View.java revision 425f126a0f2284423f4ccea0b00fbd5ea670a6c9
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93 94/** 95 * <p> 96 * This class represents the basic building block for user interface components. A View 97 * occupies a rectangular area on the screen and is responsible for drawing and 98 * event handling. View is the base class for <em>widgets</em>, which are 99 * used to create interactive UI components (buttons, text fields, etc.). The 100 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 101 * are invisible containers that hold other Views (or other ViewGroups) and define 102 * their layout properties. 103 * </p> 104 * 105 * <div class="special reference"> 106 * <h3>Developer Guides</h3> 107 * <p>For information about using this class to develop your application's user interface, 108 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 347 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 348 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 349 * {@link #getPaddingEnd()}. 350 * </p> 351 * 352 * <p> 353 * Even though a view can define a padding, it does not provide any support for 354 * margins. However, view groups provide such a support. Refer to 355 * {@link android.view.ViewGroup} and 356 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 357 * </p> 358 * 359 * <a name="Layout"></a> 360 * <h3>Layout</h3> 361 * <p> 362 * Layout is a two pass process: a measure pass and a layout pass. The measuring 363 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 364 * of the view tree. Each view pushes dimension specifications down the tree 365 * during the recursion. At the end of the measure pass, every view has stored 366 * its measurements. The second pass happens in 367 * {@link #layout(int,int,int,int)} and is also top-down. During 368 * this pass each parent is responsible for positioning all of its children 369 * using the sizes computed in the measure pass. 370 * </p> 371 * 372 * <p> 373 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 374 * {@link #getMeasuredHeight()} values must be set, along with those for all of 375 * that view's descendants. A view's measured width and measured height values 376 * must respect the constraints imposed by the view's parents. This guarantees 377 * that at the end of the measure pass, all parents accept all of their 378 * children's measurements. A parent view may call measure() more than once on 379 * its children. For example, the parent may measure each child once with 380 * unspecified dimensions to find out how big they want to be, then call 381 * measure() on them again with actual numbers if the sum of all the children's 382 * unconstrained sizes is too big or too small. 383 * </p> 384 * 385 * <p> 386 * The measure pass uses two classes to communicate dimensions. The 387 * {@link MeasureSpec} class is used by views to tell their parents how they 388 * want to be measured and positioned. The base LayoutParams class just 389 * describes how big the view wants to be for both width and height. For each 390 * dimension, it can specify one of: 391 * <ul> 392 * <li> an exact number 393 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 394 * (minus padding) 395 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 396 * enclose its content (plus padding). 397 * </ul> 398 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 399 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 400 * an X and Y value. 401 * </p> 402 * 403 * <p> 404 * MeasureSpecs are used to push requirements down the tree from parent to 405 * child. A MeasureSpec can be in one of three modes: 406 * <ul> 407 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 408 * of a child view. For example, a LinearLayout may call measure() on its child 409 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 410 * tall the child view wants to be given a width of 240 pixels. 411 * <li>EXACTLY: This is used by the parent to impose an exact size on the 412 * child. The child must use this size, and guarantee that all of its 413 * descendants will fit within this size. 414 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 415 * child. The child must gurantee that it and all of its descendants will fit 416 * within this size. 417 * </ul> 418 * </p> 419 * 420 * <p> 421 * To intiate a layout, call {@link #requestLayout}. This method is typically 422 * called by a view on itself when it believes that is can no longer fit within 423 * its current bounds. 424 * </p> 425 * 426 * <a name="Drawing"></a> 427 * <h3>Drawing</h3> 428 * <p> 429 * Drawing is handled by walking the tree and rendering each view that 430 * intersects the invalid region. Because the tree is traversed in-order, 431 * this means that parents will draw before (i.e., behind) their children, with 432 * siblings drawn in the order they appear in the tree. 433 * If you set a background drawable for a View, then the View will draw it for you 434 * before calling back to its <code>onDraw()</code> method. 435 * </p> 436 * 437 * <p> 438 * Note that the framework will not draw views that are not in the invalid region. 439 * </p> 440 * 441 * <p> 442 * To force a view to draw, call {@link #invalidate()}. 443 * </p> 444 * 445 * <a name="EventHandlingThreading"></a> 446 * <h3>Event Handling and Threading</h3> 447 * <p> 448 * The basic cycle of a view is as follows: 449 * <ol> 450 * <li>An event comes in and is dispatched to the appropriate view. The view 451 * handles the event and notifies any listeners.</li> 452 * <li>If in the course of processing the event, the view's bounds may need 453 * to be changed, the view will call {@link #requestLayout()}.</li> 454 * <li>Similarly, if in the course of processing the event the view's appearance 455 * may need to be changed, the view will call {@link #invalidate()}.</li> 456 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 457 * the framework will take care of measuring, laying out, and drawing the tree 458 * as appropriate.</li> 459 * </ol> 460 * </p> 461 * 462 * <p><em>Note: The entire view tree is single threaded. You must always be on 463 * the UI thread when calling any method on any view.</em> 464 * If you are doing work on other threads and want to update the state of a view 465 * from that thread, you should use a {@link Handler}. 466 * </p> 467 * 468 * <a name="FocusHandling"></a> 469 * <h3>Focus Handling</h3> 470 * <p> 471 * The framework will handle routine focus movement in response to user input. 472 * This includes changing the focus as views are removed or hidden, or as new 473 * views become available. Views indicate their willingness to take focus 474 * through the {@link #isFocusable} method. To change whether a view can take 475 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 476 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 477 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 478 * </p> 479 * <p> 480 * Focus movement is based on an algorithm which finds the nearest neighbor in a 481 * given direction. In rare cases, the default algorithm may not match the 482 * intended behavior of the developer. In these situations, you can provide 483 * explicit overrides by using these XML attributes in the layout file: 484 * <pre> 485 * nextFocusDown 486 * nextFocusLeft 487 * nextFocusRight 488 * nextFocusUp 489 * </pre> 490 * </p> 491 * 492 * 493 * <p> 494 * To get a particular view to take focus, call {@link #requestFocus()}. 495 * </p> 496 * 497 * <a name="TouchMode"></a> 498 * <h3>Touch Mode</h3> 499 * <p> 500 * When a user is navigating a user interface via directional keys such as a D-pad, it is 501 * necessary to give focus to actionable items such as buttons so the user can see 502 * what will take input. If the device has touch capabilities, however, and the user 503 * begins interacting with the interface by touching it, it is no longer necessary to 504 * always highlight, or give focus to, a particular view. This motivates a mode 505 * for interaction named 'touch mode'. 506 * </p> 507 * <p> 508 * For a touch capable device, once the user touches the screen, the device 509 * will enter touch mode. From this point onward, only views for which 510 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 511 * Other views that are touchable, like buttons, will not take focus when touched; they will 512 * only fire the on click listeners. 513 * </p> 514 * <p> 515 * Any time a user hits a directional key, such as a D-pad direction, the view device will 516 * exit touch mode, and find a view to take focus, so that the user may resume interacting 517 * with the user interface without touching the screen again. 518 * </p> 519 * <p> 520 * The touch mode state is maintained across {@link android.app.Activity}s. Call 521 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 522 * </p> 523 * 524 * <a name="Scrolling"></a> 525 * <h3>Scrolling</h3> 526 * <p> 527 * The framework provides basic support for views that wish to internally 528 * scroll their content. This includes keeping track of the X and Y scroll 529 * offset as well as mechanisms for drawing scrollbars. See 530 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 531 * {@link #awakenScrollBars()} for more details. 532 * </p> 533 * 534 * <a name="Tags"></a> 535 * <h3>Tags</h3> 536 * <p> 537 * Unlike IDs, tags are not used to identify views. Tags are essentially an 538 * extra piece of information that can be associated with a view. They are most 539 * often used as a convenience to store data related to views in the views 540 * themselves rather than by putting them in a separate structure. 541 * </p> 542 * 543 * <a name="Properties"></a> 544 * <h3>Properties</h3> 545 * <p> 546 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 547 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 548 * available both in the {@link Property} form as well as in similarly-named setter/getter 549 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 550 * be used to set persistent state associated with these rendering-related properties on the view. 551 * The properties and methods can also be used in conjunction with 552 * {@link android.animation.Animator Animator}-based animations, described more in the 553 * <a href="#Animation">Animation</a> section. 554 * </p> 555 * 556 * <a name="Animation"></a> 557 * <h3>Animation</h3> 558 * <p> 559 * Starting with Android 3.0, the preferred way of animating views is to use the 560 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 561 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 562 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 563 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 564 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 565 * makes animating these View properties particularly easy and efficient. 566 * </p> 567 * <p> 568 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 569 * You can attach an {@link Animation} object to a view using 570 * {@link #setAnimation(Animation)} or 571 * {@link #startAnimation(Animation)}. The animation can alter the scale, 572 * rotation, translation and alpha of a view over time. If the animation is 573 * attached to a view that has children, the animation will affect the entire 574 * subtree rooted by that node. When an animation is started, the framework will 575 * take care of redrawing the appropriate views until the animation completes. 576 * </p> 577 * 578 * <a name="Security"></a> 579 * <h3>Security</h3> 580 * <p> 581 * Sometimes it is essential that an application be able to verify that an action 582 * is being performed with the full knowledge and consent of the user, such as 583 * granting a permission request, making a purchase or clicking on an advertisement. 584 * Unfortunately, a malicious application could try to spoof the user into 585 * performing these actions, unaware, by concealing the intended purpose of the view. 586 * As a remedy, the framework offers a touch filtering mechanism that can be used to 587 * improve the security of views that provide access to sensitive functionality. 588 * </p><p> 589 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 590 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 591 * will discard touches that are received whenever the view's window is obscured by 592 * another visible window. As a result, the view will not receive touches whenever a 593 * toast, dialog or other window appears above the view's window. 594 * </p><p> 595 * For more fine-grained control over security, consider overriding the 596 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 597 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 598 * </p> 599 * 600 * @attr ref android.R.styleable#View_alpha 601 * @attr ref android.R.styleable#View_background 602 * @attr ref android.R.styleable#View_clickable 603 * @attr ref android.R.styleable#View_contentDescription 604 * @attr ref android.R.styleable#View_drawingCacheQuality 605 * @attr ref android.R.styleable#View_duplicateParentState 606 * @attr ref android.R.styleable#View_id 607 * @attr ref android.R.styleable#View_requiresFadingEdge 608 * @attr ref android.R.styleable#View_fadeScrollbars 609 * @attr ref android.R.styleable#View_fadingEdgeLength 610 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 611 * @attr ref android.R.styleable#View_fitsSystemWindows 612 * @attr ref android.R.styleable#View_isScrollContainer 613 * @attr ref android.R.styleable#View_focusable 614 * @attr ref android.R.styleable#View_focusableInTouchMode 615 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 616 * @attr ref android.R.styleable#View_keepScreenOn 617 * @attr ref android.R.styleable#View_layerType 618 * @attr ref android.R.styleable#View_longClickable 619 * @attr ref android.R.styleable#View_minHeight 620 * @attr ref android.R.styleable#View_minWidth 621 * @attr ref android.R.styleable#View_nextFocusDown 622 * @attr ref android.R.styleable#View_nextFocusLeft 623 * @attr ref android.R.styleable#View_nextFocusRight 624 * @attr ref android.R.styleable#View_nextFocusUp 625 * @attr ref android.R.styleable#View_onClick 626 * @attr ref android.R.styleable#View_padding 627 * @attr ref android.R.styleable#View_paddingBottom 628 * @attr ref android.R.styleable#View_paddingLeft 629 * @attr ref android.R.styleable#View_paddingRight 630 * @attr ref android.R.styleable#View_paddingTop 631 * @attr ref android.R.styleable#View_paddingStart 632 * @attr ref android.R.styleable#View_paddingEnd 633 * @attr ref android.R.styleable#View_saveEnabled 634 * @attr ref android.R.styleable#View_rotation 635 * @attr ref android.R.styleable#View_rotationX 636 * @attr ref android.R.styleable#View_rotationY 637 * @attr ref android.R.styleable#View_scaleX 638 * @attr ref android.R.styleable#View_scaleY 639 * @attr ref android.R.styleable#View_scrollX 640 * @attr ref android.R.styleable#View_scrollY 641 * @attr ref android.R.styleable#View_scrollbarSize 642 * @attr ref android.R.styleable#View_scrollbarStyle 643 * @attr ref android.R.styleable#View_scrollbars 644 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 645 * @attr ref android.R.styleable#View_scrollbarFadeDuration 646 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 647 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 648 * @attr ref android.R.styleable#View_scrollbarThumbVertical 649 * @attr ref android.R.styleable#View_scrollbarTrackVertical 650 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 651 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 652 * @attr ref android.R.styleable#View_soundEffectsEnabled 653 * @attr ref android.R.styleable#View_tag 654 * @attr ref android.R.styleable#View_textAlignment 655 * @attr ref android.R.styleable#View_transformPivotX 656 * @attr ref android.R.styleable#View_transformPivotY 657 * @attr ref android.R.styleable#View_translationX 658 * @attr ref android.R.styleable#View_translationY 659 * @attr ref android.R.styleable#View_visibility 660 * 661 * @see android.view.ViewGroup 662 */ 663public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 664 AccessibilityEventSource { 665 private static final boolean DBG = false; 666 667 /** 668 * The logging tag used by this class with android.util.Log. 669 */ 670 protected static final String VIEW_LOG_TAG = "View"; 671 672 /** 673 * When set to true, apps will draw debugging information about their layouts. 674 * 675 * @hide 676 */ 677 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 678 679 /** 680 * Used to mark a View that has no ID. 681 */ 682 public static final int NO_ID = -1; 683 684 /** 685 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 686 * calling setFlags. 687 */ 688 private static final int NOT_FOCUSABLE = 0x00000000; 689 690 /** 691 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 692 * setFlags. 693 */ 694 private static final int FOCUSABLE = 0x00000001; 695 696 /** 697 * Mask for use with setFlags indicating bits used for focus. 698 */ 699 private static final int FOCUSABLE_MASK = 0x00000001; 700 701 /** 702 * This view will adjust its padding to fit sytem windows (e.g. status bar) 703 */ 704 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 705 706 /** 707 * This view is visible. 708 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 709 * android:visibility}. 710 */ 711 public static final int VISIBLE = 0x00000000; 712 713 /** 714 * This view is invisible, but it still takes up space for layout purposes. 715 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 716 * android:visibility}. 717 */ 718 public static final int INVISIBLE = 0x00000004; 719 720 /** 721 * This view is invisible, and it doesn't take any space for layout 722 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 723 * android:visibility}. 724 */ 725 public static final int GONE = 0x00000008; 726 727 /** 728 * Mask for use with setFlags indicating bits used for visibility. 729 * {@hide} 730 */ 731 static final int VISIBILITY_MASK = 0x0000000C; 732 733 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 734 735 /** 736 * This view is enabled. Interpretation varies by subclass. 737 * Use with ENABLED_MASK when calling setFlags. 738 * {@hide} 739 */ 740 static final int ENABLED = 0x00000000; 741 742 /** 743 * This view is disabled. Interpretation varies by subclass. 744 * Use with ENABLED_MASK when calling setFlags. 745 * {@hide} 746 */ 747 static final int DISABLED = 0x00000020; 748 749 /** 750 * Mask for use with setFlags indicating bits used for indicating whether 751 * this view is enabled 752 * {@hide} 753 */ 754 static final int ENABLED_MASK = 0x00000020; 755 756 /** 757 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 758 * called and further optimizations will be performed. It is okay to have 759 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 760 * {@hide} 761 */ 762 static final int WILL_NOT_DRAW = 0x00000080; 763 764 /** 765 * Mask for use with setFlags indicating bits used for indicating whether 766 * this view is will draw 767 * {@hide} 768 */ 769 static final int DRAW_MASK = 0x00000080; 770 771 /** 772 * <p>This view doesn't show scrollbars.</p> 773 * {@hide} 774 */ 775 static final int SCROLLBARS_NONE = 0x00000000; 776 777 /** 778 * <p>This view shows horizontal scrollbars.</p> 779 * {@hide} 780 */ 781 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 782 783 /** 784 * <p>This view shows vertical scrollbars.</p> 785 * {@hide} 786 */ 787 static final int SCROLLBARS_VERTICAL = 0x00000200; 788 789 /** 790 * <p>Mask for use with setFlags indicating bits used for indicating which 791 * scrollbars are enabled.</p> 792 * {@hide} 793 */ 794 static final int SCROLLBARS_MASK = 0x00000300; 795 796 /** 797 * Indicates that the view should filter touches when its window is obscured. 798 * Refer to the class comments for more information about this security feature. 799 * {@hide} 800 */ 801 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 802 803 /** 804 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 805 * that they are optional and should be skipped if the window has 806 * requested system UI flags that ignore those insets for layout. 807 */ 808 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 809 810 /** 811 * <p>This view doesn't show fading edges.