View.java revision 5b5cc4d5361c1817938d2db58ad40aab528b3ac3
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93 94/** 95 * <p> 96 * This class represents the basic building block for user interface components. A View 97 * occupies a rectangular area on the screen and is responsible for drawing and 98 * event handling. View is the base class for <em>widgets</em>, which are 99 * used to create interactive UI components (buttons, text fields, etc.). The 100 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 101 * are invisible containers that hold other Views (or other ViewGroups) and define 102 * their layout properties. 103 * </p> 104 * 105 * <div class="special reference"> 106 * <h3>Developer Guides</h3> 107 * <p>For information about using this class to develop your application's user interface, 108 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, {@link #getPaddingRight()}, 348 * {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Properties"></a> 543 * <h3>Properties</h3> 544 * <p> 545 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 546 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 547 * available both in the {@link Property} form as well as in similarly-named setter/getter 548 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 549 * be used to set persistent state associated with these rendering-related properties on the view. 550 * The properties and methods can also be used in conjunction with 551 * {@link android.animation.Animator Animator}-based animations, described more in the 552 * <a href="#Animation">Animation</a> section. 553 * </p> 554 * 555 * <a name="Animation"></a> 556 * <h3>Animation</h3> 557 * <p> 558 * Starting with Android 3.0, the preferred way of animating views is to use the 559 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 560 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 561 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 562 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 563 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 564 * makes animating these View properties particularly easy and efficient. 565 * </p> 566 * <p> 567 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 568 * You can attach an {@link Animation} object to a view using 569 * {@link #setAnimation(Animation)} or 570 * {@link #startAnimation(Animation)}. The animation can alter the scale, 571 * rotation, translation and alpha of a view over time. If the animation is 572 * attached to a view that has children, the animation will affect the entire 573 * subtree rooted by that node. When an animation is started, the framework will 574 * take care of redrawing the appropriate views until the animation completes. 575 * </p> 576 * 577 * <a name="Security"></a> 578 * <h3>Security</h3> 579 * <p> 580 * Sometimes it is essential that an application be able to verify that an action 581 * is being performed with the full knowledge and consent of the user, such as 582 * granting a permission request, making a purchase or clicking on an advertisement. 583 * Unfortunately, a malicious application could try to spoof the user into 584 * performing these actions, unaware, by concealing the intended purpose of the view. 585 * As a remedy, the framework offers a touch filtering mechanism that can be used to 586 * improve the security of views that provide access to sensitive functionality. 587 * </p><p> 588 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 589 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 590 * will discard touches that are received whenever the view's window is obscured by 591 * another visible window. As a result, the view will not receive touches whenever a 592 * toast, dialog or other window appears above the view's window. 593 * </p><p> 594 * For more fine-grained control over security, consider overriding the 595 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 596 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 597 * </p> 598 * 599 * @attr ref android.R.styleable#View_alpha 600 * @attr ref android.R.styleable#View_background 601 * @attr ref android.R.styleable#View_clickable 602 * @attr ref android.R.styleable#View_contentDescription 603 * @attr ref android.R.styleable#View_drawingCacheQuality 604 * @attr ref android.R.styleable#View_duplicateParentState 605 * @attr ref android.R.styleable#View_id 606 * @attr ref android.R.styleable#View_requiresFadingEdge 607 * @attr ref android.R.styleable#View_fadeScrollbars 608 * @attr ref android.R.styleable#View_fadingEdgeLength 609 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 610 * @attr ref android.R.styleable#View_fitsSystemWindows 611 * @attr ref android.R.styleable#View_isScrollContainer 612 * @attr ref android.R.styleable#View_focusable 613 * @attr ref android.R.styleable#View_focusableInTouchMode 614 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 615 * @attr ref android.R.styleable#View_keepScreenOn 616 * @attr ref android.R.styleable#View_layerType 617 * @attr ref android.R.styleable#View_longClickable 618 * @attr ref android.R.styleable#View_minHeight 619 * @attr ref android.R.styleable#View_minWidth 620 * @attr ref android.R.styleable#View_nextFocusDown 621 * @attr ref android.R.styleable#View_nextFocusLeft 622 * @attr ref android.R.styleable#View_nextFocusRight 623 * @attr ref android.R.styleable#View_nextFocusUp 624 * @attr ref android.R.styleable#View_onClick 625 * @attr ref android.R.styleable#View_padding 626 * @attr ref android.R.styleable#View_paddingBottom 627 * @attr ref android.R.styleable#View_paddingLeft 628 * @attr ref android.R.styleable#View_paddingRight 629 * @attr ref android.R.styleable#View_paddingTop 630 * @attr ref android.R.styleable#View_saveEnabled 631 * @attr ref android.R.styleable#View_rotation 632 * @attr ref android.R.styleable#View_rotationX 633 * @attr ref android.R.styleable#View_rotationY 634 * @attr ref android.R.styleable#View_scaleX 635 * @attr ref android.R.styleable#View_scaleY 636 * @attr ref android.R.styleable#View_scrollX 637 * @attr ref android.R.styleable#View_scrollY 638 * @attr ref android.R.styleable#View_scrollbarSize 639 * @attr ref android.R.styleable#View_scrollbarStyle 640 * @attr ref android.R.styleable#View_scrollbars 641 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 642 * @attr ref android.R.styleable#View_scrollbarFadeDuration 643 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 644 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 645 * @attr ref android.R.styleable#View_scrollbarThumbVertical 646 * @attr ref android.R.styleable#View_scrollbarTrackVertical 647 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 648 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 649 * @attr ref android.R.styleable#View_soundEffectsEnabled 650 * @attr ref android.R.styleable#View_tag 651 * @attr ref android.R.styleable#View_transformPivotX 652 * @attr ref android.R.styleable#View_transformPivotY 653 * @attr ref android.R.styleable#View_translationX 654 * @attr ref android.R.styleable#View_translationY 655 * @attr ref android.R.styleable#View_visibility 656 * 657 * @see android.view.ViewGroup 658 */ 659public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 660 AccessibilityEventSource { 661 private static final boolean DBG = false; 662 663 /** 664 * The logging tag used by this class with android.util.Log. 665 */ 666 protected static final String VIEW_LOG_TAG = "View"; 667 668 /** 669 * When set to true, apps will draw debugging information about their layouts. 670 * 671 * @hide 672 */ 673 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 674 675 /** 676 * Used to mark a View that has no ID. 677 */ 678 public static final int NO_ID = -1; 679 680 /** 681 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 682 * calling setFlags. 683 */ 684 private static final int NOT_FOCUSABLE = 0x00000000; 685 686 /** 687 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 688 * setFlags. 689 */ 690 private static final int FOCUSABLE = 0x00000001; 691 692 /** 693 * Mask for use with setFlags indicating bits used for focus. 694 */ 695 private static final int FOCUSABLE_MASK = 0x00000001; 696 697 /** 698 * This view will adjust its padding to fit sytem windows (e.g. status bar) 699 */ 700 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 701 702 /** 703 * This view is visible. 704 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 705 * android:visibility}. 706 */ 707 public static final int VISIBLE = 0x00000000; 708 709 /** 710 * This view is invisible, but it still takes up space for layout purposes. 711 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 712 * android:visibility}. 713 */ 714 public static final int INVISIBLE = 0x00000004; 715 716 /** 717 * This view is invisible, and it doesn't take any space for layout 718 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int GONE = 0x00000008; 722 723 /** 724 * Mask for use with setFlags indicating bits used for visibility. 725 * {@hide} 726 */ 727 static final int VISIBILITY_MASK = 0x0000000C; 728 729 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 730 731 /** 732 * This view is enabled. Interpretation varies by subclass. 733 * Use with ENABLED_MASK when calling setFlags. 734 * {@hide} 735 */ 736 static final int ENABLED = 0x00000000; 737 738 /** 739 * This view is disabled. Interpretation varies by subclass. 740 * Use with ENABLED_MASK when calling setFlags. 741 * {@hide} 742 */ 743 static final int DISABLED = 0x00000020; 744 745 /** 746 * Mask for use with setFlags indicating bits used for indicating whether 747 * this view is enabled 748 * {@hide} 749 */ 750 static final int ENABLED_MASK = 0x00000020; 751 752 /** 753 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 754 * called and further optimizations will be performed. It is okay to have 755 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 756 * {@hide} 757 */ 758 static final int WILL_NOT_DRAW = 0x00000080; 759 760 /** 761 * Mask for use with setFlags indicating bits used for indicating whether 762 * this view is will draw 763 * {@hide} 764 */ 765 static final int DRAW_MASK = 0x00000080; 766 767 /** 768 * <p>This view doesn't show scrollbars.</p> 769 * {@hide} 770 */ 771 static final int SCROLLBARS_NONE = 0x00000000; 772 773 /** 774 * <p>This view shows horizontal scrollbars.</p> 775 * {@hide} 776 */ 777 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 778 779 /** 780 * <p>This view shows vertical scrollbars.</p> 781 * {@hide} 782 */ 783 static final int SCROLLBARS_VERTICAL = 0x00000200; 784 785 /** 786 * <p>Mask for use with setFlags indicating bits used for indicating which 787 * scrollbars are enabled.</p> 788 * {@hide} 789 */ 790 static final int SCROLLBARS_MASK = 0x00000300; 791 792 /** 793 * Indicates that the view should filter touches when its window is obscured. 794 * Refer to the class comments for more information about this security feature. 795 * {@hide} 796 */ 797 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 798 799 /** 800 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 801 * that they are optional and should be skipped if the window has 802 * requested system UI flags that ignore those insets for layout. 803 */ 804 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 805 806 /** 807 * <p>This view doesn't show fading edges.</p> 808 * {@hide} 809 */ 810 static final int FADING_EDGE_NONE = 0x00000000; 811 812 /** 813 * <p>This view shows horizontal fading edges.</p> 814 * {@hide} 815 */ 816 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 817 818 /** 819 * <p>This view shows vertical fading edges.</p> 820 * {@hide} 821 */ 822 static final int FADING_EDGE_VERTICAL = 0x00002000; 823 824 /** 825 * <p>Mask for use with setFlags indicating bits used for indicating which 826 * fading edges are enabled.</p> 827 * {@hide} 828 */ 829 static final int FADING_EDGE_MASK = 0x00003000; 830 831 /** 832 * <p>Indicates this view can be clicked. When clickable, a View reacts 833 * to clicks by notifying the OnClickListener.<p> 834 * {@hide} 835 */ 836 static final int CLICKABLE = 0x00004000; 837 838 /** 839 * <p>Indicates this view is caching its drawing into a bitmap.</p> 840 * {@hide} 841 */ 842 static final int DRAWING_CACHE_ENABLED = 0x00008000; 843 844 /** 845 * <p>Indicates that no icicle should be saved for this view.<p> 846 * {@hide} 847 */ 848 static final int SAVE_DISABLED = 0x000010000; 849 850 /** 851 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 852 * property.</p> 853 * {@hide} 854 */ 855 static final int SAVE_DISABLED_MASK = 0x000010000; 856 857 /** 858 * <p>Indicates that no drawing cache should ever be created for this view.<p> 859 * {@hide} 860 */ 861 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 862 863 /** 864 * <p>Indicates this view can take / keep focus when int touch mode.</p> 865 * {@hide} 866 */ 867 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 868 869 /** 870 * <p>Enables low quality mode for the drawing cache.</p> 871 */ 872 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 873 874 /** 875 * <p>Enables high quality mode for the drawing cache.</p> 876 */ 877 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 878 879 /** 880 * <p>Enables automatic quality mode for the drawing cache.</p> 881 */ 882 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 883 884 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 885 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 886 }; 887 888 /** 889 * <p>Mask for use with setFlags indicating bits used for the cache 890 * quality property.</p> 891 * {@hide} 892 */ 893 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 894 895 /** 896 * <p> 897 * Indicates this view can be long clicked. When long clickable, a View 898 * reacts to long clicks by notifying the OnLongClickListener or showing a 899 * context menu. 900 * </p> 901 * {@hide} 902 */ 903 static final int LONG_CLICKABLE = 0x00200000; 904 905 /** 906 * <p>Indicates that this view gets its drawable states from its direct parent 907 * and ignores its original internal states.</p> 908 * 909 * @hide 910 */ 911 static final int DUPLICATE_PARENT_STATE = 0x00400000; 912 913 /** 914 * The scrollbar style to display the scrollbars inside the content area, 915 * without increasing the padding. The scrollbars will be overlaid with 916 * translucency on the view's content. 917 */ 918 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 919 920 /** 921 * The scrollbar style to display the scrollbars inside the padded area, 922 * increasing the padding of the view. The scrollbars will not overlap the 923 * content area of the view. 924 */ 925 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 926 927 /** 928 * The scrollbar style to display the scrollbars at the edge of the view, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency. 931 */ 932 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 933 934 /** 935 * The scrollbar style to display the scrollbars at the edge of the view, 936 * increasing the padding of the view. The scrollbars will only overlap the 937 * background, if any. 938 */ 939 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 940 941 /** 942 * Mask to check if the scrollbar style is overlay or inset. 943 * {@hide} 944 */ 945 static final int SCROLLBARS_INSET_MASK = 0x01000000; 946 947 /** 948 * Mask to check if the scrollbar style is inside or outside. 949 * {@hide} 950 */ 951 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 952 953 /** 954 * Mask for scrollbar style. 955 * {@hide} 956 */ 957 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 958 959 /** 960 * View flag indicating that the screen should remain on while the 961 * window containing this view is visible to the user. This effectively 962 * takes care of automatically setting the WindowManager's 963 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 964 */ 965 public static final int KEEP_SCREEN_ON = 0x04000000; 966 967 /** 968 * View flag indicating whether this view should have sound effects enabled 969 * for events such as clicking and touching. 970 */ 971 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 972 973 /** 974 * View flag indicating whether this view should have haptic feedback 975 * enabled for events such as long presses. 976 */ 977 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 978 979 /** 980 * <p>Indicates that the view hierarchy should stop saving state when 981 * it reaches this view. If state saving is initiated immediately at 982 * the view, it will be allowed. 983 * {@hide} 984 */ 985 static final int PARENT_SAVE_DISABLED = 0x20000000; 986 987 /** 988 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 989 * {@hide} 990 */ 991 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 992 993 /** 994 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 995 * should add all focusable Views regardless if they are focusable in touch mode. 996 */ 997 public static final int FOCUSABLES_ALL = 0x00000000; 998 999 /** 1000 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1001 * should add only Views focusable in touch mode. 1002 */ 1003 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1004 1005 /** 1006 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1007 * should add only accessibility focusable Views. 1008 * 1009 * @hide 1010 */ 1011 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1012 1013 /** 1014 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1015 * item. 1016 */ 1017 public static final int FOCUS_BACKWARD = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_FORWARD = 0x00000002; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the left. 1027 */ 1028 public static final int FOCUS_LEFT = 0x00000011; 1029 1030 /** 1031 * Use with {@link #focusSearch(int)}. Move focus up. 1032 */ 1033 public static final int FOCUS_UP = 0x00000021; 1034 1035 /** 1036 * Use with {@link #focusSearch(int)}. Move focus to the right. 1037 */ 1038 public static final int FOCUS_RIGHT = 0x00000042; 1039 1040 /** 1041 * Use with {@link #focusSearch(int)}. Move focus down. 1042 */ 1043 public static final int FOCUS_DOWN = 0x00000082; 1044 1045 // Accessibility focus directions. 1046 1047 /** 1048 * The accessibility focus which is the current user position when 1049 * interacting with the accessibility framework. 1050 */ 1051 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1052 1053 /** 1054 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1055 */ 1056 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1057 1058 /** 1059 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1060 */ 1061 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1062 1063 /** 1064 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1065 */ 1066 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1067 1068 /** 1069 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1070 */ 1071 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1072 1073 /** 1074 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1075 */ 1076 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1077 1078 /** 1079 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1080 */ 1081 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1082 1083 /** 1084 * Bits of {@link #getMeasuredWidthAndState()} and 1085 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1086 */ 1087 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1088 1089 /** 1090 * Bits of {@link #getMeasuredWidthAndState()} and 1091 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1092 */ 1093 public static final int MEASURED_STATE_MASK = 0xff000000; 1094 1095 /** 1096 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1097 * for functions that combine both width and height into a single int, 1098 * such as {@link #getMeasuredState()} and the childState argument of 1099 * {@link #resolveSizeAndState(int, int, int)}. 1100 */ 1101 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1102 1103 /** 1104 * Bit of {@link #getMeasuredWidthAndState()} and 1105 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1106 * is smaller that the space the view would like to have. 1107 */ 1108 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1109 1110 /** 1111 * Base View state sets 1112 */ 1113 // Singles 1114 /** 1115 * Indicates the view has no states set. States are used with 1116 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1117 * view depending on its state. 1118 * 1119 * @see android.graphics.drawable.Drawable 1120 * @see #getDrawableState() 1121 */ 1122 protected static final int[] EMPTY_STATE_SET; 1123 /** 1124 * Indicates the view is enabled. States are used with 1125 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1126 * view depending on its state. 1127 * 1128 * @see android.graphics.drawable.Drawable 1129 * @see #getDrawableState() 1130 */ 1131 protected static final int[] ENABLED_STATE_SET; 1132 /** 1133 * Indicates the view is focused. States are used with 1134 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1135 * view depending on its state. 1136 * 1137 * @see android.graphics.drawable.Drawable 1138 * @see #getDrawableState() 1139 */ 1140 protected static final int[] FOCUSED_STATE_SET; 1141 /** 1142 * Indicates the view is selected. States are used with 1143 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1144 * view depending on its state. 1145 * 1146 * @see android.graphics.drawable.Drawable 1147 * @see #getDrawableState() 1148 */ 1149 protected static final int[] SELECTED_STATE_SET; 1150 /** 1151 * Indicates the view is pressed. States are used with 1152 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1153 * view depending on its state. 1154 * 1155 * @see android.graphics.drawable.Drawable 1156 * @see #getDrawableState() 1157 * @hide 1158 */ 1159 protected static final int[] PRESSED_STATE_SET; 1160 /** 1161 * Indicates the view's window has focus. States are used with 1162 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1163 * view depending on its state. 1164 * 1165 * @see android.graphics.drawable.Drawable 1166 * @see #getDrawableState() 1167 */ 1168 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1169 // Doubles 1170 /** 1171 * Indicates the view is enabled and has the focus. 1172 * 1173 * @see #ENABLED_STATE_SET 1174 * @see #FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1177 /** 1178 * Indicates the view is enabled and selected. 1179 * 1180 * @see #ENABLED_STATE_SET 1181 * @see #SELECTED_STATE_SET 1182 */ 1183 protected static final int[] ENABLED_SELECTED_STATE_SET; 1184 /** 1185 * Indicates the view is enabled and that its window has focus. 1186 * 1187 * @see #ENABLED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is focused and selected. 1193 * 1194 * @see #FOCUSED_STATE_SET 1195 * @see #SELECTED_STATE_SET 1196 */ 1197 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1198 /** 1199 * Indicates the view has the focus and that its window has the focus. 1200 * 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is selected and that its window has the focus. 1207 * 1208 * @see #SELECTED_STATE_SET 1209 * @see #WINDOW_FOCUSED_STATE_SET 1210 */ 1211 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1212 // Triples 1213 /** 1214 * Indicates the view is enabled, focused and selected. 1215 * 1216 * @see #ENABLED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 */ 1220 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1221 /** 1222 * Indicates the view is enabled, focused and its window has the focus. 1223 * 1224 * @see #ENABLED_STATE_SET 1225 * @see #FOCUSED_STATE_SET 1226 * @see #WINDOW_FOCUSED_STATE_SET 1227 */ 1228 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1229 /** 1230 * Indicates the view is enabled, selected and its window has the focus. 1231 * 1232 * @see #ENABLED_STATE_SET 1233 * @see #SELECTED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is focused, selected and its window has the focus. 1239 * 1240 * @see #FOCUSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is enabled, focused, selected and its window 1247 * has the focus. 1248 * 1249 * @see #ENABLED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed and its window has the focus. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #WINDOW_FOCUSED_STATE_SET 1260 */ 1261 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1262 /** 1263 * Indicates the view is pressed and selected. 1264 * 1265 * @see #PRESSED_STATE_SET 1266 * @see #SELECTED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and focused. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #FOCUSED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, focused and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #FOCUSED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, focused and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #SELECTED_STATE_SET 1297 * @see #FOCUSED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, focused, selected and its window has the focus. 1302 * 1303 * @see #PRESSED_STATE_SET 1304 * @see #FOCUSED_STATE_SET 1305 * @see #SELECTED_STATE_SET 1306 * @see #WINDOW_FOCUSED_STATE_SET 1307 */ 1308 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1309 /** 1310 * Indicates the view is pressed and enabled. 1311 * 1312 * @see #PRESSED_STATE_SET 1313 * @see #ENABLED_STATE_SET 1314 */ 1315 protected static final int[] PRESSED_ENABLED_STATE_SET; 1316 /** 1317 * Indicates the view is pressed, enabled and its window has the focus. 1318 * 1319 * @see #PRESSED_STATE_SET 1320 * @see #ENABLED_STATE_SET 1321 * @see #WINDOW_FOCUSED_STATE_SET 1322 */ 1323 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1324 /** 1325 * Indicates the view is pressed, enabled and selected. 1326 * 1327 * @see #PRESSED_STATE_SET 1328 * @see #ENABLED_STATE_SET 1329 * @see #SELECTED_STATE_SET 1330 */ 1331 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1332 /** 1333 * Indicates the view is pressed, enabled, selected and its window has the 1334 * focus. 1335 * 1336 * @see #PRESSED_STATE_SET 1337 * @see #ENABLED_STATE_SET 1338 * @see #SELECTED_STATE_SET 1339 * @see #WINDOW_FOCUSED_STATE_SET 1340 */ 1341 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1342 /** 1343 * Indicates the view is pressed, enabled and focused. 1344 * 1345 * @see #PRESSED_STATE_SET 1346 * @see #ENABLED_STATE_SET 1347 * @see #FOCUSED_STATE_SET 1348 */ 1349 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1350 /** 1351 * Indicates the view is pressed, enabled, focused and its window has the 1352 * focus. 1353 * 1354 * @see #PRESSED_STATE_SET 1355 * @see #ENABLED_STATE_SET 1356 * @see #FOCUSED_STATE_SET 1357 * @see #WINDOW_FOCUSED_STATE_SET 1358 */ 1359 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1360 /** 1361 * Indicates the view is pressed, enabled, focused and selected. 1362 * 1363 * @see #PRESSED_STATE_SET 1364 * @see #ENABLED_STATE_SET 1365 * @see #SELECTED_STATE_SET 1366 * @see #FOCUSED_STATE_SET 1367 */ 1368 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1369 /** 1370 * Indicates the view is pressed, enabled, focused, selected and its window 1371 * has the focus. 1372 * 1373 * @see #PRESSED_STATE_SET 1374 * @see #ENABLED_STATE_SET 1375 * @see #SELECTED_STATE_SET 1376 * @see #FOCUSED_STATE_SET 1377 * @see #WINDOW_FOCUSED_STATE_SET 1378 */ 1379 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1380 1381 /** 1382 * The order here is very important to {@link #getDrawableState()} 1383 */ 1384 private static final int[][] VIEW_STATE_SETS; 1385 1386 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1387 static final int VIEW_STATE_SELECTED = 1 << 1; 1388 static final int VIEW_STATE_FOCUSED = 1 << 2; 1389 static final int VIEW_STATE_ENABLED = 1 << 3; 1390 static final int VIEW_STATE_PRESSED = 1 << 4; 1391 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1392 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1393 static final int VIEW_STATE_HOVERED = 1 << 7; 1394 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1395 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1396 1397 static final int[] VIEW_STATE_IDS = new int[] { 1398 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1399 R.attr.state_selected, VIEW_STATE_SELECTED, 1400 R.attr.state_focused, VIEW_STATE_FOCUSED, 1401 R.attr.state_enabled, VIEW_STATE_ENABLED, 1402 R.attr.state_pressed, VIEW_STATE_PRESSED, 1403 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1404 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1405 R.attr.state_hovered, VIEW_STATE_HOVERED, 1406 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1407 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1408 }; 1409 1410 static { 1411 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1412 throw new IllegalStateException( 1413 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1414 } 1415 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1416 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1417 int viewState = R.styleable.ViewDrawableStates[i]; 1418 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1419 if (VIEW_STATE_IDS[j] == viewState) { 1420 orderedIds[i * 2] = viewState; 1421 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1422 } 1423 } 1424 } 1425 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1426 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1427 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1428 int numBits = Integer.bitCount(i); 1429 int[] set = new int[numBits]; 1430 int pos = 0; 1431 for (int j = 0; j < orderedIds.length; j += 2) { 1432 if ((i & orderedIds[j+1]) != 0) { 1433 set[pos++] = orderedIds[j]; 1434 } 1435 } 1436 VIEW_STATE_SETS[i] = set; 1437 } 1438 1439 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1440 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1441 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1442 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1444 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1445 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1447 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1449 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1451 | VIEW_STATE_FOCUSED]; 1452 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1453 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1455 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1457 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_ENABLED]; 1460 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1462 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1464 | VIEW_STATE_ENABLED]; 1465 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1467 | VIEW_STATE_ENABLED]; 1468 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1471 1472 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1473 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1475 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1477 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1479 | VIEW_STATE_PRESSED]; 1480 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1482 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1483 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1484 | VIEW_STATE_PRESSED]; 1485 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1486 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1487 | VIEW_STATE_PRESSED]; 1488 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1489 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1490 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1491 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1492 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1493 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1494 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1495 | VIEW_STATE_PRESSED]; 1496 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1497 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1498 | VIEW_STATE_PRESSED]; 1499 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1500 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1501 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1502 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1503 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1504 | VIEW_STATE_PRESSED]; 1505 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1506 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1507 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1508 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1509 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1510 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1511 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1512 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1513 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1514 | VIEW_STATE_PRESSED]; 1515 } 1516 1517 /** 1518 * Accessibility event types that are dispatched for text population. 1519 */ 1520 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1521 AccessibilityEvent.TYPE_VIEW_CLICKED 1522 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1523 | AccessibilityEvent.TYPE_VIEW_SELECTED 1524 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1525 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1526 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1527 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1528 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1529 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1531 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1532 1533 /** 1534 * Temporary Rect currently for use in setBackground(). This will probably 1535 * be extended in the future to hold our own class with more than just 1536 * a Rect. :) 1537 */ 1538 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1539 1540 /** 1541 * Map used to store views' tags. 1542 */ 1543 private SparseArray<Object> mKeyedTags; 1544 1545 /** 1546 * The next available accessiiblity id. 1547 */ 1548 private static int sNextAccessibilityViewId; 1549 1550 /** 1551 * The animation currently associated with this view. 1552 * @hide 1553 */ 1554 protected Animation mCurrentAnimation = null; 1555 1556 /** 1557 * Width as measured during measure pass. 1558 * {@hide} 1559 */ 1560 @ViewDebug.ExportedProperty(category = "measurement") 1561 int mMeasuredWidth; 1562 1563 /** 1564 * Height as measured during measure pass. 1565 * {@hide} 1566 */ 1567 @ViewDebug.ExportedProperty(category = "measurement") 1568 int mMeasuredHeight; 1569 1570 /** 1571 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1572 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1573 * its display list. This flag, used only when hw accelerated, allows us to clear the 1574 * flag while retaining this information until it's needed (at getDisplayList() time and 1575 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1576 * 1577 * {@hide} 1578 */ 1579 boolean mRecreateDisplayList = false; 1580 1581 /** 1582 * The view's identifier. 1583 * {@hide} 1584 * 1585 * @see #setId(int) 1586 * @see #getId() 1587 */ 1588 @ViewDebug.ExportedProperty(resolveId = true) 1589 int mID = NO_ID; 1590 1591 /** 1592 * The stable ID of this view for accessibility purposes. 1593 */ 1594 int mAccessibilityViewId = NO_ID; 1595 1596 /** 1597 * @hide 1598 */ 1599 private int mAccessibilityCursorPosition = -1; 1600 1601 /** 1602 * The view's tag. 1603 * {@hide} 1604 * 1605 * @see #setTag(Object) 1606 * @see #getTag() 1607 */ 1608 protected Object mTag; 1609 1610 // for mPrivateFlags: 1611 /** {@hide} */ 1612 static final int WANTS_FOCUS = 0x00000001; 1613 /** {@hide} */ 1614 static final int FOCUSED = 0x00000002; 1615 /** {@hide} */ 1616 static final int SELECTED = 0x00000004; 1617 /** {@hide} */ 1618 static final int IS_ROOT_NAMESPACE = 0x00000008; 1619 /** {@hide} */ 1620 static final int HAS_BOUNDS = 0x00000010; 1621 /** {@hide} */ 1622 static final int DRAWN = 0x00000020; 1623 /** 1624 * When this flag is set, this view is running an animation on behalf of its 1625 * children and should therefore not cancel invalidate requests, even if they 1626 * lie outside of this view's bounds. 1627 * 1628 * {@hide} 1629 */ 1630 static final int DRAW_ANIMATION = 0x00000040; 1631 /** {@hide} */ 1632 static final int SKIP_DRAW = 0x00000080; 1633 /** {@hide} */ 1634 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1635 /** {@hide} */ 1636 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1637 /** {@hide} */ 1638 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1639 /** {@hide} */ 1640 static final int MEASURED_DIMENSION_SET = 0x00000800; 1641 /** {@hide} */ 1642 static final int FORCE_LAYOUT = 0x00001000; 1643 /** {@hide} */ 1644 static final int LAYOUT_REQUIRED = 0x00002000; 1645 1646 private static final int PRESSED = 0x00004000; 1647 1648 /** {@hide} */ 1649 static final int DRAWING_CACHE_VALID = 0x00008000; 1650 /** 1651 * Flag used to indicate that this view should be drawn once more (and only once 1652 * more) after its animation has completed. 1653 * {@hide} 1654 */ 1655 static final int ANIMATION_STARTED = 0x00010000; 1656 1657 private static final int SAVE_STATE_CALLED = 0x00020000; 1658 1659 /** 1660 * Indicates that the View returned true when onSetAlpha() was called and that 1661 * the alpha must be restored. 1662 * {@hide} 1663 */ 1664 static final int ALPHA_SET = 0x00040000; 1665 1666 /** 1667 * Set by {@link #setScrollContainer(boolean)}. 1668 */ 1669 static final int SCROLL_CONTAINER = 0x00080000; 1670 1671 /** 1672 * Set by {@link #setScrollContainer(boolean)}. 1673 */ 1674 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1675 1676 /** 1677 * View flag indicating whether this view was invalidated (fully or partially.) 1678 * 1679 * @hide 1680 */ 1681 static final int DIRTY = 0x00200000; 1682 1683 /** 1684 * View flag indicating whether this view was invalidated by an opaque 1685 * invalidate request. 1686 * 1687 * @hide 1688 */ 1689 static final int DIRTY_OPAQUE = 0x00400000; 1690 1691 /** 1692 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1693 * 1694 * @hide 1695 */ 1696 static final int DIRTY_MASK = 0x00600000; 1697 1698 /** 1699 * Indicates whether the background is opaque. 1700 * 1701 * @hide 1702 */ 1703 static final int OPAQUE_BACKGROUND = 0x00800000; 1704 1705 /** 1706 * Indicates whether the scrollbars are opaque. 1707 * 1708 * @hide 1709 */ 1710 static final int OPAQUE_SCROLLBARS = 0x01000000; 1711 1712 /** 1713 * Indicates whether the view is opaque. 1714 * 1715 * @hide 1716 */ 1717 static final int OPAQUE_MASK = 0x01800000; 1718 1719 /** 1720 * Indicates a prepressed state; 1721 * the short time between ACTION_DOWN and recognizing 1722 * a 'real' press. Prepressed is used to recognize quick taps 1723 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1724 * 1725 * @hide 1726 */ 1727 private static final int PREPRESSED = 0x02000000; 1728 1729 /** 1730 * Indicates whether the view is temporarily detached. 1731 * 1732 * @hide 1733 */ 1734 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1735 1736 /** 1737 * Indicates that we should awaken scroll bars once attached 1738 * 1739 * @hide 1740 */ 1741 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1742 1743 /** 1744 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1745 * @hide 1746 */ 1747 private static final int HOVERED = 0x10000000; 1748 1749 /** 1750 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1751 * for transform operations 1752 * 1753 * @hide 1754 */ 1755 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1756 1757 /** {@hide} */ 1758 static final int ACTIVATED = 0x40000000; 1759 1760 /** 1761 * Indicates that this view was specifically invalidated, not just dirtied because some 1762 * child view was invalidated. The flag is used to determine when we need to recreate 1763 * a view's display list (as opposed to just returning a reference to its existing 1764 * display list). 1765 * 1766 * @hide 1767 */ 1768 static final int INVALIDATED = 0x80000000; 1769 1770 /* Masks for mPrivateFlags2 */ 1771 1772 /** 1773 * Indicates that this view has reported that it can accept the current drag's content. 1774 * Cleared when the drag operation concludes. 1775 * @hide 1776 */ 1777 static final int DRAG_CAN_ACCEPT = 0x00000001; 1778 1779 /** 1780 * Indicates that this view is currently directly under the drag location in a 1781 * drag-and-drop operation involving content that it can accept. Cleared when 1782 * the drag exits the view, or when the drag operation concludes. 1783 * @hide 1784 */ 1785 static final int DRAG_HOVERED = 0x00000002; 1786 1787 /** 1788 * Horizontal layout direction of this view is from Left to Right. 1789 * Use with {@link #setLayoutDirection}. 1790 * @hide 1791 */ 1792 public static final int LAYOUT_DIRECTION_LTR = 0; 1793 1794 /** 1795 * Horizontal layout direction of this view is from Right to Left. 1796 * Use with {@link #setLayoutDirection}. 1797 * @hide 1798 */ 1799 public static final int LAYOUT_DIRECTION_RTL = 1; 1800 1801 /** 1802 * Horizontal layout direction of this view is inherited from its parent. 1803 * Use with {@link #setLayoutDirection}. 1804 * @hide 1805 */ 1806 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1807 1808 /** 1809 * Horizontal layout direction of this view is from deduced from the default language 1810 * script for the locale. Use with {@link #setLayoutDirection}. 1811 * @hide 1812 */ 1813 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /** 1828 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1829 * right-to-left direction. 1830 * @hide 1831 */ 1832 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1833 1834 /** 1835 * Indicates whether the view horizontal layout direction has been resolved. 1836 * @hide 1837 */ 1838 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1842 * @hide 1843 */ 1844 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /* 1847 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1848 * flag value. 1849 * @hide 1850 */ 1851 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1852 LAYOUT_DIRECTION_LTR, 1853 LAYOUT_DIRECTION_RTL, 1854 LAYOUT_DIRECTION_INHERIT, 1855 LAYOUT_DIRECTION_LOCALE 1856 }; 1857 1858 /** 1859 * Default horizontal layout direction. 1860 * @hide 1861 */ 1862 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1863 1864 /** 1865 * Indicates that the view is tracking some sort of transient state 1866 * that the app should not need to be aware of, but that the framework 1867 * should take special care to preserve. 1868 * 1869 * @hide 1870 */ 1871 static final int HAS_TRANSIENT_STATE = 0x00000100; 1872 1873 1874 /** 1875 * Text direction is inherited thru {@link ViewGroup} 1876 * @hide 1877 */ 1878 public static final int TEXT_DIRECTION_INHERIT = 0; 1879 1880 /** 1881 * Text direction is using "first strong algorithm". The first strong directional character 1882 * determines the paragraph direction. If there is no strong directional character, the 1883 * paragraph direction is the view's resolved layout direction. 1884 * @hide 1885 */ 1886 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1887 1888 /** 1889 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1890 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1891 * If there are neither, the paragraph direction is the view's resolved layout direction. 1892 * @hide 1893 */ 1894 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1895 1896 /** 1897 * Text direction is forced to LTR. 1898 * @hide 1899 */ 1900 public static final int TEXT_DIRECTION_LTR = 3; 1901 1902 /** 1903 * Text direction is forced to RTL. 1904 * @hide 1905 */ 1906 public static final int TEXT_DIRECTION_RTL = 4; 1907 1908 /** 1909 * Text direction is coming from the system Locale. 1910 * @hide 1911 */ 1912 public static final int TEXT_DIRECTION_LOCALE = 5; 1913 1914 /** 1915 * Default text direction is inherited 1916 * @hide 1917 */ 1918 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1919 1920 /** 1921 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1922 * @hide 1923 */ 1924 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1925 1926 /** 1927 * Mask for use with private flags indicating bits used for text direction. 1928 * @hide 1929 */ 1930 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1931 1932 /** 1933 * Array of text direction flags for mapping attribute "textDirection" to correct 1934 * flag value. 1935 * @hide 1936 */ 1937 private static final int[] TEXT_DIRECTION_FLAGS = { 1938 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1939 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1940 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1941 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1942 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1943 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1944 }; 1945 1946 /** 1947 * Indicates whether the view text direction has been resolved. 1948 * @hide 1949 */ 1950 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1951 1952 /** 1953 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1954 * @hide 1955 */ 1956 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1957 1958 /** 1959 * Mask for use with private flags indicating bits used for resolved text direction. 1960 * @hide 1961 */ 1962 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /** 1965 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1966 * @hide 1967 */ 1968 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1969 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1970 1971 /* 1972 * Default text alignment. The text alignment of this View is inherited from its parent. 1973 * Use with {@link #setTextAlignment(int)} 1974 * @hide 1975 */ 1976 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1977 1978 /** 1979 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1980 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1981 * 1982 * Use with {@link #setTextAlignment(int)} 1983 * @hide 1984 */ 1985 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1986 1987 /** 1988 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1989 * 1990 * Use with {@link #setTextAlignment(int)} 1991 * @hide 1992 */ 1993 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1994 1995 /** 1996 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1997 * 1998 * Use with {@link #setTextAlignment(int)} 1999 * @hide 2000 */ 2001 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2002 2003 /** 2004 * Center the paragraph, e.g. ALIGN_CENTER. 2005 * 2006 * Use with {@link #setTextAlignment(int)} 2007 * @hide 2008 */ 2009 public static final int TEXT_ALIGNMENT_CENTER = 4; 2010 2011 /** 2012 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2013 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2014 * 2015 * Use with {@link #setTextAlignment(int)} 2016 * @hide 2017 */ 2018 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2019 2020 /** 2021 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2022 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2023 * 2024 * Use with {@link #setTextAlignment(int)} 2025 * @hide 2026 */ 2027 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2028 2029 /** 2030 * Default text alignment is inherited 2031 * @hide 2032 */ 2033 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2034 2035 /** 2036 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2037 * @hide 2038 */ 2039 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2040 2041 /** 2042 * Mask for use with private flags indicating bits used for text alignment. 2043 * @hide 2044 */ 2045 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2046 2047 /** 2048 * Array of text direction flags for mapping attribute "textAlignment" to correct 2049 * flag value. 2050 * @hide 2051 */ 2052 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2053 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2054 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2055 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2056 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2057 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2058 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2059 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2060 }; 2061 2062 /** 2063 * Indicates whether the view text alignment has been resolved. 2064 * @hide 2065 */ 2066 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2067 2068 /** 2069 * Bit shift to get the resolved text alignment. 2070 * @hide 2071 */ 2072 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2073 2074 /** 2075 * Mask for use with private flags indicating bits used for text alignment. 2076 * @hide 2077 */ 2078 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2079 2080 /** 2081 * Indicates whether if the view text alignment has been resolved to gravity 2082 */ 2083 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2084 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2085 2086 // Accessiblity constants for mPrivateFlags2 2087 2088 /** 2089 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2090 */ 2091 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2092 2093 /** 2094 * Automatically determine whether a view is important for accessibility. 2095 */ 2096 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2097 2098 /** 2099 * The view is important for accessibility. 2100 */ 2101 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2102 2103 /** 2104 * The view is not important for accessibility. 2105 */ 2106 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2107 2108 /** 2109 * The default whether the view is important for accessiblity. 2110 */ 2111 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2112 2113 /** 2114 * Mask for obtainig the bits which specify how to determine 2115 * whether a view is important for accessibility. 2116 */ 2117 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2118 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2119 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2120 2121 /** 2122 * Flag indicating whether a view has accessibility focus. 2123 */ 2124 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2125 2126 /** 2127 * Flag indicating whether a view state for accessibility has changed. 2128 */ 2129 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2130 2131 /** 2132 * Flag indicating that view has an animation set on it. This is used to track whether an 2133 * animation is cleared between successive frames, in order to tell the associated 2134 * DisplayList to clear its animation matrix. 2135 */ 2136 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x10000000; 2137 2138 /** 2139 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2140 * is used to check whether later changes to the view's transform should invalidate the 2141 * view to force the quickReject test to run again. 2142 */ 2143 static final int VIEW_QUICK_REJECTED = 0x20000000; 2144 2145 /* End of masks for mPrivateFlags2 */ 2146 2147 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2148 2149 /** 2150 * Always allow a user to over-scroll this view, provided it is a 2151 * view that can scroll. 2152 * 2153 * @see #getOverScrollMode() 2154 * @see #setOverScrollMode(int) 2155 */ 2156 public static final int OVER_SCROLL_ALWAYS = 0; 2157 2158 /** 2159 * Allow a user to over-scroll this view only if the content is large 2160 * enough to meaningfully scroll, provided it is a view that can scroll. 2161 * 2162 * @see #getOverScrollMode() 2163 * @see #setOverScrollMode(int) 2164 */ 2165 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2166 2167 /** 2168 * Never allow a user to over-scroll this view. 2169 * 2170 * @see #getOverScrollMode() 2171 * @see #setOverScrollMode(int) 2172 */ 2173 public static final int OVER_SCROLL_NEVER = 2; 2174 2175 /** 2176 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2177 * requested the system UI (status bar) to be visible (the default). 2178 * 2179 * @see #setSystemUiVisibility(int) 2180 */ 2181 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2182 2183 /** 2184 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2185 * system UI to enter an unobtrusive "low profile" mode. 2186 * 2187 * <p>This is for use in games, book readers, video players, or any other 2188 * "immersive" application where the usual system chrome is deemed too distracting. 2189 * 2190 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2191 * 2192 * @see #setSystemUiVisibility(int) 2193 */ 2194 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2195 2196 /** 2197 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2198 * system navigation be temporarily hidden. 2199 * 2200 * <p>This is an even less obtrusive state than that called for by 2201 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2202 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2203 * those to disappear. This is useful (in conjunction with the 2204 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2205 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2206 * window flags) for displaying content using every last pixel on the display. 2207 * 2208 * <p>There is a limitation: because navigation controls are so important, the least user 2209 * interaction will cause them to reappear immediately. When this happens, both 2210 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2211 * so that both elements reappear at the same time. 2212 * 2213 * @see #setSystemUiVisibility(int) 2214 */ 2215 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2216 2217 /** 2218 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2219 * into the normal fullscreen mode so that its content can take over the screen 2220 * while still allowing the user to interact with the application. 2221 * 2222 * <p>This has the same visual effect as 2223 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2224 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2225 * meaning that non-critical screen decorations (such as the status bar) will be 2226 * hidden while the user is in the View's window, focusing the experience on 2227 * that content. Unlike the window flag, if you are using ActionBar in 2228 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2229 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2230 * hide the action bar. 2231 * 2232 * <p>This approach to going fullscreen is best used over the window flag when 2233 * it is a transient state -- that is, the application does this at certain 2234 * points in its user interaction where it wants to allow the user to focus 2235 * on content, but not as a continuous state. For situations where the application 2236 * would like to simply stay full screen the entire time (such as a game that 2237 * wants to take over the screen), the 2238 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2239 * is usually a better approach. The state set here will be removed by the system 2240 * in various situations (such as the user moving to another application) like 2241 * the other system UI states. 2242 * 2243 * <p>When using this flag, the application should provide some easy facility 2244 * for the user to go out of it. A common example would be in an e-book 2245 * reader, where tapping on the screen brings back whatever screen and UI 2246 * decorations that had been hidden while the user was immersed in reading 2247 * the book. 2248 * 2249 * @see #setSystemUiVisibility(int) 2250 */ 2251 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2252 2253 /** 2254 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2255 * flags, we would like a stable view of the content insets given to 2256 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2257 * will always represent the worst case that the application can expect 2258 * as a continuous state. In the stock Android UI this is the space for 2259 * the system bar, nav bar, and status bar, but not more transient elements 2260 * such as an input method. 2261 * 2262 * The stable layout your UI sees is based on the system UI modes you can 2263 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2264 * then you will get a stable layout for changes of the 2265 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2266 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2267 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2268 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2269 * with a stable layout. (Note that you should avoid using 2270 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2271 * 2272 * If you have set the window flag {@ WindowManager.LayoutParams#FLAG_FULLSCREEN} 2273 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2274 * then a hidden status bar will be considered a "stable" state for purposes 2275 * here. This allows your UI to continually hide the status bar, while still 2276 * using the system UI flags to hide the action bar while still retaining 2277 * a stable layout. Note that changing the window fullscreen flag will never 2278 * provide a stable layout for a clean transition. 2279 * 2280 * <p>If you are using ActionBar in 2281 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2282 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2283 * insets it adds to those given to the application. 2284 */ 2285 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2286 2287 /** 2288 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2289 * to be layed out as if it has requested 2290 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2291 * allows it to avoid artifacts when switching in and out of that mode, at 2292 * the expense that some of its user interface may be covered by screen 2293 * decorations when they are shown. You can perform layout of your inner 2294 * UI elements to account for the navagation system UI through the 2295 * {@link #fitSystemWindows(Rect)} method. 2296 */ 2297 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2298 2299 /** 2300 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2301 * to be layed out as if it has requested 2302 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2303 * allows it to avoid artifacts when switching in and out of that mode, at 2304 * the expense that some of its user interface may be covered by screen 2305 * decorations when they are shown. You can perform layout of your inner 2306 * UI elements to account for non-fullscreen system UI through the 2307 * {@link #fitSystemWindows(Rect)} method. 2308 */ 2309 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2310 2311 /** 2312 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2313 */ 2314 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2315 2316 /** 2317 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2318 */ 2319 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2320 2321 /** 2322 * @hide 2323 * 2324 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2325 * out of the public fields to keep the undefined bits out of the developer's way. 2326 * 2327 * Flag to make the status bar not expandable. Unless you also 2328 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2329 */ 2330 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2331 2332 /** 2333 * @hide 2334 * 2335 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2336 * out of the public fields to keep the undefined bits out of the developer's way. 2337 * 2338 * Flag to hide notification icons and scrolling ticker text. 2339 */ 2340 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2341 2342 /** 2343 * @hide 2344 * 2345 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2346 * out of the public fields to keep the undefined bits out of the developer's way. 2347 * 2348 * Flag to disable incoming notification alerts. This will not block 2349 * icons, but it will block sound, vibrating and other visual or aural notifications. 2350 */ 2351 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2352 2353 /** 2354 * @hide 2355 * 2356 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2357 * out of the public fields to keep the undefined bits out of the developer's way. 2358 * 2359 * Flag to hide only the scrolling ticker. Note that 2360 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2361 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2362 */ 2363 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2364 2365 /** 2366 * @hide 2367 * 2368 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2369 * out of the public fields to keep the undefined bits out of the developer's way. 2370 * 2371 * Flag to hide the center system info area. 2372 */ 2373 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2374 2375 /** 2376 * @hide 2377 * 2378 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2379 * out of the public fields to keep the undefined bits out of the developer's way. 2380 * 2381 * Flag to hide only the home button. Don't use this 2382 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2383 */ 2384 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2385 2386 /** 2387 * @hide 2388 * 2389 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2390 * out of the public fields to keep the undefined bits out of the developer's way. 2391 * 2392 * Flag to hide only the back button. Don't use this 2393 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2394 */ 2395 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2396 2397 /** 2398 * @hide 2399 * 2400 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2401 * out of the public fields to keep the undefined bits out of the developer's way. 2402 * 2403 * Flag to hide only the clock. You might use this if your activity has 2404 * its own clock making the status bar's clock redundant. 2405 */ 2406 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2407 2408 /** 2409 * @hide 2410 * 2411 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2412 * out of the public fields to keep the undefined bits out of the developer's way. 2413 * 2414 * Flag to hide only the recent apps button. Don't use this 2415 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2416 */ 2417 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2418 2419 /** 2420 * @hide 2421 */ 2422 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2423 2424 /** 2425 * These are the system UI flags that can be cleared by events outside 2426 * of an application. Currently this is just the ability to tap on the 2427 * screen while hiding the navigation bar to have it return. 2428 * @hide 2429 */ 2430 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2431 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2432 | SYSTEM_UI_FLAG_FULLSCREEN; 2433 2434 /** 2435 * Flags that can impact the layout in relation to system UI. 2436 */ 2437 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2438 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2439 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2440 2441 /** 2442 * Find views that render the specified text. 2443 * 2444 * @see #findViewsWithText(ArrayList, CharSequence, int) 2445 */ 2446 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2447 2448 /** 2449 * Find find views that contain the specified content description. 2450 * 2451 * @see #findViewsWithText(ArrayList, CharSequence, int) 2452 */ 2453 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2454 2455 /** 2456 * Find views that contain {@link AccessibilityNodeProvider}. Such 2457 * a View is a root of virtual view hierarchy and may contain the searched 2458 * text. If this flag is set Views with providers are automatically 2459 * added and it is a responsibility of the client to call the APIs of 2460 * the provider to determine whether the virtual tree rooted at this View 2461 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2462 * represeting the virtual views with this text. 2463 * 2464 * @see #findViewsWithText(ArrayList, CharSequence, int) 2465 * 2466 * @hide 2467 */ 2468 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2469 2470 /** 2471 * Indicates that the screen has changed state and is now off. 2472 * 2473 * @see #onScreenStateChanged(int) 2474 */ 2475 public static final int SCREEN_STATE_OFF = 0x0; 2476 2477 /** 2478 * Indicates that the screen has changed state and is now on. 2479 * 2480 * @see #onScreenStateChanged(int) 2481 */ 2482 public static final int SCREEN_STATE_ON = 0x1; 2483 2484 /** 2485 * Controls the over-scroll mode for this view. 2486 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2487 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2488 * and {@link #OVER_SCROLL_NEVER}. 2489 */ 2490 private int mOverScrollMode; 2491 2492 /** 2493 * The parent this view is attached to. 2494 * {@hide} 2495 * 2496 * @see #getParent() 2497 */ 2498 protected ViewParent mParent; 2499 2500 /** 2501 * {@hide} 2502 */ 2503 AttachInfo mAttachInfo; 2504 2505 /** 2506 * {@hide} 2507 */ 2508 @ViewDebug.ExportedProperty(flagMapping = { 2509 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2510 name = "FORCE_LAYOUT"), 2511 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2512 name = "LAYOUT_REQUIRED"), 2513 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2514 name = "DRAWING_CACHE_INVALID", outputIf = false), 2515 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2516 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2517 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2518 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2519 }) 2520 int mPrivateFlags; 2521 int mPrivateFlags2; 2522 2523 /** 2524 * This view's request for the visibility of the status bar. 2525 * @hide 2526 */ 2527 @ViewDebug.ExportedProperty(flagMapping = { 2528 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2529 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2530 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2531 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2532 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2533 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2534 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2535 equals = SYSTEM_UI_FLAG_VISIBLE, 2536 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2537 }) 2538 int mSystemUiVisibility; 2539 2540 /** 2541 * Reference count for transient state. 2542 * @see #setHasTransientState(boolean) 2543 */ 2544 int mTransientStateCount = 0; 2545 2546 /** 2547 * Count of how many windows this view has been attached to. 2548 */ 2549 int mWindowAttachCount; 2550 2551 /** 2552 * The layout parameters associated with this view and used by the parent 2553 * {@link android.view.ViewGroup} to determine how this view should be 2554 * laid out. 2555 * {@hide} 2556 */ 2557 protected ViewGroup.LayoutParams mLayoutParams; 2558 2559 /** 2560 * The view flags hold various views states. 2561 * {@hide} 2562 */ 2563 @ViewDebug.ExportedProperty 2564 int mViewFlags; 2565 2566 static class TransformationInfo { 2567 /** 2568 * The transform matrix for the View. This transform is calculated internally 2569 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2570 * is used by default. Do *not* use this variable directly; instead call 2571 * getMatrix(), which will automatically recalculate the matrix if necessary 2572 * to get the correct matrix based on the latest rotation and scale properties. 2573 */ 2574 private final Matrix mMatrix = new Matrix(); 2575 2576 /** 2577 * The transform matrix for the View. This transform is calculated internally 2578 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2579 * is used by default. Do *not* use this variable directly; instead call 2580 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2581 * to get the correct matrix based on the latest rotation and scale properties. 2582 */ 2583 private Matrix mInverseMatrix; 2584 2585 /** 2586 * An internal variable that tracks whether we need to recalculate the 2587 * transform matrix, based on whether the rotation or scaleX/Y properties 2588 * have changed since the matrix was last calculated. 2589 */ 2590 boolean mMatrixDirty = false; 2591 2592 /** 2593 * An internal variable that tracks whether we need to recalculate the 2594 * transform matrix, based on whether the rotation or scaleX/Y properties 2595 * have changed since the matrix was last calculated. 2596 */ 2597 private boolean mInverseMatrixDirty = true; 2598 2599 /** 2600 * A variable that tracks whether we need to recalculate the 2601 * transform matrix, based on whether the rotation or scaleX/Y properties 2602 * have changed since the matrix was last calculated. This variable 2603 * is only valid after a call to updateMatrix() or to a function that 2604 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2605 */ 2606 private boolean mMatrixIsIdentity = true; 2607 2608 /** 2609 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2610 */ 2611 private Camera mCamera = null; 2612 2613 /** 2614 * This matrix is used when computing the matrix for 3D rotations. 2615 */ 2616 private Matrix matrix3D = null; 2617 2618 /** 2619 * These prev values are used to recalculate a centered pivot point when necessary. The 2620 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2621 * set), so thes values are only used then as well. 2622 */ 2623 private int mPrevWidth = -1; 2624 private int mPrevHeight = -1; 2625 2626 /** 2627 * The degrees rotation around the vertical axis through the pivot point. 2628 */ 2629 @ViewDebug.ExportedProperty 2630 float mRotationY = 0f; 2631 2632 /** 2633 * The degrees rotation around the horizontal axis through the pivot point. 2634 */ 2635 @ViewDebug.ExportedProperty 2636 float mRotationX = 0f; 2637 2638 /** 2639 * The degrees rotation around the pivot point. 2640 */ 2641 @ViewDebug.ExportedProperty 2642 float mRotation = 0f; 2643 2644 /** 2645 * The amount of translation of the object away from its left property (post-layout). 2646 */ 2647 @ViewDebug.ExportedProperty 2648 float mTranslationX = 0f; 2649 2650 /** 2651 * The amount of translation of the object away from its top property (post-layout). 2652 */ 2653 @ViewDebug.ExportedProperty 2654 float mTranslationY = 0f; 2655 2656 /** 2657 * The amount of scale in the x direction around the pivot point. A 2658 * value of 1 means no scaling is applied. 2659 */ 2660 @ViewDebug.ExportedProperty 2661 float mScaleX = 1f; 2662 2663 /** 2664 * The amount of scale in the y direction around the pivot point. A 2665 * value of 1 means no scaling is applied. 2666 */ 2667 @ViewDebug.ExportedProperty 2668 float mScaleY = 1f; 2669 2670 /** 2671 * The x location of the point around which the view is rotated and scaled. 2672 */ 2673 @ViewDebug.ExportedProperty 2674 float mPivotX = 0f; 2675 2676 /** 2677 * The y location of the point around which the view is rotated and scaled. 2678 */ 2679 @ViewDebug.ExportedProperty 2680 float mPivotY = 0f; 2681 2682 /** 2683 * The opacity of the View. This is a value from 0 to 1, where 0 means 2684 * completely transparent and 1 means completely opaque. 2685 */ 2686 @ViewDebug.ExportedProperty 2687 float mAlpha = 1f; 2688 } 2689 2690 TransformationInfo mTransformationInfo; 2691 2692 private boolean mLastIsOpaque; 2693 2694 /** 2695 * Convenience value to check for float values that are close enough to zero to be considered 2696 * zero. 2697 */ 2698 private static final float NONZERO_EPSILON = .001f; 2699 2700 /** 2701 * The distance in pixels from the left edge of this view's parent 2702 * to the left edge of this view. 2703 * {@hide} 2704 */ 2705 @ViewDebug.ExportedProperty(category = "layout") 2706 protected int mLeft; 2707 /** 2708 * The distance in pixels from the left edge of this view's parent 2709 * to the right edge of this view. 2710 * {@hide} 2711 */ 2712 @ViewDebug.ExportedProperty(category = "layout") 2713 protected int mRight; 2714 /** 2715 * The distance in pixels from the top edge of this view's parent 2716 * to the top edge of this view. 2717 * {@hide} 2718 */ 2719 @ViewDebug.ExportedProperty(category = "layout") 2720 protected int mTop; 2721 /** 2722 * The distance in pixels from the top edge of this view's parent 2723 * to the bottom edge of this view. 2724 * {@hide} 2725 */ 2726 @ViewDebug.ExportedProperty(category = "layout") 2727 protected int mBottom; 2728 2729 /** 2730 * The offset, in pixels, by which the content of this view is scrolled 2731 * horizontally. 2732 * {@hide} 2733 */ 2734 @ViewDebug.ExportedProperty(category = "scrolling") 2735 protected int mScrollX; 2736 /** 2737 * The offset, in pixels, by which the content of this view is scrolled 2738 * vertically. 2739 * {@hide} 2740 */ 2741 @ViewDebug.ExportedProperty(category = "scrolling") 2742 protected int mScrollY; 2743 2744 /** 2745 * The left padding in pixels, that is the distance in pixels between the 2746 * left edge of this view and the left edge of its content. 2747 * {@hide} 2748 */ 2749 @ViewDebug.ExportedProperty(category = "padding") 2750 protected int mPaddingLeft; 2751 /** 2752 * The right padding in pixels, that is the distance in pixels between the 2753 * right edge of this view and the right edge of its content. 2754 * {@hide} 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 protected int mPaddingRight; 2758 /** 2759 * The top padding in pixels, that is the distance in pixels between the 2760 * top edge of this view and the top edge of its content. 2761 * {@hide} 2762 */ 2763 @ViewDebug.ExportedProperty(category = "padding") 2764 protected int mPaddingTop; 2765 /** 2766 * The bottom padding in pixels, that is the distance in pixels between the 2767 * bottom edge of this view and the bottom edge of its content. 