9882 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9883 mPrivateFlags |= INVALIDATED; 9884 mPrivateFlags |= DIRTY; 9885 final ViewParent p = mParent; 9886 final AttachInfo ai = mAttachInfo; 9887 //noinspection PointlessBooleanExpression,ConstantConditions 9888 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9889 if (p != null && ai != null && ai.mHardwareAccelerated) { 9890 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9891 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9892 p.invalidateChild(this, null); 9893 return; 9894 } 9895 } 9896 if (p != null && ai != null) { 9897 final int scrollX = mScrollX; 9898 final int scrollY = mScrollY; 9899 final Rect r = ai.mTmpInvalRect; 9900 r.set(dirty.left - scrollX, dirty.top - scrollY, 9901 dirty.right - scrollX, dirty.bottom - scrollY); 9902 mParent.invalidateChild(this, r); 9903 } 9904 } 9905 } 9906 9907 /** 9908 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9909 * The coordinates of the dirty rect are relative to the view. 9910 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9911 * will be called at some point in the future. This must be called from 9912 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9913 * @param l the left position of the dirty region 9914 * @param t the top position of the dirty region 9915 * @param r the right position of the dirty region 9916 * @param b the bottom position of the dirty region 9917 */ 9918 public void invalidate(int l, int t, int r, int b) { 9919 if (ViewDebug.TRACE_HIERARCHY) { 9920 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9921 } 9922 9923 if (skipInvalidate()) { 9924 return; 9925 } 9926 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9927 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9928 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9929 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9930 mPrivateFlags |= INVALIDATED; 9931 mPrivateFlags |= DIRTY; 9932 final ViewParent p = mParent; 9933 final AttachInfo ai = mAttachInfo; 9934 //noinspection PointlessBooleanExpression,ConstantConditions 9935 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9936 if (p != null && ai != null && ai.mHardwareAccelerated) { 9937 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9938 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9939 p.invalidateChild(this, null); 9940 return; 9941 } 9942 } 9943 if (p != null && ai != null && l < r && t < b) { 9944 final int scrollX = mScrollX; 9945 final int scrollY = mScrollY; 9946 final Rect tmpr = ai.mTmpInvalRect; 9947 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9948 p.invalidateChild(this, tmpr); 9949 } 9950 } 9951 } 9952 9953 /** 9954 * Invalidate the whole view. If the view is visible, 9955 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9956 * the future. This must be called from a UI thread. To call from a non-UI thread, 9957 * call {@link #postInvalidate()}. 9958 */ 9959 public void invalidate() { 9960 invalidate(true); 9961 } 9962 9963 /** 9964 * This is where the invalidate() work actually happens. A full invalidate() 9965 * causes the drawing cache to be invalidated, but this function can be called with 9966 * invalidateCache set to false to skip that invalidation step for cases that do not 9967 * need it (for example, a component that remains at the same dimensions with the same 9968 * content). 9969 * 9970 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9971 * well. This is usually true for a full invalidate, but may be set to false if the 9972 * View's contents or dimensions have not changed. 9973 */ 9974 void invalidate(boolean invalidateCache) { 9975 if (ViewDebug.TRACE_HIERARCHY) { 9976 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9977 } 9978 9979 if (skipInvalidate()) { 9980 return; 9981 } 9982 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9983 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9984 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9985 mLastIsOpaque = isOpaque(); 9986 mPrivateFlags &= ~DRAWN; 9987 mPrivateFlags |= DIRTY; 9988 if (invalidateCache) { 9989 mPrivateFlags |= INVALIDATED; 9990 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9991 } 9992 final AttachInfo ai = mAttachInfo; 9993 final ViewParent p = mParent; 9994 //noinspection PointlessBooleanExpression,ConstantConditions 9995 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9996 if (p != null && ai != null && ai.mHardwareAccelerated) { 9997 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9998 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9999 p.invalidateChild(this, null); 10000 return; 10001 } 10002 } 10003 10004 if (p != null && ai != null) { 10005 final Rect r = ai.mTmpInvalRect; 10006 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10007 // Don't call invalidate -- we don't want to internally scroll 10008 // our own bounds 10009 p.invalidateChild(this, r); 10010 } 10011 } 10012 } 10013 10014 /** 10015 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10016 * set any flags or handle all of the cases handled by the default invalidation methods. 10017 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10018 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10019 * walk up the hierarchy, transforming the dirty rect as necessary. 10020 * 10021 * The method also handles normal invalidation logic if display list properties are not 10022 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10023 * backup approach, to handle these cases used in the various property-setting methods. 10024 * 10025 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10026 * are not being used in this view 10027 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10028 * list properties are not being used in this view 10029 */ 10030 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10031 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10032 if (invalidateParent) { 10033 invalidateParentCaches(); 10034 } 10035 if (forceRedraw) { 10036 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10037 } 10038 invalidate(false); 10039 } else { 10040 final AttachInfo ai = mAttachInfo; 10041 final ViewParent p = mParent; 10042 if (p != null && ai != null) { 10043 final Rect r = ai.mTmpInvalRect; 10044 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10045 if (mParent instanceof ViewGroup) { 10046 ((ViewGroup) mParent).invalidateChildFast(this, r); 10047 } else { 10048 mParent.invalidateChild(this, r); 10049 } 10050 } 10051 } 10052 } 10053 10054 /** 10055 * Utility method to transform a given Rect by the current matrix of this view. 10056 */ 10057 void transformRect(final Rect rect) { 10058 if (!getMatrix().isIdentity()) { 10059 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10060 boundingRect.set(rect); 10061 getMatrix().mapRect(boundingRect); 10062 rect.set((int) (boundingRect.left - 0.5f), 10063 (int) (boundingRect.top - 0.5f), 10064 (int) (boundingRect.right + 0.5f), 10065 (int) (boundingRect.bottom + 0.5f)); 10066 } 10067 } 10068 10069 /** 10070 * Used to indicate that the parent of this view should clear its caches. This functionality 10071 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10072 * which is necessary when various parent-managed properties of the view change, such as 10073 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10074 * clears the parent caches and does not causes an invalidate event. 10075 * 10076 * @hide 10077 */ 10078 protected void invalidateParentCaches() { 10079 if (mParent instanceof View) { 10080 ((View) mParent).mPrivateFlags |= INVALIDATED; 10081 } 10082 } 10083 10084 /** 10085 * Used to indicate that the parent of this view should be invalidated. This functionality 10086 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10087 * which is necessary when various parent-managed properties of the view change, such as 10088 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10089 * an invalidation event to the parent. 10090 * 10091 * @hide 10092 */ 10093 protected void invalidateParentIfNeeded() { 10094 if (isHardwareAccelerated() && mParent instanceof View) { 10095 ((View) mParent).invalidate(true); 10096 } 10097 } 10098 10099 /** 10100 * Indicates whether this View is opaque. An opaque View guarantees that it will 10101 * draw all the pixels overlapping its bounds using a fully opaque color. 10102 * 10103 * Subclasses of View should override this method whenever possible to indicate 10104 * whether an instance is opaque. Opaque Views are treated in a special way by 10105 * the View hierarchy, possibly allowing it to perform optimizations during 10106 * invalidate/draw passes. 10107 * 10108 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10109 */ 10110 @ViewDebug.ExportedProperty(category = "drawing") 10111 public boolean isOpaque() { 10112 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10113 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10114 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10115 } 10116 10117 /** 10118 * @hide 10119 */ 10120 protected void computeOpaqueFlags() { 10121 // Opaque if: 10122 // - Has a background 10123 // - Background is opaque 10124 // - Doesn't have scrollbars or scrollbars are inside overlay 10125 10126 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10127 mPrivateFlags |= OPAQUE_BACKGROUND; 10128 } else { 10129 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10130 } 10131 10132 final int flags = mViewFlags; 10133 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10134 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10135 mPrivateFlags |= OPAQUE_SCROLLBARS; 10136 } else { 10137 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10138 } 10139 } 10140 10141 /** 10142 * @hide 10143 */ 10144 protected boolean hasOpaqueScrollbars() { 10145 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10146 } 10147 10148 /** 10149 * @return A handler associated with the thread running the View. This 10150 * handler can be used to pump events in the UI events queue. 10151 */ 10152 public Handler getHandler() { 10153 if (mAttachInfo != null) { 10154 return mAttachInfo.mHandler; 10155 } 10156 return null; 10157 } 10158 10159 /** 10160 * Gets the view root associated with the View. 10161 * @return The view root, or null if none. 10162 * @hide 10163 */ 10164 public ViewRootImpl getViewRootImpl() { 10165 if (mAttachInfo != null) { 10166 return mAttachInfo.mViewRootImpl; 10167 } 10168 return null; 10169 } 10170 10171 /** 10172 * <p>Causes the Runnable to be added to the message queue. 10173 * The runnable will be run on the user interface thread.</p> 10174 * 10175 * <p>This method can be invoked from outside of the UI thread 10176 * only when this View is attached to a window.</p> 10177 * 10178 * @param action The Runnable that will be executed. 10179 * 10180 * @return Returns true if the Runnable was successfully placed in to the 10181 * message queue. Returns false on failure, usually because the 10182 * looper processing the message queue is exiting. 10183 * 10184 * @see #postDelayed 10185 * @see #removeCallbacks 10186 */ 10187 public boolean post(Runnable action) { 10188 final AttachInfo attachInfo = mAttachInfo; 10189 if (attachInfo != null) { 10190 return attachInfo.mHandler.post(action); 10191 } 10192 // Assume that post will succeed later 10193 ViewRootImpl.getRunQueue().post(action); 10194 return true; 10195 } 10196 10197 /** 10198 * <p>Causes the Runnable to be added to the message queue, to be run 10199 * after the specified amount of time elapses. 10200 * The runnable will be run on the user interface thread.</p> 10201 * 10202 * <p>This method can be invoked from outside of the UI thread 10203 * only when this View is attached to a window.</p> 10204 * 10205 * @param action The Runnable that will be executed. 10206 * @param delayMillis The delay (in milliseconds) until the Runnable 10207 * will be executed. 10208 * 10209 * @return true if the Runnable was successfully placed in to the 10210 * message queue. Returns false on failure, usually because the 10211 * looper processing the message queue is exiting. Note that a 10212 * result of true does not mean the Runnable will be processed -- 10213 * if the looper is quit before the delivery time of the message 10214 * occurs then the message will be dropped. 10215 * 10216 * @see #post 10217 * @see #removeCallbacks 10218 */ 10219 public boolean postDelayed(Runnable action, long delayMillis) { 10220 final AttachInfo attachInfo = mAttachInfo; 10221 if (attachInfo != null) { 10222 return attachInfo.mHandler.postDelayed(action, delayMillis); 10223 } 10224 // Assume that post will succeed later 10225 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10226 return true; 10227 } 10228 10229 /** 10230 * <p>Causes the Runnable to execute on the next animation time step. 10231 * The runnable will be run on the user interface thread.</p> 10232 * 10233 * <p>This method can be invoked from outside of the UI thread 10234 * only when this View is attached to a window.</p> 10235 * 10236 * @param action The Runnable that will be executed. 10237 * 10238 * @see #postOnAnimationDelayed 10239 * @see #removeCallbacks 10240 */ 10241 public void postOnAnimation(Runnable action) { 10242 final AttachInfo attachInfo = mAttachInfo; 10243 if (attachInfo != null) { 10244 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10245 Choreographer.CALLBACK_ANIMATION, action, null); 10246 } else { 10247 // Assume that post will succeed later 10248 ViewRootImpl.getRunQueue().post(action); 10249 } 10250 } 10251 10252 /** 10253 * <p>Causes the Runnable to execute on the next animation time step, 10254 * after the specified amount of time elapses. 10255 * The runnable will be run on the user interface thread.</p> 10256 * 10257 * <p>This method can be invoked from outside of the UI thread 10258 * only when this View is attached to a window.</p> 10259 * 10260 * @param action The Runnable that will be executed. 10261 * @param delayMillis The delay (in milliseconds) until the Runnable 10262 * will be executed. 10263 * 10264 * @see #postOnAnimation 10265 * @see #removeCallbacks 10266 */ 10267 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10268 final AttachInfo attachInfo = mAttachInfo; 10269 if (attachInfo != null) { 10270 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10271 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10272 } else { 10273 // Assume that post will succeed later 10274 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10275 } 10276 } 10277 10278 /** 10279 * <p>Removes the specified Runnable from the message queue.</p> 10280 * 10281 * <p>This method can be invoked from outside of the UI thread 10282 * only when this View is attached to a window.</p> 10283 * 10284 * @param action The Runnable to remove from the message handling queue 10285 * 10286 * @return true if this view could ask the Handler to remove the Runnable, 10287 * false otherwise. When the returned value is true, the Runnable 10288 * may or may not have been actually removed from the message queue 10289 * (for instance, if the Runnable was not in the queue already.) 10290 * 10291 * @see #post 10292 * @see #postDelayed 10293 * @see #postOnAnimation 10294 * @see #postOnAnimationDelayed 10295 */ 10296 public boolean removeCallbacks(Runnable action) { 10297 if (action != null) { 10298 final AttachInfo attachInfo = mAttachInfo; 10299 if (attachInfo != null) { 10300 attachInfo.mHandler.removeCallbacks(action); 10301 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10302 Choreographer.CALLBACK_ANIMATION, action, null); 10303 } else { 10304 // Assume that post will succeed later 10305 ViewRootImpl.getRunQueue().removeCallbacks(action); 10306 } 10307 } 10308 return true; 10309 } 10310 10311 /** 10312 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10313 * Use this to invalidate the View from a non-UI thread.</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 * @see #invalidate() 10319 * @see #postInvalidateDelayed(long) 10320 */ 10321 public void postInvalidate() { 10322 postInvalidateDelayed(0); 10323 } 10324 10325 /** 10326 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10327 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10328 * 10329 * <p>This method can be invoked from outside of the UI thread 10330 * only when this View is attached to a window.</p> 10331 * 10332 * @param left The left coordinate of the rectangle to invalidate. 10333 * @param top The top coordinate of the rectangle to invalidate. 10334 * @param right The right coordinate of the rectangle to invalidate. 10335 * @param bottom The bottom coordinate of the rectangle to invalidate. 10336 * 10337 * @see #invalidate(int, int, int, int) 10338 * @see #invalidate(Rect) 10339 * @see #postInvalidateDelayed(long, int, int, int, int) 10340 */ 10341 public void postInvalidate(int left, int top, int right, int bottom) { 10342 postInvalidateDelayed(0, left, top, right, bottom); 10343 } 10344 10345 /** 10346 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10347 * loop. Waits for the specified amount of time.</p> 10348 * 10349 * <p>This method can be invoked from outside of the UI thread 10350 * only when this View is attached to a window.</p> 10351 * 10352 * @param delayMilliseconds the duration in milliseconds to delay the 10353 * invalidation by 10354 * 10355 * @see #invalidate() 10356 * @see #postInvalidate() 10357 */ 10358 public void postInvalidateDelayed(long delayMilliseconds) { 10359 // We try only with the AttachInfo because there's no point in invalidating 10360 // if we are not attached to our window 10361 final AttachInfo attachInfo = mAttachInfo; 10362 if (attachInfo != null) { 10363 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10364 } 10365 } 10366 10367 /** 10368 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10369 * through the event loop. Waits for the specified amount of time.</p> 10370 * 10371 * <p>This method can be invoked from outside of the UI thread 10372 * only when this View is attached to a window.</p> 10373 * 10374 * @param delayMilliseconds the duration in milliseconds to delay the 10375 * invalidation by 10376 * @param left The left coordinate of the rectangle to invalidate. 10377 * @param top The top coordinate of the rectangle to invalidate. 10378 * @param right The right coordinate of the rectangle to invalidate. 10379 * @param bottom The bottom coordinate of the rectangle to invalidate. 10380 * 10381 * @see #invalidate(int, int, int, int) 10382 * @see #invalidate(Rect) 10383 * @see #postInvalidate(int, int, int, int) 10384 */ 10385 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10386 int right, int bottom) { 10387 10388 // We try only with the AttachInfo because there's no point in invalidating 10389 // if we are not attached to our window 10390 final AttachInfo attachInfo = mAttachInfo; 10391 if (attachInfo != null) { 10392 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10393 info.target = this; 10394 info.left = left; 10395 info.top = top; 10396 info.right = right; 10397 info.bottom = bottom; 10398 10399 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10400 } 10401 } 10402 10403 /** 10404 * <p>Cause an invalidate to happen on the next animation time step, typically the 10405 * next display frame.</p> 10406 * 10407 * <p>This method can be invoked from outside of the UI thread 10408 * only when this View is attached to a window.</p> 10409 * 10410 * @see #invalidate() 10411 */ 10412 public void postInvalidateOnAnimation() { 10413 // We try only with the AttachInfo because there's no point in invalidating 10414 // if we are not attached to our window 10415 final AttachInfo attachInfo = mAttachInfo; 10416 if (attachInfo != null) { 10417 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10418 } 10419 } 10420 10421 /** 10422 * <p>Cause an invalidate of the specified area to happen on the next animation 10423 * time step, typically the next display frame.</p> 10424 * 10425 * <p>This method can be invoked from outside of the UI thread 10426 * only when this View is attached to a window.</p> 10427 * 10428 * @param left The left coordinate of the rectangle to invalidate. 10429 * @param top The top coordinate of the rectangle to invalidate. 10430 * @param right The right coordinate of the rectangle to invalidate. 10431 * @param bottom The bottom coordinate of the rectangle to invalidate. 10432 * 10433 * @see #invalidate(int, int, int, int) 10434 * @see #invalidate(Rect) 10435 */ 10436 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10437 // We try only with the AttachInfo because there's no point in invalidating 10438 // if we are not attached to our window 10439 final AttachInfo attachInfo = mAttachInfo; 10440 if (attachInfo != null) { 10441 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10442 info.target = this; 10443 info.left = left; 10444 info.top = top; 10445 info.right = right; 10446 info.bottom = bottom; 10447 10448 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10449 } 10450 } 10451 10452 /** 10453 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10454 * This event is sent at most once every 10455 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10456 */ 10457 private void postSendViewScrolledAccessibilityEventCallback() { 10458 if (mSendViewScrolledAccessibilityEvent == null) { 10459 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10460 } 10461 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10462 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10463 postDelayed(mSendViewScrolledAccessibilityEvent, 10464 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10465 } 10466 } 10467 10468 /** 10469 * Called by a parent to request that a child update its values for mScrollX 10470 * and mScrollY if necessary. This will typically be done if the child is 10471 * animating a scroll using a {@link android.widget.Scroller Scroller} 10472 * object. 10473 */ 10474 public void computeScroll() { 10475 } 10476 10477 /** 10478 * <p>Indicate whether the horizontal edges are faded when the view is 10479 * scrolled horizontally.</p> 10480 * 10481 * @return true if the horizontal edges should are faded on scroll, false 10482 * otherwise 10483 * 10484 * @see #setHorizontalFadingEdgeEnabled(boolean) 10485 * 10486 * @attr ref android.R.styleable#View_requiresFadingEdge 10487 */ 10488 public boolean isHorizontalFadingEdgeEnabled() { 10489 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10490 } 10491 10492 /** 10493 * <p>Define whether the horizontal edges should be faded when this view 10494 * is scrolled horizontally.</p> 10495 * 10496 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10497 * be faded when the view is scrolled 10498 * horizontally 10499 * 10500 * @see #isHorizontalFadingEdgeEnabled() 10501 * 10502 * @attr ref android.R.styleable#View_requiresFadingEdge 10503 */ 10504 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10505 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10506 if (horizontalFadingEdgeEnabled) { 10507 initScrollCache(); 10508 } 10509 10510 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10511 } 10512 } 10513 10514 /** 10515 * <p>Indicate whether the vertical edges are faded when the view is 10516 * scrolled horizontally.</p> 10517 * 10518 * @return true if the vertical edges should are faded on scroll, false 10519 * otherwise 10520 * 10521 * @see #setVerticalFadingEdgeEnabled(boolean) 10522 * 10523 * @attr ref android.R.styleable#View_requiresFadingEdge 10524 */ 10525 public boolean isVerticalFadingEdgeEnabled() { 10526 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10527 } 10528 10529 /** 10530 * <p>Define whether the vertical edges should be faded when this view 10531 * is scrolled vertically.</p> 10532 * 10533 * @param verticalFadingEdgeEnabled true if the vertical edges should 10534 * be faded when the view is scrolled 10535 * vertically 10536 * 10537 * @see #isVerticalFadingEdgeEnabled() 10538 * 10539 * @attr ref android.R.styleable#View_requiresFadingEdge 10540 */ 10541 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10542 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10543 if (verticalFadingEdgeEnabled) { 10544 initScrollCache(); 10545 } 10546 10547 mViewFlags ^= FADING_EDGE_VERTICAL; 10548 } 10549 } 10550 10551 /** 10552 * Returns the strength, or intensity, of the top faded edge. The strength is 10553 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10554 * returns 0.0 or 1.0 but no value in between. 10555 * 10556 * Subclasses should override this method to provide a smoother fade transition 10557 * when scrolling occurs. 10558 * 10559 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10560 */ 10561 protected float getTopFadingEdgeStrength() { 10562 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10563 } 10564 10565 /** 10566 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10567 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10568 * returns 0.0 or 1.0 but no value in between. 10569 * 10570 * Subclasses should override this method to provide a smoother fade transition 10571 * when scrolling occurs. 10572 * 10573 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10574 */ 10575 protected float getBottomFadingEdgeStrength() { 10576 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10577 computeVerticalScrollRange() ? 1.0f : 0.0f; 10578 } 10579 10580 /** 10581 * Returns the strength, or intensity, of the left faded edge. The strength is 10582 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10583 * returns 0.0 or 1.0 but no value in between. 10584 * 10585 * Subclasses should override this method to provide a smoother fade transition 10586 * when scrolling occurs. 10587 * 10588 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10589 */ 10590 protected float getLeftFadingEdgeStrength() { 10591 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10592 } 10593 10594 /** 10595 * Returns the strength, or intensity, of the right faded edge. The strength is 10596 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10597 * returns 0.0 or 1.0 but no value in between. 10598 * 10599 * Subclasses should override this method to provide a smoother fade transition 10600 * when scrolling occurs. 10601 * 10602 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10603 */ 10604 protected float getRightFadingEdgeStrength() { 10605 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10606 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10607 } 10608 10609 /** 10610 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10611 * scrollbar is not drawn by default.</p> 10612 * 10613 * @return true if the horizontal scrollbar should be painted, false 10614 * otherwise 10615 * 10616 * @see #setHorizontalScrollBarEnabled(boolean) 10617 */ 10618 public boolean isHorizontalScrollBarEnabled() { 10619 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10620 } 10621 10622 /** 10623 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10624 * scrollbar is not drawn by default.</p> 10625 * 10626 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10627 * be painted 10628 * 10629 * @see #isHorizontalScrollBarEnabled() 10630 */ 10631 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10632 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10633 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10634 computeOpaqueFlags(); 10635 resolvePadding(); 10636 } 10637 } 10638 10639 /** 10640 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10641 * scrollbar is not drawn by default.</p> 10642 * 10643 * @return true if the vertical scrollbar should be painted, false 10644 * otherwise 10645 * 10646 * @see #setVerticalScrollBarEnabled(boolean) 10647 */ 10648 public boolean isVerticalScrollBarEnabled() { 10649 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10650 } 10651 10652 /** 10653 * <p>Define whether the vertical scrollbar should be drawn or not. The 10654 * scrollbar is not drawn by default.</p> 10655 * 10656 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10657 * be painted 10658 * 10659 * @see #isVerticalScrollBarEnabled() 10660 */ 10661 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10662 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10663 mViewFlags ^= SCROLLBARS_VERTICAL; 10664 computeOpaqueFlags(); 10665 resolvePadding(); 10666 } 10667 } 10668 10669 /** 10670 * @hide 10671 */ 10672 protected void recomputePadding() { 10673 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10674 } 10675 10676 /** 10677 * Define whether scrollbars will fade when the view is not scrolling. 10678 * 10679 * @param fadeScrollbars wheter to enable fading 10680 * 10681 * @attr ref android.R.styleable#View_fadeScrollbars 10682 */ 10683 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10684 initScrollCache(); 10685 final ScrollabilityCache scrollabilityCache = mScrollCache; 10686 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10687 if (fadeScrollbars) { 10688 scrollabilityCache.state = ScrollabilityCache.OFF; 10689 } else { 10690 scrollabilityCache.state = ScrollabilityCache.ON; 10691 } 10692 } 10693 10694 /** 10695 * 10696 * Returns true if scrollbars will fade when this view is not scrolling 10697 * 10698 * @return true if scrollbar fading is enabled 10699 * 10700 * @attr ref android.R.styleable#View_fadeScrollbars 10701 */ 10702 public boolean isScrollbarFadingEnabled() { 10703 return mScrollCache != null && mScrollCache.fadeScrollBars; 10704 } 10705 10706 /** 10707 * 10708 * Returns the delay before scrollbars fade. 10709 * 10710 * @return the delay before scrollbars fade 10711 * 10712 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10713 */ 10714 public int getScrollBarDefaultDelayBeforeFade() { 10715 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10716 mScrollCache.scrollBarDefaultDelayBeforeFade; 10717 } 10718 10719 /** 10720 * Define the delay before scrollbars fade. 10721 * 10722 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10723 * 10724 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10725 */ 10726 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10727 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10728 } 10729 10730 /** 10731 * 10732 * Returns the scrollbar fade duration. 10733 * 10734 * @return the scrollbar fade duration 10735 * 10736 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10737 */ 10738 public int getScrollBarFadeDuration() { 10739 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10740 mScrollCache.scrollBarFadeDuration; 10741 } 10742 10743 /** 10744 * Define the scrollbar fade duration. 10745 * 10746 * @param scrollBarFadeDuration - the scrollbar fade duration 10747 * 10748 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10749 */ 10750 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10751 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10752 } 10753 10754 /** 10755 * 10756 * Returns the scrollbar size. 10757 * 10758 * @return the scrollbar size 10759 * 10760 * @attr ref android.R.styleable#View_scrollbarSize 10761 */ 10762 public int getScrollBarSize() { 10763 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10764 mScrollCache.scrollBarSize; 10765 } 10766 10767 /** 10768 * Define the scrollbar size. 10769 * 10770 * @param scrollBarSize - the scrollbar size 10771 * 10772 * @attr ref android.R.styleable#View_scrollbarSize 10773 */ 10774 public void setScrollBarSize(int scrollBarSize) { 10775 getScrollCache().scrollBarSize = scrollBarSize; 10776 } 10777 10778 /** 10779 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10780 * inset. When inset, they add to the padding of the view. And the scrollbars 10781 * can be drawn inside the padding area or on the edge of the view. For example, 10782 * if a view has a background drawable and you want to draw the scrollbars 10783 * inside the padding specified by the drawable, you can use 10784 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10785 * appear at the edge of the view, ignoring the padding, then you can use 10786 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10787 * @param style the style of the scrollbars. Should be one of 10788 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10789 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10790 * @see #SCROLLBARS_INSIDE_OVERLAY 10791 * @see #SCROLLBARS_INSIDE_INSET 10792 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10793 * @see #SCROLLBARS_OUTSIDE_INSET 10794 * 10795 * @attr ref android.R.styleable#View_scrollbarStyle 10796 */ 10797 public void setScrollBarStyle(int style) { 10798 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10799 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10800 computeOpaqueFlags(); 10801 resolvePadding(); 10802 } 10803 } 10804 10805 /** 10806 * <p>Returns the current scrollbar style.</p> 10807 * @return the current scrollbar style 10808 * @see #SCROLLBARS_INSIDE_OVERLAY 10809 * @see #SCROLLBARS_INSIDE_INSET 10810 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10811 * @see #SCROLLBARS_OUTSIDE_INSET 10812 * 10813 * @attr ref android.R.styleable#View_scrollbarStyle 10814 */ 10815 @ViewDebug.ExportedProperty(mapping = { 10816 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10817 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10818 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10819 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10820 }) 10821 public int getScrollBarStyle() { 10822 return mViewFlags & SCROLLBARS_STYLE_MASK; 10823 } 10824 10825 /** 10826 * <p>Compute the horizontal range that the horizontal scrollbar 10827 * represents.</p> 10828 * 10829 * <p>The range is expressed in arbitrary units that must be the same as the 10830 * units used by {@link #computeHorizontalScrollExtent()} and 10831 * {@link #computeHorizontalScrollOffset()}.