</p> 812 * {@hide} 813 */ 814 static final int FADING_EDGE_NONE = 0x00000000; 815 816 /** 817 * <p>This view shows horizontal fading edges.</p> 818 * {@hide} 819 */ 820 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 821 822 /** 823 * <p>This view shows vertical fading edges.</p> 824 * {@hide} 825 */ 826 static final int FADING_EDGE_VERTICAL = 0x00002000; 827 828 /** 829 * <p>Mask for use with setFlags indicating bits used for indicating which 830 * fading edges are enabled.</p> 831 * {@hide} 832 */ 833 static final int FADING_EDGE_MASK = 0x00003000; 834 835 /** 836 * <p>Indicates this view can be clicked. When clickable, a View reacts 837 * to clicks by notifying the OnClickListener.<p> 838 * {@hide} 839 */ 840 static final int CLICKABLE = 0x00004000; 841 842 /** 843 * <p>Indicates this view is caching its drawing into a bitmap.</p> 844 * {@hide} 845 */ 846 static final int DRAWING_CACHE_ENABLED = 0x00008000; 847 848 /** 849 * <p>Indicates that no icicle should be saved for this view.<p> 850 * {@hide} 851 */ 852 static final int SAVE_DISABLED = 0x000010000; 853 854 /** 855 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 856 * property.</p> 857 * {@hide} 858 */ 859 static final int SAVE_DISABLED_MASK = 0x000010000; 860 861 /** 862 * <p>Indicates that no drawing cache should ever be created for this view.<p> 863 * {@hide} 864 */ 865 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 866 867 /** 868 * <p>Indicates this view can take / keep focus when int touch mode.</p> 869 * {@hide} 870 */ 871 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 872 873 /** 874 * <p>Enables low quality mode for the drawing cache.</p> 875 */ 876 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 877 878 /** 879 * <p>Enables high quality mode for the drawing cache.</p> 880 */ 881 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 882 883 /** 884 * <p>Enables automatic quality mode for the drawing cache.</p> 885 */ 886 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 887 888 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 889 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 890 }; 891 892 /** 893 * <p>Mask for use with setFlags indicating bits used for the cache 894 * quality property.</p> 895 * {@hide} 896 */ 897 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 898 899 /** 900 * <p> 901 * Indicates this view can be long clicked. When long clickable, a View 902 * reacts to long clicks by notifying the OnLongClickListener or showing a 903 * context menu. 904 * </p> 905 * {@hide} 906 */ 907 static final int LONG_CLICKABLE = 0x00200000; 908 909 /** 910 * <p>Indicates that this view gets its drawable states from its direct parent 911 * and ignores its original internal states.</p> 912 * 913 * @hide 914 */ 915 static final int DUPLICATE_PARENT_STATE = 0x00400000; 916 917 /** 918 * The scrollbar style to display the scrollbars inside the content area, 919 * without increasing the padding. The scrollbars will be overlaid with 920 * translucency on the view's content. 921 */ 922 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 923 924 /** 925 * The scrollbar style to display the scrollbars inside the padded area, 926 * increasing the padding of the view. The scrollbars will not overlap the 927 * content area of the view. 928 */ 929 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 930 931 /** 932 * The scrollbar style to display the scrollbars at the edge of the view, 933 * without increasing the padding. The scrollbars will be overlaid with 934 * translucency. 935 */ 936 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 937 938 /** 939 * The scrollbar style to display the scrollbars at the edge of the view, 940 * increasing the padding of the view. The scrollbars will only overlap the 941 * background, if any. 942 */ 943 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 944 945 /** 946 * Mask to check if the scrollbar style is overlay or inset. 947 * {@hide} 948 */ 949 static final int SCROLLBARS_INSET_MASK = 0x01000000; 950 951 /** 952 * Mask to check if the scrollbar style is inside or outside. 953 * {@hide} 954 */ 955 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 956 957 /** 958 * Mask for scrollbar style. 959 * {@hide} 960 */ 961 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 962 963 /** 964 * View flag indicating that the screen should remain on while the 965 * window containing this view is visible to the user. This effectively 966 * takes care of automatically setting the WindowManager's 967 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 968 */ 969 public static final int KEEP_SCREEN_ON = 0x04000000; 970 971 /** 972 * View flag indicating whether this view should have sound effects enabled 973 * for events such as clicking and touching. 974 */ 975 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 976 977 /** 978 * View flag indicating whether this view should have haptic feedback 979 * enabled for events such as long presses. 980 */ 981 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 982 983 /** 984 * <p>Indicates that the view hierarchy should stop saving state when 985 * it reaches this view. If state saving is initiated immediately at 986 * the view, it will be allowed. 987 * {@hide} 988 */ 989 static final int PARENT_SAVE_DISABLED = 0x20000000; 990 991 /** 992 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 993 * {@hide} 994 */ 995 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 996 997 /** 998 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 999 * should add all focusable Views regardless if they are focusable in touch mode. 1000 */ 1001 public static final int FOCUSABLES_ALL = 0x00000000; 1002 1003 /** 1004 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1005 * should add only Views focusable in touch mode. 1006 */ 1007 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add only accessibility focusable Views. 1012 * 1013 * @hide 1014 */ 1015 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1016 1017 /** 1018 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1019 * item. 1020 */ 1021 public static final int FOCUS_BACKWARD = 0x00000001; 1022 1023 /** 1024 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1025 * item. 1026 */ 1027 public static final int FOCUS_FORWARD = 0x00000002; 1028 1029 /** 1030 * Use with {@link #focusSearch(int)}. Move focus to the left. 1031 */ 1032 public static final int FOCUS_LEFT = 0x00000011; 1033 1034 /** 1035 * Use with {@link #focusSearch(int)}. Move focus up. 1036 */ 1037 public static final int FOCUS_UP = 0x00000021; 1038 1039 /** 1040 * Use with {@link #focusSearch(int)}. Move focus to the right. 1041 */ 1042 public static final int FOCUS_RIGHT = 0x00000042; 1043 1044 /** 1045 * Use with {@link #focusSearch(int)}. Move focus down. 1046 */ 1047 public static final int FOCUS_DOWN = 0x00000082; 1048 1049 // Accessibility focus directions. 1050 1051 /** 1052 * The accessibility focus which is the current user position when 1053 * interacting with the accessibility framework. 1054 */ 1055 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1056 1057 /** 1058 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1059 */ 1060 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1061 1062 /** 1063 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1064 */ 1065 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1066 1067 /** 1068 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1069 */ 1070 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1071 1072 /** 1073 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1074 */ 1075 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1076 1077 /** 1078 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1079 */ 1080 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1081 1082 /** 1083 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1084 */ 1085 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1086 1087 /** 1088 * Bits of {@link #getMeasuredWidthAndState()} and 1089 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1090 */ 1091 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1092 1093 /** 1094 * Bits of {@link #getMeasuredWidthAndState()} and 1095 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1096 */ 1097 public static final int MEASURED_STATE_MASK = 0xff000000; 1098 1099 /** 1100 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1101 * for functions that combine both width and height into a single int, 1102 * such as {@link #getMeasuredState()} and the childState argument of 1103 * {@link #resolveSizeAndState(int, int, int)}. 1104 */ 1105 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1106 1107 /** 1108 * Bit of {@link #getMeasuredWidthAndState()} and 1109 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1110 * is smaller that the space the view would like to have. 1111 */ 1112 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1113 1114 /** 1115 * Base View state sets 1116 */ 1117 // Singles 1118 /** 1119 * Indicates the view has no states set. States are used with 1120 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1121 * view depending on its state. 1122 * 1123 * @see android.graphics.drawable.Drawable 1124 * @see #getDrawableState() 1125 */ 1126 protected static final int[] EMPTY_STATE_SET; 1127 /** 1128 * Indicates the view is enabled. States are used with 1129 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1130 * view depending on its state. 1131 * 1132 * @see android.graphics.drawable.Drawable 1133 * @see #getDrawableState() 1134 */ 1135 protected static final int[] ENABLED_STATE_SET; 1136 /** 1137 * Indicates the view is focused. States are used with 1138 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1139 * view depending on its state. 1140 * 1141 * @see android.graphics.drawable.Drawable 1142 * @see #getDrawableState() 1143 */ 1144 protected static final int[] FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is selected. States are used with 1147 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1148 * view depending on its state. 1149 * 1150 * @see android.graphics.drawable.Drawable 1151 * @see #getDrawableState() 1152 */ 1153 protected static final int[] SELECTED_STATE_SET; 1154 /** 1155 * Indicates the view is pressed. States are used with 1156 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1157 * view depending on its state. 1158 * 1159 * @see android.graphics.drawable.Drawable 1160 * @see #getDrawableState() 1161 * @hide 1162 */ 1163 protected static final int[] PRESSED_STATE_SET; 1164 /** 1165 * Indicates the view's window has focus. States are used with 1166 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1167 * view depending on its state. 1168 * 1169 * @see android.graphics.drawable.Drawable 1170 * @see #getDrawableState() 1171 */ 1172 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1173 // Doubles 1174 /** 1175 * Indicates the view is enabled and has the focus. 1176 * 1177 * @see #ENABLED_STATE_SET 1178 * @see #FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1181 /** 1182 * Indicates the view is enabled and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #SELECTED_STATE_SET 1186 */ 1187 protected static final int[] ENABLED_SELECTED_STATE_SET; 1188 /** 1189 * Indicates the view is enabled and that its window has focus. 1190 * 1191 * @see #ENABLED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1195 /** 1196 * Indicates the view is focused and selected. 1197 * 1198 * @see #FOCUSED_STATE_SET 1199 * @see #SELECTED_STATE_SET 1200 */ 1201 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1202 /** 1203 * Indicates the view has the focus and that its window has the focus. 1204 * 1205 * @see #FOCUSED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1209 /** 1210 * Indicates the view is selected and that its window has the focus. 1211 * 1212 * @see #SELECTED_STATE_SET 1213 * @see #WINDOW_FOCUSED_STATE_SET 1214 */ 1215 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1216 // Triples 1217 /** 1218 * Indicates the view is enabled, focused and selected. 1219 * 1220 * @see #ENABLED_STATE_SET 1221 * @see #FOCUSED_STATE_SET 1222 * @see #SELECTED_STATE_SET 1223 */ 1224 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1225 /** 1226 * Indicates the view is enabled, focused and its window has the focus. 1227 * 1228 * @see #ENABLED_STATE_SET 1229 * @see #FOCUSED_STATE_SET 1230 * @see #WINDOW_FOCUSED_STATE_SET 1231 */ 1232 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1233 /** 1234 * Indicates the view is enabled, selected and its window has the focus. 1235 * 1236 * @see #ENABLED_STATE_SET 1237 * @see #SELECTED_STATE_SET 1238 * @see #WINDOW_FOCUSED_STATE_SET 1239 */ 1240 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1241 /** 1242 * Indicates the view is focused, selected and its window has the focus. 1243 * 1244 * @see #FOCUSED_STATE_SET 1245 * @see #SELECTED_STATE_SET 1246 * @see #WINDOW_FOCUSED_STATE_SET 1247 */ 1248 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1249 /** 1250 * Indicates the view is enabled, focused, selected and its window 1251 * has the focus. 1252 * 1253 * @see #ENABLED_STATE_SET 1254 * @see #FOCUSED_STATE_SET 1255 * @see #SELECTED_STATE_SET 1256 * @see #WINDOW_FOCUSED_STATE_SET 1257 */ 1258 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1259 /** 1260 * Indicates the view is pressed and its window has the focus. 1261 * 1262 * @see #PRESSED_STATE_SET 1263 * @see #WINDOW_FOCUSED_STATE_SET 1264 */ 1265 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1266 /** 1267 * Indicates the view is pressed and selected. 1268 * 1269 * @see #PRESSED_STATE_SET 1270 * @see #SELECTED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_SELECTED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, selected and its window has the focus. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #SELECTED_STATE_SET 1278 * @see #WINDOW_FOCUSED_STATE_SET 1279 */ 1280 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1281 /** 1282 * Indicates the view is pressed and focused. 1283 * 1284 * @see #PRESSED_STATE_SET 1285 * @see #FOCUSED_STATE_SET 1286 */ 1287 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1288 /** 1289 * Indicates the view is pressed, focused and its window has the focus. 1290 * 1291 * @see #PRESSED_STATE_SET 1292 * @see #FOCUSED_STATE_SET 1293 * @see #WINDOW_FOCUSED_STATE_SET 1294 */ 1295 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1296 /** 1297 * Indicates the view is pressed, focused and selected. 1298 * 1299 * @see #PRESSED_STATE_SET 1300 * @see #SELECTED_STATE_SET 1301 * @see #FOCUSED_STATE_SET 1302 */ 1303 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1304 /** 1305 * Indicates the view is pressed, focused, selected and its window has the focus. 1306 * 1307 * @see #PRESSED_STATE_SET 1308 * @see #FOCUSED_STATE_SET 1309 * @see #SELECTED_STATE_SET 1310 * @see #WINDOW_FOCUSED_STATE_SET 1311 */ 1312 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1313 /** 1314 * Indicates the view is pressed and enabled. 1315 * 1316 * @see #PRESSED_STATE_SET 1317 * @see #ENABLED_STATE_SET 1318 */ 1319 protected static final int[] PRESSED_ENABLED_STATE_SET; 1320 /** 1321 * Indicates the view is pressed, enabled and its window has the focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 */ 1335 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1336 /** 1337 * Indicates the view is pressed, enabled, selected and its window has the 1338 * focus. 1339 * 1340 * @see #PRESSED_STATE_SET 1341 * @see #ENABLED_STATE_SET 1342 * @see #SELECTED_STATE_SET 1343 * @see #WINDOW_FOCUSED_STATE_SET 1344 */ 1345 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1346 /** 1347 * Indicates the view is pressed, enabled and focused. 1348 * 1349 * @see #PRESSED_STATE_SET 1350 * @see #ENABLED_STATE_SET 1351 * @see #FOCUSED_STATE_SET 1352 */ 1353 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1354 /** 1355 * Indicates the view is pressed, enabled, focused and its window has the 1356 * focus. 1357 * 1358 * @see #PRESSED_STATE_SET 1359 * @see #ENABLED_STATE_SET 1360 * @see #FOCUSED_STATE_SET 1361 * @see #WINDOW_FOCUSED_STATE_SET 1362 */ 1363 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1364 /** 1365 * Indicates the view is pressed, enabled, focused and selected. 1366 * 1367 * @see #PRESSED_STATE_SET 1368 * @see #ENABLED_STATE_SET 1369 * @see #SELECTED_STATE_SET 1370 * @see #FOCUSED_STATE_SET 1371 */ 1372 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1373 /** 1374 * Indicates the view is pressed, enabled, focused, selected and its window 1375 * has the focus. 1376 * 1377 * @see #PRESSED_STATE_SET 1378 * @see #ENABLED_STATE_SET 1379 * @see #SELECTED_STATE_SET 1380 * @see #FOCUSED_STATE_SET 1381 * @see #WINDOW_FOCUSED_STATE_SET 1382 */ 1383 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1384 1385 /** 1386 * The order here is very important to {@link #getDrawableState()} 1387 */ 1388 private static final int[][] VIEW_STATE_SETS; 1389 1390 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1391 static final int VIEW_STATE_SELECTED = 1 << 1; 1392 static final int VIEW_STATE_FOCUSED = 1 << 2; 1393 static final int VIEW_STATE_ENABLED = 1 << 3; 1394 static final int VIEW_STATE_PRESSED = 1 << 4; 1395 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1396 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1397 static final int VIEW_STATE_HOVERED = 1 << 7; 1398 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1399 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1400 1401 static final int[] VIEW_STATE_IDS = new int[] { 1402 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1403 R.attr.state_selected, VIEW_STATE_SELECTED, 1404 R.attr.state_focused, VIEW_STATE_FOCUSED, 1405 R.attr.state_enabled, VIEW_STATE_ENABLED, 1406 R.attr.state_pressed, VIEW_STATE_PRESSED, 1407 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1408 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1409 R.attr.state_hovered, VIEW_STATE_HOVERED, 1410 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1411 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1412 }; 1413 1414 static { 1415 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1416 throw new IllegalStateException( 1417 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1418 } 1419 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1420 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1421 int viewState = R.styleable.ViewDrawableStates[i]; 1422 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1423 if (VIEW_STATE_IDS[j] == viewState) { 1424 orderedIds[i * 2] = viewState; 1425 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1426 } 1427 } 1428 } 1429 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1430 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1431 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1432 int numBits = Integer.bitCount(i); 1433 int[] set = new int[numBits]; 1434 int pos = 0; 1435 for (int j = 0; j < orderedIds.length; j += 2) { 1436 if ((i & orderedIds[j+1]) != 0) { 1437 set[pos++] = orderedIds[j]; 1438 } 1439 } 1440 VIEW_STATE_SETS[i] = set; 1441 } 1442 1443 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1444 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1445 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1446 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1448 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1449 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1451 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1453 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1455 | VIEW_STATE_FOCUSED]; 1456 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1457 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1459 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1461 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1463 | VIEW_STATE_ENABLED]; 1464 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1466 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_ENABLED]; 1469 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1471 | VIEW_STATE_ENABLED]; 1472 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1474 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1475 1476 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1477 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1479 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1481 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1482 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1483 | VIEW_STATE_PRESSED]; 1484 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1485 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1486 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1487 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1488 | VIEW_STATE_PRESSED]; 1489 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1490 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1491 | VIEW_STATE_PRESSED]; 1492 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1493 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1494 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1495 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1496 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1497 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1498 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1499 | VIEW_STATE_PRESSED]; 1500 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1501 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1502 | VIEW_STATE_PRESSED]; 1503 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1504 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1505 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1506 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1507 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1508 | VIEW_STATE_PRESSED]; 1509 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1510 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1511 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1512 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1513 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1514 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1515 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1516 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1517 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1518 | VIEW_STATE_PRESSED]; 1519 } 1520 1521 /** 1522 * Accessibility event types that are dispatched for text population. 