2768 * {@hide} 2769 */ 2770 @ViewDebug.ExportedProperty(category = "padding") 2771 protected int mPaddingBottom; 2772 2773 /** 2774 * The layout insets in pixels, that is the distance in pixels between the 2775 * visible edges of this view its bounds. 2776 */ 2777 private Insets mLayoutInsets; 2778 2779 /** 2780 * Briefly describes the view and is primarily used for accessibility support. 2781 */ 2782 private CharSequence mContentDescription; 2783 2784 /** 2785 * Cache the paddingRight set by the user to append to the scrollbar's size. 2786 * 2787 * @hide 2788 */ 2789 @ViewDebug.ExportedProperty(category = "padding") 2790 protected int mUserPaddingRight; 2791 2792 /** 2793 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2794 * 2795 * @hide 2796 */ 2797 @ViewDebug.ExportedProperty(category = "padding") 2798 protected int mUserPaddingBottom; 2799 2800 /** 2801 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2802 * 2803 * @hide 2804 */ 2805 @ViewDebug.ExportedProperty(category = "padding") 2806 protected int mUserPaddingLeft; 2807 2808 /** 2809 * Cache if the user padding is relative. 2810 * 2811 */ 2812 @ViewDebug.ExportedProperty(category = "padding") 2813 boolean mUserPaddingRelative; 2814 2815 /** 2816 * Cache the paddingStart set by the user to append to the scrollbar's size. 2817 * 2818 */ 2819 @ViewDebug.ExportedProperty(category = "padding") 2820 int mUserPaddingStart; 2821 2822 /** 2823 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2824 * 2825 */ 2826 @ViewDebug.ExportedProperty(category = "padding") 2827 int mUserPaddingEnd; 2828 2829 /** 2830 * @hide 2831 */ 2832 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2833 /** 2834 * @hide 2835 */ 2836 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2837 2838 private Drawable mBackground; 2839 2840 private int mBackgroundResource; 2841 private boolean mBackgroundSizeChanged; 2842 2843 static class ListenerInfo { 2844 /** 2845 * Listener used to dispatch focus change events. 2846 * This field should be made private, so it is hidden from the SDK. 2847 * {@hide} 2848 */ 2849 protected OnFocusChangeListener mOnFocusChangeListener; 2850 2851 /** 2852 * Listeners for layout change events. 2853 */ 2854 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2855 2856 /** 2857 * Listeners for attach events. 2858 */ 2859 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2860 2861 /** 2862 * Listener used to dispatch click events. 2863 * This field should be made private, so it is hidden from the SDK. 2864 * {@hide} 2865 */ 2866 public OnClickListener mOnClickListener; 2867 2868 /** 2869 * Listener used to dispatch long click events. 2870 * This field should be made private, so it is hidden from the SDK. 2871 * {@hide} 2872 */ 2873 protected OnLongClickListener mOnLongClickListener; 2874 2875 /** 2876 * Listener used to build the context menu. 2877 * This field should be made private, so it is hidden from the SDK. 2878 * {@hide} 2879 */ 2880 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2881 2882 private OnKeyListener mOnKeyListener; 2883 2884 private OnTouchListener mOnTouchListener; 2885 2886 private OnHoverListener mOnHoverListener; 2887 2888 private OnGenericMotionListener mOnGenericMotionListener; 2889 2890 private OnDragListener mOnDragListener; 2891 2892 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2893 } 2894 2895 ListenerInfo mListenerInfo; 2896 2897 /** 2898 * The application environment this view lives in. 2899 * This field should be made private, so it is hidden from the SDK. 2900 * {@hide} 2901 */ 2902 protected Context mContext; 2903 2904 private final Resources mResources; 2905 2906 private ScrollabilityCache mScrollCache; 2907 2908 private int[] mDrawableState = null; 2909 2910 /** 2911 * Set to true when drawing cache is enabled and cannot be created. 2912 * 2913 * @hide 2914 */ 2915 public boolean mCachingFailed; 2916 2917 private Bitmap mDrawingCache; 2918 private Bitmap mUnscaledDrawingCache; 2919 private HardwareLayer mHardwareLayer; 2920 DisplayList mDisplayList; 2921 2922 /** 2923 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2924 * the user may specify which view to go to next. 2925 */ 2926 private int mNextFocusLeftId = View.NO_ID; 2927 2928 /** 2929 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2930 * the user may specify which view to go to next. 2931 */ 2932 private int mNextFocusRightId = View.NO_ID; 2933 2934 /** 2935 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2936 * the user may specify which view to go to next. 2937 */ 2938 private int mNextFocusUpId = View.NO_ID; 2939 2940 /** 2941 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2942 * the user may specify which view to go to next. 2943 */ 2944 private int mNextFocusDownId = View.NO_ID; 2945 2946 /** 2947 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2948 * the user may specify which view to go to next. 2949 */ 2950 int mNextFocusForwardId = View.NO_ID; 2951 2952 private CheckForLongPress mPendingCheckForLongPress; 2953 private CheckForTap mPendingCheckForTap = null; 2954 private PerformClick mPerformClick; 2955 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2956 2957 private UnsetPressedState mUnsetPressedState; 2958 2959 /** 2960 * Whether the long press's action has been invoked. The tap's action is invoked on the 2961 * up event while a long press is invoked as soon as the long press duration is reached, so 2962 * a long press could be performed before the tap is checked, in which case the tap's action 2963 * should not be invoked. 2964 */ 2965 private boolean mHasPerformedLongPress; 2966 2967 /** 2968 * The minimum height of the view. We'll try our best to have the height 2969 * of this view to at least this amount. 2970 */ 2971 @ViewDebug.ExportedProperty(category = "measurement") 2972 private int mMinHeight; 2973 2974 /** 2975 * The minimum width of the view. We'll try our best to have the width 2976 * of this view to at least this amount. 2977 */ 2978 @ViewDebug.ExportedProperty(category = "measurement") 2979 private int mMinWidth; 2980 2981 /** 2982 * The delegate to handle touch events that are physically in this view 2983 * but should be handled by another view. 2984 */ 2985 private TouchDelegate mTouchDelegate = null; 2986 2987 /** 2988 * Solid color to use as a background when creating the drawing cache. Enables 2989 * the cache to use 16 bit bitmaps instead of 32 bit. 2990 */ 2991 private int mDrawingCacheBackgroundColor = 0; 2992 2993 /** 2994 * Special tree observer used when mAttachInfo is null. 2995 */ 2996 private ViewTreeObserver mFloatingTreeObserver; 2997 2998 /** 2999 * Cache the touch slop from the context that created the view. 3000 */ 3001 private int mTouchSlop; 3002 3003 /** 3004 * Object that handles automatic animation of view properties. 3005 */ 3006 private ViewPropertyAnimator mAnimator = null; 3007 3008 /** 3009 * Flag indicating that a drag can cross window boundaries. When 3010 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3011 * with this flag set, all visible applications will be able to participate 3012 * in the drag operation and receive the dragged content. 3013 * 3014 * @hide 3015 */ 3016 public static final int DRAG_FLAG_GLOBAL = 1; 3017 3018 /** 3019 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3020 */ 3021 private float mVerticalScrollFactor; 3022 3023 /** 3024 * Position of the vertical scroll bar. 3025 */ 3026 private int mVerticalScrollbarPosition; 3027 3028 /** 3029 * Position the scroll bar at the default position as determined by the system. 3030 */ 3031 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3032 3033 /** 3034 * Position the scroll bar along the left edge. 3035 */ 3036 public static final int SCROLLBAR_POSITION_LEFT = 1; 3037 3038 /** 3039 * Position the scroll bar along the right edge. 3040 */ 3041 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3042 3043 /** 3044 * Indicates that the view does not have a layer. 3045 * 3046 * @see #getLayerType() 3047 * @see #setLayerType(int, android.graphics.Paint) 3048 * @see #LAYER_TYPE_SOFTWARE 3049 * @see #LAYER_TYPE_HARDWARE 3050 */ 3051 public static final int LAYER_TYPE_NONE = 0; 3052 3053 /** 3054 * <p>Indicates that the view has a software layer. A software layer is backed 3055 * by a bitmap and causes the view to be rendered using Android's software 3056 * rendering pipeline, even if hardware acceleration is enabled.</p> 3057 * 3058 * <p>Software layers have various usages:</p> 3059 * <p>When the application is not using hardware acceleration, a software layer 3060 * is useful to apply a specific color filter and/or blending mode and/or 3061 * translucency to a view and all its children.</p> 3062 * <p>When the application is using hardware acceleration, a software layer 3063 * is useful to render drawing primitives not supported by the hardware 3064 * accelerated pipeline. It can also be used to cache a complex view tree 3065 * into a texture and reduce the complexity of drawing operations. For instance, 3066 * when animating a complex view tree with a translation, a software layer can 3067 * be used to render the view tree only once.</p> 3068 * <p>Software layers should be avoided when the affected view tree updates 3069 * often. Every update will require to re-render the software layer, which can 3070 * potentially be slow (particularly when hardware acceleration is turned on 3071 * since the layer will have to be uploaded into a hardware texture after every 3072 * update.)</p> 3073 * 3074 * @see #getLayerType() 3075 * @see #setLayerType(int, android.graphics.Paint) 3076 * @see #LAYER_TYPE_NONE 3077 * @see #LAYER_TYPE_HARDWARE 3078 */ 3079 public static final int LAYER_TYPE_SOFTWARE = 1; 3080 3081 /** 3082 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3083 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3084 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3085 * rendering pipeline, but only if hardware acceleration is turned on for the 3086 * view hierarchy. When hardware acceleration is turned off, hardware layers 3087 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3088 * 3089 * <p>A hardware layer is useful to apply a specific color filter and/or 3090 * blending mode and/or translucency to a view and all its children.</p> 3091 * <p>A hardware layer can be used to cache a complex view tree into a 3092 * texture and reduce the complexity of drawing operations. For instance, 3093 * when animating a complex view tree with a translation, a hardware layer can 3094 * be used to render the view tree only once.</p> 3095 * <p>A hardware layer can also be used to increase the rendering quality when 3096 * rotation transformations are applied on a view. It can also be used to 3097 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3098 * 3099 * @see #getLayerType() 3100 * @see #setLayerType(int, android.graphics.Paint) 3101 * @see #LAYER_TYPE_NONE 3102 * @see #LAYER_TYPE_SOFTWARE 3103 */ 3104 public static final int LAYER_TYPE_HARDWARE = 2; 3105 3106 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3107 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3108 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3109 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3110 }) 3111 int mLayerType = LAYER_TYPE_NONE; 3112 Paint mLayerPaint; 3113 Rect mLocalDirtyRect; 3114 3115 /** 3116 * Set to true when the view is sending hover accessibility events because it 3117 * is the innermost hovered view. 3118 */ 3119 private boolean mSendingHoverAccessibilityEvents; 3120 3121 /** 3122 * Simple constructor to use when creating a view from code. 3123 * 3124 * @param context The Context the view is running in, through which it can 3125 * access the current theme, resources, etc. 3126 */ 3127 public View(Context context) { 3128 mContext = context; 3129 mResources = context != null ? context.getResources() : null; 3130 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3131 // Set layout and text direction defaults 3132 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3133 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3134 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3135 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3136 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3137 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3138 mUserPaddingStart = -1; 3139 mUserPaddingEnd = -1; 3140 mUserPaddingRelative = false; 3141 } 3142 3143 /** 3144 * Delegate for injecting accessiblity functionality. 3145 */ 3146 AccessibilityDelegate mAccessibilityDelegate; 3147 3148 /** 3149 * Consistency verifier for debugging purposes. 3150 * @hide 3151 */ 3152 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3153 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3154 new InputEventConsistencyVerifier(this, 0) : null; 3155 3156 /** 3157 * Constructor that is called when inflating a view from XML. This is called 3158 * when a view is being constructed from an XML file, supplying attributes 3159 * that were specified in the XML file. This version uses a default style of 3160 * 0, so the only attribute values applied are those in the Context's Theme 3161 * and the given AttributeSet. 3162 * 3163 * <p> 3164 * The method onFinishInflate() will be called after all children have been 3165 * added. 3166 * 3167 * @param context The Context the view is running in, through which it can 3168 * access the current theme, resources, etc. 3169 * @param attrs The attributes of the XML tag that is inflating the view. 3170 * @see #View(Context, AttributeSet, int) 3171 */ 3172 public View(Context context, AttributeSet attrs) { 3173 this(context, attrs, 0); 3174 } 3175 3176 /** 3177 * Perform inflation from XML and apply a class-specific base style. This 3178 * constructor of View allows subclasses to use their own base style when 3179 * they are inflating. For example, a Button class's constructor would call 3180 * this version of the super class constructor and supply 3181 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3182 * the theme's button style to modify all of the base view attributes (in 3183 * particular its background) as well as the Button class's attributes. 3184 * 3185 * @param context The Context the view is running in, through which it can 3186 * access the current theme, resources, etc. 3187 * @param attrs The attributes of the XML tag that is inflating the view. 3188 * @param defStyle The default style to apply to this view. If 0, no style 3189 * will be applied (beyond what is included in the theme). This may 3190 * either be an attribute resource, whose value will be retrieved 3191 * from the current theme, or an explicit style resource. 3192 * @see #View(Context, AttributeSet) 3193 */ 3194 public View(Context context, AttributeSet attrs, int defStyle) { 3195 this(context); 3196 3197 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3198 defStyle, 0); 3199 3200 Drawable background = null; 3201 3202 int leftPadding = -1; 3203 int topPadding = -1; 3204 int rightPadding = -1; 3205 int bottomPadding = -1; 3206 int startPadding = -1; 3207 int endPadding = -1; 3208 3209 int padding = -1; 3210 3211 int viewFlagValues = 0; 3212 int viewFlagMasks = 0; 3213 3214 boolean setScrollContainer = false; 3215 3216 int x = 0; 3217 int y = 0; 3218 3219 float tx = 0; 3220 float ty = 0; 3221 float rotation = 0; 3222 float rotationX = 0; 3223 float rotationY = 0; 3224 float sx = 1f; 3225 float sy = 1f; 3226 boolean transformSet = false; 3227 3228 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3229 3230 int overScrollMode = mOverScrollMode; 3231 final int N = a.getIndexCount(); 3232 for (int i = 0; i < N; i++) { 3233 int attr = a.getIndex(i); 3234 switch (attr) { 3235 case com.android.internal.R.styleable.View_background: 3236 background = a.getDrawable(attr); 3237 break; 3238 case com.android.internal.R.styleable.View_padding: 3239 padding = a.getDimensionPixelSize(attr, -1); 3240 break; 3241 case com.android.internal.R.styleable.View_paddingLeft: 3242 leftPadding = a.getDimensionPixelSize(attr, -1); 3243 break; 3244 case com.android.internal.R.styleable.View_paddingTop: 3245 topPadding = a.getDimensionPixelSize(attr, -1); 3246 break; 3247 case com.android.internal.R.styleable.View_paddingRight: 3248 rightPadding = a.getDimensionPixelSize(attr, -1); 3249 break; 3250 case com.android.internal.R.styleable.View_paddingBottom: 3251 bottomPadding = a.getDimensionPixelSize(attr, -1); 3252 break; 3253 case com.android.internal.R.styleable.View_paddingStart: 3254 startPadding = a.getDimensionPixelSize(attr, -1); 3255 break; 3256 case com.android.internal.R.styleable.View_paddingEnd: 3257 endPadding = a.getDimensionPixelSize(attr, -1); 3258 break; 3259 case com.android.internal.R.styleable.View_scrollX: 3260 x = a.getDimensionPixelOffset(attr, 0); 3261 break; 3262 case com.android.internal.R.styleable.View_scrollY: 3263 y = a.getDimensionPixelOffset(attr, 0); 3264 break; 3265 case com.android.internal.R.styleable.View_alpha: 3266 setAlpha(a.getFloat(attr, 1f)); 3267 break; 3268 case com.android.internal.R.styleable.View_transformPivotX: 3269 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3270 break; 3271 case com.android.internal.R.styleable.View_transformPivotY: 3272 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3273 break; 3274 case com.android.internal.R.styleable.View_translationX: 3275 tx = a.getDimensionPixelOffset(attr, 0); 3276 transformSet = true; 3277 break; 3278 case com.android.internal.R.styleable.View_translationY: 3279 ty = a.getDimensionPixelOffset(attr, 0); 3280 transformSet = true; 3281 break; 3282 case com.android.internal.R.styleable.View_rotation: 3283 rotation = a.getFloat(attr, 0); 3284 transformSet = true; 3285 break; 3286 case com.android.internal.R.styleable.View_rotationX: 3287 rotationX = a.getFloat(attr, 0); 3288 transformSet = true; 3289 break; 3290 case com.android.internal.R.styleable.View_rotationY: 3291 rotationY = a.getFloat(attr, 0); 3292 transformSet = true; 3293 break; 3294 case com.android.internal.R.styleable.View_scaleX: 3295 sx = a.getFloat(attr, 1f); 3296 transformSet = true; 3297 break; 3298 case com.android.internal.R.styleable.View_scaleY: 3299 sy = a.getFloat(attr, 1f); 3300 transformSet = true; 3301 break; 3302 case com.android.internal.R.styleable.View_id: 3303 mID = a.getResourceId(attr, NO_ID); 3304 break; 3305 case com.android.internal.R.styleable.View_tag: 3306 mTag = a.getText(attr); 3307 break; 3308 case com.android.internal.R.styleable.View_fitsSystemWindows: 3309 if (a.getBoolean(attr, false)) { 3310 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3311 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3312 } 3313 break; 3314 case com.android.internal.R.styleable.View_focusable: 3315 if (a.getBoolean(attr, false)) { 3316 viewFlagValues |= FOCUSABLE; 3317 viewFlagMasks |= FOCUSABLE_MASK; 3318 } 3319 break; 3320 case com.android.internal.R.styleable.View_focusableInTouchMode: 3321 if (a.getBoolean(attr, false)) { 3322 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3323 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3324 } 3325 break; 3326 case com.android.internal.R.styleable.View_clickable: 3327 if (a.getBoolean(attr, false)) { 3328 viewFlagValues |= CLICKABLE; 3329 viewFlagMasks |= CLICKABLE; 3330 } 3331 break; 3332 case com.android.internal.R.styleable.View_longClickable: 3333 if (a.getBoolean(attr, false)) { 3334 viewFlagValues |= LONG_CLICKABLE; 3335 viewFlagMasks |= LONG_CLICKABLE; 3336 } 3337 break; 3338 case com.android.internal.R.styleable.View_saveEnabled: 3339 if (!a.getBoolean(attr, true)) { 3340 viewFlagValues |= SAVE_DISABLED; 3341 viewFlagMasks |= SAVE_DISABLED_MASK; 3342 } 3343 break; 3344 case com.android.internal.R.styleable.View_duplicateParentState: 3345 if (a.getBoolean(attr, false)) { 3346 viewFlagValues |= DUPLICATE_PARENT_STATE; 3347 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3348 } 3349 break; 3350 case com.android.internal.R.styleable.View_visibility: 3351 final int visibility = a.getInt(attr, 0); 3352 if (visibility != 0) { 3353 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3354 viewFlagMasks |= VISIBILITY_MASK; 3355 } 3356 break; 3357 case com.android.internal.R.styleable.View_layoutDirection: 3358 // Clear any layout direction flags (included resolved bits) already set 3359 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3360 // Set the layout direction flags depending on the value of the attribute 3361 final int layoutDirection = a.getInt(attr, -1); 3362 final int value = (layoutDirection != -1) ? 3363 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3364 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3365 break; 3366 case com.android.internal.R.styleable.View_drawingCacheQuality: 3367 final int cacheQuality = a.getInt(attr, 0); 3368 if (cacheQuality != 0) { 3369 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3370 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3371 } 3372 break; 3373 case com.android.internal.R.styleable.View_contentDescription: 3374 mContentDescription = a.getString(attr); 3375 break; 3376 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3377 if (!a.getBoolean(attr, true)) { 3378 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3379 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3380 } 3381 break; 3382 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3383 if (!a.getBoolean(attr, true)) { 3384 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3385 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3386 } 3387 break; 3388 case R.styleable.View_scrollbars: 3389 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3390 if (scrollbars != SCROLLBARS_NONE) { 3391 viewFlagValues |= scrollbars; 3392 viewFlagMasks |= SCROLLBARS_MASK; 3393 initializeScrollbars(a); 3394 } 3395 break; 3396 //noinspection deprecation 3397 case R.styleable.View_fadingEdge: 3398 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3399 // Ignore the attribute starting with ICS 3400 break; 3401 } 3402 // With builds < ICS, fall through and apply fading edges 3403 case R.styleable.View_requiresFadingEdge: 3404 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3405 if (fadingEdge != FADING_EDGE_NONE) { 3406 viewFlagValues |= fadingEdge; 3407 viewFlagMasks |= FADING_EDGE_MASK; 3408 initializeFadingEdge(a); 3409 } 3410 break; 3411 case R.styleable.View_scrollbarStyle: 3412 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3413 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3414 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3415 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3416 } 3417 break; 3418 case R.styleable.View_isScrollContainer: 3419 setScrollContainer = true; 3420 if (a.getBoolean(attr, false)) { 3421 setScrollContainer(true); 3422 } 3423 break; 3424 case com.android.internal.R.styleable.View_keepScreenOn: 3425 if (a.getBoolean(attr, false)) { 3426 viewFlagValues |= KEEP_SCREEN_ON; 3427 viewFlagMasks |= KEEP_SCREEN_ON; 3428 } 3429 break; 3430 case R.styleable.View_filterTouchesWhenObscured: 3431 if (a.getBoolean(attr, false)) { 3432 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3433 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3434 } 3435 break; 3436 case R.styleable.View_nextFocusLeft: 3437 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3438 break; 3439 case R.styleable.View_nextFocusRight: 3440 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3441 break; 3442 case R.styleable.View_nextFocusUp: 3443 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3444 break; 3445 case R.styleable.View_nextFocusDown: 3446 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3447 break; 3448 case R.styleable.View_nextFocusForward: 3449 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3450 break; 3451 case R.styleable.View_minWidth: 3452 mMinWidth = a.getDimensionPixelSize(attr, 0); 3453 break; 3454 case R.styleable.View_minHeight: 3455 mMinHeight = a.getDimensionPixelSize(attr, 0); 3456 break; 3457 case R.styleable.View_onClick: 3458 if (context.isRestricted()) { 3459 throw new IllegalStateException("The android:onClick attribute cannot " 3460 + "be used within a restricted context"); 3461 } 3462 3463 final String handlerName = a.getString(attr); 3464 if (handlerName != null) { 3465 setOnClickListener(new OnClickListener() { 3466 private Method mHandler; 3467 3468 public void onClick(View v) { 3469 if (mHandler == null) { 3470 try { 3471 mHandler = getContext().getClass().getMethod(handlerName, 3472 View.class); 3473 } catch (NoSuchMethodException e) { 3474 int id = getId(); 3475 String idText = id == NO_ID ? "" : " with id '" 3476 + getContext().getResources().getResourceEntryName( 3477 id) + "'"; 3478 throw new IllegalStateException("Could not find a method " + 3479 handlerName + "(View) in the activity " 3480 + getContext().getClass() + " for onClick handler" 3481 + " on view " + View.this.getClass() + idText, e); 3482 } 3483 } 3484 3485 try { 3486 mHandler.invoke(getContext(), View.this); 3487 } catch (IllegalAccessException e) { 3488 throw new IllegalStateException("Could not execute non " 3489 + "public method of the activity", e); 3490 } catch (InvocationTargetException e) { 3491 throw new IllegalStateException("Could not execute " 3492 + "method of the activity", e); 3493 } 3494 } 3495 }); 3496 } 3497 break; 3498 case R.styleable.View_overScrollMode: 3499 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3500 break; 3501 case R.styleable.View_verticalScrollbarPosition: 3502 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3503 break; 3504 case R.styleable.View_layerType: 3505 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3506 break; 3507 case R.styleable.View_textDirection: 3508 // Clear any text direction flag already set 3509 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3510 // Set the text direction flags depending on the value of the attribute 3511 final int textDirection = a.getInt(attr, -1); 3512 if (textDirection != -1) { 3513 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3514 } 3515 break; 3516 case R.styleable.View_textAlignment: 3517 // Clear any text alignment flag already set 3518 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3519 // Set the text alignment flag depending on the value of the attribute 3520 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3521 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3522 break; 3523 case R.styleable.View_importantForAccessibility: 3524 setImportantForAccessibility(a.getInt(attr, 3525 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3526 } 3527 } 3528 3529 a.recycle(); 3530 3531 setOverScrollMode(overScrollMode); 3532 3533 if (background != null) { 3534 setBackground(background); 3535 } 3536 3537 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3538 // layout direction). Those cached values will be used later during padding resolution. 3539 mUserPaddingStart = startPadding; 3540 mUserPaddingEnd = endPadding; 3541 3542 updateUserPaddingRelative(); 3543 3544 if (padding >= 0) { 3545 leftPadding = padding; 3546 topPadding = padding; 3547 rightPadding = padding; 3548 bottomPadding = padding; 3549 } 3550 3551 // If the user specified the padding (either with android:padding or 3552 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3553 // use the default padding or the padding from the background drawable 3554 // (stored at this point in mPadding*) 3555 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3556 topPadding >= 0 ? topPadding : mPaddingTop, 3557 rightPadding >= 0 ? rightPadding : mPaddingRight, 3558 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3559 3560 if (viewFlagMasks != 0) { 3561 setFlags(viewFlagValues, viewFlagMasks); 3562 } 3563 3564 // Needs to be called after mViewFlags is set 3565 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3566 recomputePadding(); 3567 } 3568 3569 if (x != 0 || y != 0) { 3570 scrollTo(x, y); 3571 } 3572 3573 if (transformSet) { 3574 setTranslationX(tx); 3575 setTranslationY(ty); 3576 setRotation(rotation); 3577 setRotationX(rotationX); 3578 setRotationY(rotationY); 3579 setScaleX(sx); 3580 setScaleY(sy); 3581 } 3582 3583 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3584 setScrollContainer(true); 3585 } 3586 3587 computeOpaqueFlags(); 3588 } 3589 3590 private void updateUserPaddingRelative() { 3591 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3592 } 3593 3594 /** 3595 * Non-public constructor for use in testing 3596 */ 3597 View() { 3598 mResources = null; 3599 } 3600 3601 /** 3602 * <p> 3603 * Initializes the fading edges from a given set of styled attributes. This 3604 * method should be called by subclasses that need fading edges and when an 3605 * instance of these subclasses is created programmatically rather than 3606 * being inflated from XML. This method is automatically called when the XML 3607 * is inflated. 3608 * </p> 3609 * 3610 * @param a the styled attributes set to initialize the fading edges from 3611 */ 3612 protected void initializeFadingEdge(TypedArray a) { 3613 initScrollCache(); 3614 3615 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3616 R.styleable.View_fadingEdgeLength, 3617 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3618 } 3619 3620 /** 3621 * Returns the size of the vertical faded edges used to indicate that more 3622 * content in this view is visible. 3623 * 3624 * @return The size in pixels of the vertical faded edge or 0 if vertical 3625 * faded edges are not enabled for this view. 3626 * @attr ref android.R.styleable#View_fadingEdgeLength 3627 */ 3628 public int getVerticalFadingEdgeLength() { 3629 if (isVerticalFadingEdgeEnabled()) { 3630 ScrollabilityCache cache = mScrollCache; 3631 if (cache != null) { 3632 return cache.fadingEdgeLength; 3633 } 3634 } 3635 return 0; 3636 } 3637 3638 /** 3639 * Set the size of the faded edge used to indicate that more content in this 3640 * view is available. Will not change whether the fading edge is enabled; use 3641 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3642 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3643 * for the vertical or horizontal fading edges. 3644 * 3645 * @param length The size in pixels of the faded edge used to indicate that more 3646 * content in this view is visible. 3647 */ 3648 public void setFadingEdgeLength(int length) { 3649 initScrollCache(); 3650 mScrollCache.fadingEdgeLength = length; 3651 } 3652 3653 /** 3654 * Returns the size of the horizontal faded edges used to indicate that more 3655 * content in this view is visible. 3656 * 3657 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3658 * faded edges are not enabled for this view. 3659 * @attr ref android.R.styleable#View_fadingEdgeLength 3660 */ 3661 public int getHorizontalFadingEdgeLength() { 3662 if (isHorizontalFadingEdgeEnabled()) { 3663 ScrollabilityCache cache = mScrollCache; 3664 if (cache != null) { 3665 return cache.fadingEdgeLength; 3666 } 3667 } 3668 return 0; 3669 } 3670 3671 /** 3672 * Returns the width of the vertical scrollbar. 3673 * 3674 * @return The width in pixels of the vertical scrollbar or 0 if there 3675 * is no vertical scrollbar. 3676 */ 3677 public int getVerticalScrollbarWidth() { 3678 ScrollabilityCache cache = mScrollCache; 3679 if (cache != null) { 3680 ScrollBarDrawable scrollBar = cache.scrollBar; 3681 if (scrollBar != null) { 3682 int size = scrollBar.getSize(true); 3683 if (size <= 0) { 3684 size = cache.scrollBarSize; 3685 } 3686 return size; 3687 } 3688 return 0; 3689 } 3690 return 0; 3691 } 3692 3693 /** 3694 * Returns the height of the horizontal scrollbar. 3695 * 3696 * @return The height in pixels of the horizontal scrollbar or 0 if 3697 * there is no horizontal scrollbar. 3698 */ 3699 protected int getHorizontalScrollbarHeight() { 3700 ScrollabilityCache cache = mScrollCache; 3701 if (cache != null) { 3702 ScrollBarDrawable scrollBar = cache.scrollBar; 3703 if (scrollBar != null) { 3704 int size = scrollBar.getSize(false); 3705 if (size <= 0) { 3706 size = cache.scrollBarSize; 3707 } 3708 return size; 3709 } 3710 return 0; 3711 } 3712 return 0; 3713 } 3714 3715 /** 3716 * <p> 3717 * Initializes the scrollbars from a given set of styled attributes. This 3718 * method should be called by subclasses that need scrollbars and when an 3719 * instance of these subclasses is created programmatically rather than 3720 * being inflated from XML. This method is automatically called when the XML 3721 * is inflated. 3722 * </p> 3723 * 3724 * @param a the styled attributes set to initialize the scrollbars from 3725 */ 3726 protected void initializeScrollbars(TypedArray a) { 3727 initScrollCache(); 3728 3729 final ScrollabilityCache scrollabilityCache = mScrollCache; 3730 3731 if (scrollabilityCache.scrollBar == null) { 3732 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3733 } 3734 3735 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3736 3737 if (!fadeScrollbars) { 3738 scrollabilityCache.state = ScrollabilityCache.ON; 3739 } 3740 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3741 3742 3743 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3744 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3745 .getScrollBarFadeDuration()); 3746 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3747 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3748 ViewConfiguration.getScrollDefaultDelay()); 3749 3750 3751 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3752 com.android.internal.R.styleable.View_scrollbarSize, 3753 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3754 3755 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3756 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3757 3758 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3759 if (thumb != null) { 3760 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3761 } 3762 3763 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3764 false); 3765 if (alwaysDraw) { 3766 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3767 } 3768 3769 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3770 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3771 3772 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3773 if (thumb != null) { 3774 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3775 } 3776 3777 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3778 false); 3779 if (alwaysDraw) { 3780 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3781 } 3782 3783 // Re-apply user/background padding so that scrollbar(s) get added 3784 resolvePadding(); 3785 } 3786 3787 /** 3788 * <p> 3789 * Initalizes the scrollability cache if necessary. 3790 * </p> 3791 */ 3792 private void initScrollCache() { 3793 if (mScrollCache == null) { 3794 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3795 } 3796 } 3797 3798 private ScrollabilityCache getScrollCache() { 3799 initScrollCache(); 3800 return mScrollCache; 3801 } 3802 3803 /** 3804 * Set the position of the vertical scroll bar. Should be one of 3805 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3806 * {@link #SCROLLBAR_POSITION_RIGHT}. 3807 * 3808 * @param position Where the vertical scroll bar should be positioned. 3809 */ 3810 public void setVerticalScrollbarPosition(int position) { 3811 if (mVerticalScrollbarPosition != position) { 3812 mVerticalScrollbarPosition = position; 3813 computeOpaqueFlags(); 3814 resolvePadding(); 3815 } 3816 } 3817 3818 /** 3819 * @return The position where the vertical scroll bar will show, if applicable. 3820 * @see #setVerticalScrollbarPosition(int) 3821 */ 3822 public int getVerticalScrollbarPosition() { 3823 return mVerticalScrollbarPosition; 3824 } 3825 3826 ListenerInfo getListenerInfo() { 3827 if (mListenerInfo != null) { 3828 return mListenerInfo; 3829 } 3830 mListenerInfo = new ListenerInfo(); 3831 return mListenerInfo; 3832 } 3833 3834 /** 3835 * Register a callback to be invoked when focus of this view changed. 3836 * 3837 * @param l The callback that will run. 3838 */ 3839 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3840 getListenerInfo().mOnFocusChangeListener = l; 3841 } 3842 3843 /** 3844 * Add a listener that will be called when the bounds of the view change due to 3845 * layout processing. 3846 * 3847 * @param listener The listener that will be called when layout bounds change. 3848 */ 3849 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3850 ListenerInfo li = getListenerInfo(); 3851 if (li.mOnLayoutChangeListeners == null) { 3852 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3853 } 3854 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3855 li.mOnLayoutChangeListeners.add(listener); 3856 } 3857 } 3858 3859 /** 3860 * Remove a listener for layout changes. 3861 * 3862 * @param listener The listener for layout bounds change. 3863 */ 3864 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3865 ListenerInfo li = mListenerInfo; 3866 if (li == null || li.mOnLayoutChangeListeners == null) { 3867 return; 3868 } 3869 li.mOnLayoutChangeListeners.remove(listener); 3870 } 3871 3872 /** 3873 * Add a listener for attach state changes. 3874 * 3875 * This listener will be called whenever this view is attached or detached 3876 * from a window. Remove the listener using 3877 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3878 * 3879 * @param listener Listener to attach 3880 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3881 */ 3882 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3883 ListenerInfo li = getListenerInfo(); 3884 if (li.mOnAttachStateChangeListeners == null) { 3885 li.mOnAttachStateChangeListeners 3886 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3887 } 3888 li.mOnAttachStateChangeListeners.add(listener); 3889 } 3890 3891 /** 3892 * Remove a listener for attach state changes. The listener will receive no further 3893 * notification of window attach/detach events. 3894 * 3895 * @param listener Listener to remove 3896 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3897 */ 3898 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3899 ListenerInfo li = mListenerInfo; 3900 if (li == null || li.mOnAttachStateChangeListeners == null) { 3901 return; 3902 } 3903 li.mOnAttachStateChangeListeners.remove(listener); 3904 } 3905 3906 /** 3907 * Returns the focus-change callback registered for this view. 3908 * 3909 * @return The callback, or null if one is not registered. 3910 */ 3911 public OnFocusChangeListener getOnFocusChangeListener() { 3912 ListenerInfo li = mListenerInfo; 3913 return li != null ? li.mOnFocusChangeListener : null; 3914 } 3915 3916 /** 3917 * Register a callback to be invoked when this view is clicked. If this view is not 3918 * clickable, it becomes clickable. 3919 * 3920 * @param l The callback that will run 3921 * 3922 * @see #setClickable(boolean) 3923 */ 3924 public void setOnClickListener(OnClickListener l) { 3925 if (!isClickable()) { 3926 setClickable(true); 3927 } 3928 getListenerInfo().mOnClickListener = l; 3929 } 3930 3931 /** 3932 * Return whether this view has an attached OnClickListener. Returns 3933 * true if there is a listener, false if there is none. 3934 */ 3935 public boolean hasOnClickListeners() { 3936 ListenerInfo li = mListenerInfo; 3937 return (li != null && li.mOnClickListener != null); 3938 } 3939 3940 /** 3941 * Register a callback to be invoked when this view is clicked and held. If this view is not 3942 * long clickable, it becomes long clickable. 3943 * 3944 * @param l The callback that will run 3945 * 3946 * @see #setLongClickable(boolean) 3947 */ 3948 public void setOnLongClickListener(OnLongClickListener l) { 3949 if (!isLongClickable()) { 3950 setLongClickable(true); 3951 } 3952 getListenerInfo().mOnLongClickListener = l; 3953 } 3954 3955 /** 3956 * Register a callback to be invoked when the context menu for this view is 3957 * being built. If this view is not long clickable, it becomes long clickable. 3958 * 3959 * @param l The callback that will run 3960 * 3961 */ 3962 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3963 if (!isLongClickable()) { 3964 setLongClickable(true); 3965 } 3966 getListenerInfo().mOnCreateContextMenuListener = l; 3967 } 3968 3969 /** 3970 * Call this view's OnClickListener, if it is defined. Performs all normal 3971 * actions associated with clicking: reporting accessibility event, playing 3972 * a sound, etc. 3973 * 3974 * @return True there was an assigned OnClickListener that was called, false 3975 * otherwise is returned. 3976 */ 3977 public boolean performClick() { 3978 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3979 3980 ListenerInfo li = mListenerInfo; 3981 if (li != null && li.mOnClickListener != null) { 3982 playSoundEffect(SoundEffectConstants.CLICK); 3983 li.mOnClickListener.onClick(this); 3984 return true; 3985 } 3986 3987 return false; 3988 } 3989 3990 /** 3991 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3992 * this only calls the listener, and does not do any associated clicking 3993 * actions like reporting an accessibility event. 3994 * 3995 * @return True there was an assigned OnClickListener that was called, false 3996 * otherwise is returned. 3997 */ 3998 public boolean callOnClick() { 3999 ListenerInfo li = mListenerInfo; 4000 if (li != null && li.mOnClickListener != null) { 4001 li.mOnClickListener.onClick(this); 4002 return true; 4003 } 4004 return false; 4005 } 4006 4007 /** 4008 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4009 * OnLongClickListener did not consume the event. 4010 * 4011 * @return True if one of the above receivers consumed the event, false otherwise. 4012 */ 4013 public boolean performLongClick() { 4014 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4015 4016 boolean handled = false; 4017 ListenerInfo li = mListenerInfo; 4018 if (li != null && li.mOnLongClickListener != null) { 4019 handled = li.mOnLongClickListener.onLongClick(View.this); 4020 } 4021 if (!handled) { 4022 handled = showContextMenu(); 4023 } 4024 if (handled) { 4025 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4026 } 4027 return handled; 4028 } 4029 4030 /** 4031 * Performs button-related actions during a touch down event. 4032 * 4033 * @param event The event. 4034 * @return True if the down was consumed. 4035 * 4036 * @hide 4037 */ 4038 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4039 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4040 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4041 return true; 4042 } 4043 } 4044 return false; 4045 } 4046 4047 /** 4048 * Bring up the context menu for this view. 4049 * 4050 * @return Whether a context menu was displayed. 4051 */ 4052 public boolean showContextMenu() { 4053 return getParent().showContextMenuForChild(this); 4054 } 4055 4056 /** 4057 * Bring up the context menu for this view, referring to the item under the specified point. 4058 * 4059 * @param x The referenced x coordinate. 4060 * @param y The referenced y coordinate. 4061 * @param metaState The keyboard modifiers that were pressed. 4062 * @return Whether a context menu was displayed. 4063 * 4064 * @hide 4065 */ 4066 public boolean showContextMenu(float x, float y, int metaState) { 4067 return showContextMenu(); 4068 } 4069 4070 /** 4071 * Start an action mode. 4072 * 4073 * @param callback Callback that will control the lifecycle of the action mode 4074 * @return The new action mode if it is started, null otherwise 4075 * 4076 * @see ActionMode 4077 */ 4078 public ActionMode startActionMode(ActionMode.Callback callback) { 4079 ViewParent parent = getParent(); 4080 if (parent == null) return null; 4081 return parent.startActionModeForChild(this, callback); 4082 } 4083 4084 /** 4085 * Register a callback to be invoked when a key is pressed in this view. 4086 * @param l the key listener to attach to this view 4087 */ 4088 public void setOnKeyListener(OnKeyListener l) { 4089 getListenerInfo().mOnKeyListener = l; 4090 } 4091 4092 /** 4093 * Register a callback to be invoked when a touch event is sent to this view. 4094 * @param l the touch listener to attach to this view 4095 */ 4096 public void setOnTouchListener(OnTouchListener l) { 4097 getListenerInfo().mOnTouchListener = l; 4098 } 4099 4100 /** 4101 * Register a callback to be invoked when a generic motion event is sent to this view. 4102 * @param l the generic motion listener to attach to this view 4103 */ 4104 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4105 getListenerInfo().mOnGenericMotionListener = l; 4106 } 4107 4108 /** 4109 * Register a callback to be invoked when a hover event is sent to this view. 4110 * @param l the hover listener to attach to this view 4111 */ 4112 public void setOnHoverListener(OnHoverListener l) { 4113 getListenerInfo().mOnHoverListener = l; 4114 } 4115 4116 /** 4117 * Register a drag event listener callback object for this View. The parameter is 4118 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4119 * View, the system calls the 4120 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4121 * @param l An implementation of {@link android.view.View.OnDragListener}. 4122 */ 4123 public void setOnDragListener(OnDragListener l) { 4124 getListenerInfo().mOnDragListener = l; 4125 } 4126 4127 /** 4128 * Give this view focus. This will cause 4129 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4130 * 4131 * Note: this does not check whether this {@link View} should get focus, it just 4132 * gives it focus no matter what. It should only be called internally by framework 4133 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4134 * 4135 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4136 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4137 * focus moved when requestFocus() is called. It may not always 4138 * apply, in which case use the default View.FOCUS_DOWN. 4139 * @param previouslyFocusedRect The rectangle of the view that had focus 4140 * prior in this View's coordinate system. 4141 */ 4142 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4143 if (DBG) { 4144 System.out.println(this + " requestFocus()"); 4145 } 4146 4147 if ((mPrivateFlags & FOCUSED) == 0) { 4148 mPrivateFlags |= FOCUSED; 4149 4150 if (mParent != null) { 4151 mParent.requestChildFocus(this, this); 4152 } 4153 4154 onFocusChanged(true, direction, previouslyFocusedRect); 4155 refreshDrawableState(); 4156 4157 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4158 notifyAccessibilityStateChanged(); 4159 } 4160 } 4161 } 4162 4163 /** 4164 * Request that a rectangle of this view be visible on the screen, 4165 * scrolling if necessary just enough. 4166 * 4167 * <p>A View should call this if it maintains some notion of which part 4168 * of its content is interesting. For example, a text editing view 4169 * should call this when its cursor moves. 4170 * 4171 * @param rectangle The rectangle. 4172 * @return Whether any parent scrolled. 4173 */ 4174 public boolean requestRectangleOnScreen(Rect rectangle) { 4175 return requestRectangleOnScreen(rectangle, false); 4176 } 4177 4178 /** 4179 * Request that a rectangle of this view be visible on the screen, 4180 * scrolling if necessary just enough. 4181 * 4182 * <p>A View should call this if it maintains some notion of which part 4183 * of its content is interesting. For example, a text editing view 4184 * should call this when its cursor moves. 4185 * 4186 * <p>When <code>immediate</code> is set to true, scrolling will not be 4187 * animated. 4188 * 4189 * @param rectangle The rectangle. 4190 * @param immediate True to forbid animated scrolling, false otherwise 4191 * @return Whether any parent scrolled. 4192 */ 4193 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4194 View child = this; 4195 ViewParent parent = mParent; 4196 boolean scrolled = false; 4197 while (parent != null) { 4198 scrolled |= parent.requestChildRectangleOnScreen(child, 4199 rectangle, immediate); 4200 4201 // offset rect so next call has the rectangle in the 4202 // coordinate system of its direct child. 4203 rectangle.offset(child.getLeft(), child.getTop()); 4204 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4205 4206 if (!(parent instanceof View)) { 4207 break; 4208 } 4209 4210 child = (View) parent; 4211 parent = child.getParent(); 4212 } 4213 return scrolled; 4214 } 4215 4216 /** 4217 * Called when this view wants to give up focus. If focus is cleared 4218 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4219 * <p> 4220 * <strong>Note:</strong> When a View clears focus the framework is trying 4221 * to give focus to the first focusable View from the top. Hence, if this 4222 * View is the first from the top that can take focus, then all callbacks 4223 * related to clearing focus will be invoked after wich the framework will 4224 * give focus to this view. 4225 * </p> 4226 */ 4227 public void clearFocus() { 4228 if (DBG) { 4229 System.out.println(this + " clearFocus()"); 4230 } 4231 4232 if ((mPrivateFlags & FOCUSED) != 0) { 4233 mPrivateFlags &= ~FOCUSED; 4234 4235 if (mParent != null) { 4236 mParent.clearChildFocus(this); 4237 } 4238 4239 onFocusChanged(false, 0, null); 4240 4241 refreshDrawableState(); 4242 4243 ensureInputFocusOnFirstFocusable(); 4244 4245 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4246 notifyAccessibilityStateChanged(); 4247 } 4248 } 4249 } 4250 4251 void ensureInputFocusOnFirstFocusable() { 4252 View root = getRootView(); 4253 if (root != null) { 4254 root.requestFocus(); 4255 } 4256 } 4257 4258 /** 4259 * Called internally by the view system when a new view is getting focus. 4260 * This is what clears the old focus. 4261 */ 4262 void unFocus() { 4263 if (DBG) { 4264 System.out.println(this + " unFocus()"); 4265 } 4266 4267 if ((mPrivateFlags & FOCUSED) != 0) { 4268 mPrivateFlags &= ~FOCUSED; 4269 4270 onFocusChanged(false, 0, null); 4271 refreshDrawableState(); 4272 4273 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4274 notifyAccessibilityStateChanged(); 4275 } 4276 } 4277 } 4278 4279 /** 4280 * Returns true if this view has focus iteself, or is the ancestor of the 4281 * view that has focus. 4282 * 4283 * @return True if this view has or contains focus, false otherwise. 4284 */ 4285 @ViewDebug.ExportedProperty(category = "focus") 4286 public boolean hasFocus() { 4287 return (mPrivateFlags & FOCUSED) != 0; 4288 } 4289 4290 /** 4291 * Returns true if this view is focusable or if it contains a reachable View 4292 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4293 * is a View whose parents do not block descendants focus. 4294 * 4295 * Only {@link #VISIBLE} views are considered focusable. 4296 * 4297 * @return True if the view is focusable or if the view contains a focusable 4298 * View, false otherwise. 4299 * 4300 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4301 */ 4302 public boolean hasFocusable() { 4303 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4304 } 4305 4306 /** 4307 * Called by the view system when the focus state of this view changes. 4308 * When the focus change event is caused by directional navigation, direction 4309 * and previouslyFocusedRect provide insight into where the focus is coming from. 4310 * When overriding, be sure to call up through to the super class so that 4311 * the standard focus handling will occur. 4312 * 4313 * @param gainFocus True if the View has focus; false otherwise. 4314 * @param direction The direction focus has moved when requestFocus() 4315 * is called to give this view focus. Values are 4316 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4317 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4318 * It may not always apply, in which case use the default. 4319 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4320 * system, of the previously focused view. If applicable, this will be 4321 * passed in as finer grained information about where the focus is coming 4322 * from (in addition to direction). Will be <code>null</code> otherwise. 4323 */ 4324 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4325 if (gainFocus) { 4326 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4327 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4328 requestAccessibilityFocus(); 4329 } 4330 } 4331 4332 InputMethodManager imm = InputMethodManager.peekInstance(); 4333 if (!gainFocus) { 4334 if (isPressed()) { 4335 setPressed(false); 4336 } 4337 if (imm != null && mAttachInfo != null 4338 && mAttachInfo.mHasWindowFocus) { 4339 imm.focusOut(this); 4340 } 4341 onFocusLost(); 4342 } else if (imm != null && mAttachInfo != null 4343 && mAttachInfo.mHasWindowFocus) { 4344 imm.focusIn(this); 4345 } 4346 4347 invalidate(true); 4348 ListenerInfo li = mListenerInfo; 4349 if (li != null && li.mOnFocusChangeListener != null) { 4350 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4351 } 4352 4353 if (mAttachInfo != null) { 4354 mAttachInfo.mKeyDispatchState.reset(this); 4355 } 4356 } 4357 4358 /** 4359 * Sends an accessibility event of the given type. If accessiiblity is 4360 * not enabled this method has no effect. The default implementation calls 4361 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4362 * to populate information about the event source (this View), then calls 4363 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4364 * populate the text content of the event source including its descendants, 4365 * and last calls 4366 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4367 * on its parent to resuest sending of the event to interested parties. 4368 * <p> 4369 * If an {@link AccessibilityDelegate} has been specified via calling 4370 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4371 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4372 * responsible for handling this call. 4373 * </p> 4374 * 4375 * @param eventType The type of the event to send, as defined by several types from 4376 * {@link android.view.accessibility.AccessibilityEvent}, such as 4377 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4378 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4379 * 4380 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4381 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4382 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4383 * @see AccessibilityDelegate 4384 */ 4385 public void sendAccessibilityEvent(int eventType) { 4386 if (mAccessibilityDelegate != null) { 4387 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4388 } else { 4389 sendAccessibilityEventInternal(eventType); 4390 } 4391 } 4392 4393 /** 4394 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4395 * {@link AccessibilityEvent} to make an announcement which is related to some 4396 * sort of a context change for which none of the events representing UI transitions 4397 * is a good fit. For example, announcing a new page in a book. If accessibility 4398 * is not enabled this method does nothing. 4399 * 4400 * @param text The announcement text. 4401 */ 4402 public void announceForAccessibility(CharSequence text) { 4403 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4404 AccessibilityEvent event = AccessibilityEvent.obtain( 4405 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4406 event.getText().add(text); 4407 sendAccessibilityEventUnchecked(event); 4408 } 4409 } 4410 4411 /** 4412 * @see #sendAccessibilityEvent(int) 4413 * 4414 * Note: Called from the default {@link AccessibilityDelegate}. 4415 */ 4416 void sendAccessibilityEventInternal(int eventType) { 4417 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4418 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4419 } 4420 } 4421 4422 /** 4423 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4424 * takes as an argument an empty {@link AccessibilityEvent} and does not 4425 * perform a check whether accessibility is enabled. 4426 * <p> 4427 * If an {@link AccessibilityDelegate} has been specified via calling 4428 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4429 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4430 * is responsible for handling this call. 4431 * </p> 4432 * 4433 * @param event The event to send. 4434 * 4435 * @see #sendAccessibilityEvent(int) 4436 */ 4437 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4438 if (mAccessibilityDelegate != null) { 4439 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4440 } else { 4441 sendAccessibilityEventUncheckedInternal(event); 4442 } 4443 } 4444 4445 /** 4446 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4447 * 4448 * Note: Called from the default {@link AccessibilityDelegate}. 4449 */ 4450 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4451 if (!isShown()) { 4452 return; 4453 } 4454 onInitializeAccessibilityEvent(event); 4455 // Only a subset of accessibility events populates text content. 4456 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4457 dispatchPopulateAccessibilityEvent(event); 4458 } 4459 // Intercept accessibility focus events fired by virtual nodes to keep 4460 // track of accessibility focus position in such nodes. 4461 final int eventType = event.getEventType(); 4462 switch (eventType) { 4463 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4464 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4465 event.getSourceNodeId()); 4466 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4467 ViewRootImpl viewRootImpl = getViewRootImpl(); 4468 if (viewRootImpl != null) { 4469 viewRootImpl.setAccessibilityFocusedHost(this); 4470 } 4471 } 4472 } break; 4473 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4474 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4475 event.getSourceNodeId()); 4476 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4477 ViewRootImpl viewRootImpl = getViewRootImpl(); 4478 if (viewRootImpl != null) { 4479 viewRootImpl.setAccessibilityFocusedHost(null); 4480 } 4481 } 4482 } break; 4483 } 4484 // In the beginning we called #isShown(), so we know that getParent() is not null. 4485 getParent().requestSendAccessibilityEvent(this, event); 4486 } 4487 4488 /** 4489 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4490 * to its children for adding their text content to the event. Note that the 4491 * event text is populated in a separate dispatch path since we add to the 4492 * event not only the text of the source but also the text of all its descendants. 4493 * A typical implementation will call 4494 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4495 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4496 * on each child. Override this method if custom population of the event text 4497 * content is required. 4498 * <p> 4499 * If an {@link AccessibilityDelegate} has been specified via calling 4500 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4501 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4502 * is responsible for handling this call. 4503 * </p> 4504 * <p> 4505 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4506 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4507 * </p> 4508 * 4509 * @param event The event. 4510 * 4511 * @return True if the event population was completed. 4512 */ 4513 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4514 if (mAccessibilityDelegate != null) { 4515 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4516 } else { 4517 return dispatchPopulateAccessibilityEventInternal(event); 4518 } 4519 } 4520 4521 /** 4522 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4523 * 4524 * Note: Called from the default {@link AccessibilityDelegate}. 4525 */ 4526 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4527 onPopulateAccessibilityEvent(event); 4528 return false; 4529 } 4530 4531 /** 4532 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4533 * giving a chance to this View to populate the accessibility event with its 4534 * text content. While this method is free to modify event 4535 * attributes other than text content, doing so should normally be performed in 4536 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4537 * <p> 4538 * Example: Adding formatted date string to an accessibility event in addition 4539 * to the text added by the super implementation: 4540 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4541 * super.onPopulateAccessibilityEvent(event); 4542 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4543 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4544 * mCurrentDate.getTimeInMillis(), flags); 4545 * event.getText().add(selectedDateUtterance); 4546 * }</pre> 4547 * <p> 4548 * If an {@link AccessibilityDelegate} has been specified via calling 4549 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4550 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4551 * is responsible for handling this call. 4552 * </p> 4553 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4554 * information to the event, in case the default implementation has basic information to add. 4555 * </p> 4556 * 4557 * @param event The accessibility event which to populate. 4558 * 4559 * @see #sendAccessibilityEvent(int) 4560 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4561 */ 4562 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4563 if (mAccessibilityDelegate != null) { 4564 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4565 } else { 4566 onPopulateAccessibilityEventInternal(event); 4567 } 4568 } 4569 4570 /** 4571 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4572 * 4573 * Note: Called from the default {@link AccessibilityDelegate}. 4574 */ 4575 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4576 4577 } 4578 4579 /** 4580 * Initializes an {@link AccessibilityEvent} with information about 4581 * this View which is the event source. In other words, the source of 4582 * an accessibility event is the view whose state change triggered firing 4583 * the event. 4584 * <p> 4585 * Example: Setting the password property of an event in addition 4586 * to properties set by the super implementation: 4587 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4588 * super.onInitializeAccessibilityEvent(event); 4589 * event.setPassword(true); 4590 * }</pre> 4591 * <p> 4592 * If an {@link AccessibilityDelegate} has been specified via calling 4593 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4594 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4595 * is responsible for handling this call. 4596 * </p> 4597 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4598 * information to the event, in case the default implementation has basic information to add. 4599 * </p> 4600 * @param event The event to initialize. 4601 * 4602 * @see #sendAccessibilityEvent(int) 4603 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4604 */ 4605 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4606 if (mAccessibilityDelegate != null) { 4607 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4608 } else { 4609 onInitializeAccessibilityEventInternal(event); 4610 } 4611 } 4612 4613 /** 4614 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4615 * 4616 * Note: Called from the default {@link AccessibilityDelegate}. 4617 */ 4618 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4619 event.setSource(this); 4620 event.setClassName(View.class.getName()); 4621 event.setPackageName(getContext().getPackageName()); 4622 event.setEnabled(isEnabled()); 4623 event.setContentDescription(mContentDescription); 4624 4625 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4626 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4627 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4628 FOCUSABLES_ALL); 4629 event.setItemCount(focusablesTempList.size()); 4630 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4631 focusablesTempList.clear(); 4632 } 4633 } 4634 4635 /** 4636 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4637 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4638 * This method is responsible for obtaining an accessibility node info from a 4639 * pool of reusable instances and calling 4640 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4641 * initialize the former. 4642 * <p> 4643 * Note: The client is responsible for recycling the obtained instance by calling 4644 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4645 * </p> 4646 * 4647 * @return A populated {@link AccessibilityNodeInfo}. 4648 * 4649 * @see AccessibilityNodeInfo 4650 */ 4651 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4652 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4653 if (provider != null) { 4654 return provider.createAccessibilityNodeInfo(View.NO_ID); 4655 } else { 4656 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4657 onInitializeAccessibilityNodeInfo(info); 4658 return info; 4659 } 4660 } 4661 4662 /** 4663 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4664 * The base implementation sets: 4665 * <ul> 4666 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4667 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4668 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4669 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4670 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4671 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4672 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4673 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4674 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4675 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4676 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4677 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4678 * </ul> 4679 * <p> 4680 * Subclasses should override this method, call the super implementation, 4681 * and set additional attributes. 4682 * </p> 4683 * <p> 4684 * If an {@link AccessibilityDelegate} has been specified via calling 4685 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4686 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4687 * is responsible for handling this call. 4688 * </p> 4689 * 4690 * @param info The instance to initialize. 4691 */ 4692 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4693 if (mAccessibilityDelegate != null) { 4694 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4695 } else { 4696 onInitializeAccessibilityNodeInfoInternal(info); 4697 } 4698 } 4699 4700 /** 4701 * Gets the location of this view in screen coordintates. 4702 * 4703 * @param outRect The output location 4704 */ 4705 private void getBoundsOnScreen(Rect outRect) { 4706 if (mAttachInfo == null) { 4707 return; 4708 } 4709 4710 RectF position = mAttachInfo.mTmpTransformRect; 4711 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4712 4713 if (!hasIdentityMatrix()) { 4714 getMatrix().mapRect(position); 4715 } 4716 4717 position.offset(mLeft, mTop); 4718 4719 ViewParent parent = mParent; 4720 while (parent instanceof View) { 4721 View parentView = (View) parent; 4722 4723 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4724 4725 if (!parentView.hasIdentityMatrix()) { 4726 parentView.getMatrix().mapRect(position); 4727 } 4728 4729 position.offset(parentView.mLeft, parentView.mTop); 4730 4731 parent = parentView.mParent; 4732 } 4733 4734 if (parent instanceof ViewRootImpl) { 4735 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4736 position.offset(0, -viewRootImpl.mCurScrollY); 4737 } 4738 4739 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4740 4741 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4742 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4743 } 4744 4745 /** 4746 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4747 * 4748 * Note: Called from the default {@link AccessibilityDelegate}. 4749 */ 4750 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4751 Rect bounds = mAttachInfo.mTmpInvalRect; 4752 getDrawingRect(bounds); 4753 info.setBoundsInParent(bounds); 4754 4755 getBoundsOnScreen(bounds); 4756 info.setBoundsInScreen(bounds); 4757 4758 ViewParent parent = getParentForAccessibility(); 4759 if (parent instanceof View) { 4760 info.setParent((View) parent); 4761 } 4762 4763 info.setVisibleToUser(isVisibleToUser()); 4764 4765 info.setPackageName(mContext.getPackageName()); 4766 info.setClassName(View.class.getName()); 4767 info.setContentDescription(getContentDescription()); 4768 4769 info.setEnabled(isEnabled()); 4770 info.setClickable(isClickable()); 4771 info.setFocusable(isFocusable()); 4772 info.setFocused(isFocused()); 4773 info.setAccessibilityFocused(isAccessibilityFocused()); 4774 info.setSelected(isSelected()); 4775 info.setLongClickable(isLongClickable()); 4776 4777 // TODO: These make sense only if we are in an AdapterView but all 4778 // views can be selected. Maybe from accessiiblity perspective 4779 // we should report as selectable view in an AdapterView. 4780 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4781 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4782 4783 if (isFocusable()) { 4784 if (isFocused()) { 4785 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4786 } else { 4787 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4788 } 4789 } 4790 4791 if (!isAccessibilityFocused()) { 4792 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4793 } else { 4794 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4795 } 4796 4797 if (isClickable()) { 4798 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4799 } 4800 4801 if (isLongClickable()) { 4802 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4803 } 4804 4805 if (mContentDescription != null && mContentDescription.length() > 0) { 4806 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4807 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4808 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4809 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4810 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4811 } 4812 } 4813 4814 /** 4815 * Computes whether this view is visible to the user. Such a view is 4816 * attached, visible, all its predecessors are visible, it is not clipped 4817 * entirely by its predecessors, and has an alpha greater than zero. 4818 * 4819 * @return Whether the view is visible on the screen. 4820 * 4821 * @hide 4822 */ 4823 protected boolean isVisibleToUser() { 4824 return isVisibleToUser(null); 4825 } 4826 4827 /** 4828 * Computes whether the given portion of this view is visible to the user. Such a view is 4829 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4830 * the specified portion is not clipped entirely by its predecessors. 4831 * 4832 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4833 * <code>null</code>, and the entire view will be tested in this case. 4834 * When <code>true</code> is returned by the function, the actual visible 4835 * region will be stored in this parameter; that is, if boundInView is fully 4836 * contained within the view, no modification will be made, otherwise regions 4837 * outside of the visible area of the view will be clipped. 4838 * 4839 * @return Whether the specified portion of the view is visible on the screen. 4840 * 4841 * @hide 4842 */ 4843 protected boolean isVisibleToUser(Rect boundInView) { 4844 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4845 Point offset = mAttachInfo.mPoint; 4846 // The first two checks are made also made by isShown() which 4847 // however traverses the tree up to the parent to catch that. 4848 // Therefore, we do some fail fast check to minimize the up 4849 // tree traversal. 4850 boolean isVisible = mAttachInfo != null 4851 && mAttachInfo.mWindowVisibility == View.VISIBLE 4852 && getAlpha() > 0 4853 && isShown() 4854 && getGlobalVisibleRect(visibleRect, offset); 4855 if (isVisible && boundInView != null) { 4856 visibleRect.offset(-offset.x, -offset.y); 4857 isVisible &= boundInView.intersect(visibleRect); 4858 } 4859 return isVisible; 4860 } 4861 4862 /** 4863 * Sets a delegate for implementing accessibility support via compositon as 4864 * opposed to inheritance. The delegate's primary use is for implementing 4865 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4866 * 4867 * @param delegate The delegate instance. 4868 * 4869 * @see AccessibilityDelegate 4870 */ 4871 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4872 mAccessibilityDelegate = delegate; 4873 } 4874 4875 /** 4876 * Gets the provider for managing a virtual view hierarchy rooted at this View 4877 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4878 * that explore the window content. 4879 * <p> 4880 * If this method returns an instance, this instance is responsible for managing 4881 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4882 * View including the one representing the View itself. Similarly the returned 4883 * instance is responsible for performing accessibility actions on any virtual 4884 * view or the root view itself. 4885 * </p> 4886 * <p> 4887 * If an {@link AccessibilityDelegate} has been specified via calling 4888 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4889 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4890 * is responsible for handling this call. 4891 * </p> 4892 * 4893 * @return The provider. 4894 * 4895 * @see AccessibilityNodeProvider 4896 */ 4897 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4898 if (mAccessibilityDelegate != null) { 4899 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4900 } else { 4901 return null; 4902 } 4903 } 4904 4905 /** 4906 * Gets the unique identifier of this view on the screen for accessibility purposes. 