</p> 10832 * 10833 * <p>The default range is the drawing width of this view.</p> 10834 * 10835 * @return the total horizontal range represented by the horizontal 10836 * scrollbar 10837 * 10838 * @see #computeHorizontalScrollExtent() 10839 * @see #computeHorizontalScrollOffset() 10840 * @see android.widget.ScrollBarDrawable 10841 */ 10842 protected int computeHorizontalScrollRange() { 10843 return getWidth(); 10844 } 10845 10846 /** 10847 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10848 * within the horizontal range. This value is used to compute the position 10849 * of the thumb within the scrollbar's track.</p> 10850 * 10851 * <p>The range is expressed in arbitrary units that must be the same as the 10852 * units used by {@link #computeHorizontalScrollRange()} and 10853 * {@link #computeHorizontalScrollExtent()}.</p> 10854 * 10855 * <p>The default offset is the scroll offset of this view.</p> 10856 * 10857 * @return the horizontal offset of the scrollbar's thumb 10858 * 10859 * @see #computeHorizontalScrollRange() 10860 * @see #computeHorizontalScrollExtent() 10861 * @see android.widget.ScrollBarDrawable 10862 */ 10863 protected int computeHorizontalScrollOffset() { 10864 return mScrollX; 10865 } 10866 10867 /** 10868 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10869 * within the horizontal range. This value is used to compute the length 10870 * of the thumb within the scrollbar's track.</p> 10871 * 10872 * <p>The range is expressed in arbitrary units that must be the same as the 10873 * units used by {@link #computeHorizontalScrollRange()} and 10874 * {@link #computeHorizontalScrollOffset()}.</p> 10875 * 10876 * <p>The default extent is the drawing width of this view.</p> 10877 * 10878 * @return the horizontal extent of the scrollbar's thumb 10879 * 10880 * @see #computeHorizontalScrollRange() 10881 * @see #computeHorizontalScrollOffset() 10882 * @see android.widget.ScrollBarDrawable 10883 */ 10884 protected int computeHorizontalScrollExtent() { 10885 return getWidth(); 10886 } 10887 10888 /** 10889 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10890 * 10891 * <p>The range is expressed in arbitrary units that must be the same as the 10892 * units used by {@link #computeVerticalScrollExtent()} and 10893 * {@link #computeVerticalScrollOffset()}.</p> 10894 * 10895 * @return the total vertical range represented by the vertical scrollbar 10896 * 10897 * <p>The default range is the drawing height of this view.</p> 10898 * 10899 * @see #computeVerticalScrollExtent() 10900 * @see #computeVerticalScrollOffset() 10901 * @see android.widget.ScrollBarDrawable 10902 */ 10903 protected int computeVerticalScrollRange() { 10904 return getHeight(); 10905 } 10906 10907 /** 10908 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10909 * within the horizontal range. This value is used to compute the position 10910 * of the thumb within the scrollbar's track.</p> 10911 * 10912 * <p>The range is expressed in arbitrary units that must be the same as the 10913 * units used by {@link #computeVerticalScrollRange()} and 10914 * {@link #computeVerticalScrollExtent()}.</p> 10915 * 10916 * <p>The default offset is the scroll offset of this view.</p> 10917 * 10918 * @return the vertical offset of the scrollbar's thumb 10919 * 10920 * @see #computeVerticalScrollRange() 10921 * @see #computeVerticalScrollExtent() 10922 * @see android.widget.ScrollBarDrawable 10923 */ 10924 protected int computeVerticalScrollOffset() { 10925 return mScrollY; 10926 } 10927 10928 /** 10929 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10930 * within the vertical range. This value is used to compute the length 10931 * of the thumb within the scrollbar's track.</p> 10932 * 10933 * <p>The range is expressed in arbitrary units that must be the same as the 10934 * units used by {@link #computeVerticalScrollRange()} and 10935 * {@link #computeVerticalScrollOffset()}.</p> 10936 * 10937 * <p>The default extent is the drawing height of this view.</p> 10938 * 10939 * @return the vertical extent of the scrollbar's thumb 10940 * 10941 * @see #computeVerticalScrollRange() 10942 * @see #computeVerticalScrollOffset() 10943 * @see android.widget.ScrollBarDrawable 10944 */ 10945 protected int computeVerticalScrollExtent() { 10946 return getHeight(); 10947 } 10948 10949 /** 10950 * Check if this view can be scrolled horizontally in a certain direction. 10951 * 10952 * @param direction Negative to check scrolling left, positive to check scrolling right. 10953 * @return true if this view can be scrolled in the specified direction, false otherwise. 10954 */ 10955 public boolean canScrollHorizontally(int direction) { 10956 final int offset = computeHorizontalScrollOffset(); 10957 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10958 if (range == 0) return false; 10959 if (direction < 0) { 10960 return offset > 0; 10961 } else { 10962 return offset < range - 1; 10963 } 10964 } 10965 10966 /** 10967 * Check if this view can be scrolled vertically in a certain direction. 10968 * 10969 * @param direction Negative to check scrolling up, positive to check scrolling down. 10970 * @return true if this view can be scrolled in the specified direction, false otherwise. 10971 */ 10972 public boolean canScrollVertically(int direction) { 10973 final int offset = computeVerticalScrollOffset(); 10974 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10975 if (range == 0) return false; 10976 if (direction < 0) { 10977 return offset > 0; 10978 } else { 10979 return offset < range - 1; 10980 } 10981 } 10982 10983 /** 10984 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10985 * scrollbars are painted only if they have been awakened first.</p> 10986 * 10987 * @param canvas the canvas on which to draw the scrollbars 10988 * 10989 * @see #awakenScrollBars(int) 10990 */ 10991 protected final void onDrawScrollBars(Canvas canvas) { 10992 // scrollbars are drawn only when the animation is running 10993 final ScrollabilityCache cache = mScrollCache; 10994 if (cache != null) { 10995 10996 int state = cache.state; 10997 10998 if (state == ScrollabilityCache.OFF) { 10999 return; 11000 } 11001 11002 boolean invalidate = false; 11003 11004 if (state == ScrollabilityCache.FADING) { 11005 // We're fading -- get our fade interpolation 11006 if (cache.interpolatorValues == null) { 11007 cache.interpolatorValues = new float[1]; 11008 } 11009 11010 float[] values = cache.interpolatorValues; 11011 11012 // Stops the animation if we're done 11013 if (cache.scrollBarInterpolator.timeToValues(values) == 11014 Interpolator.Result.FREEZE_END) { 11015 cache.state = ScrollabilityCache.OFF; 11016 } else { 11017 cache.scrollBar.setAlpha(Math.round(values[0])); 11018 } 11019 11020 // This will make the scroll bars inval themselves after 11021 // drawing. We only want this when we're fading so that 11022 // we prevent excessive redraws 11023 invalidate = true; 11024 } else { 11025 // We're just on -- but we may have been fading before so 11026 // reset alpha 11027 cache.scrollBar.setAlpha(255); 11028 } 11029 11030 11031 final int viewFlags = mViewFlags; 11032 11033 final boolean drawHorizontalScrollBar = 11034 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11035 final boolean drawVerticalScrollBar = 11036 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11037 && !isVerticalScrollBarHidden(); 11038 11039 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11040 final int width = mRight - mLeft; 11041 final int height = mBottom - mTop; 11042 11043 final ScrollBarDrawable scrollBar = cache.scrollBar; 11044 11045 final int scrollX = mScrollX; 11046 final int scrollY = mScrollY; 11047 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11048 11049 int left, top, right, bottom; 11050 11051 if (drawHorizontalScrollBar) { 11052 int size = scrollBar.getSize(false); 11053 if (size <= 0) { 11054 size = cache.scrollBarSize; 11055 } 11056 11057 scrollBar.setParameters(computeHorizontalScrollRange(), 11058 computeHorizontalScrollOffset(), 11059 computeHorizontalScrollExtent(), false); 11060 final int verticalScrollBarGap = drawVerticalScrollBar ? 11061 getVerticalScrollbarWidth() : 0; 11062 top = scrollY + height - size - (mUserPaddingBottom & inside); 11063 left = scrollX + (mPaddingLeft & inside); 11064 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11065 bottom = top + size; 11066 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11067 if (invalidate) { 11068 invalidate(left, top, right, bottom); 11069 } 11070 } 11071 11072 if (drawVerticalScrollBar) { 11073 int size = scrollBar.getSize(true); 11074 if (size <= 0) { 11075 size = cache.scrollBarSize; 11076 } 11077 11078 scrollBar.setParameters(computeVerticalScrollRange(), 11079 computeVerticalScrollOffset(), 11080 computeVerticalScrollExtent(), true); 11081 switch (mVerticalScrollbarPosition) { 11082 default: 11083 case SCROLLBAR_POSITION_DEFAULT: 11084 case SCROLLBAR_POSITION_RIGHT: 11085 left = scrollX + width - size - (mUserPaddingRight & inside); 11086 break; 11087 case SCROLLBAR_POSITION_LEFT: 11088 left = scrollX + (mUserPaddingLeft & inside); 11089 break; 11090 } 11091 top = scrollY + (mPaddingTop & inside); 11092 right = left + size; 11093 bottom = scrollY + height - (mUserPaddingBottom & inside); 11094 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11095 if (invalidate) { 11096 invalidate(left, top, right, bottom); 11097 } 11098 } 11099 } 11100 } 11101 } 11102 11103 /** 11104 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11105 * FastScroller is visible. 11106 * @return whether to temporarily hide the vertical scrollbar 11107 * @hide 11108 */ 11109 protected boolean isVerticalScrollBarHidden() { 11110 return false; 11111 } 11112 11113 /** 11114 * <p>Draw the horizontal scrollbar if 11115 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11116 * 11117 * @param canvas the canvas on which to draw the scrollbar 11118 * @param scrollBar the scrollbar's drawable 11119 * 11120 * @see #isHorizontalScrollBarEnabled() 11121 * @see #computeHorizontalScrollRange() 11122 * @see #computeHorizontalScrollExtent() 11123 * @see #computeHorizontalScrollOffset() 11124 * @see android.widget.ScrollBarDrawable 11125 * @hide 11126 */ 11127 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11128 int l, int t, int r, int b) { 11129 scrollBar.setBounds(l, t, r, b); 11130 scrollBar.draw(canvas); 11131 } 11132 11133 /** 11134 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11135 * returns true.</p> 11136 * 11137 * @param canvas the canvas on which to draw the scrollbar 11138 * @param scrollBar the scrollbar's drawable 11139 * 11140 * @see #isVerticalScrollBarEnabled() 11141 * @see #computeVerticalScrollRange() 11142 * @see #computeVerticalScrollExtent() 11143 * @see #computeVerticalScrollOffset() 11144 * @see android.widget.ScrollBarDrawable 11145 * @hide 11146 */ 11147 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11148 int l, int t, int r, int b) { 11149 scrollBar.setBounds(l, t, r, b); 11150 scrollBar.draw(canvas); 11151 } 11152 11153 /** 11154 * Implement this to do your drawing. 11155 * 11156 * @param canvas the canvas on which the background will be drawn 11157 */ 11158 protected void onDraw(Canvas canvas) { 11159 } 11160 11161 /* 11162 * Caller is responsible for calling requestLayout if necessary. 11163 * (This allows addViewInLayout to not request a new layout.) 11164 */ 11165 void assignParent(ViewParent parent) { 11166 if (mParent == null) { 11167 mParent = parent; 11168 } else if (parent == null) { 11169 mParent = null; 11170 } else { 11171 throw new RuntimeException("view " + this + " being added, but" 11172 + " it already has a parent"); 11173 } 11174 } 11175 11176 /** 11177 * This is called when the view is attached to a window. At this point it 11178 * has a Surface and will start drawing. Note that this function is 11179 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11180 * however it may be called any time before the first onDraw -- including 11181 * before or after {@link #onMeasure(int, int)}. 11182 * 11183 * @see #onDetachedFromWindow() 11184 */ 11185 protected void onAttachedToWindow() { 11186 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11187 mParent.requestTransparentRegion(this); 11188 } 11189 11190 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11191 initialAwakenScrollBars(); 11192 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11193 } 11194 11195 jumpDrawablesToCurrentState(); 11196 11197 // Order is important here: LayoutDirection MUST be resolved before Padding 11198 // and TextDirection 11199 resolveLayoutDirection(); 11200 resolvePadding(); 11201 resolveTextDirection(); 11202 resolveTextAlignment(); 11203 11204 clearAccessibilityFocus(); 11205 if (isFocused()) { 11206 InputMethodManager imm = InputMethodManager.peekInstance(); 11207 imm.focusIn(this); 11208 } 11209 11210 if (mAttachInfo != null && mDisplayList != null) { 11211 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11212 } 11213 } 11214 11215 /** 11216 * @see #onScreenStateChanged(int) 11217 */ 11218 void dispatchScreenStateChanged(int screenState) { 11219 onScreenStateChanged(screenState); 11220 } 11221 11222 /** 11223 * This method is called whenever the state of the screen this view is 11224 * attached to changes. A state change will usually occurs when the screen 11225 * turns on or off (whether it happens automatically or the user does it 11226 * manually.) 11227 * 11228 * @param screenState The new state of the screen. Can be either 11229 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11230 */ 11231 public void onScreenStateChanged(int screenState) { 11232 } 11233 11234 /** 11235 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11236 */ 11237 private boolean hasRtlSupport() { 11238 return mContext.getApplicationInfo().hasRtlSupport(); 11239 } 11240 11241 /** 11242 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11243 * that the parent directionality can and will be resolved before its children. 11244 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11245 * @hide 11246 */ 11247 public void resolveLayoutDirection() { 11248 // Clear any previous layout direction resolution 11249 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11250 11251 if (hasRtlSupport()) { 11252 // Set resolved depending on layout direction 11253 switch (getLayoutDirection()) { 11254 case LAYOUT_DIRECTION_INHERIT: 11255 // If this is root view, no need to look at parent's layout dir. 11256 if (canResolveLayoutDirection()) { 11257 ViewGroup viewGroup = ((ViewGroup) mParent); 11258 11259 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11260 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11261 } 11262 } else { 11263 // Nothing to do, LTR by default 11264 } 11265 break; 11266 case LAYOUT_DIRECTION_RTL: 11267 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11268 break; 11269 case LAYOUT_DIRECTION_LOCALE: 11270 if(isLayoutDirectionRtl(Locale.getDefault())) { 11271 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11272 } 11273 break; 11274 default: 11275 // Nothing to do, LTR by default 11276 } 11277 } 11278 11279 // Set to resolved 11280 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11281 onResolvedLayoutDirectionChanged(); 11282 // Resolve padding 11283 resolvePadding(); 11284 } 11285 11286 /** 11287 * Called when layout direction has been resolved. 11288 * 11289 * The default implementation does nothing. 11290 * @hide 11291 */ 11292 public void onResolvedLayoutDirectionChanged() { 11293 } 11294 11295 /** 11296 * Resolve padding depending on layout direction. 11297 * @hide 11298 */ 11299 public void resolvePadding() { 11300 // If the user specified the absolute padding (either with android:padding or 11301 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11302 // use the default padding or the padding from the background drawable 11303 // (stored at this point in mPadding*) 11304 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11305 switch (resolvedLayoutDirection) { 11306 case LAYOUT_DIRECTION_RTL: 11307 // Start user padding override Right user padding. Otherwise, if Right user 11308 // padding is not defined, use the default Right padding. If Right user padding 11309 // is defined, just use it. 11310 if (mUserPaddingStart >= 0) { 11311 mUserPaddingRight = mUserPaddingStart; 11312 } else if (mUserPaddingRight < 0) { 11313 mUserPaddingRight = mPaddingRight; 11314 } 11315 if (mUserPaddingEnd >= 0) { 11316 mUserPaddingLeft = mUserPaddingEnd; 11317 } else if (mUserPaddingLeft < 0) { 11318 mUserPaddingLeft = mPaddingLeft; 11319 } 11320 break; 11321 case LAYOUT_DIRECTION_LTR: 11322 default: 11323 // Start user padding override Left user padding. Otherwise, if Left user 11324 // padding is not defined, use the default left padding. If Left user padding 11325 // is defined, just use it. 11326 if (mUserPaddingStart >= 0) { 11327 mUserPaddingLeft = mUserPaddingStart; 11328 } else if (mUserPaddingLeft < 0) { 11329 mUserPaddingLeft = mPaddingLeft; 11330 } 11331 if (mUserPaddingEnd >= 0) { 11332 mUserPaddingRight = mUserPaddingEnd; 11333 } else if (mUserPaddingRight < 0) { 11334 mUserPaddingRight = mPaddingRight; 11335 } 11336 } 11337 11338 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11339 11340 if(isPaddingRelative()) { 11341 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11342 } else { 11343 recomputePadding(); 11344 } 11345 onPaddingChanged(resolvedLayoutDirection); 11346 } 11347 11348 /** 11349 * Resolve padding depending on the layout direction. Subclasses that care about 11350 * padding resolution should override this method. The default implementation does 11351 * nothing. 11352 * 11353 * @param layoutDirection the direction of the layout 11354 * 11355 * @see {@link #LAYOUT_DIRECTION_LTR} 11356 * @see {@link #LAYOUT_DIRECTION_RTL} 11357 * @hide 11358 */ 11359 public void onPaddingChanged(int layoutDirection) { 11360 } 11361 11362 /** 11363 * Check if layout direction resolution can be done. 11364 * 11365 * @return true if layout direction resolution can be done otherwise return false. 11366 * @hide 11367 */ 11368 public boolean canResolveLayoutDirection() { 11369 switch (getLayoutDirection()) { 11370 case LAYOUT_DIRECTION_INHERIT: 11371 return (mParent != null) && (mParent instanceof ViewGroup); 11372 default: 11373 return true; 11374 } 11375 } 11376 11377 /** 11378 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11379 * when reset is done. 11380 * @hide 11381 */ 11382 public void resetResolvedLayoutDirection() { 11383 // Reset the current resolved bits 11384 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11385 onResolvedLayoutDirectionReset(); 11386 // Reset also the text direction 11387 resetResolvedTextDirection(); 11388 } 11389 11390 /** 11391 * Called during reset of resolved layout direction. 11392 * 11393 * Subclasses need to override this method to clear cached information that depends on the 11394 * resolved layout direction, or to inform child views that inherit their layout direction. 11395 * 11396 * The default implementation does nothing. 11397 * @hide 11398 */ 11399 public void onResolvedLayoutDirectionReset() { 11400 } 11401 11402 /** 11403 * Check if a Locale uses an RTL script. 11404 * 11405 * @param locale Locale to check 11406 * @return true if the Locale uses an RTL script. 11407 * @hide 11408 */ 11409 protected static boolean isLayoutDirectionRtl(Locale locale) { 11410 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11411 } 11412 11413 /** 11414 * This is called when the view is detached from a window. At this point it 11415 * no longer has a surface for drawing. 11416 * 11417 * @see #onAttachedToWindow() 11418 */ 11419 protected void onDetachedFromWindow() { 11420 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11421 11422 removeUnsetPressCallback(); 11423 removeLongPressCallback(); 11424 removePerformClickCallback(); 11425 removeSendViewScrolledAccessibilityEventCallback(); 11426 11427 destroyDrawingCache(); 11428 11429 destroyLayer(false); 11430 11431 if (mAttachInfo != null) { 11432 if (mDisplayList != null) { 11433 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11434 } 11435 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11436 } else { 11437 if (mDisplayList != null) { 11438 // Should never happen 11439 mDisplayList.invalidate(); 11440 } 11441 } 11442 11443 mCurrentAnimation = null; 11444 11445 resetResolvedLayoutDirection(); 11446 resetResolvedTextAlignment(); 11447 resetAccessibilityStateChanged(); 11448 } 11449 11450 /** 11451 * @return The number of times this view has been attached to a window 11452 */ 11453 protected int getWindowAttachCount() { 11454 return mWindowAttachCount; 11455 } 11456 11457 /** 11458 * Retrieve a unique token identifying the window this view is attached to. 11459 * @return Return the window's token for use in 11460 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11461 */ 11462 public IBinder getWindowToken() { 11463 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11464 } 11465 11466 /** 11467 * Retrieve a unique token identifying the top-level "real" window of 11468 * the window that this view is attached to. That is, this is like 11469 * {@link #getWindowToken}, except if the window this view in is a panel 11470 * window (attached to another containing window), then the token of 11471 * the containing window is returned instead. 11472 * 11473 * @return Returns the associated window token, either 11474 * {@link #getWindowToken()} or the containing window's token. 11475 */ 11476 public IBinder getApplicationWindowToken() { 11477 AttachInfo ai = mAttachInfo; 11478 if (ai != null) { 11479 IBinder appWindowToken = ai.mPanelParentWindowToken; 11480 if (appWindowToken == null) { 11481 appWindowToken = ai.mWindowToken; 11482 } 11483 return appWindowToken; 11484 } 11485 return null; 11486 } 11487 11488 /** 11489 * Retrieve private session object this view hierarchy is using to 11490 * communicate with the window manager. 11491 * @return the session object to communicate with the window manager 11492 */ 11493 /*package*/ IWindowSession getWindowSession() { 11494 return mAttachInfo != null ? mAttachInfo.mSession : null; 11495 } 11496 11497 /** 11498 * @param info the {@link android.view.View.AttachInfo} to associated with 11499 * this view 11500 */ 11501 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11502 //System.out.println("Attached! " + this); 11503 mAttachInfo = info; 11504 mWindowAttachCount++; 11505 // We will need to evaluate the drawable state at least once. 11506 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11507 if (mFloatingTreeObserver != null) { 11508 info.mTreeObserver.merge(mFloatingTreeObserver); 11509 mFloatingTreeObserver = null; 11510 } 11511 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11512 mAttachInfo.mScrollContainers.add(this); 11513 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11514 } 11515 performCollectViewAttributes(mAttachInfo, visibility); 11516 onAttachedToWindow(); 11517 11518 ListenerInfo li = mListenerInfo; 11519 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11520 li != null ? li.mOnAttachStateChangeListeners : null; 11521 if (listeners != null && listeners.size() > 0) { 11522 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11523 // perform the dispatching. The iterator is a safe guard against listeners that 11524 // could mutate the list by calling the various add/remove methods. This prevents 11525 // the array from being modified while we iterate it. 11526 for (OnAttachStateChangeListener listener : listeners) { 11527 listener.onViewAttachedToWindow(this); 11528 } 11529 } 11530 11531 int vis = info.mWindowVisibility; 11532 if (vis != GONE) { 11533 onWindowVisibilityChanged(vis); 11534 } 11535 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11536 // If nobody has evaluated the drawable state yet, then do it now. 11537 refreshDrawableState(); 11538 } 11539 } 11540 11541 void dispatchDetachedFromWindow() { 11542 AttachInfo info = mAttachInfo; 11543 if (info != null) { 11544 int vis = info.mWindowVisibility; 11545 if (vis != GONE) { 11546 onWindowVisibilityChanged(GONE); 11547 } 11548 } 11549 11550 onDetachedFromWindow(); 11551 11552 ListenerInfo li = mListenerInfo; 11553 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11554 li != null ? li.mOnAttachStateChangeListeners : null; 11555 if (listeners != null && listeners.size() > 0) { 11556 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11557 // perform the dispatching. The iterator is a safe guard against listeners that 11558 // could mutate the list by calling the various add/remove methods. This prevents 11559 // the array from being modified while we iterate it. 11560 for (OnAttachStateChangeListener listener : listeners) { 11561 listener.onViewDetachedFromWindow(this); 11562 } 11563 } 11564 11565 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11566 mAttachInfo.mScrollContainers.remove(this); 11567 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11568 } 11569 11570 mAttachInfo = null; 11571 } 11572 11573 /** 11574 * Store this view hierarchy's frozen state into the given container. 11575 * 11576 * @param container The SparseArray in which to save the view's state. 11577 * 11578 * @see #restoreHierarchyState(android.util.SparseArray) 11579 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11580 * @see #onSaveInstanceState() 11581 */ 11582 public void saveHierarchyState(SparseArray<Parcelable> container) { 11583 dispatchSaveInstanceState(container); 11584 } 11585 11586 /** 11587 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11588 * this view and its children. May be overridden to modify how freezing happens to a 11589 * view's children; for example, some views may want to not store state for their children. 11590 * 11591 * @param container The SparseArray in which to save the view's state. 11592 * 11593 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11594 * @see #saveHierarchyState(android.util.SparseArray) 11595 * @see #onSaveInstanceState() 11596 */ 11597 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11598 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11599 mPrivateFlags &= ~SAVE_STATE_CALLED; 11600 Parcelable state = onSaveInstanceState(); 11601 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11602 throw new IllegalStateException( 11603 "Derived class did not call super.onSaveInstanceState()"); 11604 } 11605 if (state != null) { 11606 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11607 // + ": " + state); 11608 container.put(mID, state); 11609 } 11610 } 11611 } 11612 11613 /** 11614 * Hook allowing a view to generate a representation of its internal state 11615 * that can later be used to create a new instance with that same state. 11616 * This state should only contain information that is not persistent or can 11617 * not be reconstructed later. For example, you will never store your 11618 * current position on screen because that will be computed again when a 11619 * new instance of the view is placed in its view hierarchy. 11620 * <p> 11621 * Some examples of things you may store here: the current cursor position 11622 * in a text view (but usually not the text itself since that is stored in a 11623 * content provider or other persistent storage), the currently selected 11624 * item in a list view. 11625 * 11626 * @return Returns a Parcelable object containing the view's current dynamic 11627 * state, or null if there is nothing interesting to save. The 11628 * default implementation returns null. 11629 * @see #onRestoreInstanceState(android.os.Parcelable) 11630 * @see #saveHierarchyState(android.util.SparseArray) 11631 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11632 * @see #setSaveEnabled(boolean) 11633 */ 11634 protected Parcelable onSaveInstanceState() { 11635 mPrivateFlags |= SAVE_STATE_CALLED; 11636 return BaseSavedState.EMPTY_STATE; 11637 } 11638 11639 /** 11640 * Restore this view hierarchy's frozen state from the given container. 11641 * 11642 * @param container The SparseArray which holds previously frozen states. 11643 * 11644 * @see #saveHierarchyState(android.util.SparseArray) 11645 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11646 * @see #onRestoreInstanceState(android.os.Parcelable) 11647 */ 11648 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11649 dispatchRestoreInstanceState(container); 11650 } 11651 11652 /** 11653 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11654 * state for this view and its children. May be overridden to modify how restoring 11655 * happens to a view's children; for example, some views may want to not store state 11656 * for their children. 11657 * 11658 * @param container The SparseArray which holds previously saved state. 11659 * 11660 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11661 * @see #restoreHierarchyState(android.util.SparseArray) 11662 * @see #onRestoreInstanceState(android.os.Parcelable) 11663 */ 11664 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11665 if (mID != NO_ID) { 11666 Parcelable state = container.get(mID); 11667 if (state != null) { 11668 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11669 // + ": " + state); 11670 mPrivateFlags &= ~SAVE_STATE_CALLED; 11671 onRestoreInstanceState(state); 11672 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11673 throw new IllegalStateException( 11674 "Derived class did not call super.onRestoreInstanceState()"); 11675 } 11676 } 11677 } 11678 } 11679 11680 /** 11681 * Hook allowing a view to re-apply a representation of its internal state that had previously 11682 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11683 * null state. 11684 * 11685 * @param state The frozen state that had previously been returned by 11686 * {@link #onSaveInstanceState}. 11687 * 11688 * @see #onSaveInstanceState() 11689 * @see #restoreHierarchyState(android.util.SparseArray) 11690 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11691 */ 11692 protected void onRestoreInstanceState(Parcelable state) { 11693 mPrivateFlags |= SAVE_STATE_CALLED; 11694 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11695 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11696 + "received " + state.getClass().toString() + " instead. This usually happens " 11697 + "when two views of different type have the same id in the same hierarchy. " 11698 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11699 + "other views do not use the same id."); 11700 } 11701 } 11702 11703 /** 11704 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11705 * 11706 * @return the drawing start time in milliseconds 11707 */ 11708 public long getDrawingTime() { 11709 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11710 } 11711 11712 /** 11713 * <p>Enables or disables the duplication of the parent's state into this view. When 11714 * duplication is enabled, this view gets its drawable state from its parent rather 11715 * than from its own internal properties.</p> 11716 * 11717 * <p>Note: in the current implementation, setting this property to true after the 11718 * view was added to a ViewGroup might have no effect at all. This property should 11719 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11720 * 11721 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11722 * property is enabled, an exception will be thrown.</p> 11723 * 11724 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11725 * parent, these states should not be affected by this method.</p> 11726 * 11727 * @param enabled True to enable duplication of the parent's drawable state, false 11728 * to disable it. 11729 * 11730 * @see #getDrawableState() 11731 * @see #isDuplicateParentStateEnabled() 11732 */ 11733 public void setDuplicateParentStateEnabled(boolean enabled) { 11734 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11735 } 11736 11737 /** 11738 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11739 * 11740 * @return True if this view's drawable state is duplicated from the parent, 11741 * false otherwise 11742 * 11743 * @see #getDrawableState() 11744 * @see #setDuplicateParentStateEnabled(boolean) 11745 */ 11746 public boolean isDuplicateParentStateEnabled() { 11747 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11748 } 11749 11750 /** 11751 * <p>Specifies the type of layer backing this view. The layer can be 11752 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11753 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11754 * 11755 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11756 * instance that controls how the layer is composed on screen. The following 11757 * properties of the paint are taken into account when composing the layer:</p> 11758 * <ul> 11759 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11760 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11761 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11762 * </ul> 11763 * 11764 * <p>If this view has an alpha value set to < 1.0 by calling 11765 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11766 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11767 * equivalent to setting a hardware layer on this view and providing a paint with 11768 * the desired alpha value.<p> 11769 * 11770 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11771 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11772 * for more information on when and how to use layers.