1523 */ 1524 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1525 AccessibilityEvent.TYPE_VIEW_CLICKED 1526 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1527 | AccessibilityEvent.TYPE_VIEW_SELECTED 1528 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1529 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1531 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1532 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1533 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1534 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1535 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1536 1537 /** 1538 * Temporary Rect currently for use in setBackground(). This will probably 1539 * be extended in the future to hold our own class with more than just 1540 * a Rect. :) 1541 */ 1542 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1543 1544 /** 1545 * Map used to store views' tags. 1546 */ 1547 private SparseArray<Object> mKeyedTags; 1548 1549 /** 1550 * The next available accessiiblity id. 1551 */ 1552 private static int sNextAccessibilityViewId; 1553 1554 /** 1555 * The animation currently associated with this view. 1556 * @hide 1557 */ 1558 protected Animation mCurrentAnimation = null; 1559 1560 /** 1561 * Width as measured during measure pass. 1562 * {@hide} 1563 */ 1564 @ViewDebug.ExportedProperty(category = "measurement") 1565 int mMeasuredWidth; 1566 1567 /** 1568 * Height as measured during measure pass. 1569 * {@hide} 1570 */ 1571 @ViewDebug.ExportedProperty(category = "measurement") 1572 int mMeasuredHeight; 1573 1574 /** 1575 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1576 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1577 * its display list. This flag, used only when hw accelerated, allows us to clear the 1578 * flag while retaining this information until it's needed (at getDisplayList() time and 1579 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1580 * 1581 * {@hide} 1582 */ 1583 boolean mRecreateDisplayList = false; 1584 1585 /** 1586 * The view's identifier. 1587 * {@hide} 1588 * 1589 * @see #setId(int) 1590 * @see #getId() 1591 */ 1592 @ViewDebug.ExportedProperty(resolveId = true) 1593 int mID = NO_ID; 1594 1595 /** 1596 * The stable ID of this view for accessibility purposes. 1597 */ 1598 int mAccessibilityViewId = NO_ID; 1599 1600 /** 1601 * @hide 1602 */ 1603 private int mAccessibilityCursorPosition = -1; 1604 1605 /** 1606 * The view's tag. 1607 * {@hide} 1608 * 1609 * @see #setTag(Object) 1610 * @see #getTag() 1611 */ 1612 protected Object mTag; 1613 1614 // for mPrivateFlags: 1615 /** {@hide} */ 1616 static final int WANTS_FOCUS = 0x00000001; 1617 /** {@hide} */ 1618 static final int FOCUSED = 0x00000002; 1619 /** {@hide} */ 1620 static final int SELECTED = 0x00000004; 1621 /** {@hide} */ 1622 static final int IS_ROOT_NAMESPACE = 0x00000008; 1623 /** {@hide} */ 1624 static final int HAS_BOUNDS = 0x00000010; 1625 /** {@hide} */ 1626 static final int DRAWN = 0x00000020; 1627 /** 1628 * When this flag is set, this view is running an animation on behalf of its 1629 * children and should therefore not cancel invalidate requests, even if they 1630 * lie outside of this view's bounds. 1631 * 1632 * {@hide} 1633 */ 1634 static final int DRAW_ANIMATION = 0x00000040; 1635 /** {@hide} */ 1636 static final int SKIP_DRAW = 0x00000080; 1637 /** {@hide} */ 1638 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1639 /** {@hide} */ 1640 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1641 /** {@hide} */ 1642 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1643 /** {@hide} */ 1644 static final int MEASURED_DIMENSION_SET = 0x00000800; 1645 /** {@hide} */ 1646 static final int FORCE_LAYOUT = 0x00001000; 1647 /** {@hide} */ 1648 static final int LAYOUT_REQUIRED = 0x00002000; 1649 1650 private static final int PRESSED = 0x00004000; 1651 1652 /** {@hide} */ 1653 static final int DRAWING_CACHE_VALID = 0x00008000; 1654 /** 1655 * Flag used to indicate that this view should be drawn once more (and only once 1656 * more) after its animation has completed. 1657 * {@hide} 1658 */ 1659 static final int ANIMATION_STARTED = 0x00010000; 1660 1661 private static final int SAVE_STATE_CALLED = 0x00020000; 1662 1663 /** 1664 * Indicates that the View returned true when onSetAlpha() was called and that 1665 * the alpha must be restored. 1666 * {@hide} 1667 */ 1668 static final int ALPHA_SET = 0x00040000; 1669 1670 /** 1671 * Set by {@link #setScrollContainer(boolean)}. 1672 */ 1673 static final int SCROLL_CONTAINER = 0x00080000; 1674 1675 /** 1676 * Set by {@link #setScrollContainer(boolean)}. 1677 */ 1678 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1679 1680 /** 1681 * View flag indicating whether this view was invalidated (fully or partially.) 1682 * 1683 * @hide 1684 */ 1685 static final int DIRTY = 0x00200000; 1686 1687 /** 1688 * View flag indicating whether this view was invalidated by an opaque 1689 * invalidate request. 1690 * 1691 * @hide 1692 */ 1693 static final int DIRTY_OPAQUE = 0x00400000; 1694 1695 /** 1696 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1697 * 1698 * @hide 1699 */ 1700 static final int DIRTY_MASK = 0x00600000; 1701 1702 /** 1703 * Indicates whether the background is opaque. 1704 * 1705 * @hide 1706 */ 1707 static final int OPAQUE_BACKGROUND = 0x00800000; 1708 1709 /** 1710 * Indicates whether the scrollbars are opaque. 1711 * 1712 * @hide 1713 */ 1714 static final int OPAQUE_SCROLLBARS = 0x01000000; 1715 1716 /** 1717 * Indicates whether the view is opaque. 1718 * 1719 * @hide 1720 */ 1721 static final int OPAQUE_MASK = 0x01800000; 1722 1723 /** 1724 * Indicates a prepressed state; 1725 * the short time between ACTION_DOWN and recognizing 1726 * a 'real' press. Prepressed is used to recognize quick taps 1727 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1728 * 1729 * @hide 1730 */ 1731 private static final int PREPRESSED = 0x02000000; 1732 1733 /** 1734 * Indicates whether the view is temporarily detached. 1735 * 1736 * @hide 1737 */ 1738 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1739 1740 /** 1741 * Indicates that we should awaken scroll bars once attached 1742 * 1743 * @hide 1744 */ 1745 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1746 1747 /** 1748 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1749 * @hide 1750 */ 1751 private static final int HOVERED = 0x10000000; 1752 1753 /** 1754 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1755 * for transform operations 1756 * 1757 * @hide 1758 */ 1759 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1760 1761 /** {@hide} */ 1762 static final int ACTIVATED = 0x40000000; 1763 1764 /** 1765 * Indicates that this view was specifically invalidated, not just dirtied because some 1766 * child view was invalidated. The flag is used to determine when we need to recreate 1767 * a view's display list (as opposed to just returning a reference to its existing 1768 * display list). 1769 * 1770 * @hide 1771 */ 1772 static final int INVALIDATED = 0x80000000; 1773 1774 /* Masks for mPrivateFlags2 */ 1775 1776 /** 1777 * Indicates that this view has reported that it can accept the current drag's content. 1778 * Cleared when the drag operation concludes. 1779 * @hide 1780 */ 1781 static final int DRAG_CAN_ACCEPT = 0x00000001; 1782 1783 /** 1784 * Indicates that this view is currently directly under the drag location in a 1785 * drag-and-drop operation involving content that it can accept. Cleared when 1786 * the drag exits the view, or when the drag operation concludes. 1787 * @hide 1788 */ 1789 static final int DRAG_HOVERED = 0x00000002; 1790 1791 /** 1792 * Horizontal layout direction of this view is from Left to Right. 1793 * Use with {@link #setLayoutDirection}. 1794 */ 1795 public static final int LAYOUT_DIRECTION_LTR = 0; 1796 1797 /** 1798 * Horizontal layout direction of this view is from Right to Left. 1799 * Use with {@link #setLayoutDirection}. 1800 */ 1801 public static final int LAYOUT_DIRECTION_RTL = 1; 1802 1803 /** 1804 * Horizontal layout direction of this view is inherited from its parent. 1805 * Use with {@link #setLayoutDirection}. 1806 */ 1807 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1808 1809 /** 1810 * Horizontal layout direction of this view is from deduced from the default language 1811 * script for the locale. Use with {@link #setLayoutDirection}. 1812 */ 1813 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /** 1828 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1829 * right-to-left direction. 1830 * @hide 1831 */ 1832 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1833 1834 /** 1835 * Indicates whether the view horizontal layout direction has been resolved. 1836 * @hide 1837 */ 1838 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1842 * @hide 1843 */ 1844 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /* 1847 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1848 * flag value. 1849 * @hide 1850 */ 1851 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1852 LAYOUT_DIRECTION_LTR, 1853 LAYOUT_DIRECTION_RTL, 1854 LAYOUT_DIRECTION_INHERIT, 1855 LAYOUT_DIRECTION_LOCALE 1856 }; 1857 1858 /** 1859 * Default horizontal layout direction. 1860 * @hide 1861 */ 1862 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1863 1864 /** 1865 * Indicates that the view is tracking some sort of transient state 1866 * that the app should not need to be aware of, but that the framework 1867 * should take special care to preserve. 1868 * 1869 * @hide 1870 */ 1871 static final int HAS_TRANSIENT_STATE = 0x00000100; 1872 1873 1874 /** 1875 * Text direction is inherited thru {@link ViewGroup} 1876 */ 1877 public static final int TEXT_DIRECTION_INHERIT = 0; 1878 1879 /** 1880 * Text direction is using "first strong algorithm". The first strong directional character 1881 * determines the paragraph direction. If there is no strong directional character, the 1882 * paragraph direction is the view's resolved layout direction. 1883 */ 1884 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1885 1886 /** 1887 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1888 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1889 * If there are neither, the paragraph direction is the view's resolved layout direction. 1890 */ 1891 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1892 1893 /** 1894 * Text direction is forced to LTR. 1895 */ 1896 public static final int TEXT_DIRECTION_LTR = 3; 1897 1898 /** 1899 * Text direction is forced to RTL. 1900 */ 1901 public static final int TEXT_DIRECTION_RTL = 4; 1902 1903 /** 1904 * Text direction is coming from the system Locale. 1905 */ 1906 public static final int TEXT_DIRECTION_LOCALE = 5; 1907 1908 /** 1909 * Default text direction is inherited 1910 */ 1911 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1912 1913 /** 1914 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1915 * @hide 1916 */ 1917 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1918 1919 /** 1920 * Mask for use with private flags indicating bits used for text direction. 1921 * @hide 1922 */ 1923 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1924 1925 /** 1926 * Array of text direction flags for mapping attribute "textDirection" to correct 1927 * flag value. 1928 * @hide 1929 */ 1930 private static final int[] TEXT_DIRECTION_FLAGS = { 1931 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1932 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1933 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1934 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1935 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1936 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1937 }; 1938 1939 /** 1940 * Indicates whether the view text direction has been resolved. 1941 * @hide 1942 */ 1943 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1944 1945 /** 1946 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1947 * @hide 1948 */ 1949 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1950 1951 /** 1952 * Mask for use with private flags indicating bits used for resolved text direction. 1953 * @hide 1954 */ 1955 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1956 1957 /** 1958 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1959 * @hide 1960 */ 1961 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1962 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /* 1965 * Default text alignment. The text alignment of this View is inherited from its parent. 1966 * Use with {@link #setTextAlignment(int)} 1967 */ 1968 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1969 1970 /** 1971 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1972 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1973 * 1974 * Use with {@link #setTextAlignment(int)} 1975 */ 1976 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1977 1978 /** 1979 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1980 * 1981 * Use with {@link #setTextAlignment(int)} 1982 */ 1983 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1984 1985 /** 1986 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1987 * 1988 * Use with {@link #setTextAlignment(int)} 1989 */ 1990 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1991 1992 /** 1993 * Center the paragraph, e.g. ALIGN_CENTER. 1994 * 1995 * Use with {@link #setTextAlignment(int)} 1996 */ 1997 public static final int TEXT_ALIGNMENT_CENTER = 4; 1998 1999 /** 2000 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2001 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2002 * 2003 * Use with {@link #setTextAlignment(int)} 2004 */ 2005 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2006 2007 /** 2008 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2009 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2010 * 2011 * Use with {@link #setTextAlignment(int)} 2012 */ 2013 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2014 2015 /** 2016 * Default text alignment is inherited 2017 */ 2018 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2019 2020 /** 2021 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2022 * @hide 2023 */ 2024 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2025 2026 /** 2027 * Mask for use with private flags indicating bits used for text alignment. 2028 * @hide 2029 */ 2030 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2031 2032 /** 2033 * Array of text direction flags for mapping attribute "textAlignment" to correct 2034 * flag value. 2035 * @hide 2036 */ 2037 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2038 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2039 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2040 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2041 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2042 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2043 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2044 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2045 }; 2046 2047 /** 2048 * Indicates whether the view text alignment has been resolved. 2049 * @hide 2050 */ 2051 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2052 2053 /** 2054 * Bit shift to get the resolved text alignment. 2055 * @hide 2056 */ 2057 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2058 2059 /** 2060 * Mask for use with private flags indicating bits used for text alignment. 2061 * @hide 2062 */ 2063 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2064 2065 /** 2066 * Indicates whether if the view text alignment has been resolved to gravity 2067 */ 2068 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2069 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2070 2071 // Accessiblity constants for mPrivateFlags2 2072 2073 /** 2074 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2075 */ 2076 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2077 2078 /** 2079 * Automatically determine whether a view is important for accessibility. 2080 */ 2081 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2082 2083 /** 2084 * The view is important for accessibility. 2085 */ 2086 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2087 2088 /** 2089 * The view is not important for accessibility. 2090 */ 2091 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2092 2093 /** 2094 * The default whether the view is important for accessiblity. 2095 */ 2096 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2097 2098 /** 2099 * Mask for obtainig the bits which specify how to determine 2100 * whether a view is important for accessibility. 2101 */ 2102 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2103 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2104 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2105 2106 /** 2107 * Flag indicating whether a view has accessibility focus. 2108 */ 2109 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2110 2111 /** 2112 * Flag indicating whether a view state for accessibility has changed. 2113 */ 2114 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2115 2116 /** 2117 * Flag indicating that view has an animation set on it. This is used to track whether an 2118 * animation is cleared between successive frames, in order to tell the associated 2119 * DisplayList to clear its animation matrix. 2120 */ 2121 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x10000000; 2122 2123 /** 2124 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2125 * is used to check whether later changes to the view's transform should invalidate the 2126 * view to force the quickReject test to run again. 2127 */ 2128 static final int VIEW_QUICK_REJECTED = 0x20000000; 2129 2130 /* End of masks for mPrivateFlags2 */ 2131 2132 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2133 2134 /** 2135 * Always allow a user to over-scroll this view, provided it is a 2136 * view that can scroll. 