4907 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4908 * 4909 * @return The view accessibility id. 4910 * 4911 * @hide 4912 */ 4913 public int getAccessibilityViewId() { 4914 if (mAccessibilityViewId == NO_ID) { 4915 mAccessibilityViewId = sNextAccessibilityViewId++; 4916 } 4917 return mAccessibilityViewId; 4918 } 4919 4920 /** 4921 * Gets the unique identifier of the window in which this View reseides. 4922 * 4923 * @return The window accessibility id. 4924 * 4925 * @hide 4926 */ 4927 public int getAccessibilityWindowId() { 4928 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4929 } 4930 4931 /** 4932 * Gets the {@link View} description. It briefly describes the view and is 4933 * primarily used for accessibility support. Set this property to enable 4934 * better accessibility support for your application. This is especially 4935 * true for views that do not have textual representation (For example, 4936 * ImageButton). 4937 * 4938 * @return The content description. 4939 * 4940 * @attr ref android.R.styleable#View_contentDescription 4941 */ 4942 @ViewDebug.ExportedProperty(category = "accessibility") 4943 public CharSequence getContentDescription() { 4944 return mContentDescription; 4945 } 4946 4947 /** 4948 * Sets the {@link View} description. It briefly describes the view and is 4949 * primarily used for accessibility support. Set this property to enable 4950 * better accessibility support for your application. This is especially 4951 * true for views that do not have textual representation (For example, 4952 * ImageButton). 4953 * 4954 * @param contentDescription The content description. 4955 * 4956 * @attr ref android.R.styleable#View_contentDescription 4957 */ 4958 @RemotableViewMethod 4959 public void setContentDescription(CharSequence contentDescription) { 4960 mContentDescription = contentDescription; 4961 } 4962 4963 /** 4964 * Invoked whenever this view loses focus, either by losing window focus or by losing 4965 * focus within its window. This method can be used to clear any state tied to the 4966 * focus. For instance, if a button is held pressed with the trackball and the window 4967 * loses focus, this method can be used to cancel the press. 4968 * 4969 * Subclasses of View overriding this method should always call super.onFocusLost(). 4970 * 4971 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4972 * @see #onWindowFocusChanged(boolean) 4973 * 4974 * @hide pending API council approval 4975 */ 4976 protected void onFocusLost() { 4977 resetPressedState(); 4978 } 4979 4980 private void resetPressedState() { 4981 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4982 return; 4983 } 4984 4985 if (isPressed()) { 4986 setPressed(false); 4987 4988 if (!mHasPerformedLongPress) { 4989 removeLongPressCallback(); 4990 } 4991 } 4992 } 4993 4994 /** 4995 * Returns true if this view has focus 4996 * 4997 * @return True if this view has focus, false otherwise. 4998 */ 4999 @ViewDebug.ExportedProperty(category = "focus") 5000 public boolean isFocused() { 5001 return (mPrivateFlags & FOCUSED) != 0; 5002 } 5003 5004 /** 5005 * Find the view in the hierarchy rooted at this view that currently has 5006 * focus. 5007 * 5008 * @return The view that currently has focus, or null if no focused view can 5009 * be found. 5010 */ 5011 public View findFocus() { 5012 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 5013 } 5014 5015 /** 5016 * Indicates whether this view is one of the set of scrollable containers in 5017 * its window. 5018 * 5019 * @return whether this view is one of the set of scrollable containers in 5020 * its window 5021 * 5022 * @attr ref android.R.styleable#View_isScrollContainer 5023 */ 5024 public boolean isScrollContainer() { 5025 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5026 } 5027 5028 /** 5029 * Change whether this view is one of the set of scrollable containers in 5030 * its window. This will be used to determine whether the window can 5031 * resize or must pan when a soft input area is open -- scrollable 5032 * containers allow the window to use resize mode since the container 5033 * will appropriately shrink. 5034 * 5035 * @attr ref android.R.styleable#View_isScrollContainer 5036 */ 5037 public void setScrollContainer(boolean isScrollContainer) { 5038 if (isScrollContainer) { 5039 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5040 mAttachInfo.mScrollContainers.add(this); 5041 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5042 } 5043 mPrivateFlags |= SCROLL_CONTAINER; 5044 } else { 5045 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5046 mAttachInfo.mScrollContainers.remove(this); 5047 } 5048 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5049 } 5050 } 5051 5052 /** 5053 * Returns the quality of the drawing cache. 5054 * 5055 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5056 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5057 * 5058 * @see #setDrawingCacheQuality(int) 5059 * @see #setDrawingCacheEnabled(boolean) 5060 * @see #isDrawingCacheEnabled() 5061 * 5062 * @attr ref android.R.styleable#View_drawingCacheQuality 5063 */ 5064 public int getDrawingCacheQuality() { 5065 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5066 } 5067 5068 /** 5069 * Set the drawing cache quality of this view. This value is used only when the 5070 * drawing cache is enabled 5071 * 5072 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5073 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5074 * 5075 * @see #getDrawingCacheQuality() 5076 * @see #setDrawingCacheEnabled(boolean) 5077 * @see #isDrawingCacheEnabled() 5078 * 5079 * @attr ref android.R.styleable#View_drawingCacheQuality 5080 */ 5081 public void setDrawingCacheQuality(int quality) { 5082 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5083 } 5084 5085 /** 5086 * Returns whether the screen should remain on, corresponding to the current 5087 * value of {@link #KEEP_SCREEN_ON}. 5088 * 5089 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5090 * 5091 * @see #setKeepScreenOn(boolean) 5092 * 5093 * @attr ref android.R.styleable#View_keepScreenOn 5094 */ 5095 public boolean getKeepScreenOn() { 5096 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5097 } 5098 5099 /** 5100 * Controls whether the screen should remain on, modifying the 5101 * value of {@link #KEEP_SCREEN_ON}. 5102 * 5103 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5104 * 5105 * @see #getKeepScreenOn() 5106 * 5107 * @attr ref android.R.styleable#View_keepScreenOn 5108 */ 5109 public void setKeepScreenOn(boolean keepScreenOn) { 5110 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5111 } 5112 5113 /** 5114 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5115 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5116 * 5117 * @attr ref android.R.styleable#View_nextFocusLeft 5118 */ 5119 public int getNextFocusLeftId() { 5120 return mNextFocusLeftId; 5121 } 5122 5123 /** 5124 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5125 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5126 * decide automatically. 5127 * 5128 * @attr ref android.R.styleable#View_nextFocusLeft 5129 */ 5130 public void setNextFocusLeftId(int nextFocusLeftId) { 5131 mNextFocusLeftId = nextFocusLeftId; 5132 } 5133 5134 /** 5135 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5136 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5137 * 5138 * @attr ref android.R.styleable#View_nextFocusRight 5139 */ 5140 public int getNextFocusRightId() { 5141 return mNextFocusRightId; 5142 } 5143 5144 /** 5145 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5146 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5147 * decide automatically. 5148 * 5149 * @attr ref android.R.styleable#View_nextFocusRight 5150 */ 5151 public void setNextFocusRightId(int nextFocusRightId) { 5152 mNextFocusRightId = nextFocusRightId; 5153 } 5154 5155 /** 5156 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5157 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5158 * 5159 * @attr ref android.R.styleable#View_nextFocusUp 5160 */ 5161 public int getNextFocusUpId() { 5162 return mNextFocusUpId; 5163 } 5164 5165 /** 5166 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5167 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5168 * decide automatically. 5169 * 5170 * @attr ref android.R.styleable#View_nextFocusUp 5171 */ 5172 public void setNextFocusUpId(int nextFocusUpId) { 5173 mNextFocusUpId = nextFocusUpId; 5174 } 5175 5176 /** 5177 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5178 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5179 * 5180 * @attr ref android.R.styleable#View_nextFocusDown 5181 */ 5182 public int getNextFocusDownId() { 5183 return mNextFocusDownId; 5184 } 5185 5186 /** 5187 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5188 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5189 * decide automatically. 5190 * 5191 * @attr ref android.R.styleable#View_nextFocusDown 5192 */ 5193 public void setNextFocusDownId(int nextFocusDownId) { 5194 mNextFocusDownId = nextFocusDownId; 5195 } 5196 5197 /** 5198 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5199 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5200 * 5201 * @attr ref android.R.styleable#View_nextFocusForward 5202 */ 5203 public int getNextFocusForwardId() { 5204 return mNextFocusForwardId; 5205 } 5206 5207 /** 5208 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5209 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5210 * decide automatically. 5211 * 5212 * @attr ref android.R.styleable#View_nextFocusForward 5213 */ 5214 public void setNextFocusForwardId(int nextFocusForwardId) { 5215 mNextFocusForwardId = nextFocusForwardId; 5216 } 5217 5218 /** 5219 * Returns the visibility of this view and all of its ancestors 5220 * 5221 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5222 */ 5223 public boolean isShown() { 5224 View current = this; 5225 //noinspection ConstantConditions 5226 do { 5227 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5228 return false; 5229 } 5230 ViewParent parent = current.mParent; 5231 if (parent == null) { 5232 return false; // We are not attached to the view root 5233 } 5234 if (!(parent instanceof View)) { 5235 return true; 5236 } 5237 current = (View) parent; 5238 } while (current != null); 5239 5240 return false; 5241 } 5242 5243 /** 5244 * Called by the view hierarchy when the content insets for a window have 5245 * changed, to allow it to adjust its content to fit within those windows. 5246 * The content insets tell you the space that the status bar, input method, 5247 * and other system windows infringe on the application's window. 5248 * 5249 * <p>You do not normally need to deal with this function, since the default 5250 * window decoration given to applications takes care of applying it to the 5251 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5252 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5253 * and your content can be placed under those system elements. You can then 5254 * use this method within your view hierarchy if you have parts of your UI 5255 * which you would like to ensure are not being covered. 5256 * 5257 * <p>The default implementation of this method simply applies the content 5258 * inset's to the view's padding. This can be enabled through 5259 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5260 * the method and handle the insets however you would like. Note that the 5261 * insets provided by the framework are always relative to the far edges 5262 * of the window, not accounting for the location of the called view within 5263 * that window. (In fact when this method is called you do not yet know 5264 * where the layout will place the view, as it is done before layout happens.) 5265 * 5266 * <p>Note: unlike many View methods, there is no dispatch phase to this 5267 * call. If you are overriding it in a ViewGroup and want to allow the 5268 * call to continue to your children, you must be sure to call the super 5269 * implementation. 5270 * 5271 * <p>Here is a sample layout that makes use of fitting system windows 5272 * to have controls for a video view placed inside of the window decorations 5273 * that it hides and shows. This can be used with code like the second 5274 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5275 * 5276 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5277 * 5278 * @param insets Current content insets of the window. Prior to 5279 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5280 * the insets or else you and Android will be unhappy. 5281 * 5282 * @return Return true if this view applied the insets and it should not 5283 * continue propagating further down the hierarchy, false otherwise. 5284 */ 5285 protected boolean fitSystemWindows(Rect insets) { 5286 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5287 mUserPaddingStart = -1; 5288 mUserPaddingEnd = -1; 5289 mUserPaddingRelative = false; 5290 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5291 || mAttachInfo == null 5292 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5293 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5294 return true; 5295 } else { 5296 internalSetPadding(0, 0, 0, 0); 5297 return false; 5298 } 5299 } 5300 return false; 5301 } 5302 5303 /** 5304 * Set whether or not this view should account for system screen decorations 5305 * such as the status bar and inset its content. This allows this view to be 5306 * positioned in absolute screen coordinates and remain visible to the user. 5307 * 5308 * <p>This should only be used by top-level window decor views. 5309 * 5310 * @param fitSystemWindows true to inset content for system screen decorations, false for 5311 * default behavior. 5312 * 5313 * @attr ref android.R.styleable#View_fitsSystemWindows 5314 */ 5315 public void setFitsSystemWindows(boolean fitSystemWindows) { 5316 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5317 } 5318 5319 /** 5320 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5321 * returns true, this view 5322 * will account for system screen decorations such as the status bar and inset its 5323 * content. This allows the view to be positioned in absolute screen coordinates 5324 * and remain visible to the user. 5325 * 5326 * @return true if this view will adjust its content bounds for system screen decorations. 5327 * 5328 * @attr ref android.R.styleable#View_fitsSystemWindows 5329 */ 5330 public boolean getFitsSystemWindows() { 5331 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5332 } 5333 5334 /** @hide */ 5335 public boolean fitsSystemWindows() { 5336 return getFitsSystemWindows(); 5337 } 5338 5339 /** 5340 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5341 */ 5342 public void requestFitSystemWindows() { 5343 if (mParent != null) { 5344 mParent.requestFitSystemWindows(); 5345 } 5346 } 5347 5348 /** 5349 * For use by PhoneWindow to make its own system window fitting optional. 5350 * @hide 5351 */ 5352 public void makeOptionalFitsSystemWindows() { 5353 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5354 } 5355 5356 /** 5357 * Returns the visibility status for this view. 5358 * 5359 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5360 * @attr ref android.R.styleable#View_visibility 5361 */ 5362 @ViewDebug.ExportedProperty(mapping = { 5363 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5364 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5365 @ViewDebug.IntToString(from = GONE, to = "GONE") 5366 }) 5367 public int getVisibility() { 5368 return mViewFlags & VISIBILITY_MASK; 5369 } 5370 5371 /** 5372 * Set the enabled state of this view. 5373 * 5374 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5375 * @attr ref android.R.styleable#View_visibility 5376 */ 5377 @RemotableViewMethod 5378 public void setVisibility(int visibility) { 5379 setFlags(visibility, VISIBILITY_MASK); 5380 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5381 } 5382 5383 /** 5384 * Returns the enabled status for this view. The interpretation of the 5385 * enabled state varies by subclass. 5386 * 5387 * @return True if this view is enabled, false otherwise. 5388 */ 5389 @ViewDebug.ExportedProperty 5390 public boolean isEnabled() { 5391 return (mViewFlags & ENABLED_MASK) == ENABLED; 5392 } 5393 5394 /** 5395 * Set the enabled state of this view. The interpretation of the enabled 5396 * state varies by subclass. 5397 * 5398 * @param enabled True if this view is enabled, false otherwise. 5399 */ 5400 @RemotableViewMethod 5401 public void setEnabled(boolean enabled) { 5402 if (enabled == isEnabled()) return; 5403 5404 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5405 5406 /* 5407 * The View most likely has to change its appearance, so refresh 5408 * the drawable state. 5409 */ 5410 refreshDrawableState(); 5411 5412 // Invalidate too, since the default behavior for views is to be 5413 // be drawn at 50% alpha rather than to change the drawable. 5414 invalidate(true); 5415 } 5416 5417 /** 5418 * Set whether this view can receive the focus. 5419 * 5420 * Setting this to false will also ensure that this view is not focusable 5421 * in touch mode. 5422 * 5423 * @param focusable If true, this view can receive the focus. 5424 * 5425 * @see #setFocusableInTouchMode(boolean) 5426 * @attr ref android.R.styleable#View_focusable 5427 */ 5428 public void setFocusable(boolean focusable) { 5429 if (!focusable) { 5430 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5431 } 5432 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5433 } 5434 5435 /** 5436 * Set whether this view can receive focus while in touch mode. 5437 * 5438 * Setting this to true will also ensure that this view is focusable. 5439 * 5440 * @param focusableInTouchMode If true, this view can receive the focus while 5441 * in touch mode. 5442 * 5443 * @see #setFocusable(boolean) 5444 * @attr ref android.R.styleable#View_focusableInTouchMode 5445 */ 5446 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5447 // Focusable in touch mode should always be set before the focusable flag 5448 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5449 // which, in touch mode, will not successfully request focus on this view 5450 // because the focusable in touch mode flag is not set 5451 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5452 if (focusableInTouchMode) { 5453 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5454 } 5455 } 5456 5457 /** 5458 * Set whether this view should have sound effects enabled for events such as 5459 * clicking and touching. 5460 * 5461 * <p>You may wish to disable sound effects for a view if you already play sounds, 5462 * for instance, a dial key that plays dtmf tones. 5463 * 5464 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5465 * @see #isSoundEffectsEnabled() 5466 * @see #playSoundEffect(int) 5467 * @attr ref android.R.styleable#View_soundEffectsEnabled 5468 */ 5469 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5470 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5471 } 5472 5473 /** 5474 * @return whether this view should have sound effects enabled for events such as 5475 * clicking and touching. 5476 * 5477 * @see #setSoundEffectsEnabled(boolean) 5478 * @see #playSoundEffect(int) 5479 * @attr ref android.R.styleable#View_soundEffectsEnabled 5480 */ 5481 @ViewDebug.ExportedProperty 5482 public boolean isSoundEffectsEnabled() { 5483 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5484 } 5485 5486 /** 5487 * Set whether this view should have haptic feedback for events such as 5488 * long presses. 5489 * 5490 * <p>You may wish to disable haptic feedback if your view already controls 5491 * its own haptic feedback. 5492 * 5493 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5494 * @see #isHapticFeedbackEnabled() 5495 * @see #performHapticFeedback(int) 5496 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5497 */ 5498 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5499 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5500 } 5501 5502 /** 5503 * @return whether this view should have haptic feedback enabled for events 5504 * long presses. 5505 * 5506 * @see #setHapticFeedbackEnabled(boolean) 5507 * @see #performHapticFeedback(int) 5508 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5509 */ 5510 @ViewDebug.ExportedProperty 5511 public boolean isHapticFeedbackEnabled() { 5512 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5513 } 5514 5515 /** 5516 * Returns the layout direction for this view. 5517 * 5518 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5519 * {@link #LAYOUT_DIRECTION_RTL}, 5520 * {@link #LAYOUT_DIRECTION_INHERIT} or 5521 * {@link #LAYOUT_DIRECTION_LOCALE}. 5522 * 5523 * @attr ref android.R.styleable#View_layoutDirection 5524 * @hide 5525 */ 5526 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5527 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5528 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5529 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5530 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5531 }) 5532 public int getLayoutDirection() { 5533 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5534 } 5535 5536 /** 5537 * Set the layout direction for this view. This will propagate a reset of layout direction 5538 * resolution to the view's children and resolve layout direction for this view. 5539 * 5540 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5541 * {@link #LAYOUT_DIRECTION_RTL}, 5542 * {@link #LAYOUT_DIRECTION_INHERIT} or 5543 * {@link #LAYOUT_DIRECTION_LOCALE}. 5544 * 5545 * @attr ref android.R.styleable#View_layoutDirection 5546 * @hide 5547 */ 5548 @RemotableViewMethod 5549 public void setLayoutDirection(int layoutDirection) { 5550 if (getLayoutDirection() != layoutDirection) { 5551 // Reset the current layout direction and the resolved one 5552 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5553 resetResolvedLayoutDirection(); 5554 // Set the new layout direction (filtered) and ask for a layout pass 5555 mPrivateFlags2 |= 5556 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5557 requestLayout(); 5558 } 5559 } 5560 5561 /** 5562 * Returns the resolved layout direction for this view. 5563 * 5564 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5565 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5566 * @hide 5567 */ 5568 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5569 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5570 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5571 }) 5572 public int getResolvedLayoutDirection() { 5573 // The layout diretion will be resolved only if needed 5574 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5575 resolveLayoutDirection(); 5576 } 5577 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5578 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5579 } 5580 5581 /** 5582 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5583 * layout attribute and/or the inherited value from the parent 5584 * 5585 * @return true if the layout is right-to-left. 5586 * @hide 5587 */ 5588 @ViewDebug.ExportedProperty(category = "layout") 5589 public boolean isLayoutRtl() { 5590 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5591 } 5592 5593 /** 5594 * Indicates whether the view is currently tracking transient state that the 5595 * app should not need to concern itself with saving and restoring, but that 5596 * the framework should take special note to preserve when possible. 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 * @return true if the view has transient state 5604 */ 5605 @ViewDebug.ExportedProperty(category = "layout") 5606 public boolean hasTransientState() { 5607 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5608 } 5609 5610 /** 5611 * Set whether this view is currently tracking transient state that the 5612 * framework should attempt to preserve when possible. This flag is reference counted, 5613 * so every call to setHasTransientState(true) should be paired with a later call 5614 * to setHasTransientState(false). 5615 * 5616 * <p>A view with transient state cannot be trivially rebound from an external 5617 * data source, such as an adapter binding item views in a list. This may be 5618 * because the view is performing an animation, tracking user selection 5619 * of content, or similar.</p> 5620 * 5621 * @param hasTransientState true if this view has transient state 5622 */ 5623 public void setHasTransientState(boolean hasTransientState) { 5624 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5625 mTransientStateCount - 1; 5626 if (mTransientStateCount < 0) { 5627 mTransientStateCount = 0; 5628 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5629 "unmatched pair of setHasTransientState calls"); 5630 } 5631 if ((hasTransientState && mTransientStateCount == 1) || 5632 (!hasTransientState && mTransientStateCount == 0)) { 5633 // update flag if we've just incremented up from 0 or decremented down to 0 5634 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5635 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5636 if (mParent != null) { 5637 try { 5638 mParent.childHasTransientStateChanged(this, hasTransientState); 5639 } catch (AbstractMethodError e) { 5640 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5641 " does not fully implement ViewParent", e); 5642 } 5643 } 5644 } 5645 } 5646 5647 /** 5648 * If this view doesn't do any drawing on its own, set this flag to 5649 * allow further optimizations. By default, this flag is not set on 5650 * View, but could be set on some View subclasses such as ViewGroup. 5651 * 5652 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5653 * you should clear this flag. 5654 * 5655 * @param willNotDraw whether or not this View draw on its own 5656 */ 5657 public void setWillNotDraw(boolean willNotDraw) { 5658 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5659 } 5660 5661 /** 5662 * Returns whether or not this View draws on its own. 5663 * 5664 * @return true if this view has nothing to draw, false otherwise 5665 */ 5666 @ViewDebug.ExportedProperty(category = "drawing") 5667 public boolean willNotDraw() { 5668 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5669 } 5670 5671 /** 5672 * When a View's drawing cache is enabled, drawing is redirected to an 5673 * offscreen bitmap. Some views, like an ImageView, must be able to 5674 * bypass this mechanism if they already draw a single bitmap, to avoid 5675 * unnecessary usage of the memory. 5676 * 5677 * @param willNotCacheDrawing true if this view does not cache its 5678 * drawing, false otherwise 5679 */ 5680 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5681 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5682 } 5683 5684 /** 5685 * Returns whether or not this View can cache its drawing or not. 5686 * 5687 * @return true if this view does not cache its drawing, false otherwise 5688 */ 5689 @ViewDebug.ExportedProperty(category = "drawing") 5690 public boolean willNotCacheDrawing() { 5691 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5692 } 5693 5694 /** 5695 * Indicates whether this view reacts to click events or not. 5696 * 5697 * @return true if the view is clickable, false otherwise 5698 * 5699 * @see #setClickable(boolean) 5700 * @attr ref android.R.styleable#View_clickable 5701 */ 5702 @ViewDebug.ExportedProperty 5703 public boolean isClickable() { 5704 return (mViewFlags & CLICKABLE) == CLICKABLE; 5705 } 5706 5707 /** 5708 * Enables or disables click events for this view. When a view 5709 * is clickable it will change its state to "pressed" on every click. 5710 * Subclasses should set the view clickable to visually react to 5711 * user's clicks. 5712 * 5713 * @param clickable true to make the view clickable, false otherwise 5714 * 5715 * @see #isClickable() 5716 * @attr ref android.R.styleable#View_clickable 5717 */ 5718 public void setClickable(boolean clickable) { 5719 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5720 } 5721 5722 /** 5723 * Indicates whether this view reacts to long click events or not. 5724 * 5725 * @return true if the view is long clickable, false otherwise 5726 * 5727 * @see #setLongClickable(boolean) 5728 * @attr ref android.R.styleable#View_longClickable 5729 */ 5730 public boolean isLongClickable() { 5731 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5732 } 5733 5734 /** 5735 * Enables or disables long click events for this view. When a view is long 5736 * clickable it reacts to the user holding down the button for a longer 5737 * duration than a tap. This event can either launch the listener or a 5738 * context menu. 5739 * 5740 * @param longClickable true to make the view long clickable, false otherwise 5741 * @see #isLongClickable() 5742 * @attr ref android.R.styleable#View_longClickable 5743 */ 5744 public void setLongClickable(boolean longClickable) { 5745 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5746 } 5747 5748 /** 5749 * Sets the pressed state for this view. 5750 * 5751 * @see #isClickable() 5752 * @see #setClickable(boolean) 5753 * 5754 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5755 * the View's internal state from a previously set "pressed" state. 5756 */ 5757 public void setPressed(boolean pressed) { 5758 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5759 5760 if (pressed) { 5761 mPrivateFlags |= PRESSED; 5762 } else { 5763 mPrivateFlags &= ~PRESSED; 5764 } 5765 5766 if (needsRefresh) { 5767 refreshDrawableState(); 5768 } 5769 dispatchSetPressed(pressed); 5770 } 5771 5772 /** 5773 * Dispatch setPressed to all of this View's children. 5774 * 5775 * @see #setPressed(boolean) 5776 * 5777 * @param pressed The new pressed state 5778 */ 5779 protected void dispatchSetPressed(boolean pressed) { 5780 } 5781 5782 /** 5783 * Indicates whether the view is currently in pressed state. Unless 5784 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5785 * the pressed state. 5786 * 5787 * @see #setPressed(boolean) 5788 * @see #isClickable() 5789 * @see #setClickable(boolean) 5790 * 5791 * @return true if the view is currently pressed, false otherwise 5792 */ 5793 public boolean isPressed() { 5794 return (mPrivateFlags & PRESSED) == PRESSED; 5795 } 5796 5797 /** 5798 * Indicates whether this view will save its state (that is, 5799 * whether its {@link #onSaveInstanceState} method will be called). 5800 * 5801 * @return Returns true if the view state saving is enabled, else false. 5802 * 5803 * @see #setSaveEnabled(boolean) 5804 * @attr ref android.R.styleable#View_saveEnabled 5805 */ 5806 public boolean isSaveEnabled() { 5807 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5808 } 5809 5810 /** 5811 * Controls whether the saving of this view's state is 5812 * enabled (that is, whether its {@link #onSaveInstanceState} method 5813 * will be called). Note that even if freezing is enabled, the 5814 * view still must have an id assigned to it (via {@link #setId(int)}) 5815 * for its state to be saved. This flag can only disable the 5816 * saving of this view; any child views may still have their state saved. 5817 * 5818 * @param enabled Set to false to <em>disable</em> state saving, or true 5819 * (the default) to allow it. 5820 * 5821 * @see #isSaveEnabled() 5822 * @see #setId(int) 5823 * @see #onSaveInstanceState() 5824 * @attr ref android.R.styleable#View_saveEnabled 5825 */ 5826 public void setSaveEnabled(boolean enabled) { 5827 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5828 } 5829 5830 /** 5831 * Gets whether the framework should discard touches when the view's 5832 * window is obscured by another visible window. 5833 * Refer to the {@link View} security documentation for more details. 5834 * 5835 * @return True if touch filtering is enabled. 5836 * 5837 * @see #setFilterTouchesWhenObscured(boolean) 5838 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5839 */ 5840 @ViewDebug.ExportedProperty 5841 public boolean getFilterTouchesWhenObscured() { 5842 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5843 } 5844 5845 /** 5846 * Sets whether the framework should discard touches when the view's 5847 * window is obscured by another visible window. 5848 * Refer to the {@link View} security documentation for more details. 5849 * 5850 * @param enabled True if touch filtering should be enabled. 5851 * 5852 * @see #getFilterTouchesWhenObscured 5853 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5854 */ 5855 public void setFilterTouchesWhenObscured(boolean enabled) { 5856 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5857 FILTER_TOUCHES_WHEN_OBSCURED); 5858 } 5859 5860 /** 5861 * Indicates whether the entire hierarchy under this view will save its 5862 * state when a state saving traversal occurs from its parent. The default 5863 * is true; if false, these views will not be saved unless 5864 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5865 * 5866 * @return Returns true if the view state saving from parent is enabled, else false. 5867 * 5868 * @see #setSaveFromParentEnabled(boolean) 5869 */ 5870 public boolean isSaveFromParentEnabled() { 5871 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5872 } 5873 5874 /** 5875 * Controls whether the entire hierarchy under this view will save its 5876 * state when a state saving traversal occurs from its parent. The default 5877 * is true; if false, these views will not be saved unless 5878 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5879 * 5880 * @param enabled Set to false to <em>disable</em> state saving, or true 5881 * (the default) to allow it. 5882 * 5883 * @see #isSaveFromParentEnabled() 5884 * @see #setId(int) 5885 * @see #onSaveInstanceState() 5886 */ 5887 public void setSaveFromParentEnabled(boolean enabled) { 5888 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5889 } 5890 5891 5892 /** 5893 * Returns whether this View is able to take focus. 5894 * 5895 * @return True if this view can take focus, or false otherwise. 5896 * @attr ref android.R.styleable#View_focusable 5897 */ 5898 @ViewDebug.ExportedProperty(category = "focus") 5899 public final boolean isFocusable() { 5900 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5901 } 5902 5903 /** 5904 * When a view is focusable, it may not want to take focus when in touch mode. 5905 * For example, a button would like focus when the user is navigating via a D-pad 5906 * so that the user can click on it, but once the user starts touching the screen, 5907 * the button shouldn't take focus 5908 * @return Whether the view is focusable in touch mode. 5909 * @attr ref android.R.styleable#View_focusableInTouchMode 5910 */ 5911 @ViewDebug.ExportedProperty 5912 public final boolean isFocusableInTouchMode() { 5913 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5914 } 5915 5916 /** 5917 * Find the nearest view in the specified direction that can take focus. 5918 * This does not actually give focus to that view. 5919 * 5920 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5921 * 5922 * @return The nearest focusable in the specified direction, or null if none 5923 * can be found. 5924 */ 5925 public View focusSearch(int direction) { 5926 if (mParent != null) { 5927 return mParent.focusSearch(this, direction); 5928 } else { 5929 return null; 5930 } 5931 } 5932 5933 /** 5934 * This method is the last chance for the focused view and its ancestors to 5935 * respond to an arrow key. This is called when the focused view did not 5936 * consume the key internally, nor could the view system find a new view in 5937 * the requested direction to give focus to. 5938 * 5939 * @param focused The currently focused view. 5940 * @param direction The direction focus wants to move. One of FOCUS_UP, 5941 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5942 * @return True if the this view consumed this unhandled move. 5943 */ 5944 public boolean dispatchUnhandledMove(View focused, int direction) { 5945 return false; 5946 } 5947 5948 /** 5949 * If a user manually specified the next view id for a particular direction, 5950 * use the root to look up the view. 5951 * @param root The root view of the hierarchy containing this view. 5952 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5953 * or FOCUS_BACKWARD. 5954 * @return The user specified next view, or null if there is none. 5955 */ 5956 View findUserSetNextFocus(View root, int direction) { 5957 switch (direction) { 5958 case FOCUS_LEFT: 5959 if (mNextFocusLeftId == View.NO_ID) return null; 5960 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5961 case FOCUS_RIGHT: 5962 if (mNextFocusRightId == View.NO_ID) return null; 5963 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5964 case FOCUS_UP: 5965 if (mNextFocusUpId == View.NO_ID) return null; 5966 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5967 case FOCUS_DOWN: 5968 if (mNextFocusDownId == View.NO_ID) return null; 5969 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5970 case FOCUS_FORWARD: 5971 if (mNextFocusForwardId == View.NO_ID) return null; 5972 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5973 case FOCUS_BACKWARD: { 5974 if (mID == View.NO_ID) return null; 5975 final int id = mID; 5976 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5977 @Override 5978 public boolean apply(View t) { 5979 return t.mNextFocusForwardId == id; 5980 } 5981 }); 5982 } 5983 } 5984 return null; 5985 } 5986 5987 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5988 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5989 @Override 5990 public boolean apply(View t) { 5991 return t.mID == childViewId; 5992 } 5993 }); 5994 5995 if (result == null) { 5996 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5997 + "by user for id " + childViewId); 5998 } 5999 return result; 6000 } 6001 6002 /** 6003 * Find and return all focusable views that are descendants of this view, 6004 * possibly including this view if it is focusable itself. 6005 * 6006 * @param direction The direction of the focus 6007 * @return A list of focusable views 6008 */ 6009 public ArrayList<View> getFocusables(int direction) { 6010 ArrayList<View> result = new ArrayList<View>(24); 6011 addFocusables(result, direction); 6012 return result; 6013 } 6014 6015 /** 6016 * Add any focusable views that are descendants of this view (possibly 6017 * including this view if it is focusable itself) to views. If we are in touch mode, 6018 * only add views that are also focusable in touch mode. 6019 * 6020 * @param views Focusable views found so far 6021 * @param direction The direction of the focus 6022 */ 6023 public void addFocusables(ArrayList<View> views, int direction) { 6024 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6025 } 6026 6027 /** 6028 * Adds any focusable views that are descendants of this view (possibly 6029 * including this view if it is focusable itself) to views. This method 6030 * adds all focusable views regardless if we are in touch mode or 6031 * only views focusable in touch mode if we are in touch mode or 6032 * only views that can take accessibility focus if accessibility is enabeld 6033 * depending on the focusable mode paramater. 6034 * 6035 * @param views Focusable views found so far or null if all we are interested is 6036 * the number of focusables. 6037 * @param direction The direction of the focus. 6038 * @param focusableMode The type of focusables to be added. 6039 * 6040 * @see #FOCUSABLES_ALL 6041 * @see #FOCUSABLES_TOUCH_MODE 6042 */ 6043 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6044 if (views == null) { 6045 return; 6046 } 6047 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6048 if (canTakeAccessibilityFocusFromHover() || getAccessibilityNodeProvider() != null) { 6049 views.add(this); 6050 return; 6051 } 6052 } 6053 if (!isFocusable()) { 6054 return; 6055 } 6056 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6057 && isInTouchMode() && !isFocusableInTouchMode()) { 6058 return; 6059 } 6060 views.add(this); 6061 } 6062 6063 /** 6064 * Finds the Views that contain given text. The containment is case insensitive. 6065 * The search is performed by either the text that the View renders or the content 6066 * description that describes the view for accessibility purposes and the view does 6067 * not render or both. Clients can specify how the search is to be performed via 6068 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6069 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6070 * 6071 * @param outViews The output list of matching Views. 6072 * @param searched The text to match against. 6073 * 6074 * @see #FIND_VIEWS_WITH_TEXT 6075 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6076 * @see #setContentDescription(CharSequence) 6077 */ 6078 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6079 if (getAccessibilityNodeProvider() != null) { 6080 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6081 outViews.add(this); 6082 } 6083 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6084 && (searched != null && searched.length() > 0) 6085 && (mContentDescription != null && mContentDescription.length() > 0)) { 6086 String searchedLowerCase = searched.toString().toLowerCase(); 6087 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6088 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6089 outViews.add(this); 6090 } 6091 } 6092 } 6093 6094 /** 6095 * Find and return all touchable views that are descendants of this view, 6096 * possibly including this view if it is touchable itself. 6097 * 6098 * @return A list of touchable views 6099 */ 6100 public ArrayList<View> getTouchables() { 6101 ArrayList<View> result = new ArrayList<View>(); 6102 addTouchables(result); 6103 return result; 6104 } 6105 6106 /** 6107 * Add any touchable views that are descendants of this view (possibly 6108 * including this view if it is touchable itself) to views. 6109 * 6110 * @param views Touchable views found so far 6111 */ 6112 public void addTouchables(ArrayList<View> views) { 6113 final int viewFlags = mViewFlags; 6114 6115 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6116 && (viewFlags & ENABLED_MASK) == ENABLED) { 6117 views.add(this); 6118 } 6119 } 6120 6121 /** 6122 * Returns whether this View is accessibility focused. 6123 * 6124 * @return True if this View is accessibility focused. 6125 */ 6126 boolean isAccessibilityFocused() { 6127 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6128 } 6129 6130 /** 6131 * Call this to try to give accessibility focus to this view. 6132 * 6133 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6134 * returns false or the view is no visible or the view already has accessibility 6135 * focus. 6136 * 6137 * See also {@link #focusSearch(int)}, which is what you call to say that you 6138 * have focus, and you want your parent to look for the next one. 6139 * 6140 * @return Whether this view actually took accessibility focus. 6141 * 6142 * @hide 6143 */ 6144 public boolean requestAccessibilityFocus() { 6145 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6146 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6147 return false; 6148 } 6149 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6150 return false; 6151 } 6152 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6153 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6154 ViewRootImpl viewRootImpl = getViewRootImpl(); 6155 if (viewRootImpl != null) { 6156 viewRootImpl.setAccessibilityFocusedHost(this); 6157 } 6158 invalidate(); 6159 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6160 notifyAccessibilityStateChanged(); 6161 // Try to give input focus to this view - not a descendant. 6162 requestFocusNoSearch(View.FOCUS_DOWN, null); 6163 return true; 6164 } 6165 return false; 6166 } 6167 6168 /** 6169 * Call this to try to clear accessibility focus of this view. 6170 * 6171 * See also {@link #focusSearch(int)}, which is what you call to say that you 6172 * have focus, and you want your parent to look for the next one. 6173 * 6174 * @hide 6175 */ 6176 public void clearAccessibilityFocus() { 6177 ViewRootImpl viewRootImpl = getViewRootImpl(); 6178 if (viewRootImpl != null) { 6179 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6180 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6181 viewRootImpl.setAccessibilityFocusedHost(null); 6182 } 6183 } 6184 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6185 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6186 invalidate(); 6187 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6188 notifyAccessibilityStateChanged(); 6189 6190 // Clear the text navigation state. 6191 setAccessibilityCursorPosition(-1); 6192 6193 // Try to move accessibility focus to the input focus. 6194 View rootView = getRootView(); 6195 if (rootView != null) { 6196 View inputFocus = rootView.findFocus(); 6197 if (inputFocus != null) { 6198 inputFocus.requestAccessibilityFocus(); 6199 } 6200 } 6201 } 6202 } 6203 6204 private void requestAccessibilityFocusFromHover() { 6205 if (includeForAccessibility() && isActionableForAccessibility()) { 6206 requestAccessibilityFocus(); 6207 } else { 6208 if (mParent != null) { 6209 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6210 if (nextFocus != null) { 6211 nextFocus.requestAccessibilityFocus(); 6212 } 6213 } 6214 } 6215 } 6216 6217 /** 6218 * @hide 6219 */ 6220 public boolean canTakeAccessibilityFocusFromHover() { 6221 if (includeForAccessibility() && isActionableForAccessibility()) { 6222 return true; 6223 } 6224 if (mParent != null) { 6225 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6226 } 6227 return false; 6228 } 6229 6230 /** 6231 * Clears accessibility focus without calling any callback methods 6232 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6233 * is used for clearing accessibility focus when giving this focus to 6234 * another view. 6235 */ 6236 void clearAccessibilityFocusNoCallbacks() { 6237 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6238 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6239 invalidate(); 6240 } 6241 } 6242 6243 /** 6244 * Call this to try to give focus to a specific view or to one of its 6245 * descendants. 6246 * 6247 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6248 * false), or if it is focusable and it is not focusable in touch mode 6249 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6250 * 6251 * See also {@link #focusSearch(int)}, which is what you call to say that you 6252 * have focus, and you want your parent to look for the next one. 6253 * 6254 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6255 * {@link #FOCUS_DOWN} and <code>null</code>. 6256 * 6257 * @return Whether this view or one of its descendants actually took focus. 6258 */ 6259 public final boolean requestFocus() { 6260 return requestFocus(View.FOCUS_DOWN); 6261 } 6262 6263 /** 6264 * Call this to try to give focus to a specific view or to one of its 6265 * descendants and give it a hint about what direction focus is heading. 6266 * 6267 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6268 * false), or if it is focusable and it is not focusable in touch mode 6269 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6270 * 6271 * See also {@link #focusSearch(int)}, which is what you call to say that you 6272 * have focus, and you want your parent to look for the next one. 6273 * 6274 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6275 * <code>null</code> set for the previously focused rectangle. 6276 * 6277 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6278 * @return Whether this view or one of its descendants actually took focus. 6279 */ 6280 public final boolean requestFocus(int direction) { 6281 return requestFocus(direction, null); 6282 } 6283 6284 /** 6285 * Call this to try to give focus to a specific view or to one of its descendants 6286 * and give it hints about the direction and a specific rectangle that the focus 6287 * is coming from. The rectangle can help give larger views a finer grained hint 6288 * about where focus is coming from, and therefore, where to show selection, or 6289 * forward focus change internally. 6290 * 6291 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6292 * false), or if it is focusable and it is not focusable in touch mode 6293 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6294 * 6295 * A View will not take focus if it is not visible. 6296 * 6297 * A View will not take focus if one of its parents has 6298 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6299 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6300 * 6301 * See also {@link #focusSearch(int)}, which is what you call to say that you 6302 * have focus, and you want your parent to look for the next one. 6303 * 6304 * You may wish to override this method if your custom {@link View} has an internal 6305 * {@link View} that it wishes to forward the request to. 6306 * 6307 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6308 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6309 * to give a finer grained hint about where focus is coming from. May be null 6310 * if there is no hint. 6311 * @return Whether this view or one of its descendants actually took focus. 6312 */ 6313 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6314 return requestFocusNoSearch(direction, previouslyFocusedRect); 6315 } 6316 6317 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6318 // need to be focusable 6319 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6320 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6321 return false; 6322 } 6323 6324 // need to be focusable in touch mode if in touch mode 6325 if (isInTouchMode() && 6326 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6327 return false; 6328 } 6329 6330 // need to not have any parents blocking us 6331 if (hasAncestorThatBlocksDescendantFocus()) { 6332 return false; 6333 } 6334 6335 handleFocusGainInternal(direction, previouslyFocusedRect); 6336 return true; 6337 } 6338 6339 /** 6340 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6341 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6342 * touch mode to request focus when they are touched. 6343 * 6344 * @return Whether this view or one of its descendants actually took focus. 6345 * 6346 * @see #isInTouchMode() 6347 * 6348 */ 6349 public final boolean requestFocusFromTouch() { 6350 // Leave touch mode if we need to 6351 if (isInTouchMode()) { 6352 ViewRootImpl viewRoot = getViewRootImpl(); 6353 if (viewRoot != null) { 6354 viewRoot.ensureTouchMode(false); 6355 } 6356 } 6357 return requestFocus(View.FOCUS_DOWN); 6358 } 6359 6360 /** 6361 * @return Whether any ancestor of this view blocks descendant focus. 6362 */ 6363 private boolean hasAncestorThatBlocksDescendantFocus() { 6364 ViewParent ancestor = mParent; 6365 while (ancestor instanceof ViewGroup) { 6366 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6367 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6368 return true; 6369 } else { 6370 ancestor = vgAncestor.getParent(); 6371 } 6372 } 6373 return false; 6374 } 6375 6376 /** 6377 * Gets the mode for determining whether this View is important for accessibility 6378 * which is if it fires accessibility events and if it is reported to 6379 * accessibility services that query the screen. 6380 * 6381 * @return The mode for determining whether a View is important for accessibility. 6382 * 6383 * @attr ref android.R.styleable#View_importantForAccessibility 6384 * 6385 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6386 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6387 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6388 */ 6389 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6390 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6391 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6392 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6393 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6394 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6395 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6396 }) 6397 public int getImportantForAccessibility() { 6398 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6399 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6400 } 6401 6402 /** 6403 * Sets how to determine whether this view is important for accessibility 6404 * which is if it fires accessibility events and if it is reported to 6405 * accessibility services that query the screen. 6406 * 6407 * @param mode How to determine whether this view is important for accessibility. 6408 * 6409 * @attr ref android.R.styleable#View_importantForAccessibility 6410 * 6411 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6412 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6413 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6414 */ 6415 public void setImportantForAccessibility(int mode) { 6416 if (mode != getImportantForAccessibility()) { 6417 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6418 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6419 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6420 notifyAccessibilityStateChanged(); 6421 } 6422 } 6423 6424 /** 6425 * Gets whether this view should be exposed for accessibility. 6426 * 6427 * @return Whether the view is exposed for accessibility. 6428 * 6429 * @hide 6430 */ 6431 public boolean isImportantForAccessibility() { 6432 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6433 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6434 switch (mode) { 6435 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6436 return true; 6437 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6438 return false; 6439 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6440 return isActionableForAccessibility() || hasListenersForAccessibility(); 6441 default: 6442 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6443 + mode); 6444 } 6445 } 6446 6447 /** 6448 * Gets the parent for accessibility purposes. Note that the parent for 6449 * accessibility is not necessary the immediate parent. It is the first 6450 * predecessor that is important for accessibility. 6451 * 6452 * @return The parent for accessibility purposes. 6453 */ 6454 public ViewParent getParentForAccessibility() { 6455 if (mParent instanceof View) { 6456 View parentView = (View) mParent; 6457 if (parentView.includeForAccessibility()) { 6458 return mParent; 6459 } else { 6460 return mParent.getParentForAccessibility(); 6461 } 6462 } 6463 return null; 6464 } 6465 6466 /** 6467 * Adds the children of a given View for accessibility. Since some Views are 6468 * not important for accessibility the children for accessibility are not 6469 * necessarily direct children of the riew, rather they are the first level of 6470 * descendants important for accessibility. 6471 * 6472 * @param children The list of children for accessibility. 6473 */ 6474 public void addChildrenForAccessibility(ArrayList<View> children) { 6475 if (includeForAccessibility()) { 6476 children.add(this); 6477 } 6478 } 6479 6480 /** 6481 * Whether to regard this view for accessibility. A view is regarded for 6482 * accessibility if it is important for accessibility or the querying 6483 * accessibility service has explicitly requested that view not 6484 * important for accessibility are regarded. 6485 * 6486 * @return Whether to regard the view for accessibility. 6487 * 6488 * @hide 6489 */ 6490 public boolean includeForAccessibility() { 6491 if (mAttachInfo != null) { 6492 if (!mAttachInfo.mIncludeNotImportantViews) { 6493 return isImportantForAccessibility(); 6494 } 6495 return true; 6496 } 6497 return false; 6498 } 6499 6500 /** 6501 * Returns whether the View is considered actionable from 6502 * accessibility perspective. Such view are important for 6503 * accessiiblity. 6504 * 6505 * @return True if the view is actionable for accessibility. 6506 * 6507 * @hide 6508 */ 6509 public boolean isActionableForAccessibility() { 6510 return (isClickable() || isLongClickable() || isFocusable()); 6511 } 6512 6513 /** 6514 * Returns whether the View has registered callbacks wich makes it 6515 * important for accessiiblity. 6516 * 6517 * @return True if the view is actionable for accessibility. 6518 */ 6519 private boolean hasListenersForAccessibility() { 6520 ListenerInfo info = getListenerInfo(); 6521 return mTouchDelegate != null || info.mOnKeyListener != null 6522 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6523 || info.mOnHoverListener != null || info.mOnDragListener != null; 6524 } 6525 6526 /** 6527 * Notifies accessibility services that some view's important for 6528 * accessibility state has changed. Note that such notifications 6529 * are made at most once every 6530 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6531 * to avoid unnecessary load to the system. Also once a view has 6532 * made a notifucation this method is a NOP until the notification has 6533 * been sent to clients. 6534 * 6535 * @hide 6536 * 6537 * TODO: Makse sure this method is called for any view state change 6538 * that is interesting for accessilility purposes. 6539 */ 6540 public void notifyAccessibilityStateChanged() { 6541 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6542 return; 6543 } 6544 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6545 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6546 if (mParent != null) { 6547 mParent.childAccessibilityStateChanged(this); 6548 } 6549 } 6550 } 6551 6552 /** 6553 * Reset the state indicating the this view has requested clients 6554 * interested in its accessiblity state to be notified. 6555 * 6556 * @hide 6557 */ 6558 public void resetAccessibilityStateChanged() { 6559 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6560 } 6561 6562 /** 6563 * Performs the specified accessibility action on the view. For 6564 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6565 * <p> 6566 * If an {@link AccessibilityDelegate} has been specified via calling 6567 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6568 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6569 * is responsible for handling this call. 6570 * </p> 6571 * 6572 * @param action The action to perform. 6573 * @param arguments Optional action arguments. 6574 * @return Whether the action was performed. 6575 */ 6576 public boolean performAccessibilityAction(int action, Bundle arguments) { 6577 if (mAccessibilityDelegate != null) { 6578 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6579 } else { 6580 return performAccessibilityActionInternal(action, arguments); 6581 } 6582 } 6583 6584 /** 6585 * @see #performAccessibilityAction(int, Bundle) 6586 * 6587 * Note: Called from the default {@link AccessibilityDelegate}. 6588 */ 6589 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6590 switch (action) { 6591 case AccessibilityNodeInfo.ACTION_CLICK: { 6592 if (isClickable()) { 6593 return performClick(); 6594 } 6595 } break; 6596 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6597 if (isLongClickable()) { 6598 return performLongClick(); 6599 } 6600 } break; 6601 case AccessibilityNodeInfo.ACTION_FOCUS: { 6602 if (!hasFocus()) { 6603 // Get out of touch mode since accessibility 6604 // wants to move focus around. 6605 getViewRootImpl().ensureTouchMode(false); 6606 return requestFocus(); 6607 } 6608 } break; 6609 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6610 if (hasFocus()) { 6611 clearFocus(); 6612 return !isFocused(); 6613 } 6614 } break; 6615 case AccessibilityNodeInfo.ACTION_SELECT: { 6616 if (!isSelected()) { 6617 setSelected(true); 6618 return isSelected(); 6619 } 6620 } break; 6621 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6622 if (isSelected()) { 6623 setSelected(false); 6624 return !isSelected(); 6625 } 6626 } break; 6627 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6628 if (!isAccessibilityFocused()) { 6629 return requestAccessibilityFocus(); 6630 } 6631 } break; 6632 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6633 if (isAccessibilityFocused()) { 6634 clearAccessibilityFocus(); 6635 return true; 6636 } 6637 } break; 6638 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6639 if (arguments != null) { 6640 final int granularity = arguments.getInt( 6641 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6642 return nextAtGranularity(granularity); 6643 } 6644 } break; 6645 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6646 if (arguments != null) { 6647 final int granularity = arguments.getInt( 6648 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6649 return previousAtGranularity(granularity); 6650 } 6651 } break; 6652 } 6653 return false; 6654 } 6655 6656 private boolean nextAtGranularity(int granularity) { 6657 CharSequence text = getIterableTextForAccessibility(); 6658 if (text != null && text.length() > 0) { 6659 return false; 6660 } 6661 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6662 if (iterator == null) { 6663 return false; 6664 } 6665 final int current = getAccessibilityCursorPosition(); 6666 final int[] range = iterator.following(current); 6667 if (range == null) { 6668 setAccessibilityCursorPosition(-1); 6669 return false; 6670 } 6671 final int start = range[0]; 6672 final int end = range[1]; 6673 setAccessibilityCursorPosition(start); 6674 sendViewTextTraversedAtGranularityEvent( 6675 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6676 granularity, start, end); 6677 return true; 6678 } 6679 6680 private boolean previousAtGranularity(int granularity) { 6681 CharSequence text = getIterableTextForAccessibility(); 6682 if (text != null && text.length() > 0) { 6683 return false; 6684 } 6685 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6686 if (iterator == null) { 6687 return false; 6688 } 6689 final int selectionStart = getAccessibilityCursorPosition(); 6690 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6691 final int[] range = iterator.preceding(current); 6692 if (range == null) { 6693 setAccessibilityCursorPosition(-1); 6694 return false; 6695 } 6696 final int start = range[0]; 6697 final int end = range[1]; 6698 setAccessibilityCursorPosition(end); 6699 sendViewTextTraversedAtGranularityEvent( 6700 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6701 granularity, start, end); 6702 return true; 6703 } 6704 6705 /** 6706 * Gets the text reported for accessibility purposes. 6707 * 6708 * @return The accessibility text. 6709 * 6710 * @hide 6711 */ 6712 public CharSequence getIterableTextForAccessibility() { 6713 return mContentDescription; 6714 } 6715 6716 /** 6717 * @hide 6718 */ 6719 public int getAccessibilityCursorPosition() { 6720 return mAccessibilityCursorPosition; 6721 } 6722 6723 /** 6724 * @hide 6725 */ 6726 public void setAccessibilityCursorPosition(int position) { 6727 mAccessibilityCursorPosition = position; 6728 } 6729 6730 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6731 int fromIndex, int toIndex) { 6732 if (mParent == null) { 6733 return; 6734 } 6735 AccessibilityEvent event = AccessibilityEvent.obtain( 6736 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6737 onInitializeAccessibilityEvent(event); 6738 onPopulateAccessibilityEvent(event); 6739 event.setFromIndex(fromIndex); 6740 event.setToIndex(toIndex); 6741 event.setAction(action); 6742 event.setMovementGranularity(granularity); 6743 mParent.requestSendAccessibilityEvent(this, event); 6744 } 6745 6746 /** 6747 * @hide 6748 */ 6749 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6750 switch (granularity) { 6751 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6752 CharSequence text = getIterableTextForAccessibility(); 6753 if (text != null && text.length() > 0) { 6754 CharacterTextSegmentIterator iterator = 6755 CharacterTextSegmentIterator.getInstance(mContext); 6756 iterator.initialize(text.toString()); 6757 return iterator; 6758 } 6759 } break; 6760 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6761 CharSequence text = getIterableTextForAccessibility(); 6762 if (text != null && text.length() > 0) { 6763 WordTextSegmentIterator iterator = 6764 WordTextSegmentIterator.getInstance(mContext); 6765 iterator.initialize(text.toString()); 6766 return iterator; 6767 } 6768 } break; 6769 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6770 CharSequence text = getIterableTextForAccessibility(); 6771 if (text != null && text.length() > 0) { 6772 ParagraphTextSegmentIterator iterator = 6773 ParagraphTextSegmentIterator.getInstance(); 6774 iterator.initialize(text.toString()); 6775 return iterator; 6776 } 6777 } break; 6778 } 6779 return null; 6780 } 6781 6782 /** 6783 * @hide 6784 */ 6785 public void dispatchStartTemporaryDetach() { 6786 clearAccessibilityFocus(); 6787 onStartTemporaryDetach(); 6788 } 6789 6790 /** 6791 * This is called when a container is going to temporarily detach a child, with 6792 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6793 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6794 * {@link #onDetachedFromWindow()} when the container is done. 6795 */ 6796 public void onStartTemporaryDetach() { 6797 removeUnsetPressCallback(); 6798 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6799 } 6800 6801 /** 6802 * @hide 6803 */ 6804 public void dispatchFinishTemporaryDetach() { 6805 onFinishTemporaryDetach(); 6806 } 6807 6808 /** 6809 * Called after {@link #onStartTemporaryDetach} when the container is done 6810 * changing the view. 6811 */ 6812 public void onFinishTemporaryDetach() { 6813 } 6814 6815 /** 6816 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6817 * for this view's window. Returns null if the view is not currently attached 6818 * to the window. Normally you will not need to use this directly, but 6819 * just use the standard high-level event callbacks like 6820 * {@link #onKeyDown(int, KeyEvent)}. 6821 */ 6822 public KeyEvent.DispatcherState getKeyDispatcherState() { 6823 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6824 } 6825 6826 /** 6827 * Dispatch a key event before it is processed by any input method 6828 * associated with the view hierarchy. This can be used to intercept 6829 * key events in special situations before the IME consumes them; a 6830 * typical example would be handling the BACK key to update the application's 6831 * UI instead of allowing the IME to see it and close itself. 6832 * 6833 * @param event The key event to be dispatched. 6834 * @return True if the event was handled, false otherwise. 6835 */ 6836 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6837 return onKeyPreIme(event.getKeyCode(), event); 6838 } 6839 6840 /** 6841 * Dispatch a key event to the next view on the focus path. This path runs 6842 * from the top of the view tree down to the currently focused view. If this 6843 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6844 * the next node down the focus path. This method also fires any key 6845 * listeners. 6846 * 6847 * @param event The key event to be dispatched. 6848 * @return True if the event was handled, false otherwise. 6849 */ 6850 public boolean dispatchKeyEvent(KeyEvent event) { 6851 if (mInputEventConsistencyVerifier != null) { 6852 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6853 } 6854 6855 // Give any attached key listener a first crack at the event. 6856 //noinspection SimplifiableIfStatement 6857 ListenerInfo li = mListenerInfo; 6858 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6859 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6860 return true; 6861 } 6862 6863 if (event.dispatch(this, mAttachInfo != null 6864 ? mAttachInfo.mKeyDispatchState : null, this)) { 6865 return true; 6866 } 6867 6868 if (mInputEventConsistencyVerifier != null) { 6869 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6870 } 6871 return false; 6872 } 6873 6874 /** 6875 * Dispatches a key shortcut event. 6876 * 6877 * @param event The key event to be dispatched. 6878 * @return True if the event was handled by the view, false otherwise. 6879 */ 6880 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6881 return onKeyShortcut(event.getKeyCode(), event); 6882 } 6883 6884 /** 6885 * Pass the touch screen motion event down to the target view, or this 6886 * view if it is the target. 6887 * 6888 * @param event The motion event to be dispatched. 6889 * @return True if the event was handled by the view, false otherwise. 6890 */ 6891 public boolean dispatchTouchEvent(MotionEvent event) { 6892 if (mInputEventConsistencyVerifier != null) { 6893 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6894 } 6895 6896 if (onFilterTouchEventForSecurity(event)) { 6897 //noinspection SimplifiableIfStatement 6898 ListenerInfo li = mListenerInfo; 6899 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6900 && li.mOnTouchListener.onTouch(this, event)) { 6901 return true; 6902 } 6903 6904 if (onTouchEvent(event)) { 6905 return true; 6906 } 6907 } 6908 6909 if (mInputEventConsistencyVerifier != null) { 6910 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6911 } 6912 return false; 6913 } 6914 6915 /** 6916 * Filter the touch event to apply security policies. 6917 * 6918 * @param event The motion event to be filtered. 6919 * @return True if the event should be dispatched, false if the event should be dropped. 6920 * 6921 * @see #getFilterTouchesWhenObscured 6922 */ 6923 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6924 //noinspection RedundantIfStatement 6925 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6926 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6927 // Window is obscured, drop this touch. 6928 return false; 6929 } 6930 return true; 6931 } 6932 6933 /** 6934 * Pass a trackball motion event down to the focused view. 6935 * 6936 * @param event The motion event to be dispatched. 6937 * @return True if the event was handled by the view, false otherwise. 6938 */ 6939 public boolean dispatchTrackballEvent(MotionEvent event) { 6940 if (mInputEventConsistencyVerifier != null) { 6941 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6942 } 6943 6944 return onTrackballEvent(event); 6945 } 6946 6947 /** 6948 * Dispatch a generic motion event. 6949 * <p> 6950 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6951 * are delivered to the view under the pointer. All other generic motion events are 6952 * delivered to the focused view. Hover events are handled specially and are delivered 6953 * to {@link #onHoverEvent(MotionEvent)}. 6954 * </p> 6955 * 6956 * @param event The motion event to be dispatched. 6957 * @return True if the event was handled by the view, false otherwise. 6958 */ 6959 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6960 if (mInputEventConsistencyVerifier != null) { 6961 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6962 } 6963 6964 final int source = event.getSource(); 6965 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6966 final int action = event.getAction(); 6967 if (action == MotionEvent.ACTION_HOVER_ENTER 6968 || action == MotionEvent.ACTION_HOVER_MOVE 6969 || action == MotionEvent.ACTION_HOVER_EXIT) { 6970 if (dispatchHoverEvent(event)) { 6971 return true; 6972 } 6973 } else if (dispatchGenericPointerEvent(event)) { 6974 return true; 6975 } 6976 } else if (dispatchGenericFocusedEvent(event)) { 6977 return true; 6978 } 6979 6980 if (dispatchGenericMotionEventInternal(event)) { 6981 return true; 6982 } 6983 6984 if (mInputEventConsistencyVerifier != null) { 6985 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6986 } 6987 return false; 6988 } 6989 6990 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6991 //noinspection SimplifiableIfStatement 6992 ListenerInfo li = mListenerInfo; 6993 if (li != null && li.mOnGenericMotionListener != null 6994 && (mViewFlags & ENABLED_MASK) == ENABLED 6995 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6996 return true; 6997 } 6998 6999 if (onGenericMotionEvent(event)) { 7000 return true; 7001 } 7002 7003 if (mInputEventConsistencyVerifier != null) { 7004 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7005 } 7006 return false; 7007 } 7008 7009 /** 7010 * Dispatch a hover event. 7011 * <p> 7012 * Do not call this method directly. 7013 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7014 * </p> 7015 * 7016 * @param event The motion event to be dispatched. 7017 * @return True if the event was handled by the view, false otherwise. 7018 */ 7019 protected boolean dispatchHoverEvent(MotionEvent event) { 7020 //noinspection SimplifiableIfStatement 7021 ListenerInfo li = mListenerInfo; 7022 if (li != null && li.mOnHoverListener != null 7023 && (mViewFlags & ENABLED_MASK) == ENABLED 7024 && li.mOnHoverListener.onHover(this, event)) { 7025 return true; 7026 } 7027 7028 return onHoverEvent(event); 7029 } 7030 7031 /** 7032 * Returns true if the view has a child to which it has recently sent 7033 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7034 * it does not have a hovered child, then it must be the innermost hovered view. 7035 * @hide 7036 */ 7037 protected boolean hasHoveredChild() { 7038 return false; 7039 } 7040 7041 /** 7042 * Dispatch a generic motion event to the view under the first pointer. 7043 * <p> 7044 * Do not call this method directly. 7045 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7046 * </p> 7047 * 7048 * @param event The motion event to be dispatched. 