</p> 11773 * 11774 * @param layerType The ype of layer to use with this view, must be one of 11775 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11776 * {@link #LAYER_TYPE_HARDWARE} 11777 * @param paint The paint used to compose the layer. This argument is optional 11778 * and can be null. It is ignored when the layer type is 11779 * {@link #LAYER_TYPE_NONE} 11780 * 11781 * @see #getLayerType() 11782 * @see #LAYER_TYPE_NONE 11783 * @see #LAYER_TYPE_SOFTWARE 11784 * @see #LAYER_TYPE_HARDWARE 11785 * @see #setAlpha(float) 11786 * 11787 * @attr ref android.R.styleable#View_layerType 11788 */ 11789 public void setLayerType(int layerType, Paint paint) { 11790 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11791 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11792 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11793 } 11794 11795 if (layerType == mLayerType) { 11796 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11797 mLayerPaint = paint == null ? new Paint() : paint; 11798 invalidateParentCaches(); 11799 invalidate(true); 11800 } 11801 return; 11802 } 11803 11804 // Destroy any previous software drawing cache if needed 11805 switch (mLayerType) { 11806 case LAYER_TYPE_HARDWARE: 11807 destroyLayer(false); 11808 // fall through - non-accelerated views may use software layer mechanism instead 11809 case LAYER_TYPE_SOFTWARE: 11810 destroyDrawingCache(); 11811 break; 11812 default: 11813 break; 11814 } 11815 11816 mLayerType = layerType; 11817 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11818 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11819 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11820 11821 invalidateParentCaches(); 11822 invalidate(true); 11823 } 11824 11825 /** 11826 * Indicates whether this view has a static layer. A view with layer type 11827 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11828 * dynamic. 11829 */ 11830 boolean hasStaticLayer() { 11831 return true; 11832 } 11833 11834 /** 11835 * Indicates what type of layer is currently associated with this view. By default 11836 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11837 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11838 * for more information on the different types of layers. 11839 * 11840 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11841 * {@link #LAYER_TYPE_HARDWARE} 11842 * 11843 * @see #setLayerType(int, android.graphics.Paint) 11844 * @see #buildLayer() 11845 * @see #LAYER_TYPE_NONE 11846 * @see #LAYER_TYPE_SOFTWARE 11847 * @see #LAYER_TYPE_HARDWARE 11848 */ 11849 public int getLayerType() { 11850 return mLayerType; 11851 } 11852 11853 /** 11854 * Forces this view's layer to be created and this view to be rendered 11855 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11856 * invoking this method will have no effect. 11857 * 11858 * This method can for instance be used to render a view into its layer before 11859 * starting an animation. If this view is complex, rendering into the layer 11860 * before starting the animation will avoid skipping frames. 11861 * 11862 * @throws IllegalStateException If this view is not attached to a window 11863 * 11864 * @see #setLayerType(int, android.graphics.Paint) 11865 */ 11866 public void buildLayer() { 11867 if (mLayerType == LAYER_TYPE_NONE) return; 11868 11869 if (mAttachInfo == null) { 11870 throw new IllegalStateException("This view must be attached to a window first"); 11871 } 11872 11873 switch (mLayerType) { 11874 case LAYER_TYPE_HARDWARE: 11875 if (mAttachInfo.mHardwareRenderer != null && 11876 mAttachInfo.mHardwareRenderer.isEnabled() && 11877 mAttachInfo.mHardwareRenderer.validate()) { 11878 getHardwareLayer(); 11879 } 11880 break; 11881 case LAYER_TYPE_SOFTWARE: 11882 buildDrawingCache(true); 11883 break; 11884 } 11885 } 11886 11887 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11888 void flushLayer() { 11889 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11890 mHardwareLayer.flush(); 11891 } 11892 } 11893 11894 /** 11895 * <p>Returns a hardware layer that can be used to draw this view again 11896 * without executing its draw method.</p> 11897 * 11898 * @return A HardwareLayer ready to render, or null if an error occurred. 11899 */ 11900 HardwareLayer getHardwareLayer() { 11901 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11902 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11903 return null; 11904 } 11905 11906 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11907 11908 final int width = mRight - mLeft; 11909 final int height = mBottom - mTop; 11910 11911 if (width == 0 || height == 0) { 11912 return null; 11913 } 11914 11915 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11916 if (mHardwareLayer == null) { 11917 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11918 width, height, isOpaque()); 11919 mLocalDirtyRect.set(0, 0, width, height); 11920 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11921 mHardwareLayer.resize(width, height); 11922 mLocalDirtyRect.set(0, 0, width, height); 11923 } 11924 11925 // The layer is not valid if the underlying GPU resources cannot be allocated 11926 if (!mHardwareLayer.isValid()) { 11927 return null; 11928 } 11929 11930 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11931 mLocalDirtyRect.setEmpty(); 11932 } 11933 11934 return mHardwareLayer; 11935 } 11936 11937 /** 11938 * Destroys this View's hardware layer if possible. 11939 * 11940 * @return True if the layer was destroyed, false otherwise. 11941 * 11942 * @see #setLayerType(int, android.graphics.Paint) 11943 * @see #LAYER_TYPE_HARDWARE 11944 */ 11945 boolean destroyLayer(boolean valid) { 11946 if (mHardwareLayer != null) { 11947 AttachInfo info = mAttachInfo; 11948 if (info != null && info.mHardwareRenderer != null && 11949 info.mHardwareRenderer.isEnabled() && 11950 (valid || info.mHardwareRenderer.validate())) { 11951 mHardwareLayer.destroy(); 11952 mHardwareLayer = null; 11953 11954 invalidate(true); 11955 invalidateParentCaches(); 11956 } 11957 return true; 11958 } 11959 return false; 11960 } 11961 11962 /** 11963 * Destroys all hardware rendering resources. This method is invoked 11964 * when the system needs to reclaim resources. Upon execution of this 11965 * method, you should free any OpenGL resources created by the view. 11966 * 11967 * Note: you <strong>must</strong> call 11968 * <code>super.destroyHardwareResources()</code> when overriding 11969 * this method. 11970 * 11971 * @hide 11972 */ 11973 protected void destroyHardwareResources() { 11974 destroyLayer(true); 11975 } 11976 11977 /** 11978 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11979 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11980 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11981 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11982 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11983 * null.</p> 11984 * 11985 * <p>Enabling the drawing cache is similar to 11986 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11987 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11988 * drawing cache has no effect on rendering because the system uses a different mechanism 11989 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11990 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11991 * for information on how to enable software and hardware layers.</p> 11992 * 11993 * <p>This API can be used to manually generate 11994 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11995 * {@link #getDrawingCache()}.</p> 11996 * 11997 * @param enabled true to enable the drawing cache, false otherwise 11998 * 11999 * @see #isDrawingCacheEnabled() 12000 * @see #getDrawingCache() 12001 * @see #buildDrawingCache() 12002 * @see #setLayerType(int, android.graphics.Paint) 12003 */ 12004 public void setDrawingCacheEnabled(boolean enabled) { 12005 mCachingFailed = false; 12006 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12007 } 12008 12009 /** 12010 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12011 * 12012 * @return true if the drawing cache is enabled 12013 * 12014 * @see #setDrawingCacheEnabled(boolean) 12015 * @see #getDrawingCache() 12016 */ 12017 @ViewDebug.ExportedProperty(category = "drawing") 12018 public boolean isDrawingCacheEnabled() { 12019 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12020 } 12021 12022 /** 12023 * Debugging utility which recursively outputs the dirty state of a view and its 12024 * descendants. 12025 * 12026 * @hide 12027 */ 12028 @SuppressWarnings({"UnusedDeclaration"}) 12029 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12030 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12031 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12032 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12033 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12034 if (clear) { 12035 mPrivateFlags &= clearMask; 12036 } 12037 if (this instanceof ViewGroup) { 12038 ViewGroup parent = (ViewGroup) this; 12039 final int count = parent.getChildCount(); 12040 for (int i = 0; i < count; i++) { 12041 final View child = parent.getChildAt(i); 12042 child.outputDirtyFlags(indent + " ", clear, clearMask); 12043 } 12044 } 12045 } 12046 12047 /** 12048 * This method is used by ViewGroup to cause its children to restore or recreate their 12049 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12050 * to recreate its own display list, which would happen if it went through the normal 12051 * draw/dispatchDraw mechanisms. 12052 * 12053 * @hide 12054 */ 12055 protected void dispatchGetDisplayList() {} 12056 12057 /** 12058 * A view that is not attached or hardware accelerated cannot create a display list. 12059 * This method checks these conditions and returns the appropriate result. 12060 * 12061 * @return true if view has the ability to create a display list, false otherwise. 12062 * 12063 * @hide 12064 */ 12065 public boolean canHaveDisplayList() { 12066 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12067 } 12068 12069 /** 12070 * @return The HardwareRenderer associated with that view or null if hardware rendering 12071 * is not supported or this this has not been attached to a window. 12072 * 12073 * @hide 12074 */ 12075 public HardwareRenderer getHardwareRenderer() { 12076 if (mAttachInfo != null) { 12077 return mAttachInfo.mHardwareRenderer; 12078 } 12079 return null; 12080 } 12081 12082 /** 12083 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12084 * Otherwise, the same display list will be returned (after having been rendered into 12085 * along the way, depending on the invalidation state of the view). 12086 * 12087 * @param displayList The previous version of this displayList, could be null. 12088 * @param isLayer Whether the requester of the display list is a layer. If so, 12089 * the view will avoid creating a layer inside the resulting display list. 12090 * @return A new or reused DisplayList object. 12091 */ 12092 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12093 if (!canHaveDisplayList()) { 12094 return null; 12095 } 12096 12097 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12098 displayList == null || !displayList.isValid() || 12099 (!isLayer && mRecreateDisplayList))) { 12100 // Don't need to recreate the display list, just need to tell our 12101 // children to restore/recreate theirs 12102 if (displayList != null && displayList.isValid() && 12103 !isLayer && !mRecreateDisplayList) { 12104 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12105 mPrivateFlags &= ~DIRTY_MASK; 12106 dispatchGetDisplayList(); 12107 12108 return displayList; 12109 } 12110 12111 if (!isLayer) { 12112 // If we got here, we're recreating it. Mark it as such to ensure that 12113 // we copy in child display lists into ours in drawChild() 12114 mRecreateDisplayList = true; 12115 } 12116 if (displayList == null) { 12117 final String name = getClass().getSimpleName(); 12118 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12119 // If we're creating a new display list, make sure our parent gets invalidated 12120 // since they will need to recreate their display list to account for this 12121 // new child display list. 12122 invalidateParentCaches(); 12123 } 12124 12125 boolean caching = false; 12126 final HardwareCanvas canvas = displayList.start(); 12127 int width = mRight - mLeft; 12128 int height = mBottom - mTop; 12129 12130 try { 12131 canvas.setViewport(width, height); 12132 // The dirty rect should always be null for a display list 12133 canvas.onPreDraw(null); 12134 int layerType = ( 12135 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12136 getLayerType() : LAYER_TYPE_NONE; 12137 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12138 if (layerType == LAYER_TYPE_HARDWARE) { 12139 final HardwareLayer layer = getHardwareLayer(); 12140 if (layer != null && layer.isValid()) { 12141 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12142 } else { 12143 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12144 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12145 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12146 } 12147 caching = true; 12148 } else { 12149 buildDrawingCache(true); 12150 Bitmap cache = getDrawingCache(true); 12151 if (cache != null) { 12152 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12153 caching = true; 12154 } 12155 } 12156 } else { 12157 12158 computeScroll(); 12159 12160 canvas.translate(-mScrollX, -mScrollY); 12161 if (!isLayer) { 12162 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12163 mPrivateFlags &= ~DIRTY_MASK; 12164 } 12165 12166 // Fast path for layouts with no backgrounds 12167 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12168 dispatchDraw(canvas); 12169 } else { 12170 draw(canvas); 12171 } 12172 } 12173 } finally { 12174 canvas.onPostDraw(); 12175 12176 displayList.end(); 12177 displayList.setCaching(caching); 12178 if (isLayer) { 12179 displayList.setLeftTopRightBottom(0, 0, width, height); 12180 } else { 12181 setDisplayListProperties(displayList); 12182 } 12183 } 12184 } else if (!isLayer) { 12185 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12186 mPrivateFlags &= ~DIRTY_MASK; 12187 } 12188 12189 return displayList; 12190 } 12191 12192 /** 12193 * Get the DisplayList for the HardwareLayer 12194 * 12195 * @param layer The HardwareLayer whose DisplayList we want 12196 * @return A DisplayList fopr the specified HardwareLayer 12197 */ 12198 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12199 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12200 layer.setDisplayList(displayList); 12201 return displayList; 12202 } 12203 12204 12205 /** 12206 * <p>Returns a display list that can be used to draw this view again 12207 * without executing its draw method.</p> 12208 * 12209 * @return A DisplayList ready to replay, or null if caching is not enabled. 12210 * 12211 * @hide 12212 */ 12213 public DisplayList getDisplayList() { 12214 mDisplayList = getDisplayList(mDisplayList, false); 12215 return mDisplayList; 12216 } 12217 12218 /** 12219 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12220 * 12221 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12222 * 12223 * @see #getDrawingCache(boolean) 12224 */ 12225 public Bitmap getDrawingCache() { 12226 return getDrawingCache(false); 12227 } 12228 12229 /** 12230 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12231 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12232 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12233 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12234 * request the drawing cache by calling this method and draw it on screen if the 12235 * returned bitmap is not null.</p> 12236 * 12237 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12238 * this method will create a bitmap of the same size as this view. Because this bitmap 12239 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12240 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12241 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12242 * size than the view. This implies that your application must be able to handle this 12243 * size.</p> 12244 * 12245 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12246 * the current density of the screen when the application is in compatibility 12247 * mode. 12248 * 12249 * @return A bitmap representing this view or null if cache is disabled. 12250 * 12251 * @see #setDrawingCacheEnabled(boolean) 12252 * @see #isDrawingCacheEnabled() 12253 * @see #buildDrawingCache(boolean) 12254 * @see #destroyDrawingCache() 12255 */ 12256 public Bitmap getDrawingCache(boolean autoScale) { 12257 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12258 return null; 12259 } 12260 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12261 buildDrawingCache(autoScale); 12262 } 12263 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12264 } 12265 12266 /** 12267 * <p>Frees the resources used by the drawing cache. If you call 12268 * {@link #buildDrawingCache()} manually without calling 12269 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12270 * should cleanup the cache with this method afterwards.</p> 12271 * 12272 * @see #setDrawingCacheEnabled(boolean) 12273 * @see #buildDrawingCache() 12274 * @see #getDrawingCache() 12275 */ 12276 public void destroyDrawingCache() { 12277 if (mDrawingCache != null) { 12278 mDrawingCache.recycle(); 12279 mDrawingCache = null; 12280 } 12281 if (mUnscaledDrawingCache != null) { 12282 mUnscaledDrawingCache.recycle(); 12283 mUnscaledDrawingCache = null; 12284 } 12285 } 12286 12287 /** 12288 * Setting a solid background color for the drawing cache's bitmaps will improve 12289 * performance and memory usage. Note, though that this should only be used if this 12290 * view will always be drawn on top of a solid color. 12291 * 12292 * @param color The background color to use for the drawing cache's bitmap 12293 * 12294 * @see #setDrawingCacheEnabled(boolean) 12295 * @see #buildDrawingCache() 12296 * @see #getDrawingCache() 12297 */ 12298 public void setDrawingCacheBackgroundColor(int color) { 12299 if (color != mDrawingCacheBackgroundColor) { 12300 mDrawingCacheBackgroundColor = color; 12301 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12302 } 12303 } 12304 12305 /** 12306 * @see #setDrawingCacheBackgroundColor(int) 12307 * 12308 * @return The background color to used for the drawing cache's bitmap 12309 */ 12310 public int getDrawingCacheBackgroundColor() { 12311 return mDrawingCacheBackgroundColor; 12312 } 12313 12314 /** 12315 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12316 * 12317 * @see #buildDrawingCache(boolean) 12318 */ 12319 public void buildDrawingCache() { 12320 buildDrawingCache(false); 12321 } 12322 12323 /** 12324 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12325 * 12326 * <p>If you call {@link #buildDrawingCache()} manually without calling 12327 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12328 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12329 * 12330 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12331 * this method will create a bitmap of the same size as this view. Because this bitmap 12332 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12333 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12334 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12335 * size than the view. This implies that your application must be able to handle this 12336 * size.</p> 12337 * 12338 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12339 * you do not need the drawing cache bitmap, calling this method will increase memory 12340 * usage and cause the view to be rendered in software once, thus negatively impacting 12341 * performance.</p> 12342 * 12343 * @see #getDrawingCache() 12344 * @see #destroyDrawingCache() 12345 */ 12346 public void buildDrawingCache(boolean autoScale) { 12347 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12348 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12349 mCachingFailed = false; 12350 12351 if (ViewDebug.TRACE_HIERARCHY) { 12352 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12353 } 12354 12355 int width = mRight - mLeft; 12356 int height = mBottom - mTop; 12357 12358 final AttachInfo attachInfo = mAttachInfo; 12359 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12360 12361 if (autoScale && scalingRequired) { 12362 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12363 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12364 } 12365 12366 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12367 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12368 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12369 12370 if (width <= 0 || height <= 0 || 12371 // Projected bitmap size in bytes 12372 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12373 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12374 destroyDrawingCache(); 12375 mCachingFailed = true; 12376 return; 12377 } 12378 12379 boolean clear = true; 12380 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12381 12382 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12383 Bitmap.Config quality; 12384 if (!opaque) { 12385 // Never pick ARGB_4444 because it looks awful 12386 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12387 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12388 case DRAWING_CACHE_QUALITY_AUTO: 12389 quality = Bitmap.Config.ARGB_8888; 12390 break; 12391 case DRAWING_CACHE_QUALITY_LOW: 12392 quality = Bitmap.Config.ARGB_8888; 12393 break; 12394 case DRAWING_CACHE_QUALITY_HIGH: 12395 quality = Bitmap.Config.ARGB_8888; 12396 break; 12397 default: 12398 quality = Bitmap.Config.ARGB_8888; 12399 break; 12400 } 12401 } else { 12402 // Optimization for translucent windows 12403 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12404 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12405 } 12406 12407 // Try to cleanup memory 12408 if (bitmap != null) bitmap.recycle(); 12409 12410 try { 12411 bitmap = Bitmap.createBitmap(width, height, quality); 12412 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12413 if (autoScale) { 12414 mDrawingCache = bitmap; 12415 } else { 12416 mUnscaledDrawingCache = bitmap; 12417 } 12418 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12419 } catch (OutOfMemoryError e) { 12420 // If there is not enough memory to create the bitmap cache, just 12421 // ignore the issue as bitmap caches are not required to draw the 12422 // view hierarchy 12423 if (autoScale) { 12424 mDrawingCache = null; 12425 } else { 12426 mUnscaledDrawingCache = null; 12427 } 12428 mCachingFailed = true; 12429 return; 12430 } 12431 12432 clear = drawingCacheBackgroundColor != 0; 12433 } 12434 12435 Canvas canvas; 12436 if (attachInfo != null) { 12437 canvas = attachInfo.mCanvas; 12438 if (canvas == null) { 12439 canvas = new Canvas(); 12440 } 12441 canvas.setBitmap(bitmap); 12442 // Temporarily clobber the cached Canvas in case one of our children 12443 // is also using a drawing cache. Without this, the children would 12444 // steal the canvas by attaching their own bitmap to it and bad, bad 12445 // thing would happen (invisible views, corrupted drawings, etc.) 12446 attachInfo.mCanvas = null; 12447 } else { 12448 // This case should hopefully never or seldom happen 12449 canvas = new Canvas(bitmap); 12450 } 12451 12452 if (clear) { 12453 bitmap.eraseColor(drawingCacheBackgroundColor); 12454 } 12455 12456 computeScroll(); 12457 final int restoreCount = canvas.save(); 12458 12459 if (autoScale && scalingRequired) { 12460 final float scale = attachInfo.mApplicationScale; 12461 canvas.scale(scale, scale); 12462 } 12463 12464 canvas.translate(-mScrollX, -mScrollY); 12465 12466 mPrivateFlags |= DRAWN; 12467 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12468 mLayerType != LAYER_TYPE_NONE) { 12469 mPrivateFlags |= DRAWING_CACHE_VALID; 12470 } 12471 12472 // Fast path for layouts with no backgrounds 12473 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12474 if (ViewDebug.TRACE_HIERARCHY) { 12475 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12476 } 12477 mPrivateFlags &= ~DIRTY_MASK; 12478 dispatchDraw(canvas); 12479 } else { 12480 draw(canvas); 12481 } 12482 12483 canvas.restoreToCount(restoreCount); 12484 canvas.setBitmap(null); 12485 12486 if (attachInfo != null) { 12487 // Restore the cached Canvas for our siblings 12488 attachInfo.mCanvas = canvas; 12489 } 12490 } 12491 } 12492 12493 /** 12494 * Create a snapshot of the view into a bitmap. We should probably make 12495 * some form of this public, but should think about the API. 12496 */ 12497 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12498 int width = mRight - mLeft; 12499 int height = mBottom - mTop; 12500 12501 final AttachInfo attachInfo = mAttachInfo; 12502 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12503 width = (int) ((width * scale) + 0.5f); 12504 height = (int) ((height * scale) + 0.5f); 12505 12506 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12507 if (bitmap == null) { 12508 throw new OutOfMemoryError(); 12509 } 12510 12511 Resources resources = getResources(); 12512 if (resources != null) { 12513 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12514 } 12515 12516 Canvas canvas; 12517 if (attachInfo != null) { 12518 canvas = attachInfo.mCanvas; 12519 if (canvas == null) { 12520 canvas = new Canvas(); 12521 } 12522 canvas.setBitmap(bitmap); 12523 // Temporarily clobber the cached Canvas in case one of our children 12524 // is also using a drawing cache. Without this, the children would 12525 // steal the canvas by attaching their own bitmap to it and bad, bad 12526 // things would happen (invisible views, corrupted drawings, etc.) 12527 attachInfo.mCanvas = null; 12528 } else { 12529 // This case should hopefully never or seldom happen 12530 canvas = new Canvas(bitmap); 12531 } 12532 12533 if ((backgroundColor & 0xff000000) != 0) { 12534 bitmap.eraseColor(backgroundColor); 12535 } 12536 12537 computeScroll(); 12538 final int restoreCount = canvas.save(); 12539 canvas.scale(scale, scale); 12540 canvas.translate(-mScrollX, -mScrollY); 12541 12542 // Temporarily remove the dirty mask 12543 int flags = mPrivateFlags; 12544 mPrivateFlags &= ~DIRTY_MASK; 12545 12546 // Fast path for layouts with no backgrounds 12547 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12548 dispatchDraw(canvas); 12549 } else { 12550 draw(canvas); 12551 } 12552 12553 mPrivateFlags = flags; 12554 12555 canvas.restoreToCount(restoreCount); 12556 canvas.setBitmap(null); 12557 12558 if (attachInfo != null) { 12559 // Restore the cached Canvas for our siblings 12560 attachInfo.mCanvas = canvas; 12561 } 12562 12563 return bitmap; 12564 } 12565 12566 /** 12567 * Indicates whether this View is currently in edit mode. A View is usually 12568 * in edit mode when displayed within a developer tool. For instance, if 12569 * this View is being drawn by a visual user interface builder, this method 12570 * should return true. 12571 * 12572 * Subclasses should check the return value of this method to provide 12573 * different behaviors if their normal behavior might interfere with the 12574 * host environment. For instance: the class spawns a thread in its 12575 * constructor, the drawing code relies on device-specific features, etc. 12576 * 12577 * This method is usually checked in the drawing code of custom widgets. 12578 * 12579 * @return True if this View is in edit mode, false otherwise. 12580 */ 12581 public boolean isInEditMode() { 12582 return false; 12583 } 12584 12585 /** 12586 * If the View draws content inside its padding and enables fading edges, 12587 * it needs to support padding offsets. Padding offsets are added to the 12588 * fading edges to extend the length of the fade so that it covers pixels 12589 * drawn inside the padding. 12590 * 12591 * Subclasses of this class should override this method if they need 12592 * to draw content inside the padding. 12593 * 12594 * @return True if padding offset must be applied, false otherwise. 12595 * 12596 * @see #getLeftPaddingOffset() 12597 * @see #getRightPaddingOffset() 12598 * @see #getTopPaddingOffset() 12599 * @see #getBottomPaddingOffset() 12600 * 12601 * @since CURRENT 12602 */ 12603 protected boolean isPaddingOffsetRequired() { 12604 return false; 12605 } 12606 12607 /** 12608 * Amount by which to extend the left fading region. Called only when 12609 * {@link #isPaddingOffsetRequired()} returns true. 12610 * 12611 * @return The left padding offset in pixels. 12612 * 12613 * @see #isPaddingOffsetRequired() 12614 * 12615 * @since CURRENT 12616 */ 12617 protected int getLeftPaddingOffset() { 12618 return 0; 12619 } 12620 12621 /** 12622 * Amount by which to extend the right fading region. Called only when 12623 * {@link #isPaddingOffsetRequired()} returns true. 12624 * 12625 * @return The right padding offset in pixels. 12626 * 12627 * @see #isPaddingOffsetRequired() 12628 * 12629 * @since CURRENT 12630 */ 12631 protected int getRightPaddingOffset() { 12632 return 0; 12633 } 12634 12635 /** 12636 * Amount by which to extend the top fading region. Called only when 12637 * {@link #isPaddingOffsetRequired()} returns true. 12638 * 12639 * @return The top padding offset in pixels. 12640 * 12641 * @see #isPaddingOffsetRequired() 12642 * 12643 * @since CURRENT 12644 */ 12645 protected int getTopPaddingOffset() { 12646 return 0; 12647 } 12648 12649 /** 12650 * Amount by which to extend the bottom fading region. Called only when 12651 * {@link #isPaddingOffsetRequired()} returns true. 12652 * 12653 * @return The bottom padding offset in pixels. 12654 * 12655 * @see #isPaddingOffsetRequired() 12656 * 12657 * @since CURRENT 12658 */ 12659 protected int getBottomPaddingOffset() { 12660 return 0; 12661 } 12662 12663 /** 12664 * @hide 12665 * @param offsetRequired 12666 */ 12667 protected int getFadeTop(boolean offsetRequired) { 12668 int top = mPaddingTop; 12669 if (offsetRequired) top += getTopPaddingOffset(); 12670 return top; 12671 } 12672 12673 /** 12674 * @hide 12675 * @param offsetRequired 12676 */ 12677 protected int getFadeHeight(boolean offsetRequired) { 12678 int padding = mPaddingTop; 12679 if (offsetRequired) padding += getTopPaddingOffset(); 12680 return mBottom - mTop - mPaddingBottom - padding; 12681 } 12682 12683 /** 12684 * <p>Indicates whether this view is attached to a hardware accelerated 12685 * window or not.</p> 12686 * 12687 * <p>Even if this method returns true, it does not mean that every call 12688 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12689 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12690 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12691 * window is hardware accelerated, 12692 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12693 * return false, and this method will return true.</p> 12694 * 12695 * @return True if the view is attached to a window and the window is 12696 * hardware accelerated; false in any other case. 12697 */ 12698 public boolean isHardwareAccelerated() { 12699 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12700 } 12701 12702 /** 12703 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12704 * case of an active Animation being run on the view. 12705 */ 12706 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12707 Animation a, boolean scalingRequired) { 12708 Transformation invalidationTransform; 12709 final int flags = parent.mGroupFlags; 12710 final boolean initialized = a.isInitialized(); 12711 if (!initialized) { 12712 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12713 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12714 onAnimationStart(); 12715 } 12716 12717 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12718 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12719 if (parent.mInvalidationTransformation == null) { 12720 parent.mInvalidationTransformation = new Transformation(); 12721 } 12722 invalidationTransform = parent.mInvalidationTransformation; 12723 a.getTransformation(drawingTime, invalidationTransform, 1f); 12724 } else { 12725 invalidationTransform = parent.mChildTransformation; 12726 } 12727 if (more) { 12728 if (!a.willChangeBounds()) { 12729 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12730 parent.FLAG_OPTIMIZE_INVALIDATE) { 12731 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12732 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12733 // The child need to draw an animation, potentially offscreen, so 12734 // make sure we do not cancel invalidate requests 12735 parent.mPrivateFlags |= DRAW_ANIMATION; 12736 parent.invalidate(mLeft, mTop, mRight, mBottom); 12737 } 12738 } else { 12739 if (parent.mInvalidateRegion == null) { 12740 parent.mInvalidateRegion = new RectF(); 12741 } 12742 final RectF region = parent.mInvalidateRegion; 12743 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12744 invalidationTransform); 12745 12746 // The child need to draw an animation, potentially offscreen, so 12747 // make sure we do not cancel invalidate requests 12748 parent.mPrivateFlags |= DRAW_ANIMATION; 12749 12750 final int left = mLeft + (int) region.left; 12751 final int top = mTop + (int) region.top; 12752 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12753 top + (int) (region.height() + .5f)); 12754 } 12755 } 12756 return more; 12757 } 12758 12759 /** 12760 * This method is called by getDisplayList() when a display list is created or re-rendered. 