2137 * 2138 * @see #getOverScrollMode() 2139 * @see #setOverScrollMode(int) 2140 */ 2141 public static final int OVER_SCROLL_ALWAYS = 0; 2142 2143 /** 2144 * Allow a user to over-scroll this view only if the content is large 2145 * enough to meaningfully scroll, provided it is a view that can scroll. 2146 * 2147 * @see #getOverScrollMode() 2148 * @see #setOverScrollMode(int) 2149 */ 2150 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2151 2152 /** 2153 * Never allow a user to over-scroll this view. 2154 * 2155 * @see #getOverScrollMode() 2156 * @see #setOverScrollMode(int) 2157 */ 2158 public static final int OVER_SCROLL_NEVER = 2; 2159 2160 /** 2161 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2162 * requested the system UI (status bar) to be visible (the default). 2163 * 2164 * @see #setSystemUiVisibility(int) 2165 */ 2166 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2167 2168 /** 2169 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2170 * system UI to enter an unobtrusive "low profile" mode. 2171 * 2172 * <p>This is for use in games, book readers, video players, or any other 2173 * "immersive" application where the usual system chrome is deemed too distracting. 2174 * 2175 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2176 * 2177 * @see #setSystemUiVisibility(int) 2178 */ 2179 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2180 2181 /** 2182 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2183 * system navigation be temporarily hidden. 2184 * 2185 * <p>This is an even less obtrusive state than that called for by 2186 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2187 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2188 * those to disappear. This is useful (in conjunction with the 2189 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2190 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2191 * window flags) for displaying content using every last pixel on the display. 2192 * 2193 * <p>There is a limitation: because navigation controls are so important, the least user 2194 * interaction will cause them to reappear immediately. When this happens, both 2195 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2196 * so that both elements reappear at the same time. 2197 * 2198 * @see #setSystemUiVisibility(int) 2199 */ 2200 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2201 2202 /** 2203 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2204 * into the normal fullscreen mode so that its content can take over the screen 2205 * while still allowing the user to interact with the application. 2206 * 2207 * <p>This has the same visual effect as 2208 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2209 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2210 * meaning that non-critical screen decorations (such as the status bar) will be 2211 * hidden while the user is in the View's window, focusing the experience on 2212 * that content. Unlike the window flag, if you are using ActionBar in 2213 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2214 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2215 * hide the action bar. 2216 * 2217 * <p>This approach to going fullscreen is best used over the window flag when 2218 * it is a transient state -- that is, the application does this at certain 2219 * points in its user interaction where it wants to allow the user to focus 2220 * on content, but not as a continuous state. For situations where the application 2221 * would like to simply stay full screen the entire time (such as a game that 2222 * wants to take over the screen), the 2223 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2224 * is usually a better approach. The state set here will be removed by the system 2225 * in various situations (such as the user moving to another application) like 2226 * the other system UI states. 2227 * 2228 * <p>When using this flag, the application should provide some easy facility 2229 * for the user to go out of it. A common example would be in an e-book 2230 * reader, where tapping on the screen brings back whatever screen and UI 2231 * decorations that had been hidden while the user was immersed in reading 2232 * the book. 2233 * 2234 * @see #setSystemUiVisibility(int) 2235 */ 2236 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2237 2238 /** 2239 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2240 * flags, we would like a stable view of the content insets given to 2241 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2242 * will always represent the worst case that the application can expect 2243 * as a continuous state. In the stock Android UI this is the space for 2244 * the system bar, nav bar, and status bar, but not more transient elements 2245 * such as an input method. 2246 * 2247 * The stable layout your UI sees is based on the system UI modes you can 2248 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2249 * then you will get a stable layout for changes of the 2250 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2251 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2252 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2253 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2254 * with a stable layout. (Note that you should avoid using 2255 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2256 * 2257 * If you have set the window flag {@ WindowManager.LayoutParams#FLAG_FULLSCREEN} 2258 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2259 * then a hidden status bar will be considered a "stable" state for purposes 2260 * here. This allows your UI to continually hide the status bar, while still 2261 * using the system UI flags to hide the action bar while still retaining 2262 * a stable layout. Note that changing the window fullscreen flag will never 2263 * provide a stable layout for a clean transition. 2264 * 2265 * <p>If you are using ActionBar in 2266 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2267 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2268 * insets it adds to those given to the application. 2269 */ 2270 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2271 2272 /** 2273 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2274 * to be layed out as if it has requested 2275 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2276 * allows it to avoid artifacts when switching in and out of that mode, at 2277 * the expense that some of its user interface may be covered by screen 2278 * decorations when they are shown. You can perform layout of your inner 2279 * UI elements to account for the navagation system UI through the 2280 * {@link #fitSystemWindows(Rect)} method. 2281 */ 2282 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2283 2284 /** 2285 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2286 * to be layed out as if it has requested 2287 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2288 * allows it to avoid artifacts when switching in and out of that mode, at 2289 * the expense that some of its user interface may be covered by screen 2290 * decorations when they are shown. You can perform layout of your inner 2291 * UI elements to account for non-fullscreen system UI through the 2292 * {@link #fitSystemWindows(Rect)} method. 2293 */ 2294 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2295 2296 /** 2297 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2298 */ 2299 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2300 2301 /** 2302 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2303 */ 2304 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2305 2306 /** 2307 * @hide 2308 * 2309 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2310 * out of the public fields to keep the undefined bits out of the developer's way. 2311 * 2312 * Flag to make the status bar not expandable. Unless you also 2313 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2314 */ 2315 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2316 2317 /** 2318 * @hide 2319 * 2320 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2321 * out of the public fields to keep the undefined bits out of the developer's way. 2322 * 2323 * Flag to hide notification icons and scrolling ticker text. 2324 */ 2325 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2326 2327 /** 2328 * @hide 2329 * 2330 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2331 * out of the public fields to keep the undefined bits out of the developer's way. 2332 * 2333 * Flag to disable incoming notification alerts. This will not block 2334 * icons, but it will block sound, vibrating and other visual or aural notifications. 2335 */ 2336 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2337 2338 /** 2339 * @hide 2340 * 2341 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2342 * out of the public fields to keep the undefined bits out of the developer's way. 2343 * 2344 * Flag to hide only the scrolling ticker. Note that 2345 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2346 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2347 */ 2348 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2349 2350 /** 2351 * @hide 2352 * 2353 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2354 * out of the public fields to keep the undefined bits out of the developer's way. 2355 * 2356 * Flag to hide the center system info area. 2357 */ 2358 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2359 2360 /** 2361 * @hide 2362 * 2363 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2364 * out of the public fields to keep the undefined bits out of the developer's way. 2365 * 2366 * Flag to hide only the home button. Don't use this 2367 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2368 */ 2369 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2370 2371 /** 2372 * @hide 2373 * 2374 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2375 * out of the public fields to keep the undefined bits out of the developer's way. 2376 * 2377 * Flag to hide only the back button. Don't use this 2378 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2379 */ 2380 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2381 2382 /** 2383 * @hide 2384 * 2385 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2386 * out of the public fields to keep the undefined bits out of the developer's way. 2387 * 2388 * Flag to hide only the clock. You might use this if your activity has 2389 * its own clock making the status bar's clock redundant. 2390 */ 2391 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2392 2393 /** 2394 * @hide 2395 * 2396 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2397 * out of the public fields to keep the undefined bits out of the developer's way. 2398 * 2399 * Flag to hide only the recent apps button. Don't use this 2400 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2401 */ 2402 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2403 2404 /** 2405 * @hide 2406 */ 2407 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2408 2409 /** 2410 * These are the system UI flags that can be cleared by events outside 2411 * of an application. Currently this is just the ability to tap on the 2412 * screen while hiding the navigation bar to have it return. 2413 * @hide 2414 */ 2415 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2416 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2417 | SYSTEM_UI_FLAG_FULLSCREEN; 2418 2419 /** 2420 * Flags that can impact the layout in relation to system UI. 2421 */ 2422 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2423 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2424 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2425 2426 /** 2427 * Find views that render the specified text. 2428 * 2429 * @see #findViewsWithText(ArrayList, CharSequence, int) 2430 */ 2431 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2432 2433 /** 2434 * Find find views that contain the specified content description. 2435 * 2436 * @see #findViewsWithText(ArrayList, CharSequence, int) 2437 */ 2438 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2439 2440 /** 2441 * Find views that contain {@link AccessibilityNodeProvider}. Such 2442 * a View is a root of virtual view hierarchy and may contain the searched 2443 * text. If this flag is set Views with providers are automatically 2444 * added and it is a responsibility of the client to call the APIs of 2445 * the provider to determine whether the virtual tree rooted at this View 2446 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2447 * represeting the virtual views with this text. 2448 * 2449 * @see #findViewsWithText(ArrayList, CharSequence, int) 2450 * 2451 * @hide 2452 */ 2453 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2454 2455 /** 2456 * Indicates that the screen has changed state and is now off. 2457 * 2458 * @see #onScreenStateChanged(int) 2459 */ 2460 public static final int SCREEN_STATE_OFF = 0x0; 2461 2462 /** 2463 * Indicates that the screen has changed state and is now on. 2464 * 2465 * @see #onScreenStateChanged(int) 2466 */ 2467 public static final int SCREEN_STATE_ON = 0x1; 2468 2469 /** 2470 * Controls the over-scroll mode for this view. 2471 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2472 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2473 * and {@link #OVER_SCROLL_NEVER}. 2474 */ 2475 private int mOverScrollMode; 2476 2477 /** 2478 * The parent this view is attached to. 2479 * {@hide} 2480 * 2481 * @see #getParent() 2482 */ 2483 protected ViewParent mParent; 2484 2485 /** 2486 * {@hide} 2487 */ 2488 AttachInfo mAttachInfo; 2489 2490 /** 2491 * {@hide} 2492 */ 2493 @ViewDebug.ExportedProperty(flagMapping = { 2494 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2495 name = "FORCE_LAYOUT"), 2496 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2497 name = "LAYOUT_REQUIRED"), 2498 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2499 name = "DRAWING_CACHE_INVALID", outputIf = false), 2500 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2501 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2502 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2503 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2504 }) 2505 int mPrivateFlags; 2506 int mPrivateFlags2; 2507 2508 /** 2509 * This view's request for the visibility of the status bar. 2510 * @hide 2511 */ 2512 @ViewDebug.ExportedProperty(flagMapping = { 2513 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2514 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2515 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2516 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2517 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2518 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2519 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2520 equals = SYSTEM_UI_FLAG_VISIBLE, 2521 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2522 }) 2523 int mSystemUiVisibility; 2524 2525 /** 2526 * Reference count for transient state. 2527 * @see #setHasTransientState(boolean) 2528 */ 2529 int mTransientStateCount = 0; 2530 2531 /** 2532 * Count of how many windows this view has been attached to. 2533 */ 2534 int mWindowAttachCount; 2535 2536 /** 2537 * The layout parameters associated with this view and used by the parent 2538 * {@link android.view.ViewGroup} to determine how this view should be 2539 * laid out. 2540 * {@hide} 2541 */ 2542 protected ViewGroup.LayoutParams mLayoutParams; 2543 2544 /** 2545 * The view flags hold various views states. 2546 * {@hide} 2547 */ 2548 @ViewDebug.ExportedProperty 2549 int mViewFlags; 2550 2551 static class TransformationInfo { 2552 /** 2553 * The transform matrix for the View. This transform is calculated internally 2554 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2555 * is used by default. Do *not* use this variable directly; instead call 2556 * getMatrix(), which will automatically recalculate the matrix if necessary 2557 * to get the correct matrix based on the latest rotation and scale properties. 2558 */ 2559 private final Matrix mMatrix = new Matrix(); 2560 2561 /** 2562 * The transform matrix for the View. This transform is calculated internally 2563 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2564 * is used by default. Do *not* use this variable directly; instead call 2565 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2566 * to get the correct matrix based on the latest rotation and scale properties. 2567 */ 2568 private Matrix mInverseMatrix; 2569 2570 /** 2571 * An internal variable that tracks whether we need to recalculate the 2572 * transform matrix, based on whether the rotation or scaleX/Y properties 2573 * have changed since the matrix was last calculated. 2574 */ 2575 boolean mMatrixDirty = false; 2576 2577 /** 2578 * An internal variable that tracks whether we need to recalculate the 2579 * transform matrix, based on whether the rotation or scaleX/Y properties 2580 * have changed since the matrix was last calculated. 2581 */ 2582 private boolean mInverseMatrixDirty = true; 2583 2584 /** 2585 * A variable that tracks whether we need to recalculate the 2586 * transform matrix, based on whether the rotation or scaleX/Y properties 2587 * have changed since the matrix was last calculated. This variable 2588 * is only valid after a call to updateMatrix() or to a function that 2589 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2590 */ 2591 private boolean mMatrixIsIdentity = true; 2592 2593 /** 2594 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2595 */ 2596 private Camera mCamera = null; 2597 2598 /** 2599 * This matrix is used when computing the matrix for 3D rotations. 2600 */ 2601 private Matrix matrix3D = null; 2602 2603 /** 2604 * These prev values are used to recalculate a centered pivot point when necessary. The 2605 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2606 * set), so thes values are only used then as well. 2607 */ 2608 private int mPrevWidth = -1; 2609 private int mPrevHeight = -1; 2610 2611 /** 2612 * The degrees rotation around the vertical axis through the pivot point. 2613 */ 2614 @ViewDebug.ExportedProperty 2615 float mRotationY = 0f; 2616 2617 /** 2618 * The degrees rotation around the horizontal axis through the pivot point. 2619 */ 2620 @ViewDebug.ExportedProperty 2621 float mRotationX = 0f; 2622 2623 /** 2624 * The degrees rotation around the pivot point. 2625 */ 2626 @ViewDebug.ExportedProperty 2627 float mRotation = 0f; 2628 2629 /** 2630 * The amount of translation of the object away from its left property (post-layout). 2631 */ 2632 @ViewDebug.ExportedProperty 2633 float mTranslationX = 0f; 2634 2635 /** 2636 * The amount of translation of the object away from its top property (post-layout). 2637 */ 2638 @ViewDebug.ExportedProperty 2639 float mTranslationY = 0f; 2640 2641 /** 2642 * The amount of scale in the x direction around the pivot point. A 2643 * value of 1 means no scaling is applied. 2644 */ 2645 @ViewDebug.ExportedProperty 2646 float mScaleX = 1f; 2647 2648 /** 2649 * The amount of scale in the y direction around the pivot point. A 2650 * value of 1 means no scaling is applied. 2651 */ 2652 @ViewDebug.ExportedProperty 2653 float mScaleY = 1f; 2654 2655 /** 2656 * The x location of the point around which the view is rotated and scaled. 2657 */ 2658 @ViewDebug.ExportedProperty 2659 float mPivotX = 0f; 2660 2661 /** 2662 * The y location of the point around which the view is rotated and scaled. 2663 */ 2664 @ViewDebug.ExportedProperty 2665 float mPivotY = 0f; 2666 2667 /** 2668 * The opacity of the View. This is a value from 0 to 1, where 0 means 2669 * completely transparent and 1 means completely opaque. 