7049 * @return True if the event was handled by the view, false otherwise. 7050 */ 7051 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7052 return false; 7053 } 7054 7055 /** 7056 * Dispatch a generic motion event to the currently focused view. 7057 * <p> 7058 * Do not call this method directly. 7059 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7060 * </p> 7061 * 7062 * @param event The motion event to be dispatched. 7063 * @return True if the event was handled by the view, false otherwise. 7064 */ 7065 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7066 return false; 7067 } 7068 7069 /** 7070 * Dispatch a pointer event. 7071 * <p> 7072 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7073 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7074 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7075 * and should not be expected to handle other pointing device features. 7076 * </p> 7077 * 7078 * @param event The motion event to be dispatched. 7079 * @return True if the event was handled by the view, false otherwise. 7080 * @hide 7081 */ 7082 public final boolean dispatchPointerEvent(MotionEvent event) { 7083 if (event.isTouchEvent()) { 7084 return dispatchTouchEvent(event); 7085 } else { 7086 return dispatchGenericMotionEvent(event); 7087 } 7088 } 7089 7090 /** 7091 * Called when the window containing this view gains or loses window focus. 7092 * ViewGroups should override to route to their children. 7093 * 7094 * @param hasFocus True if the window containing this view now has focus, 7095 * false otherwise. 7096 */ 7097 public void dispatchWindowFocusChanged(boolean hasFocus) { 7098 onWindowFocusChanged(hasFocus); 7099 } 7100 7101 /** 7102 * Called when the window containing this view gains or loses focus. Note 7103 * that this is separate from view focus: to receive key events, both 7104 * your view and its window must have focus. If a window is displayed 7105 * on top of yours that takes input focus, then your own window will lose 7106 * focus but the view focus will remain unchanged. 7107 * 7108 * @param hasWindowFocus True if the window containing this view now has 7109 * focus, false otherwise. 7110 */ 7111 public void onWindowFocusChanged(boolean hasWindowFocus) { 7112 InputMethodManager imm = InputMethodManager.peekInstance(); 7113 if (!hasWindowFocus) { 7114 if (isPressed()) { 7115 setPressed(false); 7116 } 7117 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7118 imm.focusOut(this); 7119 } 7120 removeLongPressCallback(); 7121 removeTapCallback(); 7122 onFocusLost(); 7123 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7124 imm.focusIn(this); 7125 } 7126 refreshDrawableState(); 7127 } 7128 7129 /** 7130 * Returns true if this view is in a window that currently has window focus. 7131 * Note that this is not the same as the view itself having focus. 7132 * 7133 * @return True if this view is in a window that currently has window focus. 7134 */ 7135 public boolean hasWindowFocus() { 7136 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7137 } 7138 7139 /** 7140 * Dispatch a view visibility change down the view hierarchy. 7141 * ViewGroups should override to route to their children. 7142 * @param changedView The view whose visibility changed. Could be 'this' or 7143 * an ancestor view. 7144 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7145 * {@link #INVISIBLE} or {@link #GONE}. 7146 */ 7147 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7148 onVisibilityChanged(changedView, visibility); 7149 } 7150 7151 /** 7152 * Called when the visibility of the view or an ancestor of the view is changed. 7153 * @param changedView The view whose visibility changed. Could be 'this' or 7154 * an ancestor view. 7155 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7156 * {@link #INVISIBLE} or {@link #GONE}. 7157 */ 7158 protected void onVisibilityChanged(View changedView, int visibility) { 7159 if (visibility == VISIBLE) { 7160 if (mAttachInfo != null) { 7161 initialAwakenScrollBars(); 7162 } else { 7163 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7164 } 7165 } 7166 } 7167 7168 /** 7169 * Dispatch a hint about whether this view is displayed. For instance, when 7170 * a View moves out of the screen, it might receives a display hint indicating 7171 * the view is not displayed. Applications should not <em>rely</em> on this hint 7172 * as there is no guarantee that they will receive one. 7173 * 7174 * @param hint A hint about whether or not this view is displayed: 7175 * {@link #VISIBLE} or {@link #INVISIBLE}. 7176 */ 7177 public void dispatchDisplayHint(int hint) { 7178 onDisplayHint(hint); 7179 } 7180 7181 /** 7182 * Gives this view a hint about whether is displayed or not. For instance, when 7183 * a View moves out of the screen, it might receives a display hint indicating 7184 * the view is not displayed. Applications should not <em>rely</em> on this hint 7185 * as there is no guarantee that they will receive one. 7186 * 7187 * @param hint A hint about whether or not this view is displayed: 7188 * {@link #VISIBLE} or {@link #INVISIBLE}. 7189 */ 7190 protected void onDisplayHint(int hint) { 7191 } 7192 7193 /** 7194 * Dispatch a window visibility change down the view hierarchy. 7195 * ViewGroups should override to route to their children. 7196 * 7197 * @param visibility The new visibility of the window. 7198 * 7199 * @see #onWindowVisibilityChanged(int) 7200 */ 7201 public void dispatchWindowVisibilityChanged(int visibility) { 7202 onWindowVisibilityChanged(visibility); 7203 } 7204 7205 /** 7206 * Called when the window containing has change its visibility 7207 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7208 * that this tells you whether or not your window is being made visible 7209 * to the window manager; this does <em>not</em> tell you whether or not 7210 * your window is obscured by other windows on the screen, even if it 7211 * is itself visible. 7212 * 7213 * @param visibility The new visibility of the window. 7214 */ 7215 protected void onWindowVisibilityChanged(int visibility) { 7216 if (visibility == VISIBLE) { 7217 initialAwakenScrollBars(); 7218 } 7219 } 7220 7221 /** 7222 * Returns the current visibility of the window this view is attached to 7223 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7224 * 7225 * @return Returns the current visibility of the view's window. 7226 */ 7227 public int getWindowVisibility() { 7228 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7229 } 7230 7231 /** 7232 * Retrieve the overall visible display size in which the window this view is 7233 * attached to has been positioned in. This takes into account screen 7234 * decorations above the window, for both cases where the window itself 7235 * is being position inside of them or the window is being placed under 7236 * then and covered insets are used for the window to position its content 7237 * inside. In effect, this tells you the available area where content can 7238 * be placed and remain visible to users. 7239 * 7240 * <p>This function requires an IPC back to the window manager to retrieve 7241 * the requested information, so should not be used in performance critical 7242 * code like drawing. 7243 * 7244 * @param outRect Filled in with the visible display frame. If the view 7245 * is not attached to a window, this is simply the raw display size. 7246 */ 7247 public void getWindowVisibleDisplayFrame(Rect outRect) { 7248 if (mAttachInfo != null) { 7249 try { 7250 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7251 } catch (RemoteException e) { 7252 return; 7253 } 7254 // XXX This is really broken, and probably all needs to be done 7255 // in the window manager, and we need to know more about whether 7256 // we want the area behind or in front of the IME. 7257 final Rect insets = mAttachInfo.mVisibleInsets; 7258 outRect.left += insets.left; 7259 outRect.top += insets.top; 7260 outRect.right -= insets.right; 7261 outRect.bottom -= insets.bottom; 7262 return; 7263 } 7264 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7265 d.getRectSize(outRect); 7266 } 7267 7268 /** 7269 * Dispatch a notification about a resource configuration change down 7270 * the view hierarchy. 7271 * ViewGroups should override to route to their children. 7272 * 7273 * @param newConfig The new resource configuration. 7274 * 7275 * @see #onConfigurationChanged(android.content.res.Configuration) 7276 */ 7277 public void dispatchConfigurationChanged(Configuration newConfig) { 7278 onConfigurationChanged(newConfig); 7279 } 7280 7281 /** 7282 * Called when the current configuration of the resources being used 7283 * by the application have changed. You can use this to decide when 7284 * to reload resources that can changed based on orientation and other 7285 * configuration characterstics. You only need to use this if you are 7286 * not relying on the normal {@link android.app.Activity} mechanism of 7287 * recreating the activity instance upon a configuration change. 7288 * 7289 * @param newConfig The new resource configuration. 7290 */ 7291 protected void onConfigurationChanged(Configuration newConfig) { 7292 } 7293 7294 /** 7295 * Private function to aggregate all per-view attributes in to the view 7296 * root. 7297 */ 7298 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7299 performCollectViewAttributes(attachInfo, visibility); 7300 } 7301 7302 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7303 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7304 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7305 attachInfo.mKeepScreenOn = true; 7306 } 7307 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7308 ListenerInfo li = mListenerInfo; 7309 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7310 attachInfo.mHasSystemUiListeners = true; 7311 } 7312 } 7313 } 7314 7315 void needGlobalAttributesUpdate(boolean force) { 7316 final AttachInfo ai = mAttachInfo; 7317 if (ai != null) { 7318 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7319 || ai.mHasSystemUiListeners) { 7320 ai.mRecomputeGlobalAttributes = true; 7321 } 7322 } 7323 } 7324 7325 /** 7326 * Returns whether the device is currently in touch mode. Touch mode is entered 7327 * once the user begins interacting with the device by touch, and affects various 7328 * things like whether focus is always visible to the user. 7329 * 7330 * @return Whether the device is in touch mode. 7331 */ 7332 @ViewDebug.ExportedProperty 7333 public boolean isInTouchMode() { 7334 if (mAttachInfo != null) { 7335 return mAttachInfo.mInTouchMode; 7336 } else { 7337 return ViewRootImpl.isInTouchMode(); 7338 } 7339 } 7340 7341 /** 7342 * Returns the context the view is running in, through which it can 7343 * access the current theme, resources, etc. 7344 * 7345 * @return The view's Context. 7346 */ 7347 @ViewDebug.CapturedViewProperty 7348 public final Context getContext() { 7349 return mContext; 7350 } 7351 7352 /** 7353 * Handle a key event before it is processed by any input method 7354 * associated with the view hierarchy. This can be used to intercept 7355 * key events in special situations before the IME consumes them; a 7356 * typical example would be handling the BACK key to update the application's 7357 * UI instead of allowing the IME to see it and close itself. 7358 * 7359 * @param keyCode The value in event.getKeyCode(). 7360 * @param event Description of the key event. 7361 * @return If you handled the event, return true. If you want to allow the 7362 * event to be handled by the next receiver, return false. 7363 */ 7364 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7365 return false; 7366 } 7367 7368 /** 7369 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7370 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7371 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7372 * is released, if the view is enabled and clickable. 7373 * 7374 * @param keyCode A key code that represents the button pressed, from 7375 * {@link android.view.KeyEvent}. 7376 * @param event The KeyEvent object that defines the button action. 7377 */ 7378 public boolean onKeyDown(int keyCode, KeyEvent event) { 7379 boolean result = false; 7380 7381 switch (keyCode) { 7382 case KeyEvent.KEYCODE_DPAD_CENTER: 7383 case KeyEvent.KEYCODE_ENTER: { 7384 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7385 return true; 7386 } 7387 // Long clickable items don't necessarily have to be clickable 7388 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7389 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7390 (event.getRepeatCount() == 0)) { 7391 setPressed(true); 7392 checkForLongClick(0); 7393 return true; 7394 } 7395 break; 7396 } 7397 } 7398 return result; 7399 } 7400 7401 /** 7402 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7403 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7404 * the event). 7405 */ 7406 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7407 return false; 7408 } 7409 7410 /** 7411 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7412 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7413 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7414 * {@link KeyEvent#KEYCODE_ENTER} is released. 7415 * 7416 * @param keyCode A key code that represents the button pressed, from 7417 * {@link android.view.KeyEvent}. 7418 * @param event The KeyEvent object that defines the button action. 7419 */ 7420 public boolean onKeyUp(int keyCode, KeyEvent event) { 7421 boolean result = false; 7422 7423 switch (keyCode) { 7424 case KeyEvent.KEYCODE_DPAD_CENTER: 7425 case KeyEvent.KEYCODE_ENTER: { 7426 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7427 return true; 7428 } 7429 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7430 setPressed(false); 7431 7432 if (!mHasPerformedLongPress) { 7433 // This is a tap, so remove the longpress check 7434 removeLongPressCallback(); 7435 7436 result = performClick(); 7437 } 7438 } 7439 break; 7440 } 7441 } 7442 return result; 7443 } 7444 7445 /** 7446 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7447 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7448 * the event). 7449 * 7450 * @param keyCode A key code that represents the button pressed, from 7451 * {@link android.view.KeyEvent}. 7452 * @param repeatCount The number of times the action was made. 7453 * @param event The KeyEvent object that defines the button action. 7454 */ 7455 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7456 return false; 7457 } 7458 7459 /** 7460 * Called on the focused view when a key shortcut event is not handled. 7461 * Override this method to implement local key shortcuts for the View. 7462 * Key shortcuts can also be implemented by setting the 7463 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7464 * 7465 * @param keyCode The value in event.getKeyCode(). 7466 * @param event Description of the key event. 7467 * @return If you handled the event, return true. If you want to allow the 7468 * event to be handled by the next receiver, return false. 7469 */ 7470 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7471 return false; 7472 } 7473 7474 /** 7475 * Check whether the called view is a text editor, in which case it 7476 * would make sense to automatically display a soft input window for 7477 * it. Subclasses should override this if they implement 7478 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7479 * a call on that method would return a non-null InputConnection, and 7480 * they are really a first-class editor that the user would normally 7481 * start typing on when the go into a window containing your view. 7482 * 7483 * <p>The default implementation always returns false. This does 7484 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7485 * will not be called or the user can not otherwise perform edits on your 7486 * view; it is just a hint to the system that this is not the primary 7487 * purpose of this view. 7488 * 7489 * @return Returns true if this view is a text editor, else false. 7490 */ 7491 public boolean onCheckIsTextEditor() { 7492 return false; 7493 } 7494 7495 /** 7496 * Create a new InputConnection for an InputMethod to interact 7497 * with the view. The default implementation returns null, since it doesn't 7498 * support input methods. You can override this to implement such support. 7499 * This is only needed for views that take focus and text input. 7500 * 7501 * <p>When implementing this, you probably also want to implement 7502 * {@link #onCheckIsTextEditor()} to indicate you will return a 7503 * non-null InputConnection. 7504 * 7505 * @param outAttrs Fill in with attribute information about the connection. 7506 */ 7507 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7508 return null; 7509 } 7510 7511 /** 7512 * Called by the {@link android.view.inputmethod.InputMethodManager} 7513 * when a view who is not the current 7514 * input connection target is trying to make a call on the manager. The 7515 * default implementation returns false; you can override this to return 7516 * true for certain views if you are performing InputConnection proxying 7517 * to them. 7518 * @param view The View that is making the InputMethodManager call. 7519 * @return Return true to allow the call, false to reject. 7520 */ 7521 public boolean checkInputConnectionProxy(View view) { 7522 return false; 7523 } 7524 7525 /** 7526 * Show the context menu for this view. It is not safe to hold on to the 7527 * menu after returning from this method. 7528 * 7529 * You should normally not overload this method. Overload 7530 * {@link #onCreateContextMenu(ContextMenu)} or define an 7531 * {@link OnCreateContextMenuListener} to add items to the context menu. 7532 * 7533 * @param menu The context menu to populate 7534 */ 7535 public void createContextMenu(ContextMenu menu) { 7536 ContextMenuInfo menuInfo = getContextMenuInfo(); 7537 7538 // Sets the current menu info so all items added to menu will have 7539 // my extra info set. 7540 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7541 7542 onCreateContextMenu(menu); 7543 ListenerInfo li = mListenerInfo; 7544 if (li != null && li.mOnCreateContextMenuListener != null) { 7545 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7546 } 7547 7548 // Clear the extra information so subsequent items that aren't mine don't 7549 // have my extra info. 7550 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7551 7552 if (mParent != null) { 7553 mParent.createContextMenu(menu); 7554 } 7555 } 7556 7557 /** 7558 * Views should implement this if they have extra information to associate 7559 * with the context menu. The return result is supplied as a parameter to 7560 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7561 * callback. 7562 * 7563 * @return Extra information about the item for which the context menu 7564 * should be shown. This information will vary across different 7565 * subclasses of View. 7566 */ 7567 protected ContextMenuInfo getContextMenuInfo() { 7568 return null; 7569 } 7570 7571 /** 7572 * Views should implement this if the view itself is going to add items to 7573 * the context menu. 7574 * 7575 * @param menu the context menu to populate 7576 */ 7577 protected void onCreateContextMenu(ContextMenu menu) { 7578 } 7579 7580 /** 7581 * Implement this method to handle trackball motion events. The 7582 * <em>relative</em> movement of the trackball since the last event 7583 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7584 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7585 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7586 * they will often be fractional values, representing the more fine-grained 7587 * movement information available from a trackball). 7588 * 7589 * @param event The motion event. 7590 * @return True if the event was handled, false otherwise. 7591 */ 7592 public boolean onTrackballEvent(MotionEvent event) { 7593 return false; 7594 } 7595 7596 /** 7597 * Implement this method to handle generic motion events. 7598 * <p> 7599 * Generic motion events describe joystick movements, mouse hovers, track pad 7600 * touches, scroll wheel movements and other input events. The 7601 * {@link MotionEvent#getSource() source} of the motion event specifies 7602 * the class of input that was received. Implementations of this method 7603 * must examine the bits in the source before processing the event. 7604 * The following code example shows how this is done. 7605 * </p><p> 7606 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7607 * are delivered to the view under the pointer. All other generic motion events are 7608 * delivered to the focused view. 7609 * </p> 7610 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7611 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7612 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7613 * // process the joystick movement... 7614 * return true; 7615 * } 7616 * } 7617 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7618 * switch (event.getAction()) { 7619 * case MotionEvent.ACTION_HOVER_MOVE: 7620 * // process the mouse hover movement... 7621 * return true; 7622 * case MotionEvent.ACTION_SCROLL: 7623 * // process the scroll wheel movement... 7624 * return true; 7625 * } 7626 * } 7627 * return super.onGenericMotionEvent(event); 7628 * }</pre> 7629 * 7630 * @param event The generic motion event being processed. 7631 * @return True if the event was handled, false otherwise. 7632 */ 7633 public boolean onGenericMotionEvent(MotionEvent event) { 7634 return false; 7635 } 7636 7637 /** 7638 * Implement this method to handle hover events. 7639 * <p> 7640 * This method is called whenever a pointer is hovering into, over, or out of the 7641 * bounds of a view and the view is not currently being touched. 7642 * Hover events are represented as pointer events with action 7643 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7644 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7645 * </p> 7646 * <ul> 7647 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7648 * when the pointer enters the bounds of the view.</li> 7649 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7650 * when the pointer has already entered the bounds of the view and has moved.</li> 7651 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7652 * when the pointer has exited the bounds of the view or when the pointer is 7653 * about to go down due to a button click, tap, or similar user action that 7654 * causes the view to be touched.</li> 7655 * </ul> 7656 * <p> 7657 * The view should implement this method to return true to indicate that it is 7658 * handling the hover event, such as by changing its drawable state. 7659 * </p><p> 7660 * The default implementation calls {@link #setHovered} to update the hovered state 7661 * of the view when a hover enter or hover exit event is received, if the view 7662 * is enabled and is clickable. The default implementation also sends hover 7663 * accessibility events. 7664 * </p> 7665 * 7666 * @param event The motion event that describes the hover. 7667 * @return True if the view handled the hover event. 7668 * 7669 * @see #isHovered 7670 * @see #setHovered 7671 * @see #onHoverChanged 7672 */ 7673 public boolean onHoverEvent(MotionEvent event) { 7674 // The root view may receive hover (or touch) events that are outside the bounds of 7675 // the window. This code ensures that we only send accessibility events for 7676 // hovers that are actually within the bounds of the root view. 7677 final int action = event.getActionMasked(); 7678 if (!mSendingHoverAccessibilityEvents) { 7679 if ((action == MotionEvent.ACTION_HOVER_ENTER 7680 || action == MotionEvent.ACTION_HOVER_MOVE) 7681 && !hasHoveredChild() 7682 && pointInView(event.getX(), event.getY())) { 7683 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7684 mSendingHoverAccessibilityEvents = true; 7685 requestAccessibilityFocusFromHover(); 7686 } 7687 } else { 7688 if (action == MotionEvent.ACTION_HOVER_EXIT 7689 || (action == MotionEvent.ACTION_MOVE 7690 && !pointInView(event.getX(), event.getY()))) { 7691 mSendingHoverAccessibilityEvents = false; 7692 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7693 // If the window does not have input focus we take away accessibility 7694 // focus as soon as the user stop hovering over the view. 7695 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7696 getViewRootImpl().setAccessibilityFocusedHost(null); 7697 } 7698 } 7699 } 7700 7701 if (isHoverable()) { 7702 switch (action) { 7703 case MotionEvent.ACTION_HOVER_ENTER: 7704 setHovered(true); 7705 break; 7706 case MotionEvent.ACTION_HOVER_EXIT: 7707 setHovered(false); 7708 break; 7709 } 7710 7711 // Dispatch the event to onGenericMotionEvent before returning true. 7712 // This is to provide compatibility with existing applications that 7713 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7714 // break because of the new default handling for hoverable views 7715 // in onHoverEvent. 7716 // Note that onGenericMotionEvent will be called by default when 7717 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7718 dispatchGenericMotionEventInternal(event); 7719 return true; 7720 } 7721 7722 return false; 7723 } 7724 7725 /** 7726 * Returns true if the view should handle {@link #onHoverEvent} 7727 * by calling {@link #setHovered} to change its hovered state. 7728 * 7729 * @return True if the view is hoverable. 7730 */ 7731 private boolean isHoverable() { 7732 final int viewFlags = mViewFlags; 7733 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7734 return false; 7735 } 7736 7737 return (viewFlags & CLICKABLE) == CLICKABLE 7738 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7739 } 7740 7741 /** 7742 * Returns true if the view is currently hovered. 7743 * 7744 * @return True if the view is currently hovered. 7745 * 7746 * @see #setHovered 7747 * @see #onHoverChanged 7748 */ 7749 @ViewDebug.ExportedProperty 7750 public boolean isHovered() { 7751 return (mPrivateFlags & HOVERED) != 0; 7752 } 7753 7754 /** 7755 * Sets whether the view is currently hovered. 7756 * <p> 7757 * Calling this method also changes the drawable state of the view. This 7758 * enables the view to react to hover by using different drawable resources 7759 * to change its appearance. 7760 * </p><p> 7761 * The {@link #onHoverChanged} method is called when the hovered state changes. 7762 * </p> 7763 * 7764 * @param hovered True if the view is hovered. 7765 * 7766 * @see #isHovered 7767 * @see #onHoverChanged 7768 */ 7769 public void setHovered(boolean hovered) { 7770 if (hovered) { 7771 if ((mPrivateFlags & HOVERED) == 0) { 7772 mPrivateFlags |= HOVERED; 7773 refreshDrawableState(); 7774 onHoverChanged(true); 7775 } 7776 } else { 7777 if ((mPrivateFlags & HOVERED) != 0) { 7778 mPrivateFlags &= ~HOVERED; 7779 refreshDrawableState(); 7780 onHoverChanged(false); 7781 } 7782 } 7783 } 7784 7785 /** 7786 * Implement this method to handle hover state changes. 7787 * <p> 7788 * This method is called whenever the hover state changes as a result of a 7789 * call to {@link #setHovered}. 7790 * </p> 7791 * 7792 * @param hovered The current hover state, as returned by {@link #isHovered}. 7793 * 7794 * @see #isHovered 7795 * @see #setHovered 7796 */ 7797 public void onHoverChanged(boolean hovered) { 7798 } 7799 7800 /** 7801 * Implement this method to handle touch screen motion events. 7802 * 7803 * @param event The motion event. 7804 * @return True if the event was handled, false otherwise. 7805 */ 7806 public boolean onTouchEvent(MotionEvent event) { 7807 final int viewFlags = mViewFlags; 7808 7809 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7810 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7811 setPressed(false); 7812 } 7813 // A disabled view that is clickable still consumes the touch 7814 // events, it just doesn't respond to them. 7815 return (((viewFlags & CLICKABLE) == CLICKABLE || 7816 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7817 } 7818 7819 if (mTouchDelegate != null) { 7820 if (mTouchDelegate.onTouchEvent(event)) { 7821 return true; 7822 } 7823 } 7824 7825 if (((viewFlags & CLICKABLE) == CLICKABLE || 7826 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7827 switch (event.getAction()) { 7828 case MotionEvent.ACTION_UP: 7829 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7830 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7831 // take focus if we don't have it already and we should in 7832 // touch mode. 7833 boolean focusTaken = false; 7834 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7835 focusTaken = requestFocus(); 7836 } 7837 7838 if (prepressed) { 7839 // The button is being released before we actually 7840 // showed it as pressed. Make it show the pressed 7841 // state now (before scheduling the click) to ensure 7842 // the user sees it. 7843 setPressed(true); 7844 } 7845 7846 if (!mHasPerformedLongPress) { 7847 // This is a tap, so remove the longpress check 7848 removeLongPressCallback(); 7849 7850 // Only perform take click actions if we were in the pressed state 7851 if (!focusTaken) { 7852 // Use a Runnable and post this rather than calling 7853 // performClick directly. This lets other visual state 7854 // of the view update before click actions start. 7855 if (mPerformClick == null) { 7856 mPerformClick = new PerformClick(); 7857 } 7858 if (!post(mPerformClick)) { 7859 performClick(); 7860 } 7861 } 7862 } 7863 7864 if (mUnsetPressedState == null) { 7865 mUnsetPressedState = new UnsetPressedState(); 7866 } 7867 7868 if (prepressed) { 7869 postDelayed(mUnsetPressedState, 7870 ViewConfiguration.getPressedStateDuration()); 7871 } else if (!post(mUnsetPressedState)) { 7872 // If the post failed, unpress right now 7873 mUnsetPressedState.run(); 7874 } 7875 removeTapCallback(); 7876 } 7877 break; 7878 7879 case MotionEvent.ACTION_DOWN: 7880 mHasPerformedLongPress = false; 7881 7882 if (performButtonActionOnTouchDown(event)) { 7883 break; 7884 } 7885 7886 // Walk up the hierarchy to determine if we're inside a scrolling container. 7887 boolean isInScrollingContainer = isInScrollingContainer(); 7888 7889 // For views inside a scrolling container, delay the pressed feedback for 7890 // a short period in case this is a scroll. 7891 if (isInScrollingContainer) { 7892 mPrivateFlags |= PREPRESSED; 7893 if (mPendingCheckForTap == null) { 7894 mPendingCheckForTap = new CheckForTap(); 7895 } 7896 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7897 } else { 7898 // Not inside a scrolling container, so show the feedback right away 7899 setPressed(true); 7900 checkForLongClick(0); 7901 } 7902 break; 7903 7904 case MotionEvent.ACTION_CANCEL: 7905 setPressed(false); 7906 removeTapCallback(); 7907 break; 7908 7909 case MotionEvent.ACTION_MOVE: 7910 final int x = (int) event.getX(); 7911 final int y = (int) event.getY(); 7912 7913 // Be lenient about moving outside of buttons 7914 if (!pointInView(x, y, mTouchSlop)) { 7915 // Outside button 7916 removeTapCallback(); 7917 if ((mPrivateFlags & PRESSED) != 0) { 7918 // Remove any future long press/tap checks 7919 removeLongPressCallback(); 7920 7921 setPressed(false); 7922 } 7923 } 7924 break; 7925 } 7926 return true; 7927 } 7928 7929 return false; 7930 } 7931 7932 /** 7933 * @hide 7934 */ 7935 public boolean isInScrollingContainer() { 7936 ViewParent p = getParent(); 7937 while (p != null && p instanceof ViewGroup) { 7938 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7939 return true; 7940 } 7941 p = p.getParent(); 7942 } 7943 return false; 7944 } 7945 7946 /** 7947 * Remove the longpress detection timer. 7948 */ 7949 private void removeLongPressCallback() { 7950 if (mPendingCheckForLongPress != null) { 7951 removeCallbacks(mPendingCheckForLongPress); 7952 } 7953 } 7954 7955 /** 7956 * Remove the pending click action 7957 */ 7958 private void removePerformClickCallback() { 7959 if (mPerformClick != null) { 7960 removeCallbacks(mPerformClick); 7961 } 7962 } 7963 7964 /** 7965 * Remove the prepress detection timer. 7966 */ 7967 private void removeUnsetPressCallback() { 7968 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7969 setPressed(false); 7970 removeCallbacks(mUnsetPressedState); 7971 } 7972 } 7973 7974 /** 7975 * Remove the tap detection timer. 7976 */ 7977 private void removeTapCallback() { 7978 if (mPendingCheckForTap != null) { 7979 mPrivateFlags &= ~PREPRESSED; 7980 removeCallbacks(mPendingCheckForTap); 7981 } 7982 } 7983 7984 /** 7985 * Cancels a pending long press. Your subclass can use this if you 7986 * want the context menu to come up if the user presses and holds 7987 * at the same place, but you don't want it to come up if they press 7988 * and then move around enough to cause scrolling. 7989 */ 7990 public void cancelLongPress() { 7991 removeLongPressCallback(); 7992 7993 /* 7994 * The prepressed state handled by the tap callback is a display 7995 * construct, but the tap callback will post a long press callback 7996 * less its own timeout. Remove it here. 7997 */ 7998 removeTapCallback(); 7999 } 8000 8001 /** 8002 * Remove the pending callback for sending a 8003 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8004 */ 8005 private void removeSendViewScrolledAccessibilityEventCallback() { 8006 if (mSendViewScrolledAccessibilityEvent != null) { 8007 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8008 } 8009 } 8010 8011 /** 8012 * Sets the TouchDelegate for this View. 8013 */ 8014 public void setTouchDelegate(TouchDelegate delegate) { 8015 mTouchDelegate = delegate; 8016 } 8017 8018 /** 8019 * Gets the TouchDelegate for this View. 8020 */ 8021 public TouchDelegate getTouchDelegate() { 8022 return mTouchDelegate; 8023 } 8024 8025 /** 8026 * Set flags controlling behavior of this view. 8027 * 8028 * @param flags Constant indicating the value which should be set 8029 * @param mask Constant indicating the bit range that should be changed 8030 */ 8031 void setFlags(int flags, int mask) { 8032 int old = mViewFlags; 8033 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8034 8035 int changed = mViewFlags ^ old; 8036 if (changed == 0) { 8037 return; 8038 } 8039 int privateFlags = mPrivateFlags; 8040 8041 /* Check if the FOCUSABLE bit has changed */ 8042 if (((changed & FOCUSABLE_MASK) != 0) && 8043 ((privateFlags & HAS_BOUNDS) !=0)) { 8044 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8045 && ((privateFlags & FOCUSED) != 0)) { 8046 /* Give up focus if we are no longer focusable */ 8047 clearFocus(); 8048 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8049 && ((privateFlags & FOCUSED) == 0)) { 8050 /* 8051 * Tell the view system that we are now available to take focus 8052 * if no one else already has it. 8053 */ 8054 if (mParent != null) mParent.focusableViewAvailable(this); 8055 } 8056 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8057 notifyAccessibilityStateChanged(); 8058 } 8059 } 8060 8061 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8062 if ((changed & VISIBILITY_MASK) != 0) { 8063 /* 8064 * If this view is becoming visible, invalidate it in case it changed while 8065 * it was not visible. Marking it drawn ensures that the invalidation will 8066 * go through. 8067 */ 8068 mPrivateFlags |= DRAWN; 8069 invalidate(true); 8070 8071 needGlobalAttributesUpdate(true); 8072 8073 // a view becoming visible is worth notifying the parent 8074 // about in case nothing has focus. even if this specific view 8075 // isn't focusable, it may contain something that is, so let 8076 // the root view try to give this focus if nothing else does. 8077 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8078 mParent.focusableViewAvailable(this); 8079 } 8080 } 8081 } 8082 8083 /* Check if the GONE bit has changed */ 8084 if ((changed & GONE) != 0) { 8085 needGlobalAttributesUpdate(false); 8086 requestLayout(); 8087 8088 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8089 if (hasFocus()) clearFocus(); 8090 clearAccessibilityFocus(); 8091 destroyDrawingCache(); 8092 if (mParent instanceof View) { 8093 // GONE views noop invalidation, so invalidate the parent 8094 ((View) mParent).invalidate(true); 8095 } 8096 // Mark the view drawn to ensure that it gets invalidated properly the next 8097 // time it is visible and gets invalidated 8098 mPrivateFlags |= DRAWN; 8099 } 8100 if (mAttachInfo != null) { 8101 mAttachInfo.mViewVisibilityChanged = true; 8102 } 8103 } 8104 8105 /* Check if the VISIBLE bit has changed */ 8106 if ((changed & INVISIBLE) != 0) { 8107 needGlobalAttributesUpdate(false); 8108 /* 8109 * If this view is becoming invisible, set the DRAWN flag so that 8110 * the next invalidate() will not be skipped. 8111 */ 8112 mPrivateFlags |= DRAWN; 8113 8114 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8115 // root view becoming invisible shouldn't clear focus and accessibility focus 8116 if (getRootView() != this) { 8117 clearFocus(); 8118 clearAccessibilityFocus(); 8119 } 8120 } 8121 if (mAttachInfo != null) { 8122 mAttachInfo.mViewVisibilityChanged = true; 8123 } 8124 } 8125 8126 if ((changed & VISIBILITY_MASK) != 0) { 8127 if (mParent instanceof ViewGroup) { 8128 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8129 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8130 ((View) mParent).invalidate(true); 8131 } else if (mParent != null) { 8132 mParent.invalidateChild(this, null); 8133 } 8134 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8135 } 8136 8137 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8138 destroyDrawingCache(); 8139 } 8140 8141 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8142 destroyDrawingCache(); 8143 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8144 invalidateParentCaches(); 8145 } 8146 8147 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8148 destroyDrawingCache(); 8149 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8150 } 8151 8152 if ((changed & DRAW_MASK) != 0) { 8153 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8154 if (mBackground != null) { 8155 mPrivateFlags &= ~SKIP_DRAW; 8156 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8157 } else { 8158 mPrivateFlags |= SKIP_DRAW; 8159 } 8160 } else { 8161 mPrivateFlags &= ~SKIP_DRAW; 8162 } 8163 requestLayout(); 8164 invalidate(true); 8165 } 8166 8167 if ((changed & KEEP_SCREEN_ON) != 0) { 8168 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8169 mParent.recomputeViewAttributes(this); 8170 } 8171 } 8172 8173 if (AccessibilityManager.getInstance(mContext).isEnabled() 8174 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8175 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8176 notifyAccessibilityStateChanged(); 8177 } 8178 } 8179 8180 /** 8181 * Change the view's z order in the tree, so it's on top of other sibling 8182 * views 8183 */ 8184 public void bringToFront() { 8185 if (mParent != null) { 8186 mParent.bringChildToFront(this); 8187 } 8188 } 8189 8190 /** 8191 * This is called in response to an internal scroll in this view (i.e., the 8192 * view scrolled its own contents). This is typically as a result of 8193 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8194 * called. 8195 * 8196 * @param l Current horizontal scroll origin. 8197 * @param t Current vertical scroll origin. 8198 * @param oldl Previous horizontal scroll origin. 8199 * @param oldt Previous vertical scroll origin. 8200 */ 8201 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8202 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8203 postSendViewScrolledAccessibilityEventCallback(); 8204 } 8205 8206 mBackgroundSizeChanged = true; 8207 8208 final AttachInfo ai = mAttachInfo; 8209 if (ai != null) { 8210 ai.mViewScrollChanged = true; 8211 } 8212 } 8213 8214 /** 8215 * Interface definition for a callback to be invoked when the layout bounds of a view 8216 * changes due to layout processing. 8217 */ 8218 public interface OnLayoutChangeListener { 8219 /** 8220 * Called when the focus state of a view has changed. 8221 * 8222 * @param v The view whose state has changed. 8223 * @param left The new value of the view's left property. 8224 * @param top The new value of the view's top property. 8225 * @param right The new value of the view's right property. 8226 * @param bottom The new value of the view's bottom property. 8227 * @param oldLeft The previous value of the view's left property. 8228 * @param oldTop The previous value of the view's top property. 8229 * @param oldRight The previous value of the view's right property. 8230 * @param oldBottom The previous value of the view's bottom property. 8231 */ 8232 void onLayoutChange(View v, int left, int top, int right, int bottom, 8233 int oldLeft, int oldTop, int oldRight, int oldBottom); 8234 } 8235 8236 /** 8237 * This is called during layout when the size of this view has changed. If 8238 * you were just added to the view hierarchy, you're called with the old 8239 * values of 0. 8240 * 8241 * @param w Current width of this view. 8242 * @param h Current height of this view. 8243 * @param oldw Old width of this view. 8244 * @param oldh Old height of this view. 8245 */ 8246 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8247 } 8248 8249 /** 8250 * Called by draw to draw the child views. This may be overridden 8251 * by derived classes to gain control just before its children are drawn 8252 * (but after its own view has been drawn). 8253 * @param canvas the canvas on which to draw the view 8254 */ 8255 protected void dispatchDraw(Canvas canvas) { 8256 8257 } 8258 8259 /** 8260 * Gets the parent of this view. Note that the parent is a 8261 * ViewParent and not necessarily a View. 8262 * 8263 * @return Parent of this view. 8264 */ 8265 public final ViewParent getParent() { 8266 return mParent; 8267 } 8268 8269 /** 8270 * Set the horizontal scrolled position of your view. This will cause a call to 8271 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8272 * invalidated. 8273 * @param value the x position to scroll to 8274 */ 8275 public void setScrollX(int value) { 8276 scrollTo(value, mScrollY); 8277 } 8278 8279 /** 8280 * Set the vertical scrolled position of your view. This will cause a call to 8281 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8282 * invalidated. 8283 * @param value the y position to scroll to 8284 */ 8285 public void setScrollY(int value) { 8286 scrollTo(mScrollX, value); 8287 } 8288 8289 /** 8290 * Return the scrolled left position of this view. This is the left edge of 8291 * the displayed part of your view. You do not need to draw any pixels 8292 * farther left, since those are outside of the frame of your view on 8293 * screen. 8294 * 8295 * @return The left edge of the displayed part of your view, in pixels. 8296 */ 8297 public final int getScrollX() { 8298 return mScrollX; 8299 } 8300 8301 /** 8302 * Return the scrolled top position of this view. This is the top edge of 8303 * the displayed part of your view. You do not need to draw any pixels above 8304 * it, since those are outside of the frame of your view on screen. 8305 * 8306 * @return The top edge of the displayed part of your view, in pixels. 8307 */ 8308 public final int getScrollY() { 8309 return mScrollY; 8310 } 8311 8312 /** 8313 * Return the width of the your view. 8314 * 8315 * @return The width of your view, in pixels. 8316 */ 8317 @ViewDebug.ExportedProperty(category = "layout") 8318 public final int getWidth() { 8319 return mRight - mLeft; 8320 } 8321 8322 /** 8323 * Return the height of your view. 8324 * 8325 * @return The height of your view, in pixels. 8326 */ 8327 @ViewDebug.ExportedProperty(category = "layout") 8328 public final int getHeight() { 8329 return mBottom - mTop; 8330 } 8331 8332 /** 8333 * Return the visible drawing bounds of your view. Fills in the output 8334 * rectangle with the values from getScrollX(), getScrollY(), 8335 * getWidth(), and getHeight(). 8336 * 8337 * @param outRect The (scrolled) drawing bounds of the view. 8338 */ 8339 public void getDrawingRect(Rect outRect) { 8340 outRect.left = mScrollX; 8341 outRect.top = mScrollY; 8342 outRect.right = mScrollX + (mRight - mLeft); 8343 outRect.bottom = mScrollY + (mBottom - mTop); 8344 } 8345 8346 /** 8347 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8348 * raw width component (that is the result is masked by 8349 * {@link #MEASURED_SIZE_MASK}). 8350 * 8351 * @return The raw measured width of this view. 8352 */ 8353 public final int getMeasuredWidth() { 8354 return mMeasuredWidth & MEASURED_SIZE_MASK; 8355 } 8356 8357 /** 8358 * Return the full width measurement information for this view as computed 8359 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8360 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8361 * This should be used during measurement and layout calculations only. Use 8362 * {@link #getWidth()} to see how wide a view is after layout. 8363 * 8364 * @return The measured width of this view as a bit mask. 8365 */ 8366 public final int getMeasuredWidthAndState() { 8367 return mMeasuredWidth; 8368 } 8369 8370 /** 8371 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8372 * raw width component (that is the result is masked by 8373 * {@link #MEASURED_SIZE_MASK}). 8374 * 8375 * @return The raw measured height of this view. 8376 */ 8377 public final int getMeasuredHeight() { 8378 return mMeasuredHeight & MEASURED_SIZE_MASK; 8379 } 8380 8381 /** 8382 * Return the full height measurement information for this view as computed 8383 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8384 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8385 * This should be used during measurement and layout calculations only. Use 8386 * {@link #getHeight()} to see how wide a view is after layout. 8387 * 8388 * @return The measured width of this view as a bit mask. 8389 */ 8390 public final int getMeasuredHeightAndState() { 8391 return mMeasuredHeight; 8392 } 8393 8394 /** 8395 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8396 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8397 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8398 * and the height component is at the shifted bits 8399 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8400 */ 8401 public final int getMeasuredState() { 8402 return (mMeasuredWidth&MEASURED_STATE_MASK) 8403 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8404 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8405 } 8406 8407 /** 8408 * The transform matrix of this view, which is calculated based on the current 8409 * roation, scale, and pivot properties. 8410 * 8411 * @see #getRotation() 8412 * @see #getScaleX() 8413 * @see #getScaleY() 8414 * @see #getPivotX() 8415 * @see #getPivotY() 8416 * @return The current transform matrix for the view 8417 */ 8418 public Matrix getMatrix() { 8419 if (mTransformationInfo != null) { 8420 updateMatrix(); 8421 return mTransformationInfo.mMatrix; 8422 } 8423 return Matrix.IDENTITY_MATRIX; 8424 } 8425 8426 /** 8427 * Utility function to determine if the value is far enough away from zero to be 8428 * considered non-zero. 8429 * @param value A floating point value to check for zero-ness 8430 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8431 */ 8432 private static boolean nonzero(float value) { 8433 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8434 } 8435 8436 /** 8437 * Returns true if the transform matrix is the identity matrix. 8438 * Recomputes the matrix if necessary. 8439 * 8440 * @return True if the transform matrix is the identity matrix, false otherwise. 8441 */ 8442 final boolean hasIdentityMatrix() { 8443 if (mTransformationInfo != null) { 8444 updateMatrix(); 8445 return mTransformationInfo.mMatrixIsIdentity; 8446 } 8447 return true; 8448 } 8449 8450 void ensureTransformationInfo() { 8451 if (mTransformationInfo == null) { 8452 mTransformationInfo = new TransformationInfo(); 8453 } 8454 } 8455 8456 /** 8457 * Recomputes the transform matrix if necessary. 8458 */ 8459 private void updateMatrix() { 8460 final TransformationInfo info = mTransformationInfo; 8461 if (info == null) { 8462 return; 8463 } 8464 if (info.mMatrixDirty) { 8465 // transform-related properties have changed since the last time someone 8466 // asked for the matrix; recalculate it with the current values 8467 8468 // Figure out if we need to update the pivot point 8469 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8470 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8471 info.mPrevWidth = mRight - mLeft; 8472 info.mPrevHeight = mBottom - mTop; 8473 info.mPivotX = info.mPrevWidth / 2f; 8474 info.mPivotY = info.mPrevHeight / 2f; 8475 } 8476 } 8477 info.mMatrix.reset(); 8478 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8479 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8480 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8481 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8482 } else { 8483 if (info.mCamera == null) { 8484 info.mCamera = new Camera(); 8485 info.matrix3D = new Matrix(); 8486 } 8487 info.mCamera.save(); 8488 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8489 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8490 info.mCamera.getMatrix(info.matrix3D); 8491 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8492 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8493 info.mPivotY + info.mTranslationY); 8494 info.mMatrix.postConcat(info.matrix3D); 8495 info.mCamera.restore(); 8496 } 8497 info.mMatrixDirty = false; 8498 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8499 info.mInverseMatrixDirty = true; 8500 } 8501 } 8502 8503 /** 8504 * Utility method to retrieve the inverse of the current mMatrix property. 8505 * We cache the matrix to avoid recalculating it when transform properties 8506 * have not changed. 8507 * 8508 * @return The inverse of the current matrix of this view. 8509 */ 8510 final Matrix getInverseMatrix() { 8511 final TransformationInfo info = mTransformationInfo; 8512 if (info != null) { 8513 updateMatrix(); 8514 if (info.mInverseMatrixDirty) { 8515 if (info.mInverseMatrix == null) { 8516 info.mInverseMatrix = new Matrix(); 8517 } 8518 info.mMatrix.invert(info.mInverseMatrix); 8519 info.mInverseMatrixDirty = false; 8520 } 8521 return info.mInverseMatrix; 8522 } 8523 return Matrix.IDENTITY_MATRIX; 8524 } 8525 8526 /** 8527 * Gets the distance along the Z axis from the camera to this view. 8528 * 8529 * @see #setCameraDistance(float) 8530 * 8531 * @return The distance along the Z axis. 8532 */ 8533 public float getCameraDistance() { 8534 ensureTransformationInfo(); 8535 final float dpi = mResources.getDisplayMetrics().densityDpi; 8536 final TransformationInfo info = mTransformationInfo; 8537 if (info.mCamera == null) { 8538 info.mCamera = new Camera(); 8539 info.matrix3D = new Matrix(); 8540 } 8541 return -(info.mCamera.getLocationZ() * dpi); 8542 } 8543 8544 /** 8545 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8546 * views are drawn) from the camera to this view. The camera's distance 8547 * affects 3D transformations, for instance rotations around the X and Y 8548 * axis. If the rotationX or rotationY properties are changed and this view is 8549 * large (more than half the size of the screen), it is recommended to always 8550 * use a camera distance that's greater than the height (X axis rotation) or 8551 * the width (Y axis rotation) of this view.</p> 8552 * 8553 * <p>The distance of the camera from the view plane can have an affect on the 8554 * perspective distortion of the view when it is rotated around the x or y axis. 8555 * For example, a large distance will result in a large viewing angle, and there 8556 * will not be much perspective distortion of the view as it rotates. A short 8557 * distance may cause much more perspective distortion upon rotation, and can 8558 * also result in some drawing artifacts if the rotated view ends up partially 8559 * behind the camera (which is why the recommendation is to use a distance at 8560 * least as far as the size of the view, if the view is to be rotated.)</p> 8561 * 8562 * <p>The distance is expressed in "depth pixels." The default distance depends 8563 * on the screen density. For instance, on a medium density display, the 8564 * default distance is 1280. On a high density display, the default distance 8565 * is 1920.</p> 8566 * 8567 * <p>If you want to specify a distance that leads to visually consistent 8568 * results across various densities, use the following formula:</p> 8569 * <pre> 8570 * float scale = context.getResources().getDisplayMetrics().density; 8571 * view.setCameraDistance(distance * scale); 8572 * </pre> 8573 * 8574 * <p>The density scale factor of a high density display is 1.5, 8575 * and 1920 = 1280 * 1.5.</p> 8576 * 8577 * @param distance The distance in "depth pixels", if negative the opposite 8578 * value is used 8579 * 8580 * @see #setRotationX(float) 8581 * @see #setRotationY(float) 8582 */ 8583 public void setCameraDistance(float distance) { 8584 invalidateViewProperty(true, false); 8585 8586 ensureTransformationInfo(); 8587 final float dpi = mResources.getDisplayMetrics().densityDpi; 8588 final TransformationInfo info = mTransformationInfo; 8589 if (info.mCamera == null) { 8590 info.mCamera = new Camera(); 8591 info.matrix3D = new Matrix(); 8592 } 8593 8594 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8595 info.mMatrixDirty = true; 8596 8597 invalidateViewProperty(false, false); 8598 if (mDisplayList != null) { 8599 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8600 } 8601 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8602 // View was rejected last time it was drawn by its parent; this may have changed 8603 invalidateParentIfNeeded(); 8604 } 8605 } 8606 8607 /** 8608 * The degrees that the view is rotated around the pivot point. 8609 * 8610 * @see #setRotation(float) 8611 * @see #getPivotX() 8612 * @see #getPivotY() 8613 * 8614 * @return The degrees of rotation. 8615 */ 8616 @ViewDebug.ExportedProperty(category = "drawing") 8617 public float getRotation() { 8618 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8619 } 8620 8621 /** 8622 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8623 * result in clockwise rotation. 8624 * 8625 * @param rotation The degrees of rotation. 8626 * 8627 * @see #getRotation() 8628 * @see #getPivotX() 8629 * @see #getPivotY() 8630 * @see #setRotationX(float) 8631 * @see #setRotationY(float) 8632 * 8633 * @attr ref android.R.styleable#View_rotation 8634 */ 8635 public void setRotation(float rotation) { 8636 ensureTransformationInfo(); 8637 final TransformationInfo info = mTransformationInfo; 8638 if (info.mRotation != rotation) { 8639 // Double-invalidation is necessary to capture view's old and new areas 8640 invalidateViewProperty(true, false); 8641 info.mRotation = rotation; 8642 info.mMatrixDirty = true; 8643 invalidateViewProperty(false, true); 8644 if (mDisplayList != null) { 8645 mDisplayList.setRotation(rotation); 8646 } 8647 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8648 // View was rejected last time it was drawn by its parent; this may have changed 8649 invalidateParentIfNeeded(); 8650 } 8651 } 8652 } 8653 8654 /** 8655 * The degrees that the view is rotated around the vertical axis through the pivot point. 8656 * 8657 * @see #getPivotX() 8658 * @see #getPivotY() 8659 * @see #setRotationY(float) 8660 * 8661 * @return The degrees of Y rotation. 8662 */ 8663 @ViewDebug.ExportedProperty(category = "drawing") 8664 public float getRotationY() { 8665 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8666 } 8667 8668 /** 8669 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8670 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8671 * down the y axis. 8672 * 8673 * When rotating large views, it is recommended to adjust the camera distance 8674 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8675 * 8676 * @param rotationY The degrees of Y rotation. 8677 * 8678 * @see #getRotationY() 8679 * @see #getPivotX() 8680 * @see #getPivotY() 8681 * @see #setRotation(float) 8682 * @see #setRotationX(float) 8683 * @see #setCameraDistance(float) 8684 * 8685 * @attr ref android.R.styleable#View_rotationY 8686 */ 8687 public void setRotationY(float rotationY) { 8688 ensureTransformationInfo(); 8689 final TransformationInfo info = mTransformationInfo; 8690 if (info.mRotationY != rotationY) { 8691 invalidateViewProperty(true, false); 8692 info.mRotationY = rotationY; 8693 info.mMatrixDirty = true; 8694 invalidateViewProperty(false, true); 8695 if (mDisplayList != null) { 8696 mDisplayList.setRotationY(rotationY); 8697 } 8698 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8699 // View was rejected last time it was drawn by its parent; this may have changed 8700 invalidateParentIfNeeded(); 8701 } 8702 } 8703 } 8704 8705 /** 8706 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8707 * 8708 * @see #getPivotX() 8709 * @see #getPivotY() 8710 * @see #setRotationX(float) 8711 * 8712 * @return The degrees of X rotation. 8713 */ 8714 @ViewDebug.ExportedProperty(category = "drawing") 8715 public float getRotationX() { 8716 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8717 } 8718 8719 /** 8720 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8721 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8722 * x axis. 8723 * 8724 * When rotating large views, it is recommended to adjust the camera distance 8725 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8726 * 8727 * @param rotationX The degrees of X rotation. 8728 * 8729 * @see #getRotationX() 8730 * @see #getPivotX() 8731 * @see #getPivotY() 8732 * @see #setRotation(float) 8733 * @see #setRotationY(float) 8734 * @see #setCameraDistance(float) 8735 * 8736 * @attr ref android.R.styleable#View_rotationX 8737 */ 8738 public void setRotationX(float rotationX) { 8739 ensureTransformationInfo(); 8740 final TransformationInfo info = mTransformationInfo; 8741 if (info.mRotationX != rotationX) { 8742 invalidateViewProperty(true, false); 8743 info.mRotationX = rotationX; 8744 info.mMatrixDirty = true; 8745 invalidateViewProperty(false, true); 8746 if (mDisplayList != null) { 8747 mDisplayList.setRotationX(rotationX); 8748 } 8749 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8750 // View was rejected last time it was drawn by its parent; this may have changed 8751 invalidateParentIfNeeded(); 8752 } 8753 } 8754 } 8755 8756 /** 8757 * The amount that the view is scaled in x around the pivot point, as a proportion of 8758 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8759 * 8760 * <p>By default, this is 1.0f. 8761 * 8762 * @see #getPivotX() 8763 * @see #getPivotY() 8764 * @return The scaling factor. 8765 */ 8766 @ViewDebug.ExportedProperty(category = "drawing") 8767 public float getScaleX() { 8768 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8769 } 8770 8771 /** 8772 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8773 * the view's unscaled width. A value of 1 means that no scaling is applied. 8774 * 8775 * @param scaleX The scaling factor. 8776 * @see #getPivotX() 8777 * @see #getPivotY() 8778 * 8779 * @attr ref android.R.styleable#View_scaleX 8780 */ 8781 public void setScaleX(float scaleX) { 8782 ensureTransformationInfo(); 8783 final TransformationInfo info = mTransformationInfo; 8784 if (info.mScaleX != scaleX) { 8785 invalidateViewProperty(true, false); 8786 info.mScaleX = scaleX; 8787 info.mMatrixDirty = true; 8788 invalidateViewProperty(false, true); 8789 if (mDisplayList != null) { 8790 mDisplayList.setScaleX(scaleX); 8791 } 8792 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8793 // View was rejected last time it was drawn by its parent; this may have changed 8794 invalidateParentIfNeeded(); 8795 } 8796 } 8797 } 8798 8799 /** 8800 * The amount that the view is scaled in y around the pivot point, as a proportion of 8801 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8802 * 8803 * <p>By default, this is 1.0f. 8804 * 8805 * @see #getPivotX() 8806 * @see #getPivotY() 8807 * @return The scaling factor. 8808 */ 8809 @ViewDebug.ExportedProperty(category = "drawing") 8810 public float getScaleY() { 8811 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8812 } 8813 8814 /** 8815 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8816 * the view's unscaled width. A value of 1 means that no scaling is applied. 8817 * 8818 * @param scaleY The scaling factor. 8819 * @see #getPivotX() 8820 * @see #getPivotY() 8821 * 8822 * @attr ref android.R.styleable#View_scaleY 8823 */ 8824 public void setScaleY(float scaleY) { 8825 ensureTransformationInfo(); 8826 final TransformationInfo info = mTransformationInfo; 8827 if (info.mScaleY != scaleY) { 8828 invalidateViewProperty(true, false); 8829 info.mScaleY = scaleY; 8830 info.mMatrixDirty = true; 8831 invalidateViewProperty(false, true); 8832 if (mDisplayList != null) { 8833 mDisplayList.setScaleY(scaleY); 8834 } 8835 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8836 // View was rejected last time it was drawn by its parent; this may have changed 8837 invalidateParentIfNeeded(); 8838 } 8839 } 8840 } 8841 8842 /** 8843 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8844 * and {@link #setScaleX(float) scaled}. 8845 * 8846 * @see #getRotation() 8847 * @see #getScaleX() 8848 * @see #getScaleY() 8849 * @see #getPivotY() 8850 * @return The x location of the pivot point. 8851 * 8852 * @attr ref android.R.styleable#View_transformPivotX 8853 */ 8854 @ViewDebug.ExportedProperty(category = "drawing") 8855 public float getPivotX() { 8856 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8857 } 8858 8859 /** 8860 * Sets the x location of the point around which the view is 8861 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8862 * By default, the pivot point is centered on the object. 8863 * Setting this property disables this behavior and causes the view to use only the 8864 * explicitly set pivotX and pivotY values. 8865 * 8866 * @param pivotX The x location of the pivot point. 8867 * @see #getRotation() 8868 * @see #getScaleX() 8869 * @see #getScaleY() 8870 * @see #getPivotY() 8871 * 8872 * @attr ref android.R.styleable#View_transformPivotX 8873 */ 8874 public void setPivotX(float pivotX) { 8875 ensureTransformationInfo(); 8876 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8877 final TransformationInfo info = mTransformationInfo; 8878 if (info.mPivotX != pivotX) { 8879 invalidateViewProperty(true, false); 8880 info.mPivotX = pivotX; 8881 info.mMatrixDirty = true; 8882 invalidateViewProperty(false, true); 8883 if (mDisplayList != null) { 8884 mDisplayList.setPivotX(pivotX); 8885 } 8886 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8887 // View was rejected last time it was drawn by its parent; this may have changed 8888 invalidateParentIfNeeded(); 8889 } 8890 } 8891 } 8892 8893 /** 8894 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8895 * and {@link #setScaleY(float) scaled}. 8896 * 8897 * @see #getRotation() 8898 * @see #getScaleX() 8899 * @see #getScaleY() 8900 * @see #getPivotY() 8901 * @return The y location of the pivot point. 8902 * 8903 * @attr ref android.R.styleable#View_transformPivotY 8904 */ 8905 @ViewDebug.ExportedProperty(category = "drawing") 8906 public float getPivotY() { 8907 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8908 } 8909 8910 /** 8911 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8912 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8913 * Setting this property disables this behavior and causes the view to use only the 8914 * explicitly set pivotX and pivotY values. 8915 * 8916 * @param pivotY The y location of the pivot point. 8917 * @see #getRotation() 8918 * @see #getScaleX() 8919 * @see #getScaleY() 8920 * @see #getPivotY() 8921 * 8922 * @attr ref android.R.styleable#View_transformPivotY 8923 */ 8924 public void setPivotY(float pivotY) { 8925 ensureTransformationInfo(); 8926 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8927 final TransformationInfo info = mTransformationInfo; 8928 if (info.mPivotY != pivotY) { 8929 invalidateViewProperty(true, false); 8930 info.mPivotY = pivotY; 8931 info.mMatrixDirty = true; 8932 invalidateViewProperty(false, true); 8933 if (mDisplayList != null) { 8934 mDisplayList.setPivotY(pivotY); 8935 } 8936 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8937 // View was rejected last time it was drawn by its parent; this may have changed 8938 invalidateParentIfNeeded(); 8939 } 8940 } 8941 } 8942 8943 /** 8944 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8945 * completely transparent and 1 means the view is completely opaque. 8946 * 8947 * <p>By default this is 1.0f. 8948 * @return The opacity of the view. 8949 */ 8950 @ViewDebug.ExportedProperty(category = "drawing") 8951 public float getAlpha() { 8952 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8953 } 8954 8955 /** 8956 * Returns whether this View has content which overlaps. This function, intended to be 8957 * overridden by specific View types, is an optimization when alpha is set on a view. If 8958 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8959 * and then composited it into place, which can be expensive. If the view has no overlapping 8960 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8961 * An example of overlapping rendering is a TextView with a background image, such as a 8962 * Button. An example of non-overlapping rendering is a TextView with no background, or 8963 * an ImageView with only the foreground image. The default implementation returns true; 8964 * subclasses should override if they have cases which can be optimized. 8965 * 8966 * @return true if the content in this view might overlap, false otherwise. 8967 */ 8968 public boolean hasOverlappingRendering() { 8969 return true; 8970 } 8971 8972 /** 8973 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8974 * completely transparent and 1 means the view is completely opaque.</p> 8975 * 8976 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8977 * responsible for applying the opacity itself. Otherwise, calling this method is 8978 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8979 * setting a hardware layer.</p> 8980 * 8981 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8982 * performance implications. It is generally best to use the alpha property sparingly and 8983 * transiently, as in the case of fading animations.</p> 8984 * 8985 * @param alpha The opacity of the view. 8986 * 8987 * @see #setLayerType(int, android.graphics.Paint) 8988 * 8989 * @attr ref android.R.styleable#View_alpha 8990 */ 8991 public void setAlpha(float alpha) { 8992 ensureTransformationInfo(); 8993 if (mTransformationInfo.mAlpha != alpha) { 8994 mTransformationInfo.mAlpha = alpha; 8995 if (onSetAlpha((int) (alpha * 255))) { 8996 mPrivateFlags |= ALPHA_SET; 8997 // subclass is handling alpha - don't optimize rendering cache invalidation 8998 invalidateParentCaches(); 8999 invalidate(true); 9000 } else { 9001 mPrivateFlags &= ~ALPHA_SET; 9002 invalidateViewProperty(true, false); 9003 if (mDisplayList != null) { 9004 mDisplayList.setAlpha(alpha); 9005 } 9006 } 9007 } 9008 } 9009 9010 /** 9011 * Faster version of setAlpha() which performs the same steps except there are 9012 * no calls to invalidate(). The caller of this function should perform proper invalidation 9013 * on the parent and this object. The return value indicates whether the subclass handles 9014 * alpha (the return value for onSetAlpha()). 9015 * 9016 * @param alpha The new value for the alpha property 9017 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9018 * the new value for the alpha property is different from the old value 9019 */ 9020 boolean setAlphaNoInvalidation(float alpha) { 9021 ensureTransformationInfo(); 9022 if (mTransformationInfo.mAlpha != alpha) { 9023 mTransformationInfo.mAlpha = alpha; 9024 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9025 if (subclassHandlesAlpha) { 9026 mPrivateFlags |= ALPHA_SET; 9027 return true; 9028 } else { 9029 mPrivateFlags &= ~ALPHA_SET; 9030 if (mDisplayList != null) { 9031 mDisplayList.setAlpha(alpha); 9032 } 9033 } 9034 } 9035 return false; 9036 } 9037 9038 /** 9039 * Top position of this view relative to its parent. 9040 * 9041 * @return The top of this view, in pixels. 9042 */ 9043 @ViewDebug.CapturedViewProperty 9044 public final int getTop() { 9045 return mTop; 9046 } 9047 9048 /** 9049 * Sets the top position of this view relative to its parent. This method is meant to be called 9050 * by the layout system and should not generally be called otherwise, because the property 9051 * may be changed at any time by the layout. 9052 * 9053 * @param top The top of this view, in pixels. 9054 */ 9055 public final void setTop(int top) { 9056 if (top != mTop) { 9057 updateMatrix(); 9058 final boolean matrixIsIdentity = mTransformationInfo == null 9059 || mTransformationInfo.mMatrixIsIdentity; 9060 if (matrixIsIdentity) { 9061 if (mAttachInfo != null) { 9062 int minTop; 9063 int yLoc; 9064 if (top < mTop) { 9065 minTop = top; 9066 yLoc = top - mTop; 9067 } else { 9068 minTop = mTop; 9069 yLoc = 0; 9070 } 9071 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9072 } 9073 } else { 9074 // Double-invalidation is necessary to capture view's old and new areas 9075 invalidate(true); 9076 } 9077 9078 int width = mRight - mLeft; 9079 int oldHeight = mBottom - mTop; 9080 9081 mTop = top; 9082 if (mDisplayList != null) { 9083 mDisplayList.setTop(mTop); 9084 } 9085 9086 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9087 9088 if (!matrixIsIdentity) { 9089 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9090 // A change in dimension means an auto-centered pivot point changes, too 9091 mTransformationInfo.mMatrixDirty = true; 9092 } 9093 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9094 invalidate(true); 9095 } 9096 mBackgroundSizeChanged = true; 9097 invalidateParentIfNeeded(); 9098 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9099 // View was rejected last time it was drawn by its parent; this may have changed 9100 invalidateParentIfNeeded(); 9101 } 9102 } 9103 } 9104 9105 /** 9106 * Bottom position of this view relative to its parent. 9107 * 9108 * @return The bottom of this view, in pixels. 9109 */ 9110 @ViewDebug.CapturedViewProperty 9111 public final int getBottom() { 9112 return mBottom; 9113 } 9114 9115 /** 9116 * True if this view has changed since the last time being drawn. 9117 * 9118 * @return The dirty state of this view. 9119 */ 9120 public boolean isDirty() { 9121 return (mPrivateFlags & DIRTY_MASK) != 0; 9122 } 9123 9124 /** 9125 * Sets the bottom position of this view relative to its parent. This method is meant to be 9126 * called by the layout system and should not generally be called otherwise, because the 9127 * property may be changed at any time by the layout. 9128 * 9129 * @param bottom The bottom of this view, in pixels. 9130 */ 9131 public final void setBottom(int bottom) { 9132 if (bottom != mBottom) { 9133 updateMatrix(); 9134 final boolean matrixIsIdentity = mTransformationInfo == null 9135 || mTransformationInfo.mMatrixIsIdentity; 9136 if (matrixIsIdentity) { 9137 if (mAttachInfo != null) { 9138 int maxBottom; 9139 if (bottom < mBottom) { 9140 maxBottom = mBottom; 9141 } else { 9142 maxBottom = bottom; 9143 } 9144 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9145 } 9146 } else { 9147 // Double-invalidation is necessary to capture view's old and new areas 9148 invalidate(true); 9149 } 9150 9151 int width = mRight - mLeft; 9152 int oldHeight = mBottom - mTop; 9153 9154 mBottom = bottom; 9155 if (mDisplayList != null) { 9156 mDisplayList.setBottom(mBottom); 9157 } 9158 9159 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9160 9161 if (!matrixIsIdentity) { 9162 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9163 // A change in dimension means an auto-centered pivot point changes, too 9164 mTransformationInfo.mMatrixDirty = true; 9165 } 9166 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9167 invalidate(true); 9168 } 9169 mBackgroundSizeChanged = true; 9170 invalidateParentIfNeeded(); 9171 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9172 // View was rejected last time it was drawn by its parent; this may have changed 9173 invalidateParentIfNeeded(); 9174 } 9175 } 9176 } 9177 9178 /** 9179 * Left position of this view relative to its parent. 9180 * 9181 * @return The left edge of this view, in pixels. 9182 */ 9183 @ViewDebug.CapturedViewProperty 9184 public final int getLeft() { 9185 return mLeft; 9186 } 9187 9188 /** 9189 * Sets the left position of this view relative to its parent. This method is meant to be called 9190 * by the layout system and should not generally be called otherwise, because the property 9191 * may be changed at any time by the layout. 9192 * 9193 * @param left The bottom of this view, in pixels. 