12761 * It sets or resets the current value of all properties on that display list (resetting is 12762 * necessary when a display list is being re-created, because we need to make sure that 12763 * previously-set transform values 12764 */ 12765 void setDisplayListProperties(DisplayList displayList) { 12766 if (displayList != null) { 12767 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12768 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12769 if (mParent instanceof ViewGroup) { 12770 displayList.setClipChildren( 12771 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12772 } 12773 float alpha = 1; 12774 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12775 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12776 ViewGroup parentVG = (ViewGroup) mParent; 12777 final boolean hasTransform = 12778 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12779 if (hasTransform) { 12780 Transformation transform = parentVG.mChildTransformation; 12781 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12782 if (transformType != Transformation.TYPE_IDENTITY) { 12783 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12784 alpha = transform.getAlpha(); 12785 } 12786 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12787 displayList.setStaticMatrix(transform.getMatrix()); 12788 } 12789 } 12790 } 12791 } 12792 if (mTransformationInfo != null) { 12793 alpha *= mTransformationInfo.mAlpha; 12794 if (alpha < 1) { 12795 final int multipliedAlpha = (int) (255 * alpha); 12796 if (onSetAlpha(multipliedAlpha)) { 12797 alpha = 1; 12798 } 12799 } 12800 displayList.setTransformationInfo(alpha, 12801 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12802 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12803 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12804 mTransformationInfo.mScaleY); 12805 if (mTransformationInfo.mCamera == null) { 12806 mTransformationInfo.mCamera = new Camera(); 12807 mTransformationInfo.matrix3D = new Matrix(); 12808 } 12809 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12810 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12811 displayList.setPivotX(getPivotX()); 12812 displayList.setPivotY(getPivotY()); 12813 } 12814 } else if (alpha < 1) { 12815 displayList.setAlpha(alpha); 12816 } 12817 } 12818 } 12819 12820 /** 12821 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12822 * This draw() method is an implementation detail and is not intended to be overridden or 12823 * to be called from anywhere else other than ViewGroup.drawChild(). 12824 */ 12825 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12826 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12827 boolean more = false; 12828 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12829 final int flags = parent.mGroupFlags; 12830 12831 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12832 parent.mChildTransformation.clear(); 12833 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12834 } 12835 12836 Transformation transformToApply = null; 12837 boolean concatMatrix = false; 12838 12839 boolean scalingRequired = false; 12840 boolean caching; 12841 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12842 12843 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12844 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12845 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12846 caching = true; 12847 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12848 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12849 } else { 12850 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12851 } 12852 12853 final Animation a = getAnimation(); 12854 if (a != null) { 12855 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12856 concatMatrix = a.willChangeTransformationMatrix(); 12857 if (concatMatrix) { 12858 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12859 } 12860 transformToApply = parent.mChildTransformation; 12861 } else { 12862 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12863 mDisplayList != null) { 12864 // No longer animating: clear out old animation matrix 12865 mDisplayList.setAnimationMatrix(null); 12866 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12867 } 12868 if (!useDisplayListProperties && 12869 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12870 final boolean hasTransform = 12871 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12872 if (hasTransform) { 12873 final int transformType = parent.mChildTransformation.getTransformationType(); 12874 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12875 parent.mChildTransformation : null; 12876 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12877 } 12878 } 12879 } 12880 12881 concatMatrix |= !childHasIdentityMatrix; 12882 12883 // Sets the flag as early as possible to allow draw() implementations 12884 // to call invalidate() successfully when doing animations 12885 mPrivateFlags |= DRAWN; 12886 12887 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12888 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12889 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12890 return more; 12891 } 12892 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12893 12894 if (hardwareAccelerated) { 12895 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12896 // retain the flag's value temporarily in the mRecreateDisplayList flag 12897 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12898 mPrivateFlags &= ~INVALIDATED; 12899 } 12900 12901 computeScroll(); 12902 12903 final int sx = mScrollX; 12904 final int sy = mScrollY; 12905 12906 DisplayList displayList = null; 12907 Bitmap cache = null; 12908 boolean hasDisplayList = false; 12909 if (caching) { 12910 if (!hardwareAccelerated) { 12911 if (layerType != LAYER_TYPE_NONE) { 12912 layerType = LAYER_TYPE_SOFTWARE; 12913 buildDrawingCache(true); 12914 } 12915 cache = getDrawingCache(true); 12916 } else { 12917 switch (layerType) { 12918 case LAYER_TYPE_SOFTWARE: 12919 if (useDisplayListProperties) { 12920 hasDisplayList = canHaveDisplayList(); 12921 } else { 12922 buildDrawingCache(true); 12923 cache = getDrawingCache(true); 12924 } 12925 break; 12926 case LAYER_TYPE_HARDWARE: 12927 if (useDisplayListProperties) { 12928 hasDisplayList = canHaveDisplayList(); 12929 } 12930 break; 12931 case LAYER_TYPE_NONE: 12932 // Delay getting the display list until animation-driven alpha values are 12933 // set up and possibly passed on to the view 12934 hasDisplayList = canHaveDisplayList(); 12935 break; 12936 } 12937 } 12938 } 12939 useDisplayListProperties &= hasDisplayList; 12940 if (useDisplayListProperties) { 12941 displayList = getDisplayList(); 12942 if (!displayList.isValid()) { 12943 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12944 // to getDisplayList(), the display list will be marked invalid and we should not 12945 // try to use it again. 12946 displayList = null; 12947 hasDisplayList = false; 12948 useDisplayListProperties = false; 12949 } 12950 } 12951 12952 final boolean hasNoCache = cache == null || hasDisplayList; 12953 final boolean offsetForScroll = cache == null && !hasDisplayList && 12954 layerType != LAYER_TYPE_HARDWARE; 12955 12956 int restoreTo = -1; 12957 if (!useDisplayListProperties || transformToApply != null) { 12958 restoreTo = canvas.save(); 12959 } 12960 if (offsetForScroll) { 12961 canvas.translate(mLeft - sx, mTop - sy); 12962 } else { 12963 if (!useDisplayListProperties) { 12964 canvas.translate(mLeft, mTop); 12965 } 12966 if (scalingRequired) { 12967 if (useDisplayListProperties) { 12968 // TODO: Might not need this if we put everything inside the DL 12969 restoreTo = canvas.save(); 12970 } 12971 // mAttachInfo cannot be null, otherwise scalingRequired == false 12972 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12973 canvas.scale(scale, scale); 12974 } 12975 } 12976 12977 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12978 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12979 if (transformToApply != null || !childHasIdentityMatrix) { 12980 int transX = 0; 12981 int transY = 0; 12982 12983 if (offsetForScroll) { 12984 transX = -sx; 12985 transY = -sy; 12986 } 12987 12988 if (transformToApply != null) { 12989 if (concatMatrix) { 12990 if (useDisplayListProperties) { 12991 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12992 } else { 12993 // Undo the scroll translation, apply the transformation matrix, 12994 // then redo the scroll translate to get the correct result. 12995 canvas.translate(-transX, -transY); 12996 canvas.concat(transformToApply.getMatrix()); 12997 canvas.translate(transX, transY); 12998 } 12999 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13000 } 13001 13002 float transformAlpha = transformToApply.getAlpha(); 13003 if (transformAlpha < 1) { 13004 alpha *= transformToApply.getAlpha(); 13005 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13006 } 13007 } 13008 13009 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13010 canvas.translate(-transX, -transY); 13011 canvas.concat(getMatrix()); 13012 canvas.translate(transX, transY); 13013 } 13014 } 13015 13016 if (alpha < 1) { 13017 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13018 if (hasNoCache) { 13019 final int multipliedAlpha = (int) (255 * alpha); 13020 if (!onSetAlpha(multipliedAlpha)) { 13021 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13022 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13023 layerType != LAYER_TYPE_NONE) { 13024 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13025 } 13026 if (useDisplayListProperties) { 13027 displayList.setAlpha(alpha * getAlpha()); 13028 } else if (layerType == LAYER_TYPE_NONE) { 13029 final int scrollX = hasDisplayList ? 0 : sx; 13030 final int scrollY = hasDisplayList ? 0 : sy; 13031 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13032 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13033 } 13034 } else { 13035 // Alpha is handled by the child directly, clobber the layer's alpha 13036 mPrivateFlags |= ALPHA_SET; 13037 } 13038 } 13039 } 13040 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13041 onSetAlpha(255); 13042 mPrivateFlags &= ~ALPHA_SET; 13043 } 13044 13045 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13046 !useDisplayListProperties) { 13047 if (offsetForScroll) { 13048 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13049 } else { 13050 if (!scalingRequired || cache == null) { 13051 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13052 } else { 13053 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13054 } 13055 } 13056 } 13057 13058 if (!useDisplayListProperties && hasDisplayList) { 13059 displayList = getDisplayList(); 13060 if (!displayList.isValid()) { 13061 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13062 // to getDisplayList(), the display list will be marked invalid and we should not 13063 // try to use it again. 13064 displayList = null; 13065 hasDisplayList = false; 13066 } 13067 } 13068 13069 if (hasNoCache) { 13070 boolean layerRendered = false; 13071 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13072 final HardwareLayer layer = getHardwareLayer(); 13073 if (layer != null && layer.isValid()) { 13074 mLayerPaint.setAlpha((int) (alpha * 255)); 13075 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13076 layerRendered = true; 13077 } else { 13078 final int scrollX = hasDisplayList ? 0 : sx; 13079 final int scrollY = hasDisplayList ? 0 : sy; 13080 canvas.saveLayer(scrollX, scrollY, 13081 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13082 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13083 } 13084 } 13085 13086 if (!layerRendered) { 13087 if (!hasDisplayList) { 13088 // Fast path for layouts with no backgrounds 13089 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13090 if (ViewDebug.TRACE_HIERARCHY) { 13091 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 13092 } 13093 mPrivateFlags &= ~DIRTY_MASK; 13094 dispatchDraw(canvas); 13095 } else { 13096 draw(canvas); 13097 } 13098 } else { 13099 mPrivateFlags &= ~DIRTY_MASK; 13100 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13101 } 13102 } 13103 } else if (cache != null) { 13104 mPrivateFlags &= ~DIRTY_MASK; 13105 Paint cachePaint; 13106 13107 if (layerType == LAYER_TYPE_NONE) { 13108 cachePaint = parent.mCachePaint; 13109 if (cachePaint == null) { 13110 cachePaint = new Paint(); 13111 cachePaint.setDither(false); 13112 parent.mCachePaint = cachePaint; 13113 } 13114 if (alpha < 1) { 13115 cachePaint.setAlpha((int) (alpha * 255)); 13116 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13117 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13118 cachePaint.setAlpha(255); 13119 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13120 } 13121 } else { 13122 cachePaint = mLayerPaint; 13123 cachePaint.setAlpha((int) (alpha * 255)); 13124 } 13125 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13126 } 13127 13128 if (restoreTo >= 0) { 13129 canvas.restoreToCount(restoreTo); 13130 } 13131 13132 if (a != null && !more) { 13133 if (!hardwareAccelerated && !a.getFillAfter()) { 13134 onSetAlpha(255); 13135 } 13136 parent.finishAnimatingView(this, a); 13137 } 13138 13139 if (more && hardwareAccelerated) { 13140 // invalidation is the trigger to recreate display lists, so if we're using 13141 // display lists to render, force an invalidate to allow the animation to 13142 // continue drawing another frame 13143 parent.invalidate(true); 13144 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13145 // alpha animations should cause the child to recreate its display list 13146 invalidate(true); 13147 } 13148 } 13149 13150 mRecreateDisplayList = false; 13151 13152 return more; 13153 } 13154 13155 /** 13156 * Manually render this view (and all of its children) to the given Canvas. 13157 * The view must have already done a full layout before this function is 13158 * called. When implementing a view, implement 13159 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13160 * If you do need to override this method, call the superclass version. 13161 * 13162 * @param canvas The Canvas to which the View is rendered. 13163 */ 13164 public void draw(Canvas canvas) { 13165 if (ViewDebug.TRACE_HIERARCHY) { 13166 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13167 } 13168 13169 final int privateFlags = mPrivateFlags; 13170 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13171 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13172 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13173 13174 /* 13175 * Draw traversal performs several drawing steps which must be executed 13176 * in the appropriate order: 13177 * 13178 * 1. Draw the background 13179 * 2. If necessary, save the canvas' layers to prepare for fading 13180 * 3. Draw view's content 13181 * 4. Draw children 13182 * 5. If necessary, draw the fading edges and restore layers 13183 * 6. Draw decorations (scrollbars for instance) 13184 */ 13185 13186 // Step 1, draw the background, if needed 13187 int saveCount; 13188 13189 if (!dirtyOpaque) { 13190 final Drawable background = mBackground; 13191 if (background != null) { 13192 final int scrollX = mScrollX; 13193 final int scrollY = mScrollY; 13194 13195 if (mBackgroundSizeChanged) { 13196 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13197 mBackgroundSizeChanged = false; 13198 } 13199 13200 if ((scrollX | scrollY) == 0) { 13201 background.draw(canvas); 13202 } else { 13203 canvas.translate(scrollX, scrollY); 13204 background.draw(canvas); 13205 canvas.translate(-scrollX, -scrollY); 13206 } 13207 } 13208 } 13209 13210 // skip step 2 & 5 if possible (common case) 13211 final int viewFlags = mViewFlags; 13212 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13213 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13214 if (!verticalEdges && !horizontalEdges) { 13215 // Step 3, draw the content 13216 if (!dirtyOpaque) onDraw(canvas); 13217 13218 // Step 4, draw the children 13219 dispatchDraw(canvas); 13220 13221 // Step 6, draw decorations (scrollbars) 13222 onDrawScrollBars(canvas); 13223 13224 // we're done... 13225 return; 13226 } 13227 13228 /* 13229 * Here we do the full fledged routine... 13230 * (this is an uncommon case where speed matters less, 13231 * this is why we repeat some of the tests that have been 13232 * done above) 13233 */ 13234 13235 boolean drawTop = false; 13236 boolean drawBottom = false; 13237 boolean drawLeft = false; 13238 boolean drawRight = false; 13239 13240 float topFadeStrength = 0.0f; 13241 float bottomFadeStrength = 0.0f; 13242 float leftFadeStrength = 0.0f; 13243 float rightFadeStrength = 0.0f; 13244 13245 // Step 2, save the canvas' layers 13246 int paddingLeft = mPaddingLeft; 13247 13248 final boolean offsetRequired = isPaddingOffsetRequired(); 13249 if (offsetRequired) { 13250 paddingLeft += getLeftPaddingOffset(); 13251 } 13252 13253 int left = mScrollX + paddingLeft; 13254 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13255 int top = mScrollY + getFadeTop(offsetRequired); 13256 int bottom = top + getFadeHeight(offsetRequired); 13257 13258 if (offsetRequired) { 13259 right += getRightPaddingOffset(); 13260 bottom += getBottomPaddingOffset(); 13261 } 13262 13263 final ScrollabilityCache scrollabilityCache = mScrollCache; 13264 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13265 int length = (int) fadeHeight; 13266 13267 // clip the fade length if top and bottom fades overlap 13268 // overlapping fades produce odd-looking artifacts 13269 if (verticalEdges && (top + length > bottom - length)) { 13270 length = (bottom - top) / 2; 13271 } 13272 13273 // also clip horizontal fades if necessary 13274 if (horizontalEdges && (left + length > right - length)) { 13275 length = (right - left) / 2; 13276 } 13277 13278 if (verticalEdges) { 13279 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13280 drawTop = topFadeStrength * fadeHeight > 1.0f; 13281 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13282 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13283 } 13284 13285 if (horizontalEdges) { 13286 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13287 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13288 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13289 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13290 } 13291 13292 saveCount = canvas.getSaveCount(); 13293 13294 int solidColor = getSolidColor(); 13295 if (solidColor == 0) { 13296 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13297 13298 if (drawTop) { 13299 canvas.saveLayer(left, top, right, top + length, null, flags); 13300 } 13301 13302 if (drawBottom) { 13303 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13304 } 13305 13306 if (drawLeft) { 13307 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13308 } 13309 13310 if (drawRight) { 13311 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13312 } 13313 } else { 13314 scrollabilityCache.setFadeColor(solidColor); 13315 } 13316 13317 // Step 3, draw the content 13318 if (!dirtyOpaque) onDraw(canvas); 13319 13320 // Step 4, draw the children 13321 dispatchDraw(canvas); 13322 13323 // Step 5, draw the fade effect and restore layers 13324 final Paint p = scrollabilityCache.paint; 13325 final Matrix matrix = scrollabilityCache.matrix; 13326 final Shader fade = scrollabilityCache.shader; 13327 13328 if (drawTop) { 13329 matrix.setScale(1, fadeHeight * topFadeStrength); 13330 matrix.postTranslate(left, top); 13331 fade.setLocalMatrix(matrix); 13332 canvas.drawRect(left, top, right, top + length, p); 13333 } 13334 13335 if (drawBottom) { 13336 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13337 matrix.postRotate(180); 13338 matrix.postTranslate(left, bottom); 13339 fade.setLocalMatrix(matrix); 13340 canvas.drawRect(left, bottom - length, right, bottom, p); 13341 } 13342 13343 if (drawLeft) { 13344 matrix.setScale(1, fadeHeight * leftFadeStrength); 13345 matrix.postRotate(-90); 13346 matrix.postTranslate(left, top); 13347 fade.setLocalMatrix(matrix); 13348 canvas.drawRect(left, top, left + length, bottom, p); 13349 } 13350 13351 if (drawRight) { 13352 matrix.setScale(1, fadeHeight * rightFadeStrength); 13353 matrix.postRotate(90); 13354 matrix.postTranslate(right, top); 13355 fade.setLocalMatrix(matrix); 13356 canvas.drawRect(right - length, top, right, bottom, p); 13357 } 13358 13359 canvas.restoreToCount(saveCount); 13360 13361 // Step 6, draw decorations (scrollbars) 13362 onDrawScrollBars(canvas); 13363 } 13364 13365 /** 13366 * Override this if your view is known to always be drawn on top of a solid color background, 13367 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13368 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13369 * should be set to 0xFF. 13370 * 13371 * @see #setVerticalFadingEdgeEnabled(boolean) 13372 * @see #setHorizontalFadingEdgeEnabled(boolean) 13373 * 13374 * @return The known solid color background for this view, or 0 if the color may vary 13375 */ 13376 @ViewDebug.ExportedProperty(category = "drawing") 13377 public int getSolidColor() { 13378 return 0; 13379 } 13380 13381 /** 13382 * Build a human readable string representation of the specified view flags. 13383 * 13384 * @param flags the view flags to convert to a string 13385 * @return a String representing the supplied flags 13386 */ 13387 private static String printFlags(int flags) { 13388 String output = ""; 13389 int numFlags = 0; 13390 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13391 output += "TAKES_FOCUS"; 13392 numFlags++; 13393 } 13394 13395 switch (flags & VISIBILITY_MASK) { 13396 case INVISIBLE: 13397 if (numFlags > 0) { 13398 output += " "; 13399 } 13400 output += "INVISIBLE"; 13401 // USELESS HERE numFlags++; 13402 break; 13403 case GONE: 13404 if (numFlags > 0) { 13405 output += " "; 13406 } 13407 output += "GONE"; 13408 // USELESS HERE numFlags++; 13409 break; 13410 default: 13411 break; 13412 } 13413 return output; 13414 } 13415 13416 /** 13417 * Build a human readable string representation of the specified private 13418 * view flags. 13419 * 13420 * @param privateFlags the private view flags to convert to a string 13421 * @return a String representing the supplied flags 13422 */ 13423 private static String printPrivateFlags(int privateFlags) { 13424 String output = ""; 13425 int numFlags = 0; 13426 13427 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13428 output += "WANTS_FOCUS"; 13429 numFlags++; 13430 } 13431 13432 if ((privateFlags & FOCUSED) == FOCUSED) { 13433 if (numFlags > 0) { 13434 output += " "; 13435 } 13436 output += "FOCUSED"; 13437 numFlags++; 13438 } 13439 13440 if ((privateFlags & SELECTED) == SELECTED) { 13441 if (numFlags > 0) { 13442 output += " "; 13443 } 13444 output += "SELECTED"; 13445 numFlags++; 13446 } 13447 13448 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13449 if (numFlags > 0) { 13450 output += " "; 13451 } 13452 output += "IS_ROOT_NAMESPACE"; 13453 numFlags++; 13454 } 13455 13456 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13457 if (numFlags > 0) { 13458 output += " "; 13459 } 13460 output += "HAS_BOUNDS"; 13461 numFlags++; 13462 } 13463 13464 if ((privateFlags & DRAWN) == DRAWN) { 13465 if (numFlags > 0) { 13466 output += " "; 13467 } 13468 output += "DRAWN"; 13469 // USELESS HERE numFlags++; 13470 } 13471 return output; 13472 } 13473 13474 /** 13475 * <p>Indicates whether or not this view's layout will be requested during 13476 * the next hierarchy layout pass.</p> 13477 * 13478 * @return true if the layout will be forced during next layout pass 13479 */ 13480 public boolean isLayoutRequested() { 13481 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13482 } 13483 13484 /** 13485 * Assign a size and position to a view and all of its 13486 * descendants 13487 * 13488 * <p>This is the second phase of the layout mechanism. 13489 * (The first is measuring). In this phase, each parent calls 13490 * layout on all of its children to position them. 13491 * This is typically done using the child measurements 13492 * that were stored in the measure pass().</p> 13493 * 13494 * <p>Derived classes should not override this method. 13495 * Derived classes with children should override 13496 * onLayout. In that method, they should 13497 * call layout on each of their children.</p> 13498 * 13499 * @param l Left position, relative to parent 13500 * @param t Top position, relative to parent 13501 * @param r Right position, relative to parent 13502 * @param b Bottom position, relative to parent 13503 */ 13504 @SuppressWarnings({"unchecked"}) 13505 public void layout(int l, int t, int r, int b) { 13506 int oldL = mLeft; 13507 int oldT = mTop; 13508 int oldB = mBottom; 13509 int oldR = mRight; 13510 boolean changed = setFrame(l, t, r, b); 13511 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13512 if (ViewDebug.TRACE_HIERARCHY) { 13513 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13514 } 13515 13516 onLayout(changed, l, t, r, b); 13517 mPrivateFlags &= ~LAYOUT_REQUIRED; 13518 13519 ListenerInfo li = mListenerInfo; 13520 if (li != null && li.mOnLayoutChangeListeners != null) { 13521 ArrayList<OnLayoutChangeListener> listenersCopy = 13522 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13523 int numListeners = listenersCopy.size(); 13524 for (int i = 0; i < numListeners; ++i) { 13525 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13526 } 13527 } 13528 } 13529 mPrivateFlags &= ~FORCE_LAYOUT; 13530 } 13531 13532 /** 13533 * Called from layout when this view should 13534 * assign a size and position to each of its children. 13535 * 13536 * Derived classes with children should override 13537 * this method and call layout on each of 13538 * their children. 13539 * @param changed This is a new size or position for this view 13540 * @param left Left position, relative to parent 13541 * @param top Top position, relative to parent 13542 * @param right Right position, relative to parent 13543 * @param bottom Bottom position, relative to parent 13544 */ 13545 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13546 } 13547 13548 /** 13549 * Assign a size and position to this view. 13550 * 13551 * This is called from layout. 13552 * 13553 * @param left Left position, relative to parent 13554 * @param top Top position, relative to parent 13555 * @param right Right position, relative to parent 13556 * @param bottom Bottom position, relative to parent 13557 * @return true if the new size and position are different than the 13558 * previous ones 13559 * {@hide} 13560 */ 13561 protected boolean setFrame(int left, int top, int right, int bottom) { 13562 boolean changed = false; 13563 13564 if (DBG) { 13565 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13566 + right + "," + bottom + ")"); 13567 } 13568 13569 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13570 changed = true; 13571 13572 // Remember our drawn bit 13573 int drawn = mPrivateFlags & DRAWN; 13574 13575 int oldWidth = mRight - mLeft; 13576 int oldHeight = mBottom - mTop; 13577 int newWidth = right - left; 13578 int newHeight = bottom - top; 13579 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13580 13581 // Invalidate our old position 13582 invalidate(sizeChanged); 13583 13584 mLeft = left; 13585 mTop = top; 13586 mRight = right; 13587 mBottom = bottom; 13588 if (mDisplayList != null) { 13589 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13590 } 13591 13592 mPrivateFlags |= HAS_BOUNDS; 13593 13594 13595 if (sizeChanged) { 13596 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13597 // A change in dimension means an auto-centered pivot point changes, too 13598 if (mTransformationInfo != null) { 13599 mTransformationInfo.mMatrixDirty = true; 13600 } 13601 } 13602 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13603 } 13604 13605 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13606 // If we are visible, force the DRAWN bit to on so that 13607 // this invalidate will go through (at least to our parent). 13608 // This is because someone may have invalidated this view 13609 // before this call to setFrame came in, thereby clearing 13610 // the DRAWN bit. 13611 mPrivateFlags |= DRAWN; 13612 invalidate(sizeChanged); 13613 // parent display list may need to be recreated based on a change in the bounds 13614 // of any child 13615 invalidateParentCaches(); 13616 } 13617 13618 // Reset drawn bit to original value (invalidate turns it off) 13619 mPrivateFlags |= drawn; 13620 13621 mBackgroundSizeChanged = true; 13622 } 13623 return changed; 13624 } 13625 13626 /** 13627 * Finalize inflating a view from XML. This is called as the last phase 13628 * of inflation, after all child views have been added. 13629 * 13630 * <p>Even if the subclass overrides onFinishInflate, they should always be 13631 * sure to call the super method, so that we get called. 13632 */ 13633 protected void onFinishInflate() { 13634 } 13635 13636 /** 13637 * Returns the resources associated with this view. 13638 * 13639 * @return Resources object. 13640 */ 13641 public Resources getResources() { 13642 return mResources; 13643 } 13644 13645 /** 13646 * Invalidates the specified Drawable. 13647 * 13648 * @param drawable the drawable to invalidate 13649 */ 13650 public void invalidateDrawable(Drawable drawable) { 13651 if (verifyDrawable(drawable)) { 13652 final Rect dirty = drawable.getBounds(); 13653 final int scrollX = mScrollX; 13654 final int scrollY = mScrollY; 13655 13656 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13657 dirty.right + scrollX, dirty.bottom + scrollY); 13658 } 13659 } 13660 13661 /** 13662 * Schedules an action on a drawable to occur at a specified time. 13663 * 13664 * @param who the recipient of the action 13665 * @param what the action to run on the drawable 13666 * @param when the time at which the action must occur. Uses the 13667 * {@link SystemClock#uptimeMillis} timebase. 13668 */ 13669 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13670 if (verifyDrawable(who) && what != null) { 13671 final long delay = when - SystemClock.uptimeMillis(); 13672 if (mAttachInfo != null) { 13673 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13674 Choreographer.CALLBACK_ANIMATION, what, who, 13675 Choreographer.subtractFrameDelay(delay)); 13676 } else { 13677 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13678 } 13679 } 13680 } 13681 13682 /** 13683 * Cancels a scheduled action on a drawable. 13684 * 13685 * @param who the recipient of the action 13686 * @param what the action to cancel 13687 */ 13688 public void unscheduleDrawable(Drawable who, Runnable what) { 13689 if (verifyDrawable(who) && what != null) { 13690 if (mAttachInfo != null) { 13691 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13692 Choreographer.CALLBACK_ANIMATION, what, who); 13693 } else { 13694 ViewRootImpl.getRunQueue().removeCallbacks(what); 13695 } 13696 } 13697 } 13698 13699 /** 13700 * Unschedule any events associated with the given Drawable. This can be 13701 * used when selecting a new Drawable into a view, so that the previous 13702 * one is completely unscheduled. 13703 * 13704 * @param who The Drawable to unschedule. 13705 * 13706 * @see #drawableStateChanged 13707 */ 13708 public void unscheduleDrawable(Drawable who) { 13709 if (mAttachInfo != null && who != null) { 13710 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13711 Choreographer.CALLBACK_ANIMATION, null, who); 13712 } 13713 } 13714 13715 /** 13716 * Return the layout direction of a given Drawable. 13717 * 13718 * @param who the Drawable to query 13719 * @hide 13720 */ 13721 public int getResolvedLayoutDirection(Drawable who) { 13722 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13723 } 13724 13725 /** 13726 * If your view subclass is displaying its own Drawable objects, it should 13727 * override this function and return true for any Drawable it is 13728 * displaying. This allows animations for those drawables to be 13729 * scheduled. 13730 * 13731 * <p>Be sure to call through to the super class when overriding this 13732 * function. 13733 * 13734 * @param who The Drawable to verify. Return true if it is one you are 13735 * displaying, else return the result of calling through to the 13736 * super class. 13737 * 13738 * @return boolean If true than the Drawable is being displayed in the 13739 * view; else false and it is not allowed to animate. 13740 * 13741 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13742 * @see #drawableStateChanged() 13743 */ 13744 protected boolean verifyDrawable(Drawable who) { 13745 return who == mBackground; 13746 } 13747 13748 /** 13749 * This function is called whenever the state of the view changes in such 13750 * a way that it impacts the state of drawables being shown. 13751 * 13752 * <p>Be sure to call through to the superclass when overriding this 13753 * function. 13754 * 13755 * @see Drawable#setState(int[]) 13756 */ 13757 protected void drawableStateChanged() { 13758 Drawable d = mBackground; 13759 if (d != null && d.isStateful()) { 13760 d.setState(getDrawableState()); 13761 } 13762 } 13763 13764 /** 13765 * Call this to force a view to update its drawable state. This will cause 13766 * drawableStateChanged to be called on this view. Views that are interested 13767 * in the new state should call getDrawableState. 13768 * 13769 * @see #drawableStateChanged 13770 * @see #getDrawableState 13771 */ 13772 public void refreshDrawableState() { 13773 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13774 drawableStateChanged(); 13775 13776 ViewParent parent = mParent; 13777 if (parent != null) { 13778 parent.childDrawableStateChanged(this); 13779 } 13780 } 13781 13782 /** 13783 * Return an array of resource IDs of the drawable states representing the 13784 * current state of the view. 13785 * 13786 * @return The current drawable state 13787 * 13788 * @see Drawable#setState(int[]) 13789 * @see #drawableStateChanged() 13790 * @see #onCreateDrawableState(int) 13791 */ 13792 public final int[] getDrawableState() { 13793 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13794 return mDrawableState; 13795 } else { 13796 mDrawableState = onCreateDrawableState(0); 13797 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13798 return mDrawableState; 13799 } 13800 } 13801 13802 /** 13803 * Generate the new {@link android.graphics.drawable.Drawable} state for 13804 * this view. This is called by the view 13805 * system when the cached Drawable state is determined to be invalid. To 13806 * retrieve the current state, you should use {@link #getDrawableState}. 