2670 */ 2671 @ViewDebug.ExportedProperty 2672 float mAlpha = 1f; 2673 } 2674 2675 TransformationInfo mTransformationInfo; 2676 2677 private boolean mLastIsOpaque; 2678 2679 /** 2680 * Convenience value to check for float values that are close enough to zero to be considered 2681 * zero. 2682 */ 2683 private static final float NONZERO_EPSILON = .001f; 2684 2685 /** 2686 * The distance in pixels from the left edge of this view's parent 2687 * to the left edge of this view. 2688 * {@hide} 2689 */ 2690 @ViewDebug.ExportedProperty(category = "layout") 2691 protected int mLeft; 2692 /** 2693 * The distance in pixels from the left edge of this view's parent 2694 * to the right edge of this view. 2695 * {@hide} 2696 */ 2697 @ViewDebug.ExportedProperty(category = "layout") 2698 protected int mRight; 2699 /** 2700 * The distance in pixels from the top edge of this view's parent 2701 * to the top edge of this view. 2702 * {@hide} 2703 */ 2704 @ViewDebug.ExportedProperty(category = "layout") 2705 protected int mTop; 2706 /** 2707 * The distance in pixels from the top edge of this view's parent 2708 * to the bottom edge of this view. 2709 * {@hide} 2710 */ 2711 @ViewDebug.ExportedProperty(category = "layout") 2712 protected int mBottom; 2713 2714 /** 2715 * The offset, in pixels, by which the content of this view is scrolled 2716 * horizontally. 2717 * {@hide} 2718 */ 2719 @ViewDebug.ExportedProperty(category = "scrolling") 2720 protected int mScrollX; 2721 /** 2722 * The offset, in pixels, by which the content of this view is scrolled 2723 * vertically. 2724 * {@hide} 2725 */ 2726 @ViewDebug.ExportedProperty(category = "scrolling") 2727 protected int mScrollY; 2728 2729 /** 2730 * The left padding in pixels, that is the distance in pixels between the 2731 * left edge of this view and the left edge of its content. 2732 * {@hide} 2733 */ 2734 @ViewDebug.ExportedProperty(category = "padding") 2735 protected int mPaddingLeft; 2736 /** 2737 * The right padding in pixels, that is the distance in pixels between the 2738 * right edge of this view and the right edge of its content. 2739 * {@hide} 2740 */ 2741 @ViewDebug.ExportedProperty(category = "padding") 2742 protected int mPaddingRight; 2743 /** 2744 * The top padding in pixels, that is the distance in pixels between the 2745 * top edge of this view and the top edge of its content. 2746 * {@hide} 2747 */ 2748 @ViewDebug.ExportedProperty(category = "padding") 2749 protected int mPaddingTop; 2750 /** 2751 * The bottom padding in pixels, that is the distance in pixels between the 2752 * bottom edge of this view and the bottom edge of its content. 2753 * {@hide} 2754 */ 2755 @ViewDebug.ExportedProperty(category = "padding") 2756 protected int mPaddingBottom; 2757 2758 /** 2759 * The layout insets in pixels, that is the distance in pixels between the 2760 * visible edges of this view its bounds. 2761 */ 2762 private Insets mLayoutInsets; 2763 2764 /** 2765 * Briefly describes the view and is primarily used for accessibility support. 2766 */ 2767 private CharSequence mContentDescription; 2768 2769 /** 2770 * Cache the paddingRight set by the user to append to the scrollbar's size. 2771 * 2772 * @hide 2773 */ 2774 @ViewDebug.ExportedProperty(category = "padding") 2775 protected int mUserPaddingRight; 2776 2777 /** 2778 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2779 * 2780 * @hide 2781 */ 2782 @ViewDebug.ExportedProperty(category = "padding") 2783 protected int mUserPaddingBottom; 2784 2785 /** 2786 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2787 * 2788 * @hide 2789 */ 2790 @ViewDebug.ExportedProperty(category = "padding") 2791 protected int mUserPaddingLeft; 2792 2793 /** 2794 * Cache if the user padding is relative. 2795 * 2796 */ 2797 @ViewDebug.ExportedProperty(category = "padding") 2798 boolean mUserPaddingRelative; 2799 2800 /** 2801 * Cache the paddingStart set by the user to append to the scrollbar's size. 2802 * 2803 */ 2804 @ViewDebug.ExportedProperty(category = "padding") 2805 int mUserPaddingStart; 2806 2807 /** 2808 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2809 * 2810 */ 2811 @ViewDebug.ExportedProperty(category = "padding") 2812 int mUserPaddingEnd; 2813 2814 /** 2815 * @hide 2816 */ 2817 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2818 /** 2819 * @hide 2820 */ 2821 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2822 2823 private Drawable mBackground; 2824 2825 private int mBackgroundResource; 2826 private boolean mBackgroundSizeChanged; 2827 2828 static class ListenerInfo { 2829 /** 2830 * Listener used to dispatch focus change events. 2831 * This field should be made private, so it is hidden from the SDK. 2832 * {@hide} 2833 */ 2834 protected OnFocusChangeListener mOnFocusChangeListener; 2835 2836 /** 2837 * Listeners for layout change events. 2838 */ 2839 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2840 2841 /** 2842 * Listeners for attach events. 2843 */ 2844 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2845 2846 /** 2847 * Listener used to dispatch click events. 2848 * This field should be made private, so it is hidden from the SDK. 2849 * {@hide} 2850 */ 2851 public OnClickListener mOnClickListener; 2852 2853 /** 2854 * Listener used to dispatch long click events. 2855 * This field should be made private, so it is hidden from the SDK. 2856 * {@hide} 2857 */ 2858 protected OnLongClickListener mOnLongClickListener; 2859 2860 /** 2861 * Listener used to build the context menu. 2862 * This field should be made private, so it is hidden from the SDK. 2863 * {@hide} 2864 */ 2865 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2866 2867 private OnKeyListener mOnKeyListener; 2868 2869 private OnTouchListener mOnTouchListener; 2870 2871 private OnHoverListener mOnHoverListener; 2872 2873 private OnGenericMotionListener mOnGenericMotionListener; 2874 2875 private OnDragListener mOnDragListener; 2876 2877 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2878 } 2879 2880 ListenerInfo mListenerInfo; 2881 2882 /** 2883 * The application environment this view lives in. 2884 * This field should be made private, so it is hidden from the SDK. 2885 * {@hide} 2886 */ 2887 protected Context mContext; 2888 2889 private final Resources mResources; 2890 2891 private ScrollabilityCache mScrollCache; 2892 2893 private int[] mDrawableState = null; 2894 2895 /** 2896 * Set to true when drawing cache is enabled and cannot be created. 2897 * 2898 * @hide 2899 */ 2900 public boolean mCachingFailed; 2901 2902 private Bitmap mDrawingCache; 2903 private Bitmap mUnscaledDrawingCache; 2904 private HardwareLayer mHardwareLayer; 2905 DisplayList mDisplayList; 2906 2907 /** 2908 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2909 * the user may specify which view to go to next. 2910 */ 2911 private int mNextFocusLeftId = View.NO_ID; 2912 2913 /** 2914 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2915 * the user may specify which view to go to next. 2916 */ 2917 private int mNextFocusRightId = View.NO_ID; 2918 2919 /** 2920 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2921 * the user may specify which view to go to next. 2922 */ 2923 private int mNextFocusUpId = View.NO_ID; 2924 2925 /** 2926 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2927 * the user may specify which view to go to next. 2928 */ 2929 private int mNextFocusDownId = View.NO_ID; 2930 2931 /** 2932 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2933 * the user may specify which view to go to next. 2934 */ 2935 int mNextFocusForwardId = View.NO_ID; 2936 2937 private CheckForLongPress mPendingCheckForLongPress; 2938 private CheckForTap mPendingCheckForTap = null; 2939 private PerformClick mPerformClick; 2940 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2941 2942 private UnsetPressedState mUnsetPressedState; 2943 2944 /** 2945 * Whether the long press's action has been invoked. The tap's action is invoked on the 2946 * up event while a long press is invoked as soon as the long press duration is reached, so 2947 * a long press could be performed before the tap is checked, in which case the tap's action 2948 * should not be invoked. 2949 */ 2950 private boolean mHasPerformedLongPress; 2951 2952 /** 2953 * The minimum height of the view. We'll try our best to have the height 2954 * of this view to at least this amount. 2955 */ 2956 @ViewDebug.ExportedProperty(category = "measurement") 2957 private int mMinHeight; 2958 2959 /** 2960 * The minimum width of the view. We'll try our best to have the width 2961 * of this view to at least this amount. 2962 */ 2963 @ViewDebug.ExportedProperty(category = "measurement") 2964 private int mMinWidth; 2965 2966 /** 2967 * The delegate to handle touch events that are physically in this view 2968 * but should be handled by another view. 2969 */ 2970 private TouchDelegate mTouchDelegate = null; 2971 2972 /** 2973 * Solid color to use as a background when creating the drawing cache. Enables 2974 * the cache to use 16 bit bitmaps instead of 32 bit. 2975 */ 2976 private int mDrawingCacheBackgroundColor = 0; 2977 2978 /** 2979 * Special tree observer used when mAttachInfo is null. 2980 */ 2981 private ViewTreeObserver mFloatingTreeObserver; 2982 2983 /** 2984 * Cache the touch slop from the context that created the view. 2985 */ 2986 private int mTouchSlop; 2987 2988 /** 2989 * Object that handles automatic animation of view properties. 2990 */ 2991 private ViewPropertyAnimator mAnimator = null; 2992 2993 /** 2994 * Flag indicating that a drag can cross window boundaries. When 2995 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2996 * with this flag set, all visible applications will be able to participate 2997 * in the drag operation and receive the dragged content. 2998 * 2999 * @hide 3000 */ 3001 public static final int DRAG_FLAG_GLOBAL = 1; 3002 3003 /** 3004 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3005 */ 3006 private float mVerticalScrollFactor; 3007 3008 /** 3009 * Position of the vertical scroll bar. 3010 */ 3011 private int mVerticalScrollbarPosition; 3012 3013 /** 3014 * Position the scroll bar at the default position as determined by the system. 3015 */ 3016 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3017 3018 /** 3019 * Position the scroll bar along the left edge. 3020 */ 3021 public static final int SCROLLBAR_POSITION_LEFT = 1; 3022 3023 /** 3024 * Position the scroll bar along the right edge. 3025 */ 3026 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3027 3028 /** 3029 * Indicates that the view does not have a layer. 3030 * 3031 * @see #getLayerType() 3032 * @see #setLayerType(int, android.graphics.Paint) 3033 * @see #LAYER_TYPE_SOFTWARE 3034 * @see #LAYER_TYPE_HARDWARE 3035 */ 3036 public static final int LAYER_TYPE_NONE = 0; 3037 3038 /** 3039 * <p>Indicates that the view has a software layer. A software layer is backed 3040 * by a bitmap and causes the view to be rendered using Android's software 3041 * rendering pipeline, even if hardware acceleration is enabled.</p> 3042 * 3043 * <p>Software layers have various usages:</p> 3044 * <p>When the application is not using hardware acceleration, a software layer 3045 * is useful to apply a specific color filter and/or blending mode and/or 3046 * translucency to a view and all its children.</p> 3047 * <p>When the application is using hardware acceleration, a software layer 3048 * is useful to render drawing primitives not supported by the hardware 3049 * accelerated pipeline. It can also be used to cache a complex view tree 3050 * into a texture and reduce the complexity of drawing operations. For instance, 3051 * when animating a complex view tree with a translation, a software layer can 3052 * be used to render the view tree only once.</p> 3053 * <p>Software layers should be avoided when the affected view tree updates 3054 * often. Every update will require to re-render the software layer, which can 3055 * potentially be slow (particularly when hardware acceleration is turned on 3056 * since the layer will have to be uploaded into a hardware texture after every 3057 * update.)</p> 3058 * 3059 * @see #getLayerType() 3060 * @see #setLayerType(int, android.graphics.Paint) 3061 * @see #LAYER_TYPE_NONE 3062 * @see #LAYER_TYPE_HARDWARE 3063 */ 3064 public static final int LAYER_TYPE_SOFTWARE = 1; 3065 3066 /** 3067 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3068 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3069 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3070 * rendering pipeline, but only if hardware acceleration is turned on for the 3071 * view hierarchy. When hardware acceleration is turned off, hardware layers 3072 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3073 * 3074 * <p>A hardware layer is useful to apply a specific color filter and/or 3075 * blending mode and/or translucency to a view and all its children.</p> 3076 * <p>A hardware layer can be used to cache a complex view tree into a 3077 * texture and reduce the complexity of drawing operations. For instance, 3078 * when animating a complex view tree with a translation, a hardware layer can 3079 * be used to render the view tree only once.</p> 3080 * <p>A hardware layer can also be used to increase the rendering quality when 3081 * rotation transformations are applied on a view. It can also be used to 3082 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3083 * 3084 * @see #getLayerType() 3085 * @see #setLayerType(int, android.graphics.Paint) 3086 * @see #LAYER_TYPE_NONE 3087 * @see #LAYER_TYPE_SOFTWARE 3088 */ 3089 public static final int LAYER_TYPE_HARDWARE = 2; 3090 3091 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3092 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3093 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3094 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3095 }) 3096 int mLayerType = LAYER_TYPE_NONE; 3097 Paint mLayerPaint; 3098 Rect mLocalDirtyRect; 3099 3100 /** 3101 * Set to true when the view is sending hover accessibility events because it 3102 * is the innermost hovered view. 3103 */ 3104 private boolean mSendingHoverAccessibilityEvents; 3105 3106 /** 3107 * Simple constructor to use when creating a view from code. 3108 * 3109 * @param context The Context the view is running in, through which it can 3110 * access the current theme, resources, etc. 3111 */ 3112 public View(Context context) { 3113 mContext = context; 3114 mResources = context != null ? context.getResources() : null; 3115 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3116 // Set layout and text direction defaults 3117 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3118 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3119 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3120 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3121 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3122 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3123 mUserPaddingStart = -1; 3124 mUserPaddingEnd = -1; 3125 mUserPaddingRelative = false; 3126 } 3127 3128 /** 3129 * Delegate for injecting accessiblity functionality. 3130 */ 3131 AccessibilityDelegate mAccessibilityDelegate; 3132 3133 /** 3134 * Consistency verifier for debugging purposes. 3135 * @hide 3136 */ 3137 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3138 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3139 new InputEventConsistencyVerifier(this, 0) : null; 3140 3141 /** 3142 * Constructor that is called when inflating a view from XML. This is called 3143 * when a view is being constructed from an XML file, supplying attributes 3144 * that were specified in the XML file. This version uses a default style of 3145 * 0, so the only attribute values applied are those in the Context's Theme 3146 * and the given AttributeSet. 3147 * 3148 * <p> 3149 * The method onFinishInflate() will be called after all children have been 3150 * added. 3151 * 3152 * @param context The Context the view is running in, through which it can 3153 * access the current theme, resources, etc. 3154 * @param attrs The attributes of the XML tag that is inflating the view. 3155 * @see #View(Context, AttributeSet, int) 3156 */ 3157 public View(Context context, AttributeSet attrs) { 3158 this(context, attrs, 0); 3159 } 3160 3161 /** 3162 * Perform inflation from XML and apply a class-specific base style. This 3163 * constructor of View allows subclasses to use their own base style when 3164 * they are inflating. For example, a Button class's constructor would call 3165 * this version of the super class constructor and supply 3166 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3167 * the theme's button style to modify all of the base view attributes (in 3168 * particular its background) as well as the Button class's attributes. 3169 * 3170 * @param context The Context the view is running in, through which it can 3171 * access the current theme, resources, etc. 3172 * @param attrs The attributes of the XML tag that is inflating the view. 3173 * @param defStyle The default style to apply to this view. If 0, no style 3174 * will be applied (beyond what is included in the theme). This may 3175 * either be an attribute resource, whose value will be retrieved 3176 * from the current theme, or an explicit style resource. 3177 * @see #View(Context, AttributeSet) 3178 */ 3179 public View(Context context, AttributeSet attrs, int defStyle) { 3180 this(context); 3181 3182 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3183 defStyle, 0); 3184 3185 Drawable background = null; 3186 3187 int leftPadding = -1; 3188 int topPadding = -1; 3189 int rightPadding = -1; 3190 int bottomPadding = -1; 3191 int startPadding = -1; 3192 int endPadding = -1; 3193 3194 int padding = -1; 3195 3196 int viewFlagValues = 0; 3197 int viewFlagMasks = 0; 3198 3199 boolean setScrollContainer = false; 3200 3201 int x = 0; 3202 int y = 0; 3203 3204 float tx = 0; 3205 float ty = 0; 3206 float rotation = 0; 3207 float rotationX = 0; 3208 float rotationY = 0; 3209 float sx = 1f; 3210 float sy = 1f; 3211 boolean transformSet = false; 3212 3213 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3214 3215 int overScrollMode = mOverScrollMode; 3216 final int N = a.getIndexCount(); 3217 for (int i = 0; i < N; i++) { 3218 int attr = a.getIndex(i); 3219 switch (attr) { 3220 case com.android.internal.R.styleable.View_background: 3221 background = a.getDrawable(attr); 3222 break; 3223 case com.android.internal.R.styleable.View_padding: 3224 padding = a.getDimensionPixelSize(attr, -1); 3225 break; 3226 case com.android.internal.R.styleable.View_paddingLeft: 3227 leftPadding = a.getDimensionPixelSize(attr, -1); 3228 break; 3229 case com.android.internal.R.styleable.View_paddingTop: 3230 topPadding = a.getDimensionPixelSize(attr, -1); 3231 break; 3232 case com.android.internal.R.styleable.View_paddingRight: 3233 rightPadding = a.getDimensionPixelSize(attr, -1); 3234 break; 3235 case com.android.internal.R.styleable.View_paddingBottom: 3236 bottomPadding = a.getDimensionPixelSize(attr, -1); 3237 break; 3238 case com.android.internal.R.styleable.View_paddingStart: 3239 startPadding = a.getDimensionPixelSize(attr, -1); 3240 break; 3241 case com.android.internal.R.styleable.View_paddingEnd: 3242 endPadding = a.getDimensionPixelSize(attr, -1); 3243 break; 3244 case com.android.internal.R.styleable.View_scrollX: 3245 x = a.getDimensionPixelOffset(attr, 0); 3246 break; 3247 case com.android.internal.R.styleable.View_scrollY: 3248 y = a.getDimensionPixelOffset(attr, 0); 3249 break; 3250 case com.android.internal.R.styleable.View_alpha: 3251 setAlpha(a.getFloat(attr, 1f)); 3252 break; 3253 case com.android.internal.R.styleable.View_transformPivotX: 3254 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3255 break; 3256 case com.android.internal.R.styleable.View_transformPivotY: 3257 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3258 break; 3259 case com.android.internal.R.styleable.View_translationX: 3260 tx = a.getDimensionPixelOffset(attr, 0); 3261 transformSet = true; 3262 break; 3263 case com.android.internal.R.styleable.View_translationY: 3264 ty = a.getDimensionPixelOffset(attr, 0); 3265 transformSet = true; 3266 break; 3267 case com.android.internal.R.styleable.View_rotation: 3268 rotation = a.getFloat(attr, 0); 3269 transformSet = true; 3270 break; 3271 case com.android.internal.R.styleable.View_rotationX: 3272 rotationX = a.getFloat(attr, 0); 3273 transformSet = true; 3274 break; 3275 case com.android.internal.R.styleable.View_rotationY: 3276 rotationY = a.getFloat(attr, 0); 3277 transformSet = true; 3278 break; 3279 case com.android.internal.R.styleable.View_scaleX: 3280 sx = a.getFloat(attr, 1f); 3281 transformSet = true; 3282 break; 3283 case com.android.internal.R.styleable.View_scaleY: 3284 sy = a.getFloat(attr, 1f); 3285 transformSet = true; 3286 break; 3287 case com.android.internal.R.styleable.View_id: 3288 mID = a.getResourceId(attr, NO_ID); 3289 break; 3290 case com.android.internal.R.styleable.View_tag: 3291 mTag = a.getText(attr); 3292 break; 3293 case com.android.internal.R.styleable.View_fitsSystemWindows: 3294 if (a.getBoolean(attr, false)) { 3295 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3296 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3297 } 3298 break; 3299 case com.android.internal.R.styleable.View_focusable: 3300 if (a.getBoolean(attr, false)) { 3301 viewFlagValues |= FOCUSABLE; 3302 viewFlagMasks |= FOCUSABLE_MASK; 3303 } 3304 break; 3305 case com.android.internal.R.styleable.View_focusableInTouchMode: 3306 if (a.getBoolean(attr, false)) { 3307 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3308 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3309 } 3310 break; 3311 case com.android.internal.R.styleable.View_clickable: 3312 if (a.getBoolean(attr, false)) { 3313 viewFlagValues |= CLICKABLE; 3314 viewFlagMasks |= CLICKABLE; 3315 } 3316 break; 3317 case com.android.internal.R.styleable.View_longClickable: 3318 if (a.getBoolean(attr, false)) { 3319 viewFlagValues |= LONG_CLICKABLE; 3320 viewFlagMasks |= LONG_CLICKABLE; 3321 } 3322 break; 3323 case com.android.internal.R.styleable.View_saveEnabled: 3324 if (!a.getBoolean(attr, true)) { 3325 viewFlagValues |= SAVE_DISABLED; 3326 viewFlagMasks |= SAVE_DISABLED_MASK; 3327 } 3328 break; 3329 case com.android.internal.R.styleable.View_duplicateParentState: 3330 if (a.getBoolean(attr, false)) { 3331 viewFlagValues |= DUPLICATE_PARENT_STATE; 3332 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3333 } 3334 break; 3335 case com.android.internal.R.styleable.View_visibility: 3336 final int visibility = a.getInt(attr, 0); 3337 if (visibility != 0) { 3338 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3339 viewFlagMasks |= VISIBILITY_MASK; 3340 } 3341 break; 3342 case com.android.internal.R.styleable.View_layoutDirection: 3343 // Clear any layout direction flags (included resolved bits) already set 3344 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3345 // Set the layout direction flags depending on the value of the attribute 3346 final int layoutDirection = a.getInt(attr, -1); 3347 final int value = (layoutDirection != -1) ? 