9194 */ 9195 public final void setLeft(int left) { 9196 if (left != mLeft) { 9197 updateMatrix(); 9198 final boolean matrixIsIdentity = mTransformationInfo == null 9199 || mTransformationInfo.mMatrixIsIdentity; 9200 if (matrixIsIdentity) { 9201 if (mAttachInfo != null) { 9202 int minLeft; 9203 int xLoc; 9204 if (left < mLeft) { 9205 minLeft = left; 9206 xLoc = left - mLeft; 9207 } else { 9208 minLeft = mLeft; 9209 xLoc = 0; 9210 } 9211 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9212 } 9213 } else { 9214 // Double-invalidation is necessary to capture view's old and new areas 9215 invalidate(true); 9216 } 9217 9218 int oldWidth = mRight - mLeft; 9219 int height = mBottom - mTop; 9220 9221 mLeft = left; 9222 if (mDisplayList != null) { 9223 mDisplayList.setLeft(left); 9224 } 9225 9226 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9227 9228 if (!matrixIsIdentity) { 9229 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9230 // A change in dimension means an auto-centered pivot point changes, too 9231 mTransformationInfo.mMatrixDirty = true; 9232 } 9233 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9234 invalidate(true); 9235 } 9236 mBackgroundSizeChanged = true; 9237 invalidateParentIfNeeded(); 9238 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9239 // View was rejected last time it was drawn by its parent; this may have changed 9240 invalidateParentIfNeeded(); 9241 } 9242 } 9243 } 9244 9245 /** 9246 * Right position of this view relative to its parent. 9247 * 9248 * @return The right edge of this view, in pixels. 9249 */ 9250 @ViewDebug.CapturedViewProperty 9251 public final int getRight() { 9252 return mRight; 9253 } 9254 9255 /** 9256 * Sets the right position of this view relative to its parent. This method is meant to be called 9257 * by the layout system and should not generally be called otherwise, because the property 9258 * may be changed at any time by the layout. 9259 * 9260 * @param right The bottom of this view, in pixels. 9261 */ 9262 public final void setRight(int right) { 9263 if (right != mRight) { 9264 updateMatrix(); 9265 final boolean matrixIsIdentity = mTransformationInfo == null 9266 || mTransformationInfo.mMatrixIsIdentity; 9267 if (matrixIsIdentity) { 9268 if (mAttachInfo != null) { 9269 int maxRight; 9270 if (right < mRight) { 9271 maxRight = mRight; 9272 } else { 9273 maxRight = right; 9274 } 9275 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9276 } 9277 } else { 9278 // Double-invalidation is necessary to capture view's old and new areas 9279 invalidate(true); 9280 } 9281 9282 int oldWidth = mRight - mLeft; 9283 int height = mBottom - mTop; 9284 9285 mRight = right; 9286 if (mDisplayList != null) { 9287 mDisplayList.setRight(mRight); 9288 } 9289 9290 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9291 9292 if (!matrixIsIdentity) { 9293 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9294 // A change in dimension means an auto-centered pivot point changes, too 9295 mTransformationInfo.mMatrixDirty = true; 9296 } 9297 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9298 invalidate(true); 9299 } 9300 mBackgroundSizeChanged = true; 9301 invalidateParentIfNeeded(); 9302 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9303 // View was rejected last time it was drawn by its parent; this may have changed 9304 invalidateParentIfNeeded(); 9305 } 9306 } 9307 } 9308 9309 /** 9310 * The visual x position of this view, in pixels. This is equivalent to the 9311 * {@link #setTranslationX(float) translationX} property plus the current 9312 * {@link #getLeft() left} property. 9313 * 9314 * @return The visual x position of this view, in pixels. 9315 */ 9316 @ViewDebug.ExportedProperty(category = "drawing") 9317 public float getX() { 9318 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9319 } 9320 9321 /** 9322 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9323 * {@link #setTranslationX(float) translationX} property to be the difference between 9324 * the x value passed in and the current {@link #getLeft() left} property. 9325 * 9326 * @param x The visual x position of this view, in pixels. 9327 */ 9328 public void setX(float x) { 9329 setTranslationX(x - mLeft); 9330 } 9331 9332 /** 9333 * The visual y position of this view, in pixels. This is equivalent to the 9334 * {@link #setTranslationY(float) translationY} property plus the current 9335 * {@link #getTop() top} property. 9336 * 9337 * @return The visual y position of this view, in pixels. 9338 */ 9339 @ViewDebug.ExportedProperty(category = "drawing") 9340 public float getY() { 9341 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9342 } 9343 9344 /** 9345 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9346 * {@link #setTranslationY(float) translationY} property to be the difference between 9347 * the y value passed in and the current {@link #getTop() top} property. 9348 * 9349 * @param y The visual y position of this view, in pixels. 9350 */ 9351 public void setY(float y) { 9352 setTranslationY(y - mTop); 9353 } 9354 9355 9356 /** 9357 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9358 * This position is post-layout, in addition to wherever the object's 9359 * layout placed it. 9360 * 9361 * @return The horizontal position of this view relative to its left position, in pixels. 9362 */ 9363 @ViewDebug.ExportedProperty(category = "drawing") 9364 public float getTranslationX() { 9365 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9366 } 9367 9368 /** 9369 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9370 * This effectively positions the object post-layout, in addition to wherever the object's 9371 * layout placed it. 9372 * 9373 * @param translationX The horizontal position of this view relative to its left position, 9374 * in pixels. 9375 * 9376 * @attr ref android.R.styleable#View_translationX 9377 */ 9378 public void setTranslationX(float translationX) { 9379 ensureTransformationInfo(); 9380 final TransformationInfo info = mTransformationInfo; 9381 if (info.mTranslationX != translationX) { 9382 // Double-invalidation is necessary to capture view's old and new areas 9383 invalidateViewProperty(true, false); 9384 info.mTranslationX = translationX; 9385 info.mMatrixDirty = true; 9386 invalidateViewProperty(false, true); 9387 if (mDisplayList != null) { 9388 mDisplayList.setTranslationX(translationX); 9389 } 9390 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9391 // View was rejected last time it was drawn by its parent; this may have changed 9392 invalidateParentIfNeeded(); 9393 } 9394 } 9395 } 9396 9397 /** 9398 * The horizontal location of this view relative to its {@link #getTop() top} position. 9399 * This position is post-layout, in addition to wherever the object's 9400 * layout placed it. 9401 * 9402 * @return The vertical position of this view relative to its top position, 9403 * in pixels. 9404 */ 9405 @ViewDebug.ExportedProperty(category = "drawing") 9406 public float getTranslationY() { 9407 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9408 } 9409 9410 /** 9411 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9412 * This effectively positions the object post-layout, in addition to wherever the object's 9413 * layout placed it. 9414 * 9415 * @param translationY The vertical position of this view relative to its top position, 9416 * in pixels. 9417 * 9418 * @attr ref android.R.styleable#View_translationY 9419 */ 9420 public void setTranslationY(float translationY) { 9421 ensureTransformationInfo(); 9422 final TransformationInfo info = mTransformationInfo; 9423 if (info.mTranslationY != translationY) { 9424 invalidateViewProperty(true, false); 9425 info.mTranslationY = translationY; 9426 info.mMatrixDirty = true; 9427 invalidateViewProperty(false, true); 9428 if (mDisplayList != null) { 9429 mDisplayList.setTranslationY(translationY); 9430 } 9431 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9432 // View was rejected last time it was drawn by its parent; this may have changed 9433 invalidateParentIfNeeded(); 9434 } 9435 } 9436 } 9437 9438 /** 9439 * Hit rectangle in parent's coordinates 9440 * 9441 * @param outRect The hit rectangle of the view. 9442 */ 9443 public void getHitRect(Rect outRect) { 9444 updateMatrix(); 9445 final TransformationInfo info = mTransformationInfo; 9446 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9447 outRect.set(mLeft, mTop, mRight, mBottom); 9448 } else { 9449 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9450 tmpRect.set(-info.mPivotX, -info.mPivotY, 9451 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9452 info.mMatrix.mapRect(tmpRect); 9453 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9454 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9455 } 9456 } 9457 9458 /** 9459 * Determines whether the given point, in local coordinates is inside the view. 9460 */ 9461 /*package*/ final boolean pointInView(float localX, float localY) { 9462 return localX >= 0 && localX < (mRight - mLeft) 9463 && localY >= 0 && localY < (mBottom - mTop); 9464 } 9465 9466 /** 9467 * Utility method to determine whether the given point, in local coordinates, 9468 * is inside the view, where the area of the view is expanded by the slop factor. 9469 * This method is called while processing touch-move events to determine if the event 9470 * is still within the view. 9471 */ 9472 private boolean pointInView(float localX, float localY, float slop) { 9473 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9474 localY < ((mBottom - mTop) + slop); 9475 } 9476 9477 /** 9478 * When a view has focus and the user navigates away from it, the next view is searched for 9479 * starting from the rectangle filled in by this method. 9480 * 9481 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9482 * of the view. However, if your view maintains some idea of internal selection, 9483 * such as a cursor, or a selected row or column, you should override this method and 9484 * fill in a more specific rectangle. 9485 * 9486 * @param r The rectangle to fill in, in this view's coordinates. 9487 */ 9488 public void getFocusedRect(Rect r) { 9489 getDrawingRect(r); 9490 } 9491 9492 /** 9493 * If some part of this view is not clipped by any of its parents, then 9494 * return that area in r in global (root) coordinates. To convert r to local 9495 * coordinates (without taking possible View rotations into account), offset 9496 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9497 * If the view is completely clipped or translated out, return false. 9498 * 9499 * @param r If true is returned, r holds the global coordinates of the 9500 * visible portion of this view. 9501 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9502 * between this view and its root. globalOffet may be null. 9503 * @return true if r is non-empty (i.e. part of the view is visible at the 9504 * root level. 9505 */ 9506 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9507 int width = mRight - mLeft; 9508 int height = mBottom - mTop; 9509 if (width > 0 && height > 0) { 9510 r.set(0, 0, width, height); 9511 if (globalOffset != null) { 9512 globalOffset.set(-mScrollX, -mScrollY); 9513 } 9514 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9515 } 9516 return false; 9517 } 9518 9519 public final boolean getGlobalVisibleRect(Rect r) { 9520 return getGlobalVisibleRect(r, null); 9521 } 9522 9523 public final boolean getLocalVisibleRect(Rect r) { 9524 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9525 if (getGlobalVisibleRect(r, offset)) { 9526 r.offset(-offset.x, -offset.y); // make r local 9527 return true; 9528 } 9529 return false; 9530 } 9531 9532 /** 9533 * Offset this view's vertical location by the specified number of pixels. 9534 * 9535 * @param offset the number of pixels to offset the view by 9536 */ 9537 public void offsetTopAndBottom(int offset) { 9538 if (offset != 0) { 9539 updateMatrix(); 9540 final boolean matrixIsIdentity = mTransformationInfo == null 9541 || mTransformationInfo.mMatrixIsIdentity; 9542 if (matrixIsIdentity) { 9543 if (mDisplayList != null) { 9544 invalidateViewProperty(false, false); 9545 } else { 9546 final ViewParent p = mParent; 9547 if (p != null && mAttachInfo != null) { 9548 final Rect r = mAttachInfo.mTmpInvalRect; 9549 int minTop; 9550 int maxBottom; 9551 int yLoc; 9552 if (offset < 0) { 9553 minTop = mTop + offset; 9554 maxBottom = mBottom; 9555 yLoc = offset; 9556 } else { 9557 minTop = mTop; 9558 maxBottom = mBottom + offset; 9559 yLoc = 0; 9560 } 9561 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9562 p.invalidateChild(this, r); 9563 } 9564 } 9565 } else { 9566 invalidateViewProperty(false, false); 9567 } 9568 9569 mTop += offset; 9570 mBottom += offset; 9571 if (mDisplayList != null) { 9572 mDisplayList.offsetTopBottom(offset); 9573 invalidateViewProperty(false, false); 9574 } else { 9575 if (!matrixIsIdentity) { 9576 invalidateViewProperty(false, true); 9577 } 9578 invalidateParentIfNeeded(); 9579 } 9580 } 9581 } 9582 9583 /** 9584 * Offset this view's horizontal location by the specified amount of pixels. 9585 * 9586 * @param offset the numer of pixels to offset the view by 9587 */ 9588 public void offsetLeftAndRight(int offset) { 9589 if (offset != 0) { 9590 updateMatrix(); 9591 final boolean matrixIsIdentity = mTransformationInfo == null 9592 || mTransformationInfo.mMatrixIsIdentity; 9593 if (matrixIsIdentity) { 9594 if (mDisplayList != null) { 9595 invalidateViewProperty(false, false); 9596 } else { 9597 final ViewParent p = mParent; 9598 if (p != null && mAttachInfo != null) { 9599 final Rect r = mAttachInfo.mTmpInvalRect; 9600 int minLeft; 9601 int maxRight; 9602 if (offset < 0) { 9603 minLeft = mLeft + offset; 9604 maxRight = mRight; 9605 } else { 9606 minLeft = mLeft; 9607 maxRight = mRight + offset; 9608 } 9609 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9610 p.invalidateChild(this, r); 9611 } 9612 } 9613 } else { 9614 invalidateViewProperty(false, false); 9615 } 9616 9617 mLeft += offset; 9618 mRight += offset; 9619 if (mDisplayList != null) { 9620 mDisplayList.offsetLeftRight(offset); 9621 invalidateViewProperty(false, false); 9622 } else { 9623 if (!matrixIsIdentity) { 9624 invalidateViewProperty(false, true); 9625 } 9626 invalidateParentIfNeeded(); 9627 } 9628 } 9629 } 9630 9631 /** 9632 * Get the LayoutParams associated with this view. All views should have 9633 * layout parameters. These supply parameters to the <i>parent</i> of this 9634 * view specifying how it should be arranged. There are many subclasses of 9635 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9636 * of ViewGroup that are responsible for arranging their children. 9637 * 9638 * This method may return null if this View is not attached to a parent 9639 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9640 * was not invoked successfully. When a View is attached to a parent 9641 * ViewGroup, this method must not return null. 9642 * 9643 * @return The LayoutParams associated with this view, or null if no 9644 * parameters have been set yet 9645 */ 9646 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9647 public ViewGroup.LayoutParams getLayoutParams() { 9648 return mLayoutParams; 9649 } 9650 9651 /** 9652 * Set the layout parameters associated with this view. These supply 9653 * parameters to the <i>parent</i> of this view specifying how it should be 9654 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9655 * correspond to the different subclasses of ViewGroup that are responsible 9656 * for arranging their children. 9657 * 9658 * @param params The layout parameters for this view, cannot be null 9659 */ 9660 public void setLayoutParams(ViewGroup.LayoutParams params) { 9661 if (params == null) { 9662 throw new NullPointerException("Layout parameters cannot be null"); 9663 } 9664 mLayoutParams = params; 9665 if (mParent instanceof ViewGroup) { 9666 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9667 } 9668 requestLayout(); 9669 } 9670 9671 /** 9672 * Set the scrolled position of your view. This will cause a call to 9673 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9674 * invalidated. 9675 * @param x the x position to scroll to 9676 * @param y the y position to scroll to 9677 */ 9678 public void scrollTo(int x, int y) { 9679 if (mScrollX != x || mScrollY != y) { 9680 int oldX = mScrollX; 9681 int oldY = mScrollY; 9682 mScrollX = x; 9683 mScrollY = y; 9684 invalidateParentCaches(); 9685 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9686 if (!awakenScrollBars()) { 9687 postInvalidateOnAnimation(); 9688 } 9689 } 9690 } 9691 9692 /** 9693 * Move the scrolled position of your view. This will cause a call to 9694 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9695 * invalidated. 9696 * @param x the amount of pixels to scroll by horizontally 9697 * @param y the amount of pixels to scroll by vertically 9698 */ 9699 public void scrollBy(int x, int y) { 9700 scrollTo(mScrollX + x, mScrollY + y); 9701 } 9702 9703 /** 9704 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9705 * animation to fade the scrollbars out after a default delay. If a subclass 9706 * provides animated scrolling, the start delay should equal the duration 9707 * of the scrolling animation.</p> 9708 * 9709 * <p>The animation starts only if at least one of the scrollbars is 9710 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9711 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9712 * this method returns true, and false otherwise. If the animation is 9713 * started, this method calls {@link #invalidate()}; in that case the 9714 * caller should not call {@link #invalidate()}.</p> 9715 * 9716 * <p>This method should be invoked every time a subclass directly updates 9717 * the scroll parameters.</p> 9718 * 9719 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9720 * and {@link #scrollTo(int, int)}.</p> 9721 * 9722 * @return true if the animation is played, false otherwise 9723 * 9724 * @see #awakenScrollBars(int) 9725 * @see #scrollBy(int, int) 9726 * @see #scrollTo(int, int) 9727 * @see #isHorizontalScrollBarEnabled() 9728 * @see #isVerticalScrollBarEnabled() 9729 * @see #setHorizontalScrollBarEnabled(boolean) 9730 * @see #setVerticalScrollBarEnabled(boolean) 9731 */ 9732 protected boolean awakenScrollBars() { 9733 return mScrollCache != null && 9734 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9735 } 9736 9737 /** 9738 * Trigger the scrollbars to draw. 9739 * This method differs from awakenScrollBars() only in its default duration. 9740 * initialAwakenScrollBars() will show the scroll bars for longer than 9741 * usual to give the user more of a chance to notice them. 9742 * 9743 * @return true if the animation is played, false otherwise. 9744 */ 9745 private boolean initialAwakenScrollBars() { 9746 return mScrollCache != null && 9747 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9748 } 9749 9750 /** 9751 * <p> 9752 * Trigger the scrollbars to draw. When invoked this method starts an 9753 * animation to fade the scrollbars out after a fixed delay. If a subclass 9754 * provides animated scrolling, the start delay should equal the duration of 9755 * the scrolling animation. 9756 * </p> 9757 * 9758 * <p> 9759 * The animation starts only if at least one of the scrollbars is enabled, 9760 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9761 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9762 * this method returns true, and false otherwise. If the animation is 9763 * started, this method calls {@link #invalidate()}; in that case the caller 9764 * should not call {@link #invalidate()}. 9765 * </p> 9766 * 9767 * <p> 9768 * This method should be invoked everytime a subclass directly updates the 9769 * scroll parameters. 9770 * </p> 9771 * 9772 * @param startDelay the delay, in milliseconds, after which the animation 9773 * should start; when the delay is 0, the animation starts 9774 * immediately 9775 * @return true if the animation is played, false otherwise 9776 * 9777 * @see #scrollBy(int, int) 9778 * @see #scrollTo(int, int) 9779 * @see #isHorizontalScrollBarEnabled() 9780 * @see #isVerticalScrollBarEnabled() 9781 * @see #setHorizontalScrollBarEnabled(boolean) 9782 * @see #setVerticalScrollBarEnabled(boolean) 9783 */ 9784 protected boolean awakenScrollBars(int startDelay) { 9785 return awakenScrollBars(startDelay, true); 9786 } 9787 9788 /** 9789 * <p> 9790 * Trigger the scrollbars to draw. When invoked this method starts an 9791 * animation to fade the scrollbars out after a fixed delay. If a subclass 9792 * provides animated scrolling, the start delay should equal the duration of 9793 * the scrolling animation. 9794 * </p> 9795 * 9796 * <p> 9797 * The animation starts only if at least one of the scrollbars is enabled, 9798 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9799 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9800 * this method returns true, and false otherwise. If the animation is 9801 * started, this method calls {@link #invalidate()} if the invalidate parameter 9802 * is set to true; in that case the caller 9803 * should not call {@link #invalidate()}. 9804 * </p> 9805 * 9806 * <p> 9807 * This method should be invoked everytime a subclass directly updates the 9808 * scroll parameters. 9809 * </p> 9810 * 9811 * @param startDelay the delay, in milliseconds, after which the animation 9812 * should start; when the delay is 0, the animation starts 9813 * immediately 9814 * 9815 * @param invalidate Wheter this method should call invalidate 9816 * 9817 * @return true if the animation is played, false otherwise 9818 * 9819 * @see #scrollBy(int, int) 9820 * @see #scrollTo(int, int) 9821 * @see #isHorizontalScrollBarEnabled() 9822 * @see #isVerticalScrollBarEnabled() 9823 * @see #setHorizontalScrollBarEnabled(boolean) 9824 * @see #setVerticalScrollBarEnabled(boolean) 9825 */ 9826 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9827 final ScrollabilityCache scrollCache = mScrollCache; 9828 9829 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9830 return false; 9831 } 9832 9833 if (scrollCache.scrollBar == null) { 9834 scrollCache.scrollBar = new ScrollBarDrawable(); 9835 } 9836 9837 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9838 9839 if (invalidate) { 9840 // Invalidate to show the scrollbars 9841 postInvalidateOnAnimation(); 9842 } 9843 9844 if (scrollCache.state == ScrollabilityCache.OFF) { 9845 // FIXME: this is copied from WindowManagerService. 9846 // We should get this value from the system when it 9847 // is possible to do so. 9848 final int KEY_REPEAT_FIRST_DELAY = 750; 9849 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9850 } 9851 9852 // Tell mScrollCache when we should start fading. This may 9853 // extend the fade start time if one was already scheduled 9854 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9855 scrollCache.fadeStartTime = fadeStartTime; 9856 scrollCache.state = ScrollabilityCache.ON; 9857 9858 // Schedule our fader to run, unscheduling any old ones first 9859 if (mAttachInfo != null) { 9860 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9861 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9862 } 9863 9864 return true; 9865 } 9866 9867 return false; 9868 } 9869 9870 /** 9871 * Do not invalidate views which are not visible and which are not running an animation. They 9872 * will not get drawn and they should not set dirty flags as if they will be drawn 9873 */ 9874 private boolean skipInvalidate() { 9875 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9876 (!(mParent instanceof ViewGroup) || 9877 !((ViewGroup) mParent).isViewTransitioning(this)); 9878 } 9879 /** 9880 * Mark the area defined by dirty as needing to be drawn. If the view is 9881 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9882 * in the future. This must be called from a UI thread. To call from a non-UI 9883 * thread, call {@link #postInvalidate()}. 9884 * 9885 * WARNING: This method is destructive to dirty. 9886 * @param dirty the rectangle representing the bounds of the dirty region 9887 */ 9888 public void invalidate(Rect dirty) { 9889 if (ViewDebug.TRACE_HIERARCHY) { 9890 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9891 } 9892 9893 if (skipInvalidate()) { 9894 return; 9895 } 9896 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9897 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9898 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9899 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9900 mPrivateFlags |= INVALIDATED; 9901 mPrivateFlags |= DIRTY; 9902 final ViewParent p = mParent; 9903 final AttachInfo ai = mAttachInfo; 9904 //noinspection PointlessBooleanExpression,ConstantConditions 9905 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9906 if (p != null && ai != null && ai.mHardwareAccelerated) { 9907 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9908 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9909 p.invalidateChild(this, null); 9910 return; 9911 } 9912 } 9913 if (p != null && ai != null) { 9914 final int scrollX = mScrollX; 9915 final int scrollY = mScrollY; 9916 final Rect r = ai.mTmpInvalRect; 9917 r.set(dirty.left - scrollX, dirty.top - scrollY, 9918 dirty.right - scrollX, dirty.bottom - scrollY); 9919 mParent.invalidateChild(this, r); 9920 } 9921 } 9922 } 9923 9924 /** 9925 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9926 * The coordinates of the dirty rect are relative to the view. 9927 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9928 * will be called at some point in the future. This must be called from 9929 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9930 * @param l the left position of the dirty region 9931 * @param t the top position of the dirty region 9932 * @param r the right position of the dirty region 9933 * @param b the bottom position of the dirty region 9934 */ 9935 public void invalidate(int l, int t, int r, int b) { 9936 if (ViewDebug.TRACE_HIERARCHY) { 9937 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9938 } 9939 9940 if (skipInvalidate()) { 9941 return; 9942 } 9943 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9944 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9945 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9946 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9947 mPrivateFlags |= INVALIDATED; 9948 mPrivateFlags |= DIRTY; 9949 final ViewParent p = mParent; 9950 final AttachInfo ai = mAttachInfo; 9951 //noinspection PointlessBooleanExpression,ConstantConditions 9952 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9953 if (p != null && ai != null && ai.mHardwareAccelerated) { 9954 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9955 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9956 p.invalidateChild(this, null); 9957 return; 9958 } 9959 } 9960 if (p != null && ai != null && l < r && t < b) { 9961 final int scrollX = mScrollX; 9962 final int scrollY = mScrollY; 9963 final Rect tmpr = ai.mTmpInvalRect; 9964 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9965 p.invalidateChild(this, tmpr); 9966 } 9967 } 9968 } 9969 9970 /** 9971 * Invalidate the whole view. If the view is visible, 9972 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9973 * the future. This must be called from a UI thread. To call from a non-UI thread, 9974 * call {@link #postInvalidate()}. 9975 */ 9976 public void invalidate() { 9977 invalidate(true); 9978 } 9979 9980 /** 9981 * This is where the invalidate() work actually happens. A full invalidate() 9982 * causes the drawing cache to be invalidated, but this function can be called with 9983 * invalidateCache set to false to skip that invalidation step for cases that do not 9984 * need it (for example, a component that remains at the same dimensions with the same 9985 * content). 9986 * 9987 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9988 * well. This is usually true for a full invalidate, but may be set to false if the 9989 * View's contents or dimensions have not changed. 9990 */ 9991 void invalidate(boolean invalidateCache) { 9992 if (ViewDebug.TRACE_HIERARCHY) { 9993 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9994 } 9995 9996 if (skipInvalidate()) { 9997 return; 9998 } 9999 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 10000 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 10001 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 10002 mLastIsOpaque = isOpaque(); 10003 mPrivateFlags &= ~DRAWN; 10004 mPrivateFlags |= DIRTY; 10005 if (invalidateCache) { 10006 mPrivateFlags |= INVALIDATED; 10007 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10008 } 10009 final AttachInfo ai = mAttachInfo; 10010 final ViewParent p = mParent; 10011 //noinspection PointlessBooleanExpression,ConstantConditions 10012 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10013 if (p != null && ai != null && ai.mHardwareAccelerated) { 10014 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10015 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10016 p.invalidateChild(this, null); 10017 return; 10018 } 10019 } 10020 10021 if (p != null && ai != null) { 10022 final Rect r = ai.mTmpInvalRect; 10023 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10024 // Don't call invalidate -- we don't want to internally scroll 10025 // our own bounds 10026 p.invalidateChild(this, r); 10027 } 10028 } 10029 } 10030 10031 /** 10032 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10033 * set any flags or handle all of the cases handled by the default invalidation methods. 10034 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10035 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10036 * walk up the hierarchy, transforming the dirty rect as necessary. 10037 * 10038 * The method also handles normal invalidation logic if display list properties are not 10039 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10040 * backup approach, to handle these cases used in the various property-setting methods. 10041 * 10042 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10043 * are not being used in this view 10044 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10045 * list properties are not being used in this view 10046 */ 10047 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10048 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10049 if (invalidateParent) { 10050 invalidateParentCaches(); 10051 } 10052 if (forceRedraw) { 10053 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10054 } 10055 invalidate(false); 10056 } else { 10057 final AttachInfo ai = mAttachInfo; 10058 final ViewParent p = mParent; 10059 if (p != null && ai != null) { 10060 final Rect r = ai.mTmpInvalRect; 10061 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10062 if (mParent instanceof ViewGroup) { 10063 ((ViewGroup) mParent).invalidateChildFast(this, r); 10064 } else { 10065 mParent.invalidateChild(this, r); 10066 } 10067 } 10068 } 10069 } 10070 10071 /** 10072 * Utility method to transform a given Rect by the current matrix of this view. 10073 */ 10074 void transformRect(final Rect rect) { 10075 if (!getMatrix().isIdentity()) { 10076 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10077 boundingRect.set(rect); 10078 getMatrix().mapRect(boundingRect); 10079 rect.set((int) (boundingRect.left - 0.5f), 10080 (int) (boundingRect.top - 0.5f), 10081 (int) (boundingRect.right + 0.5f), 10082 (int) (boundingRect.bottom + 0.5f)); 10083 } 10084 } 10085 10086 /** 10087 * Used to indicate that the parent of this view should clear its caches. This functionality 10088 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10089 * which is necessary when various parent-managed properties of the view change, such as 10090 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10091 * clears the parent caches and does not causes an invalidate event. 10092 * 10093 * @hide 10094 */ 10095 protected void invalidateParentCaches() { 10096 if (mParent instanceof View) { 10097 ((View) mParent).mPrivateFlags |= INVALIDATED; 10098 } 10099 } 10100 10101 /** 10102 * Used to indicate that the parent of this view should be invalidated. This functionality 10103 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10104 * which is necessary when various parent-managed properties of the view change, such as 10105 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10106 * an invalidation event to the parent. 10107 * 10108 * @hide 10109 */ 10110 protected void invalidateParentIfNeeded() { 10111 if (isHardwareAccelerated() && mParent instanceof View) { 10112 ((View) mParent).invalidate(true); 10113 } 10114 } 10115 10116 /** 10117 * Indicates whether this View is opaque. An opaque View guarantees that it will 10118 * draw all the pixels overlapping its bounds using a fully opaque color. 10119 * 10120 * Subclasses of View should override this method whenever possible to indicate 10121 * whether an instance is opaque. Opaque Views are treated in a special way by 10122 * the View hierarchy, possibly allowing it to perform optimizations during 10123 * invalidate/draw passes. 10124 * 10125 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10126 */ 10127 @ViewDebug.ExportedProperty(category = "drawing") 10128 public boolean isOpaque() { 10129 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10130 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10131 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10132 } 10133 10134 /** 10135 * @hide 10136 */ 10137 protected void computeOpaqueFlags() { 10138 // Opaque if: 10139 // - Has a background 10140 // - Background is opaque 10141 // - Doesn't have scrollbars or scrollbars are inside overlay 10142 10143 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10144 mPrivateFlags |= OPAQUE_BACKGROUND; 10145 } else { 10146 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10147 } 10148 10149 final int flags = mViewFlags; 10150 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10151 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10152 mPrivateFlags |= OPAQUE_SCROLLBARS; 10153 } else { 10154 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10155 } 10156 } 10157 10158 /** 10159 * @hide 10160 */ 10161 protected boolean hasOpaqueScrollbars() { 10162 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10163 } 10164 10165 /** 10166 * @return A handler associated with the thread running the View. This 10167 * handler can be used to pump events in the UI events queue. 10168 */ 10169 public Handler getHandler() { 10170 if (mAttachInfo != null) { 10171 return mAttachInfo.mHandler; 10172 } 10173 return null; 10174 } 10175 10176 /** 10177 * Gets the view root associated with the View. 10178 * @return The view root, or null if none. 10179 * @hide 10180 */ 10181 public ViewRootImpl getViewRootImpl() { 10182 if (mAttachInfo != null) { 10183 return mAttachInfo.mViewRootImpl; 10184 } 10185 return null; 10186 } 10187 10188 /** 10189 * <p>Causes the Runnable to be added to the message queue. 10190 * The runnable will be run on the user interface thread.</p> 10191 * 10192 * <p>This method can be invoked from outside of the UI thread 10193 * only when this View is attached to a window.</p> 10194 * 10195 * @param action The Runnable that will be executed. 10196 * 10197 * @return Returns true if the Runnable was successfully placed in to the 10198 * message queue. Returns false on failure, usually because the 10199 * looper processing the message queue is exiting. 10200 * 10201 * @see #postDelayed 10202 * @see #removeCallbacks 10203 */ 10204 public boolean post(Runnable action) { 10205 final AttachInfo attachInfo = mAttachInfo; 10206 if (attachInfo != null) { 10207 return attachInfo.mHandler.post(action); 10208 } 10209 // Assume that post will succeed later 10210 ViewRootImpl.getRunQueue().post(action); 10211 return true; 10212 } 10213 10214 /** 10215 * <p>Causes the Runnable to be added to the message queue, to be run 10216 * after the specified amount of time elapses. 10217 * The runnable will be run on the user interface thread.</p> 10218 * 10219 * <p>This method can be invoked from outside of the UI thread 10220 * only when this View is attached to a window.</p> 10221 * 10222 * @param action The Runnable that will be executed. 10223 * @param delayMillis The delay (in milliseconds) until the Runnable 10224 * will be executed. 10225 * 10226 * @return true if the Runnable was successfully placed in to the 10227 * message queue. Returns false on failure, usually because the 10228 * looper processing the message queue is exiting. Note that a 10229 * result of true does not mean the Runnable will be processed -- 10230 * if the looper is quit before the delivery time of the message 10231 * occurs then the message will be dropped. 10232 * 10233 * @see #post 10234 * @see #removeCallbacks 10235 */ 10236 public boolean postDelayed(Runnable action, long delayMillis) { 10237 final AttachInfo attachInfo = mAttachInfo; 10238 if (attachInfo != null) { 10239 return attachInfo.mHandler.postDelayed(action, delayMillis); 10240 } 10241 // Assume that post will succeed later 10242 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10243 return true; 10244 } 10245 10246 /** 10247 * <p>Causes the Runnable to execute on the next animation time step. 10248 * The runnable will be run on the user interface thread.</p> 10249 * 10250 * <p>This method can be invoked from outside of the UI thread 10251 * only when this View is attached to a window.</p> 10252 * 10253 * @param action The Runnable that will be executed. 10254 * 10255 * @see #postOnAnimationDelayed 10256 * @see #removeCallbacks 10257 */ 10258 public void postOnAnimation(Runnable action) { 10259 final AttachInfo attachInfo = mAttachInfo; 10260 if (attachInfo != null) { 10261 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10262 Choreographer.CALLBACK_ANIMATION, action, null); 10263 } else { 10264 // Assume that post will succeed later 10265 ViewRootImpl.getRunQueue().post(action); 10266 } 10267 } 10268 10269 /** 10270 * <p>Causes the Runnable to execute on the next animation time step, 10271 * after the specified amount of time elapses. 10272 * The runnable will be run on the user interface thread.</p> 10273 * 10274 * <p>This method can be invoked from outside of the UI thread 10275 * only when this View is attached to a window.</p> 10276 * 10277 * @param action The Runnable that will be executed. 10278 * @param delayMillis The delay (in milliseconds) until the Runnable 10279 * will be executed. 10280 * 10281 * @see #postOnAnimation 10282 * @see #removeCallbacks 10283 */ 10284 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10285 final AttachInfo attachInfo = mAttachInfo; 10286 if (attachInfo != null) { 10287 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10288 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10289 } else { 10290 // Assume that post will succeed later 10291 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10292 } 10293 } 10294 10295 /** 10296 * <p>Removes the specified Runnable from the message queue.</p> 10297 * 10298 * <p>This method can be invoked from outside of the UI thread 10299 * only when this View is attached to a window.</p> 10300 * 10301 * @param action The Runnable to remove from the message handling queue 10302 * 10303 * @return true if this view could ask the Handler to remove the Runnable, 10304 * false otherwise. When the returned value is true, the Runnable 10305 * may or may not have been actually removed from the message queue 10306 * (for instance, if the Runnable was not in the queue already.) 10307 * 10308 * @see #post 10309 * @see #postDelayed 10310 * @see #postOnAnimation 10311 * @see #postOnAnimationDelayed 10312 */ 10313 public boolean removeCallbacks(Runnable action) { 10314 if (action != null) { 10315 final AttachInfo attachInfo = mAttachInfo; 10316 if (attachInfo != null) { 10317 attachInfo.mHandler.removeCallbacks(action); 10318 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10319 Choreographer.CALLBACK_ANIMATION, action, null); 10320 } else { 10321 // Assume that post will succeed later 10322 ViewRootImpl.getRunQueue().removeCallbacks(action); 10323 } 10324 } 10325 return true; 10326 } 10327 10328 /** 10329 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10330 * Use this to invalidate the View from a non-UI thread.</p> 10331 * 10332 * <p>This method can be invoked from outside of the UI thread 10333 * only when this View is attached to a window.</p> 10334 * 10335 * @see #invalidate() 10336 * @see #postInvalidateDelayed(long) 10337 */ 10338 public void postInvalidate() { 10339 postInvalidateDelayed(0); 10340 } 10341 10342 /** 10343 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10344 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10345 * 10346 * <p>This method can be invoked from outside of the UI thread 10347 * only when this View is attached to a window.</p> 10348 * 10349 * @param left The left coordinate of the rectangle to invalidate. 10350 * @param top The top coordinate of the rectangle to invalidate. 10351 * @param right The right coordinate of the rectangle to invalidate. 10352 * @param bottom The bottom coordinate of the rectangle to invalidate. 10353 * 10354 * @see #invalidate(int, int, int, int) 10355 * @see #invalidate(Rect) 10356 * @see #postInvalidateDelayed(long, int, int, int, int) 10357 */ 10358 public void postInvalidate(int left, int top, int right, int bottom) { 10359 postInvalidateDelayed(0, left, top, right, bottom); 10360 } 10361 10362 /** 10363 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10364 * loop. Waits for the specified amount of time.</p> 10365 * 10366 * <p>This method can be invoked from outside of the UI thread 10367 * only when this View is attached to a window.</p> 10368 * 10369 * @param delayMilliseconds the duration in milliseconds to delay the 10370 * invalidation by 10371 * 10372 * @see #invalidate() 10373 * @see #postInvalidate() 10374 */ 10375 public void postInvalidateDelayed(long delayMilliseconds) { 10376 // We try only with the AttachInfo because there's no point in invalidating 10377 // if we are not attached to our window 10378 final AttachInfo attachInfo = mAttachInfo; 10379 if (attachInfo != null) { 10380 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10381 } 10382 } 10383 10384 /** 10385 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10386 * through the event loop. Waits for the specified amount of time.</p> 10387 * 10388 * <p>This method can be invoked from outside of the UI thread 10389 * only when this View is attached to a window.</p> 10390 * 10391 * @param delayMilliseconds the duration in milliseconds to delay the 10392 * invalidation by 10393 * @param left The left coordinate of the rectangle to invalidate. 10394 * @param top The top coordinate of the rectangle to invalidate. 10395 * @param right The right coordinate of the rectangle to invalidate. 10396 * @param bottom The bottom coordinate of the rectangle to invalidate. 10397 * 10398 * @see #invalidate(int, int, int, int) 10399 * @see #invalidate(Rect) 10400 * @see #postInvalidate(int, int, int, int) 10401 */ 10402 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10403 int right, int bottom) { 10404 10405 // We try only with the AttachInfo because there's no point in invalidating 10406 // if we are not attached to our window 10407 final AttachInfo attachInfo = mAttachInfo; 10408 if (attachInfo != null) { 10409 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10410 info.target = this; 10411 info.left = left; 10412 info.top = top; 10413 info.right = right; 10414 info.bottom = bottom; 10415 10416 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10417 } 10418 } 10419 10420 /** 10421 * <p>Cause an invalidate to happen on the next animation time step, typically the 10422 * next display frame.</p> 10423 * 10424 * <p>This method can be invoked from outside of the UI thread 10425 * only when this View is attached to a window.</p> 10426 * 10427 * @see #invalidate() 10428 */ 10429 public void postInvalidateOnAnimation() { 10430 // We try only with the AttachInfo because there's no point in invalidating 10431 // if we are not attached to our window 10432 final AttachInfo attachInfo = mAttachInfo; 10433 if (attachInfo != null) { 10434 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10435 } 10436 } 10437 10438 /** 10439 * <p>Cause an invalidate of the specified area to happen on the next animation 10440 * time step, typically the next display frame.</p> 10441 * 10442 * <p>This method can be invoked from outside of the UI thread 10443 * only when this View is attached to a window.</p> 10444 * 10445 * @param left The left coordinate of the rectangle to invalidate. 10446 * @param top The top coordinate of the rectangle to invalidate. 10447 * @param right The right coordinate of the rectangle to invalidate. 10448 * @param bottom The bottom coordinate of the rectangle to invalidate. 10449 * 10450 * @see #invalidate(int, int, int, int) 10451 * @see #invalidate(Rect) 10452 */ 10453 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10454 // We try only with the AttachInfo because there's no point in invalidating 10455 // if we are not attached to our window 10456 final AttachInfo attachInfo = mAttachInfo; 10457 if (attachInfo != null) { 10458 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10459 info.target = this; 10460 info.left = left; 10461 info.top = top; 10462 info.right = right; 10463 info.bottom = bottom; 10464 10465 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10466 } 10467 } 10468 10469 /** 10470 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10471 * This event is sent at most once every 10472 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10473 */ 10474 private void postSendViewScrolledAccessibilityEventCallback() { 10475 if (mSendViewScrolledAccessibilityEvent == null) { 10476 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10477 } 10478 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10479 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10480 postDelayed(mSendViewScrolledAccessibilityEvent, 10481 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10482 } 10483 } 10484 10485 /** 10486 * Called by a parent to request that a child update its values for mScrollX 10487 * and mScrollY if necessary. This will typically be done if the child is 10488 * animating a scroll using a {@link android.widget.Scroller Scroller} 10489 * object. 10490 */ 10491 public void computeScroll() { 10492 } 10493 10494 /** 10495 * <p>Indicate whether the horizontal edges are faded when the view is 10496 * scrolled horizontally.</p> 10497 * 10498 * @return true if the horizontal edges should are faded on scroll, false 10499 * otherwise 10500 * 10501 * @see #setHorizontalFadingEdgeEnabled(boolean) 10502 * 10503 * @attr ref android.R.styleable#View_requiresFadingEdge 10504 */ 10505 public boolean isHorizontalFadingEdgeEnabled() { 10506 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10507 } 10508 10509 /** 10510 * <p>Define whether the horizontal edges should be faded when this view 10511 * is scrolled horizontally.</p> 10512 * 10513 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10514 * be faded when the view is scrolled 10515 * horizontally 10516 * 10517 * @see #isHorizontalFadingEdgeEnabled() 10518 * 10519 * @attr ref android.R.styleable#View_requiresFadingEdge 10520 */ 10521 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10522 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10523 if (horizontalFadingEdgeEnabled) { 10524 initScrollCache(); 10525 } 10526 10527 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10528 } 10529 } 10530 10531 /** 10532 * <p>Indicate whether the vertical edges are faded when the view is 10533 * scrolled horizontally.</p> 10534 * 10535 * @return true if the vertical edges should are faded on scroll, false 10536 * otherwise 10537 * 10538 * @see #setVerticalFadingEdgeEnabled(boolean) 10539 * 10540 * @attr ref android.R.styleable#View_requiresFadingEdge 10541 */ 10542 public boolean isVerticalFadingEdgeEnabled() { 10543 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10544 } 10545 10546 /** 10547 * <p>Define whether the vertical edges should be faded when this view 10548 * is scrolled vertically.</p> 10549 * 10550 * @param verticalFadingEdgeEnabled true if the vertical edges should 10551 * be faded when the view is scrolled 10552 * vertically 10553 * 10554 * @see #isVerticalFadingEdgeEnabled() 10555 * 10556 * @attr ref android.R.styleable#View_requiresFadingEdge 10557 */ 10558 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10559 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10560 if (verticalFadingEdgeEnabled) { 10561 initScrollCache(); 10562 } 10563 10564 mViewFlags ^= FADING_EDGE_VERTICAL; 10565 } 10566 } 10567 10568 /** 10569 * Returns the strength, or intensity, of the top faded edge. The strength is 10570 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10571 * returns 0.0 or 1.0 but no value in between. 10572 * 10573 * Subclasses should override this method to provide a smoother fade transition 10574 * when scrolling occurs. 10575 * 10576 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10577 */ 10578 protected float getTopFadingEdgeStrength() { 10579 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10580 } 10581 10582 /** 10583 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10584 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10585 * returns 0.0 or 1.0 but no value in between. 10586 * 10587 * Subclasses should override this method to provide a smoother fade transition 10588 * when scrolling occurs. 10589 * 10590 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10591 */ 10592 protected float getBottomFadingEdgeStrength() { 10593 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10594 computeVerticalScrollRange() ? 1.0f : 0.0f; 10595 } 10596 10597 /** 10598 * Returns the strength, or intensity, of the left faded edge. The strength is 10599 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10600 * returns 0.0 or 1.0 but no value in between. 10601 * 10602 * Subclasses should override this method to provide a smoother fade transition 10603 * when scrolling occurs. 10604 * 10605 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10606 */ 10607 protected float getLeftFadingEdgeStrength() { 10608 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10609 } 10610 10611 /** 10612 * Returns the strength, or intensity, of the right faded edge. The strength is 10613 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10614 * returns 0.0 or 1.0 but no value in between. 10615 * 10616 * Subclasses should override this method to provide a smoother fade transition 10617 * when scrolling occurs. 10618 * 10619 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10620 */ 10621 protected float getRightFadingEdgeStrength() { 10622 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10623 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10624 } 10625 10626 /** 10627 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10628 * scrollbar is not drawn by default.</p> 10629 * 10630 * @return true if the horizontal scrollbar should be painted, false 10631 * otherwise 10632 * 10633 * @see #setHorizontalScrollBarEnabled(boolean) 10634 */ 10635 public boolean isHorizontalScrollBarEnabled() { 10636 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10637 } 10638 10639 /** 10640 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10641 * scrollbar is not drawn by default.</p> 10642 * 10643 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10644 * be painted 10645 * 10646 * @see #isHorizontalScrollBarEnabled() 10647 */ 10648 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10649 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10650 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10651 computeOpaqueFlags(); 10652 resolvePadding(); 10653 } 10654 } 10655 10656 /** 10657 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10658 * scrollbar is not drawn by default.</p> 10659 * 10660 * @return true if the vertical scrollbar should be painted, false 10661 * otherwise 10662 * 10663 * @see #setVerticalScrollBarEnabled(boolean) 10664 */ 10665 public boolean isVerticalScrollBarEnabled() { 10666 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10667 } 10668 10669 /** 10670 * <p>Define whether the vertical scrollbar should be drawn or not. The 10671 * scrollbar is not drawn by default.</p> 10672 * 10673 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10674 * be painted 10675 * 10676 * @see #isVerticalScrollBarEnabled() 10677 */ 10678 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10679 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10680 mViewFlags ^= SCROLLBARS_VERTICAL; 10681 computeOpaqueFlags(); 10682 resolvePadding(); 10683 } 10684 } 10685 10686 /** 10687 * @hide 10688 */ 10689 protected void recomputePadding() { 10690 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10691 } 10692 10693 /** 10694 * Define whether scrollbars will fade when the view is not scrolling. 10695 * 10696 * @param fadeScrollbars wheter to enable fading 10697 * 10698 * @attr ref android.R.styleable#View_fadeScrollbars 10699 */ 10700 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10701 initScrollCache(); 10702 final ScrollabilityCache scrollabilityCache = mScrollCache; 10703 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10704 if (fadeScrollbars) { 10705 scrollabilityCache.state = ScrollabilityCache.OFF; 10706 } else { 10707 scrollabilityCache.state = ScrollabilityCache.ON; 10708 } 10709 } 10710 10711 /** 10712 * 10713 * Returns true if scrollbars will fade when this view is not scrolling 10714 * 10715 * @return true if scrollbar fading is enabled 10716 * 10717 * @attr ref android.R.styleable#View_fadeScrollbars 10718 */ 10719 public boolean isScrollbarFadingEnabled() { 10720 return mScrollCache != null && mScrollCache.fadeScrollBars; 10721 } 10722 10723 /** 10724 * 10725 * Returns the delay before scrollbars fade. 10726 * 10727 * @return the delay before scrollbars fade 10728 * 10729 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10730 */ 10731 public int getScrollBarDefaultDelayBeforeFade() { 10732 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10733 mScrollCache.scrollBarDefaultDelayBeforeFade; 10734 } 10735 10736 /** 10737 * Define the delay before scrollbars fade. 10738 * 10739 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10740 * 10741 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10742 */ 10743 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10744 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10745 } 10746 10747 /** 10748 * 10749 * Returns the scrollbar fade duration. 10750 * 10751 * @return the scrollbar fade duration 10752 * 10753 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10754 */ 10755 public int getScrollBarFadeDuration() { 10756 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10757 mScrollCache.scrollBarFadeDuration; 10758 } 10759 10760 /** 10761 * Define the scrollbar fade duration. 10762 * 10763 * @param scrollBarFadeDuration - the scrollbar fade duration 10764 * 10765 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10766 */ 10767 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10768 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10769 } 10770 10771 /** 10772 * 10773 * Returns the scrollbar size. 10774 * 10775 * @return the scrollbar size 10776 * 10777 * @attr ref android.R.styleable#View_scrollbarSize 10778 */ 10779 public int getScrollBarSize() { 10780 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10781 mScrollCache.scrollBarSize; 10782 } 10783 10784 /** 10785 * Define the scrollbar size. 10786 * 10787 * @param scrollBarSize - the scrollbar size 10788 * 10789 * @attr ref android.R.styleable#View_scrollbarSize 10790 */ 10791 public void setScrollBarSize(int scrollBarSize) { 10792 getScrollCache().scrollBarSize = scrollBarSize; 10793 } 10794 10795 /** 10796 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10797 * inset. When inset, they add to the padding of the view. And the scrollbars 10798 * can be drawn inside the padding area or on the edge of the view. For example, 10799 * if a view has a background drawable and you want to draw the scrollbars 10800 * inside the padding specified by the drawable, you can use 10801 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10802 * appear at the edge of the view, ignoring the padding, then you can use 10803 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10804 * @param style the style of the scrollbars. Should be one of 10805 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10806 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10807 * @see #SCROLLBARS_INSIDE_OVERLAY 10808 * @see #SCROLLBARS_INSIDE_INSET 10809 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10810 * @see #SCROLLBARS_OUTSIDE_INSET 10811 * 10812 * @attr ref android.R.styleable#View_scrollbarStyle 10813 */ 10814 public void setScrollBarStyle(int style) { 10815 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10816 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10817 computeOpaqueFlags(); 10818 resolvePadding(); 10819 } 10820 } 10821 10822 /** 10823 * <p>Returns the current scrollbar style.</p> 10824 * @return the current scrollbar style 10825 * @see #SCROLLBARS_INSIDE_OVERLAY 10826 * @see #SCROLLBARS_INSIDE_INSET 10827 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10828 * @see #SCROLLBARS_OUTSIDE_INSET 10829 * 10830 * @attr ref android.R.styleable#View_scrollbarStyle 10831 */ 10832 @ViewDebug.ExportedProperty(mapping = { 10833 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10834 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10835 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10836 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10837 }) 10838 public int getScrollBarStyle() { 10839 return mViewFlags & SCROLLBARS_STYLE_MASK; 10840 } 10841 10842 /** 10843 * <p>Compute the horizontal range that the horizontal scrollbar 10844 * represents.</p> 10845 * 10846 * <p>The range is expressed in arbitrary units that must be the same as the 10847 * units used by {@link #computeHorizontalScrollExtent()} and 10848 * {@link #computeHorizontalScrollOffset()}.</p> 10849 * 10850 * <p>The default range is the drawing width of this view.</p> 10851 * 10852 * @return the total horizontal range represented by the horizontal 10853 * scrollbar 10854 * 10855 * @see #computeHorizontalScrollExtent() 10856 * @see #computeHorizontalScrollOffset() 10857 * @see android.widget.ScrollBarDrawable 10858 */ 10859 protected int computeHorizontalScrollRange() { 10860 return getWidth(); 10861 } 10862 10863 /** 10864 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10865 * within the horizontal range. This value is used to compute the position 10866 * of the thumb within the scrollbar's track.</p> 10867 * 10868 * <p>The range is expressed in arbitrary units that must be the same as the 10869 * units used by {@link #computeHorizontalScrollRange()} and 10870 * {@link #computeHorizontalScrollExtent()}.</p> 10871 * 10872 * <p>The default offset is the scroll offset of this view.</p> 10873 * 10874 * @return the horizontal offset of the scrollbar's thumb 10875 * 10876 * @see #computeHorizontalScrollRange() 10877 * @see #computeHorizontalScrollExtent() 10878 * @see android.widget.ScrollBarDrawable 10879 */ 10880 protected int computeHorizontalScrollOffset() { 10881 return mScrollX; 10882 } 10883 10884 /** 10885 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10886 * within the horizontal range. This value is used to compute the length 10887 * of the thumb within the scrollbar's track.</p> 10888 * 10889 * <p>The range is expressed in arbitrary units that must be the same as the 10890 * units used by {@link #computeHorizontalScrollRange()} and 10891 * {@link #computeHorizontalScrollOffset()}.</p> 10892 * 10893 * <p>The default extent is the drawing width of this view.</p> 10894 * 10895 * @return the horizontal extent of the scrollbar's thumb 10896 * 10897 * @see #computeHorizontalScrollRange() 10898 * @see #computeHorizontalScrollOffset() 10899 * @see android.widget.ScrollBarDrawable 10900 */ 10901 protected int computeHorizontalScrollExtent() { 10902 return getWidth(); 10903 } 10904 10905 /** 10906 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10907 * 10908 * <p>The range is expressed in arbitrary units that must be the same as the 10909 * units used by {@link #computeVerticalScrollExtent()} and 10910 * {@link #computeVerticalScrollOffset()}.</p> 10911 * 10912 * @return the total vertical range represented by the vertical scrollbar 10913 * 10914 * <p>The default range is the drawing height of this view.</p> 10915 * 10916 * @see #computeVerticalScrollExtent() 10917 * @see #computeVerticalScrollOffset() 10918 * @see android.widget.ScrollBarDrawable 10919 */ 10920 protected int computeVerticalScrollRange() { 10921 return getHeight(); 10922 } 10923 10924 /** 10925 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10926 * within the horizontal range. This value is used to compute the position 10927 * of the thumb within the scrollbar's track.</p> 10928 * 10929 * <p>The range is expressed in arbitrary units that must be the same as the 10930 * units used by {@link #computeVerticalScrollRange()} and 10931 * {@link #computeVerticalScrollExtent()}.</p> 10932 * 10933 * <p>The default offset is the scroll offset of this view.</p> 10934 * 10935 * @return the vertical offset of the scrollbar's thumb 10936 * 10937 * @see #computeVerticalScrollRange() 10938 * @see #computeVerticalScrollExtent() 10939 * @see android.widget.ScrollBarDrawable 10940 */ 10941 protected int computeVerticalScrollOffset() { 10942 return mScrollY; 10943 } 10944 10945 /** 10946 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10947 * within the vertical range. This value is used to compute the length 10948 * of the thumb within the scrollbar's track.</p> 10949 * 10950 * <p>The range is expressed in arbitrary units that must be the same as the 10951 * units used by {@link #computeVerticalScrollRange()} and 10952 * {@link #computeVerticalScrollOffset()}.</p> 10953 * 10954 * <p>The default extent is the drawing height of this view.</p> 10955 * 10956 * @return the vertical extent of the scrollbar's thumb 10957 * 10958 * @see #computeVerticalScrollRange() 10959 * @see #computeVerticalScrollOffset() 10960 * @see android.widget.ScrollBarDrawable 10961 */ 10962 protected int computeVerticalScrollExtent() { 10963 return getHeight(); 10964 } 10965 10966 /** 10967 * Check if this view can be scrolled horizontally in a certain direction. 10968 * 10969 * @param direction Negative to check scrolling left, positive to check scrolling right. 10970 * @return true if this view can be scrolled in the specified direction, false otherwise. 10971 */ 10972 public boolean canScrollHorizontally(int direction) { 10973 final int offset = computeHorizontalScrollOffset(); 10974 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 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 * Check if this view can be scrolled vertically in a certain direction. 10985 * 10986 * @param direction Negative to check scrolling up, positive to check scrolling down. 10987 * @return true if this view can be scrolled in the specified direction, false otherwise. 10988 */ 10989 public boolean canScrollVertically(int direction) { 10990 final int offset = computeVerticalScrollOffset(); 10991 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10992 if (range == 0) return false; 10993 if (direction < 0) { 10994 return offset > 0; 10995 } else { 10996 return offset < range - 1; 10997 } 10998 } 10999 11000 /** 11001 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11002 * scrollbars are painted only if they have been awakened first.</p> 11003 * 11004 * @param canvas the canvas on which to draw the scrollbars 11005 * 11006 * @see #awakenScrollBars(int) 11007 */ 11008 protected final void onDrawScrollBars(Canvas canvas) { 11009 // scrollbars are drawn only when the animation is running 11010 final ScrollabilityCache cache = mScrollCache; 11011 if (cache != null) { 11012 11013 int state = cache.state; 11014 11015 if (state == ScrollabilityCache.OFF) { 11016 return; 11017 } 11018 11019 boolean invalidate = false; 11020 11021 if (state == ScrollabilityCache.FADING) { 11022 // We're fading -- get our fade interpolation 11023 if (cache.interpolatorValues == null) { 11024 cache.interpolatorValues = new float[1]; 11025 } 11026 11027 float[] values = cache.interpolatorValues; 11028 11029 // Stops the animation if we're done 11030 if (cache.scrollBarInterpolator.timeToValues(values) == 11031 Interpolator.Result.FREEZE_END) { 11032 cache.state = ScrollabilityCache.OFF; 11033 } else { 11034 cache.scrollBar.setAlpha(Math.round(values[0])); 11035 } 11036 11037 // This will make the scroll bars inval themselves after 11038 // drawing. We only want this when we're fading so that 11039 // we prevent excessive redraws 11040 invalidate = true; 11041 } else { 11042 // We're just on -- but we may have been fading before so 11043 // reset alpha 11044 cache.scrollBar.setAlpha(255); 11045 } 11046 11047 11048 final int viewFlags = mViewFlags; 11049 11050 final boolean drawHorizontalScrollBar = 11051 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11052 final boolean drawVerticalScrollBar = 11053 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11054 && !isVerticalScrollBarHidden(); 11055 11056 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11057 final int width = mRight - mLeft; 11058 final int height = mBottom - mTop; 11059 11060 final ScrollBarDrawable scrollBar = cache.scrollBar; 11061 11062 final int scrollX = mScrollX; 11063 final int scrollY = mScrollY; 11064 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11065 11066 int left, top, right, bottom; 11067 11068 if (drawHorizontalScrollBar) { 11069 int size = scrollBar.getSize(false); 11070 if (size <= 0) { 11071 size = cache.scrollBarSize; 11072 } 11073 11074 scrollBar.setParameters(computeHorizontalScrollRange(), 11075 computeHorizontalScrollOffset(), 11076 computeHorizontalScrollExtent(), false); 11077 final int verticalScrollBarGap = drawVerticalScrollBar ? 11078 getVerticalScrollbarWidth() : 0; 11079 top = scrollY + height - size - (mUserPaddingBottom & inside); 11080 left = scrollX + (mPaddingLeft & inside); 11081 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11082 bottom = top + size; 11083 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11084 if (invalidate) { 11085 invalidate(left, top, right, bottom); 11086 } 11087 } 11088 11089 if (drawVerticalScrollBar) { 11090 int size = scrollBar.getSize(true); 11091 if (size <= 0) { 11092 size = cache.scrollBarSize; 11093 } 11094 11095 scrollBar.setParameters(computeVerticalScrollRange(), 11096 computeVerticalScrollOffset(), 11097 computeVerticalScrollExtent(), true); 11098 switch (mVerticalScrollbarPosition) { 11099 default: 11100 case SCROLLBAR_POSITION_DEFAULT: 11101 case SCROLLBAR_POSITION_RIGHT: 11102 left = scrollX + width - size - (mUserPaddingRight & inside); 11103 break; 11104 case SCROLLBAR_POSITION_LEFT: 11105 left = scrollX + (mUserPaddingLeft & inside); 11106 break; 11107 } 11108 top = scrollY + (mPaddingTop & inside); 11109 right = left + size; 11110 bottom = scrollY + height - (mUserPaddingBottom & inside); 11111 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11112 if (invalidate) { 11113 invalidate(left, top, right, bottom); 11114 } 11115 } 11116 } 11117 } 11118 } 11119 11120 /** 11121 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11122 * FastScroller is visible. 11123 * @return whether to temporarily hide the vertical scrollbar 11124 * @hide 11125 */ 11126 protected boolean isVerticalScrollBarHidden() { 11127 return false; 11128 } 11129 11130 /** 11131 * <p>Draw the horizontal scrollbar if 11132 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11133 * 11134 * @param canvas the canvas on which to draw the scrollbar 11135 * @param scrollBar the scrollbar's drawable 11136 * 11137 * @see #isHorizontalScrollBarEnabled() 11138 * @see #computeHorizontalScrollRange() 11139 * @see #computeHorizontalScrollExtent() 11140 * @see #computeHorizontalScrollOffset() 11141 * @see android.widget.ScrollBarDrawable 11142 * @hide 11143 */ 11144 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11145 int l, int t, int r, int b) { 11146 scrollBar.setBounds(l, t, r, b); 11147 scrollBar.draw(canvas); 11148 } 11149 11150 /** 11151 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11152 * returns true.</p> 11153 * 11154 * @param canvas the canvas on which to draw the scrollbar 11155 * @param scrollBar the scrollbar's drawable 11156 * 11157 * @see #isVerticalScrollBarEnabled() 11158 * @see #computeVerticalScrollRange() 11159 * @see #computeVerticalScrollExtent() 11160 * @see #computeVerticalScrollOffset() 11161 * @see android.widget.ScrollBarDrawable 11162 * @hide 11163 */ 11164 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11165 int l, int t, int r, int b) { 11166 scrollBar.setBounds(l, t, r, b); 11167 scrollBar.draw(canvas); 11168 } 11169 11170 /** 11171 * Implement this to do your drawing. 11172 * 11173 * @param canvas the canvas on which the background will be drawn 11174 */ 11175 protected void onDraw(Canvas canvas) { 11176 } 11177 11178 /* 11179 * Caller is responsible for calling requestLayout if necessary. 11180 * (This allows addViewInLayout to not request a new layout.) 11181 */ 11182 void assignParent(ViewParent parent) { 11183 if (mParent == null) { 11184 mParent = parent; 11185 } else if (parent == null) { 11186 mParent = null; 11187 } else { 11188 throw new RuntimeException("view " + this + " being added, but" 11189 + " it already has a parent"); 11190 } 11191 } 11192 11193 /** 11194 * This is called when the view is attached to a window. At this point it 11195 * has a Surface and will start drawing. Note that this function is 11196 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11197 * however it may be called any time before the first onDraw -- including 11198 * before or after {@link #onMeasure(int, int)}. 11199 * 11200 * @see #onDetachedFromWindow() 11201 */ 11202 protected void onAttachedToWindow() { 11203 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11204 mParent.requestTransparentRegion(this); 11205 } 11206 11207 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11208 initialAwakenScrollBars(); 11209 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11210 } 11211 11212 jumpDrawablesToCurrentState(); 11213 11214 // Order is important here: LayoutDirection MUST be resolved before Padding 11215 // and TextDirection 11216 resolveLayoutDirection(); 11217 resolvePadding(); 11218 resolveTextDirection(); 11219 resolveTextAlignment(); 11220 11221 clearAccessibilityFocus(); 11222 if (isFocused()) { 11223 InputMethodManager imm = InputMethodManager.peekInstance(); 11224 imm.focusIn(this); 11225 } 11226 11227 if (mAttachInfo != null && mDisplayList != null) { 11228 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11229 } 11230 } 11231 11232 /** 11233 * @see #onScreenStateChanged(int) 11234 */ 11235 void dispatchScreenStateChanged(int screenState) { 11236 onScreenStateChanged(screenState); 11237 } 11238 11239 /** 11240 * This method is called whenever the state of the screen this view is 11241 * attached to changes. A state change will usually occurs when the screen 11242 * turns on or off (whether it happens automatically or the user does it 11243 * manually.) 11244 * 11245 * @param screenState The new state of the screen. Can be either 11246 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11247 */ 11248 public void onScreenStateChanged(int screenState) { 11249 } 11250 11251 /** 11252 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11253 */ 11254 private boolean hasRtlSupport() { 11255 return mContext.getApplicationInfo().hasRtlSupport(); 11256 } 11257 11258 /** 11259 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11260 * that the parent directionality can and will be resolved before its children. 11261 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11262 * @hide 11263 */ 11264 public void resolveLayoutDirection() { 11265 // Clear any previous layout direction resolution 11266 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11267 11268 if (hasRtlSupport()) { 11269 // Set resolved depending on layout direction 11270 switch (getLayoutDirection()) { 11271 case LAYOUT_DIRECTION_INHERIT: 11272 // If this is root view, no need to look at parent's layout dir. 11273 if (canResolveLayoutDirection()) { 11274 ViewGroup viewGroup = ((ViewGroup) mParent); 11275 11276 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11277 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11278 } 11279 } else { 11280 // Nothing to do, LTR by default 11281 } 11282 break; 11283 case LAYOUT_DIRECTION_RTL: 11284 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11285 break; 11286 case LAYOUT_DIRECTION_LOCALE: 11287 if(isLayoutDirectionRtl(Locale.getDefault())) { 11288 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11289 } 11290 break; 11291 default: 11292 // Nothing to do, LTR by default 11293 } 11294 } 11295 11296 // Set to resolved 11297 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11298 onResolvedLayoutDirectionChanged(); 11299 // Resolve padding 11300 resolvePadding(); 11301 } 11302 11303 /** 11304 * Called when layout direction has been resolved. 11305 * 11306 * The default implementation does nothing. 11307 * @hide 11308 */ 11309 public void onResolvedLayoutDirectionChanged() { 11310 } 11311 11312 /** 11313 * Resolve padding depending on layout direction. 