13807 * 13808 * @param extraSpace if non-zero, this is the number of extra entries you 13809 * would like in the returned array in which you can place your own 13810 * states. 13811 * 13812 * @return Returns an array holding the current {@link Drawable} state of 13813 * the view. 13814 * 13815 * @see #mergeDrawableStates(int[], int[]) 13816 */ 13817 protected int[] onCreateDrawableState(int extraSpace) { 13818 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13819 mParent instanceof View) { 13820 return ((View) mParent).onCreateDrawableState(extraSpace); 13821 } 13822 13823 int[] drawableState; 13824 13825 int privateFlags = mPrivateFlags; 13826 13827 int viewStateIndex = 0; 13828 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13829 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13830 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13831 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13832 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13833 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13834 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13835 HardwareRenderer.isAvailable()) { 13836 // This is set if HW acceleration is requested, even if the current 13837 // process doesn't allow it. This is just to allow app preview 13838 // windows to better match their app. 13839 viewStateIndex |= VIEW_STATE_ACCELERATED; 13840 } 13841 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13842 13843 final int privateFlags2 = mPrivateFlags2; 13844 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13845 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13846 13847 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13848 13849 //noinspection ConstantIfStatement 13850 if (false) { 13851 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13852 Log.i("View", toString() 13853 + " pressed=" + ((privateFlags & PRESSED) != 0) 13854 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13855 + " fo=" + hasFocus() 13856 + " sl=" + ((privateFlags & SELECTED) != 0) 13857 + " wf=" + hasWindowFocus() 13858 + ": " + Arrays.toString(drawableState)); 13859 } 13860 13861 if (extraSpace == 0) { 13862 return drawableState; 13863 } 13864 13865 final int[] fullState; 13866 if (drawableState != null) { 13867 fullState = new int[drawableState.length + extraSpace]; 13868 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13869 } else { 13870 fullState = new int[extraSpace]; 13871 } 13872 13873 return fullState; 13874 } 13875 13876 /** 13877 * Merge your own state values in <var>additionalState</var> into the base 13878 * state values <var>baseState</var> that were returned by 13879 * {@link #onCreateDrawableState(int)}. 13880 * 13881 * @param baseState The base state values returned by 13882 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13883 * own additional state values. 13884 * 13885 * @param additionalState The additional state values you would like 13886 * added to <var>baseState</var>; this array is not modified. 13887 * 13888 * @return As a convenience, the <var>baseState</var> array you originally 13889 * passed into the function is returned. 13890 * 13891 * @see #onCreateDrawableState(int) 13892 */ 13893 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13894 final int N = baseState.length; 13895 int i = N - 1; 13896 while (i >= 0 && baseState[i] == 0) { 13897 i--; 13898 } 13899 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13900 return baseState; 13901 } 13902 13903 /** 13904 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13905 * on all Drawable objects associated with this view. 13906 */ 13907 public void jumpDrawablesToCurrentState() { 13908 if (mBackground != null) { 13909 mBackground.jumpToCurrentState(); 13910 } 13911 } 13912 13913 /** 13914 * Sets the background color for this view. 13915 * @param color the color of the background 13916 */ 13917 @RemotableViewMethod 13918 public void setBackgroundColor(int color) { 13919 if (mBackground instanceof ColorDrawable) { 13920 ((ColorDrawable) mBackground).setColor(color); 13921 } else { 13922 setBackground(new ColorDrawable(color)); 13923 } 13924 } 13925 13926 /** 13927 * Set the background to a given resource. The resource should refer to 13928 * a Drawable object or 0 to remove the background. 13929 * @param resid The identifier of the resource. 13930 * 13931 * @attr ref android.R.styleable#View_background 13932 */ 13933 @RemotableViewMethod 13934 public void setBackgroundResource(int resid) { 13935 if (resid != 0 && resid == mBackgroundResource) { 13936 return; 13937 } 13938 13939 Drawable d= null; 13940 if (resid != 0) { 13941 d = mResources.getDrawable(resid); 13942 } 13943 setBackground(d); 13944 13945 mBackgroundResource = resid; 13946 } 13947 13948 /** 13949 * Set the background to a given Drawable, or remove the background. If the 13950 * background has padding, this View's padding is set to the background's 13951 * padding. However, when a background is removed, this View's padding isn't 13952 * touched. If setting the padding is desired, please use 13953 * {@link #setPadding(int, int, int, int)}. 13954 * 13955 * @param background The Drawable to use as the background, or null to remove the 13956 * background 13957 */ 13958 public void setBackground(Drawable background) { 13959 //noinspection deprecation 13960 setBackgroundDrawable(background); 13961 } 13962 13963 /** 13964 * @deprecated use {@link #setBackground(Drawable)} instead 13965 */ 13966 @Deprecated 13967 public void setBackgroundDrawable(Drawable background) { 13968 if (background == mBackground) { 13969 return; 13970 } 13971 13972 boolean requestLayout = false; 13973 13974 mBackgroundResource = 0; 13975 13976 /* 13977 * Regardless of whether we're setting a new background or not, we want 13978 * to clear the previous drawable. 13979 */ 13980 if (mBackground != null) { 13981 mBackground.setCallback(null); 13982 unscheduleDrawable(mBackground); 13983 } 13984 13985 if (background != null) { 13986 Rect padding = sThreadLocal.get(); 13987 if (padding == null) { 13988 padding = new Rect(); 13989 sThreadLocal.set(padding); 13990 } 13991 if (background.getPadding(padding)) { 13992 switch (background.getResolvedLayoutDirectionSelf()) { 13993 case LAYOUT_DIRECTION_RTL: 13994 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13995 break; 13996 case LAYOUT_DIRECTION_LTR: 13997 default: 13998 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13999 } 14000 } 14001 14002 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14003 // if it has a different minimum size, we should layout again 14004 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14005 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14006 requestLayout = true; 14007 } 14008 14009 background.setCallback(this); 14010 if (background.isStateful()) { 14011 background.setState(getDrawableState()); 14012 } 14013 background.setVisible(getVisibility() == VISIBLE, false); 14014 mBackground = background; 14015 14016 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14017 mPrivateFlags &= ~SKIP_DRAW; 14018 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14019 requestLayout = true; 14020 } 14021 } else { 14022 /* Remove the background */ 14023 mBackground = null; 14024 14025 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14026 /* 14027 * This view ONLY drew the background before and we're removing 14028 * the background, so now it won't draw anything 14029 * (hence we SKIP_DRAW) 14030 */ 14031 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14032 mPrivateFlags |= SKIP_DRAW; 14033 } 14034 14035 /* 14036 * When the background is set, we try to apply its padding to this 14037 * View. When the background is removed, we don't touch this View's 14038 * padding. This is noted in the Javadocs. Hence, we don't need to 14039 * requestLayout(), the invalidate() below is sufficient. 14040 */ 14041 14042 // The old background's minimum size could have affected this 14043 // View's layout, so let's requestLayout 14044 requestLayout = true; 14045 } 14046 14047 computeOpaqueFlags(); 14048 14049 if (requestLayout) { 14050 requestLayout(); 14051 } 14052 14053 mBackgroundSizeChanged = true; 14054 invalidate(true); 14055 } 14056 14057 /** 14058 * Gets the background drawable 14059 * 14060 * @return The drawable used as the background for this view, if any. 14061 * 14062 * @see #setBackground(Drawable) 14063 * 14064 * @attr ref android.R.styleable#View_background 14065 */ 14066 public Drawable getBackground() { 14067 return mBackground; 14068 } 14069 14070 /** 14071 * Sets the padding. The view may add on the space required to display 14072 * the scrollbars, depending on the style and visibility of the scrollbars. 14073 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14074 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14075 * from the values set in this call. 14076 * 14077 * @attr ref android.R.styleable#View_padding 14078 * @attr ref android.R.styleable#View_paddingBottom 14079 * @attr ref android.R.styleable#View_paddingLeft 14080 * @attr ref android.R.styleable#View_paddingRight 14081 * @attr ref android.R.styleable#View_paddingTop 14082 * @param left the left padding in pixels 14083 * @param top the top padding in pixels 14084 * @param right the right padding in pixels 14085 * @param bottom the bottom padding in pixels 14086 */ 14087 public void setPadding(int left, int top, int right, int bottom) { 14088 mUserPaddingStart = -1; 14089 mUserPaddingEnd = -1; 14090 mUserPaddingRelative = false; 14091 14092 internalSetPadding(left, top, right, bottom); 14093 } 14094 14095 private void internalSetPadding(int left, int top, int right, int bottom) { 14096 mUserPaddingLeft = left; 14097 mUserPaddingRight = right; 14098 mUserPaddingBottom = bottom; 14099 14100 final int viewFlags = mViewFlags; 14101 boolean changed = false; 14102 14103 // Common case is there are no scroll bars. 14104 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14105 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14106 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14107 ? 0 : getVerticalScrollbarWidth(); 14108 switch (mVerticalScrollbarPosition) { 14109 case SCROLLBAR_POSITION_DEFAULT: 14110 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14111 left += offset; 14112 } else { 14113 right += offset; 14114 } 14115 break; 14116 case SCROLLBAR_POSITION_RIGHT: 14117 right += offset; 14118 break; 14119 case SCROLLBAR_POSITION_LEFT: 14120 left += offset; 14121 break; 14122 } 14123 } 14124 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14125 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14126 ? 0 : getHorizontalScrollbarHeight(); 14127 } 14128 } 14129 14130 if (mPaddingLeft != left) { 14131 changed = true; 14132 mPaddingLeft = left; 14133 } 14134 if (mPaddingTop != top) { 14135 changed = true; 14136 mPaddingTop = top; 14137 } 14138 if (mPaddingRight != right) { 14139 changed = true; 14140 mPaddingRight = right; 14141 } 14142 if (mPaddingBottom != bottom) { 14143 changed = true; 14144 mPaddingBottom = bottom; 14145 } 14146 14147 if (changed) { 14148 requestLayout(); 14149 } 14150 } 14151 14152 /** 14153 * Sets the relative padding. The view may add on the space required to display 14154 * the scrollbars, depending on the style and visibility of the scrollbars. 14155 * from the values set in this call. 14156 * 14157 * @param start the start padding in pixels 14158 * @param top the top padding in pixels 14159 * @param end the end padding in pixels 14160 * @param bottom the bottom padding in pixels 14161 * @hide 14162 */ 14163 public void setPaddingRelative(int start, int top, int end, int bottom) { 14164 mUserPaddingStart = start; 14165 mUserPaddingEnd = end; 14166 mUserPaddingRelative = true; 14167 14168 switch(getResolvedLayoutDirection()) { 14169 case LAYOUT_DIRECTION_RTL: 14170 internalSetPadding(end, top, start, bottom); 14171 break; 14172 case LAYOUT_DIRECTION_LTR: 14173 default: 14174 internalSetPadding(start, top, end, bottom); 14175 } 14176 } 14177 14178 /** 14179 * Returns the top padding of this view. 14180 * 14181 * @return the top padding in pixels 14182 */ 14183 public int getPaddingTop() { 14184 return mPaddingTop; 14185 } 14186 14187 /** 14188 * Returns the bottom padding of this view. If there are inset and enabled 14189 * scrollbars, this value may include the space required to display the 14190 * scrollbars as well. 14191 * 14192 * @return the bottom padding in pixels 14193 */ 14194 public int getPaddingBottom() { 14195 return mPaddingBottom; 14196 } 14197 14198 /** 14199 * Returns the left padding of this view. If there are inset and enabled 14200 * scrollbars, this value may include the space required to display the 14201 * scrollbars as well. 14202 * 14203 * @return the left padding in pixels 14204 */ 14205 public int getPaddingLeft() { 14206 return mPaddingLeft; 14207 } 14208 14209 /** 14210 * Returns the start padding of this view depending on its resolved layout direction. 14211 * If there are inset and enabled scrollbars, this value may include the space 14212 * required to display the scrollbars as well. 14213 * 14214 * @return the start padding in pixels 14215 * @hide 14216 */ 14217 public int getPaddingStart() { 14218 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14219 mPaddingRight : mPaddingLeft; 14220 } 14221 14222 /** 14223 * Returns the right padding of this view. If there are inset and enabled 14224 * scrollbars, this value may include the space required to display the 14225 * scrollbars as well. 14226 * 14227 * @return the right padding in pixels 14228 */ 14229 public int getPaddingRight() { 14230 return mPaddingRight; 14231 } 14232 14233 /** 14234 * Returns the end padding of this view depending on its resolved layout direction. 14235 * If there are inset and enabled scrollbars, this value may include the space 14236 * required to display the scrollbars as well. 14237 * 14238 * @return the end padding in pixels 14239 * @hide 14240 */ 14241 public int getPaddingEnd() { 14242 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14243 mPaddingLeft : mPaddingRight; 14244 } 14245 14246 /** 14247 * Return if the padding as been set thru relative values 14248 * {@link #setPaddingRelative(int, int, int, int)} 14249 * 14250 * @return true if the padding is relative or false if it is not. 14251 * @hide 14252 */ 14253 public boolean isPaddingRelative() { 14254 return mUserPaddingRelative; 14255 } 14256 14257 /** 14258 * @hide 14259 */ 14260 public Insets getOpticalInsets() { 14261 if (mLayoutInsets == null) { 14262 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14263 } 14264 return mLayoutInsets; 14265 } 14266 14267 /** 14268 * @hide 14269 */ 14270 public void setLayoutInsets(Insets layoutInsets) { 14271 mLayoutInsets = layoutInsets; 14272 } 14273 14274 /** 14275 * Changes the selection state of this view. A view can be selected or not. 14276 * Note that selection is not the same as focus. Views are typically 14277 * selected in the context of an AdapterView like ListView or GridView; 14278 * the selected view is the view that is highlighted. 14279 * 14280 * @param selected true if the view must be selected, false otherwise 14281 */ 14282 public void setSelected(boolean selected) { 14283 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14284 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14285 if (!selected) resetPressedState(); 14286 invalidate(true); 14287 refreshDrawableState(); 14288 dispatchSetSelected(selected); 14289 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14290 notifyAccessibilityStateChanged(); 14291 } 14292 } 14293 } 14294 14295 /** 14296 * Dispatch setSelected to all of this View's children. 14297 * 14298 * @see #setSelected(boolean) 14299 * 14300 * @param selected The new selected state 14301 */ 14302 protected void dispatchSetSelected(boolean selected) { 14303 } 14304 14305 /** 14306 * Indicates the selection state of this view. 14307 * 14308 * @return true if the view is selected, false otherwise 14309 */ 14310 @ViewDebug.ExportedProperty 14311 public boolean isSelected() { 14312 return (mPrivateFlags & SELECTED) != 0; 14313 } 14314 14315 /** 14316 * Changes the activated state of this view. A view can be activated or not. 14317 * Note that activation is not the same as selection. Selection is 14318 * a transient property, representing the view (hierarchy) the user is 14319 * currently interacting with. Activation is a longer-term state that the 14320 * user can move views in and out of. For example, in a list view with 14321 * single or multiple selection enabled, the views in the current selection 14322 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14323 * here.) The activated state is propagated down to children of the view it 14324 * is set on. 14325 * 14326 * @param activated true if the view must be activated, false otherwise 14327 */ 14328 public void setActivated(boolean activated) { 14329 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14330 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14331 invalidate(true); 14332 refreshDrawableState(); 14333 dispatchSetActivated(activated); 14334 } 14335 } 14336 14337 /** 14338 * Dispatch setActivated to all of this View's children. 14339 * 14340 * @see #setActivated(boolean) 14341 * 14342 * @param activated The new activated state 14343 */ 14344 protected void dispatchSetActivated(boolean activated) { 14345 } 14346 14347 /** 14348 * Indicates the activation state of this view. 14349 * 14350 * @return true if the view is activated, false otherwise 14351 */ 14352 @ViewDebug.ExportedProperty 14353 public boolean isActivated() { 14354 return (mPrivateFlags & ACTIVATED) != 0; 14355 } 14356 14357 /** 14358 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14359 * observer can be used to get notifications when global events, like 14360 * layout, happen. 14361 * 14362 * The returned ViewTreeObserver observer is not guaranteed to remain 14363 * valid for the lifetime of this View. If the caller of this method keeps 14364 * a long-lived reference to ViewTreeObserver, it should always check for 14365 * the return value of {@link ViewTreeObserver#isAlive()}. 14366 * 14367 * @return The ViewTreeObserver for this view's hierarchy. 14368 */ 14369 public ViewTreeObserver getViewTreeObserver() { 14370 if (mAttachInfo != null) { 14371 return mAttachInfo.mTreeObserver; 14372 } 14373 if (mFloatingTreeObserver == null) { 14374 mFloatingTreeObserver = new ViewTreeObserver(); 14375 } 14376 return mFloatingTreeObserver; 14377 } 14378 14379 /** 14380 * <p>Finds the topmost view in the current view hierarchy.</p> 14381 * 14382 * @return the topmost view containing this view 14383 */ 14384 public View getRootView() { 14385 if (mAttachInfo != null) { 14386 final View v = mAttachInfo.mRootView; 14387 if (v != null) { 14388 return v; 14389 } 14390 } 14391 14392 View parent = this; 14393 14394 while (parent.mParent != null && parent.mParent instanceof View) { 14395 parent = (View) parent.mParent; 14396 } 14397 14398 return parent; 14399 } 14400 14401 /** 14402 * <p>Computes the coordinates of this view on the screen. The argument 14403 * must be an array of two integers. After the method returns, the array 14404 * contains the x and y location in that order.</p> 14405 * 14406 * @param location an array of two integers in which to hold the coordinates 14407 */ 14408 public void getLocationOnScreen(int[] location) { 14409 getLocationInWindow(location); 14410 14411 final AttachInfo info = mAttachInfo; 14412 if (info != null) { 14413 location[0] += info.mWindowLeft; 14414 location[1] += info.mWindowTop; 14415 } 14416 } 14417 14418 /** 14419 * <p>Computes the coordinates of this view in its window. The argument 14420 * must be an array of two integers. After the method returns, the array 14421 * contains the x and y location in that order.</p> 14422 * 14423 * @param location an array of two integers in which to hold the coordinates 14424 */ 14425 public void getLocationInWindow(int[] location) { 14426 if (location == null || location.length < 2) { 14427 throw new IllegalArgumentException("location must be an array of two integers"); 14428 } 14429 14430 if (mAttachInfo == null) { 14431 // When the view is not attached to a window, this method does not make sense 14432 location[0] = location[1] = 0; 14433 return; 14434 } 14435 14436 float[] position = mAttachInfo.mTmpTransformLocation; 14437 position[0] = position[1] = 0.0f; 14438 14439 if (!hasIdentityMatrix()) { 14440 getMatrix().mapPoints(position); 14441 } 14442 14443 position[0] += mLeft; 14444 position[1] += mTop; 14445 14446 ViewParent viewParent = mParent; 14447 while (viewParent instanceof View) { 14448 final View view = (View) viewParent; 14449 14450 position[0] -= view.mScrollX; 14451 position[1] -= view.mScrollY; 14452 14453 if (!view.hasIdentityMatrix()) { 14454 view.getMatrix().mapPoints(position); 14455 } 14456 14457 position[0] += view.mLeft; 14458 position[1] += view.mTop; 14459 14460 viewParent = view.mParent; 14461 } 14462 14463 if (viewParent instanceof ViewRootImpl) { 14464 // *cough* 14465 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14466 position[1] -= vr.mCurScrollY; 14467 } 14468 14469 location[0] = (int) (position[0] + 0.5f); 14470 location[1] = (int) (position[1] + 0.5f); 14471 } 14472 14473 /** 14474 * {@hide} 14475 * @param id the id of the view to be found 14476 * @return the view of the specified id, null if cannot be found 14477 */ 14478 protected View findViewTraversal(int id) { 14479 if (id == mID) { 14480 return this; 14481 } 14482 return null; 14483 } 14484 14485 /** 14486 * {@hide} 14487 * @param tag the tag of the view to be found 14488 * @return the view of specified tag, null if cannot be found 14489 */ 14490 protected View findViewWithTagTraversal(Object tag) { 14491 if (tag != null && tag.equals(mTag)) { 14492 return this; 14493 } 14494 return null; 14495 } 14496 14497 /** 14498 * {@hide} 14499 * @param predicate The predicate to evaluate. 14500 * @param childToSkip If not null, ignores this child during the recursive traversal. 14501 * @return The first view that matches the predicate or null. 14502 */ 14503 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14504 if (predicate.apply(this)) { 14505 return this; 14506 } 14507 return null; 14508 } 14509 14510 /** 14511 * Look for a child view with the given id. If this view has the given 14512 * id, return this view. 14513 * 14514 * @param id The id to search for. 14515 * @return The view that has the given id in the hierarchy or null 14516 */ 14517 public final View findViewById(int id) { 14518 if (id < 0) { 14519 return null; 14520 } 14521 return findViewTraversal(id); 14522 } 14523 14524 /** 14525 * Finds a view by its unuque and stable accessibility id. 14526 * 14527 * @param accessibilityId The searched accessibility id. 14528 * @return The found view. 14529 */ 14530 final View findViewByAccessibilityId(int accessibilityId) { 14531 if (accessibilityId < 0) { 14532 return null; 14533 } 14534 return findViewByAccessibilityIdTraversal(accessibilityId); 14535 } 14536 14537 /** 14538 * Performs the traversal to find a view by its unuque and stable accessibility id. 14539 * 14540 * <strong>Note:</strong>This method does not stop at the root namespace 14541 * boundary since the user can touch the screen at an arbitrary location 14542 * potentially crossing the root namespace bounday which will send an 14543 * accessibility event to accessibility services and they should be able 14544 * to obtain the event source. Also accessibility ids are guaranteed to be 14545 * unique in the window. 14546 * 14547 * @param accessibilityId The accessibility id. 14548 * @return The found view. 14549 */ 14550 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14551 if (getAccessibilityViewId() == accessibilityId) { 14552 return this; 14553 } 14554 return null; 14555 } 14556 14557 /** 14558 * Look for a child view with the given tag. If this view has the given 14559 * tag, return this view. 14560 * 14561 * @param tag The tag to search for, using "tag.equals(getTag())". 14562 * @return The View that has the given tag in the hierarchy or null 14563 */ 14564 public final View findViewWithTag(Object tag) { 14565 if (tag == null) { 14566 return null; 14567 } 14568 return findViewWithTagTraversal(tag); 14569 } 14570 14571 /** 14572 * {@hide} 14573 * Look for a child view that matches the specified predicate. 14574 * If this view matches the predicate, return this view. 14575 * 14576 * @param predicate The predicate to evaluate. 14577 * @return The first view that matches the predicate or null. 14578 */ 14579 public final View findViewByPredicate(Predicate<View> predicate) { 14580 return findViewByPredicateTraversal(predicate, null); 14581 } 14582 14583 /** 14584 * {@hide} 14585 * Look for a child view that matches the specified predicate, 14586 * starting with the specified view and its descendents and then 14587 * recusively searching the ancestors and siblings of that view 14588 * until this view is reached. 14589 * 14590 * This method is useful in cases where the predicate does not match 14591 * a single unique view (perhaps multiple views use the same id) 14592 * and we are trying to find the view that is "closest" in scope to the 14593 * starting view. 14594 * 14595 * @param start The view to start from. 14596 * @param predicate The predicate to evaluate. 14597 * @return The first view that matches the predicate or null. 14598 */ 14599 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14600 View childToSkip = null; 14601 for (;;) { 14602 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14603 if (view != null || start == this) { 14604 return view; 14605 } 14606 14607 ViewParent parent = start.getParent(); 14608 if (parent == null || !(parent instanceof View)) { 14609 return null; 14610 } 14611 14612 childToSkip = start; 14613 start = (View) parent; 14614 } 14615 } 14616 14617 /** 14618 * Sets the identifier for this view. The identifier does not have to be 14619 * unique in this view's hierarchy. The identifier should be a positive 14620 * number. 14621 * 14622 * @see #NO_ID 14623 * @see #getId() 14624 * @see #findViewById(int) 14625 * 14626 * @param id a number used to identify the view 14627 * 14628 * @attr ref android.R.styleable#View_id 14629 */ 14630 public void setId(int id) { 14631 mID = id; 14632 } 14633 14634 /** 14635 * {@hide} 14636 * 14637 * @param isRoot true if the view belongs to the root namespace, false 14638 * otherwise 14639 */ 14640 public void setIsRootNamespace(boolean isRoot) { 14641 if (isRoot) { 14642 mPrivateFlags |= IS_ROOT_NAMESPACE; 14643 } else { 14644 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14645 } 14646 } 14647 14648 /** 14649 * {@hide} 14650 * 14651 * @return true if the view belongs to the root namespace, false otherwise 14652 */ 14653 public boolean isRootNamespace() { 14654 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14655 } 14656 14657 /** 14658 * Returns this view's identifier. 14659 * 14660 * @return a positive integer used to identify the view or {@link #NO_ID} 14661 * if the view has no ID 14662 * 14663 * @see #setId(int) 14664 * @see #findViewById(int) 14665 * @attr ref android.R.styleable#View_id 14666 */ 14667 @ViewDebug.CapturedViewProperty 14668 public int getId() { 14669 return mID; 14670 } 14671 14672 /** 14673 * Returns this view's tag. 14674 * 14675 * @return the Object stored in this view as a tag 14676 * 14677 * @see #setTag(Object) 14678 * @see #getTag(int) 14679 */ 14680 @ViewDebug.ExportedProperty 14681 public Object getTag() { 14682 return mTag; 14683 } 14684 14685 /** 14686 * Sets the tag associated with this view. A tag can be used to mark 14687 * a view in its hierarchy and does not have to be unique within the 14688 * hierarchy. Tags can also be used to store data within a view without 14689 * resorting to another data structure. 14690 * 14691 * @param tag an Object to tag the view with 14692 * 14693 * @see #getTag() 14694 * @see #setTag(int, Object) 14695 */ 14696 public void setTag(final Object tag) { 14697 mTag = tag; 14698 } 14699 14700 /** 14701 * Returns the tag associated with this view and the specified key. 14702 * 14703 * @param key The key identifying the tag 14704 * 14705 * @return the Object stored in this view as a tag 14706 * 14707 * @see #setTag(int, Object) 14708 * @see #getTag() 14709 */ 14710 public Object getTag(int key) { 14711 if (mKeyedTags != null) return mKeyedTags.get(key); 14712 return null; 14713 } 14714 14715 /** 14716 * Sets a tag associated with this view and a key. A tag can be used 14717 * to mark a view in its hierarchy and does not have to be unique within 14718 * the hierarchy. Tags can also be used to store data within a view 14719 * without resorting to another data structure. 14720 * 14721 * The specified key should be an id declared in the resources of the 14722 * application to ensure it is unique (see the <a 14723 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14724 * Keys identified as belonging to 14725 * the Android framework or not associated with any package will cause 14726 * an {@link IllegalArgumentException} to be thrown. 14727 * 14728 * @param key The key identifying the tag 14729 * @param tag An Object to tag the view with 14730 * 14731 * @throws IllegalArgumentException If they specified key is not valid 14732 * 14733 * @see #setTag(Object) 14734 * @see #getTag(int) 14735 */ 14736 public void setTag(int key, final Object tag) { 14737 // If the package id is 0x00 or 0x01, it's either an undefined package 14738 // or a framework id 14739 if ((key >>> 24) < 2) { 14740 throw new IllegalArgumentException("The key must be an application-specific " 14741 + "resource id."); 14742 } 14743 14744 setKeyedTag(key, tag); 14745 } 14746 14747 /** 14748 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14749 * framework id. 14750 * 14751 * @hide 14752 */ 14753 public void setTagInternal(int key, Object tag) { 14754 if ((key >>> 24) != 0x1) { 14755 throw new IllegalArgumentException("The key must be a framework-specific " 14756 + "resource id."); 14757 } 14758 14759 setKeyedTag(key, tag); 14760 } 14761 14762 private void setKeyedTag(int key, Object tag) { 14763 if (mKeyedTags == null) { 14764 mKeyedTags = new SparseArray<Object>(); 14765 } 14766 14767 mKeyedTags.put(key, tag); 14768 } 14769 14770 /** 14771 * @param consistency The type of consistency. See ViewDebug for more information. 14772 * 14773 * @hide 14774 */ 14775 protected boolean dispatchConsistencyCheck(int consistency) { 14776 return onConsistencyCheck(consistency); 14777 } 14778 14779 /** 14780 * Method that subclasses should implement to check their consistency. The type of 14781 * consistency check is indicated by the bit field passed as a parameter. 14782 * 14783 * @param consistency The type of consistency. See ViewDebug for more information. 14784 * 14785 * @throws IllegalStateException if the view is in an inconsistent state. 14786 * 14787 * @hide 14788 */ 14789 protected boolean onConsistencyCheck(int consistency) { 14790 boolean result = true; 14791 14792 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14793 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14794 14795 if (checkLayout) { 14796 if (getParent() == null) { 14797 result = false; 14798 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14799 "View " + this + " does not have a parent."); 14800 } 14801 14802 if (mAttachInfo == null) { 14803 result = false; 14804 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14805 "View " + this + " is not attached to a window."); 14806 } 14807 } 14808 14809 if (checkDrawing) { 14810 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14811 // from their draw() method 14812 14813 if ((mPrivateFlags & DRAWN) != DRAWN && 14814 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14815 result = false; 14816 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14817 "View " + this + " was invalidated but its drawing cache is valid."); 14818 } 14819 } 14820 14821 return result; 14822 } 14823 14824 /** 14825 * Prints information about this view in the log output, with the tag 14826 * {@link #VIEW_LOG_TAG}. 14827 * 14828 * @hide 14829 */ 14830 public void debug() { 14831 debug(0); 14832 } 14833 14834 /** 14835 * Prints information about this view in the log output, with the tag 14836 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14837 * indentation defined by the <code>depth</code>. 14838 * 14839 * @param depth the indentation level 14840 * 14841 * @hide 14842 */ 14843 protected void debug(int depth) { 14844 String output = debugIndent(depth - 1); 14845 14846 output += "+ " + this; 14847 int id = getId(); 14848 if (id != -1) { 14849 output += " (id=" + id + ")"; 14850 } 14851 Object tag = getTag(); 14852 if (tag != null) { 14853 output += " (tag=" + tag + ")"; 14854 } 14855 Log.d(VIEW_LOG_TAG, output); 14856 14857 if ((mPrivateFlags & FOCUSED) != 0) { 14858 output = debugIndent(depth) + " FOCUSED"; 14859 Log.d(VIEW_LOG_TAG, output); 14860 } 14861 14862 output = debugIndent(depth); 14863 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14864 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14865 + "} "; 14866 Log.d(VIEW_LOG_TAG, output); 14867 14868 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14869 || mPaddingBottom != 0) { 14870 output = debugIndent(depth); 14871 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14872 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14873 Log.d(VIEW_LOG_TAG, output); 14874 } 14875 14876 output = debugIndent(depth); 14877 output += "mMeasureWidth=" + mMeasuredWidth + 14878 " mMeasureHeight=" + mMeasuredHeight; 14879 Log.d(VIEW_LOG_TAG, output); 14880 14881 output = debugIndent(depth); 14882 if (mLayoutParams == null) { 14883 output += "BAD! no layout params"; 14884 } else { 14885 output = mLayoutParams.debug(output); 14886 } 14887 Log.d(VIEW_LOG_TAG, output); 14888 14889 output = debugIndent(depth); 14890 output += "flags={"; 14891 output += View.printFlags(mViewFlags); 14892 output += "}"; 14893 Log.d(VIEW_LOG_TAG, output); 14894 14895 output = debugIndent(depth); 14896 output += "privateFlags={"; 14897 output += View.printPrivateFlags(mPrivateFlags); 14898 output += "}"; 14899 Log.d(VIEW_LOG_TAG, output); 14900 } 14901 14902 /** 14903 * Creates a string of whitespaces used for indentation. 