3348 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3349 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3350 break; 3351 case com.android.internal.R.styleable.View_drawingCacheQuality: 3352 final int cacheQuality = a.getInt(attr, 0); 3353 if (cacheQuality != 0) { 3354 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3355 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3356 } 3357 break; 3358 case com.android.internal.R.styleable.View_contentDescription: 3359 mContentDescription = a.getString(attr); 3360 break; 3361 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3362 if (!a.getBoolean(attr, true)) { 3363 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3364 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3365 } 3366 break; 3367 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3368 if (!a.getBoolean(attr, true)) { 3369 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3370 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3371 } 3372 break; 3373 case R.styleable.View_scrollbars: 3374 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3375 if (scrollbars != SCROLLBARS_NONE) { 3376 viewFlagValues |= scrollbars; 3377 viewFlagMasks |= SCROLLBARS_MASK; 3378 initializeScrollbars(a); 3379 } 3380 break; 3381 //noinspection deprecation 3382 case R.styleable.View_fadingEdge: 3383 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3384 // Ignore the attribute starting with ICS 3385 break; 3386 } 3387 // With builds < ICS, fall through and apply fading edges 3388 case R.styleable.View_requiresFadingEdge: 3389 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3390 if (fadingEdge != FADING_EDGE_NONE) { 3391 viewFlagValues |= fadingEdge; 3392 viewFlagMasks |= FADING_EDGE_MASK; 3393 initializeFadingEdge(a); 3394 } 3395 break; 3396 case R.styleable.View_scrollbarStyle: 3397 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3398 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3399 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3400 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3401 } 3402 break; 3403 case R.styleable.View_isScrollContainer: 3404 setScrollContainer = true; 3405 if (a.getBoolean(attr, false)) { 3406 setScrollContainer(true); 3407 } 3408 break; 3409 case com.android.internal.R.styleable.View_keepScreenOn: 3410 if (a.getBoolean(attr, false)) { 3411 viewFlagValues |= KEEP_SCREEN_ON; 3412 viewFlagMasks |= KEEP_SCREEN_ON; 3413 } 3414 break; 3415 case R.styleable.View_filterTouchesWhenObscured: 3416 if (a.getBoolean(attr, false)) { 3417 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3418 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3419 } 3420 break; 3421 case R.styleable.View_nextFocusLeft: 3422 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3423 break; 3424 case R.styleable.View_nextFocusRight: 3425 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3426 break; 3427 case R.styleable.View_nextFocusUp: 3428 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3429 break; 3430 case R.styleable.View_nextFocusDown: 3431 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3432 break; 3433 case R.styleable.View_nextFocusForward: 3434 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3435 break; 3436 case R.styleable.View_minWidth: 3437 mMinWidth = a.getDimensionPixelSize(attr, 0); 3438 break; 3439 case R.styleable.View_minHeight: 3440 mMinHeight = a.getDimensionPixelSize(attr, 0); 3441 break; 3442 case R.styleable.View_onClick: 3443 if (context.isRestricted()) { 3444 throw new IllegalStateException("The android:onClick attribute cannot " 3445 + "be used within a restricted context"); 3446 } 3447 3448 final String handlerName = a.getString(attr); 3449 if (handlerName != null) { 3450 setOnClickListener(new OnClickListener() { 3451 private Method mHandler; 3452 3453 public void onClick(View v) { 3454 if (mHandler == null) { 3455 try { 3456 mHandler = getContext().getClass().getMethod(handlerName, 3457 View.class); 3458 } catch (NoSuchMethodException e) { 3459 int id = getId(); 3460 String idText = id == NO_ID ? "" : " with id '" 3461 + getContext().getResources().getResourceEntryName( 3462 id) + "'"; 3463 throw new IllegalStateException("Could not find a method " + 3464 handlerName + "(View) in the activity " 3465 + getContext().getClass() + " for onClick handler" 3466 + " on view " + View.this.getClass() + idText, e); 3467 } 3468 } 3469 3470 try { 3471 mHandler.invoke(getContext(), View.this); 3472 } catch (IllegalAccessException e) { 3473 throw new IllegalStateException("Could not execute non " 3474 + "public method of the activity", e); 3475 } catch (InvocationTargetException e) { 3476 throw new IllegalStateException("Could not execute " 3477 + "method of the activity", e); 3478 } 3479 } 3480 }); 3481 } 3482 break; 3483 case R.styleable.View_overScrollMode: 3484 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3485 break; 3486 case R.styleable.View_verticalScrollbarPosition: 3487 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3488 break; 3489 case R.styleable.View_layerType: 3490 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3491 break; 3492 case R.styleable.View_textDirection: 3493 // Clear any text direction flag already set 3494 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3495 // Set the text direction flags depending on the value of the attribute 3496 final int textDirection = a.getInt(attr, -1); 3497 if (textDirection != -1) { 3498 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3499 } 3500 break; 3501 case R.styleable.View_textAlignment: 3502 // Clear any text alignment flag already set 3503 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3504 // Set the text alignment flag depending on the value of the attribute 3505 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3506 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3507 break; 3508 case R.styleable.View_importantForAccessibility: 3509 setImportantForAccessibility(a.getInt(attr, 3510 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3511 } 3512 } 3513 3514 a.recycle(); 3515 3516 setOverScrollMode(overScrollMode); 3517 3518 if (background != null) { 3519 setBackground(background); 3520 } 3521 3522 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3523 // layout direction). Those cached values will be used later during padding resolution. 3524 mUserPaddingStart = startPadding; 3525 mUserPaddingEnd = endPadding; 3526 3527 updateUserPaddingRelative(); 3528 3529 if (padding >= 0) { 3530 leftPadding = padding; 3531 topPadding = padding; 3532 rightPadding = padding; 3533 bottomPadding = padding; 3534 } 3535 3536 // If the user specified the padding (either with android:padding or 3537 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3538 // use the default padding or the padding from the background drawable 3539 // (stored at this point in mPadding*) 3540 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3541 topPadding >= 0 ? topPadding : mPaddingTop, 3542 rightPadding >= 0 ? rightPadding : mPaddingRight, 3543 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3544 3545 if (viewFlagMasks != 0) { 3546 setFlags(viewFlagValues, viewFlagMasks); 3547 } 3548 3549 // Needs to be called after mViewFlags is set 3550 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3551 recomputePadding(); 3552 } 3553 3554 if (x != 0 || y != 0) { 3555 scrollTo(x, y); 3556 } 3557 3558 if (transformSet) { 3559 setTranslationX(tx); 3560 setTranslationY(ty); 3561 setRotation(rotation); 3562 setRotationX(rotationX); 3563 setRotationY(rotationY); 3564 setScaleX(sx); 3565 setScaleY(sy); 3566 } 3567 3568 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3569 setScrollContainer(true); 3570 } 3571 3572 computeOpaqueFlags(); 3573 } 3574 3575 private void updateUserPaddingRelative() { 3576 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3577 } 3578 3579 /** 3580 * Non-public constructor for use in testing 3581 */ 3582 View() { 3583 mResources = null; 3584 } 3585 3586 /** 3587 * <p> 3588 * Initializes the fading edges from a given set of styled attributes. This 3589 * method should be called by subclasses that need fading edges and when an 3590 * instance of these subclasses is created programmatically rather than 3591 * being inflated from XML. This method is automatically called when the XML 3592 * is inflated. 3593 * </p> 3594 * 3595 * @param a the styled attributes set to initialize the fading edges from 3596 */ 3597 protected void initializeFadingEdge(TypedArray a) { 3598 initScrollCache(); 3599 3600 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3601 R.styleable.View_fadingEdgeLength, 3602 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3603 } 3604 3605 /** 3606 * Returns the size of the vertical faded edges used to indicate that more 3607 * content in this view is visible. 3608 * 3609 * @return The size in pixels of the vertical faded edge or 0 if vertical 3610 * faded edges are not enabled for this view. 3611 * @attr ref android.R.styleable#View_fadingEdgeLength 3612 */ 3613 public int getVerticalFadingEdgeLength() { 3614 if (isVerticalFadingEdgeEnabled()) { 3615 ScrollabilityCache cache = mScrollCache; 3616 if (cache != null) { 3617 return cache.fadingEdgeLength; 3618 } 3619 } 3620 return 0; 3621 } 3622 3623 /** 3624 * Set the size of the faded edge used to indicate that more content in this 3625 * view is available. Will not change whether the fading edge is enabled; use 3626 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3627 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3628 * for the vertical or horizontal fading edges. 3629 * 3630 * @param length The size in pixels of the faded edge used to indicate that more 3631 * content in this view is visible. 3632 */ 3633 public void setFadingEdgeLength(int length) { 3634 initScrollCache(); 3635 mScrollCache.fadingEdgeLength = length; 3636 } 3637 3638 /** 3639 * Returns the size of the horizontal faded edges used to indicate that more 3640 * content in this view is visible. 3641 * 3642 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3643 * faded edges are not enabled for this view. 3644 * @attr ref android.R.styleable#View_fadingEdgeLength 3645 */ 3646 public int getHorizontalFadingEdgeLength() { 3647 if (isHorizontalFadingEdgeEnabled()) { 3648 ScrollabilityCache cache = mScrollCache; 3649 if (cache != null) { 3650 return cache.fadingEdgeLength; 3651 } 3652 } 3653 return 0; 3654 } 3655 3656 /** 3657 * Returns the width of the vertical scrollbar. 3658 * 3659 * @return The width in pixels of the vertical scrollbar or 0 if there 3660 * is no vertical scrollbar. 3661 */ 3662 public int getVerticalScrollbarWidth() { 3663 ScrollabilityCache cache = mScrollCache; 3664 if (cache != null) { 3665 ScrollBarDrawable scrollBar = cache.scrollBar; 3666 if (scrollBar != null) { 3667 int size = scrollBar.getSize(true); 3668 if (size <= 0) { 3669 size = cache.scrollBarSize; 3670 } 3671 return size; 3672 } 3673 return 0; 3674 } 3675 return 0; 3676 } 3677 3678 /** 3679 * Returns the height of the horizontal scrollbar. 3680 * 3681 * @return The height in pixels of the horizontal scrollbar or 0 if 3682 * there is no horizontal scrollbar. 3683 */ 3684 protected int getHorizontalScrollbarHeight() { 3685 ScrollabilityCache cache = mScrollCache; 3686 if (cache != null) { 3687 ScrollBarDrawable scrollBar = cache.scrollBar; 3688 if (scrollBar != null) { 3689 int size = scrollBar.getSize(false); 3690 if (size <= 0) { 3691 size = cache.scrollBarSize; 3692 } 3693 return size; 3694 } 3695 return 0; 3696 } 3697 return 0; 3698 } 3699 3700 /** 3701 * <p> 3702 * Initializes the scrollbars from a given set of styled attributes. This 3703 * method should be called by subclasses that need scrollbars and when an 3704 * instance of these subclasses is created programmatically rather than 3705 * being inflated from XML. This method is automatically called when the XML 3706 * is inflated. 3707 * </p> 3708 * 3709 * @param a the styled attributes set to initialize the scrollbars from 3710 */ 3711 protected void initializeScrollbars(TypedArray a) { 3712 initScrollCache(); 3713 3714 final ScrollabilityCache scrollabilityCache = mScrollCache; 3715 3716 if (scrollabilityCache.scrollBar == null) { 3717 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3718 } 3719 3720 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3721 3722 if (!fadeScrollbars) { 3723 scrollabilityCache.state = ScrollabilityCache.ON; 3724 } 3725 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3726 3727 3728 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3729 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3730 .getScrollBarFadeDuration()); 3731 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3732 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3733 ViewConfiguration.getScrollDefaultDelay()); 3734 3735 3736 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3737 com.android.internal.R.styleable.View_scrollbarSize, 3738 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3739 3740 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3741 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3742 3743 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3744 if (thumb != null) { 3745 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3746 } 3747 3748 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3749 false); 3750 if (alwaysDraw) { 3751 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3752 } 3753 3754 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3755 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3756 3757 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3758 if (thumb != null) { 3759 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3760 } 3761 3762 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3763 false); 3764 if (alwaysDraw) { 3765 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3766 } 3767 3768 // Re-apply user/background padding so that scrollbar(s) get added 3769 resolvePadding(); 3770 } 3771 3772 /** 3773 * <p> 3774 * Initalizes the scrollability cache if necessary. 3775 * </p> 3776 */ 3777 private void initScrollCache() { 3778 if (mScrollCache == null) { 3779 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3780 } 3781 } 3782 3783 private ScrollabilityCache getScrollCache() { 3784 initScrollCache(); 3785 return mScrollCache; 3786 } 3787 3788 /** 3789 * Set the position of the vertical scroll bar. Should be one of 3790 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3791 * {@link #SCROLLBAR_POSITION_RIGHT}. 3792 * 3793 * @param position Where the vertical scroll bar should be positioned. 3794 */ 3795 public void setVerticalScrollbarPosition(int position) { 3796 if (mVerticalScrollbarPosition != position) { 3797 mVerticalScrollbarPosition = position; 3798 computeOpaqueFlags(); 3799 resolvePadding(); 3800 } 3801 } 3802 3803 /** 3804 * @return The position where the vertical scroll bar will show, if applicable. 3805 * @see #setVerticalScrollbarPosition(int) 3806 */ 3807 public int getVerticalScrollbarPosition() { 3808 return mVerticalScrollbarPosition; 3809 } 3810 3811 ListenerInfo getListenerInfo() { 3812 if (mListenerInfo != null) { 3813 return mListenerInfo; 3814 } 3815 mListenerInfo = new ListenerInfo(); 3816 return mListenerInfo; 3817 } 3818 3819 /** 3820 * Register a callback to be invoked when focus of this view changed. 3821 * 3822 * @param l The callback that will run. 3823 */ 3824 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3825 getListenerInfo().mOnFocusChangeListener = l; 3826 } 3827 3828 /** 3829 * Add a listener that will be called when the bounds of the view change due to 3830 * layout processing. 3831 * 3832 * @param listener The listener that will be called when layout bounds change. 3833 */ 3834 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3835 ListenerInfo li = getListenerInfo(); 3836 if (li.mOnLayoutChangeListeners == null) { 3837 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3838 } 3839 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3840 li.mOnLayoutChangeListeners.add(listener); 3841 } 3842 } 3843 3844 /** 3845 * Remove a listener for layout changes. 3846 * 3847 * @param listener The listener for layout bounds change. 3848 */ 3849 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3850 ListenerInfo li = mListenerInfo; 3851 if (li == null || li.mOnLayoutChangeListeners == null) { 3852 return; 3853 } 3854 li.mOnLayoutChangeListeners.remove(listener); 3855 } 3856 3857 /** 3858 * Add a listener for attach state changes. 3859 * 3860 * This listener will be called whenever this view is attached or detached 3861 * from a window. Remove the listener using 3862 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3863 * 3864 * @param listener Listener to attach 3865 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3866 */ 3867 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3868 ListenerInfo li = getListenerInfo(); 3869 if (li.mOnAttachStateChangeListeners == null) { 3870 li.mOnAttachStateChangeListeners 3871 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3872 } 3873 li.mOnAttachStateChangeListeners.add(listener); 3874 } 3875 3876 /** 3877 * Remove a listener for attach state changes. The listener will receive no further 3878 * notification of window attach/detach events. 3879 * 3880 * @param listener Listener to remove 3881 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3882 */ 3883 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3884 ListenerInfo li = mListenerInfo; 3885 if (li == null || li.mOnAttachStateChangeListeners == null) { 3886 return; 3887 } 3888 li.mOnAttachStateChangeListeners.remove(listener); 3889 } 3890 3891 /** 3892 * Returns the focus-change callback registered for this view. 3893 * 3894 * @return The callback, or null if one is not registered. 