11314 * @hide 11315 */ 11316 public void resolvePadding() { 11317 // If the user specified the absolute padding (either with android:padding or 11318 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11319 // use the default padding or the padding from the background drawable 11320 // (stored at this point in mPadding*) 11321 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11322 switch (resolvedLayoutDirection) { 11323 case LAYOUT_DIRECTION_RTL: 11324 // Start user padding override Right user padding. Otherwise, if Right user 11325 // padding is not defined, use the default Right padding. If Right user padding 11326 // is defined, just use it. 11327 if (mUserPaddingStart >= 0) { 11328 mUserPaddingRight = mUserPaddingStart; 11329 } else if (mUserPaddingRight < 0) { 11330 mUserPaddingRight = mPaddingRight; 11331 } 11332 if (mUserPaddingEnd >= 0) { 11333 mUserPaddingLeft = mUserPaddingEnd; 11334 } else if (mUserPaddingLeft < 0) { 11335 mUserPaddingLeft = mPaddingLeft; 11336 } 11337 break; 11338 case LAYOUT_DIRECTION_LTR: 11339 default: 11340 // Start user padding override Left user padding. Otherwise, if Left user 11341 // padding is not defined, use the default left padding. If Left user padding 11342 // is defined, just use it. 11343 if (mUserPaddingStart >= 0) { 11344 mUserPaddingLeft = mUserPaddingStart; 11345 } else if (mUserPaddingLeft < 0) { 11346 mUserPaddingLeft = mPaddingLeft; 11347 } 11348 if (mUserPaddingEnd >= 0) { 11349 mUserPaddingRight = mUserPaddingEnd; 11350 } else if (mUserPaddingRight < 0) { 11351 mUserPaddingRight = mPaddingRight; 11352 } 11353 } 11354 11355 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11356 11357 if(isPaddingRelative()) { 11358 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11359 } else { 11360 recomputePadding(); 11361 } 11362 onPaddingChanged(resolvedLayoutDirection); 11363 } 11364 11365 /** 11366 * Resolve padding depending on the layout direction. Subclasses that care about 11367 * padding resolution should override this method. The default implementation does 11368 * nothing. 11369 * 11370 * @param layoutDirection the direction of the layout 11371 * 11372 * @see {@link #LAYOUT_DIRECTION_LTR} 11373 * @see {@link #LAYOUT_DIRECTION_RTL} 11374 * @hide 11375 */ 11376 public void onPaddingChanged(int layoutDirection) { 11377 } 11378 11379 /** 11380 * Check if layout direction resolution can be done. 11381 * 11382 * @return true if layout direction resolution can be done otherwise return false. 11383 * @hide 11384 */ 11385 public boolean canResolveLayoutDirection() { 11386 switch (getLayoutDirection()) { 11387 case LAYOUT_DIRECTION_INHERIT: 11388 return (mParent != null) && (mParent instanceof ViewGroup); 11389 default: 11390 return true; 11391 } 11392 } 11393 11394 /** 11395 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11396 * when reset is done. 11397 * @hide 11398 */ 11399 public void resetResolvedLayoutDirection() { 11400 // Reset the current resolved bits 11401 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11402 onResolvedLayoutDirectionReset(); 11403 // Reset also the text direction 11404 resetResolvedTextDirection(); 11405 } 11406 11407 /** 11408 * Called during reset of resolved layout direction. 11409 * 11410 * Subclasses need to override this method to clear cached information that depends on the 11411 * resolved layout direction, or to inform child views that inherit their layout direction. 11412 * 11413 * The default implementation does nothing. 11414 * @hide 11415 */ 11416 public void onResolvedLayoutDirectionReset() { 11417 } 11418 11419 /** 11420 * Check if a Locale uses an RTL script. 11421 * 11422 * @param locale Locale to check 11423 * @return true if the Locale uses an RTL script. 11424 * @hide 11425 */ 11426 protected static boolean isLayoutDirectionRtl(Locale locale) { 11427 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11428 } 11429 11430 /** 11431 * This is called when the view is detached from a window. At this point it 11432 * no longer has a surface for drawing. 11433 * 11434 * @see #onAttachedToWindow() 11435 */ 11436 protected void onDetachedFromWindow() { 11437 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11438 11439 removeUnsetPressCallback(); 11440 removeLongPressCallback(); 11441 removePerformClickCallback(); 11442 removeSendViewScrolledAccessibilityEventCallback(); 11443 11444 destroyDrawingCache(); 11445 11446 destroyLayer(false); 11447 11448 if (mAttachInfo != null) { 11449 if (mDisplayList != null) { 11450 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11451 } 11452 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11453 } else { 11454 if (mDisplayList != null) { 11455 // Should never happen 11456 mDisplayList.invalidate(); 11457 } 11458 } 11459 11460 mCurrentAnimation = null; 11461 11462 resetResolvedLayoutDirection(); 11463 resetResolvedTextAlignment(); 11464 resetAccessibilityStateChanged(); 11465 } 11466 11467 /** 11468 * @return The number of times this view has been attached to a window 11469 */ 11470 protected int getWindowAttachCount() { 11471 return mWindowAttachCount; 11472 } 11473 11474 /** 11475 * Retrieve a unique token identifying the window this view is attached to. 11476 * @return Return the window's token for use in 11477 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11478 */ 11479 public IBinder getWindowToken() { 11480 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11481 } 11482 11483 /** 11484 * Retrieve a unique token identifying the top-level "real" window of 11485 * the window that this view is attached to. That is, this is like 11486 * {@link #getWindowToken}, except if the window this view in is a panel 11487 * window (attached to another containing window), then the token of 11488 * the containing window is returned instead. 11489 * 11490 * @return Returns the associated window token, either 11491 * {@link #getWindowToken()} or the containing window's token. 11492 */ 11493 public IBinder getApplicationWindowToken() { 11494 AttachInfo ai = mAttachInfo; 11495 if (ai != null) { 11496 IBinder appWindowToken = ai.mPanelParentWindowToken; 11497 if (appWindowToken == null) { 11498 appWindowToken = ai.mWindowToken; 11499 } 11500 return appWindowToken; 11501 } 11502 return null; 11503 } 11504 11505 /** 11506 * Retrieve private session object this view hierarchy is using to 11507 * communicate with the window manager. 11508 * @return the session object to communicate with the window manager 11509 */ 11510 /*package*/ IWindowSession getWindowSession() { 11511 return mAttachInfo != null ? mAttachInfo.mSession : null; 11512 } 11513 11514 /** 11515 * @param info the {@link android.view.View.AttachInfo} to associated with 11516 * this view 11517 */ 11518 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11519 //System.out.println("Attached! " + this); 11520 mAttachInfo = info; 11521 mWindowAttachCount++; 11522 // We will need to evaluate the drawable state at least once. 11523 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11524 if (mFloatingTreeObserver != null) { 11525 info.mTreeObserver.merge(mFloatingTreeObserver); 11526 mFloatingTreeObserver = null; 11527 } 11528 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11529 mAttachInfo.mScrollContainers.add(this); 11530 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11531 } 11532 performCollectViewAttributes(mAttachInfo, visibility); 11533 onAttachedToWindow(); 11534 11535 ListenerInfo li = mListenerInfo; 11536 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11537 li != null ? li.mOnAttachStateChangeListeners : null; 11538 if (listeners != null && listeners.size() > 0) { 11539 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11540 // perform the dispatching. The iterator is a safe guard against listeners that 11541 // could mutate the list by calling the various add/remove methods. This prevents 11542 // the array from being modified while we iterate it. 11543 for (OnAttachStateChangeListener listener : listeners) { 11544 listener.onViewAttachedToWindow(this); 11545 } 11546 } 11547 11548 int vis = info.mWindowVisibility; 11549 if (vis != GONE) { 11550 onWindowVisibilityChanged(vis); 11551 } 11552 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11553 // If nobody has evaluated the drawable state yet, then do it now. 11554 refreshDrawableState(); 11555 } 11556 } 11557 11558 void dispatchDetachedFromWindow() { 11559 AttachInfo info = mAttachInfo; 11560 if (info != null) { 11561 int vis = info.mWindowVisibility; 11562 if (vis != GONE) { 11563 onWindowVisibilityChanged(GONE); 11564 } 11565 } 11566 11567 onDetachedFromWindow(); 11568 11569 ListenerInfo li = mListenerInfo; 11570 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11571 li != null ? li.mOnAttachStateChangeListeners : null; 11572 if (listeners != null && listeners.size() > 0) { 11573 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11574 // perform the dispatching. The iterator is a safe guard against listeners that 11575 // could mutate the list by calling the various add/remove methods. This prevents 11576 // the array from being modified while we iterate it. 11577 for (OnAttachStateChangeListener listener : listeners) { 11578 listener.onViewDetachedFromWindow(this); 11579 } 11580 } 11581 11582 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11583 mAttachInfo.mScrollContainers.remove(this); 11584 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11585 } 11586 11587 mAttachInfo = null; 11588 } 11589 11590 /** 11591 * Store this view hierarchy's frozen state into the given container. 11592 * 11593 * @param container The SparseArray in which to save the view's state. 11594 * 11595 * @see #restoreHierarchyState(android.util.SparseArray) 11596 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11597 * @see #onSaveInstanceState() 11598 */ 11599 public void saveHierarchyState(SparseArray<Parcelable> container) { 11600 dispatchSaveInstanceState(container); 11601 } 11602 11603 /** 11604 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11605 * this view and its children. May be overridden to modify how freezing happens to a 11606 * view's children; for example, some views may want to not store state for their children. 11607 * 11608 * @param container The SparseArray in which to save the view's state. 11609 * 11610 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11611 * @see #saveHierarchyState(android.util.SparseArray) 11612 * @see #onSaveInstanceState() 11613 */ 11614 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11615 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11616 mPrivateFlags &= ~SAVE_STATE_CALLED; 11617 Parcelable state = onSaveInstanceState(); 11618 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11619 throw new IllegalStateException( 11620 "Derived class did not call super.onSaveInstanceState()"); 11621 } 11622 if (state != null) { 11623 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11624 // + ": " + state); 11625 container.put(mID, state); 11626 } 11627 } 11628 } 11629 11630 /** 11631 * Hook allowing a view to generate a representation of its internal state 11632 * that can later be used to create a new instance with that same state. 11633 * This state should only contain information that is not persistent or can 11634 * not be reconstructed later. For example, you will never store your 11635 * current position on screen because that will be computed again when a 11636 * new instance of the view is placed in its view hierarchy. 11637 * <p> 11638 * Some examples of things you may store here: the current cursor position 11639 * in a text view (but usually not the text itself since that is stored in a 11640 * content provider or other persistent storage), the currently selected 11641 * item in a list view. 11642 * 11643 * @return Returns a Parcelable object containing the view's current dynamic 11644 * state, or null if there is nothing interesting to save. The 11645 * default implementation returns null. 11646 * @see #onRestoreInstanceState(android.os.Parcelable) 11647 * @see #saveHierarchyState(android.util.SparseArray) 11648 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11649 * @see #setSaveEnabled(boolean) 11650 */ 11651 protected Parcelable onSaveInstanceState() { 11652 mPrivateFlags |= SAVE_STATE_CALLED; 11653 return BaseSavedState.EMPTY_STATE; 11654 } 11655 11656 /** 11657 * Restore this view hierarchy's frozen state from the given container. 11658 * 11659 * @param container The SparseArray which holds previously frozen states. 11660 * 11661 * @see #saveHierarchyState(android.util.SparseArray) 11662 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11663 * @see #onRestoreInstanceState(android.os.Parcelable) 11664 */ 11665 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11666 dispatchRestoreInstanceState(container); 11667 } 11668 11669 /** 11670 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11671 * state for this view and its children. May be overridden to modify how restoring 11672 * happens to a view's children; for example, some views may want to not store state 11673 * for their children. 11674 * 11675 * @param container The SparseArray which holds previously saved state. 11676 * 11677 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11678 * @see #restoreHierarchyState(android.util.SparseArray) 11679 * @see #onRestoreInstanceState(android.os.Parcelable) 11680 */ 11681 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11682 if (mID != NO_ID) { 11683 Parcelable state = container.get(mID); 11684 if (state != null) { 11685 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11686 // + ": " + state); 11687 mPrivateFlags &= ~SAVE_STATE_CALLED; 11688 onRestoreInstanceState(state); 11689 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11690 throw new IllegalStateException( 11691 "Derived class did not call super.onRestoreInstanceState()"); 11692 } 11693 } 11694 } 11695 } 11696 11697 /** 11698 * Hook allowing a view to re-apply a representation of its internal state that had previously 11699 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11700 * null state. 11701 * 11702 * @param state The frozen state that had previously been returned by 11703 * {@link #onSaveInstanceState}. 11704 * 11705 * @see #onSaveInstanceState() 11706 * @see #restoreHierarchyState(android.util.SparseArray) 11707 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11708 */ 11709 protected void onRestoreInstanceState(Parcelable state) { 11710 mPrivateFlags |= SAVE_STATE_CALLED; 11711 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11712 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11713 + "received " + state.getClass().toString() + " instead. This usually happens " 11714 + "when two views of different type have the same id in the same hierarchy. " 11715 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11716 + "other views do not use the same id."); 11717 } 11718 } 11719 11720 /** 11721 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11722 * 11723 * @return the drawing start time in milliseconds 11724 */ 11725 public long getDrawingTime() { 11726 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11727 } 11728 11729 /** 11730 * <p>Enables or disables the duplication of the parent's state into this view. When 11731 * duplication is enabled, this view gets its drawable state from its parent rather 11732 * than from its own internal properties.</p> 11733 * 11734 * <p>Note: in the current implementation, setting this property to true after the 11735 * view was added to a ViewGroup might have no effect at all. This property should 11736 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11737 * 11738 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11739 * property is enabled, an exception will be thrown.</p> 11740 * 11741 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11742 * parent, these states should not be affected by this method.</p> 11743 * 11744 * @param enabled True to enable duplication of the parent's drawable state, false 11745 * to disable it. 11746 * 11747 * @see #getDrawableState() 11748 * @see #isDuplicateParentStateEnabled() 11749 */ 11750 public void setDuplicateParentStateEnabled(boolean enabled) { 11751 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11752 } 11753 11754 /** 11755 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11756 * 11757 * @return True if this view's drawable state is duplicated from the parent, 11758 * false otherwise 11759 * 11760 * @see #getDrawableState() 11761 * @see #setDuplicateParentStateEnabled(boolean) 11762 */ 11763 public boolean isDuplicateParentStateEnabled() { 11764 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11765 } 11766 11767 /** 11768 * <p>Specifies the type of layer backing this view. The layer can be 11769 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11770 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11771 * 11772 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11773 * instance that controls how the layer is composed on screen. The following 11774 * properties of the paint are taken into account when composing the layer:</p> 11775 * <ul> 11776 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11777 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11778 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11779 * </ul> 11780 * 11781 * <p>If this view has an alpha value set to < 1.0 by calling 11782 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11783 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11784 * equivalent to setting a hardware layer on this view and providing a paint with 11785 * the desired alpha value.<p> 11786 * 11787 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11788 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11789 * for more information on when and how to use layers.</p> 11790 * 11791 * @param layerType The ype of layer to use with this view, must be one of 11792 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11793 * {@link #LAYER_TYPE_HARDWARE} 11794 * @param paint The paint used to compose the layer. This argument is optional 11795 * and can be null. It is ignored when the layer type is 11796 * {@link #LAYER_TYPE_NONE} 11797 * 11798 * @see #getLayerType() 11799 * @see #LAYER_TYPE_NONE 11800 * @see #LAYER_TYPE_SOFTWARE 11801 * @see #LAYER_TYPE_HARDWARE 11802 * @see #setAlpha(float) 11803 * 11804 * @attr ref android.R.styleable#View_layerType 11805 */ 11806 public void setLayerType(int layerType, Paint paint) { 11807 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11808 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11809 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11810 } 11811 11812 if (layerType == mLayerType) { 11813 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11814 mLayerPaint = paint == null ? new Paint() : paint; 11815 invalidateParentCaches(); 11816 invalidate(true); 11817 } 11818 return; 11819 } 11820 11821 // Destroy any previous software drawing cache if needed 11822 switch (mLayerType) { 11823 case LAYER_TYPE_HARDWARE: 11824 destroyLayer(false); 11825 // fall through - non-accelerated views may use software layer mechanism instead 11826 case LAYER_TYPE_SOFTWARE: 11827 destroyDrawingCache(); 11828 break; 11829 default: 11830 break; 11831 } 11832 11833 mLayerType = layerType; 11834 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11835 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11836 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11837 11838 invalidateParentCaches(); 11839 invalidate(true); 11840 } 11841 11842 /** 11843 * Indicates whether this view has a static layer. A view with layer type 11844 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11845 * dynamic. 11846 */ 11847 boolean hasStaticLayer() { 11848 return true; 11849 } 11850 11851 /** 11852 * Indicates what type of layer is currently associated with this view. By default 11853 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11854 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11855 * for more information on the different types of layers. 11856 * 11857 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11858 * {@link #LAYER_TYPE_HARDWARE} 11859 * 11860 * @see #setLayerType(int, android.graphics.Paint) 11861 * @see #buildLayer() 11862 * @see #LAYER_TYPE_NONE 11863 * @see #LAYER_TYPE_SOFTWARE 11864 * @see #LAYER_TYPE_HARDWARE 11865 */ 11866 public int getLayerType() { 11867 return mLayerType; 11868 } 11869 11870 /** 11871 * Forces this view's layer to be created and this view to be rendered 11872 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11873 * invoking this method will have no effect. 11874 * 11875 * This method can for instance be used to render a view into its layer before 11876 * starting an animation. If this view is complex, rendering into the layer 11877 * before starting the animation will avoid skipping frames. 11878 * 11879 * @throws IllegalStateException If this view is not attached to a window 11880 * 11881 * @see #setLayerType(int, android.graphics.Paint) 11882 */ 11883 public void buildLayer() { 11884 if (mLayerType == LAYER_TYPE_NONE) return; 11885 11886 if (mAttachInfo == null) { 11887 throw new IllegalStateException("This view must be attached to a window first"); 11888 } 11889 11890 switch (mLayerType) { 11891 case LAYER_TYPE_HARDWARE: 11892 if (mAttachInfo.mHardwareRenderer != null && 11893 mAttachInfo.mHardwareRenderer.isEnabled() && 11894 mAttachInfo.mHardwareRenderer.validate()) { 11895 getHardwareLayer(); 11896 } 11897 break; 11898 case LAYER_TYPE_SOFTWARE: 11899 buildDrawingCache(true); 11900 break; 11901 } 11902 } 11903 11904 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11905 void flushLayer() { 11906 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11907 mHardwareLayer.flush(); 11908 } 11909 } 11910 11911 /** 11912 * <p>Returns a hardware layer that can be used to draw this view again 11913 * without executing its draw method.</p> 11914 * 11915 * @return A HardwareLayer ready to render, or null if an error occurred. 11916 */ 11917 HardwareLayer getHardwareLayer() { 11918 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11919 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11920 return null; 11921 } 11922 11923 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11924 11925 final int width = mRight - mLeft; 11926 final int height = mBottom - mTop; 11927 11928 if (width == 0 || height == 0) { 11929 return null; 11930 } 11931 11932 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11933 if (mHardwareLayer == null) { 11934 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11935 width, height, isOpaque()); 11936 mLocalDirtyRect.set(0, 0, width, height); 11937 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11938 mHardwareLayer.resize(width, height); 11939 mLocalDirtyRect.set(0, 0, width, height); 11940 } 11941 11942 // The layer is not valid if the underlying GPU resources cannot be allocated 11943 if (!mHardwareLayer.isValid()) { 11944 return null; 11945 } 11946 11947 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11948 mLocalDirtyRect.setEmpty(); 11949 } 11950 11951 return mHardwareLayer; 11952 } 11953 11954 /** 11955 * Destroys this View's hardware layer if possible. 11956 * 11957 * @return True if the layer was destroyed, false otherwise. 11958 * 11959 * @see #setLayerType(int, android.graphics.Paint) 11960 * @see #LAYER_TYPE_HARDWARE 11961 */ 11962 boolean destroyLayer(boolean valid) { 11963 if (mHardwareLayer != null) { 11964 AttachInfo info = mAttachInfo; 11965 if (info != null && info.mHardwareRenderer != null && 11966 info.mHardwareRenderer.isEnabled() && 11967 (valid || info.mHardwareRenderer.validate())) { 11968 mHardwareLayer.destroy(); 11969 mHardwareLayer = null; 11970 11971 invalidate(true); 11972 invalidateParentCaches(); 11973 } 11974 return true; 11975 } 11976 return false; 11977 } 11978 11979 /** 11980 * Destroys all hardware rendering resources. This method is invoked 11981 * when the system needs to reclaim resources. Upon execution of this 11982 * method, you should free any OpenGL resources created by the view. 11983 * 11984 * Note: you <strong>must</strong> call 11985 * <code>super.destroyHardwareResources()</code> when overriding 11986 * this method. 11987 * 11988 * @hide 11989 */ 11990 protected void destroyHardwareResources() { 11991 destroyLayer(true); 11992 } 11993 11994 /** 11995 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11996 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11997 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11998 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11999 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12000 * null.</p> 12001 * 12002 * <p>Enabling the drawing cache is similar to 12003 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12004 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12005 * drawing cache has no effect on rendering because the system uses a different mechanism 12006 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12007 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12008 * for information on how to enable software and hardware layers.</p> 12009 * 12010 * <p>This API can be used to manually generate 12011 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12012 * {@link #getDrawingCache()}.</p> 12013 * 12014 * @param enabled true to enable the drawing cache, false otherwise 12015 * 12016 * @see #isDrawingCacheEnabled() 12017 * @see #getDrawingCache() 12018 * @see #buildDrawingCache() 12019 * @see #setLayerType(int, android.graphics.Paint) 12020 */ 12021 public void setDrawingCacheEnabled(boolean enabled) { 12022 mCachingFailed = false; 12023 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12024 } 12025 12026 /** 12027 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12028 * 12029 * @return true if the drawing cache is enabled 12030 * 12031 * @see #setDrawingCacheEnabled(boolean) 12032 * @see #getDrawingCache() 12033 */ 12034 @ViewDebug.ExportedProperty(category = "drawing") 12035 public boolean isDrawingCacheEnabled() { 12036 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12037 } 12038 12039 /** 12040 * Debugging utility which recursively outputs the dirty state of a view and its 12041 * descendants. 12042 * 12043 * @hide 12044 */ 12045 @SuppressWarnings({"UnusedDeclaration"}) 12046 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12047 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12048 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12049 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12050 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12051 if (clear) { 12052 mPrivateFlags &= clearMask; 12053 } 12054 if (this instanceof ViewGroup) { 12055 ViewGroup parent = (ViewGroup) this; 12056 final int count = parent.getChildCount(); 12057 for (int i = 0; i < count; i++) { 12058 final View child = parent.getChildAt(i); 12059 child.outputDirtyFlags(indent + " ", clear, clearMask); 12060 } 12061 } 12062 } 12063 12064 /** 12065 * This method is used by ViewGroup to cause its children to restore or recreate their 12066 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12067 * to recreate its own display list, which would happen if it went through the normal 12068 * draw/dispatchDraw mechanisms. 12069 * 12070 * @hide 12071 */ 12072 protected void dispatchGetDisplayList() {} 12073 12074 /** 12075 * A view that is not attached or hardware accelerated cannot create a display list. 12076 * This method checks these conditions and returns the appropriate result. 12077 * 12078 * @return true if view has the ability to create a display list, false otherwise. 12079 * 12080 * @hide 12081 */ 12082 public boolean canHaveDisplayList() { 12083 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12084 } 12085 12086 /** 12087 * @return The HardwareRenderer associated with that view or null if hardware rendering 12088 * is not supported or this this has not been attached to a window. 12089 * 12090 * @hide 12091 */ 12092 public HardwareRenderer getHardwareRenderer() { 12093 if (mAttachInfo != null) { 12094 return mAttachInfo.mHardwareRenderer; 12095 } 12096 return null; 12097 } 12098 12099 /** 12100 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12101 * Otherwise, the same display list will be returned (after having been rendered into 12102 * along the way, depending on the invalidation state of the view). 12103 * 12104 * @param displayList The previous version of this displayList, could be null. 12105 * @param isLayer Whether the requester of the display list is a layer. If so, 12106 * the view will avoid creating a layer inside the resulting display list. 12107 * @return A new or reused DisplayList object. 12108 */ 12109 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12110 if (!canHaveDisplayList()) { 12111 return null; 12112 } 12113 12114 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12115 displayList == null || !displayList.isValid() || 12116 (!isLayer && mRecreateDisplayList))) { 12117 // Don't need to recreate the display list, just need to tell our 12118 // children to restore/recreate theirs 12119 if (displayList != null && displayList.isValid() && 12120 !isLayer && !mRecreateDisplayList) { 12121 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12122 mPrivateFlags &= ~DIRTY_MASK; 12123 dispatchGetDisplayList(); 12124 12125 return displayList; 12126 } 12127 12128 if (!isLayer) { 12129 // If we got here, we're recreating it. Mark it as such to ensure that 12130 // we copy in child display lists into ours in drawChild() 12131 mRecreateDisplayList = true; 12132 } 12133 if (displayList == null) { 12134 final String name = getClass().getSimpleName(); 12135 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12136 // If we're creating a new display list, make sure our parent gets invalidated 12137 // since they will need to recreate their display list to account for this 12138 // new child display list. 12139 invalidateParentCaches(); 12140 } 12141 12142 boolean caching = false; 12143 final HardwareCanvas canvas = displayList.start(); 12144 int width = mRight - mLeft; 12145 int height = mBottom - mTop; 12146 12147 try { 12148 canvas.setViewport(width, height); 12149 // The dirty rect should always be null for a display list 12150 canvas.onPreDraw(null); 12151 int layerType = ( 12152 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12153 getLayerType() : LAYER_TYPE_NONE; 12154 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12155 if (layerType == LAYER_TYPE_HARDWARE) { 12156 final HardwareLayer layer = getHardwareLayer(); 12157 if (layer != null && layer.isValid()) { 12158 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12159 } else { 12160 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12161 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12162 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12163 } 12164 caching = true; 12165 } else { 12166 buildDrawingCache(true); 12167 Bitmap cache = getDrawingCache(true); 12168 if (cache != null) { 12169 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12170 caching = true; 12171 } 12172 } 12173 } else { 12174 12175 computeScroll(); 12176 12177 canvas.translate(-mScrollX, -mScrollY); 12178 if (!isLayer) { 12179 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12180 mPrivateFlags &= ~DIRTY_MASK; 12181 } 12182 12183 // Fast path for layouts with no backgrounds 12184 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12185 dispatchDraw(canvas); 12186 } else { 12187 draw(canvas); 12188 } 12189 } 12190 } finally { 12191 canvas.onPostDraw(); 12192 12193 displayList.end(); 12194 displayList.setCaching(caching); 12195 if (isLayer) { 12196 displayList.setLeftTopRightBottom(0, 0, width, height); 12197 } else { 12198 setDisplayListProperties(displayList); 12199 } 12200 } 12201 } else if (!isLayer) { 12202 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12203 mPrivateFlags &= ~DIRTY_MASK; 12204 } 12205 12206 return displayList; 12207 } 12208 12209 /** 12210 * Get the DisplayList for the HardwareLayer 12211 * 12212 * @param layer The HardwareLayer whose DisplayList we want 12213 * @return A DisplayList fopr the specified HardwareLayer 12214 */ 12215 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12216 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12217 layer.setDisplayList(displayList); 12218 return displayList; 12219 } 12220 12221 12222 /** 12223 * <p>Returns a display list that can be used to draw this view again 12224 * without executing its draw method.</p> 12225 * 12226 * @return A DisplayList ready to replay, or null if caching is not enabled. 12227 * 12228 * @hide 12229 */ 12230 public DisplayList getDisplayList() { 12231 mDisplayList = getDisplayList(mDisplayList, false); 12232 return mDisplayList; 12233 } 12234 12235 /** 12236 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12237 * 12238 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12239 * 12240 * @see #getDrawingCache(boolean) 12241 */ 12242 public Bitmap getDrawingCache() { 12243 return getDrawingCache(false); 12244 } 12245 12246 /** 12247 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12248 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12249 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12250 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12251 * request the drawing cache by calling this method and draw it on screen if the 12252 * returned bitmap is not null.</p> 12253 * 12254 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12255 * this method will create a bitmap of the same size as this view. Because this bitmap 12256 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12257 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12258 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12259 * size than the view. This implies that your application must be able to handle this 12260 * size.</p> 12261 * 12262 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12263 * the current density of the screen when the application is in compatibility 12264 * mode. 12265 * 12266 * @return A bitmap representing this view or null if cache is disabled. 12267 * 12268 * @see #setDrawingCacheEnabled(boolean) 12269 * @see #isDrawingCacheEnabled() 12270 * @see #buildDrawingCache(boolean) 12271 * @see #destroyDrawingCache() 12272 */ 12273 public Bitmap getDrawingCache(boolean autoScale) { 12274 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12275 return null; 12276 } 12277 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12278 buildDrawingCache(autoScale); 12279 } 12280 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12281 } 12282 12283 /** 12284 * <p>Frees the resources used by the drawing cache. If you call 12285 * {@link #buildDrawingCache()} manually without calling 12286 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12287 * should cleanup the cache with this method afterwards.</p> 12288 * 12289 * @see #setDrawingCacheEnabled(boolean) 12290 * @see #buildDrawingCache() 12291 * @see #getDrawingCache() 12292 */ 12293 public void destroyDrawingCache() { 12294 if (mDrawingCache != null) { 12295 mDrawingCache.recycle(); 12296 mDrawingCache = null; 12297 } 12298 if (mUnscaledDrawingCache != null) { 12299 mUnscaledDrawingCache.recycle(); 12300 mUnscaledDrawingCache = null; 12301 } 12302 } 12303 12304 /** 12305 * Setting a solid background color for the drawing cache's bitmaps will improve 12306 * performance and memory usage. Note, though that this should only be used if this 12307 * view will always be drawn on top of a solid color. 12308 * 12309 * @param color The background color to use for the drawing cache's bitmap 12310 * 12311 * @see #setDrawingCacheEnabled(boolean) 12312 * @see #buildDrawingCache() 12313 * @see #getDrawingCache() 12314 */ 12315 public void setDrawingCacheBackgroundColor(int color) { 12316 if (color != mDrawingCacheBackgroundColor) { 12317 mDrawingCacheBackgroundColor = color; 12318 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12319 } 12320 } 12321 12322 /** 12323 * @see #setDrawingCacheBackgroundColor(int) 12324 * 12325 * @return The background color to used for the drawing cache's bitmap 12326 */ 12327 public int getDrawingCacheBackgroundColor() { 12328 return mDrawingCacheBackgroundColor; 12329 } 12330 12331 /** 12332 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12333 * 12334 * @see #buildDrawingCache(boolean) 12335 */ 12336 public void buildDrawingCache() { 12337 buildDrawingCache(false); 12338 } 12339 12340 /** 12341 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12342 * 12343 * <p>If you call {@link #buildDrawingCache()} manually without calling 12344 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12345 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12346 * 12347 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12348 * this method will create a bitmap of the same size as this view. Because this bitmap 12349 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12350 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12351 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12352 * size than the view. This implies that your application must be able to handle this 12353 * size.</p> 12354 * 12355 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12356 * you do not need the drawing cache bitmap, calling this method will increase memory 12357 * usage and cause the view to be rendered in software once, thus negatively impacting 12358 * performance.</p> 12359 * 12360 * @see #getDrawingCache() 12361 * @see #destroyDrawingCache() 12362 */ 12363 public void buildDrawingCache(boolean autoScale) { 12364 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12365 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12366 mCachingFailed = false; 12367 12368 if (ViewDebug.TRACE_HIERARCHY) { 12369 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12370 } 12371 12372 int width = mRight - mLeft; 12373 int height = mBottom - mTop; 12374 12375 final AttachInfo attachInfo = mAttachInfo; 12376 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12377 12378 if (autoScale && scalingRequired) { 12379 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12380 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12381 } 12382 12383 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12384 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12385 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12386 12387 if (width <= 0 || height <= 0 || 12388 // Projected bitmap size in bytes 12389 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12390 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12391 destroyDrawingCache(); 12392 mCachingFailed = true; 12393 return; 12394 } 12395 12396 boolean clear = true; 12397 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12398 12399 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12400 Bitmap.Config quality; 12401 if (!opaque) { 12402 // Never pick ARGB_4444 because it looks awful 12403 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12404 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12405 case DRAWING_CACHE_QUALITY_AUTO: 12406 quality = Bitmap.Config.ARGB_8888; 12407 break; 12408 case DRAWING_CACHE_QUALITY_LOW: 12409 quality = Bitmap.Config.ARGB_8888; 12410 break; 12411 case DRAWING_CACHE_QUALITY_HIGH: 12412 quality = Bitmap.Config.ARGB_8888; 12413 break; 12414 default: 12415 quality = Bitmap.Config.ARGB_8888; 12416 break; 12417 } 12418 } else { 12419 // Optimization for translucent windows 12420 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12421 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12422 } 12423 12424 // Try to cleanup memory 12425 if (bitmap != null) bitmap.recycle(); 12426 12427 try { 12428 bitmap = Bitmap.createBitmap(width, height, quality); 12429 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12430 if (autoScale) { 12431 mDrawingCache = bitmap; 12432 } else { 12433 mUnscaledDrawingCache = bitmap; 12434 } 12435 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12436 } catch (OutOfMemoryError e) { 12437 // If there is not enough memory to create the bitmap cache, just 12438 // ignore the issue as bitmap caches are not required to draw the 12439 // view hierarchy 12440 if (autoScale) { 12441 mDrawingCache = null; 12442 } else { 12443 mUnscaledDrawingCache = null; 12444 } 12445 mCachingFailed = true; 12446 return; 12447 } 12448 12449 clear = drawingCacheBackgroundColor != 0; 12450 } 12451 12452 Canvas canvas; 12453 if (attachInfo != null) { 12454 canvas = attachInfo.mCanvas; 12455 if (canvas == null) { 12456 canvas = new Canvas(); 12457 } 12458 canvas.setBitmap(bitmap); 12459 // Temporarily clobber the cached Canvas in case one of our children 12460 // is also using a drawing cache. Without this, the children would 12461 // steal the canvas by attaching their own bitmap to it and bad, bad 12462 // thing would happen (invisible views, corrupted drawings, etc.) 12463 attachInfo.mCanvas = null; 12464 } else { 12465 // This case should hopefully never or seldom happen 12466 canvas = new Canvas(bitmap); 12467 } 12468 12469 if (clear) { 12470 bitmap.eraseColor(drawingCacheBackgroundColor); 12471 } 12472 12473 computeScroll(); 12474 final int restoreCount = canvas.save(); 12475 12476 if (autoScale && scalingRequired) { 12477 final float scale = attachInfo.mApplicationScale; 12478 canvas.scale(scale, scale); 12479 } 12480 12481 canvas.translate(-mScrollX, -mScrollY); 12482 12483 mPrivateFlags |= DRAWN; 12484 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12485 mLayerType != LAYER_TYPE_NONE) { 12486 mPrivateFlags |= DRAWING_CACHE_VALID; 12487 } 12488 12489 // Fast path for layouts with no backgrounds 12490 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12491 if (ViewDebug.TRACE_HIERARCHY) { 12492 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12493 } 12494 mPrivateFlags &= ~DIRTY_MASK; 12495 dispatchDraw(canvas); 12496 } else { 12497 draw(canvas); 12498 } 12499 12500 canvas.restoreToCount(restoreCount); 12501 canvas.setBitmap(null); 12502 12503 if (attachInfo != null) { 12504 // Restore the cached Canvas for our siblings 12505 attachInfo.mCanvas = canvas; 12506 } 12507 } 12508 } 12509 12510 /** 12511 * Create a snapshot of the view into a bitmap. We should probably make 12512 * some form of this public, but should think about the API. 12513 */ 12514 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12515 int width = mRight - mLeft; 12516 int height = mBottom - mTop; 12517 12518 final AttachInfo attachInfo = mAttachInfo; 12519 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12520 width = (int) ((width * scale) + 0.5f); 12521 height = (int) ((height * scale) + 0.5f); 12522 12523 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12524 if (bitmap == null) { 12525 throw new OutOfMemoryError(); 12526 } 12527 12528 Resources resources = getResources(); 12529 if (resources != null) { 12530 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12531 } 12532 12533 Canvas canvas; 12534 if (attachInfo != null) { 12535 canvas = attachInfo.mCanvas; 12536 if (canvas == null) { 12537 canvas = new Canvas(); 12538 } 12539 canvas.setBitmap(bitmap); 12540 // Temporarily clobber the cached Canvas in case one of our children 12541 // is also using a drawing cache. Without this, the children would 12542 // steal the canvas by attaching their own bitmap to it and bad, bad 12543 // things would happen (invisible views, corrupted drawings, etc.) 12544 attachInfo.mCanvas = null; 12545 } else { 12546 // This case should hopefully never or seldom happen 12547 canvas = new Canvas(bitmap); 12548 } 12549 12550 if ((backgroundColor & 0xff000000) != 0) { 12551 bitmap.eraseColor(backgroundColor); 12552 } 12553 12554 computeScroll(); 12555 final int restoreCount = canvas.save(); 12556 canvas.scale(scale, scale); 12557 canvas.translate(-mScrollX, -mScrollY); 12558 12559 // Temporarily remove the dirty mask 12560 int flags = mPrivateFlags; 12561 mPrivateFlags &= ~DIRTY_MASK; 12562 12563 // Fast path for layouts with no backgrounds 12564 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12565 dispatchDraw(canvas); 12566 } else { 12567 draw(canvas); 12568 } 12569 12570 mPrivateFlags = flags; 12571 12572 canvas.restoreToCount(restoreCount); 12573 canvas.setBitmap(null); 12574 12575 if (attachInfo != null) { 12576 // Restore the cached Canvas for our siblings 12577 attachInfo.mCanvas = canvas; 12578 } 12579 12580 return bitmap; 12581 } 12582 12583 /** 12584 * Indicates whether this View is currently in edit mode. A View is usually 12585 * in edit mode when displayed within a developer tool. For instance, if 12586 * this View is being drawn by a visual user interface builder, this method 12587 * should return true. 12588 * 12589 * Subclasses should check the return value of this method to provide 12590 * different behaviors if their normal behavior might interfere with the 12591 * host environment. For instance: the class spawns a thread in its 12592 * constructor, the drawing code relies on device-specific features, etc. 12593 * 12594 * This method is usually checked in the drawing code of custom widgets. 12595 * 12596 * @return True if this View is in edit mode, false otherwise. 12597 */ 12598 public boolean isInEditMode() { 12599 return false; 12600 } 12601 12602 /** 12603 * If the View draws content inside its padding and enables fading edges, 12604 * it needs to support padding offsets. Padding offsets are added to the 12605 * fading edges to extend the length of the fade so that it covers pixels 12606 * drawn inside the padding. 12607 * 12608 * Subclasses of this class should override this method if they need 12609 * to draw content inside the padding. 12610 * 12611 * @return True if padding offset must be applied, false otherwise. 12612 * 12613 * @see #getLeftPaddingOffset() 12614 * @see #getRightPaddingOffset() 12615 * @see #getTopPaddingOffset() 12616 * @see #getBottomPaddingOffset() 12617 * 12618 * @since CURRENT 12619 */ 12620 protected boolean isPaddingOffsetRequired() { 12621 return false; 12622 } 12623 12624 /** 12625 * Amount by which to extend the left fading region. Called only when 12626 * {@link #isPaddingOffsetRequired()} returns true. 12627 * 12628 * @return The left padding offset in pixels. 12629 * 12630 * @see #isPaddingOffsetRequired() 12631 * 12632 * @since CURRENT 12633 */ 12634 protected int getLeftPaddingOffset() { 12635 return 0; 12636 } 12637 12638 /** 12639 * Amount by which to extend the right fading region. Called only when 12640 * {@link #isPaddingOffsetRequired()} returns true. 12641 * 12642 * @return The right padding offset in pixels. 12643 * 12644 * @see #isPaddingOffsetRequired() 12645 * 12646 * @since CURRENT 12647 */ 12648 protected int getRightPaddingOffset() { 12649 return 0; 12650 } 12651 12652 /** 12653 * Amount by which to extend the top fading region. Called only when 12654 * {@link #isPaddingOffsetRequired()} returns true. 12655 * 12656 * @return The top padding offset in pixels. 12657 * 12658 * @see #isPaddingOffsetRequired() 12659 * 12660 * @since CURRENT 12661 */ 12662 protected int getTopPaddingOffset() { 12663 return 0; 12664 } 12665 12666 /** 12667 * Amount by which to extend the bottom fading region. Called only when 12668 * {@link #isPaddingOffsetRequired()} returns true. 12669 * 12670 * @return The bottom padding offset in pixels. 12671 * 12672 * @see #isPaddingOffsetRequired() 12673 * 12674 * @since CURRENT 12675 */ 12676 protected int getBottomPaddingOffset() { 12677 return 0; 12678 } 12679 12680 /** 12681 * @hide 12682 * @param offsetRequired 12683 */ 12684 protected int getFadeTop(boolean offsetRequired) { 12685 int top = mPaddingTop; 12686 if (offsetRequired) top += getTopPaddingOffset(); 12687 return top; 12688 } 12689 12690 /** 12691 * @hide 12692 * @param offsetRequired 12693 */ 12694 protected int getFadeHeight(boolean offsetRequired) { 12695 int padding = mPaddingTop; 12696 if (offsetRequired) padding += getTopPaddingOffset(); 12697 return mBottom - mTop - mPaddingBottom - padding; 12698 } 12699 12700 /** 12701 * <p>Indicates whether this view is attached to a hardware accelerated 12702 * window or not.</p> 12703 * 12704 * <p>Even if this method returns true, it does not mean that every call 12705 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12706 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12707 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12708 * window is hardware accelerated, 12709 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12710 * return false, and this method will return true.</p> 12711 * 12712 * @return True if the view is attached to a window and the window is 12713 * hardware accelerated; false in any other case. 12714 */ 12715 public boolean isHardwareAccelerated() { 12716 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12717 } 12718 12719 /** 12720 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12721 * case of an active Animation being run on the view. 12722 */ 12723 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12724 Animation a, boolean scalingRequired) { 12725 Transformation invalidationTransform; 12726 final int flags = parent.mGroupFlags; 12727 final boolean initialized = a.isInitialized(); 12728 if (!initialized) { 12729 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12730 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12731 onAnimationStart(); 12732 } 12733 12734 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12735 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12736 if (parent.mInvalidationTransformation == null) { 12737 parent.mInvalidationTransformation = new Transformation(); 12738 } 12739 invalidationTransform = parent.mInvalidationTransformation; 12740 a.getTransformation(drawingTime, invalidationTransform, 1f); 12741 } else { 12742 invalidationTransform = parent.mChildTransformation; 12743 } 12744 if (more) { 12745 if (!a.willChangeBounds()) { 12746 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12747 parent.FLAG_OPTIMIZE_INVALIDATE) { 12748 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12749 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12750 // The child need to draw an animation, potentially offscreen, so 12751 // make sure we do not cancel invalidate requests 12752 parent.mPrivateFlags |= DRAW_ANIMATION; 12753 parent.invalidate(mLeft, mTop, mRight, mBottom); 12754 } 12755 } else { 12756 if (parent.mInvalidateRegion == null) { 12757 parent.mInvalidateRegion = new RectF(); 12758 } 12759 final RectF region = parent.mInvalidateRegion; 12760 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12761 invalidationTransform); 12762 12763 // The child need to draw an animation, potentially offscreen, so 12764 // make sure we do not cancel invalidate requests 12765 parent.mPrivateFlags |= DRAW_ANIMATION; 12766 12767 final int left = mLeft + (int) region.left; 12768 final int top = mTop + (int) region.top; 12769 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12770 top + (int) (region.height() + .5f)); 12771 } 12772 } 12773 return more; 12774 } 12775 12776 /** 12777 * This method is called by getDisplayList() when a display list is created or re-rendered. 12778 * It sets or resets the current value of all properties on that display list (resetting is 12779 * necessary when a display list is being re-created, because we need to make sure that 12780 * previously-set transform values 12781 */ 12782 void setDisplayListProperties(DisplayList displayList) { 12783 if (displayList != null) { 12784 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12785 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12786 if (mParent instanceof ViewGroup) { 12787 displayList.setClipChildren( 12788 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12789 } 12790 float alpha = 1; 12791 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12792 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12793 ViewGroup parentVG = (ViewGroup) mParent; 12794 final boolean hasTransform = 12795 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12796 if (hasTransform) { 12797 Transformation transform = parentVG.mChildTransformation; 12798 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12799 if (transformType != Transformation.TYPE_IDENTITY) { 12800 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12801 alpha = transform.getAlpha(); 12802 } 12803 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12804 displayList.setStaticMatrix(transform.getMatrix()); 12805 } 12806 } 12807 } 12808 } 12809 if (mTransformationInfo != null) { 12810 alpha *= mTransformationInfo.mAlpha; 12811 if (alpha < 1) { 12812 final int multipliedAlpha = (int) (255 * alpha); 12813 if (onSetAlpha(multipliedAlpha)) { 12814 alpha = 1; 12815 } 12816 } 12817 displayList.setTransformationInfo(alpha, 12818 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12819 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12820 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12821 mTransformationInfo.mScaleY); 12822 if (mTransformationInfo.mCamera == null) { 12823 mTransformationInfo.mCamera = new Camera(); 12824 mTransformationInfo.matrix3D = new Matrix(); 12825 } 12826 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12827 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12828 displayList.setPivotX(getPivotX()); 12829 displayList.setPivotY(getPivotY()); 12830 } 12831 } else if (alpha < 1) { 12832 displayList.setAlpha(alpha); 12833 } 12834 } 12835 } 12836 12837 /** 12838 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12839 * This draw() method is an implementation detail and is not intended to be overridden or 12840 * to be called from anywhere else other than ViewGroup.drawChild(). 12841 */ 12842 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12843 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12844 boolean more = false; 12845 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12846 final int flags = parent.mGroupFlags; 12847 12848 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12849 parent.mChildTransformation.clear(); 12850 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12851 } 12852 12853 Transformation transformToApply = null; 12854 boolean concatMatrix = false; 12855 12856 boolean scalingRequired = false; 12857 boolean caching; 12858 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12859 12860 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12861 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12862 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12863 caching = true; 12864 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12865 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12866 } else { 12867 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12868 } 12869 12870 final Animation a = getAnimation(); 12871 if (a != null) { 12872 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12873 concatMatrix = a.willChangeTransformationMatrix(); 12874 if (concatMatrix) { 12875 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12876 } 12877 transformToApply = parent.mChildTransformation; 12878 } else { 12879 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12880 mDisplayList != null) { 12881 // No longer animating: clear out old animation matrix 12882 mDisplayList.setAnimationMatrix(null); 12883 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12884 } 12885 if (!useDisplayListProperties && 12886 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12887 final boolean hasTransform = 12888 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12889 if (hasTransform) { 12890 final int transformType = parent.mChildTransformation.getTransformationType(); 12891 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12892 parent.mChildTransformation : null; 12893 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12894 } 12895 } 12896 } 12897 12898 concatMatrix |= !childHasIdentityMatrix; 12899 12900 // Sets the flag as early as possible to allow draw() implementations 12901 // to call invalidate() successfully when doing animations 12902 mPrivateFlags |= DRAWN; 12903 12904 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12905 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12906 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12907 return more; 12908 } 12909 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12910 12911 if (hardwareAccelerated) { 12912 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12913 // retain the flag's value temporarily in the mRecreateDisplayList flag 12914 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12915 mPrivateFlags &= ~INVALIDATED; 12916 } 12917 12918 computeScroll(); 12919 12920 final int sx = mScrollX; 12921 final int sy = mScrollY; 12922 12923 DisplayList displayList = null; 12924 Bitmap cache = null; 12925 boolean hasDisplayList = false; 12926 if (caching) { 12927 if (!hardwareAccelerated) { 12928 if (layerType != LAYER_TYPE_NONE) { 12929 layerType = LAYER_TYPE_SOFTWARE; 12930 buildDrawingCache(true); 12931 } 12932 cache = getDrawingCache(true); 12933 } else { 12934 switch (layerType) { 12935 case LAYER_TYPE_SOFTWARE: 12936 if (useDisplayListProperties) { 12937 hasDisplayList = canHaveDisplayList(); 12938 } else { 12939 buildDrawingCache(true); 12940 cache = getDrawingCache(true); 12941 } 12942 break; 12943 case LAYER_TYPE_HARDWARE: 12944 if (useDisplayListProperties) { 12945 hasDisplayList = canHaveDisplayList(); 12946 } 12947 break; 12948 case LAYER_TYPE_NONE: 12949 // Delay getting the display list until animation-driven alpha values are 12950 // set up and possibly passed on to the view 12951 hasDisplayList = canHaveDisplayList(); 12952 break; 12953 } 12954 } 12955 } 12956 useDisplayListProperties &= hasDisplayList; 12957 if (useDisplayListProperties) { 12958 displayList = getDisplayList(); 12959 if (!displayList.isValid()) { 12960 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12961 // to getDisplayList(), the display list will be marked invalid and we should not 12962 // try to use it again. 12963 displayList = null; 12964 hasDisplayList = false; 12965 useDisplayListProperties = false; 12966 } 12967 } 12968 12969 final boolean hasNoCache = cache == null || hasDisplayList; 12970 final boolean offsetForScroll = cache == null && !hasDisplayList && 12971 layerType != LAYER_TYPE_HARDWARE; 12972 12973 int restoreTo = -1; 12974 if (!useDisplayListProperties || transformToApply != null) { 12975 restoreTo = canvas.save(); 12976 } 12977 if (offsetForScroll) { 12978 canvas.translate(mLeft - sx, mTop - sy); 12979 } else { 12980 if (!useDisplayListProperties) { 12981 canvas.translate(mLeft, mTop); 12982 } 12983 if (scalingRequired) { 12984 if (useDisplayListProperties) { 12985 // TODO: Might not need this if we put everything inside the DL 12986 restoreTo = canvas.save(); 12987 } 12988 // mAttachInfo cannot be null, otherwise scalingRequired == false 12989 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12990 canvas.scale(scale, scale); 12991 } 12992 } 12993 12994 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12995 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12996 if (transformToApply != null || !childHasIdentityMatrix) { 12997 int transX = 0; 12998 int transY = 0; 12999 13000 if (offsetForScroll) { 13001 transX = -sx; 13002 transY = -sy; 13003 } 13004 13005 if (transformToApply != null) { 13006 if (concatMatrix) { 13007 if (useDisplayListProperties) { 13008 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13009 } else { 13010 // Undo the scroll translation, apply the transformation matrix, 13011 // then redo the scroll translate to get the correct result. 13012 canvas.translate(-transX, -transY); 13013 canvas.concat(transformToApply.getMatrix()); 13014 canvas.translate(transX, transY); 13015 } 13016 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13017 } 13018 13019 float transformAlpha = transformToApply.getAlpha(); 13020 if (transformAlpha < 1) { 13021 alpha *= transformToApply.getAlpha(); 13022 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13023 } 13024 } 13025 13026 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13027 canvas.translate(-transX, -transY); 13028 canvas.concat(getMatrix()); 13029 canvas.translate(transX, transY); 13030 } 13031 } 13032 13033 if (alpha < 1) { 13034 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13035 if (hasNoCache) { 13036 final int multipliedAlpha = (int) (255 * alpha); 13037 if (!onSetAlpha(multipliedAlpha)) { 13038 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13039 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13040 layerType != LAYER_TYPE_NONE) { 13041 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13042 } 13043 if (useDisplayListProperties) { 13044 displayList.setAlpha(alpha * getAlpha()); 13045 } else if (layerType == LAYER_TYPE_NONE) { 13046 final int scrollX = hasDisplayList ? 0 : sx; 13047 final int scrollY = hasDisplayList ? 0 : sy; 13048 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13049 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13050 } 13051 } else { 13052 // Alpha is handled by the child directly, clobber the layer's alpha 13053 mPrivateFlags |= ALPHA_SET; 13054 } 13055 } 13056 } 13057 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13058 onSetAlpha(255); 13059 mPrivateFlags &= ~ALPHA_SET; 13060 } 13061 13062 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13063 !useDisplayListProperties) { 13064 if (offsetForScroll) { 13065 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13066 } else { 13067 if (!scalingRequired || cache == null) { 13068 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13069 } else { 13070 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13071 } 13072 } 13073 } 13074 13075 if (!useDisplayListProperties && hasDisplayList) { 13076 displayList = getDisplayList(); 13077 if (!displayList.isValid()) { 13078 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13079 // to getDisplayList(), the display list will be marked invalid and we should not 13080 // try to use it again. 13081 displayList = null; 13082 hasDisplayList = false; 13083 } 13084 } 13085 13086 if (hasNoCache) { 13087 boolean layerRendered = false; 13088 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13089 final HardwareLayer layer = getHardwareLayer(); 13090 if (layer != null && layer.isValid()) { 13091 mLayerPaint.setAlpha((int) (alpha * 255)); 13092 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13093 layerRendered = true; 13094 } else { 13095 final int scrollX = hasDisplayList ? 0 : sx; 13096 final int scrollY = hasDisplayList ? 0 : sy; 13097 canvas.saveLayer(scrollX, scrollY, 13098 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13099 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13100 } 13101 } 13102 13103 if (!layerRendered) { 13104 if (!hasDisplayList) { 13105 // Fast path for layouts with no backgrounds 13106 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13107 if (ViewDebug.TRACE_HIERARCHY) { 13108 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 13109 } 13110 mPrivateFlags &= ~DIRTY_MASK; 13111 dispatchDraw(canvas); 13112 } else { 13113 draw(canvas); 13114 } 13115 } else { 13116 mPrivateFlags &= ~DIRTY_MASK; 13117 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13118 } 13119 } 13120 } else if (cache != null) { 13121 mPrivateFlags &= ~DIRTY_MASK; 13122 Paint cachePaint; 13123 13124 if (layerType == LAYER_TYPE_NONE) { 13125 cachePaint = parent.mCachePaint; 13126 if (cachePaint == null) { 13127 cachePaint = new Paint(); 13128 cachePaint.setDither(false); 13129 parent.mCachePaint = cachePaint; 13130 } 13131 if (alpha < 1) { 13132 cachePaint.setAlpha((int) (alpha * 255)); 13133 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13134 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13135 cachePaint.setAlpha(255); 13136 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13137 } 13138 } else { 13139 cachePaint = mLayerPaint; 13140 cachePaint.setAlpha((int) (alpha * 255)); 13141 } 13142 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13143 } 13144 13145 if (restoreTo >= 0) { 13146 canvas.restoreToCount(restoreTo); 13147 } 13148 13149 if (a != null && !more) { 13150 if (!hardwareAccelerated && !a.getFillAfter()) { 13151 onSetAlpha(255); 13152 } 13153 parent.finishAnimatingView(this, a); 13154 } 13155 13156 if (more && hardwareAccelerated) { 13157 // invalidation is the trigger to recreate display lists, so if we're using 13158 // display lists to render, force an invalidate to allow the animation to 13159 // continue drawing another frame 13160 parent.invalidate(true); 13161 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13162 // alpha animations should cause the child to recreate its display list 13163 invalidate(true); 13164 } 13165 } 13166 13167 mRecreateDisplayList = false; 13168 13169 return more; 13170 } 13171 13172 /** 13173 * Manually render this view (and all of its children) to the given Canvas. 13174 * The view must have already done a full layout before this function is 13175 * called. When implementing a view, implement 13176 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13177 * If you do need to override this method, call the superclass version. 13178 * 13179 * @param canvas The Canvas to which the View is rendered. 13180 */ 13181 public void draw(Canvas canvas) { 13182 if (ViewDebug.TRACE_HIERARCHY) { 13183 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13184 } 13185 13186 final int privateFlags = mPrivateFlags; 13187 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13188 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13189 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13190 13191 /* 13192 * Draw traversal performs several drawing steps which must be executed 13193 * in the appropriate order: 13194 * 13195 * 1. Draw the background 13196 * 2. If necessary, save the canvas' layers to prepare for fading 13197 * 3. Draw view's content 13198 * 4. Draw children 13199 * 5. If necessary, draw the fading edges and restore layers 13200 * 6. Draw decorations (scrollbars for instance) 13201 */ 13202 13203 // Step 1, draw the background, if needed 13204 int saveCount; 13205 13206 if (!dirtyOpaque) { 13207 final Drawable background = mBackground; 13208 if (background != null) { 13209 final int scrollX = mScrollX; 13210 final int scrollY = mScrollY; 13211 13212 if (mBackgroundSizeChanged) { 13213 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13214 mBackgroundSizeChanged = false; 13215 } 13216 13217 if ((scrollX | scrollY) == 0) { 13218 background.draw(canvas); 13219 } else { 13220 canvas.translate(scrollX, scrollY); 13221 background.draw(canvas); 13222 canvas.translate(-scrollX, -scrollY); 13223 } 13224 } 13225 } 13226 13227 // skip step 2 & 5 if possible (common case) 13228 final int viewFlags = mViewFlags; 13229 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13230 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13231 if (!verticalEdges && !horizontalEdges) { 13232 // Step 3, draw the content 13233 if (!dirtyOpaque) onDraw(canvas); 13234 13235 // Step 4, draw the children 13236 dispatchDraw(canvas); 13237 13238 // Step 6, draw decorations (scrollbars) 13239 onDrawScrollBars(canvas); 13240 13241 // we're done... 13242 return; 13243 } 13244 13245 /* 13246 * Here we do the full fledged routine... 13247 * (this is an uncommon case where speed matters less, 13248 * this is why we repeat some of the tests that have been 13249 * done above) 13250 */ 13251 13252 boolean drawTop = false; 13253 boolean drawBottom = false; 13254 boolean drawLeft = false; 13255 boolean drawRight = false; 13256 13257 float topFadeStrength = 0.0f; 13258 float bottomFadeStrength = 0.0f; 13259 float leftFadeStrength = 0.0f; 13260 float rightFadeStrength = 0.0f; 13261 13262 // Step 2, save the canvas' layers 13263 int paddingLeft = mPaddingLeft; 13264 13265 final boolean offsetRequired = isPaddingOffsetRequired(); 13266 if (offsetRequired) { 13267 paddingLeft += getLeftPaddingOffset(); 13268 } 13269 13270 int left = mScrollX + paddingLeft; 13271 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13272 int top = mScrollY + getFadeTop(offsetRequired); 13273 int bottom = top + getFadeHeight(offsetRequired); 13274 13275 if (offsetRequired) { 13276 right += getRightPaddingOffset(); 13277 bottom += getBottomPaddingOffset(); 13278 } 13279 13280 final ScrollabilityCache scrollabilityCache = mScrollCache; 13281 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13282 int length = (int) fadeHeight; 13283 13284 // clip the fade length if top and bottom fades overlap 13285 // overlapping fades produce odd-looking artifacts 13286 if (verticalEdges && (top + length > bottom - length)) { 13287 length = (bottom - top) / 2; 13288 } 13289 13290 // also clip horizontal fades if necessary 13291 if (horizontalEdges && (left + length > right - length)) { 13292 length = (right - left) / 2; 13293 } 13294 13295 if (verticalEdges) { 13296 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13297 drawTop = topFadeStrength * fadeHeight > 1.0f; 13298 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13299 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13300 } 13301 13302 if (horizontalEdges) { 13303 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13304 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13305 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13306 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13307 } 13308 13309 saveCount = canvas.getSaveCount(); 13310 13311 int solidColor = getSolidColor(); 13312 if (solidColor == 0) { 13313 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13314 13315 if (drawTop) { 13316 canvas.saveLayer(left, top, right, top + length, null, flags); 13317 } 13318 13319 if (drawBottom) { 13320 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13321 } 13322 13323 if (drawLeft) { 13324 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13325 } 13326 13327 if (drawRight) { 13328 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13329 } 13330 } else { 13331 scrollabilityCache.setFadeColor(solidColor); 13332 } 13333 13334 // Step 3, draw the content 13335 if (!dirtyOpaque) onDraw(canvas); 13336 13337 // Step 4, draw the children 13338 dispatchDraw(canvas); 13339 13340 // Step 5, draw the fade effect and restore layers 13341 final Paint p = scrollabilityCache.paint; 13342 final Matrix matrix = scrollabilityCache.matrix; 13343 final Shader fade = scrollabilityCache.shader; 13344 13345 if (drawTop) { 13346 matrix.setScale(1, fadeHeight * topFadeStrength); 13347 matrix.postTranslate(left, top); 13348 fade.setLocalMatrix(matrix); 13349 canvas.drawRect(left, top, right, top + length, p); 13350 } 13351 13352 if (drawBottom) { 13353 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13354 matrix.postRotate(180); 13355 matrix.postTranslate(left, bottom); 13356 fade.setLocalMatrix(matrix); 13357 canvas.drawRect(left, bottom - length, right, bottom, p); 13358 } 13359 13360 if (drawLeft) { 13361 matrix.setScale(1, fadeHeight * leftFadeStrength); 13362 matrix.postRotate(-90); 13363 matrix.postTranslate(left, top); 13364 fade.setLocalMatrix(matrix); 13365 canvas.drawRect(left, top, left + length, bottom, p); 13366 } 13367 13368 if (drawRight) { 13369 matrix.setScale(1, fadeHeight * rightFadeStrength); 13370 matrix.postRotate(90); 13371 matrix.postTranslate(right, top); 13372 fade.setLocalMatrix(matrix); 13373 canvas.drawRect(right - length, top, right, bottom, p); 13374 } 13375 13376 canvas.restoreToCount(saveCount); 13377 13378 // Step 6, draw decorations (scrollbars) 13379 onDrawScrollBars(canvas); 13380 } 13381 13382 /** 13383 * Override this if your view is known to always be drawn on top of a solid color background, 13384 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13385 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13386 * should be set to 0xFF. 13387 * 13388 * @see #setVerticalFadingEdgeEnabled(boolean) 13389 * @see #setHorizontalFadingEdgeEnabled(boolean) 13390 * 13391 * @return The known solid color background for this view, or 0 if the color may vary 13392 */ 13393 @ViewDebug.ExportedProperty(category = "drawing") 13394 public int getSolidColor() { 13395 return 0; 13396 } 13397 13398 /** 13399 * Build a human readable string representation of the specified view flags. 13400 * 13401 * @param flags the view flags to convert to a string 13402 * @return a String representing the supplied flags 13403 */ 13404 private static String printFlags(int flags) { 13405 String output = ""; 13406 int numFlags = 0; 13407 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13408 output += "TAKES_FOCUS"; 13409 numFlags++; 13410 } 13411 13412 switch (flags & VISIBILITY_MASK) { 13413 case INVISIBLE: 13414 if (numFlags > 0) { 13415 output += " "; 13416 } 13417 output += "INVISIBLE"; 13418 // USELESS HERE numFlags++; 13419 break; 13420 case GONE: 13421 if (numFlags > 0) { 13422 output += " "; 13423 } 13424 output += "GONE"; 13425 // USELESS HERE numFlags++; 13426 break; 13427 default: 13428 break; 13429 } 13430 return output; 13431 } 13432 13433 /** 13434 * Build a human readable string representation of the specified private 13435 * view flags. 