14904 * 14905 * @param depth the indentation level 14906 * @return a String containing (depth * 2 + 3) * 2 white spaces 14907 * 14908 * @hide 14909 */ 14910 protected static String debugIndent(int depth) { 14911 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14912 for (int i = 0; i < (depth * 2) + 3; i++) { 14913 spaces.append(' ').append(' '); 14914 } 14915 return spaces.toString(); 14916 } 14917 14918 /** 14919 * <p>Return the offset of the widget's text baseline from the widget's top 14920 * boundary. If this widget does not support baseline alignment, this 14921 * method returns -1. </p> 14922 * 14923 * @return the offset of the baseline within the widget's bounds or -1 14924 * if baseline alignment is not supported 14925 */ 14926 @ViewDebug.ExportedProperty(category = "layout") 14927 public int getBaseline() { 14928 return -1; 14929 } 14930 14931 /** 14932 * Call this when something has changed which has invalidated the 14933 * layout of this view. This will schedule a layout pass of the view 14934 * tree. 14935 */ 14936 public void requestLayout() { 14937 if (ViewDebug.TRACE_HIERARCHY) { 14938 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14939 } 14940 14941 mPrivateFlags |= FORCE_LAYOUT; 14942 mPrivateFlags |= INVALIDATED; 14943 14944 if (mLayoutParams != null) { 14945 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14946 } 14947 14948 if (mParent != null && !mParent.isLayoutRequested()) { 14949 mParent.requestLayout(); 14950 } 14951 } 14952 14953 /** 14954 * Forces this view to be laid out during the next layout pass. 14955 * This method does not call requestLayout() or forceLayout() 14956 * on the parent. 14957 */ 14958 public void forceLayout() { 14959 mPrivateFlags |= FORCE_LAYOUT; 14960 mPrivateFlags |= INVALIDATED; 14961 } 14962 14963 /** 14964 * <p> 14965 * This is called to find out how big a view should be. The parent 14966 * supplies constraint information in the width and height parameters. 14967 * </p> 14968 * 14969 * <p> 14970 * The actual measurement work of a view is performed in 14971 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14972 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14973 * </p> 14974 * 14975 * 14976 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14977 * parent 14978 * @param heightMeasureSpec Vertical space requirements as imposed by the 14979 * parent 14980 * 14981 * @see #onMeasure(int, int) 14982 */ 14983 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14984 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14985 widthMeasureSpec != mOldWidthMeasureSpec || 14986 heightMeasureSpec != mOldHeightMeasureSpec) { 14987 14988 // first clears the measured dimension flag 14989 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14990 14991 if (ViewDebug.TRACE_HIERARCHY) { 14992 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14993 } 14994 14995 // measure ourselves, this should set the measured dimension flag back 14996 onMeasure(widthMeasureSpec, heightMeasureSpec); 14997 14998 // flag not set, setMeasuredDimension() was not invoked, we raise 14999 // an exception to warn the developer 15000 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 15001 throw new IllegalStateException("onMeasure() did not set the" 15002 + " measured dimension by calling" 15003 + " setMeasuredDimension()"); 15004 } 15005 15006 mPrivateFlags |= LAYOUT_REQUIRED; 15007 } 15008 15009 mOldWidthMeasureSpec = widthMeasureSpec; 15010 mOldHeightMeasureSpec = heightMeasureSpec; 15011 } 15012 15013 /** 15014 * <p> 15015 * Measure the view and its content to determine the measured width and the 15016 * measured height. This method is invoked by {@link #measure(int, int)} and 15017 * should be overriden by subclasses to provide accurate and efficient 15018 * measurement of their contents. 15019 * </p> 15020 * 15021 * <p> 15022 * <strong>CONTRACT:</strong> When overriding this method, you 15023 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15024 * measured width and height of this view. Failure to do so will trigger an 15025 * <code>IllegalStateException</code>, thrown by 15026 * {@link #measure(int, int)}. Calling the superclass' 15027 * {@link #onMeasure(int, int)} is a valid use. 15028 * </p> 15029 * 15030 * <p> 15031 * The base class implementation of measure defaults to the background size, 15032 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15033 * override {@link #onMeasure(int, int)} to provide better measurements of 15034 * their content. 15035 * </p> 15036 * 15037 * <p> 15038 * If this method is overridden, it is the subclass's responsibility to make 15039 * sure the measured height and width are at least the view's minimum height 15040 * and width ({@link #getSuggestedMinimumHeight()} and 15041 * {@link #getSuggestedMinimumWidth()}). 15042 * </p> 15043 * 15044 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15045 * The requirements are encoded with 15046 * {@link android.view.View.MeasureSpec}. 15047 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15048 * The requirements are encoded with 15049 * {@link android.view.View.MeasureSpec}. 15050 * 15051 * @see #getMeasuredWidth() 15052 * @see #getMeasuredHeight() 15053 * @see #setMeasuredDimension(int, int) 15054 * @see #getSuggestedMinimumHeight() 15055 * @see #getSuggestedMinimumWidth() 15056 * @see android.view.View.MeasureSpec#getMode(int) 15057 * @see android.view.View.MeasureSpec#getSize(int) 15058 */ 15059 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15060 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15061 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15062 } 15063 15064 /** 15065 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15066 * measured width and measured height. Failing to do so will trigger an 15067 * exception at measurement time.</p> 15068 * 15069 * @param measuredWidth The measured width of this view. May be a complex 15070 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15071 * {@link #MEASURED_STATE_TOO_SMALL}. 15072 * @param measuredHeight The measured height of this view. May be a complex 15073 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15074 * {@link #MEASURED_STATE_TOO_SMALL}. 15075 */ 15076 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15077 mMeasuredWidth = measuredWidth; 15078 mMeasuredHeight = measuredHeight; 15079 15080 mPrivateFlags |= MEASURED_DIMENSION_SET; 15081 } 15082 15083 /** 15084 * Merge two states as returned by {@link #getMeasuredState()}. 15085 * @param curState The current state as returned from a view or the result 15086 * of combining multiple views. 15087 * @param newState The new view state to combine. 15088 * @return Returns a new integer reflecting the combination of the two 15089 * states. 15090 */ 15091 public static int combineMeasuredStates(int curState, int newState) { 15092 return curState | newState; 15093 } 15094 15095 /** 15096 * Version of {@link #resolveSizeAndState(int, int, int)} 15097 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15098 */ 15099 public static int resolveSize(int size, int measureSpec) { 15100 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15101 } 15102 15103 /** 15104 * Utility to reconcile a desired size and state, with constraints imposed 15105 * by a MeasureSpec. Will take the desired size, unless a different size 15106 * is imposed by the constraints. The returned value is a compound integer, 15107 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15108 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15109 * size is smaller than the size the view wants to be. 15110 * 15111 * @param size How big the view wants to be 15112 * @param measureSpec Constraints imposed by the parent 15113 * @return Size information bit mask as defined by 15114 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15115 */ 15116 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15117 int result = size; 15118 int specMode = MeasureSpec.getMode(measureSpec); 15119 int specSize = MeasureSpec.getSize(measureSpec); 15120 switch (specMode) { 15121 case MeasureSpec.UNSPECIFIED: 15122 result = size; 15123 break; 15124 case MeasureSpec.AT_MOST: 15125 if (specSize < size) { 15126 result = specSize | MEASURED_STATE_TOO_SMALL; 15127 } else { 15128 result = size; 15129 } 15130 break; 15131 case MeasureSpec.EXACTLY: 15132 result = specSize; 15133 break; 15134 } 15135 return result | (childMeasuredState&MEASURED_STATE_MASK); 15136 } 15137 15138 /** 15139 * Utility to return a default size. Uses the supplied size if the 15140 * MeasureSpec imposed no constraints. Will get larger if allowed 15141 * by the MeasureSpec. 15142 * 15143 * @param size Default size for this view 15144 * @param measureSpec Constraints imposed by the parent 15145 * @return The size this view should be. 15146 */ 15147 public static int getDefaultSize(int size, int measureSpec) { 15148 int result = size; 15149 int specMode = MeasureSpec.getMode(measureSpec); 15150 int specSize = MeasureSpec.getSize(measureSpec); 15151 15152 switch (specMode) { 15153 case MeasureSpec.UNSPECIFIED: 15154 result = size; 15155 break; 15156 case MeasureSpec.AT_MOST: 15157 case MeasureSpec.EXACTLY: 15158 result = specSize; 15159 break; 15160 } 15161 return result; 15162 } 15163 15164 /** 15165 * Returns the suggested minimum height that the view should use. This 15166 * returns the maximum of the view's minimum height 15167 * and the background's minimum height 15168 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15169 * <p> 15170 * When being used in {@link #onMeasure(int, int)}, the caller should still 15171 * ensure the returned height is within the requirements of the parent. 15172 * 15173 * @return The suggested minimum height of the view. 15174 */ 15175 protected int getSuggestedMinimumHeight() { 15176 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15177 15178 } 15179 15180 /** 15181 * Returns the suggested minimum width that the view should use. This 15182 * returns the maximum of the view's minimum width) 15183 * and the background's minimum width 15184 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15185 * <p> 15186 * When being used in {@link #onMeasure(int, int)}, the caller should still 15187 * ensure the returned width is within the requirements of the parent. 15188 * 15189 * @return The suggested minimum width of the view. 15190 */ 15191 protected int getSuggestedMinimumWidth() { 15192 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15193 } 15194 15195 /** 15196 * Returns the minimum height of the view. 15197 * 15198 * @return the minimum height the view will try to be. 15199 * 15200 * @see #setMinimumHeight(int) 15201 * 15202 * @attr ref android.R.styleable#View_minHeight 15203 */ 15204 public int getMinimumHeight() { 15205 return mMinHeight; 15206 } 15207 15208 /** 15209 * Sets the minimum height of the view. It is not guaranteed the view will 15210 * be able to achieve this minimum height (for example, if its parent layout 15211 * constrains it with less available height). 15212 * 15213 * @param minHeight The minimum height the view will try to be. 15214 * 15215 * @see #getMinimumHeight() 15216 * 15217 * @attr ref android.R.styleable#View_minHeight 15218 */ 15219 public void setMinimumHeight(int minHeight) { 15220 mMinHeight = minHeight; 15221 requestLayout(); 15222 } 15223 15224 /** 15225 * Returns the minimum width of the view. 15226 * 15227 * @return the minimum width the view will try to be. 15228 * 15229 * @see #setMinimumWidth(int) 15230 * 15231 * @attr ref android.R.styleable#View_minWidth 15232 */ 15233 public int getMinimumWidth() { 15234 return mMinWidth; 15235 } 15236 15237 /** 15238 * Sets the minimum width of the view. It is not guaranteed the view will 15239 * be able to achieve this minimum width (for example, if its parent layout 15240 * constrains it with less available width). 15241 * 15242 * @param minWidth The minimum width the view will try to be. 15243 * 15244 * @see #getMinimumWidth() 15245 * 15246 * @attr ref android.R.styleable#View_minWidth 15247 */ 15248 public void setMinimumWidth(int minWidth) { 15249 mMinWidth = minWidth; 15250 requestLayout(); 15251 15252 } 15253 15254 /** 15255 * Get the animation currently associated with this view. 15256 * 15257 * @return The animation that is currently playing or 15258 * scheduled to play for this view. 15259 */ 15260 public Animation getAnimation() { 15261 return mCurrentAnimation; 15262 } 15263 15264 /** 15265 * Start the specified animation now. 15266 * 15267 * @param animation the animation to start now 15268 */ 15269 public void startAnimation(Animation animation) { 15270 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15271 setAnimation(animation); 15272 invalidateParentCaches(); 15273 invalidate(true); 15274 } 15275 15276 /** 15277 * Cancels any animations for this view. 15278 */ 15279 public void clearAnimation() { 15280 if (mCurrentAnimation != null) { 15281 mCurrentAnimation.detach(); 15282 } 15283 mCurrentAnimation = null; 15284 invalidateParentIfNeeded(); 15285 } 15286 15287 /** 15288 * Sets the next animation to play for this view. 15289 * If you want the animation to play immediately, use 15290 * {@link #startAnimation(android.view.animation.Animation)} instead. 15291 * This method provides allows fine-grained 15292 * control over the start time and invalidation, but you 15293 * must make sure that 1) the animation has a start time set, and 15294 * 2) the view's parent (which controls animations on its children) 15295 * will be invalidated when the animation is supposed to 15296 * start. 15297 * 15298 * @param animation The next animation, or null. 15299 */ 15300 public void setAnimation(Animation animation) { 15301 mCurrentAnimation = animation; 15302 15303 if (animation != null) { 15304 // If the screen is off assume the animation start time is now instead of 15305 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15306 // would cause the animation to start when the screen turns back on 15307 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15308 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15309 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15310 } 15311 animation.reset(); 15312 } 15313 } 15314 15315 /** 15316 * Invoked by a parent ViewGroup to notify the start of the animation 15317 * currently associated with this view. If you override this method, 15318 * always call super.onAnimationStart(); 15319 * 15320 * @see #setAnimation(android.view.animation.Animation) 15321 * @see #getAnimation() 15322 */ 15323 protected void onAnimationStart() { 15324 mPrivateFlags |= ANIMATION_STARTED; 15325 } 15326 15327 /** 15328 * Invoked by a parent ViewGroup to notify the end of the animation 15329 * currently associated with this view. If you override this method, 15330 * always call super.onAnimationEnd(); 15331 * 15332 * @see #setAnimation(android.view.animation.Animation) 15333 * @see #getAnimation() 15334 */ 15335 protected void onAnimationEnd() { 15336 mPrivateFlags &= ~ANIMATION_STARTED; 15337 } 15338 15339 /** 15340 * Invoked if there is a Transform that involves alpha. Subclass that can 15341 * draw themselves with the specified alpha should return true, and then 15342 * respect that alpha when their onDraw() is called. If this returns false 15343 * then the view may be redirected to draw into an offscreen buffer to 15344 * fulfill the request, which will look fine, but may be slower than if the 15345 * subclass handles it internally. The default implementation returns false. 15346 * 15347 * @param alpha The alpha (0..255) to apply to the view's drawing 15348 * @return true if the view can draw with the specified alpha. 15349 */ 15350 protected boolean onSetAlpha(int alpha) { 15351 return false; 15352 } 15353 15354 /** 15355 * This is used by the RootView to perform an optimization when 15356 * the view hierarchy contains one or several SurfaceView. 15357 * SurfaceView is always considered transparent, but its children are not, 15358 * therefore all View objects remove themselves from the global transparent 15359 * region (passed as a parameter to this function). 15360 * 15361 * @param region The transparent region for this ViewAncestor (window). 15362 * 15363 * @return Returns true if the effective visibility of the view at this 15364 * point is opaque, regardless of the transparent region; returns false 15365 * if it is possible for underlying windows to be seen behind the view. 15366 * 15367 * {@hide} 15368 */ 15369 public boolean gatherTransparentRegion(Region region) { 15370 final AttachInfo attachInfo = mAttachInfo; 15371 if (region != null && attachInfo != null) { 15372 final int pflags = mPrivateFlags; 15373 if ((pflags & SKIP_DRAW) == 0) { 15374 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15375 // remove it from the transparent region. 15376 final int[] location = attachInfo.mTransparentLocation; 15377 getLocationInWindow(location); 15378 region.op(location[0], location[1], location[0] + mRight - mLeft, 15379 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15380 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15381 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15382 // exists, so we remove the background drawable's non-transparent 15383 // parts from this transparent region. 15384 applyDrawableToTransparentRegion(mBackground, region); 15385 } 15386 } 15387 return true; 15388 } 15389 15390 /** 15391 * Play a sound effect for this view. 15392 * 15393 * <p>The framework will play sound effects for some built in actions, such as 15394 * clicking, but you may wish to play these effects in your widget, 15395 * for instance, for internal navigation. 15396 * 15397 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15398 * {@link #isSoundEffectsEnabled()} is true. 15399 * 15400 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15401 */ 15402 public void playSoundEffect(int soundConstant) { 15403 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15404 return; 15405 } 15406 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15407 } 15408 15409 /** 15410 * BZZZTT!!1! 15411 * 15412 * <p>Provide haptic feedback to the user for this view. 15413 * 15414 * <p>The framework will provide haptic feedback for some built in actions, 15415 * such as long presses, but you may wish to provide feedback for your 15416 * own widget. 15417 * 15418 * <p>The feedback will only be performed if 15419 * {@link #isHapticFeedbackEnabled()} is true. 15420 * 15421 * @param feedbackConstant One of the constants defined in 15422 * {@link HapticFeedbackConstants} 15423 */ 15424 public boolean performHapticFeedback(int feedbackConstant) { 15425 return performHapticFeedback(feedbackConstant, 0); 15426 } 15427 15428 /** 15429 * BZZZTT!!1! 15430 * 15431 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15432 * 15433 * @param feedbackConstant One of the constants defined in 15434 * {@link HapticFeedbackConstants} 15435 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15436 */ 15437 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15438 if (mAttachInfo == null) { 15439 return false; 15440 } 15441 //noinspection SimplifiableIfStatement 15442 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15443 && !isHapticFeedbackEnabled()) { 15444 return false; 15445 } 15446 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15447 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15448 } 15449 15450 /** 15451 * Request that the visibility of the status bar or other screen/window 15452 * decorations be changed. 15453 * 15454 * <p>This method is used to put the over device UI into temporary modes 15455 * where the user's attention is focused more on the application content, 15456 * by dimming or hiding surrounding system affordances. This is typically 15457 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15458 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15459 * to be placed behind the action bar (and with these flags other system 15460 * affordances) so that smooth transitions between hiding and showing them 15461 * can be done. 15462 * 15463 * <p>Two representative examples of the use of system UI visibility is 15464 * implementing a content browsing application (like a magazine reader) 15465 * and a video playing application. 15466 * 15467 * <p>The first code shows a typical implementation of a View in a content 15468 * browsing application. In this implementation, the application goes 15469 * into a content-oriented mode by hiding the status bar and action bar, 15470 * and putting the navigation elements into lights out mode. The user can 15471 * then interact with content while in this mode. Such an application should 15472 * provide an easy way for the user to toggle out of the mode (such as to 15473 * check information in the status bar or access notifications). In the 15474 * implementation here, this is done simply by tapping on the content. 15475 * 15476 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15477 * content} 15478 * 15479 * <p>This second code sample shows a typical implementation of a View 15480 * in a video playing application. In this situation, while the video is 15481 * playing the application would like to go into a complete full-screen mode, 15482 * to use as much of the display as possible for the video. When in this state 15483 * the user can not interact with the application; the system intercepts 15484 * touching on the screen to pop the UI out of full screen mode. See 15485 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15486 * 15487 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15488 * content} 15489 * 15490 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15491 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15492 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15493 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15494 */ 15495 public void setSystemUiVisibility(int visibility) { 15496 if (visibility != mSystemUiVisibility) { 15497 mSystemUiVisibility = visibility; 15498 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15499 mParent.recomputeViewAttributes(this); 15500 } 15501 } 15502 } 15503 15504 /** 15505 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15506 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15507 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15508 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15509 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15510 */ 15511 public int getSystemUiVisibility() { 15512 return mSystemUiVisibility; 15513 } 15514 15515 /** 15516 * Returns the current system UI visibility that is currently set for 15517 * the entire window. This is the combination of the 15518 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15519 * views in the window. 15520 */ 15521 public int getWindowSystemUiVisibility() { 15522 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15523 } 15524 15525 /** 15526 * Override to find out when the window's requested system UI visibility 15527 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15528 * This is different from the callbacks recieved through 15529 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15530 * in that this is only telling you about the local request of the window, 15531 * not the actual values applied by the system. 15532 */ 15533 public void onWindowSystemUiVisibilityChanged(int visible) { 15534 } 15535 15536 /** 15537 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15538 * the view hierarchy. 15539 */ 15540 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15541 onWindowSystemUiVisibilityChanged(visible); 15542 } 15543 15544 /** 15545 * Set a listener to receive callbacks when the visibility of the system bar changes. 15546 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15547 */ 15548 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15549 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15550 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15551 mParent.recomputeViewAttributes(this); 15552 } 15553 } 15554 15555 /** 15556 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15557 * the view hierarchy. 15558 */ 15559 public void dispatchSystemUiVisibilityChanged(int visibility) { 15560 ListenerInfo li = mListenerInfo; 15561 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15562 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15563 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15564 } 15565 } 15566 15567 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15568 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15569 if (val != mSystemUiVisibility) { 15570 setSystemUiVisibility(val); 15571 return true; 15572 } 15573 return false; 15574 } 15575 15576 /** @hide */ 15577 public void setDisabledSystemUiVisibility(int flags) { 15578 if (mAttachInfo != null) { 15579 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15580 mAttachInfo.mDisabledSystemUiVisibility = flags; 15581 if (mParent != null) { 15582 mParent.recomputeViewAttributes(this); 15583 } 15584 } 15585 } 15586 } 15587 15588 /** 15589 * Creates an image that the system displays during the drag and drop 15590 * operation. This is called a "drag shadow". The default implementation 15591 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15592 * appearance as the given View. The default also positions the center of the drag shadow 15593 * directly under the touch point. If no View is provided (the constructor with no parameters 15594 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15595 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15596 * default is an invisible drag shadow. 15597 * <p> 15598 * You are not required to use the View you provide to the constructor as the basis of the 15599 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15600 * anything you want as the drag shadow. 15601 * </p> 15602 * <p> 15603 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15604 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15605 * size and position of the drag shadow. It uses this data to construct a 15606 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15607 * so that your application can draw the shadow image in the Canvas. 15608 * </p> 15609 * 15610 * <div class="special reference"> 15611 * <h3>Developer Guides</h3> 15612 * <p>For a guide to implementing drag and drop features, read the 15613 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15614 * </div> 15615 */ 15616 public static class DragShadowBuilder { 15617 private final WeakReference<View> mView; 15618 15619 /** 15620 * Constructs a shadow image builder based on a View. By default, the resulting drag 15621 * shadow will have the same appearance and dimensions as the View, with the touch point 15622 * over the center of the View. 15623 * @param view A View. Any View in scope can be used. 15624 */ 15625 public DragShadowBuilder(View view) { 15626 mView = new WeakReference<View>(view); 15627 } 15628 15629 /** 15630 * Construct a shadow builder object with no associated View. This 15631 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15632 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15633 * to supply the drag shadow's dimensions and appearance without 15634 * reference to any View object. If they are not overridden, then the result is an 15635 * invisible drag shadow. 15636 */ 15637 public DragShadowBuilder() { 15638 mView = new WeakReference<View>(null); 15639 } 15640 15641 /** 15642 * Returns the View object that had been passed to the 15643 * {@link #View.DragShadowBuilder(View)} 15644 * constructor. If that View parameter was {@code null} or if the 15645 * {@link #View.DragShadowBuilder()} 15646 * constructor was used to instantiate the builder object, this method will return 15647 * null. 15648 * 15649 * @return The View object associate with this builder object. 15650 */ 15651 @SuppressWarnings({"JavadocReference"}) 15652 final public View getView() { 15653 return mView.get(); 15654 } 15655 15656 /** 15657 * Provides the metrics for the shadow image. These include the dimensions of 15658 * the shadow image, and the point within that shadow that should 15659 * be centered under the touch location while dragging. 15660 * <p> 15661 * The default implementation sets the dimensions of the shadow to be the 15662 * same as the dimensions of the View itself and centers the shadow under 15663 * the touch point. 15664 * </p> 15665 * 15666 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15667 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15668 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15669 * image. 15670 * 15671 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15672 * shadow image that should be underneath the touch point during the drag and drop 15673 * operation. Your application must set {@link android.graphics.Point#x} to the 15674 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15675 */ 15676 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15677 final View view = mView.get(); 15678 if (view != null) { 15679 shadowSize.set(view.getWidth(), view.getHeight()); 15680 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15681 } else { 15682 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15683 } 15684 } 15685 15686 /** 15687 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15688 * based on the dimensions it received from the 15689 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15690 * 15691 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15692 */ 15693 public void onDrawShadow(Canvas canvas) { 15694 final View view = mView.get(); 15695 if (view != null) { 15696 view.draw(canvas); 15697 } else { 15698 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15699 } 15700 } 15701 } 15702 15703 /** 15704 * Starts a drag and drop operation. When your application calls this method, it passes a 15705 * {@link android.view.View.DragShadowBuilder} object to the system. The 15706 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15707 * to get metrics for the drag shadow, and then calls the object's 15708 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15709 * <p> 15710 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15711 * drag events to all the View objects in your application that are currently visible. It does 15712 * this either by calling the View object's drag listener (an implementation of 15713 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15714 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15715 * Both are passed a {@link android.view.DragEvent} object that has a 15716 * {@link android.view.DragEvent#getAction()} value of 15717 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15718 * </p> 15719 * <p> 15720 * Your application can invoke startDrag() on any attached View object. The View object does not 15721 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15722 * be related to the View the user selected for dragging. 15723 * </p> 15724 * @param data A {@link android.content.ClipData} object pointing to the data to be 15725 * transferred by the drag and drop operation. 15726 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15727 * drag shadow. 15728 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15729 * drop operation. This Object is put into every DragEvent object sent by the system during the 15730 * current drag. 15731 * <p> 15732 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15733 * to the target Views. For example, it can contain flags that differentiate between a 15734 * a copy operation and a move operation. 15735 * </p> 15736 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15737 * so the parameter should be set to 0. 15738 * @return {@code true} if the method completes successfully, or 15739 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15740 * do a drag, and so no drag operation is in progress. 15741 */ 15742 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15743 Object myLocalState, int flags) { 15744 if (ViewDebug.DEBUG_DRAG) { 15745 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15746 } 15747 boolean okay = false; 15748 15749 Point shadowSize = new Point(); 15750 Point shadowTouchPoint = new Point(); 15751 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15752 15753 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15754 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15755 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15756 } 15757 15758 if (ViewDebug.DEBUG_DRAG) { 15759 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15760 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15761 } 15762 Surface surface = new Surface(); 15763 try { 15764 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15765 flags, shadowSize.x, shadowSize.y, surface); 15766 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15767 + " surface=" + surface); 15768 if (token != null) { 15769 Canvas canvas = surface.lockCanvas(null); 15770 try { 15771 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15772 shadowBuilder.onDrawShadow(canvas); 15773 } finally { 15774 surface.unlockCanvasAndPost(canvas); 15775 } 15776 15777 final ViewRootImpl root = getViewRootImpl(); 15778 15779 // Cache the local state object for delivery with DragEvents 15780 root.setLocalDragState(myLocalState); 15781 15782 // repurpose 'shadowSize' for the last touch point 15783 root.getLastTouchPoint(shadowSize); 15784 15785 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15786 shadowSize.x, shadowSize.y, 15787 shadowTouchPoint.x, shadowTouchPoint.y, data); 15788 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15789 15790 // Off and running! Release our local surface instance; the drag 15791 // shadow surface is now managed by the system process. 