3895 */ 3896 public OnFocusChangeListener getOnFocusChangeListener() { 3897 ListenerInfo li = mListenerInfo; 3898 return li != null ? li.mOnFocusChangeListener : null; 3899 } 3900 3901 /** 3902 * Register a callback to be invoked when this view is clicked. If this view is not 3903 * clickable, it becomes clickable. 3904 * 3905 * @param l The callback that will run 3906 * 3907 * @see #setClickable(boolean) 3908 */ 3909 public void setOnClickListener(OnClickListener l) { 3910 if (!isClickable()) { 3911 setClickable(true); 3912 } 3913 getListenerInfo().mOnClickListener = l; 3914 } 3915 3916 /** 3917 * Return whether this view has an attached OnClickListener. Returns 3918 * true if there is a listener, false if there is none. 3919 */ 3920 public boolean hasOnClickListeners() { 3921 ListenerInfo li = mListenerInfo; 3922 return (li != null && li.mOnClickListener != null); 3923 } 3924 3925 /** 3926 * Register a callback to be invoked when this view is clicked and held. If this view is not 3927 * long clickable, it becomes long clickable. 3928 * 3929 * @param l The callback that will run 3930 * 3931 * @see #setLongClickable(boolean) 3932 */ 3933 public void setOnLongClickListener(OnLongClickListener l) { 3934 if (!isLongClickable()) { 3935 setLongClickable(true); 3936 } 3937 getListenerInfo().mOnLongClickListener = l; 3938 } 3939 3940 /** 3941 * Register a callback to be invoked when the context menu for this view is 3942 * being built. If this view is not long clickable, it becomes long clickable. 3943 * 3944 * @param l The callback that will run 3945 * 3946 */ 3947 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3948 if (!isLongClickable()) { 3949 setLongClickable(true); 3950 } 3951 getListenerInfo().mOnCreateContextMenuListener = l; 3952 } 3953 3954 /** 3955 * Call this view's OnClickListener, if it is defined. Performs all normal 3956 * actions associated with clicking: reporting accessibility event, playing 3957 * a sound, etc. 3958 * 3959 * @return True there was an assigned OnClickListener that was called, false 3960 * otherwise is returned. 3961 */ 3962 public boolean performClick() { 3963 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3964 3965 ListenerInfo li = mListenerInfo; 3966 if (li != null && li.mOnClickListener != null) { 3967 playSoundEffect(SoundEffectConstants.CLICK); 3968 li.mOnClickListener.onClick(this); 3969 return true; 3970 } 3971 3972 return false; 3973 } 3974 3975 /** 3976 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3977 * this only calls the listener, and does not do any associated clicking 3978 * actions like reporting an accessibility event. 3979 * 3980 * @return True there was an assigned OnClickListener that was called, false 3981 * otherwise is returned. 3982 */ 3983 public boolean callOnClick() { 3984 ListenerInfo li = mListenerInfo; 3985 if (li != null && li.mOnClickListener != null) { 3986 li.mOnClickListener.onClick(this); 3987 return true; 3988 } 3989 return false; 3990 } 3991 3992 /** 3993 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3994 * OnLongClickListener did not consume the event. 3995 * 3996 * @return True if one of the above receivers consumed the event, false otherwise. 3997 */ 3998 public boolean performLongClick() { 3999 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4000 4001 boolean handled = false; 4002 ListenerInfo li = mListenerInfo; 4003 if (li != null && li.mOnLongClickListener != null) { 4004 handled = li.mOnLongClickListener.onLongClick(View.this); 4005 } 4006 if (!handled) { 4007 handled = showContextMenu(); 4008 } 4009 if (handled) { 4010 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4011 } 4012 return handled; 4013 } 4014 4015 /** 4016 * Performs button-related actions during a touch down event. 4017 * 4018 * @param event The event. 4019 * @return True if the down was consumed. 4020 * 4021 * @hide 4022 */ 4023 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4024 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4025 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4026 return true; 4027 } 4028 } 4029 return false; 4030 } 4031 4032 /** 4033 * Bring up the context menu for this view. 4034 * 4035 * @return Whether a context menu was displayed. 4036 */ 4037 public boolean showContextMenu() { 4038 return getParent().showContextMenuForChild(this); 4039 } 4040 4041 /** 4042 * Bring up the context menu for this view, referring to the item under the specified point. 4043 * 4044 * @param x The referenced x coordinate. 4045 * @param y The referenced y coordinate. 4046 * @param metaState The keyboard modifiers that were pressed. 4047 * @return Whether a context menu was displayed. 4048 * 4049 * @hide 4050 */ 4051 public boolean showContextMenu(float x, float y, int metaState) { 4052 return showContextMenu(); 4053 } 4054 4055 /** 4056 * Start an action mode. 4057 * 4058 * @param callback Callback that will control the lifecycle of the action mode 4059 * @return The new action mode if it is started, null otherwise 4060 * 4061 * @see ActionMode 4062 */ 4063 public ActionMode startActionMode(ActionMode.Callback callback) { 4064 ViewParent parent = getParent(); 4065 if (parent == null) return null; 4066 return parent.startActionModeForChild(this, callback); 4067 } 4068 4069 /** 4070 * Register a callback to be invoked when a key is pressed in this view. 4071 * @param l the key listener to attach to this view 4072 */ 4073 public void setOnKeyListener(OnKeyListener l) { 4074 getListenerInfo().mOnKeyListener = l; 4075 } 4076 4077 /** 4078 * Register a callback to be invoked when a touch event is sent to this view. 4079 * @param l the touch listener to attach to this view 4080 */ 4081 public void setOnTouchListener(OnTouchListener l) { 4082 getListenerInfo().mOnTouchListener = l; 4083 } 4084 4085 /** 4086 * Register a callback to be invoked when a generic motion event is sent to this view. 4087 * @param l the generic motion listener to attach to this view 4088 */ 4089 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4090 getListenerInfo().mOnGenericMotionListener = l; 4091 } 4092 4093 /** 4094 * Register a callback to be invoked when a hover event is sent to this view. 4095 * @param l the hover listener to attach to this view 4096 */ 4097 public void setOnHoverListener(OnHoverListener l) { 4098 getListenerInfo().mOnHoverListener = l; 4099 } 4100 4101 /** 4102 * Register a drag event listener callback object for this View. The parameter is 4103 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4104 * View, the system calls the 4105 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4106 * @param l An implementation of {@link android.view.View.OnDragListener}. 4107 */ 4108 public void setOnDragListener(OnDragListener l) { 4109 getListenerInfo().mOnDragListener = l; 4110 } 4111 4112 /** 4113 * Give this view focus. This will cause 4114 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4115 * 4116 * Note: this does not check whether this {@link View} should get focus, it just 4117 * gives it focus no matter what. It should only be called internally by framework 4118 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4119 * 4120 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4121 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4122 * focus moved when requestFocus() is called. It may not always 4123 * apply, in which case use the default View.FOCUS_DOWN. 4124 * @param previouslyFocusedRect The rectangle of the view that had focus 4125 * prior in this View's coordinate system. 4126 */ 4127 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4128 if (DBG) { 4129 System.out.println(this + " requestFocus()"); 4130 } 4131 4132 if ((mPrivateFlags & FOCUSED) == 0) { 4133 mPrivateFlags |= FOCUSED; 4134 4135 if (mParent != null) { 4136 mParent.requestChildFocus(this, this); 4137 } 4138 4139 onFocusChanged(true, direction, previouslyFocusedRect); 4140 refreshDrawableState(); 4141 4142 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4143 notifyAccessibilityStateChanged(); 4144 } 4145 } 4146 } 4147 4148 /** 4149 * Request that a rectangle of this view be visible on the screen, 4150 * scrolling if necessary just enough. 4151 * 4152 * <p>A View should call this if it maintains some notion of which part 4153 * of its content is interesting. For example, a text editing view 4154 * should call this when its cursor moves. 4155 * 4156 * @param rectangle The rectangle. 4157 * @return Whether any parent scrolled. 4158 */ 4159 public boolean requestRectangleOnScreen(Rect rectangle) { 4160 return requestRectangleOnScreen(rectangle, false); 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 * <p>When <code>immediate</code> is set to true, scrolling will not be 4172 * animated. 4173 * 4174 * @param rectangle The rectangle. 4175 * @param immediate True to forbid animated scrolling, false otherwise 4176 * @return Whether any parent scrolled. 4177 */ 4178 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4179 View child = this; 4180 ViewParent parent = mParent; 4181 boolean scrolled = false; 4182 while (parent != null) { 4183 scrolled |= parent.requestChildRectangleOnScreen(child, 4184 rectangle, immediate); 4185 4186 // offset rect so next call has the rectangle in the 4187 // coordinate system of its direct child. 4188 rectangle.offset(child.getLeft(), child.getTop()); 4189 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4190 4191 if (!(parent instanceof View)) { 4192 break; 4193 } 4194 4195 child = (View) parent; 4196 parent = child.getParent(); 4197 } 4198 return scrolled; 4199 } 4200 4201 /** 4202 * Called when this view wants to give up focus. If focus is cleared 4203 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4204 * <p> 4205 * <strong>Note:</strong> When a View clears focus the framework is trying 4206 * to give focus to the first focusable View from the top. Hence, if this 4207 * View is the first from the top that can take focus, then all callbacks 4208 * related to clearing focus will be invoked after wich the framework will 4209 * give focus to this view. 4210 * </p> 4211 */ 4212 public void clearFocus() { 4213 if (DBG) { 4214 System.out.println(this + " clearFocus()"); 4215 } 4216 4217 if ((mPrivateFlags & FOCUSED) != 0) { 4218 mPrivateFlags &= ~FOCUSED; 4219 4220 if (mParent != null) { 4221 mParent.clearChildFocus(this); 4222 } 4223 4224 onFocusChanged(false, 0, null); 4225 4226 refreshDrawableState(); 4227 4228 ensureInputFocusOnFirstFocusable(); 4229 4230 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4231 notifyAccessibilityStateChanged(); 4232 } 4233 } 4234 } 4235 4236 void ensureInputFocusOnFirstFocusable() { 4237 View root = getRootView(); 4238 if (root != null) { 4239 root.requestFocus(); 4240 } 4241 } 4242 4243 /** 4244 * Called internally by the view system when a new view is getting focus. 4245 * This is what clears the old focus. 4246 */ 4247 void unFocus() { 4248 if (DBG) { 4249 System.out.println(this + " unFocus()"); 4250 } 4251 4252 if ((mPrivateFlags & FOCUSED) != 0) { 4253 mPrivateFlags &= ~FOCUSED; 4254 4255 onFocusChanged(false, 0, null); 4256 refreshDrawableState(); 4257 4258 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4259 notifyAccessibilityStateChanged(); 4260 } 4261 } 4262 } 4263 4264 /** 4265 * Returns true if this view has focus iteself, or is the ancestor of the 4266 * view that has focus. 4267 * 4268 * @return True if this view has or contains focus, false otherwise. 4269 */ 4270 @ViewDebug.ExportedProperty(category = "focus") 4271 public boolean hasFocus() { 4272 return (mPrivateFlags & FOCUSED) != 0; 4273 } 4274 4275 /** 4276 * Returns true if this view is focusable or if it contains a reachable View 4277 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4278 * is a View whose parents do not block descendants focus. 4279 * 4280 * Only {@link #VISIBLE} views are considered focusable. 4281 * 4282 * @return True if the view is focusable or if the view contains a focusable 4283 * View, false otherwise. 4284 * 4285 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4286 */ 4287 public boolean hasFocusable() { 4288 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4289 } 4290 4291 /** 4292 * Called by the view system when the focus state of this view changes. 4293 * When the focus change event is caused by directional navigation, direction 4294 * and previouslyFocusedRect provide insight into where the focus is coming from. 4295 * When overriding, be sure to call up through to the super class so that 4296 * the standard focus handling will occur. 4297 * 4298 * @param gainFocus True if the View has focus; false otherwise. 4299 * @param direction The direction focus has moved when requestFocus() 4300 * is called to give this view focus. Values are 4301 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4302 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4303 * It may not always apply, in which case use the default. 4304 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4305 * system, of the previously focused view. If applicable, this will be 4306 * passed in as finer grained information about where the focus is coming 4307 * from (in addition to direction). Will be <code>null</code> otherwise. 4308 */ 4309 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4310 if (gainFocus) { 4311 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4312 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4313 } 4314 } 4315 4316 InputMethodManager imm = InputMethodManager.peekInstance(); 4317 if (!gainFocus) { 4318 if (isPressed()) { 4319 setPressed(false); 4320 } 4321 if (imm != null && mAttachInfo != null 4322 && mAttachInfo.mHasWindowFocus) { 4323 imm.focusOut(this); 4324 } 4325 onFocusLost(); 4326 } else if (imm != null && mAttachInfo != null 4327 && mAttachInfo.mHasWindowFocus) { 4328 imm.focusIn(this); 4329 } 4330 4331 invalidate(true); 4332 ListenerInfo li = mListenerInfo; 4333 if (li != null && li.mOnFocusChangeListener != null) { 4334 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4335 } 4336 4337 if (mAttachInfo != null) { 4338 mAttachInfo.mKeyDispatchState.reset(this); 4339 } 4340 } 4341 4342 /** 4343 * Sends an accessibility event of the given type. If accessiiblity is 4344 * not enabled this method has no effect. The default implementation calls 4345 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4346 * to populate information about the event source (this View), then calls 4347 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4348 * populate the text content of the event source including its descendants, 4349 * and last calls 4350 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4351 * on its parent to resuest sending of the event to interested parties. 4352 * <p> 4353 * If an {@link AccessibilityDelegate} has been specified via calling 4354 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4355 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4356 * responsible for handling this call. 4357 * </p> 4358 * 4359 * @param eventType The type of the event to send, as defined by several types from 4360 * {@link android.view.accessibility.AccessibilityEvent}, such as 4361 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4362 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4363 * 4364 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4365 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4366 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4367 * @see AccessibilityDelegate 4368 */ 4369 public void sendAccessibilityEvent(int eventType) { 4370 if (mAccessibilityDelegate != null) { 4371 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4372 } else { 4373 sendAccessibilityEventInternal(eventType); 4374 } 4375 } 4376 4377 /** 4378 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4379 * {@link AccessibilityEvent} to make an announcement which is related to some 4380 * sort of a context change for which none of the events representing UI transitions 4381 * is a good fit. For example, announcing a new page in a book. If accessibility 4382 * is not enabled this method does nothing. 4383 * 4384 * @param text The announcement text. 4385 */ 4386 public void announceForAccessibility(CharSequence text) { 4387 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4388 AccessibilityEvent event = AccessibilityEvent.obtain( 4389 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4390 event.getText().add(text); 4391 sendAccessibilityEventUnchecked(event); 4392 } 4393 } 4394 4395 /** 4396 * @see #sendAccessibilityEvent(int) 4397 * 4398 * Note: Called from the default {@link AccessibilityDelegate}. 4399 */ 4400 void sendAccessibilityEventInternal(int eventType) { 4401 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4402 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4403 } 4404 } 4405 4406 /** 4407 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4408 * takes as an argument an empty {@link AccessibilityEvent} and does not 4409 * perform a check whether accessibility is enabled. 4410 * <p> 4411 * If an {@link AccessibilityDelegate} has been specified via calling 4412 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4413 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4414 * is responsible for handling this call. 4415 * </p> 4416 * 4417 * @param event The event to send. 4418 * 4419 * @see #sendAccessibilityEvent(int) 4420 */ 4421 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4422 if (mAccessibilityDelegate != null) { 4423 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4424 } else { 4425 sendAccessibilityEventUncheckedInternal(event); 4426 } 4427 } 4428 4429 /** 4430 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4431 * 4432 * Note: Called from the default {@link AccessibilityDelegate}. 4433 */ 4434 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4435 if (!isShown()) { 4436 return; 4437 } 4438 onInitializeAccessibilityEvent(event); 4439 // Only a subset of accessibility events populates text content. 4440 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4441 dispatchPopulateAccessibilityEvent(event); 4442 } 4443 // Intercept accessibility focus events fired by virtual nodes to keep 4444 // track of accessibility focus position in such nodes. 4445 final int eventType = event.getEventType(); 4446 switch (eventType) { 4447 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4448 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4449 event.getSourceNodeId()); 4450 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4451 ViewRootImpl viewRootImpl = getViewRootImpl(); 4452 if (viewRootImpl != null) { 4453 viewRootImpl.setAccessibilityFocusedHost(this); 4454 } 4455 } 4456 } break; 4457 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4458 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4459 event.getSourceNodeId()); 4460 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4461 ViewRootImpl viewRootImpl = getViewRootImpl(); 4462 if (viewRootImpl != null) { 4463 viewRootImpl.setAccessibilityFocusedHost(null); 4464 } 4465 } 4466 } break; 4467 } 4468 // In the beginning we called #isShown(), so we know that getParent() is not null. 4469 getParent().requestSendAccessibilityEvent(this, event); 4470 } 4471 4472 /** 4473 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4474 * to its children for adding their text content to the event. Note that the 4475 * event text is populated in a separate dispatch path since we add to the 4476 * event not only the text of the source but also the text of all its descendants. 4477 * A typical implementation will call 4478 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4479 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4480 * on each child. Override this method if custom population of the event text 4481 * content is required. 4482 * <p> 4483 * If an {@link AccessibilityDelegate} has been specified via calling 4484 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4485 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4486 * is responsible for handling this call. 4487 * </p> 4488 * <p> 4489 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4490 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4491 * </p> 4492 * 4493 * @param event The event. 4494 * 4495 * @return True if the event population was completed. 