13436 * 13437 * @param privateFlags the private view flags to convert to a string 13438 * @return a String representing the supplied flags 13439 */ 13440 private static String printPrivateFlags(int privateFlags) { 13441 String output = ""; 13442 int numFlags = 0; 13443 13444 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13445 output += "WANTS_FOCUS"; 13446 numFlags++; 13447 } 13448 13449 if ((privateFlags & FOCUSED) == FOCUSED) { 13450 if (numFlags > 0) { 13451 output += " "; 13452 } 13453 output += "FOCUSED"; 13454 numFlags++; 13455 } 13456 13457 if ((privateFlags & SELECTED) == SELECTED) { 13458 if (numFlags > 0) { 13459 output += " "; 13460 } 13461 output += "SELECTED"; 13462 numFlags++; 13463 } 13464 13465 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13466 if (numFlags > 0) { 13467 output += " "; 13468 } 13469 output += "IS_ROOT_NAMESPACE"; 13470 numFlags++; 13471 } 13472 13473 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13474 if (numFlags > 0) { 13475 output += " "; 13476 } 13477 output += "HAS_BOUNDS"; 13478 numFlags++; 13479 } 13480 13481 if ((privateFlags & DRAWN) == DRAWN) { 13482 if (numFlags > 0) { 13483 output += " "; 13484 } 13485 output += "DRAWN"; 13486 // USELESS HERE numFlags++; 13487 } 13488 return output; 13489 } 13490 13491 /** 13492 * <p>Indicates whether or not this view's layout will be requested during 13493 * the next hierarchy layout pass.</p> 13494 * 13495 * @return true if the layout will be forced during next layout pass 13496 */ 13497 public boolean isLayoutRequested() { 13498 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13499 } 13500 13501 /** 13502 * Assign a size and position to a view and all of its 13503 * descendants 13504 * 13505 * <p>This is the second phase of the layout mechanism. 13506 * (The first is measuring). In this phase, each parent calls 13507 * layout on all of its children to position them. 13508 * This is typically done using the child measurements 13509 * that were stored in the measure pass().</p> 13510 * 13511 * <p>Derived classes should not override this method. 13512 * Derived classes with children should override 13513 * onLayout. In that method, they should 13514 * call layout on each of their children.</p> 13515 * 13516 * @param l Left position, relative to parent 13517 * @param t Top position, relative to parent 13518 * @param r Right position, relative to parent 13519 * @param b Bottom position, relative to parent 13520 */ 13521 @SuppressWarnings({"unchecked"}) 13522 public void layout(int l, int t, int r, int b) { 13523 int oldL = mLeft; 13524 int oldT = mTop; 13525 int oldB = mBottom; 13526 int oldR = mRight; 13527 boolean changed = setFrame(l, t, r, b); 13528 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13529 if (ViewDebug.TRACE_HIERARCHY) { 13530 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13531 } 13532 13533 onLayout(changed, l, t, r, b); 13534 mPrivateFlags &= ~LAYOUT_REQUIRED; 13535 13536 ListenerInfo li = mListenerInfo; 13537 if (li != null && li.mOnLayoutChangeListeners != null) { 13538 ArrayList<OnLayoutChangeListener> listenersCopy = 13539 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13540 int numListeners = listenersCopy.size(); 13541 for (int i = 0; i < numListeners; ++i) { 13542 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13543 } 13544 } 13545 } 13546 mPrivateFlags &= ~FORCE_LAYOUT; 13547 } 13548 13549 /** 13550 * Called from layout when this view should 13551 * assign a size and position to each of its children. 13552 * 13553 * Derived classes with children should override 13554 * this method and call layout on each of 13555 * their children. 13556 * @param changed This is a new size or position for this view 13557 * @param left Left position, relative to parent 13558 * @param top Top position, relative to parent 13559 * @param right Right position, relative to parent 13560 * @param bottom Bottom position, relative to parent 13561 */ 13562 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13563 } 13564 13565 /** 13566 * Assign a size and position to this view. 13567 * 13568 * This is called from layout. 13569 * 13570 * @param left Left position, relative to parent 13571 * @param top Top position, relative to parent 13572 * @param right Right position, relative to parent 13573 * @param bottom Bottom position, relative to parent 13574 * @return true if the new size and position are different than the 13575 * previous ones 13576 * {@hide} 13577 */ 13578 protected boolean setFrame(int left, int top, int right, int bottom) { 13579 boolean changed = false; 13580 13581 if (DBG) { 13582 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13583 + right + "," + bottom + ")"); 13584 } 13585 13586 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13587 changed = true; 13588 13589 // Remember our drawn bit 13590 int drawn = mPrivateFlags & DRAWN; 13591 13592 int oldWidth = mRight - mLeft; 13593 int oldHeight = mBottom - mTop; 13594 int newWidth = right - left; 13595 int newHeight = bottom - top; 13596 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13597 13598 // Invalidate our old position 13599 invalidate(sizeChanged); 13600 13601 mLeft = left; 13602 mTop = top; 13603 mRight = right; 13604 mBottom = bottom; 13605 if (mDisplayList != null) { 13606 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13607 } 13608 13609 mPrivateFlags |= HAS_BOUNDS; 13610 13611 13612 if (sizeChanged) { 13613 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13614 // A change in dimension means an auto-centered pivot point changes, too 13615 if (mTransformationInfo != null) { 13616 mTransformationInfo.mMatrixDirty = true; 13617 } 13618 } 13619 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13620 } 13621 13622 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13623 // If we are visible, force the DRAWN bit to on so that 13624 // this invalidate will go through (at least to our parent). 13625 // This is because someone may have invalidated this view 13626 // before this call to setFrame came in, thereby clearing 13627 // the DRAWN bit. 13628 mPrivateFlags |= DRAWN; 13629 invalidate(sizeChanged); 13630 // parent display list may need to be recreated based on a change in the bounds 13631 // of any child 13632 invalidateParentCaches(); 13633 } 13634 13635 // Reset drawn bit to original value (invalidate turns it off) 13636 mPrivateFlags |= drawn; 13637 13638 mBackgroundSizeChanged = true; 13639 } 13640 return changed; 13641 } 13642 13643 /** 13644 * Finalize inflating a view from XML. This is called as the last phase 13645 * of inflation, after all child views have been added. 13646 * 13647 * <p>Even if the subclass overrides onFinishInflate, they should always be 13648 * sure to call the super method, so that we get called. 13649 */ 13650 protected void onFinishInflate() { 13651 } 13652 13653 /** 13654 * Returns the resources associated with this view. 13655 * 13656 * @return Resources object. 13657 */ 13658 public Resources getResources() { 13659 return mResources; 13660 } 13661 13662 /** 13663 * Invalidates the specified Drawable. 13664 * 13665 * @param drawable the drawable to invalidate 13666 */ 13667 public void invalidateDrawable(Drawable drawable) { 13668 if (verifyDrawable(drawable)) { 13669 final Rect dirty = drawable.getBounds(); 13670 final int scrollX = mScrollX; 13671 final int scrollY = mScrollY; 13672 13673 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13674 dirty.right + scrollX, dirty.bottom + scrollY); 13675 } 13676 } 13677 13678 /** 13679 * Schedules an action on a drawable to occur at a specified time. 13680 * 13681 * @param who the recipient of the action 13682 * @param what the action to run on the drawable 13683 * @param when the time at which the action must occur. Uses the 13684 * {@link SystemClock#uptimeMillis} timebase. 13685 */ 13686 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13687 if (verifyDrawable(who) && what != null) { 13688 final long delay = when - SystemClock.uptimeMillis(); 13689 if (mAttachInfo != null) { 13690 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13691 Choreographer.CALLBACK_ANIMATION, what, who, 13692 Choreographer.subtractFrameDelay(delay)); 13693 } else { 13694 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13695 } 13696 } 13697 } 13698 13699 /** 13700 * Cancels a scheduled action on a drawable. 13701 * 13702 * @param who the recipient of the action 13703 * @param what the action to cancel 13704 */ 13705 public void unscheduleDrawable(Drawable who, Runnable what) { 13706 if (verifyDrawable(who) && what != null) { 13707 if (mAttachInfo != null) { 13708 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13709 Choreographer.CALLBACK_ANIMATION, what, who); 13710 } else { 13711 ViewRootImpl.getRunQueue().removeCallbacks(what); 13712 } 13713 } 13714 } 13715 13716 /** 13717 * Unschedule any events associated with the given Drawable. This can be 13718 * used when selecting a new Drawable into a view, so that the previous 13719 * one is completely unscheduled. 13720 * 13721 * @param who The Drawable to unschedule. 13722 * 13723 * @see #drawableStateChanged 13724 */ 13725 public void unscheduleDrawable(Drawable who) { 13726 if (mAttachInfo != null && who != null) { 13727 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13728 Choreographer.CALLBACK_ANIMATION, null, who); 13729 } 13730 } 13731 13732 /** 13733 * Return the layout direction of a given Drawable. 13734 * 13735 * @param who the Drawable to query 13736 * @hide 13737 */ 13738 public int getResolvedLayoutDirection(Drawable who) { 13739 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13740 } 13741 13742 /** 13743 * If your view subclass is displaying its own Drawable objects, it should 13744 * override this function and return true for any Drawable it is 13745 * displaying. This allows animations for those drawables to be 13746 * scheduled. 13747 * 13748 * <p>Be sure to call through to the super class when overriding this 13749 * function. 13750 * 13751 * @param who The Drawable to verify. Return true if it is one you are 13752 * displaying, else return the result of calling through to the 13753 * super class. 13754 * 13755 * @return boolean If true than the Drawable is being displayed in the 13756 * view; else false and it is not allowed to animate. 13757 * 13758 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13759 * @see #drawableStateChanged() 13760 */ 13761 protected boolean verifyDrawable(Drawable who) { 13762 return who == mBackground; 13763 } 13764 13765 /** 13766 * This function is called whenever the state of the view changes in such 13767 * a way that it impacts the state of drawables being shown. 13768 * 13769 * <p>Be sure to call through to the superclass when overriding this 13770 * function. 13771 * 13772 * @see Drawable#setState(int[]) 13773 */ 13774 protected void drawableStateChanged() { 13775 Drawable d = mBackground; 13776 if (d != null && d.isStateful()) { 13777 d.setState(getDrawableState()); 13778 } 13779 } 13780 13781 /** 13782 * Call this to force a view to update its drawable state. This will cause 13783 * drawableStateChanged to be called on this view. Views that are interested 13784 * in the new state should call getDrawableState. 13785 * 13786 * @see #drawableStateChanged 13787 * @see #getDrawableState 13788 */ 13789 public void refreshDrawableState() { 13790 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13791 drawableStateChanged(); 13792 13793 ViewParent parent = mParent; 13794 if (parent != null) { 13795 parent.childDrawableStateChanged(this); 13796 } 13797 } 13798 13799 /** 13800 * Return an array of resource IDs of the drawable states representing the 13801 * current state of the view. 13802 * 13803 * @return The current drawable state 13804 * 13805 * @see Drawable#setState(int[]) 13806 * @see #drawableStateChanged() 13807 * @see #onCreateDrawableState(int) 13808 */ 13809 public final int[] getDrawableState() { 13810 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13811 return mDrawableState; 13812 } else { 13813 mDrawableState = onCreateDrawableState(0); 13814 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13815 return mDrawableState; 13816 } 13817 } 13818 13819 /** 13820 * Generate the new {@link android.graphics.drawable.Drawable} state for 13821 * this view. This is called by the view 13822 * system when the cached Drawable state is determined to be invalid. To 13823 * retrieve the current state, you should use {@link #getDrawableState}. 13824 * 13825 * @param extraSpace if non-zero, this is the number of extra entries you 13826 * would like in the returned array in which you can place your own 13827 * states. 13828 * 13829 * @return Returns an array holding the current {@link Drawable} state of 13830 * the view. 13831 * 13832 * @see #mergeDrawableStates(int[], int[]) 13833 */ 13834 protected int[] onCreateDrawableState(int extraSpace) { 13835 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13836 mParent instanceof View) { 13837 return ((View) mParent).onCreateDrawableState(extraSpace); 13838 } 13839 13840 int[] drawableState; 13841 13842 int privateFlags = mPrivateFlags; 13843 13844 int viewStateIndex = 0; 13845 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13846 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13847 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13848 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13849 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13850 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13851 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13852 HardwareRenderer.isAvailable()) { 13853 // This is set if HW acceleration is requested, even if the current 13854 // process doesn't allow it. This is just to allow app preview 13855 // windows to better match their app. 13856 viewStateIndex |= VIEW_STATE_ACCELERATED; 13857 } 13858 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13859 13860 final int privateFlags2 = mPrivateFlags2; 13861 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13862 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13863 13864 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13865 13866 //noinspection ConstantIfStatement 13867 if (false) { 13868 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13869 Log.i("View", toString() 13870 + " pressed=" + ((privateFlags & PRESSED) != 0) 13871 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13872 + " fo=" + hasFocus() 13873 + " sl=" + ((privateFlags & SELECTED) != 0) 13874 + " wf=" + hasWindowFocus() 13875 + ": " + Arrays.toString(drawableState)); 13876 } 13877 13878 if (extraSpace == 0) { 13879 return drawableState; 13880 } 13881 13882 final int[] fullState; 13883 if (drawableState != null) { 13884 fullState = new int[drawableState.length + extraSpace]; 13885 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13886 } else { 13887 fullState = new int[extraSpace]; 13888 } 13889 13890 return fullState; 13891 } 13892 13893 /** 13894 * Merge your own state values in <var>additionalState</var> into the base 13895 * state values <var>baseState</var> that were returned by 13896 * {@link #onCreateDrawableState(int)}. 13897 * 13898 * @param baseState The base state values returned by 13899 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13900 * own additional state values. 13901 * 13902 * @param additionalState The additional state values you would like 13903 * added to <var>baseState</var>; this array is not modified. 13904 * 13905 * @return As a convenience, the <var>baseState</var> array you originally 13906 * passed into the function is returned. 13907 * 13908 * @see #onCreateDrawableState(int) 13909 */ 13910 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13911 final int N = baseState.length; 13912 int i = N - 1; 13913 while (i >= 0 && baseState[i] == 0) { 13914 i--; 13915 } 13916 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13917 return baseState; 13918 } 13919 13920 /** 13921 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13922 * on all Drawable objects associated with this view. 13923 */ 13924 public void jumpDrawablesToCurrentState() { 13925 if (mBackground != null) { 13926 mBackground.jumpToCurrentState(); 13927 } 13928 } 13929 13930 /** 13931 * Sets the background color for this view. 13932 * @param color the color of the background 13933 */ 13934 @RemotableViewMethod 13935 public void setBackgroundColor(int color) { 13936 if (mBackground instanceof ColorDrawable) { 13937 ((ColorDrawable) mBackground).setColor(color); 13938 } else { 13939 setBackground(new ColorDrawable(color)); 13940 } 13941 } 13942 13943 /** 13944 * Set the background to a given resource. The resource should refer to 13945 * a Drawable object or 0 to remove the background. 13946 * @param resid The identifier of the resource. 13947 * 13948 * @attr ref android.R.styleable#View_background 13949 */ 13950 @RemotableViewMethod 13951 public void setBackgroundResource(int resid) { 13952 if (resid != 0 && resid == mBackgroundResource) { 13953 return; 13954 } 13955 13956 Drawable d= null; 13957 if (resid != 0) { 13958 d = mResources.getDrawable(resid); 13959 } 13960 setBackground(d); 13961 13962 mBackgroundResource = resid; 13963 } 13964 13965 /** 13966 * Set the background to a given Drawable, or remove the background. If the 13967 * background has padding, this View's padding is set to the background's 13968 * padding. However, when a background is removed, this View's padding isn't 13969 * touched. If setting the padding is desired, please use 13970 * {@link #setPadding(int, int, int, int)}. 13971 * 13972 * @param background The Drawable to use as the background, or null to remove the 13973 * background 13974 */ 13975 public void setBackground(Drawable background) { 13976 //noinspection deprecation 13977 setBackgroundDrawable(background); 13978 } 13979 13980 /** 13981 * @deprecated use {@link #setBackground(Drawable)} instead 13982 */ 13983 @Deprecated 13984 public void setBackgroundDrawable(Drawable background) { 13985 if (background == mBackground) { 13986 return; 13987 } 13988 13989 boolean requestLayout = false; 13990 13991 mBackgroundResource = 0; 13992 13993 /* 13994 * Regardless of whether we're setting a new background or not, we want 13995 * to clear the previous drawable. 13996 */ 13997 if (mBackground != null) { 13998 mBackground.setCallback(null); 13999 unscheduleDrawable(mBackground); 14000 } 14001 14002 if (background != null) { 14003 Rect padding = sThreadLocal.get(); 14004 if (padding == null) { 14005 padding = new Rect(); 14006 sThreadLocal.set(padding); 14007 } 14008 if (background.getPadding(padding)) { 14009 switch (background.getResolvedLayoutDirectionSelf()) { 14010 case LAYOUT_DIRECTION_RTL: 14011 setPadding(padding.right, padding.top, padding.left, padding.bottom); 14012 break; 14013 case LAYOUT_DIRECTION_LTR: 14014 default: 14015 setPadding(padding.left, padding.top, padding.right, padding.bottom); 14016 } 14017 } 14018 14019 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14020 // if it has a different minimum size, we should layout again 14021 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14022 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14023 requestLayout = true; 14024 } 14025 14026 background.setCallback(this); 14027 if (background.isStateful()) { 14028 background.setState(getDrawableState()); 14029 } 14030 background.setVisible(getVisibility() == VISIBLE, false); 14031 mBackground = background; 14032 14033 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14034 mPrivateFlags &= ~SKIP_DRAW; 14035 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14036 requestLayout = true; 14037 } 14038 } else { 14039 /* Remove the background */ 14040 mBackground = null; 14041 14042 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14043 /* 14044 * This view ONLY drew the background before and we're removing 14045 * the background, so now it won't draw anything 14046 * (hence we SKIP_DRAW) 14047 */ 14048 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14049 mPrivateFlags |= SKIP_DRAW; 14050 } 14051 14052 /* 14053 * When the background is set, we try to apply its padding to this 14054 * View. When the background is removed, we don't touch this View's 14055 * padding. This is noted in the Javadocs. Hence, we don't need to 14056 * requestLayout(), the invalidate() below is sufficient. 14057 */ 14058 14059 // The old background's minimum size could have affected this 14060 // View's layout, so let's requestLayout 14061 requestLayout = true; 14062 } 14063 14064 computeOpaqueFlags(); 14065 14066 if (requestLayout) { 14067 requestLayout(); 14068 } 14069 14070 mBackgroundSizeChanged = true; 14071 invalidate(true); 14072 } 14073 14074 /** 14075 * Gets the background drawable 14076 * 14077 * @return The drawable used as the background for this view, if any. 14078 * 14079 * @see #setBackground(Drawable) 14080 * 14081 * @attr ref android.R.styleable#View_background 14082 */ 14083 public Drawable getBackground() { 14084 return mBackground; 14085 } 14086 14087 /** 14088 * Sets the padding. The view may add on the space required to display 14089 * the scrollbars, depending on the style and visibility of the scrollbars. 14090 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14091 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14092 * from the values set in this call. 14093 * 14094 * @attr ref android.R.styleable#View_padding 14095 * @attr ref android.R.styleable#View_paddingBottom 14096 * @attr ref android.R.styleable#View_paddingLeft 14097 * @attr ref android.R.styleable#View_paddingRight 14098 * @attr ref android.R.styleable#View_paddingTop 14099 * @param left the left padding in pixels 14100 * @param top the top padding in pixels 14101 * @param right the right padding in pixels 14102 * @param bottom the bottom padding in pixels 14103 */ 14104 public void setPadding(int left, int top, int right, int bottom) { 14105 mUserPaddingStart = -1; 14106 mUserPaddingEnd = -1; 14107 mUserPaddingRelative = false; 14108 14109 internalSetPadding(left, top, right, bottom); 14110 } 14111 14112 private void internalSetPadding(int left, int top, int right, int bottom) { 14113 mUserPaddingLeft = left; 14114 mUserPaddingRight = right; 14115 mUserPaddingBottom = bottom; 14116 14117 final int viewFlags = mViewFlags; 14118 boolean changed = false; 14119 14120 // Common case is there are no scroll bars. 14121 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14122 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14123 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14124 ? 0 : getVerticalScrollbarWidth(); 14125 switch (mVerticalScrollbarPosition) { 14126 case SCROLLBAR_POSITION_DEFAULT: 14127 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14128 left += offset; 14129 } else { 14130 right += offset; 14131 } 14132 break; 14133 case SCROLLBAR_POSITION_RIGHT: 14134 right += offset; 14135 break; 14136 case SCROLLBAR_POSITION_LEFT: 14137 left += offset; 14138 break; 14139 } 14140 } 14141 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14142 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14143 ? 0 : getHorizontalScrollbarHeight(); 14144 } 14145 } 14146 14147 if (mPaddingLeft != left) { 14148 changed = true; 14149 mPaddingLeft = left; 14150 } 14151 if (mPaddingTop != top) { 14152 changed = true; 14153 mPaddingTop = top; 14154 } 14155 if (mPaddingRight != right) { 14156 changed = true; 14157 mPaddingRight = right; 14158 } 14159 if (mPaddingBottom != bottom) { 14160 changed = true; 14161 mPaddingBottom = bottom; 14162 } 14163 14164 if (changed) { 14165 requestLayout(); 14166 } 14167 } 14168 14169 /** 14170 * Sets the relative padding. The view may add on the space required to display 14171 * the scrollbars, depending on the style and visibility of the scrollbars. 14172 * from the values set in this call. 14173 * 14174 * @param start the start padding in pixels 14175 * @param top the top padding in pixels 14176 * @param end the end padding in pixels 14177 * @param bottom the bottom padding in pixels 14178 * @hide 14179 */ 14180 public void setPaddingRelative(int start, int top, int end, int bottom) { 14181 mUserPaddingStart = start; 14182 mUserPaddingEnd = end; 14183 mUserPaddingRelative = true; 14184 14185 switch(getResolvedLayoutDirection()) { 14186 case LAYOUT_DIRECTION_RTL: 14187 internalSetPadding(end, top, start, bottom); 14188 break; 14189 case LAYOUT_DIRECTION_LTR: 14190 default: 14191 internalSetPadding(start, top, end, bottom); 14192 } 14193 } 14194 14195 /** 14196 * Returns the top padding of this view. 14197 * 14198 * @return the top padding in pixels 14199 */ 14200 public int getPaddingTop() { 14201 return mPaddingTop; 14202 } 14203 14204 /** 14205 * Returns the bottom padding of this view. If there are inset and enabled 14206 * scrollbars, this value may include the space required to display the 14207 * scrollbars as well. 14208 * 14209 * @return the bottom padding in pixels 14210 */ 14211 public int getPaddingBottom() { 14212 return mPaddingBottom; 14213 } 14214 14215 /** 14216 * Returns the left padding of this view. If there are inset and enabled 14217 * scrollbars, this value may include the space required to display the 14218 * scrollbars as well. 14219 * 14220 * @return the left padding in pixels 14221 */ 14222 public int getPaddingLeft() { 14223 return mPaddingLeft; 14224 } 14225 14226 /** 14227 * Returns the start padding of this view depending on its resolved layout direction. 14228 * If there are inset and enabled scrollbars, this value may include the space 14229 * required to display the scrollbars as well. 14230 * 14231 * @return the start padding in pixels 14232 * @hide 14233 */ 14234 public int getPaddingStart() { 14235 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14236 mPaddingRight : mPaddingLeft; 14237 } 14238 14239 /** 14240 * Returns the right padding of this view. If there are inset and enabled 14241 * scrollbars, this value may include the space required to display the 14242 * scrollbars as well. 14243 * 14244 * @return the right padding in pixels 14245 */ 14246 public int getPaddingRight() { 14247 return mPaddingRight; 14248 } 14249 14250 /** 14251 * Returns the end padding of this view depending on its resolved layout direction. 14252 * If there are inset and enabled scrollbars, this value may include the space 14253 * required to display the scrollbars as well. 14254 * 14255 * @return the end padding in pixels 14256 * @hide 14257 */ 14258 public int getPaddingEnd() { 14259 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14260 mPaddingLeft : mPaddingRight; 14261 } 14262 14263 /** 14264 * Return if the padding as been set thru relative values 14265 * {@link #setPaddingRelative(int, int, int, int)} 14266 * 14267 * @return true if the padding is relative or false if it is not. 14268 * @hide 14269 */ 14270 public boolean isPaddingRelative() { 14271 return mUserPaddingRelative; 14272 } 14273 14274 /** 14275 * @hide 14276 */ 14277 public Insets getOpticalInsets() { 14278 if (mLayoutInsets == null) { 14279 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14280 } 14281 return mLayoutInsets; 14282 } 14283 14284 /** 14285 * @hide 14286 */ 14287 public void setLayoutInsets(Insets layoutInsets) { 14288 mLayoutInsets = layoutInsets; 14289 } 14290 14291 /** 14292 * Changes the selection state of this view. A view can be selected or not. 14293 * Note that selection is not the same as focus. Views are typically 14294 * selected in the context of an AdapterView like ListView or GridView; 14295 * the selected view is the view that is highlighted. 14296 * 14297 * @param selected true if the view must be selected, false otherwise 14298 */ 14299 public void setSelected(boolean selected) { 14300 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14301 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14302 if (!selected) resetPressedState(); 14303 invalidate(true); 14304 refreshDrawableState(); 14305 dispatchSetSelected(selected); 14306 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14307 notifyAccessibilityStateChanged(); 14308 } 14309 } 14310 } 14311 14312 /** 14313 * Dispatch setSelected to all of this View's children. 14314 * 14315 * @see #setSelected(boolean) 14316 * 14317 * @param selected The new selected state 14318 */ 14319 protected void dispatchSetSelected(boolean selected) { 14320 } 14321 14322 /** 14323 * Indicates the selection state of this view. 14324 * 14325 * @return true if the view is selected, false otherwise 14326 */ 14327 @ViewDebug.ExportedProperty 14328 public boolean isSelected() { 14329 return (mPrivateFlags & SELECTED) != 0; 14330 } 14331 14332 /** 14333 * Changes the activated state of this view. A view can be activated or not. 14334 * Note that activation is not the same as selection. Selection is 14335 * a transient property, representing the view (hierarchy) the user is 14336 * currently interacting with. Activation is a longer-term state that the 14337 * user can move views in and out of. For example, in a list view with 14338 * single or multiple selection enabled, the views in the current selection 14339 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14340 * here.) The activated state is propagated down to children of the view it 14341 * is set on. 14342 * 14343 * @param activated true if the view must be activated, false otherwise 14344 */ 14345 public void setActivated(boolean activated) { 14346 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14347 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14348 invalidate(true); 14349 refreshDrawableState(); 14350 dispatchSetActivated(activated); 14351 } 14352 } 14353 14354 /** 14355 * Dispatch setActivated to all of this View's children. 14356 * 14357 * @see #setActivated(boolean) 14358 * 14359 * @param activated The new activated state 14360 */ 14361 protected void dispatchSetActivated(boolean activated) { 14362 } 14363 14364 /** 14365 * Indicates the activation state of this view. 14366 * 14367 * @return true if the view is activated, false otherwise 14368 */ 14369 @ViewDebug.ExportedProperty 14370 public boolean isActivated() { 14371 return (mPrivateFlags & ACTIVATED) != 0; 14372 } 14373 14374 /** 14375 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14376 * observer can be used to get notifications when global events, like 14377 * layout, happen. 14378 * 14379 * The returned ViewTreeObserver observer is not guaranteed to remain 14380 * valid for the lifetime of this View. If the caller of this method keeps 14381 * a long-lived reference to ViewTreeObserver, it should always check for 14382 * the return value of {@link ViewTreeObserver#isAlive()}. 14383 * 14384 * @return The ViewTreeObserver for this view's hierarchy. 14385 */ 14386 public ViewTreeObserver getViewTreeObserver() { 14387 if (mAttachInfo != null) { 14388 return mAttachInfo.mTreeObserver; 14389 } 14390 if (mFloatingTreeObserver == null) { 14391 mFloatingTreeObserver = new ViewTreeObserver(); 14392 } 14393 return mFloatingTreeObserver; 14394 } 14395 14396 /** 14397 * <p>Finds the topmost view in the current view hierarchy.</p> 14398 * 14399 * @return the topmost view containing this view 14400 */ 14401 public View getRootView() { 14402 if (mAttachInfo != null) { 14403 final View v = mAttachInfo.mRootView; 14404 if (v != null) { 14405 return v; 14406 } 14407 } 14408 14409 View parent = this; 14410 14411 while (parent.mParent != null && parent.mParent instanceof View) { 14412 parent = (View) parent.mParent; 14413 } 14414 14415 return parent; 14416 } 14417 14418 /** 14419 * <p>Computes the coordinates of this view on the screen. 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 getLocationOnScreen(int[] location) { 14426 getLocationInWindow(location); 14427 14428 final AttachInfo info = mAttachInfo; 14429 if (info != null) { 14430 location[0] += info.mWindowLeft; 14431 location[1] += info.mWindowTop; 14432 } 14433 } 14434 14435 /** 14436 * <p>Computes the coordinates of this view in its window. The argument 14437 * must be an array of two integers. After the method returns, the array 14438 * contains the x and y location in that order.</p> 14439 * 14440 * @param location an array of two integers in which to hold the coordinates 14441 */ 14442 public void getLocationInWindow(int[] location) { 14443 if (location == null || location.length < 2) { 14444 throw new IllegalArgumentException("location must be an array of two integers"); 14445 } 14446 14447 if (mAttachInfo == null) { 14448 // When the view is not attached to a window, this method does not make sense 14449 location[0] = location[1] = 0; 14450 return; 14451 } 14452 14453 float[] position = mAttachInfo.mTmpTransformLocation; 14454 position[0] = position[1] = 0.0f; 14455 14456 if (!hasIdentityMatrix()) { 14457 getMatrix().mapPoints(position); 14458 } 14459 14460 position[0] += mLeft; 14461 position[1] += mTop; 14462 14463 ViewParent viewParent = mParent; 14464 while (viewParent instanceof View) { 14465 final View view = (View) viewParent; 14466 14467 position[0] -= view.mScrollX; 14468 position[1] -= view.mScrollY; 14469 14470 if (!view.hasIdentityMatrix()) { 14471 view.getMatrix().mapPoints(position); 14472 } 14473 14474 position[0] += view.mLeft; 14475 position[1] += view.mTop; 14476 14477 viewParent = view.mParent; 14478 } 14479 14480 if (viewParent instanceof ViewRootImpl) { 14481 // *cough* 14482 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14483 position[1] -= vr.mCurScrollY; 14484 } 14485 14486 location[0] = (int) (position[0] + 0.5f); 14487 location[1] = (int) (position[1] + 0.5f); 14488 } 14489 14490 /** 14491 * {@hide} 14492 * @param id the id of the view to be found 14493 * @return the view of the specified id, null if cannot be found 14494 */ 14495 protected View findViewTraversal(int id) { 14496 if (id == mID) { 14497 return this; 14498 } 14499 return null; 14500 } 14501 14502 /** 14503 * {@hide} 14504 * @param tag the tag of the view to be found 14505 * @return the view of specified tag, null if cannot be found 14506 */ 14507 protected View findViewWithTagTraversal(Object tag) { 14508 if (tag != null && tag.equals(mTag)) { 14509 return this; 14510 } 14511 return null; 14512 } 14513 14514 /** 14515 * {@hide} 14516 * @param predicate The predicate to evaluate. 14517 * @param childToSkip If not null, ignores this child during the recursive traversal. 14518 * @return The first view that matches the predicate or null. 14519 */ 14520 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14521 if (predicate.apply(this)) { 14522 return this; 14523 } 14524 return null; 14525 } 14526 14527 /** 14528 * Look for a child view with the given id. If this view has the given 14529 * id, return this view. 14530 * 14531 * @param id The id to search for. 14532 * @return The view that has the given id in the hierarchy or null 14533 */ 14534 public final View findViewById(int id) { 14535 if (id < 0) { 14536 return null; 14537 } 14538 return findViewTraversal(id); 14539 } 14540 14541 /** 14542 * Finds a view by its unuque and stable accessibility id. 14543 * 14544 * @param accessibilityId The searched accessibility id. 14545 * @return The found view. 14546 */ 14547 final View findViewByAccessibilityId(int accessibilityId) { 14548 if (accessibilityId < 0) { 14549 return null; 14550 } 14551 return findViewByAccessibilityIdTraversal(accessibilityId); 14552 } 14553 14554 /** 14555 * Performs the traversal to find a view by its unuque and stable accessibility id. 14556 * 14557 * <strong>Note:</strong>This method does not stop at the root namespace 14558 * boundary since the user can touch the screen at an arbitrary location 14559 * potentially crossing the root namespace bounday which will send an 14560 * accessibility event to accessibility services and they should be able 14561 * to obtain the event source. Also accessibility ids are guaranteed to be 14562 * unique in the window. 14563 * 14564 * @param accessibilityId The accessibility id. 14565 * @return The found view. 14566 */ 14567 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14568 if (getAccessibilityViewId() == accessibilityId) { 14569 return this; 14570 } 14571 return null; 14572 } 14573 14574 /** 14575 * Look for a child view with the given tag. If this view has the given 14576 * tag, return this view. 14577 * 14578 * @param tag The tag to search for, using "tag.equals(getTag())". 14579 * @return The View that has the given tag in the hierarchy or null 14580 */ 14581 public final View findViewWithTag(Object tag) { 14582 if (tag == null) { 14583 return null; 14584 } 14585 return findViewWithTagTraversal(tag); 14586 } 14587 14588 /** 14589 * {@hide} 14590 * Look for a child view that matches the specified predicate. 14591 * If this view matches the predicate, return this view. 14592 * 14593 * @param predicate The predicate to evaluate. 14594 * @return The first view that matches the predicate or null. 14595 */ 14596 public final View findViewByPredicate(Predicate<View> predicate) { 14597 return findViewByPredicateTraversal(predicate, null); 14598 } 14599 14600 /** 14601 * {@hide} 14602 * Look for a child view that matches the specified predicate, 14603 * starting with the specified view and its descendents and then 14604 * recusively searching the ancestors and siblings of that view 14605 * until this view is reached. 14606 * 14607 * This method is useful in cases where the predicate does not match 14608 * a single unique view (perhaps multiple views use the same id) 14609 * and we are trying to find the view that is "closest" in scope to the 14610 * starting view. 14611 * 14612 * @param start The view to start from. 14613 * @param predicate The predicate to evaluate. 14614 * @return The first view that matches the predicate or null. 14615 */ 14616 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14617 View childToSkip = null; 14618 for (;;) { 14619 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14620 if (view != null || start == this) { 14621 return view; 14622 } 14623 14624 ViewParent parent = start.getParent(); 14625 if (parent == null || !(parent instanceof View)) { 14626 return null; 14627 } 14628 14629 childToSkip = start; 14630 start = (View) parent; 14631 } 14632 } 14633 14634 /** 14635 * Sets the identifier for this view. The identifier does not have to be 14636 * unique in this view's hierarchy. The identifier should be a positive 14637 * number. 14638 * 14639 * @see #NO_ID 14640 * @see #getId() 14641 * @see #findViewById(int) 14642 * 14643 * @param id a number used to identify the view 14644 * 14645 * @attr ref android.R.styleable#View_id 14646 */ 14647 public void setId(int id) { 14648 mID = id; 14649 } 14650 14651 /** 14652 * {@hide} 14653 * 14654 * @param isRoot true if the view belongs to the root namespace, false 14655 * otherwise 14656 */ 14657 public void setIsRootNamespace(boolean isRoot) { 14658 if (isRoot) { 14659 mPrivateFlags |= IS_ROOT_NAMESPACE; 14660 } else { 14661 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14662 } 14663 } 14664 14665 /** 14666 * {@hide} 14667 * 14668 * @return true if the view belongs to the root namespace, false otherwise 14669 */ 14670 public boolean isRootNamespace() { 14671 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14672 } 14673 14674 /** 14675 * Returns this view's identifier. 14676 * 14677 * @return a positive integer used to identify the view or {@link #NO_ID} 14678 * if the view has no ID 14679 * 14680 * @see #setId(int) 14681 * @see #findViewById(int) 14682 * @attr ref android.R.styleable#View_id 14683 */ 14684 @ViewDebug.CapturedViewProperty 14685 public int getId() { 14686 return mID; 14687 } 14688 14689 /** 14690 * Returns this view's tag. 14691 * 14692 * @return the Object stored in this view as a tag 14693 * 14694 * @see #setTag(Object) 14695 * @see #getTag(int) 14696 */ 14697 @ViewDebug.ExportedProperty 14698 public Object getTag() { 14699 return mTag; 14700 } 14701 14702 /** 14703 * Sets the tag associated with this view. A tag can be used to mark 14704 * a view in its hierarchy and does not have to be unique within the 14705 * hierarchy. Tags can also be used to store data within a view without 14706 * resorting to another data structure. 14707 * 14708 * @param tag an Object to tag the view with 14709 * 14710 * @see #getTag() 14711 * @see #setTag(int, Object) 14712 */ 14713 public void setTag(final Object tag) { 14714 mTag = tag; 14715 } 14716 14717 /** 14718 * Returns the tag associated with this view and the specified key. 14719 * 14720 * @param key The key identifying the tag 14721 * 14722 * @return the Object stored in this view as a tag 14723 * 14724 * @see #setTag(int, Object) 14725 * @see #getTag() 14726 */ 14727 public Object getTag(int key) { 14728 if (mKeyedTags != null) return mKeyedTags.get(key); 14729 return null; 14730 } 14731 14732 /** 14733 * Sets a tag associated with this view and a key. A tag can be used 14734 * to mark a view in its hierarchy and does not have to be unique within 14735 * the hierarchy. Tags can also be used to store data within a view 14736 * without resorting to another data structure. 14737 * 14738 * The specified key should be an id declared in the resources of the 14739 * application to ensure it is unique (see the <a 14740 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14741 * Keys identified as belonging to 14742 * the Android framework or not associated with any package will cause 14743 * an {@link IllegalArgumentException} to be thrown. 14744 * 14745 * @param key The key identifying the tag 14746 * @param tag An Object to tag the view with 14747 * 14748 * @throws IllegalArgumentException If they specified key is not valid 14749 * 14750 * @see #setTag(Object) 14751 * @see #getTag(int) 14752 */ 14753 public void setTag(int key, final Object tag) { 14754 // If the package id is 0x00 or 0x01, it's either an undefined package 14755 // or a framework id 14756 if ((key >>> 24) < 2) { 14757 throw new IllegalArgumentException("The key must be an application-specific " 14758 + "resource id."); 14759 } 14760 14761 setKeyedTag(key, tag); 14762 } 14763 14764 /** 14765 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14766 * framework id. 14767 * 14768 * @hide 14769 */ 14770 public void setTagInternal(int key, Object tag) { 14771 if ((key >>> 24) != 0x1) { 14772 throw new IllegalArgumentException("The key must be a framework-specific " 14773 + "resource id."); 14774 } 14775 14776 setKeyedTag(key, tag); 14777 } 14778 14779 private void setKeyedTag(int key, Object tag) { 14780 if (mKeyedTags == null) { 14781 mKeyedTags = new SparseArray<Object>(); 14782 } 14783 14784 mKeyedTags.put(key, tag); 14785 } 14786 14787 /** 14788 * @param consistency The type of consistency. See ViewDebug for more information. 14789 * 14790 * @hide 14791 */ 14792 protected boolean dispatchConsistencyCheck(int consistency) { 14793 return onConsistencyCheck(consistency); 14794 } 14795 14796 /** 14797 * Method that subclasses should implement to check their consistency. The type of 14798 * consistency check is indicated by the bit field passed as a parameter. 14799 * 14800 * @param consistency The type of consistency. See ViewDebug for more information. 14801 * 14802 * @throws IllegalStateException if the view is in an inconsistent state. 14803 * 14804 * @hide 14805 */ 14806 protected boolean onConsistencyCheck(int consistency) { 14807 boolean result = true; 14808 14809 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14810 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14811 14812 if (checkLayout) { 14813 if (getParent() == null) { 14814 result = false; 14815 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14816 "View " + this + " does not have a parent."); 14817 } 14818 14819 if (mAttachInfo == null) { 14820 result = false; 14821 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14822 "View " + this + " is not attached to a window."); 14823 } 14824 } 14825 14826 if (checkDrawing) { 14827 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14828 // from their draw() method 14829 14830 if ((mPrivateFlags & DRAWN) != DRAWN && 14831 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14832 result = false; 14833 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14834 "View " + this + " was invalidated but its drawing cache is valid."); 14835 } 14836 } 14837 14838 return result; 14839 } 14840 14841 /** 14842 * Prints information about this view in the log output, with the tag 14843 * {@link #VIEW_LOG_TAG}. 14844 * 14845 * @hide 14846 */ 14847 public void debug() { 14848 debug(0); 14849 } 14850 14851 /** 14852 * Prints information about this view in the log output, with the tag 14853 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14854 * indentation defined by the <code>depth</code>. 14855 * 14856 * @param depth the indentation level 14857 * 14858 * @hide 14859 */ 14860 protected void debug(int depth) { 14861 String output = debugIndent(depth - 1); 14862 14863 output += "+ " + this; 14864 int id = getId(); 14865 if (id != -1) { 14866 output += " (id=" + id + ")"; 14867 } 14868 Object tag = getTag(); 14869 if (tag != null) { 14870 output += " (tag=" + tag + ")"; 14871 } 14872 Log.d(VIEW_LOG_TAG, output); 14873 14874 if ((mPrivateFlags & FOCUSED) != 0) { 14875 output = debugIndent(depth) + " FOCUSED"; 14876 Log.d(VIEW_LOG_TAG, output); 14877 } 14878 14879 output = debugIndent(depth); 14880 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14881 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14882 + "} "; 14883 Log.d(VIEW_LOG_TAG, output); 14884 14885 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14886 || mPaddingBottom != 0) { 14887 output = debugIndent(depth); 14888 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14889 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14890 Log.d(VIEW_LOG_TAG, output); 14891 } 14892 14893 output = debugIndent(depth); 14894 output += "mMeasureWidth=" + mMeasuredWidth + 14895 " mMeasureHeight=" + mMeasuredHeight; 14896 Log.d(VIEW_LOG_TAG, output); 14897 14898 output = debugIndent(depth); 14899 if (mLayoutParams == null) { 14900 output += "BAD! no layout params"; 14901 } else { 14902 output = mLayoutParams.debug(output); 14903 } 14904 Log.d(VIEW_LOG_TAG, output); 14905 14906 output = debugIndent(depth); 14907 output += "flags={"; 14908 output += View.printFlags(mViewFlags); 14909 output += "}"; 14910 Log.d(VIEW_LOG_TAG, output); 14911 14912 output = debugIndent(depth); 14913 output += "privateFlags={"; 14914 output += View.printPrivateFlags(mPrivateFlags); 14915 output += "}"; 14916 Log.d(VIEW_LOG_TAG, output); 14917 } 14918 14919 /** 14920 * Creates a string of whitespaces used for indentation. 14921 * 14922 * @param depth the indentation level 14923 * @return a String containing (depth * 2 + 3) * 2 white spaces 14924 * 14925 * @hide 14926 */ 14927 protected static String debugIndent(int depth) { 14928 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14929 for (int i = 0; i < (depth * 2) + 3; i++) { 14930 spaces.append(' ').append(' '); 14931 } 14932 return spaces.toString(); 14933 } 14934 14935 /** 14936 * <p>Return the offset of the widget's text baseline from the widget's top 14937 * boundary. If this widget does not support baseline alignment, this 14938 * method returns -1. </p> 14939 * 14940 * @return the offset of the baseline within the widget's bounds or -1 14941 * if baseline alignment is not supported 14942 */ 14943 @ViewDebug.ExportedProperty(category = "layout") 14944 public int getBaseline() { 14945 return -1; 14946 } 14947 14948 /** 14949 * Call this when something has changed which has invalidated the 14950 * layout of this view. This will schedule a layout pass of the view 14951 * tree. 14952 */ 14953 public void requestLayout() { 14954 if (ViewDebug.TRACE_HIERARCHY) { 14955 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14956 } 14957 14958 mPrivateFlags |= FORCE_LAYOUT; 14959 mPrivateFlags |= INVALIDATED; 14960 14961 if (mLayoutParams != null) { 14962 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14963 } 14964 14965 if (mParent != null && !mParent.isLayoutRequested()) { 14966 mParent.requestLayout(); 14967 } 14968 } 14969 14970 /** 14971 * Forces this view to be laid out during the next layout pass. 14972 * This method does not call requestLayout() or forceLayout() 14973 * on the parent. 14974 */ 14975 public void forceLayout() { 14976 mPrivateFlags |= FORCE_LAYOUT; 14977 mPrivateFlags |= INVALIDATED; 14978 } 14979 14980 /** 14981 * <p> 14982 * This is called to find out how big a view should be. The parent 14983 * supplies constraint information in the width and height parameters. 14984 * </p> 14985 * 14986 * <p> 14987 * The actual measurement work of a view is performed in 14988 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14989 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14990 * </p> 14991 * 14992 * 14993 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14994 * parent 14995 * @param heightMeasureSpec Vertical space requirements as imposed by the 14996 * parent 14997 * 14998 * @see #onMeasure(int, int) 14999 */ 15000 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15001 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 15002 widthMeasureSpec != mOldWidthMeasureSpec || 15003 heightMeasureSpec != mOldHeightMeasureSpec) { 15004 15005 // first clears the measured dimension flag 15006 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 15007 15008 if (ViewDebug.TRACE_HIERARCHY) { 15009 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 15010 } 15011 15012 // measure ourselves, this should set the measured dimension flag back 15013 onMeasure(widthMeasureSpec, heightMeasureSpec); 15014 15015 // flag not set, setMeasuredDimension() was not invoked, we raise 15016 // an exception to warn the developer 15017 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 15018 throw new IllegalStateException("onMeasure() did not set the" 15019 + " measured dimension by calling" 15020 + " setMeasuredDimension()"); 15021 } 15022 15023 mPrivateFlags |= LAYOUT_REQUIRED; 15024 } 15025 15026 mOldWidthMeasureSpec = widthMeasureSpec; 15027 mOldHeightMeasureSpec = heightMeasureSpec; 15028 } 15029 15030 /** 15031 * <p> 15032 * Measure the view and its content to determine the measured width and the 15033 * measured height. This method is invoked by {@link #measure(int, int)} and 15034 * should be overriden by subclasses to provide accurate and efficient 15035 * measurement of their contents. 15036 * </p> 15037 * 15038 * <p> 15039 * <strong>CONTRACT:</strong> When overriding this method, you 15040 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15041 * measured width and height of this view. Failure to do so will trigger an 15042 * <code>IllegalStateException</code>, thrown by 15043 * {@link #measure(int, int)}. Calling the superclass' 15044 * {@link #onMeasure(int, int)} is a valid use. 15045 * </p> 15046 * 15047 * <p> 15048 * The base class implementation of measure defaults to the background size, 15049 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15050 * override {@link #onMeasure(int, int)} to provide better measurements of 15051 * their content. 15052 * </p> 15053 * 15054 * <p> 15055 * If this method is overridden, it is the subclass's responsibility to make 15056 * sure the measured height and width are at least the view's minimum height 15057 * and width ({@link #getSuggestedMinimumHeight()} and 15058 * {@link #getSuggestedMinimumWidth()}). 15059 * </p> 15060 * 15061 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15062 * The requirements are encoded with 15063 * {@link android.view.View.MeasureSpec}. 15064 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15065 * The requirements are encoded with 15066 * {@link android.view.View.MeasureSpec}. 15067 * 15068 * @see #getMeasuredWidth() 15069 * @see #getMeasuredHeight() 15070 * @see #setMeasuredDimension(int, int) 15071 * @see #getSuggestedMinimumHeight() 15072 * @see #getSuggestedMinimumWidth() 15073 * @see android.view.View.MeasureSpec#getMode(int) 15074 * @see android.view.View.MeasureSpec#getSize(int) 15075 */ 15076 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15077 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15078 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15079 } 15080 15081 /** 15082 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15083 * measured width and measured height. Failing to do so will trigger an 15084 * exception at measurement time.</p> 15085 * 15086 * @param measuredWidth The measured width of this view. May be a complex 15087 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15088 * {@link #MEASURED_STATE_TOO_SMALL}. 15089 * @param measuredHeight The measured height of this view. May be a complex 15090 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15091 * {@link #MEASURED_STATE_TOO_SMALL}. 15092 */ 15093 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15094 mMeasuredWidth = measuredWidth; 15095 mMeasuredHeight = measuredHeight; 15096 15097 mPrivateFlags |= MEASURED_DIMENSION_SET; 15098 } 15099 15100 /** 15101 * Merge two states as returned by {@link #getMeasuredState()}. 15102 * @param curState The current state as returned from a view or the result 15103 * of combining multiple views. 15104 * @param newState The new view state to combine. 15105 * @return Returns a new integer reflecting the combination of the two 15106 * states. 15107 */ 15108 public static int combineMeasuredStates(int curState, int newState) { 15109 return curState | newState; 15110 } 15111 15112 /** 15113 * Version of {@link #resolveSizeAndState(int, int, int)} 15114 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15115 */ 15116 public static int resolveSize(int size, int measureSpec) { 15117 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15118 } 15119 15120 /** 15121 * Utility to reconcile a desired size and state, with constraints imposed 15122 * by a MeasureSpec. Will take the desired size, unless a different size 15123 * is imposed by the constraints. The returned value is a compound integer, 15124 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15125 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15126 * size is smaller than the size the view wants to be. 15127 * 15128 * @param size How big the view wants to be 15129 * @param measureSpec Constraints imposed by the parent 15130 * @return Size information bit mask as defined by 15131 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15132 */ 15133 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15134 int result = size; 15135 int specMode = MeasureSpec.getMode(measureSpec); 15136 int specSize = MeasureSpec.getSize(measureSpec); 15137 switch (specMode) { 15138 case MeasureSpec.UNSPECIFIED: 15139 result = size; 15140 break; 15141 case MeasureSpec.AT_MOST: 15142 if (specSize < size) { 15143 result = specSize | MEASURED_STATE_TOO_SMALL; 15144 } else { 15145 result = size; 15146 } 15147 break; 15148 case MeasureSpec.EXACTLY: 15149 result = specSize; 15150 break; 15151 } 15152 return result | (childMeasuredState&MEASURED_STATE_MASK); 15153 } 15154 15155 /** 15156 * Utility to return a default size. Uses the supplied size if the 15157 * MeasureSpec imposed no constraints. Will get larger if allowed 15158 * by the MeasureSpec. 15159 * 15160 * @param size Default size for this view 15161 * @param measureSpec Constraints imposed by the parent 15162 * @return The size this view should be. 15163 */ 15164 public static int getDefaultSize(int size, int measureSpec) { 15165 int result = size; 15166 int specMode = MeasureSpec.getMode(measureSpec); 15167 int specSize = MeasureSpec.getSize(measureSpec); 15168 15169 switch (specMode) { 15170 case MeasureSpec.UNSPECIFIED: 15171 result = size; 15172 break; 15173 case MeasureSpec.AT_MOST: 15174 case MeasureSpec.EXACTLY: 15175 result = specSize; 15176 break; 15177 } 15178 return result; 15179 } 15180 15181 /** 15182 * Returns the suggested minimum height that the view should use. This 15183 * returns the maximum of the view's minimum height 15184 * and the background's minimum height 15185 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15186 * <p> 15187 * When being used in {@link #onMeasure(int, int)}, the caller should still 15188 * ensure the returned height is within the requirements of the parent. 15189 * 15190 * @return The suggested minimum height of the view. 15191 */ 15192 protected int getSuggestedMinimumHeight() { 15193 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15194 15195 } 15196 15197 /** 15198 * Returns the suggested minimum width that the view should use. This 15199 * returns the maximum of the view's minimum width) 15200 * and the background's minimum width 15201 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15202 * <p> 15203 * When being used in {@link #onMeasure(int, int)}, the caller should still 15204 * ensure the returned width is within the requirements of the parent. 15205 * 15206 * @return The suggested minimum width of the view. 15207 */ 15208 protected int getSuggestedMinimumWidth() { 15209 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15210 } 15211 15212 /** 15213 * Returns the minimum height of the view. 15214 * 15215 * @return the minimum height the view will try to be. 15216 * 15217 * @see #setMinimumHeight(int) 15218 * 15219 * @attr ref android.R.styleable#View_minHeight 15220 */ 15221 public int getMinimumHeight() { 15222 return mMinHeight; 15223 } 15224 15225 /** 15226 * Sets the minimum height of the view. It is not guaranteed the view will 15227 * be able to achieve this minimum height (for example, if its parent layout 15228 * constrains it with less available height). 15229 * 15230 * @param minHeight The minimum height the view will try to be. 15231 * 15232 * @see #getMinimumHeight() 15233 * 15234 * @attr ref android.R.styleable#View_minHeight 15235 */ 15236 public void setMinimumHeight(int minHeight) { 15237 mMinHeight = minHeight; 15238 requestLayout(); 15239 } 15240 15241 /** 15242 * Returns the minimum width of the view. 15243 * 15244 * @return the minimum width the view will try to be. 15245 * 15246 * @see #setMinimumWidth(int) 15247 * 15248 * @attr ref android.R.styleable#View_minWidth 15249 */ 15250 public int getMinimumWidth() { 15251 return mMinWidth; 15252 } 15253 15254 /** 15255 * Sets the minimum width of the view. It is not guaranteed the view will 15256 * be able to achieve this minimum width (for example, if its parent layout 15257 * constrains it with less available width). 15258 * 15259 * @param minWidth The minimum width the view will try to be. 15260 * 15261 * @see #getMinimumWidth() 15262 * 15263 * @attr ref android.R.styleable#View_minWidth 15264 */ 15265 public void setMinimumWidth(int minWidth) { 15266 mMinWidth = minWidth; 15267 requestLayout(); 15268 15269 } 15270 15271 /** 15272 * Get the animation currently associated with this view. 15273 * 15274 * @return The animation that is currently playing or 15275 * scheduled to play for this view. 15276 */ 15277 public Animation getAnimation() { 15278 return mCurrentAnimation; 15279 } 15280 15281 /** 15282 * Start the specified animation now. 15283 * 15284 * @param animation the animation to start now 15285 */ 15286 public void startAnimation(Animation animation) { 15287 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15288 setAnimation(animation); 15289 invalidateParentCaches(); 15290 invalidate(true); 15291 } 15292 15293 /** 15294 * Cancels any animations for this view. 15295 */ 15296 public void clearAnimation() { 15297 if (mCurrentAnimation != null) { 15298 mCurrentAnimation.detach(); 15299 } 15300 mCurrentAnimation = null; 15301 invalidateParentIfNeeded(); 15302 } 15303 15304 /** 15305 * Sets the next animation to play for this view. 15306 * If you want the animation to play immediately, use 15307 * {@link #startAnimation(android.view.animation.Animation)} instead. 15308 * This method provides allows fine-grained 15309 * control over the start time and invalidation, but you 15310 * must make sure that 1) the animation has a start time set, and 15311 * 2) the view's parent (which controls animations on its children) 15312 * will be invalidated when the animation is supposed to 15313 * start. 15314 * 15315 * @param animation The next animation, or null. 15316 */ 15317 public void setAnimation(Animation animation) { 15318 mCurrentAnimation = animation; 15319 15320 if (animation != null) { 15321 // If the screen is off assume the animation start time is now instead of 15322 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15323 // would cause the animation to start when the screen turns back on 15324 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15325 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15326 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15327 } 15328 animation.reset(); 15329 } 15330 } 15331 15332 /** 15333 * Invoked by a parent ViewGroup to notify the start of the animation 15334 * currently associated with this view. If you override this method, 15335 * always call super.onAnimationStart(); 15336 * 15337 * @see #setAnimation(android.view.animation.Animation) 15338 * @see #getAnimation() 15339 */ 15340 protected void onAnimationStart() { 15341 mPrivateFlags |= ANIMATION_STARTED; 15342 } 15343 15344 /** 15345 * Invoked by a parent ViewGroup to notify the end of the animation 15346 * currently associated with this view. If you override this method, 15347 * always call super.onAnimationEnd(); 15348 * 15349 * @see #setAnimation(android.view.animation.Animation) 15350 * @see #getAnimation() 15351 */ 15352 protected void onAnimationEnd() { 15353 mPrivateFlags &= ~ANIMATION_STARTED; 15354 } 15355 15356 /** 15357 * Invoked if there is a Transform that involves alpha. Subclass that can 15358 * draw themselves with the specified alpha should return true, and then 15359 * respect that alpha when their onDraw() is called. If this returns false 15360 * then the view may be redirected to draw into an offscreen buffer to 15361 * fulfill the request, which will look fine, but may be slower than if the 15362 * subclass handles it internally. The default implementation returns false. 15363 * 15364 * @param alpha The alpha (0..255) to apply to the view's drawing 15365 * @return true if the view can draw with the specified alpha. 15366 */ 15367 protected boolean onSetAlpha(int alpha) { 15368 return false; 15369 } 15370 15371 /** 15372 * This is used by the RootView to perform an optimization when 15373 * the view hierarchy contains one or several SurfaceView. 15374 * SurfaceView is always considered transparent, but its children are not, 15375 * therefore all View objects remove themselves from the global transparent 15376 * region (passed as a parameter to this function). 15377 * 15378 * @param region The transparent region for this ViewAncestor (window). 15379 * 15380 * @return Returns true if the effective visibility of the view at this 15381 * point is opaque, regardless of the transparent region; returns false 15382 * if it is possible for underlying windows to be seen behind the view. 15383 * 15384 * {@hide} 15385 */ 15386 public boolean gatherTransparentRegion(Region region) { 15387 final AttachInfo attachInfo = mAttachInfo; 15388 if (region != null && attachInfo != null) { 15389 final int pflags = mPrivateFlags; 15390 if ((pflags & SKIP_DRAW) == 0) { 15391 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15392 // remove it from the transparent region. 15393 final int[] location = attachInfo.mTransparentLocation; 15394 getLocationInWindow(location); 15395 region.op(location[0], location[1], location[0] + mRight - mLeft, 15396 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15397 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15398 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15399 // exists, so we remove the background drawable's non-transparent 15400 // parts from this transparent region. 15401 applyDrawableToTransparentRegion(mBackground, region); 15402 } 15403 } 15404 return true; 15405 } 15406 15407 /** 15408 * Play a sound effect for this view. 15409 * 15410 * <p>The framework will play sound effects for some built in actions, such as 15411 * clicking, but you may wish to play these effects in your widget, 15412 * for instance, for internal navigation. 15413 * 15414 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15415 * {@link #isSoundEffectsEnabled()} is true. 15416 * 15417 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15418 */ 15419 public void playSoundEffect(int soundConstant) { 15420 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15421 return; 15422 } 15423 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15424 } 15425 15426 /** 15427 * BZZZTT!!1! 15428 * 15429 * <p>Provide haptic feedback to the user for this view. 15430 * 15431 * <p>The framework will provide haptic feedback for some built in actions, 15432 * such as long presses, but you may wish to provide feedback for your 15433 * own widget. 15434 * 15435 * <p>The feedback will only be performed if 15436 * {@link #isHapticFeedbackEnabled()} is true. 15437 * 15438 * @param feedbackConstant One of the constants defined in 15439 * {@link HapticFeedbackConstants} 15440 */ 15441 public boolean performHapticFeedback(int feedbackConstant) { 15442 return performHapticFeedback(feedbackConstant, 0); 15443 } 15444 15445 /** 15446 * BZZZTT!!1! 15447 * 15448 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15449 * 15450 * @param feedbackConstant One of the constants defined in 15451 * {@link HapticFeedbackConstants} 15452 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15453 */ 15454 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15455 if (mAttachInfo == null) { 15456 return false; 15457 } 15458 //noinspection SimplifiableIfStatement 15459 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15460 && !isHapticFeedbackEnabled()) { 15461 return false; 15462 } 15463 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15464 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15465 } 15466 15467 /** 15468 * Request that the visibility of the status bar or other screen/window 15469 * decorations be changed. 15470 * 15471 * <p>This method is used to put the over device UI into temporary modes 15472 * where the user's attention is focused more on the application content, 15473 * by dimming or hiding surrounding system affordances. This is typically 15474 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15475 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15476 * to be placed behind the action bar (and with these flags other system 15477 * affordances) so that smooth transitions between hiding and showing them 15478 * can be done. 15479 * 15480 * <p>Two representative examples of the use of system UI visibility is 15481 * implementing a content browsing application (like a magazine reader) 15482 * and a video playing application. 15483 * 15484 * <p>The first code shows a typical implementation of a View in a content 15485 * browsing application. In this implementation, the application goes 15486 * into a content-oriented mode by hiding the status bar and action bar, 15487 * and putting the navigation elements into lights out mode. The user can 15488 * then interact with content while in this mode. Such an application should 15489 * provide an easy way for the user to toggle out of the mode (such as to 15490 * check information in the status bar or access notifications). In the 15491 * implementation here, this is done simply by tapping on the content. 15492 * 15493 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15494 * content} 15495 * 15496 * <p>This second code sample shows a typical implementation of a View 15497 * in a video playing application. In this situation, while the video is 15498 * playing the application would like to go into a complete full-screen mode, 15499 * to use as much of the display as possible for the video. When in this state 15500 * the user can not interact with the application; the system intercepts 15501 * touching on the screen to pop the UI out of full screen mode. See 15502 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15503 * 15504 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15505 * content} 15506 * 15507 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15508 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15509 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15510 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15511 */ 15512 public void setSystemUiVisibility(int visibility) { 15513 if (visibility != mSystemUiVisibility) { 15514 mSystemUiVisibility = visibility; 15515 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15516 mParent.recomputeViewAttributes(this); 15517 } 15518 } 15519 } 15520 15521 /** 15522 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15523 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15524 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15525 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15526 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15527 */ 15528 public int getSystemUiVisibility() { 15529 return mSystemUiVisibility; 15530 } 15531 15532 /** 15533 * Returns the current system UI visibility that is currently set for 15534 * the entire window. This is the combination of the 15535 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15536 * views in the window. 15537 */ 15538 public int getWindowSystemUiVisibility() { 15539 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15540 } 15541 15542 /** 15543 * Override to find out when the window's requested system UI visibility 15544 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15545 * This is different from the callbacks recieved through 15546 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15547 * in that this is only telling you about the local request of the window, 15548 * not the actual values applied by the system. 15549 */ 15550 public void onWindowSystemUiVisibilityChanged(int visible) { 15551 } 15552 15553 /** 15554 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15555 * the view hierarchy. 15556 */ 15557 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15558 onWindowSystemUiVisibilityChanged(visible); 15559 } 15560 15561 /** 15562 * Set a listener to receive callbacks when the visibility of the system bar changes. 15563 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15564 */ 15565 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15566 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15567 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15568 mParent.recomputeViewAttributes(this); 15569 } 15570 } 15571 15572 /** 15573 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15574 * the view hierarchy. 15575 */ 15576 public void dispatchSystemUiVisibilityChanged(int visibility) { 15577 ListenerInfo li = mListenerInfo; 15578 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15579 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15580 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15581 } 15582 } 15583 15584 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15585 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15586 if (val != mSystemUiVisibility) { 15587 setSystemUiVisibility(val); 15588 return true; 15589 } 15590 return false; 15591 } 15592 15593 /** @hide */ 15594 public void setDisabledSystemUiVisibility(int flags) { 15595 if (mAttachInfo != null) { 15596 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15597 mAttachInfo.mDisabledSystemUiVisibility = flags; 15598 if (mParent != null) { 15599 mParent.recomputeViewAttributes(this); 15600 } 15601 } 15602 } 15603 } 15604 15605 /** 15606 * Creates an image that the system displays during the drag and drop 15607 * operation. This is called a "drag shadow". The default implementation 15608 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15609 * appearance as the given View. The default also positions the center of the drag shadow 15610 * directly under the touch point. If no View is provided (the constructor with no parameters 15611 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15612 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15613 * default is an invisible drag shadow. 15614 * <p> 15615 * You are not required to use the View you provide to the constructor as the basis of the 15616 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15617 * anything you want as the drag shadow. 15618 * </p> 15619 * <p> 15620 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15621 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15622 * size and position of the drag shadow. It uses this data to construct a 15623 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15624 * so that your application can draw the shadow image in the Canvas. 