15792 surface.release(); 15793 } 15794 } catch (Exception e) { 15795 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15796 surface.destroy(); 15797 } 15798 15799 return okay; 15800 } 15801 15802 /** 15803 * Handles drag events sent by the system following a call to 15804 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15805 *<p> 15806 * When the system calls this method, it passes a 15807 * {@link android.view.DragEvent} object. A call to 15808 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15809 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15810 * operation. 15811 * @param event The {@link android.view.DragEvent} sent by the system. 15812 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15813 * in DragEvent, indicating the type of drag event represented by this object. 15814 * @return {@code true} if the method was successful, otherwise {@code false}. 15815 * <p> 15816 * The method should return {@code true} in response to an action type of 15817 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15818 * operation. 15819 * </p> 15820 * <p> 15821 * The method should also return {@code true} in response to an action type of 15822 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15823 * {@code false} if it didn't. 15824 * </p> 15825 */ 15826 public boolean onDragEvent(DragEvent event) { 15827 return false; 15828 } 15829 15830 /** 15831 * Detects if this View is enabled and has a drag event listener. 15832 * If both are true, then it calls the drag event listener with the 15833 * {@link android.view.DragEvent} it received. If the drag event listener returns 15834 * {@code true}, then dispatchDragEvent() returns {@code true}. 15835 * <p> 15836 * For all other cases, the method calls the 15837 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15838 * method and returns its result. 15839 * </p> 15840 * <p> 15841 * This ensures that a drag event is always consumed, even if the View does not have a drag 15842 * event listener. However, if the View has a listener and the listener returns true, then 15843 * onDragEvent() is not called. 15844 * </p> 15845 */ 15846 public boolean dispatchDragEvent(DragEvent event) { 15847 //noinspection SimplifiableIfStatement 15848 ListenerInfo li = mListenerInfo; 15849 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15850 && li.mOnDragListener.onDrag(this, event)) { 15851 return true; 15852 } 15853 return onDragEvent(event); 15854 } 15855 15856 boolean canAcceptDrag() { 15857 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15858 } 15859 15860 /** 15861 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15862 * it is ever exposed at all. 15863 * @hide 15864 */ 15865 public void onCloseSystemDialogs(String reason) { 15866 } 15867 15868 /** 15869 * Given a Drawable whose bounds have been set to draw into this view, 15870 * update a Region being computed for 15871 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15872 * that any non-transparent parts of the Drawable are removed from the 15873 * given transparent region. 15874 * 15875 * @param dr The Drawable whose transparency is to be applied to the region. 15876 * @param region A Region holding the current transparency information, 15877 * where any parts of the region that are set are considered to be 15878 * transparent. On return, this region will be modified to have the 15879 * transparency information reduced by the corresponding parts of the 15880 * Drawable that are not transparent. 15881 * {@hide} 15882 */ 15883 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15884 if (DBG) { 15885 Log.i("View", "Getting transparent region for: " + this); 15886 } 15887 final Region r = dr.getTransparentRegion(); 15888 final Rect db = dr.getBounds(); 15889 final AttachInfo attachInfo = mAttachInfo; 15890 if (r != null && attachInfo != null) { 15891 final int w = getRight()-getLeft(); 15892 final int h = getBottom()-getTop(); 15893 if (db.left > 0) { 15894 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15895 r.op(0, 0, db.left, h, Region.Op.UNION); 15896 } 15897 if (db.right < w) { 15898 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15899 r.op(db.right, 0, w, h, Region.Op.UNION); 15900 } 15901 if (db.top > 0) { 15902 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15903 r.op(0, 0, w, db.top, Region.Op.UNION); 15904 } 15905 if (db.bottom < h) { 15906 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15907 r.op(0, db.bottom, w, h, Region.Op.UNION); 15908 } 15909 final int[] location = attachInfo.mTransparentLocation; 15910 getLocationInWindow(location); 15911 r.translate(location[0], location[1]); 15912 region.op(r, Region.Op.INTERSECT); 15913 } else { 15914 region.op(db, Region.Op.DIFFERENCE); 15915 } 15916 } 15917 15918 private void checkForLongClick(int delayOffset) { 15919 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15920 mHasPerformedLongPress = false; 15921 15922 if (mPendingCheckForLongPress == null) { 15923 mPendingCheckForLongPress = new CheckForLongPress(); 15924 } 15925 mPendingCheckForLongPress.rememberWindowAttachCount(); 15926 postDelayed(mPendingCheckForLongPress, 15927 ViewConfiguration.getLongPressTimeout() - delayOffset); 15928 } 15929 } 15930 15931 /** 15932 * Inflate a view from an XML resource. This convenience method wraps the {@link 15933 * LayoutInflater} class, which provides a full range of options for view inflation. 15934 * 15935 * @param context The Context object for your activity or application. 15936 * @param resource The resource ID to inflate 15937 * @param root A view group that will be the parent. Used to properly inflate the 15938 * layout_* parameters. 15939 * @see LayoutInflater 15940 */ 15941 public static View inflate(Context context, int resource, ViewGroup root) { 15942 LayoutInflater factory = LayoutInflater.from(context); 15943 return factory.inflate(resource, root); 15944 } 15945 15946 /** 15947 * Scroll the view with standard behavior for scrolling beyond the normal 15948 * content boundaries. Views that call this method should override 15949 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15950 * results of an over-scroll operation. 15951 * 15952 * Views can use this method to handle any touch or fling-based scrolling. 15953 * 15954 * @param deltaX Change in X in pixels 15955 * @param deltaY Change in Y in pixels 15956 * @param scrollX Current X scroll value in pixels before applying deltaX 15957 * @param scrollY Current Y scroll value in pixels before applying deltaY 15958 * @param scrollRangeX Maximum content scroll range along the X axis 15959 * @param scrollRangeY Maximum content scroll range along the Y axis 15960 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15961 * along the X axis. 15962 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15963 * along the Y axis. 15964 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15965 * @return true if scrolling was clamped to an over-scroll boundary along either 15966 * axis, false otherwise. 15967 */ 15968 @SuppressWarnings({"UnusedParameters"}) 15969 protected boolean overScrollBy(int deltaX, int deltaY, 15970 int scrollX, int scrollY, 15971 int scrollRangeX, int scrollRangeY, 15972 int maxOverScrollX, int maxOverScrollY, 15973 boolean isTouchEvent) { 15974 final int overScrollMode = mOverScrollMode; 15975 final boolean canScrollHorizontal = 15976 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15977 final boolean canScrollVertical = 15978 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15979 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15980 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15981 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15982 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15983 15984 int newScrollX = scrollX + deltaX; 15985 if (!overScrollHorizontal) { 15986 maxOverScrollX = 0; 15987 } 15988 15989 int newScrollY = scrollY + deltaY; 15990 if (!overScrollVertical) { 15991 maxOverScrollY = 0; 15992 } 15993 15994 // Clamp values if at the limits and record 15995 final int left = -maxOverScrollX; 15996 final int right = maxOverScrollX + scrollRangeX; 15997 final int top = -maxOverScrollY; 15998 final int bottom = maxOverScrollY + scrollRangeY; 15999 16000 boolean clampedX = false; 16001 if (newScrollX > right) { 16002 newScrollX = right; 16003 clampedX = true; 16004 } else if (newScrollX < left) { 16005 newScrollX = left; 16006 clampedX = true; 16007 } 16008 16009 boolean clampedY = false; 16010 if (newScrollY > bottom) { 16011 newScrollY = bottom; 16012 clampedY = true; 16013 } else if (newScrollY < top) { 16014 newScrollY = top; 16015 clampedY = true; 16016 } 16017 16018 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16019 16020 return clampedX || clampedY; 16021 } 16022 16023 /** 16024 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16025 * respond to the results of an over-scroll operation. 16026 * 16027 * @param scrollX New X scroll value in pixels 16028 * @param scrollY New Y scroll value in pixels 16029 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16030 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16031 */ 16032 protected void onOverScrolled(int scrollX, int scrollY, 16033 boolean clampedX, boolean clampedY) { 16034 // Intentionally empty. 16035 } 16036 16037 /** 16038 * Returns the over-scroll mode for this view. The result will be 16039 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16040 * (allow over-scrolling only if the view content is larger than the container), 16041 * or {@link #OVER_SCROLL_NEVER}. 16042 * 16043 * @return This view's over-scroll mode. 16044 */ 16045 public int getOverScrollMode() { 16046 return mOverScrollMode; 16047 } 16048 16049 /** 16050 * Set the over-scroll mode for this view. Valid over-scroll modes are 16051 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16052 * (allow over-scrolling only if the view content is larger than the container), 16053 * or {@link #OVER_SCROLL_NEVER}. 16054 * 16055 * Setting the over-scroll mode of a view will have an effect only if the 16056 * view is capable of scrolling. 16057 * 16058 * @param overScrollMode The new over-scroll mode for this view. 16059 */ 16060 public void setOverScrollMode(int overScrollMode) { 16061 if (overScrollMode != OVER_SCROLL_ALWAYS && 16062 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16063 overScrollMode != OVER_SCROLL_NEVER) { 16064 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16065 } 16066 mOverScrollMode = overScrollMode; 16067 } 16068 16069 /** 16070 * Gets a scale factor that determines the distance the view should scroll 16071 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16072 * @return The vertical scroll scale factor. 16073 * @hide 16074 */ 16075 protected float getVerticalScrollFactor() { 16076 if (mVerticalScrollFactor == 0) { 16077 TypedValue outValue = new TypedValue(); 16078 if (!mContext.getTheme().resolveAttribute( 16079 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16080 throw new IllegalStateException( 16081 "Expected theme to define listPreferredItemHeight."); 16082 } 16083 mVerticalScrollFactor = outValue.getDimension( 16084 mContext.getResources().getDisplayMetrics()); 16085 } 16086 return mVerticalScrollFactor; 16087 } 16088 16089 /** 16090 * Gets a scale factor that determines the distance the view should scroll 16091 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16092 * @return The horizontal scroll scale factor. 16093 * @hide 16094 */ 16095 protected float getHorizontalScrollFactor() { 16096 // TODO: Should use something else. 16097 return getVerticalScrollFactor(); 16098 } 16099 16100 /** 16101 * Return the value specifying the text direction or policy that was set with 16102 * {@link #setTextDirection(int)}. 16103 * 16104 * @return the defined text direction. It can be one of: 16105 * 16106 * {@link #TEXT_DIRECTION_INHERIT}, 16107 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16108 * {@link #TEXT_DIRECTION_ANY_RTL}, 16109 * {@link #TEXT_DIRECTION_LTR}, 16110 * {@link #TEXT_DIRECTION_RTL}, 16111 * {@link #TEXT_DIRECTION_LOCALE} 16112 * @hide 16113 */ 16114 @ViewDebug.ExportedProperty(category = "text", mapping = { 16115 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16116 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16117 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16118 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16119 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16120 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16121 }) 16122 public int getTextDirection() { 16123 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16124 } 16125 16126 /** 16127 * Set the text direction. 16128 * 16129 * @param textDirection the direction to set. Should be one of: 16130 * 16131 * {@link #TEXT_DIRECTION_INHERIT}, 16132 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16133 * {@link #TEXT_DIRECTION_ANY_RTL}, 16134 * {@link #TEXT_DIRECTION_LTR}, 16135 * {@link #TEXT_DIRECTION_RTL}, 16136 * {@link #TEXT_DIRECTION_LOCALE} 16137 * @hide 16138 */ 16139 public void setTextDirection(int textDirection) { 16140 if (getTextDirection() != textDirection) { 16141 // Reset the current text direction and the resolved one 16142 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16143 resetResolvedTextDirection(); 16144 // Set the new text direction 16145 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16146 // Refresh 16147 requestLayout(); 16148 invalidate(true); 16149 } 16150 } 16151 16152 /** 16153 * Return the resolved text direction. 16154 * 16155 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16156 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16157 * up the parent chain of the view. if there is no parent, then it will return the default 16158 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16159 * 16160 * @return the resolved text direction. Returns one of: 16161 * 16162 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16163 * {@link #TEXT_DIRECTION_ANY_RTL}, 16164 * {@link #TEXT_DIRECTION_LTR}, 16165 * {@link #TEXT_DIRECTION_RTL}, 16166 * {@link #TEXT_DIRECTION_LOCALE} 16167 * @hide 16168 */ 16169 public int getResolvedTextDirection() { 16170 // The text direction will be resolved only if needed 16171 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16172 resolveTextDirection(); 16173 } 16174 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16175 } 16176 16177 /** 16178 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16179 * resolution is done. 16180 * @hide 16181 */ 16182 public void resolveTextDirection() { 16183 // Reset any previous text direction resolution 16184 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16185 16186 if (hasRtlSupport()) { 16187 // Set resolved text direction flag depending on text direction flag 16188 final int textDirection = getTextDirection(); 16189 switch(textDirection) { 16190 case TEXT_DIRECTION_INHERIT: 16191 if (canResolveTextDirection()) { 16192 ViewGroup viewGroup = ((ViewGroup) mParent); 16193 16194 // Set current resolved direction to the same value as the parent's one 16195 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16196 switch (parentResolvedDirection) { 16197 case TEXT_DIRECTION_FIRST_STRONG: 16198 case TEXT_DIRECTION_ANY_RTL: 16199 case TEXT_DIRECTION_LTR: 16200 case TEXT_DIRECTION_RTL: 16201 case TEXT_DIRECTION_LOCALE: 16202 mPrivateFlags2 |= 16203 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16204 break; 16205 default: 16206 // Default resolved direction is "first strong" heuristic 16207 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16208 } 16209 } else { 16210 // We cannot do the resolution if there is no parent, so use the default one 16211 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16212 } 16213 break; 16214 case TEXT_DIRECTION_FIRST_STRONG: 16215 case TEXT_DIRECTION_ANY_RTL: 16216 case TEXT_DIRECTION_LTR: 16217 case TEXT_DIRECTION_RTL: 16218 case TEXT_DIRECTION_LOCALE: 16219 // Resolved direction is the same as text direction 16220 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16221 break; 16222 default: 16223 // Default resolved direction is "first strong" heuristic 16224 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16225 } 16226 } else { 16227 // Default resolved direction is "first strong" heuristic 16228 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16229 } 16230 16231 // Set to resolved 16232 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16233 onResolvedTextDirectionChanged(); 16234 } 16235 16236 /** 16237 * Called when text direction has been resolved. Subclasses that care about text direction 16238 * resolution should override this method. 16239 * 16240 * The default implementation does nothing. 16241 * @hide 16242 */ 16243 public void onResolvedTextDirectionChanged() { 16244 } 16245 16246 /** 16247 * Check if text direction resolution can be done. 16248 * 16249 * @return true if text direction resolution can be done otherwise return false. 16250 * @hide 16251 */ 16252 public boolean canResolveTextDirection() { 16253 switch (getTextDirection()) { 16254 case TEXT_DIRECTION_INHERIT: 16255 return (mParent != null) && (mParent instanceof ViewGroup); 16256 default: 16257 return true; 16258 } 16259 } 16260 16261 /** 16262 * Reset resolved text direction. Text direction can be resolved with a call to 16263 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16264 * reset is done. 16265 * @hide 16266 */ 16267 public void resetResolvedTextDirection() { 16268 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16269 onResolvedTextDirectionReset(); 16270 } 16271 16272 /** 16273 * Called when text direction is reset. Subclasses that care about text direction reset should 16274 * override this method and do a reset of the text direction of their children. The default 16275 * implementation does nothing. 16276 * @hide 16277 */ 16278 public void onResolvedTextDirectionReset() { 16279 } 16280 16281 /** 16282 * Return the value specifying the text alignment or policy that was set with 16283 * {@link #setTextAlignment(int)}. 16284 * 16285 * @return the defined text alignment. It can be one of: 16286 * 16287 * {@link #TEXT_ALIGNMENT_INHERIT}, 16288 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16289 * {@link #TEXT_ALIGNMENT_CENTER}, 16290 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16291 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16292 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16293 * {@link #TEXT_ALIGNMENT_VIEW_END} 16294 * @hide 16295 */ 16296 @ViewDebug.ExportedProperty(category = "text", mapping = { 16297 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16298 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16299 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16300 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16301 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16302 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16303 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16304 }) 16305 public int getTextAlignment() { 16306 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16307 } 16308 16309 /** 16310 * Set the text alignment. 16311 * 16312 * @param textAlignment The text alignment to set. Should be one of 16313 * 16314 * {@link #TEXT_ALIGNMENT_INHERIT}, 16315 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16316 * {@link #TEXT_ALIGNMENT_CENTER}, 16317 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16318 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16319 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16320 * {@link #TEXT_ALIGNMENT_VIEW_END} 16321 * 16322 * @attr ref android.R.styleable#View_textAlignment 16323 * @hide 16324 */ 16325 public void setTextAlignment(int textAlignment) { 16326 if (textAlignment != getTextAlignment()) { 16327 // Reset the current and resolved text alignment 16328 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16329 resetResolvedTextAlignment(); 16330 // Set the new text alignment 16331 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16332 // Refresh 16333 requestLayout(); 16334 invalidate(true); 16335 } 16336 } 16337 16338 /** 16339 * Return the resolved text alignment. 16340 * 16341 * The resolved text alignment. This needs resolution if the value is 16342 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16343 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16344 * 16345 * @return the resolved text alignment. Returns one of: 16346 * 16347 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16348 * {@link #TEXT_ALIGNMENT_CENTER}, 16349 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16350 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16351 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16352 * {@link #TEXT_ALIGNMENT_VIEW_END} 16353 * @hide 16354 */ 16355 @ViewDebug.ExportedProperty(category = "text", mapping = { 16356 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16357 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16358 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16359 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16360 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16361 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16362 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16363 }) 16364 public int getResolvedTextAlignment() { 16365 // If text alignment is not resolved, then resolve it 16366 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16367 resolveTextAlignment(); 16368 } 16369 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16370 } 16371 16372 /** 16373 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16374 * resolution is done. 16375 * @hide 16376 */ 16377 public void resolveTextAlignment() { 16378 // Reset any previous text alignment resolution 16379 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16380 16381 if (hasRtlSupport()) { 16382 // Set resolved text alignment flag depending on text alignment flag 16383 final int textAlignment = getTextAlignment(); 16384 switch (textAlignment) { 16385 case TEXT_ALIGNMENT_INHERIT: 16386 // Check if we can resolve the text alignment 16387 if (canResolveLayoutDirection() && mParent instanceof View) { 16388 View view = (View) mParent; 16389 16390 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16391 switch (parentResolvedTextAlignment) { 16392 case TEXT_ALIGNMENT_GRAVITY: 16393 case TEXT_ALIGNMENT_TEXT_START: 16394 case TEXT_ALIGNMENT_TEXT_END: 16395 case TEXT_ALIGNMENT_CENTER: 16396 case TEXT_ALIGNMENT_VIEW_START: 16397 case TEXT_ALIGNMENT_VIEW_END: 16398 // Resolved text alignment is the same as the parent resolved 16399 // text alignment 16400 mPrivateFlags2 |= 16401 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16402 break; 16403 default: 16404 // Use default resolved text alignment 16405 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16406 } 16407 } 16408 else { 16409 // We cannot do the resolution if there is no parent so use the default 16410 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16411 } 16412 break; 16413 case TEXT_ALIGNMENT_GRAVITY: 16414 case TEXT_ALIGNMENT_TEXT_START: 16415 case TEXT_ALIGNMENT_TEXT_END: 16416 case TEXT_ALIGNMENT_CENTER: 16417 case TEXT_ALIGNMENT_VIEW_START: 16418 case TEXT_ALIGNMENT_VIEW_END: 16419 // Resolved text alignment is the same as text alignment 16420 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16421 break; 16422 default: 16423 // Use default resolved text alignment 16424 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16425 } 16426 } else { 16427 // Use default resolved text alignment 16428 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16429 } 16430 16431 // Set the resolved 16432 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16433 onResolvedTextAlignmentChanged(); 16434 } 16435 16436 /** 16437 * Check if text alignment resolution can be done. 16438 * 16439 * @return true if text alignment resolution can be done otherwise return false. 16440 * @hide 16441 */ 16442 public boolean canResolveTextAlignment() { 16443 switch (getTextAlignment()) { 16444 case TEXT_DIRECTION_INHERIT: 16445 return (mParent != null); 16446 default: 16447 return true; 16448 } 16449 } 16450 16451 /** 16452 * Called when text alignment has been resolved. Subclasses that care about text alignment 16453 * resolution should override this method. 16454 * 16455 * The default implementation does nothing. 16456 * @hide 16457 */ 16458 public void onResolvedTextAlignmentChanged() { 16459 } 16460 16461 /** 16462 * Reset resolved text alignment. Text alignment can be resolved with a call to 16463 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16464 * reset is done. 16465 * @hide 16466 */ 16467 public void resetResolvedTextAlignment() { 16468 // Reset any previous text alignment resolution 16469 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16470 onResolvedTextAlignmentReset(); 16471 } 16472 16473 /** 16474 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16475 * override this method and do a reset of the text alignment of their children. The default 16476 * implementation does nothing. 16477 * @hide 16478 */ 16479 public void onResolvedTextAlignmentReset() { 16480 } 16481 16482 // 16483 // Properties 16484 // 16485 /** 16486 * A Property wrapper around the <code>alpha</code> functionality handled by the 16487 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16488 */ 16489 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16490 @Override 16491 public void setValue(View object, float value) { 16492 object.setAlpha(value); 16493 } 16494 16495 @Override 16496 public Float get(View object) { 16497 return object.getAlpha(); 16498 } 16499 }; 16500 16501 /** 16502 * A Property wrapper around the <code>translationX</code> functionality handled by the 16503 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16504 */ 16505 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16506 @Override 16507 public void setValue(View object, float value) { 16508 object.setTranslationX(value); 16509 } 16510 16511 @Override 16512 public Float get(View object) { 16513 return object.getTranslationX(); 16514 } 16515 }; 16516 16517 /** 16518 * A Property wrapper around the <code>translationY</code> functionality handled by the 16519 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16520 */ 16521 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16522 @Override 16523 public void setValue(View object, float value) { 16524 object.setTranslationY(value); 16525 } 16526 16527 @Override 16528 public Float get(View object) { 16529 return object.getTranslationY(); 16530 } 16531 }; 16532 16533 /** 16534 * A Property wrapper around the <code>x</code> functionality handled by the 16535 * {@link View#setX(float)} and {@link View#getX()} methods. 16536 */ 16537 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16538 @Override 16539 public void setValue(View object, float value) { 16540 object.setX(value); 16541 } 16542 16543 @Override 16544 public Float get(View object) { 16545 return object.getX(); 16546 } 16547 }; 16548 16549 /** 16550 * A Property wrapper around the <code>y</code> functionality handled by the 16551 * {@link View#setY(float)} and {@link View#getY()} methods. 16552 */ 16553 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16554 @Override 16555 public void setValue(View object, float value) { 16556 object.setY(value); 16557 } 16558 16559 @Override 16560 public Float get(View object) { 16561 return object.getY(); 16562 } 16563 }; 16564 16565 /** 16566 * A Property wrapper around the <code>rotation</code> functionality handled by the 16567 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16568 */ 16569 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16570 @Override 16571 public void setValue(View object, float value) { 16572 object.setRotation(value); 16573 } 16574 16575 @Override 16576 public Float get(View object) { 16577 return object.getRotation(); 16578 } 16579 }; 16580 16581 /** 16582 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16583 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16584 */ 16585 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16586 @Override 16587 public void setValue(View object, float value) { 16588 object.setRotationX(value); 16589 } 16590 16591 @Override 16592 public Float get(View object) { 16593 return object.getRotationX(); 16594 } 16595 }; 16596 16597 /** 16598 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16599 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16600 */ 16601 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16602 @Override 16603 public void setValue(View object, float value) { 16604 object.setRotationY(value); 16605 } 16606 16607 @Override 16608 public Float get(View object) { 16609 return object.getRotationY(); 16610 } 16611 }; 16612 16613 /** 16614 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16615 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16616 */ 16617 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16618 @Override 16619 public void setValue(View object, float value) { 16620 object.setScaleX(value); 16621 } 16622 16623 @Override 16624 public Float get(View object) { 16625 return object.getScaleX(); 16626 } 16627 }; 16628 16629 /** 16630 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16631 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16632 */ 16633 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16634 @Override 16635 public void setValue(View object, float value) { 16636 object.setScaleY(value); 16637 } 16638 16639 @Override 16640 public Float get(View object) { 16641 return object.getScaleY(); 16642 } 16643 }; 16644 16645 /** 16646 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16647 * Each MeasureSpec represents a requirement for either the width or the height. 16648 * A MeasureSpec is comprised of a size and a mode. There are three possible 16649 * modes: 16650 * <dl> 16651 * <dt>UNSPECIFIED</dt> 16652 * <dd> 16653 * The parent has not imposed any constraint on the child. It can be whatever size 16654 * it wants. 16655 * </dd> 16656 * 16657 * <dt>EXACTLY</dt> 16658 * <dd> 16659 * The parent has determined an exact size for the child. The child is going to be 16660 * given those bounds regardless of how big it wants to be. 16661 * </dd> 16662 * 16663 * <dt>AT_MOST</dt> 16664 * <dd> 16665 * The child can be as large as it wants up to the specified size. 16666 * </dd> 16667 * </dl> 16668 * 16669 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16670 * is provided to pack and unpack the <size, mode> tuple into the int. 16671 */ 16672 public static class MeasureSpec { 16673 private static final int MODE_SHIFT = 30; 16674 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16675 16676 /** 16677 * Measure specification mode: The parent has not imposed any constraint 16678 * on the child. It can be whatever size it wants. 16679 */ 16680 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16681 16682 /** 16683 * Measure specification mode: The parent has determined an exact size 16684 * for the child. The child is going to be given those bounds regardless 16685 * of how big it wants to be. 16686 */ 16687 public static final int EXACTLY = 1 << MODE_SHIFT; 16688 16689 /** 16690 * Measure specification mode: The child can be as large as it wants up 16691 * to the specified size. 16692 */ 16693 public static final int AT_MOST = 2 << MODE_SHIFT; 16694 16695 /** 16696 * Creates a measure specification based on the supplied size and mode. 16697 * 16698 * The mode must always be one of the following: 16699 * <ul> 16700 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16701 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16702 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16703 * </ul> 16704 * 16705 * @param size the size of the measure specification 16706 * @param mode the mode of the measure specification 16707 * @return the measure specification based on size and mode 16708 */ 16709 public static int makeMeasureSpec(int size, int mode) { 16710 return size + mode; 16711 } 16712 16713 /** 16714 * Extracts the mode from the supplied measure specification. 16715 * 16716 * @param measureSpec the measure specification to extract the mode from 16717 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16718 * {@link android.view.View.MeasureSpec#AT_MOST} or 16719 * {@link android.view.View.MeasureSpec#EXACTLY} 16720 */ 16721 public static int getMode(int measureSpec) { 16722 return (measureSpec & MODE_MASK); 16723 } 16724 16725 /** 16726 * Extracts the size from the supplied measure specification. 16727 * 16728 * @param measureSpec the measure specification to extract the size from 16729 * @return the size in pixels defined in the supplied measure specification 16730 */ 16731 public static int getSize(int measureSpec) { 16732 return (measureSpec & ~MODE_MASK); 16733 } 16734 16735 /** 16736 * Returns a String representation of the specified measure 16737 * specification. 