15625 * </p> 15626 * 15627 * <div class="special reference"> 15628 * <h3>Developer Guides</h3> 15629 * <p>For a guide to implementing drag and drop features, read the 15630 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15631 * </div> 15632 */ 15633 public static class DragShadowBuilder { 15634 private final WeakReference<View> mView; 15635 15636 /** 15637 * Constructs a shadow image builder based on a View. By default, the resulting drag 15638 * shadow will have the same appearance and dimensions as the View, with the touch point 15639 * over the center of the View. 15640 * @param view A View. Any View in scope can be used. 15641 */ 15642 public DragShadowBuilder(View view) { 15643 mView = new WeakReference<View>(view); 15644 } 15645 15646 /** 15647 * Construct a shadow builder object with no associated View. This 15648 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15649 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15650 * to supply the drag shadow's dimensions and appearance without 15651 * reference to any View object. If they are not overridden, then the result is an 15652 * invisible drag shadow. 15653 */ 15654 public DragShadowBuilder() { 15655 mView = new WeakReference<View>(null); 15656 } 15657 15658 /** 15659 * Returns the View object that had been passed to the 15660 * {@link #View.DragShadowBuilder(View)} 15661 * constructor. If that View parameter was {@code null} or if the 15662 * {@link #View.DragShadowBuilder()} 15663 * constructor was used to instantiate the builder object, this method will return 15664 * null. 15665 * 15666 * @return The View object associate with this builder object. 15667 */ 15668 @SuppressWarnings({"JavadocReference"}) 15669 final public View getView() { 15670 return mView.get(); 15671 } 15672 15673 /** 15674 * Provides the metrics for the shadow image. These include the dimensions of 15675 * the shadow image, and the point within that shadow that should 15676 * be centered under the touch location while dragging. 15677 * <p> 15678 * The default implementation sets the dimensions of the shadow to be the 15679 * same as the dimensions of the View itself and centers the shadow under 15680 * the touch point. 15681 * </p> 15682 * 15683 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15684 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15685 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15686 * image. 15687 * 15688 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15689 * shadow image that should be underneath the touch point during the drag and drop 15690 * operation. Your application must set {@link android.graphics.Point#x} to the 15691 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15692 */ 15693 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15694 final View view = mView.get(); 15695 if (view != null) { 15696 shadowSize.set(view.getWidth(), view.getHeight()); 15697 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15698 } else { 15699 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15700 } 15701 } 15702 15703 /** 15704 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15705 * based on the dimensions it received from the 15706 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15707 * 15708 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15709 */ 15710 public void onDrawShadow(Canvas canvas) { 15711 final View view = mView.get(); 15712 if (view != null) { 15713 view.draw(canvas); 15714 } else { 15715 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15716 } 15717 } 15718 } 15719 15720 /** 15721 * Starts a drag and drop operation. When your application calls this method, it passes a 15722 * {@link android.view.View.DragShadowBuilder} object to the system. The 15723 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15724 * to get metrics for the drag shadow, and then calls the object's 15725 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15726 * <p> 15727 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15728 * drag events to all the View objects in your application that are currently visible. It does 15729 * this either by calling the View object's drag listener (an implementation of 15730 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15731 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15732 * Both are passed a {@link android.view.DragEvent} object that has a 15733 * {@link android.view.DragEvent#getAction()} value of 15734 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15735 * </p> 15736 * <p> 15737 * Your application can invoke startDrag() on any attached View object. The View object does not 15738 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15739 * be related to the View the user selected for dragging. 15740 * </p> 15741 * @param data A {@link android.content.ClipData} object pointing to the data to be 15742 * transferred by the drag and drop operation. 15743 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15744 * drag shadow. 15745 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15746 * drop operation. This Object is put into every DragEvent object sent by the system during the 15747 * current drag. 15748 * <p> 15749 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15750 * to the target Views. For example, it can contain flags that differentiate between a 15751 * a copy operation and a move operation. 15752 * </p> 15753 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15754 * so the parameter should be set to 0. 15755 * @return {@code true} if the method completes successfully, or 15756 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15757 * do a drag, and so no drag operation is in progress. 15758 */ 15759 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15760 Object myLocalState, int flags) { 15761 if (ViewDebug.DEBUG_DRAG) { 15762 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15763 } 15764 boolean okay = false; 15765 15766 Point shadowSize = new Point(); 15767 Point shadowTouchPoint = new Point(); 15768 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15769 15770 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15771 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15772 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15773 } 15774 15775 if (ViewDebug.DEBUG_DRAG) { 15776 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15777 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15778 } 15779 Surface surface = new Surface(); 15780 try { 15781 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15782 flags, shadowSize.x, shadowSize.y, surface); 15783 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15784 + " surface=" + surface); 15785 if (token != null) { 15786 Canvas canvas = surface.lockCanvas(null); 15787 try { 15788 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15789 shadowBuilder.onDrawShadow(canvas); 15790 } finally { 15791 surface.unlockCanvasAndPost(canvas); 15792 } 15793 15794 final ViewRootImpl root = getViewRootImpl(); 15795 15796 // Cache the local state object for delivery with DragEvents 15797 root.setLocalDragState(myLocalState); 15798 15799 // repurpose 'shadowSize' for the last touch point 15800 root.getLastTouchPoint(shadowSize); 15801 15802 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15803 shadowSize.x, shadowSize.y, 15804 shadowTouchPoint.x, shadowTouchPoint.y, data); 15805 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15806 15807 // Off and running! Release our local surface instance; the drag 15808 // shadow surface is now managed by the system process. 15809 surface.release(); 15810 } 15811 } catch (Exception e) { 15812 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15813 surface.destroy(); 15814 } 15815 15816 return okay; 15817 } 15818 15819 /** 15820 * Handles drag events sent by the system following a call to 15821 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15822 *<p> 15823 * When the system calls this method, it passes a 15824 * {@link android.view.DragEvent} object. A call to 15825 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15826 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15827 * operation. 15828 * @param event The {@link android.view.DragEvent} sent by the system. 15829 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15830 * in DragEvent, indicating the type of drag event represented by this object. 15831 * @return {@code true} if the method was successful, otherwise {@code false}. 15832 * <p> 15833 * The method should return {@code true} in response to an action type of 15834 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15835 * operation. 15836 * </p> 15837 * <p> 15838 * The method should also return {@code true} in response to an action type of 15839 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15840 * {@code false} if it didn't. 15841 * </p> 15842 */ 15843 public boolean onDragEvent(DragEvent event) { 15844 return false; 15845 } 15846 15847 /** 15848 * Detects if this View is enabled and has a drag event listener. 15849 * If both are true, then it calls the drag event listener with the 15850 * {@link android.view.DragEvent} it received. If the drag event listener returns 15851 * {@code true}, then dispatchDragEvent() returns {@code true}. 15852 * <p> 15853 * For all other cases, the method calls the 15854 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15855 * method and returns its result. 15856 * </p> 15857 * <p> 15858 * This ensures that a drag event is always consumed, even if the View does not have a drag 15859 * event listener. However, if the View has a listener and the listener returns true, then 15860 * onDragEvent() is not called. 15861 * </p> 15862 */ 15863 public boolean dispatchDragEvent(DragEvent event) { 15864 //noinspection SimplifiableIfStatement 15865 ListenerInfo li = mListenerInfo; 15866 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15867 && li.mOnDragListener.onDrag(this, event)) { 15868 return true; 15869 } 15870 return onDragEvent(event); 15871 } 15872 15873 boolean canAcceptDrag() { 15874 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15875 } 15876 15877 /** 15878 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15879 * it is ever exposed at all. 15880 * @hide 15881 */ 15882 public void onCloseSystemDialogs(String reason) { 15883 } 15884 15885 /** 15886 * Given a Drawable whose bounds have been set to draw into this view, 15887 * update a Region being computed for 15888 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15889 * that any non-transparent parts of the Drawable are removed from the 15890 * given transparent region. 15891 * 15892 * @param dr The Drawable whose transparency is to be applied to the region. 15893 * @param region A Region holding the current transparency information, 15894 * where any parts of the region that are set are considered to be 15895 * transparent. On return, this region will be modified to have the 15896 * transparency information reduced by the corresponding parts of the 15897 * Drawable that are not transparent. 15898 * {@hide} 15899 */ 15900 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15901 if (DBG) { 15902 Log.i("View", "Getting transparent region for: " + this); 15903 } 15904 final Region r = dr.getTransparentRegion(); 15905 final Rect db = dr.getBounds(); 15906 final AttachInfo attachInfo = mAttachInfo; 15907 if (r != null && attachInfo != null) { 15908 final int w = getRight()-getLeft(); 15909 final int h = getBottom()-getTop(); 15910 if (db.left > 0) { 15911 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15912 r.op(0, 0, db.left, h, Region.Op.UNION); 15913 } 15914 if (db.right < w) { 15915 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15916 r.op(db.right, 0, w, h, Region.Op.UNION); 15917 } 15918 if (db.top > 0) { 15919 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15920 r.op(0, 0, w, db.top, Region.Op.UNION); 15921 } 15922 if (db.bottom < h) { 15923 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15924 r.op(0, db.bottom, w, h, Region.Op.UNION); 15925 } 15926 final int[] location = attachInfo.mTransparentLocation; 15927 getLocationInWindow(location); 15928 r.translate(location[0], location[1]); 15929 region.op(r, Region.Op.INTERSECT); 15930 } else { 15931 region.op(db, Region.Op.DIFFERENCE); 15932 } 15933 } 15934 15935 private void checkForLongClick(int delayOffset) { 15936 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15937 mHasPerformedLongPress = false; 15938 15939 if (mPendingCheckForLongPress == null) { 15940 mPendingCheckForLongPress = new CheckForLongPress(); 15941 } 15942 mPendingCheckForLongPress.rememberWindowAttachCount(); 15943 postDelayed(mPendingCheckForLongPress, 15944 ViewConfiguration.getLongPressTimeout() - delayOffset); 15945 } 15946 } 15947 15948 /** 15949 * Inflate a view from an XML resource. This convenience method wraps the {@link 15950 * LayoutInflater} class, which provides a full range of options for view inflation. 15951 * 15952 * @param context The Context object for your activity or application. 15953 * @param resource The resource ID to inflate 15954 * @param root A view group that will be the parent. Used to properly inflate the 15955 * layout_* parameters. 15956 * @see LayoutInflater 15957 */ 15958 public static View inflate(Context context, int resource, ViewGroup root) { 15959 LayoutInflater factory = LayoutInflater.from(context); 15960 return factory.inflate(resource, root); 15961 } 15962 15963 /** 15964 * Scroll the view with standard behavior for scrolling beyond the normal 15965 * content boundaries. Views that call this method should override 15966 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15967 * results of an over-scroll operation. 15968 * 15969 * Views can use this method to handle any touch or fling-based scrolling. 15970 * 15971 * @param deltaX Change in X in pixels 15972 * @param deltaY Change in Y in pixels 15973 * @param scrollX Current X scroll value in pixels before applying deltaX 15974 * @param scrollY Current Y scroll value in pixels before applying deltaY 15975 * @param scrollRangeX Maximum content scroll range along the X axis 15976 * @param scrollRangeY Maximum content scroll range along the Y axis 15977 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15978 * along the X axis. 15979 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15980 * along the Y axis. 15981 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15982 * @return true if scrolling was clamped to an over-scroll boundary along either 15983 * axis, false otherwise. 15984 */ 15985 @SuppressWarnings({"UnusedParameters"}) 15986 protected boolean overScrollBy(int deltaX, int deltaY, 15987 int scrollX, int scrollY, 15988 int scrollRangeX, int scrollRangeY, 15989 int maxOverScrollX, int maxOverScrollY, 15990 boolean isTouchEvent) { 15991 final int overScrollMode = mOverScrollMode; 15992 final boolean canScrollHorizontal = 15993 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15994 final boolean canScrollVertical = 15995 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15996 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15997 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15998 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15999 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 16000 16001 int newScrollX = scrollX + deltaX; 16002 if (!overScrollHorizontal) { 16003 maxOverScrollX = 0; 16004 } 16005 16006 int newScrollY = scrollY + deltaY; 16007 if (!overScrollVertical) { 16008 maxOverScrollY = 0; 16009 } 16010 16011 // Clamp values if at the limits and record 16012 final int left = -maxOverScrollX; 16013 final int right = maxOverScrollX + scrollRangeX; 16014 final int top = -maxOverScrollY; 16015 final int bottom = maxOverScrollY + scrollRangeY; 16016 16017 boolean clampedX = false; 16018 if (newScrollX > right) { 16019 newScrollX = right; 16020 clampedX = true; 16021 } else if (newScrollX < left) { 16022 newScrollX = left; 16023 clampedX = true; 16024 } 16025 16026 boolean clampedY = false; 16027 if (newScrollY > bottom) { 16028 newScrollY = bottom; 16029 clampedY = true; 16030 } else if (newScrollY < top) { 16031 newScrollY = top; 16032 clampedY = true; 16033 } 16034 16035 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16036 16037 return clampedX || clampedY; 16038 } 16039 16040 /** 16041 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16042 * respond to the results of an over-scroll operation. 16043 * 16044 * @param scrollX New X scroll value in pixels 16045 * @param scrollY New Y scroll value in pixels 16046 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16047 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16048 */ 16049 protected void onOverScrolled(int scrollX, int scrollY, 16050 boolean clampedX, boolean clampedY) { 16051 // Intentionally empty. 16052 } 16053 16054 /** 16055 * Returns the over-scroll mode for this view. The result will be 16056 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16057 * (allow over-scrolling only if the view content is larger than the container), 16058 * or {@link #OVER_SCROLL_NEVER}. 16059 * 16060 * @return This view's over-scroll mode. 16061 */ 16062 public int getOverScrollMode() { 16063 return mOverScrollMode; 16064 } 16065 16066 /** 16067 * Set the over-scroll mode for this view. Valid over-scroll modes are 16068 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16069 * (allow over-scrolling only if the view content is larger than the container), 16070 * or {@link #OVER_SCROLL_NEVER}. 16071 * 16072 * Setting the over-scroll mode of a view will have an effect only if the 16073 * view is capable of scrolling. 16074 * 16075 * @param overScrollMode The new over-scroll mode for this view. 16076 */ 16077 public void setOverScrollMode(int overScrollMode) { 16078 if (overScrollMode != OVER_SCROLL_ALWAYS && 16079 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16080 overScrollMode != OVER_SCROLL_NEVER) { 16081 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16082 } 16083 mOverScrollMode = overScrollMode; 16084 } 16085 16086 /** 16087 * Gets a scale factor that determines the distance the view should scroll 16088 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16089 * @return The vertical scroll scale factor. 16090 * @hide 16091 */ 16092 protected float getVerticalScrollFactor() { 16093 if (mVerticalScrollFactor == 0) { 16094 TypedValue outValue = new TypedValue(); 16095 if (!mContext.getTheme().resolveAttribute( 16096 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16097 throw new IllegalStateException( 16098 "Expected theme to define listPreferredItemHeight."); 16099 } 16100 mVerticalScrollFactor = outValue.getDimension( 16101 mContext.getResources().getDisplayMetrics()); 16102 } 16103 return mVerticalScrollFactor; 16104 } 16105 16106 /** 16107 * Gets a scale factor that determines the distance the view should scroll 16108 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16109 * @return The horizontal scroll scale factor. 16110 * @hide 16111 */ 16112 protected float getHorizontalScrollFactor() { 16113 // TODO: Should use something else. 16114 return getVerticalScrollFactor(); 16115 } 16116 16117 /** 16118 * Return the value specifying the text direction or policy that was set with 16119 * {@link #setTextDirection(int)}. 16120 * 16121 * @return the defined text direction. It can be one of: 16122 * 16123 * {@link #TEXT_DIRECTION_INHERIT}, 16124 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16125 * {@link #TEXT_DIRECTION_ANY_RTL}, 16126 * {@link #TEXT_DIRECTION_LTR}, 16127 * {@link #TEXT_DIRECTION_RTL}, 16128 * {@link #TEXT_DIRECTION_LOCALE} 16129 * @hide 16130 */ 16131 @ViewDebug.ExportedProperty(category = "text", mapping = { 16132 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16133 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16134 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16135 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16136 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16137 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16138 }) 16139 public int getTextDirection() { 16140 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16141 } 16142 16143 /** 16144 * Set the text direction. 16145 * 16146 * @param textDirection the direction to set. Should be one of: 16147 * 16148 * {@link #TEXT_DIRECTION_INHERIT}, 16149 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16150 * {@link #TEXT_DIRECTION_ANY_RTL}, 16151 * {@link #TEXT_DIRECTION_LTR}, 16152 * {@link #TEXT_DIRECTION_RTL}, 16153 * {@link #TEXT_DIRECTION_LOCALE} 16154 * @hide 16155 */ 16156 public void setTextDirection(int textDirection) { 16157 if (getTextDirection() != textDirection) { 16158 // Reset the current text direction and the resolved one 16159 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16160 resetResolvedTextDirection(); 16161 // Set the new text direction 16162 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16163 // Refresh 16164 requestLayout(); 16165 invalidate(true); 16166 } 16167 } 16168 16169 /** 16170 * Return the resolved text direction. 16171 * 16172 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16173 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16174 * up the parent chain of the view. if there is no parent, then it will return the default 16175 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16176 * 16177 * @return the resolved text direction. Returns one of: 16178 * 16179 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16180 * {@link #TEXT_DIRECTION_ANY_RTL}, 16181 * {@link #TEXT_DIRECTION_LTR}, 16182 * {@link #TEXT_DIRECTION_RTL}, 16183 * {@link #TEXT_DIRECTION_LOCALE} 16184 * @hide 16185 */ 16186 public int getResolvedTextDirection() { 16187 // The text direction will be resolved only if needed 16188 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16189 resolveTextDirection(); 16190 } 16191 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16192 } 16193 16194 /** 16195 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16196 * resolution is done. 16197 * @hide 16198 */ 16199 public void resolveTextDirection() { 16200 // Reset any previous text direction resolution 16201 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16202 16203 if (hasRtlSupport()) { 16204 // Set resolved text direction flag depending on text direction flag 16205 final int textDirection = getTextDirection(); 16206 switch(textDirection) { 16207 case TEXT_DIRECTION_INHERIT: 16208 if (canResolveTextDirection()) { 16209 ViewGroup viewGroup = ((ViewGroup) mParent); 16210 16211 // Set current resolved direction to the same value as the parent's one 16212 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16213 switch (parentResolvedDirection) { 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 mPrivateFlags2 |= 16220 (parentResolvedDirection << 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 // We cannot do the resolution if there is no parent, so use the default one 16228 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16229 } 16230 break; 16231 case TEXT_DIRECTION_FIRST_STRONG: 16232 case TEXT_DIRECTION_ANY_RTL: 16233 case TEXT_DIRECTION_LTR: 16234 case TEXT_DIRECTION_RTL: 16235 case TEXT_DIRECTION_LOCALE: 16236 // Resolved direction is the same as text direction 16237 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16238 break; 16239 default: 16240 // Default resolved direction is "first strong" heuristic 16241 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16242 } 16243 } else { 16244 // Default resolved direction is "first strong" heuristic 16245 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16246 } 16247 16248 // Set to resolved 16249 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16250 onResolvedTextDirectionChanged(); 16251 } 16252 16253 /** 16254 * Called when text direction has been resolved. Subclasses that care about text direction 16255 * resolution should override this method. 16256 * 16257 * The default implementation does nothing. 16258 * @hide 16259 */ 16260 public void onResolvedTextDirectionChanged() { 16261 } 16262 16263 /** 16264 * Check if text direction resolution can be done. 16265 * 16266 * @return true if text direction resolution can be done otherwise return false. 16267 * @hide 16268 */ 16269 public boolean canResolveTextDirection() { 16270 switch (getTextDirection()) { 16271 case TEXT_DIRECTION_INHERIT: 16272 return (mParent != null) && (mParent instanceof ViewGroup); 16273 default: 16274 return true; 16275 } 16276 } 16277 16278 /** 16279 * Reset resolved text direction. Text direction can be resolved with a call to 16280 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16281 * reset is done. 16282 * @hide 16283 */ 16284 public void resetResolvedTextDirection() { 16285 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16286 onResolvedTextDirectionReset(); 16287 } 16288 16289 /** 16290 * Called when text direction is reset. Subclasses that care about text direction reset should 16291 * override this method and do a reset of the text direction of their children. The default 16292 * implementation does nothing. 16293 * @hide 16294 */ 16295 public void onResolvedTextDirectionReset() { 16296 } 16297 16298 /** 16299 * Return the value specifying the text alignment or policy that was set with 16300 * {@link #setTextAlignment(int)}. 16301 * 16302 * @return the defined text alignment. It can be one of: 16303 * 16304 * {@link #TEXT_ALIGNMENT_INHERIT}, 16305 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16306 * {@link #TEXT_ALIGNMENT_CENTER}, 16307 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16308 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16309 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16310 * {@link #TEXT_ALIGNMENT_VIEW_END} 16311 * @hide 16312 */ 16313 @ViewDebug.ExportedProperty(category = "text", mapping = { 16314 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16315 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16316 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16317 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16318 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16319 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16320 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16321 }) 16322 public int getTextAlignment() { 16323 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16324 } 16325 16326 /** 16327 * Set the text alignment. 16328 * 16329 * @param textAlignment The text alignment to set. Should be one of 16330 * 16331 * {@link #TEXT_ALIGNMENT_INHERIT}, 16332 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16333 * {@link #TEXT_ALIGNMENT_CENTER}, 16334 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16335 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16336 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16337 * {@link #TEXT_ALIGNMENT_VIEW_END} 16338 * 16339 * @attr ref android.R.styleable#View_textAlignment 16340 * @hide 16341 */ 16342 public void setTextAlignment(int textAlignment) { 16343 if (textAlignment != getTextAlignment()) { 16344 // Reset the current and resolved text alignment 16345 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16346 resetResolvedTextAlignment(); 16347 // Set the new text alignment 16348 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16349 // Refresh 16350 requestLayout(); 16351 invalidate(true); 16352 } 16353 } 16354 16355 /** 16356 * Return the resolved text alignment. 16357 * 16358 * The resolved text alignment. This needs resolution if the value is 16359 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16360 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16361 * 16362 * @return the resolved text alignment. Returns one of: 16363 * 16364 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16365 * {@link #TEXT_ALIGNMENT_CENTER}, 16366 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16367 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16368 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16369 * {@link #TEXT_ALIGNMENT_VIEW_END} 16370 * @hide 16371 */ 16372 @ViewDebug.ExportedProperty(category = "text", mapping = { 16373 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16374 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16375 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16376 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16377 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16378 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16379 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16380 }) 16381 public int getResolvedTextAlignment() { 16382 // If text alignment is not resolved, then resolve it 16383 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16384 resolveTextAlignment(); 16385 } 16386 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16387 } 16388 16389 /** 16390 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16391 * resolution is done. 16392 * @hide 16393 */ 16394 public void resolveTextAlignment() { 16395 // Reset any previous text alignment resolution 16396 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16397 16398 if (hasRtlSupport()) { 16399 // Set resolved text alignment flag depending on text alignment flag 16400 final int textAlignment = getTextAlignment(); 16401 switch (textAlignment) { 16402 case TEXT_ALIGNMENT_INHERIT: 16403 // Check if we can resolve the text alignment 16404 if (canResolveLayoutDirection() && mParent instanceof View) { 16405 View view = (View) mParent; 16406 16407 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16408 switch (parentResolvedTextAlignment) { 16409 case TEXT_ALIGNMENT_GRAVITY: 16410 case TEXT_ALIGNMENT_TEXT_START: 16411 case TEXT_ALIGNMENT_TEXT_END: 16412 case TEXT_ALIGNMENT_CENTER: 16413 case TEXT_ALIGNMENT_VIEW_START: 16414 case TEXT_ALIGNMENT_VIEW_END: 16415 // Resolved text alignment is the same as the parent resolved 16416 // text alignment 16417 mPrivateFlags2 |= 16418 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16419 break; 16420 default: 16421 // Use default resolved text alignment 16422 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16423 } 16424 } 16425 else { 16426 // We cannot do the resolution if there is no parent so use the default 16427 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16428 } 16429 break; 16430 case TEXT_ALIGNMENT_GRAVITY: 16431 case TEXT_ALIGNMENT_TEXT_START: 16432 case TEXT_ALIGNMENT_TEXT_END: 16433 case TEXT_ALIGNMENT_CENTER: 16434 case TEXT_ALIGNMENT_VIEW_START: 16435 case TEXT_ALIGNMENT_VIEW_END: 16436 // Resolved text alignment is the same as text alignment 16437 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16438 break; 16439 default: 16440 // Use default resolved text alignment 16441 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16442 } 16443 } else { 16444 // Use default resolved text alignment 16445 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16446 } 16447 16448 // Set the resolved 16449 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16450 onResolvedTextAlignmentChanged(); 16451 } 16452 16453 /** 16454 * Check if text alignment resolution can be done. 16455 * 16456 * @return true if text alignment resolution can be done otherwise return false. 16457 * @hide 16458 */ 16459 public boolean canResolveTextAlignment() { 16460 switch (getTextAlignment()) { 16461 case TEXT_DIRECTION_INHERIT: 16462 return (mParent != null); 16463 default: 16464 return true; 16465 } 16466 } 16467 16468 /** 16469 * Called when text alignment has been resolved. Subclasses that care about text alignment 16470 * resolution should override this method. 16471 * 16472 * The default implementation does nothing. 16473 * @hide 16474 */ 16475 public void onResolvedTextAlignmentChanged() { 16476 } 16477 16478 /** 16479 * Reset resolved text alignment. Text alignment can be resolved with a call to 16480 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16481 * reset is done. 16482 * @hide 16483 */ 16484 public void resetResolvedTextAlignment() { 16485 // Reset any previous text alignment resolution 16486 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16487 onResolvedTextAlignmentReset(); 16488 } 16489 16490 /** 16491 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16492 * override this method and do a reset of the text alignment of their children. The default 16493 * implementation does nothing. 16494 * @hide 16495 */ 16496 public void onResolvedTextAlignmentReset() { 16497 } 16498 16499 // 16500 // Properties 16501 // 16502 /** 16503 * A Property wrapper around the <code>alpha</code> functionality handled by the 16504 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16505 */ 16506 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16507 @Override 16508 public void setValue(View object, float value) { 16509 object.setAlpha(value); 16510 } 16511 16512 @Override 16513 public Float get(View object) { 16514 return object.getAlpha(); 16515 } 16516 }; 16517 16518 /** 16519 * A Property wrapper around the <code>translationX</code> functionality handled by the 16520 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16521 */ 16522 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16523 @Override 16524 public void setValue(View object, float value) { 16525 object.setTranslationX(value); 16526 } 16527 16528 @Override 16529 public Float get(View object) { 16530 return object.getTranslationX(); 16531 } 16532 }; 16533 16534 /** 16535 * A Property wrapper around the <code>translationY</code> functionality handled by the 16536 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16537 */ 16538 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16539 @Override 16540 public void setValue(View object, float value) { 16541 object.setTranslationY(value); 16542 } 16543 16544 @Override 16545 public Float get(View object) { 16546 return object.getTranslationY(); 16547 } 16548 }; 16549 16550 /** 16551 * A Property wrapper around the <code>x</code> functionality handled by the 16552 * {@link View#setX(float)} and {@link View#getX()} methods. 16553 */ 16554 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16555 @Override 16556 public void setValue(View object, float value) { 16557 object.setX(value); 16558 } 16559 16560 @Override 16561 public Float get(View object) { 16562 return object.getX(); 16563 } 16564 }; 16565 16566 /** 16567 * A Property wrapper around the <code>y</code> functionality handled by the 16568 * {@link View#setY(float)} and {@link View#getY()} methods. 16569 */ 16570 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16571 @Override 16572 public void setValue(View object, float value) { 16573 object.setY(value); 16574 } 16575 16576 @Override 16577 public Float get(View object) { 16578 return object.getY(); 16579 } 16580 }; 16581 16582 /** 16583 * A Property wrapper around the <code>rotation</code> functionality handled by the 16584 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16585 */ 16586 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16587 @Override 16588 public void setValue(View object, float value) { 16589 object.setRotation(value); 16590 } 16591 16592 @Override 16593 public Float get(View object) { 16594 return object.getRotation(); 16595 } 16596 }; 16597 16598 /** 16599 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16600 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16601 */ 16602 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16603 @Override 16604 public void setValue(View object, float value) { 16605 object.setRotationX(value); 16606 } 16607 16608 @Override 16609 public Float get(View object) { 16610 return object.getRotationX(); 16611 } 16612 }; 16613 16614 /** 16615 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16616 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16617 */ 16618 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16619 @Override 16620 public void setValue(View object, float value) { 16621 object.setRotationY(value); 16622 } 16623 16624 @Override 16625 public Float get(View object) { 16626 return object.getRotationY(); 16627 } 16628 }; 16629 16630 /** 16631 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16632 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16633 */ 16634 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16635 @Override 16636 public void setValue(View object, float value) { 16637 object.setScaleX(value); 16638 } 16639 16640 @Override 16641 public Float get(View object) { 16642 return object.getScaleX(); 16643 } 16644 }; 16645 16646 /** 16647 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16648 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16649 */ 16650 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16651 @Override 16652 public void setValue(View object, float value) { 16653 object.setScaleY(value); 16654 } 16655 16656 @Override 16657 public Float get(View object) { 16658 return object.getScaleY(); 16659 } 16660 }; 16661 16662 /** 16663 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16664 * Each MeasureSpec represents a requirement for either the width or the height. 16665 * A MeasureSpec is comprised of a size and a mode. There are three possible 16666 * modes: 16667 * <dl> 16668 * <dt>UNSPECIFIED</dt> 16669 * <dd> 16670 * The parent has not imposed any constraint on the child. It can be whatever size 16671 * it wants. 16672 * </dd> 16673 * 16674 * <dt>EXACTLY</dt> 16675 * <dd> 16676 * The parent has determined an exact size for the child. The child is going to be 16677 * given those bounds regardless of how big it wants to be. 16678 * </dd> 16679 * 16680 * <dt>AT_MOST</dt> 16681 * <dd> 16682 * The child can be as large as it wants up to the specified size. 16683 * </dd> 16684 * </dl> 16685 * 16686 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16687 * is provided to pack and unpack the <size, mode> tuple into the int. 16688 */ 16689 public static class MeasureSpec { 16690 private static final int MODE_SHIFT = 30; 16691 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16692 16693 /** 16694 * Measure specification mode: The parent has not imposed any constraint 16695 * on the child. It can be whatever size it wants. 16696 */ 16697 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16698 16699 /** 16700 * Measure specification mode: The parent has determined an exact size 16701 * for the child. The child is going to be given those bounds regardless 16702 * of how big it wants to be. 16703 */ 16704 public static final int EXACTLY = 1 << MODE_SHIFT; 16705 16706 /** 16707 * Measure specification mode: The child can be as large as it wants up 16708 * to the specified size. 16709 */ 16710 public static final int AT_MOST = 2 << MODE_SHIFT; 16711 16712 /** 16713 * Creates a measure specification based on the supplied size and mode. 16714 * 16715 * The mode must always be one of the following: 16716 * <ul> 16717 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16718 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16719 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16720 * </ul> 16721 * 16722 * @param size the size of the measure specification 16723 * @param mode the mode of the measure specification 16724 * @return the measure specification based on size and mode 16725 */ 16726 public static int makeMeasureSpec(int size, int mode) { 16727 return size + mode; 16728 } 16729 16730 /** 16731 * Extracts the mode from the supplied measure specification. 16732 * 16733 * @param measureSpec the measure specification to extract the mode from 16734 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16735 * {@link android.view.View.MeasureSpec#AT_MOST} or 16736 * {@link android.view.View.MeasureSpec#EXACTLY} 16737 */ 16738 public static int getMode(int measureSpec) { 16739 return (measureSpec & MODE_MASK); 16740 } 16741 16742 /** 16743 * Extracts the size from the supplied measure specification. 16744 * 16745 * @param measureSpec the measure specification to extract the size from 16746 * @return the size in pixels defined in the supplied measure specification 16747 */ 16748 public static int getSize(int measureSpec) { 16749 return (measureSpec & ~MODE_MASK); 16750 } 16751 16752 /** 16753 * Returns a String representation of the specified measure 16754 * specification. 16755 * 16756 * @param measureSpec the measure specification to convert to a String 16757 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16758 */ 16759 public static String toString(int measureSpec) { 16760 int mode = getMode(measureSpec); 16761 int size = getSize(measureSpec); 16762 16763 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16764 16765 if (mode == UNSPECIFIED) 16766 sb.append("UNSPECIFIED "); 16767 else if (mode == EXACTLY) 16768 sb.append("EXACTLY "); 16769 else if (mode == AT_MOST) 16770 sb.append("AT_MOST "); 16771 else 16772 sb.append(mode).append(" "); 16773 16774 sb.append(size); 16775 return sb.toString(); 16776 } 16777 } 16778 16779 class CheckForLongPress implements Runnable { 16780 16781 private int mOriginalWindowAttachCount; 16782 16783 public void run() { 16784 if (isPressed() && (mParent != null) 16785 && mOriginalWindowAttachCount == mWindowAttachCount) { 16786 if (performLongClick()) { 16787 mHasPerformedLongPress = true; 16788 } 16789 } 16790 } 16791 16792 public void rememberWindowAttachCount() { 16793 mOriginalWindowAttachCount = mWindowAttachCount; 16794 } 16795 } 16796 16797 private final class CheckForTap implements Runnable { 16798 public void run() { 16799 mPrivateFlags &= ~PREPRESSED; 16800 setPressed(true); 16801 checkForLongClick(ViewConfiguration.getTapTimeout()); 16802 } 16803 } 16804 16805 private final class PerformClick implements Runnable { 16806 public void run() { 16807 performClick(); 16808 } 16809 } 16810 16811 /** @hide */ 16812 public void hackTurnOffWindowResizeAnim(boolean off) { 16813 mAttachInfo.mTurnOffWindowResizeAnim = off; 16814 } 16815 16816 /** 16817 * This method returns a ViewPropertyAnimator object, which can be used to animate 16818 * specific properties on this View. 16819 * 16820 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16821 */ 16822 public ViewPropertyAnimator animate() { 16823 if (mAnimator == null) { 16824 mAnimator = new ViewPropertyAnimator(this); 16825 } 16826 return mAnimator; 16827 } 16828 16829 /** 16830 * Interface definition for a callback to be invoked when a key event is 16831 * dispatched to this view. The callback will be invoked before the key 16832 * event is given to the view. 16833 */ 16834 public interface OnKeyListener { 16835 /** 16836 * Called when a key is dispatched to a view. This allows listeners to 16837 * get a chance to respond before the target view. 16838 * 16839 * @param v The view the key has been dispatched to. 16840 * @param keyCode The code for the physical key that was pressed 16841 * @param event The KeyEvent object containing full information about 16842 * the event. 16843 * @return True if the listener has consumed the event, false otherwise. 16844 */ 16845 boolean onKey(View v, int keyCode, KeyEvent event); 16846 } 16847 16848 /** 16849 * Interface definition for a callback to be invoked when a touch event is 16850 * dispatched to this view. The callback will be invoked before the touch 16851 * event is given to the view. 16852 */ 16853 public interface OnTouchListener { 16854 /** 16855 * Called when a touch event is dispatched to a view. This allows listeners to 16856 * get a chance to respond before the target view. 16857 * 16858 * @param v The view the touch event has been dispatched to. 16859 * @param event The MotionEvent object containing full information about 16860 * the event. 16861 * @return True if the listener has consumed the event, false otherwise. 16862 */ 16863 boolean onTouch(View v, MotionEvent event); 16864 } 16865 16866 /** 16867 * Interface definition for a callback to be invoked when a hover event is 16868 * dispatched to this view. The callback will be invoked before the hover 16869 * event is given to the view. 16870 */ 16871 public interface OnHoverListener { 16872 /** 16873 * Called when a hover event is dispatched to a view. This allows listeners to 16874 * get a chance to respond before the target view. 16875 * 16876 * @param v The view the hover event has been dispatched to. 16877 * @param event The MotionEvent object containing full information about 16878 * the event. 16879 * @return True if the listener has consumed the event, false otherwise. 16880 */ 16881 boolean onHover(View v, MotionEvent event); 16882 } 16883 16884 /** 16885 * Interface definition for a callback to be invoked when a generic motion event is 16886 * dispatched to this view. The callback will be invoked before the generic motion 16887 * event is given to the view. 16888 */ 16889 public interface OnGenericMotionListener { 16890 /** 16891 * Called when a generic motion event is dispatched to a view. This allows listeners to 16892 * get a chance to respond before the target view. 16893 * 16894 * @param v The view the generic motion event has been dispatched to. 16895 * @param event The MotionEvent object containing full information about 16896 * the event. 16897 * @return True if the listener has consumed the event, false otherwise. 16898 */ 16899 boolean onGenericMotion(View v, MotionEvent event); 16900 } 16901 16902 /** 16903 * Interface definition for a callback to be invoked when a view has been clicked and held. 16904 */ 16905 public interface OnLongClickListener { 16906 /** 16907 * Called when a view has been clicked and held. 16908 * 16909 * @param v The view that was clicked and held. 16910 * 16911 * @return true if the callback consumed the long click, false otherwise. 16912 */ 16913 boolean onLongClick(View v); 16914 } 16915 16916 /** 16917 * Interface definition for a callback to be invoked when a drag is being dispatched 16918 * to this view. The callback will be invoked before the hosting view's own 16919 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16920 * onDrag(event) behavior, it should return 'false' from this callback. 16921 * 16922 * <div class="special reference"> 16923 * <h3>Developer Guides</h3> 16924 * <p>For a guide to implementing drag and drop features, read the 16925 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16926 * </div> 16927 */ 16928 public interface OnDragListener { 16929 /** 16930 * Called when a drag event is dispatched to a view. This allows listeners 16931 * to get a chance to override base View behavior. 16932 * 16933 * @param v The View that received the drag event. 16934 * @param event The {@link android.view.DragEvent} object for the drag event. 16935 * @return {@code true} if the drag event was handled successfully, or {@code false} 16936 * if the drag event was not handled. Note that {@code false} will trigger the View 16937 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16938 */ 16939 boolean onDrag(View v, DragEvent event); 16940 } 16941 16942 /** 16943 * Interface definition for a callback to be invoked when the focus state of 16944 * a view changed. 16945 */ 16946 public interface OnFocusChangeListener { 16947 /** 16948 * Called when the focus state of a view has changed. 16949 * 16950 * @param v The view whose state has changed. 16951 * @param hasFocus The new focus state of v. 16952 */ 16953 void onFocusChange(View v, boolean hasFocus); 16954 } 16955 16956 /** 16957 * Interface definition for a callback to be invoked when a view is clicked. 16958 */ 16959 public interface OnClickListener { 16960 /** 16961 * Called when a view has been clicked. 16962 * 16963 * @param v The view that was clicked. 16964 */ 16965 void onClick(View v); 16966 } 16967 16968 /** 16969 * Interface definition for a callback to be invoked when the context menu 16970 * for this view is being built. 16971 */ 16972 public interface OnCreateContextMenuListener { 16973 /** 16974 * Called when the context menu for this view is being built. It is not 16975 * safe to hold onto the menu after this method returns. 16976 * 16977 * @param menu The context menu that is being built 16978 * @param v The view for which the context menu is being built 16979 * @param menuInfo Extra information about the item for which the 16980 * context menu should be shown. This information will vary 16981 * depending on the class of v. 16982 */ 16983 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16984 } 16985 16986 /** 16987 * Interface definition for a callback to be invoked when the status bar changes 16988 * visibility. This reports <strong>global</strong> changes to the system UI 16989 * state, not what the application is requesting. 16990 * 16991 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16992 */ 16993 public interface OnSystemUiVisibilityChangeListener { 16994 /** 16995 * Called when the status bar changes visibility because of a call to 16996 * {@link View#setSystemUiVisibility(int)}. 16997 * 16998 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16999 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 17000 * This tells you the <strong>global</strong> state of these UI visibility 17001 * flags, not what your app is currently applying. 17002 */ 17003 public void onSystemUiVisibilityChange(int visibility); 17004 } 17005 17006 /** 17007 * Interface definition for a callback to be invoked when this view is attached 17008 * or detached from its window. 17009 */ 17010 public interface OnAttachStateChangeListener { 17011 /** 17012 * Called when the view is attached to a window. 17013 * @param v The view that was attached 17014 */ 17015 public void onViewAttachedToWindow(View v); 17016 /** 17017 * Called when the view is detached from a window. 17018 * @param v The view that was detached 17019 */ 17020 public void onViewDetachedFromWindow(View v); 17021 } 17022 17023 private final class UnsetPressedState implements Runnable { 17024 public void run() { 17025 setPressed(false); 17026 } 17027 } 17028 17029 /** 17030 * Base class for derived classes that want to save and restore their own 17031 * state in {@link android.view.View#onSaveInstanceState()}. 17032 */ 17033 public static class BaseSavedState extends AbsSavedState { 17034 /** 17035 * Constructor used when reading from a parcel. Reads the state of the superclass. 17036 * 17037 * @param source 17038 */ 17039 public BaseSavedState(Parcel source) { 17040 super(source); 17041 } 17042 17043 /** 17044 * Constructor called by derived classes when creating their SavedState objects 17045 * 17046 * @param superState The state of the superclass of this view 17047 */ 17048 public BaseSavedState(Parcelable superState) { 17049 super(superState); 17050 } 17051 17052 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17053 new Parcelable.Creator<BaseSavedState>() { 17054 public BaseSavedState createFromParcel(Parcel in) { 17055 return new BaseSavedState(in); 17056 } 17057 17058 public BaseSavedState[] newArray(int size) { 17059 return new BaseSavedState[size]; 17060 } 17061 }; 17062 } 17063 17064 /** 17065 * A set of information given to a view when it is attached to its parent 17066 * window. 17067 */ 17068 static class AttachInfo { 17069 interface Callbacks { 17070 void playSoundEffect(int effectId); 17071 boolean performHapticFeedback(int effectId, boolean always); 17072 } 17073 17074 /** 17075 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17076 * to a Handler. This class contains the target (View) to invalidate and 17077 * the coordinates of the dirty rectangle. 17078 * 17079 * For performance purposes, this class also implements a pool of up to 17080 * POOL_LIMIT objects that get reused. This reduces memory allocations 17081 * whenever possible. 17082 */ 17083 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17084 private static final int POOL_LIMIT = 10; 17085 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17086 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17087 public InvalidateInfo newInstance() { 17088 return new InvalidateInfo(); 17089 } 17090 17091 public void onAcquired(InvalidateInfo element) { 17092 } 17093 17094 public void onReleased(InvalidateInfo element) { 17095 element.target = null; 17096 } 17097 }, POOL_LIMIT) 17098 ); 17099 17100 private InvalidateInfo mNext; 17101 private boolean mIsPooled; 17102 17103 View target; 17104 17105 int left; 17106 int top; 17107 int right; 17108 int bottom; 17109 17110 public void setNextPoolable(InvalidateInfo element) { 17111 mNext = element; 17112 } 17113 17114 public InvalidateInfo getNextPoolable() { 17115 return mNext; 17116 } 17117 17118 static InvalidateInfo acquire() { 17119 return sPool.acquire(); 17120 } 17121 17122 void release() { 17123 sPool.release(this); 17124 } 17125 17126 public boolean isPooled() { 17127 return mIsPooled; 17128 } 17129 17130 public void setPooled(boolean isPooled) { 17131 mIsPooled = isPooled; 17132 } 17133 } 17134 17135 final IWindowSession mSession; 17136 17137 final IWindow mWindow; 17138 17139 final IBinder mWindowToken; 17140 17141 final Callbacks mRootCallbacks; 17142 17143 HardwareCanvas mHardwareCanvas; 17144 17145 /** 17146 * The top view of the hierarchy. 17147 */ 17148 View mRootView; 17149 17150 IBinder mPanelParentWindowToken; 17151 Surface mSurface; 17152 17153 boolean mHardwareAccelerated; 17154 boolean mHardwareAccelerationRequested; 17155 HardwareRenderer mHardwareRenderer; 17156 17157 boolean mScreenOn; 17158 17159 /** 17160 * Scale factor used by the compatibility mode 17161 */ 17162 float mApplicationScale; 17163 17164 /** 17165 * Indicates whether the application is in compatibility mode 17166 */ 17167 boolean mScalingRequired; 17168 17169 /** 17170 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17171 */ 17172 boolean mTurnOffWindowResizeAnim; 17173 17174 /** 17175 * Left position of this view's window 17176 */ 17177 int mWindowLeft; 17178 17179 /** 17180 * Top position of this view's window 17181 */ 17182 int mWindowTop; 17183 17184 /** 17185 * Indicates whether views need to use 32-bit drawing caches 17186 */ 17187 boolean mUse32BitDrawingCache; 17188 17189 /** 17190 * For windows that are full-screen but using insets to layout inside 17191 * of the screen decorations, these are the current insets for the 17192 * content of the window. 17193 */ 17194 final Rect mContentInsets = new Rect(); 17195 17196 /** 17197 * For windows that are full-screen but using insets to layout inside 17198 * of the screen decorations, these are the current insets for the 17199 * actual visible parts of the window. 17200 */ 17201 final Rect mVisibleInsets = new Rect(); 17202 17203 /** 17204 * The internal insets given by this window. This value is 17205 * supplied by the client (through 17206 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17207 * be given to the window manager when changed to be used in laying 17208 * out windows behind it. 17209 */ 17210 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17211 = new ViewTreeObserver.InternalInsetsInfo(); 17212 17213 /** 17214 * All views in the window's hierarchy that serve as scroll containers, 17215 * used to determine if the window can be resized or must be panned 17216 * to adjust for a soft input area. 17217 */ 17218 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17219 17220 final KeyEvent.DispatcherState mKeyDispatchState 17221 = new KeyEvent.DispatcherState(); 17222 17223 /** 17224 * Indicates whether the view's window currently has the focus. 17225 */ 17226 boolean mHasWindowFocus; 17227 17228 /** 17229 * The current visibility of the window. 17230 */ 17231 int mWindowVisibility; 17232 17233 /** 17234 * Indicates the time at which drawing started to occur. 17235 */ 17236 long mDrawingTime; 17237 17238 /** 17239 * Indicates whether or not ignoring the DIRTY_MASK flags. 17240 */ 17241 boolean mIgnoreDirtyState; 17242 17243 /** 17244 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17245 * to avoid clearing that flag prematurely. 17246 */ 17247 boolean mSetIgnoreDirtyState = false; 17248 17249 /** 17250 * Indicates whether the view's window is currently in touch mode. 17251 */ 17252 boolean mInTouchMode; 17253 17254 /** 17255 * Indicates that ViewAncestor should trigger a global layout change 17256 * the next time it performs a traversal 17257 */ 17258 boolean mRecomputeGlobalAttributes; 17259 17260 /** 17261 * Always report new attributes at next traversal. 17262 */ 17263 boolean mForceReportNewAttributes; 17264 17265 /** 17266 * Set during a traveral if any views want to keep the screen on. 17267 */ 17268 boolean mKeepScreenOn; 17269 17270 /** 17271 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17272 */ 17273 int mSystemUiVisibility; 17274 17275 /** 17276 * Hack to force certain system UI visibility flags to be cleared. 17277 */ 17278 int mDisabledSystemUiVisibility; 17279 17280 /** 17281 * Last global system UI visibility reported by the window manager. 17282 */ 17283 int mGlobalSystemUiVisibility; 17284 17285 /** 17286 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17287 * attached. 17288 */ 17289 boolean mHasSystemUiListeners; 17290 17291 /** 17292 * Set if the visibility of any views has changed. 17293 */ 17294 boolean mViewVisibilityChanged; 17295 17296 /** 17297 * Set to true if a view has been scrolled. 17298 */ 17299 boolean mViewScrollChanged; 17300 17301 /** 17302 * Global to the view hierarchy used as a temporary for dealing with 17303 * x/y points in the transparent region computations. 17304 */ 17305 final int[] mTransparentLocation = new int[2]; 17306 17307 /** 17308 * Global to the view hierarchy used as a temporary for dealing with 17309 * x/y points in the ViewGroup.invalidateChild implementation. 17310 */ 17311 final int[] mInvalidateChildLocation = new int[2]; 17312 17313 17314 /** 17315 * Global to the view hierarchy used as a temporary for dealing with 17316 * x/y location when view is transformed. 17317 */ 17318 final float[] mTmpTransformLocation = new float[2]; 17319 17320 /** 17321 * The view tree observer used to dispatch global events like 17322 * layout, pre-draw, touch mode change, etc. 17323 */ 17324 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17325 17326 /** 17327 * A Canvas used by the view hierarchy to perform bitmap caching. 17328 */ 17329 Canvas mCanvas; 17330 17331 /** 17332 * The view root impl. 17333 */ 17334 final ViewRootImpl mViewRootImpl; 17335 17336 /** 17337 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17338 * handler can be used to pump events in the UI events queue. 17339 */ 17340 final Handler mHandler; 17341 17342 /** 17343 * Temporary for use in computing invalidate rectangles while 17344 * calling up the hierarchy. 17345 */ 17346 final Rect mTmpInvalRect = new Rect(); 17347 17348 /** 17349 * Temporary for use in computing hit areas with transformed views 17350 */ 17351 final RectF mTmpTransformRect = new RectF(); 17352 17353 /** 17354 * Temporary list for use in collecting focusable descendents of a view. 17355 */ 17356 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17357 17358 /** 17359 * The id of the window for accessibility purposes. 17360 */ 17361 int mAccessibilityWindowId = View.NO_ID; 17362 17363 /** 17364 * Whether to ingore not exposed for accessibility Views when 17365 * reporting the view tree to accessibility services. 17366 */ 17367 boolean mIncludeNotImportantViews; 17368 17369 /** 17370 * The drawable for highlighting accessibility focus. 17371 */ 17372 Drawable mAccessibilityFocusDrawable; 17373 17374 /** 17375 * Show where the margins, bounds and layout bounds are for each view. 17376 */ 17377 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17378 17379 /** 17380 * Point used to compute visible regions. 17381 */ 17382 final Point mPoint = new Point(); 17383 17384 /** 17385 * Creates a new set of attachment information with the specified 17386 * events handler and thread. 17387 * 17388 * @param handler the events handler the view must use 17389 */ 17390 AttachInfo(IWindowSession session, IWindow window, 17391 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17392 mSession = session; 17393 mWindow = window; 17394 mWindowToken = window.asBinder(); 17395 mViewRootImpl = viewRootImpl; 17396 mHandler = handler; 17397 mRootCallbacks = effectPlayer; 17398 } 17399 } 17400 17401 /** 17402 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17403 * is supported. This avoids keeping too many unused fields in most 17404 * instances of View.</p> 17405 */ 17406 private static class ScrollabilityCache implements Runnable { 17407 17408 /** 17409 * Scrollbars are not visible 17410 */ 17411 public static final int OFF = 0; 17412 17413 /** 17414 * Scrollbars are visible 17415 */ 17416 public static final int ON = 1; 17417 17418 /** 17419 * Scrollbars are fading away 17420 */ 17421 public static final int FADING = 2; 17422 17423 public boolean fadeScrollBars; 17424 17425 public int fadingEdgeLength; 17426 public int scrollBarDefaultDelayBeforeFade; 17427 public int scrollBarFadeDuration; 17428 17429 public int scrollBarSize; 17430 public ScrollBarDrawable scrollBar; 17431 public float[] interpolatorValues; 17432 public View host; 17433 17434 public final Paint paint; 17435 public final Matrix matrix; 17436 public Shader shader; 17437 17438 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17439 17440 private static final float[] OPAQUE = { 255 }; 17441 private static final float[] TRANSPARENT = { 0.0f }; 17442 17443 /** 17444 * When fading should start. This time moves into the future every time 17445 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17446 */ 17447 public long fadeStartTime; 17448 17449 17450 /** 17451 * The current state of the scrollbars: ON, OFF, or FADING 17452 */ 17453 public int state = OFF; 17454 17455 private int mLastColor; 17456 17457 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17458 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17459 scrollBarSize = configuration.getScaledScrollBarSize(); 17460 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17461 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17462 17463 paint = new Paint(); 17464 matrix = new Matrix(); 17465 // use use a height of 1, and then wack the matrix each time we 17466 // actually use it. 17467 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17468 17469 paint.setShader(shader); 17470 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17471 this.host = host; 17472 } 17473 17474 public void setFadeColor(int color) { 17475 if (color != 0 && color != mLastColor) { 17476 mLastColor = color; 17477 color |= 0xFF000000; 17478 17479 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17480 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17481 17482 paint.setShader(shader); 17483 // Restore the default transfer mode (src_over) 17484 paint.setXfermode(null); 17485 } 17486 } 17487 17488 public void run() { 17489 long now = AnimationUtils.currentAnimationTimeMillis(); 17490 if (now >= fadeStartTime) { 17491 17492 // the animation fades the scrollbars out by changing 17493 // the opacity (alpha) from fully opaque to fully 17494 // transparent 17495 int nextFrame = (int) now; 17496 int framesCount = 0; 17497 17498 Interpolator interpolator = scrollBarInterpolator; 17499 17500 // Start opaque 17501 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17502 17503 // End transparent 17504 nextFrame += scrollBarFadeDuration; 17505 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17506 17507 state = FADING; 17508 17509 // Kick off the fade animation 17510 host.invalidate(true); 17511 } 17512 } 17513 } 17514 17515 /** 17516 * Resuable callback for sending 17517 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17518 */ 17519 private class SendViewScrolledAccessibilityEvent implements Runnable { 17520 public volatile boolean mIsPending; 17521 17522 public void run() { 17523 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17524 mIsPending = false; 17525 } 17526 } 17527 17528 /** 17529 * <p> 17530 * This class represents a delegate that can be registered in a {@link View} 17531 * to enhance accessibility support via composition rather via inheritance. 17532 * It is specifically targeted to widget developers that extend basic View 17533 * classes i.e. classes in package android.view, that would like their 17534 * applications to be backwards compatible. 17535 * </p> 17536 * <div class="special reference"> 17537 * <h3>Developer Guides</h3> 17538 * <p>For more information about making applications accessible, read the 17539 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17540 * developer guide.</p> 17541 * </div> 17542 * <p> 17543 * A scenario in which a developer would like to use an accessibility delegate 17544 * is overriding a method introduced in a later API version then the minimal API 17545 * version supported by the application. For example, the method 17546 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17547 * in API version 4 when the accessibility APIs were first introduced. If a 17548 * developer would like his application to run on API version 4 devices (assuming 17549 * all other APIs used by the application are version 4 or lower) and take advantage 17550 * of this method, instead of overriding the method which would break the application's 17551 * backwards compatibility, he can override the corresponding method in this 17552 * delegate and register the delegate in the target View if the API version of 17553 * the system is high enough i.e. the API version is same or higher to the API 17554 * version that introduced 17555 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17556 * </p> 17557 * <p> 17558 * Here is an example implementation: 17559 * </p> 17560 * <code><pre><p> 17561 * if (Build.VERSION.SDK_INT >= 14) { 17562 * // If the API version is equal of higher than the version in 17563 * // which onInitializeAccessibilityNodeInfo was introduced we 17564 * // register a delegate with a customized implementation. 17565 * View view = findViewById(R.id.view_id); 17566 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17567 * public void onInitializeAccessibilityNodeInfo(View host, 17568 * AccessibilityNodeInfo info) { 17569 * // Let the default implementation populate the info. 17570 * super.onInitializeAccessibilityNodeInfo(host, info); 17571 * // Set some other information. 17572 * info.setEnabled(host.isEnabled()); 17573 * } 17574 * }); 17575 * } 17576 * </code></pre></p> 17577 * <p> 17578 * This delegate contains methods that correspond to the accessibility methods 17579 * in View. If a delegate has been specified the implementation in View hands 17580 * off handling to the corresponding method in this delegate. The default 17581 * implementation the delegate methods behaves exactly as the corresponding 17582 * method in View for the case of no accessibility delegate been set. Hence, 17583 * to customize the behavior of a View method, clients can override only the 17584 * corresponding delegate method without altering the behavior of the rest 17585 * accessibility related methods of the host view. 17586 * </p> 17587 */ 17588 public static class AccessibilityDelegate { 17589 17590 /** 17591 * Sends an accessibility event of the given type. If accessibility is not 17592 * enabled this method has no effect. 17593 * <p> 17594 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17595 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17596 * been set. 17597 * </p> 17598 * 17599 * @param host The View hosting the delegate. 17600 * @param eventType The type of the event to send. 17601 * 17602 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17603 */ 17604 public void sendAccessibilityEvent(View host, int eventType) { 17605 host.sendAccessibilityEventInternal(eventType); 17606 } 17607 17608 /** 17609 * Performs the specified accessibility action on the view. For 17610 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17611 * <p> 17612 * The default implementation behaves as 17613 * {@link View#performAccessibilityAction(int, Bundle) 17614 * View#performAccessibilityAction(int, Bundle)} for the case of 17615 * no accessibility delegate been set. 17616 * </p> 17617 * 17618 * @param action The action to perform. 17619 * @return Whether the action was performed. 17620 * 17621 * @see View#performAccessibilityAction(int, Bundle) 17622 * View#performAccessibilityAction(int, Bundle) 17623 */ 17624 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17625 return host.performAccessibilityActionInternal(action, args); 17626 } 17627 17628 /** 17629 * Sends an accessibility event. This method behaves exactly as 17630 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17631 * empty {@link AccessibilityEvent} and does not perform a check whether 17632 * accessibility is enabled. 17633 * <p> 17634 * The default implementation behaves as 17635 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17636 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17637 * the case of no accessibility delegate been set. 17638 * </p> 17639 * 17640 * @param host The View hosting the delegate. 17641 * @param event The event to send. 17642 * 17643 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17644 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17645 */ 17646 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17647 host.sendAccessibilityEventUncheckedInternal(event); 17648 } 17649 17650 /** 17651 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17652 * to its children for adding their text content to the event. 17653 * <p> 17654 * The default implementation behaves as 17655 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17656 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17657 * the case of no accessibility delegate been set. 17658 * </p> 17659 * 17660 * @param host The View hosting the delegate. 17661 * @param event The event. 17662 * @return True if the event population was completed. 17663 * 17664 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17665 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17666 */ 17667 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17668 return host.dispatchPopulateAccessibilityEventInternal(event); 17669 } 17670 17671 /** 17672 * Gives a chance to the host View to populate the accessibility event with its 17673 * text content. 17674 * <p> 17675 * The default implementation behaves as 17676 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17677 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17678 * the case of no accessibility delegate been set. 17679 * </p> 17680 * 17681 * @param host The View hosting the delegate. 17682 * @param event The accessibility event which to populate. 17683 * 17684 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17685 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17686 */ 17687 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17688 host.onPopulateAccessibilityEventInternal(event); 17689 } 17690 17691 /** 17692 * Initializes an {@link AccessibilityEvent} with information about the 17693 * the host View which is the event source. 17694 * <p> 17695 * The default implementation behaves as 17696 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17697 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17698 * the case of no accessibility delegate been set. 17699 * </p> 17700 * 17701 * @param host The View hosting the delegate. 17702 * @param event The event to initialize. 17703 * 17704 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17705 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17706 */ 17707 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17708 host.onInitializeAccessibilityEventInternal(event); 17709 } 17710 17711 /** 17712 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17713 * <p> 17714 * The default implementation behaves as 17715 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17716 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17717 * the case of no accessibility delegate been set. 17718 * </p> 17719 * 17720 * @param host The View hosting the delegate. 17721 * @param info The instance to initialize. 17722 * 17723 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17724 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17725 */ 17726 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17727 host.onInitializeAccessibilityNodeInfoInternal(info); 17728 } 17729 17730 /** 17731 * Called when a child of the host View has requested sending an 17732 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17733 * to augment the event. 17734 * <p> 17735 * The default implementation behaves as 17736 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17737 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17738 * the case of no accessibility delegate been set. 17739 * </p> 17740 * 17741 * @param host The View hosting the delegate. 17742 * @param child The child which requests sending the event. 17743 * @param event The event to be sent. 17744 * @return True if the event should be sent 17745 * 17746 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17747 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17748 */ 17749 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17750 AccessibilityEvent event) { 17751 return host.onRequestSendAccessibilityEventInternal(child, event); 17752 } 17753 17754 /** 17755 * Gets the provider for managing a virtual view hierarchy rooted at this View 17756 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17757 * that explore the window content. 17758 * <p> 17759 * The default implementation behaves as 17760 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17761 * the case of no accessibility delegate been set. 17762 * </p> 17763 * 17764 * @return The provider. 17765 * 17766 * @see AccessibilityNodeProvider 17767 */ 17768 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17769 return null; 17770 } 17771 } 17772} 17773