16738 * 16739 * @param measureSpec the measure specification to convert to a String 16740 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16741 */ 16742 public static String toString(int measureSpec) { 16743 int mode = getMode(measureSpec); 16744 int size = getSize(measureSpec); 16745 16746 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16747 16748 if (mode == UNSPECIFIED) 16749 sb.append("UNSPECIFIED "); 16750 else if (mode == EXACTLY) 16751 sb.append("EXACTLY "); 16752 else if (mode == AT_MOST) 16753 sb.append("AT_MOST "); 16754 else 16755 sb.append(mode).append(" "); 16756 16757 sb.append(size); 16758 return sb.toString(); 16759 } 16760 } 16761 16762 class CheckForLongPress implements Runnable { 16763 16764 private int mOriginalWindowAttachCount; 16765 16766 public void run() { 16767 if (isPressed() && (mParent != null) 16768 && mOriginalWindowAttachCount == mWindowAttachCount) { 16769 if (performLongClick()) { 16770 mHasPerformedLongPress = true; 16771 } 16772 } 16773 } 16774 16775 public void rememberWindowAttachCount() { 16776 mOriginalWindowAttachCount = mWindowAttachCount; 16777 } 16778 } 16779 16780 private final class CheckForTap implements Runnable { 16781 public void run() { 16782 mPrivateFlags &= ~PREPRESSED; 16783 setPressed(true); 16784 checkForLongClick(ViewConfiguration.getTapTimeout()); 16785 } 16786 } 16787 16788 private final class PerformClick implements Runnable { 16789 public void run() { 16790 performClick(); 16791 } 16792 } 16793 16794 /** @hide */ 16795 public void hackTurnOffWindowResizeAnim(boolean off) { 16796 mAttachInfo.mTurnOffWindowResizeAnim = off; 16797 } 16798 16799 /** 16800 * This method returns a ViewPropertyAnimator object, which can be used to animate 16801 * specific properties on this View. 16802 * 16803 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16804 */ 16805 public ViewPropertyAnimator animate() { 16806 if (mAnimator == null) { 16807 mAnimator = new ViewPropertyAnimator(this); 16808 } 16809 return mAnimator; 16810 } 16811 16812 /** 16813 * Interface definition for a callback to be invoked when a key event is 16814 * dispatched to this view. The callback will be invoked before the key 16815 * event is given to the view. 16816 */ 16817 public interface OnKeyListener { 16818 /** 16819 * Called when a key is dispatched to a view. This allows listeners to 16820 * get a chance to respond before the target view. 16821 * 16822 * @param v The view the key has been dispatched to. 16823 * @param keyCode The code for the physical key that was pressed 16824 * @param event The KeyEvent object containing full information about 16825 * the event. 16826 * @return True if the listener has consumed the event, false otherwise. 16827 */ 16828 boolean onKey(View v, int keyCode, KeyEvent event); 16829 } 16830 16831 /** 16832 * Interface definition for a callback to be invoked when a touch event is 16833 * dispatched to this view. The callback will be invoked before the touch 16834 * event is given to the view. 16835 */ 16836 public interface OnTouchListener { 16837 /** 16838 * Called when a touch event is dispatched to a view. This allows listeners to 16839 * get a chance to respond before the target view. 16840 * 16841 * @param v The view the touch event has been dispatched to. 16842 * @param event The MotionEvent object containing full information about 16843 * the event. 16844 * @return True if the listener has consumed the event, false otherwise. 16845 */ 16846 boolean onTouch(View v, MotionEvent event); 16847 } 16848 16849 /** 16850 * Interface definition for a callback to be invoked when a hover event is 16851 * dispatched to this view. The callback will be invoked before the hover 16852 * event is given to the view. 16853 */ 16854 public interface OnHoverListener { 16855 /** 16856 * Called when a hover event is dispatched to a view. This allows listeners to 16857 * get a chance to respond before the target view. 16858 * 16859 * @param v The view the hover event has been dispatched to. 16860 * @param event The MotionEvent object containing full information about 16861 * the event. 16862 * @return True if the listener has consumed the event, false otherwise. 16863 */ 16864 boolean onHover(View v, MotionEvent event); 16865 } 16866 16867 /** 16868 * Interface definition for a callback to be invoked when a generic motion event is 16869 * dispatched to this view. The callback will be invoked before the generic motion 16870 * event is given to the view. 16871 */ 16872 public interface OnGenericMotionListener { 16873 /** 16874 * Called when a generic motion event is dispatched to a view. This allows listeners to 16875 * get a chance to respond before the target view. 16876 * 16877 * @param v The view the generic motion event has been dispatched to. 16878 * @param event The MotionEvent object containing full information about 16879 * the event. 16880 * @return True if the listener has consumed the event, false otherwise. 16881 */ 16882 boolean onGenericMotion(View v, MotionEvent event); 16883 } 16884 16885 /** 16886 * Interface definition for a callback to be invoked when a view has been clicked and held. 16887 */ 16888 public interface OnLongClickListener { 16889 /** 16890 * Called when a view has been clicked and held. 16891 * 16892 * @param v The view that was clicked and held. 16893 * 16894 * @return true if the callback consumed the long click, false otherwise. 16895 */ 16896 boolean onLongClick(View v); 16897 } 16898 16899 /** 16900 * Interface definition for a callback to be invoked when a drag is being dispatched 16901 * to this view. The callback will be invoked before the hosting view's own 16902 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16903 * onDrag(event) behavior, it should return 'false' from this callback. 16904 * 16905 * <div class="special reference"> 16906 * <h3>Developer Guides</h3> 16907 * <p>For a guide to implementing drag and drop features, read the 16908 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16909 * </div> 16910 */ 16911 public interface OnDragListener { 16912 /** 16913 * Called when a drag event is dispatched to a view. This allows listeners 16914 * to get a chance to override base View behavior. 16915 * 16916 * @param v The View that received the drag event. 16917 * @param event The {@link android.view.DragEvent} object for the drag event. 16918 * @return {@code true} if the drag event was handled successfully, or {@code false} 16919 * if the drag event was not handled. Note that {@code false} will trigger the View 16920 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16921 */ 16922 boolean onDrag(View v, DragEvent event); 16923 } 16924 16925 /** 16926 * Interface definition for a callback to be invoked when the focus state of 16927 * a view changed. 16928 */ 16929 public interface OnFocusChangeListener { 16930 /** 16931 * Called when the focus state of a view has changed. 16932 * 16933 * @param v The view whose state has changed. 16934 * @param hasFocus The new focus state of v. 16935 */ 16936 void onFocusChange(View v, boolean hasFocus); 16937 } 16938 16939 /** 16940 * Interface definition for a callback to be invoked when a view is clicked. 16941 */ 16942 public interface OnClickListener { 16943 /** 16944 * Called when a view has been clicked. 16945 * 16946 * @param v The view that was clicked. 16947 */ 16948 void onClick(View v); 16949 } 16950 16951 /** 16952 * Interface definition for a callback to be invoked when the context menu 16953 * for this view is being built. 16954 */ 16955 public interface OnCreateContextMenuListener { 16956 /** 16957 * Called when the context menu for this view is being built. It is not 16958 * safe to hold onto the menu after this method returns. 16959 * 16960 * @param menu The context menu that is being built 16961 * @param v The view for which the context menu is being built 16962 * @param menuInfo Extra information about the item for which the 16963 * context menu should be shown. This information will vary 16964 * depending on the class of v. 16965 */ 16966 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16967 } 16968 16969 /** 16970 * Interface definition for a callback to be invoked when the status bar changes 16971 * visibility. This reports <strong>global</strong> changes to the system UI 16972 * state, not what the application is requesting. 16973 * 16974 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16975 */ 16976 public interface OnSystemUiVisibilityChangeListener { 16977 /** 16978 * Called when the status bar changes visibility because of a call to 16979 * {@link View#setSystemUiVisibility(int)}. 16980 * 16981 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16982 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16983 * This tells you the <strong>global</strong> state of these UI visibility 16984 * flags, not what your app is currently applying. 16985 */ 16986 public void onSystemUiVisibilityChange(int visibility); 16987 } 16988 16989 /** 16990 * Interface definition for a callback to be invoked when this view is attached 16991 * or detached from its window. 16992 */ 16993 public interface OnAttachStateChangeListener { 16994 /** 16995 * Called when the view is attached to a window. 16996 * @param v The view that was attached 16997 */ 16998 public void onViewAttachedToWindow(View v); 16999 /** 17000 * Called when the view is detached from a window. 17001 * @param v The view that was detached 17002 */ 17003 public void onViewDetachedFromWindow(View v); 17004 } 17005 17006 private final class UnsetPressedState implements Runnable { 17007 public void run() { 17008 setPressed(false); 17009 } 17010 } 17011 17012 /** 17013 * Base class for derived classes that want to save and restore their own 17014 * state in {@link android.view.View#onSaveInstanceState()}. 17015 */ 17016 public static class BaseSavedState extends AbsSavedState { 17017 /** 17018 * Constructor used when reading from a parcel. Reads the state of the superclass. 17019 * 17020 * @param source 17021 */ 17022 public BaseSavedState(Parcel source) { 17023 super(source); 17024 } 17025 17026 /** 17027 * Constructor called by derived classes when creating their SavedState objects 17028 * 17029 * @param superState The state of the superclass of this view 17030 */ 17031 public BaseSavedState(Parcelable superState) { 17032 super(superState); 17033 } 17034 17035 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17036 new Parcelable.Creator<BaseSavedState>() { 17037 public BaseSavedState createFromParcel(Parcel in) { 17038 return new BaseSavedState(in); 17039 } 17040 17041 public BaseSavedState[] newArray(int size) { 17042 return new BaseSavedState[size]; 17043 } 17044 }; 17045 } 17046 17047 /** 17048 * A set of information given to a view when it is attached to its parent 17049 * window. 17050 */ 17051 static class AttachInfo { 17052 interface Callbacks { 17053 void playSoundEffect(int effectId); 17054 boolean performHapticFeedback(int effectId, boolean always); 17055 } 17056 17057 /** 17058 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17059 * to a Handler. This class contains the target (View) to invalidate and 17060 * the coordinates of the dirty rectangle. 17061 * 17062 * For performance purposes, this class also implements a pool of up to 17063 * POOL_LIMIT objects that get reused. This reduces memory allocations 17064 * whenever possible. 17065 */ 17066 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17067 private static final int POOL_LIMIT = 10; 17068 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17069 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17070 public InvalidateInfo newInstance() { 17071 return new InvalidateInfo(); 17072 } 17073 17074 public void onAcquired(InvalidateInfo element) { 17075 } 17076 17077 public void onReleased(InvalidateInfo element) { 17078 element.target = null; 17079 } 17080 }, POOL_LIMIT) 17081 ); 17082 17083 private InvalidateInfo mNext; 17084 private boolean mIsPooled; 17085 17086 View target; 17087 17088 int left; 17089 int top; 17090 int right; 17091 int bottom; 17092 17093 public void setNextPoolable(InvalidateInfo element) { 17094 mNext = element; 17095 } 17096 17097 public InvalidateInfo getNextPoolable() { 17098 return mNext; 17099 } 17100 17101 static InvalidateInfo acquire() { 17102 return sPool.acquire(); 17103 } 17104 17105 void release() { 17106 sPool.release(this); 17107 } 17108 17109 public boolean isPooled() { 17110 return mIsPooled; 17111 } 17112 17113 public void setPooled(boolean isPooled) { 17114 mIsPooled = isPooled; 17115 } 17116 } 17117 17118 final IWindowSession mSession; 17119 17120 final IWindow mWindow; 17121 17122 final IBinder mWindowToken; 17123 17124 final Callbacks mRootCallbacks; 17125 17126 HardwareCanvas mHardwareCanvas; 17127 17128 /** 17129 * The top view of the hierarchy. 17130 */ 17131 View mRootView; 17132 17133 IBinder mPanelParentWindowToken; 17134 Surface mSurface; 17135 17136 boolean mHardwareAccelerated; 17137 boolean mHardwareAccelerationRequested; 17138 HardwareRenderer mHardwareRenderer; 17139 17140 boolean mScreenOn; 17141 17142 /** 17143 * Scale factor used by the compatibility mode 17144 */ 17145 float mApplicationScale; 17146 17147 /** 17148 * Indicates whether the application is in compatibility mode 17149 */ 17150 boolean mScalingRequired; 17151 17152 /** 17153 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17154 */ 17155 boolean mTurnOffWindowResizeAnim; 17156 17157 /** 17158 * Left position of this view's window 17159 */ 17160 int mWindowLeft; 17161 17162 /** 17163 * Top position of this view's window 17164 */ 17165 int mWindowTop; 17166 17167 /** 17168 * Indicates whether views need to use 32-bit drawing caches 17169 */ 17170 boolean mUse32BitDrawingCache; 17171 17172 /** 17173 * For windows that are full-screen but using insets to layout inside 17174 * of the screen decorations, these are the current insets for the 17175 * content of the window. 17176 */ 17177 final Rect mContentInsets = new Rect(); 17178 17179 /** 17180 * For windows that are full-screen but using insets to layout inside 17181 * of the screen decorations, these are the current insets for the 17182 * actual visible parts of the window. 17183 */ 17184 final Rect mVisibleInsets = new Rect(); 17185 17186 /** 17187 * The internal insets given by this window. This value is 17188 * supplied by the client (through 17189 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17190 * be given to the window manager when changed to be used in laying 17191 * out windows behind it. 17192 */ 17193 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17194 = new ViewTreeObserver.InternalInsetsInfo(); 17195 17196 /** 17197 * All views in the window's hierarchy that serve as scroll containers, 17198 * used to determine if the window can be resized or must be panned 17199 * to adjust for a soft input area. 17200 */ 17201 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17202 17203 final KeyEvent.DispatcherState mKeyDispatchState 17204 = new KeyEvent.DispatcherState(); 17205 17206 /** 17207 * Indicates whether the view's window currently has the focus. 17208 */ 17209 boolean mHasWindowFocus; 17210 17211 /** 17212 * The current visibility of the window. 17213 */ 17214 int mWindowVisibility; 17215 17216 /** 17217 * Indicates the time at which drawing started to occur. 17218 */ 17219 long mDrawingTime; 17220 17221 /** 17222 * Indicates whether or not ignoring the DIRTY_MASK flags. 17223 */ 17224 boolean mIgnoreDirtyState; 17225 17226 /** 17227 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17228 * to avoid clearing that flag prematurely. 17229 */ 17230 boolean mSetIgnoreDirtyState = false; 17231 17232 /** 17233 * Indicates whether the view's window is currently in touch mode. 17234 */ 17235 boolean mInTouchMode; 17236 17237 /** 17238 * Indicates that ViewAncestor should trigger a global layout change 17239 * the next time it performs a traversal 17240 */ 17241 boolean mRecomputeGlobalAttributes; 17242 17243 /** 17244 * Always report new attributes at next traversal. 17245 */ 17246 boolean mForceReportNewAttributes; 17247 17248 /** 17249 * Set during a traveral if any views want to keep the screen on. 17250 */ 17251 boolean mKeepScreenOn; 17252 17253 /** 17254 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17255 */ 17256 int mSystemUiVisibility; 17257 17258 /** 17259 * Hack to force certain system UI visibility flags to be cleared. 17260 */ 17261 int mDisabledSystemUiVisibility; 17262 17263 /** 17264 * Last global system UI visibility reported by the window manager. 17265 */ 17266 int mGlobalSystemUiVisibility; 17267 17268 /** 17269 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17270 * attached. 17271 */ 17272 boolean mHasSystemUiListeners; 17273 17274 /** 17275 * Set if the visibility of any views has changed. 17276 */ 17277 boolean mViewVisibilityChanged; 17278 17279 /** 17280 * Set to true if a view has been scrolled. 17281 */ 17282 boolean mViewScrollChanged; 17283 17284 /** 17285 * Global to the view hierarchy used as a temporary for dealing with 17286 * x/y points in the transparent region computations. 17287 */ 17288 final int[] mTransparentLocation = new int[2]; 17289 17290 /** 17291 * Global to the view hierarchy used as a temporary for dealing with 17292 * x/y points in the ViewGroup.invalidateChild implementation. 17293 */ 17294 final int[] mInvalidateChildLocation = new int[2]; 17295 17296 17297 /** 17298 * Global to the view hierarchy used as a temporary for dealing with 17299 * x/y location when view is transformed. 17300 */ 17301 final float[] mTmpTransformLocation = new float[2]; 17302 17303 /** 17304 * The view tree observer used to dispatch global events like 17305 * layout, pre-draw, touch mode change, etc. 17306 */ 17307 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17308 17309 /** 17310 * A Canvas used by the view hierarchy to perform bitmap caching. 17311 */ 17312 Canvas mCanvas; 17313 17314 /** 17315 * The view root impl. 17316 */ 17317 final ViewRootImpl mViewRootImpl; 17318 17319 /** 17320 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17321 * handler can be used to pump events in the UI events queue. 17322 */ 17323 final Handler mHandler; 17324 17325 /** 17326 * Temporary for use in computing invalidate rectangles while 17327 * calling up the hierarchy. 17328 */ 17329 final Rect mTmpInvalRect = new Rect(); 17330 17331 /** 17332 * Temporary for use in computing hit areas with transformed views 17333 */ 17334 final RectF mTmpTransformRect = new RectF(); 17335 17336 /** 17337 * Temporary list for use in collecting focusable descendents of a view. 17338 */ 17339 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17340 17341 /** 17342 * The id of the window for accessibility purposes. 17343 */ 17344 int mAccessibilityWindowId = View.NO_ID; 17345 17346 /** 17347 * Whether to ingore not exposed for accessibility Views when 17348 * reporting the view tree to accessibility services. 17349 */ 17350 boolean mIncludeNotImportantViews; 17351 17352 /** 17353 * The drawable for highlighting accessibility focus. 17354 */ 17355 Drawable mAccessibilityFocusDrawable; 17356 17357 /** 17358 * Show where the margins, bounds and layout bounds are for each view. 17359 */ 17360 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17361 17362 /** 17363 * Point used to compute visible regions. 17364 */ 17365 final Point mPoint = new Point(); 17366 17367 /** 17368 * Creates a new set of attachment information with the specified 17369 * events handler and thread. 17370 * 17371 * @param handler the events handler the view must use 17372 */ 17373 AttachInfo(IWindowSession session, IWindow window, 17374 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17375 mSession = session; 17376 mWindow = window; 17377 mWindowToken = window.asBinder(); 17378 mViewRootImpl = viewRootImpl; 17379 mHandler = handler; 17380 mRootCallbacks = effectPlayer; 17381 } 17382 } 17383 17384 /** 17385 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17386 * is supported. This avoids keeping too many unused fields in most 17387 * instances of View.</p> 17388 */ 17389 private static class ScrollabilityCache implements Runnable { 17390 17391 /** 17392 * Scrollbars are not visible 17393 */ 17394 public static final int OFF = 0; 17395 17396 /** 17397 * Scrollbars are visible 17398 */ 17399 public static final int ON = 1; 17400 17401 /** 17402 * Scrollbars are fading away 17403 */ 17404 public static final int FADING = 2; 17405 17406 public boolean fadeScrollBars; 17407 17408 public int fadingEdgeLength; 17409 public int scrollBarDefaultDelayBeforeFade; 17410 public int scrollBarFadeDuration; 17411 17412 public int scrollBarSize; 17413 public ScrollBarDrawable scrollBar; 17414 public float[] interpolatorValues; 17415 public View host; 17416 17417 public final Paint paint; 17418 public final Matrix matrix; 17419 public Shader shader; 17420 17421 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17422 17423 private static final float[] OPAQUE = { 255 }; 17424 private static final float[] TRANSPARENT = { 0.0f }; 17425 17426 /** 17427 * When fading should start. This time moves into the future every time 17428 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17429 */ 17430 public long fadeStartTime; 17431 17432 17433 /** 17434 * The current state of the scrollbars: ON, OFF, or FADING 17435 */ 17436 public int state = OFF; 17437 17438 private int mLastColor; 17439 17440 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17441 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17442 scrollBarSize = configuration.getScaledScrollBarSize(); 17443 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17444 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17445 17446 paint = new Paint(); 17447 matrix = new Matrix(); 17448 // use use a height of 1, and then wack the matrix each time we 17449 // actually use it. 17450 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17451 17452 paint.setShader(shader); 17453 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17454 this.host = host; 17455 } 17456 17457 public void setFadeColor(int color) { 17458 if (color != 0 && color != mLastColor) { 17459 mLastColor = color; 17460 color |= 0xFF000000; 17461 17462 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17463 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17464 17465 paint.setShader(shader); 17466 // Restore the default transfer mode (src_over) 17467 paint.setXfermode(null); 17468 } 17469 } 17470 17471 public void run() { 17472 long now = AnimationUtils.currentAnimationTimeMillis(); 17473 if (now >= fadeStartTime) { 17474 17475 // the animation fades the scrollbars out by changing 17476 // the opacity (alpha) from fully opaque to fully 17477 // transparent 17478 int nextFrame = (int) now; 17479 int framesCount = 0; 17480 17481 Interpolator interpolator = scrollBarInterpolator; 17482 17483 // Start opaque 17484 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17485 17486 // End transparent 17487 nextFrame += scrollBarFadeDuration; 17488 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17489 17490 state = FADING; 17491 17492 // Kick off the fade animation 17493 host.invalidate(true); 17494 } 17495 } 17496 } 17497 17498 /** 17499 * Resuable callback for sending 17500 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17501 */ 17502 private class SendViewScrolledAccessibilityEvent implements Runnable { 17503 public volatile boolean mIsPending; 17504 17505 public void run() { 17506 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17507 mIsPending = false; 17508 } 17509 } 17510 17511 /** 17512 * <p> 17513 * This class represents a delegate that can be registered in a {@link View} 17514 * to enhance accessibility support via composition rather via inheritance. 17515 * It is specifically targeted to widget developers that extend basic View 17516 * classes i.e. classes in package android.view, that would like their 17517 * applications to be backwards compatible. 17518 * </p> 17519 * <div class="special reference"> 17520 * <h3>Developer Guides</h3> 17521 * <p>For more information about making applications accessible, read the 17522 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17523 * developer guide.</p> 17524 * </div> 17525 * <p> 17526 * A scenario in which a developer would like to use an accessibility delegate 17527 * is overriding a method introduced in a later API version then the minimal API 17528 * version supported by the application. For example, the method 17529 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17530 * in API version 4 when the accessibility APIs were first introduced. If a 17531 * developer would like his application to run on API version 4 devices (assuming 17532 * all other APIs used by the application are version 4 or lower) and take advantage 17533 * of this method, instead of overriding the method which would break the application's 17534 * backwards compatibility, he can override the corresponding method in this 17535 * delegate and register the delegate in the target View if the API version of 17536 * the system is high enough i.e. the API version is same or higher to the API 17537 * version that introduced 17538 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17539 * </p> 17540 * <p> 17541 * Here is an example implementation: 17542 * </p> 17543 * <code><pre><p> 17544 * if (Build.VERSION.SDK_INT >= 14) { 17545 * // If the API version is equal of higher than the version in 17546 * // which onInitializeAccessibilityNodeInfo was introduced we 17547 * // register a delegate with a customized implementation. 17548 * View view = findViewById(R.id.view_id); 17549 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17550 * public void onInitializeAccessibilityNodeInfo(View host, 17551 * AccessibilityNodeInfo info) { 17552 * // Let the default implementation populate the info. 17553 * super.onInitializeAccessibilityNodeInfo(host, info); 17554 * // Set some other information. 17555 * info.setEnabled(host.isEnabled()); 17556 * } 17557 * }); 17558 * } 17559 * </code></pre></p> 17560 * <p> 17561 * This delegate contains methods that correspond to the accessibility methods 17562 * in View. If a delegate has been specified the implementation in View hands 17563 * off handling to the corresponding method in this delegate. The default 17564 * implementation the delegate methods behaves exactly as the corresponding 17565 * method in View for the case of no accessibility delegate been set. Hence, 17566 * to customize the behavior of a View method, clients can override only the 17567 * corresponding delegate method without altering the behavior of the rest 17568 * accessibility related methods of the host view. 17569 * </p> 17570 */ 17571 public static class AccessibilityDelegate { 17572 17573 /** 17574 * Sends an accessibility event of the given type. If accessibility is not 17575 * enabled this method has no effect. 17576 * <p> 17577 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17578 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17579 * been set. 17580 * </p> 17581 * 17582 * @param host The View hosting the delegate. 17583 * @param eventType The type of the event to send. 17584 * 17585 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17586 */ 17587 public void sendAccessibilityEvent(View host, int eventType) { 17588 host.sendAccessibilityEventInternal(eventType); 17589 } 17590 17591 /** 17592 * Performs the specified accessibility action on the view. For 17593 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17594 * <p> 17595 * The default implementation behaves as 17596 * {@link View#performAccessibilityAction(int, Bundle) 17597 * View#performAccessibilityAction(int, Bundle)} for the case of 17598 * no accessibility delegate been set. 17599 * </p> 17600 * 17601 * @param action The action to perform. 17602 * @return Whether the action was performed. 17603 * 17604 * @see View#performAccessibilityAction(int, Bundle) 17605 * View#performAccessibilityAction(int, Bundle) 17606 */ 17607 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17608 return host.performAccessibilityActionInternal(action, args); 17609 } 17610 17611 /** 17612 * Sends an accessibility event. This method behaves exactly as 17613 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17614 * empty {@link AccessibilityEvent} and does not perform a check whether 17615 * accessibility is enabled. 17616 * <p> 17617 * The default implementation behaves as 17618 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17619 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17620 * the case of no accessibility delegate been set. 17621 * </p> 17622 * 17623 * @param host The View hosting the delegate. 17624 * @param event The event to send. 17625 * 17626 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17627 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17628 */ 17629 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17630 host.sendAccessibilityEventUncheckedInternal(event); 17631 } 17632 17633 /** 17634 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17635 * to its children for adding their text content to the event. 17636 * <p> 17637 * The default implementation behaves as 17638 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17639 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17640 * the case of no accessibility delegate been set. 17641 * </p> 17642 * 17643 * @param host The View hosting the delegate. 17644 * @param event The event. 17645 * @return True if the event population was completed. 17646 * 17647 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17648 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17649 */ 17650 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17651 return host.dispatchPopulateAccessibilityEventInternal(event); 17652 } 17653 17654 /** 17655 * Gives a chance to the host View to populate the accessibility event with its 17656 * text content. 17657 * <p> 17658 * The default implementation behaves as 17659 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17660 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17661 * the case of no accessibility delegate been set. 17662 * </p> 17663 * 17664 * @param host The View hosting the delegate. 17665 * @param event The accessibility event which to populate. 17666 * 17667 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17668 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17669 */ 17670 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17671 host.onPopulateAccessibilityEventInternal(event); 17672 } 17673 17674 /** 17675 * Initializes an {@link AccessibilityEvent} with information about the 17676 * the host View which is the event source. 17677 * <p> 17678 * The default implementation behaves as 17679 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17680 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17681 * the case of no accessibility delegate been set. 17682 * </p> 17683 * 17684 * @param host The View hosting the delegate. 17685 * @param event The event to initialize. 17686 * 17687 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17688 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17689 */ 17690 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17691 host.onInitializeAccessibilityEventInternal(event); 17692 } 17693 17694 /** 17695 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17696 * <p> 17697 * The default implementation behaves as 17698 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17699 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17700 * the case of no accessibility delegate been set. 17701 * </p> 17702 * 17703 * @param host The View hosting the delegate. 17704 * @param info The instance to initialize. 17705 * 17706 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17707 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17708 */ 17709 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17710 host.onInitializeAccessibilityNodeInfoInternal(info); 17711 } 17712 17713 /** 17714 * Called when a child of the host View has requested sending an 17715 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17716 * to augment the event. 17717 * <p> 17718 * The default implementation behaves as 17719 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17720 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17721 * the case of no accessibility delegate been set. 17722 * </p> 17723 * 17724 * @param host The View hosting the delegate. 17725 * @param child The child which requests sending the event. 17726 * @param event The event to be sent. 17727 * @return True if the event should be sent 17728 * 17729 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17730 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17731 */ 17732 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17733 AccessibilityEvent event) { 17734 return host.onRequestSendAccessibilityEventInternal(child, event); 17735 } 17736 17737 /** 17738 * Gets the provider for managing a virtual view hierarchy rooted at this View 17739 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17740 * that explore the window content. 17741 * <p> 17742 * The default implementation behaves as 17743 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17744 * the case of no accessibility delegate been set. 17745 * </p> 17746 * 17747 * @return The provider. 17748 * 17749 * @see AccessibilityNodeProvider 17750 */ 17751 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17752 return null; 17753 } 17754 } 17755} 17756