4496 */ 4497 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4498 if (mAccessibilityDelegate != null) { 4499 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4500 } else { 4501 return dispatchPopulateAccessibilityEventInternal(event); 4502 } 4503 } 4504 4505 /** 4506 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4507 * 4508 * Note: Called from the default {@link AccessibilityDelegate}. 4509 */ 4510 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4511 onPopulateAccessibilityEvent(event); 4512 return false; 4513 } 4514 4515 /** 4516 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4517 * giving a chance to this View to populate the accessibility event with its 4518 * text content. While this method is free to modify event 4519 * attributes other than text content, doing so should normally be performed in 4520 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4521 * <p> 4522 * Example: Adding formatted date string to an accessibility event in addition 4523 * to the text added by the super implementation: 4524 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4525 * super.onPopulateAccessibilityEvent(event); 4526 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4527 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4528 * mCurrentDate.getTimeInMillis(), flags); 4529 * event.getText().add(selectedDateUtterance); 4530 * }</pre> 4531 * <p> 4532 * If an {@link AccessibilityDelegate} has been specified via calling 4533 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4534 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4535 * is responsible for handling this call. 4536 * </p> 4537 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4538 * information to the event, in case the default implementation has basic information to add. 4539 * </p> 4540 * 4541 * @param event The accessibility event which to populate. 4542 * 4543 * @see #sendAccessibilityEvent(int) 4544 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4545 */ 4546 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4547 if (mAccessibilityDelegate != null) { 4548 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4549 } else { 4550 onPopulateAccessibilityEventInternal(event); 4551 } 4552 } 4553 4554 /** 4555 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4556 * 4557 * Note: Called from the default {@link AccessibilityDelegate}. 4558 */ 4559 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4560 4561 } 4562 4563 /** 4564 * Initializes an {@link AccessibilityEvent} with information about 4565 * this View which is the event source. In other words, the source of 4566 * an accessibility event is the view whose state change triggered firing 4567 * the event. 4568 * <p> 4569 * Example: Setting the password property of an event in addition 4570 * to properties set by the super implementation: 4571 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4572 * super.onInitializeAccessibilityEvent(event); 4573 * event.setPassword(true); 4574 * }</pre> 4575 * <p> 4576 * If an {@link AccessibilityDelegate} has been specified via calling 4577 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4578 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4579 * is responsible for handling this call. 4580 * </p> 4581 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4582 * information to the event, in case the default implementation has basic information to add. 4583 * </p> 4584 * @param event The event to initialize. 4585 * 4586 * @see #sendAccessibilityEvent(int) 4587 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4588 */ 4589 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4590 if (mAccessibilityDelegate != null) { 4591 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4592 } else { 4593 onInitializeAccessibilityEventInternal(event); 4594 } 4595 } 4596 4597 /** 4598 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4599 * 4600 * Note: Called from the default {@link AccessibilityDelegate}. 4601 */ 4602 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4603 event.setSource(this); 4604 event.setClassName(View.class.getName()); 4605 event.setPackageName(getContext().getPackageName()); 4606 event.setEnabled(isEnabled()); 4607 event.setContentDescription(mContentDescription); 4608 4609 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4610 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4611 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4612 FOCUSABLES_ALL); 4613 event.setItemCount(focusablesTempList.size()); 4614 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4615 focusablesTempList.clear(); 4616 } 4617 } 4618 4619 /** 4620 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4621 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4622 * This method is responsible for obtaining an accessibility node info from a 4623 * pool of reusable instances and calling 4624 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4625 * initialize the former. 4626 * <p> 4627 * Note: The client is responsible for recycling the obtained instance by calling 4628 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4629 * </p> 4630 * 4631 * @return A populated {@link AccessibilityNodeInfo}. 4632 * 4633 * @see AccessibilityNodeInfo 4634 */ 4635 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4636 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4637 if (provider != null) { 4638 return provider.createAccessibilityNodeInfo(View.NO_ID); 4639 } else { 4640 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4641 onInitializeAccessibilityNodeInfo(info); 4642 return info; 4643 } 4644 } 4645 4646 /** 4647 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4648 * The base implementation sets: 4649 * <ul> 4650 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4651 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4652 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4653 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4654 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4655 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4656 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4657 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4658 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4659 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4660 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4661 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4662 * </ul> 4663 * <p> 4664 * Subclasses should override this method, call the super implementation, 4665 * and set additional attributes. 4666 * </p> 4667 * <p> 4668 * If an {@link AccessibilityDelegate} has been specified via calling 4669 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4670 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4671 * is responsible for handling this call. 4672 * </p> 4673 * 4674 * @param info The instance to initialize. 4675 */ 4676 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4677 if (mAccessibilityDelegate != null) { 4678 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4679 } else { 4680 onInitializeAccessibilityNodeInfoInternal(info); 4681 } 4682 } 4683 4684 /** 4685 * Gets the location of this view in screen coordintates. 4686 * 4687 * @param outRect The output location 4688 */ 4689 private void getBoundsOnScreen(Rect outRect) { 4690 if (mAttachInfo == null) { 4691 return; 4692 } 4693 4694 RectF position = mAttachInfo.mTmpTransformRect; 4695 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4696 4697 if (!hasIdentityMatrix()) { 4698 getMatrix().mapRect(position); 4699 } 4700 4701 position.offset(mLeft, mTop); 4702 4703 ViewParent parent = mParent; 4704 while (parent instanceof View) { 4705 View parentView = (View) parent; 4706 4707 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4708 4709 if (!parentView.hasIdentityMatrix()) { 4710 parentView.getMatrix().mapRect(position); 4711 } 4712 4713 position.offset(parentView.mLeft, parentView.mTop); 4714 4715 parent = parentView.mParent; 4716 } 4717 4718 if (parent instanceof ViewRootImpl) { 4719 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4720 position.offset(0, -viewRootImpl.mCurScrollY); 4721 } 4722 4723 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4724 4725 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4726 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4727 } 4728 4729 /** 4730 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4731 * 4732 * Note: Called from the default {@link AccessibilityDelegate}. 4733 */ 4734 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4735 Rect bounds = mAttachInfo.mTmpInvalRect; 4736 getDrawingRect(bounds); 4737 info.setBoundsInParent(bounds); 4738 4739 getBoundsOnScreen(bounds); 4740 info.setBoundsInScreen(bounds); 4741 4742 ViewParent parent = getParentForAccessibility(); 4743 if (parent instanceof View) { 4744 info.setParent((View) parent); 4745 } 4746 4747 info.setVisibleToUser(isVisibleToUser()); 4748 4749 info.setPackageName(mContext.getPackageName()); 4750 info.setClassName(View.class.getName()); 4751 info.setContentDescription(getContentDescription()); 4752 4753 info.setEnabled(isEnabled()); 4754 info.setClickable(isClickable()); 4755 info.setFocusable(isFocusable()); 4756 info.setFocused(isFocused()); 4757 info.setAccessibilityFocused(isAccessibilityFocused()); 4758 info.setSelected(isSelected()); 4759 info.setLongClickable(isLongClickable()); 4760 4761 // TODO: These make sense only if we are in an AdapterView but all 4762 // views can be selected. Maybe from accessiiblity perspective 4763 // we should report as selectable view in an AdapterView. 4764 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4765 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4766 4767 if (isFocusable()) { 4768 if (isFocused()) { 4769 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4770 } else { 4771 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4772 } 4773 } 4774 4775 if (!isAccessibilityFocused()) { 4776 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4777 } else { 4778 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4779 } 4780 4781 if (isClickable() && isEnabled()) { 4782 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4783 } 4784 4785 if (isLongClickable() && isEnabled()) { 4786 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4787 } 4788 4789 if (mContentDescription != null && mContentDescription.length() > 0) { 4790 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4791 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4792 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4793 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4794 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4795 } 4796 } 4797 4798 /** 4799 * Computes whether this view is visible to the user. Such a view is 4800 * attached, visible, all its predecessors are visible, it is not clipped 4801 * entirely by its predecessors, and has an alpha greater than zero. 4802 * 4803 * @return Whether the view is visible on the screen. 4804 * 4805 * @hide 4806 */ 4807 protected boolean isVisibleToUser() { 4808 return isVisibleToUser(null); 4809 } 4810 4811 /** 4812 * Computes whether the given portion of this view is visible to the user. Such a view is 4813 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4814 * the specified portion is not clipped entirely by its predecessors. 4815 * 4816 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4817 * <code>null</code>, and the entire view will be tested in this case. 4818 * When <code>true</code> is returned by the function, the actual visible 4819 * region will be stored in this parameter; that is, if boundInView is fully 4820 * contained within the view, no modification will be made, otherwise regions 4821 * outside of the visible area of the view will be clipped. 4822 * 4823 * @return Whether the specified portion of the view is visible on the screen. 4824 * 4825 * @hide 4826 */ 4827 protected boolean isVisibleToUser(Rect boundInView) { 4828 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4829 Point offset = mAttachInfo.mPoint; 4830 // The first two checks are made also made by isShown() which 4831 // however traverses the tree up to the parent to catch that. 4832 // Therefore, we do some fail fast check to minimize the up 4833 // tree traversal. 4834 boolean isVisible = mAttachInfo != null 4835 && mAttachInfo.mWindowVisibility == View.VISIBLE 4836 && getAlpha() > 0 4837 && isShown() 4838 && getGlobalVisibleRect(visibleRect, offset); 4839 if (isVisible && boundInView != null) { 4840 visibleRect.offset(-offset.x, -offset.y); 4841 isVisible &= boundInView.intersect(visibleRect); 4842 } 4843 return isVisible; 4844 } 4845 4846 /** 4847 * Sets a delegate for implementing accessibility support via compositon as 4848 * opposed to inheritance. The delegate's primary use is for implementing 4849 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4850 * 4851 * @param delegate The delegate instance. 4852 * 4853 * @see AccessibilityDelegate 4854 */ 4855 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4856 mAccessibilityDelegate = delegate; 4857 } 4858 4859 /** 4860 * Gets the provider for managing a virtual view hierarchy rooted at this View 4861 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4862 * that explore the window content. 4863 * <p> 4864 * If this method returns an instance, this instance is responsible for managing 4865 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4866 * View including the one representing the View itself. Similarly the returned 4867 * instance is responsible for performing accessibility actions on any virtual 4868 * view or the root view itself. 4869 * </p> 4870 * <p> 4871 * If an {@link AccessibilityDelegate} has been specified via calling 4872 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4873 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4874 * is responsible for handling this call. 4875 * </p> 4876 * 4877 * @return The provider. 4878 * 4879 * @see AccessibilityNodeProvider 4880 */ 4881 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4882 if (mAccessibilityDelegate != null) { 4883 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4884 } else { 4885 return null; 4886 } 4887 } 4888 4889 /** 4890 * Gets the unique identifier of this view on the screen for accessibility purposes. 4891 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4892 * 4893 * @return The view accessibility id. 4894 * 4895 * @hide 4896 */ 4897 public int getAccessibilityViewId() { 4898 if (mAccessibilityViewId == NO_ID) { 4899 mAccessibilityViewId = sNextAccessibilityViewId++; 4900 } 4901 return mAccessibilityViewId; 4902 } 4903 4904 /** 4905 * Gets the unique identifier of the window in which this View reseides. 4906 * 4907 * @return The window accessibility id. 4908 * 4909 * @hide 4910 */ 4911 public int getAccessibilityWindowId() { 4912 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4913 } 4914 4915 /** 4916 * Gets the {@link View} description. It briefly describes the view and is 4917 * primarily used for accessibility support. Set this property to enable 4918 * better accessibility support for your application. This is especially 4919 * true for views that do not have textual representation (For example, 4920 * ImageButton). 4921 * 4922 * @return The content description. 4923 * 4924 * @attr ref android.R.styleable#View_contentDescription 4925 */ 4926 @ViewDebug.ExportedProperty(category = "accessibility") 4927 public CharSequence getContentDescription() { 4928 return mContentDescription; 4929 } 4930 4931 /** 4932 * Sets 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 * @param contentDescription The content description. 4939 * 4940 * @attr ref android.R.styleable#View_contentDescription 4941 */ 4942 @RemotableViewMethod 4943 public void setContentDescription(CharSequence contentDescription) { 4944 mContentDescription = contentDescription; 4945 } 4946 4947 /** 4948 * Invoked whenever this view loses focus, either by losing window focus or by losing 4949 * focus within its window. This method can be used to clear any state tied to the 4950 * focus. For instance, if a button is held pressed with the trackball and the window 4951 * loses focus, this method can be used to cancel the press. 4952 * 4953 * Subclasses of View overriding this method should always call super.onFocusLost(). 4954 * 4955 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4956 * @see #onWindowFocusChanged(boolean) 4957 * 4958 * @hide pending API council approval 4959 */ 4960 protected void onFocusLost() { 4961 resetPressedState(); 4962 } 4963 4964 private void resetPressedState() { 4965 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4966 return; 4967 } 4968 4969 if (isPressed()) { 4970 setPressed(false); 4971 4972 if (!mHasPerformedLongPress) { 4973 removeLongPressCallback(); 4974 } 4975 } 4976 } 4977 4978 /** 4979 * Returns true if this view has focus 4980 * 4981 * @return True if this view has focus, false otherwise. 4982 */ 4983 @ViewDebug.ExportedProperty(category = "focus") 4984 public boolean isFocused() { 4985 return (mPrivateFlags & FOCUSED) != 0; 4986 } 4987 4988 /** 4989 * Find the view in the hierarchy rooted at this view that currently has 4990 * focus. 4991 * 4992 * @return The view that currently has focus, or null if no focused view can 4993 * be found. 4994 */ 4995 public View findFocus() { 4996 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4997 } 4998 4999 /** 5000 * Indicates whether this view is one of the set of scrollable containers in 5001 * its window. 5002 * 5003 * @return whether this view is one of the set of scrollable containers in 5004 * its window 5005 * 5006 * @attr ref android.R.styleable#View_isScrollContainer 5007 */ 5008 public boolean isScrollContainer() { 5009 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5010 } 5011 5012 /** 5013 * Change whether this view is one of the set of scrollable containers in 5014 * its window. This will be used to determine whether the window can 5015 * resize or must pan when a soft input area is open -- scrollable 5016 * containers allow the window to use resize mode since the container 5017 * will appropriately shrink. 5018 * 5019 * @attr ref android.R.styleable#View_isScrollContainer 5020 */ 5021 public void setScrollContainer(boolean isScrollContainer) { 5022 if (isScrollContainer) { 5023 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5024 mAttachInfo.mScrollContainers.add(this); 5025 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5026 } 5027 mPrivateFlags |= SCROLL_CONTAINER; 5028 } else { 5029 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5030 mAttachInfo.mScrollContainers.remove(this); 5031 } 5032 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5033 } 5034 } 5035 5036 /** 5037 * Returns the quality of the drawing cache. 5038 * 5039 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5040 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5041 * 5042 * @see #setDrawingCacheQuality(int) 5043 * @see #setDrawingCacheEnabled(boolean) 5044 * @see #isDrawingCacheEnabled() 5045 * 5046 * @attr ref android.R.styleable#View_drawingCacheQuality 5047 */ 5048 public int getDrawingCacheQuality() { 5049 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5050 } 5051 5052 /** 5053 * Set the drawing cache quality of this view. This value is used only when the 5054 * drawing cache is enabled 5055 * 5056 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5057 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5058 * 5059 * @see #getDrawingCacheQuality() 5060 * @see #setDrawingCacheEnabled(boolean) 5061 * @see #isDrawingCacheEnabled() 5062 * 5063 * @attr ref android.R.styleable#View_drawingCacheQuality 5064 */ 5065 public void setDrawingCacheQuality(int quality) { 5066 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5067 } 5068 5069 /** 5070 * Returns whether the screen should remain on, corresponding to the current 5071 * value of {@link #KEEP_SCREEN_ON}. 5072 * 5073 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5074 * 5075 * @see #setKeepScreenOn(boolean) 5076 * 5077 * @attr ref android.R.styleable#View_keepScreenOn 5078 */ 5079 public boolean getKeepScreenOn() { 5080 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5081 } 5082 5083 /** 5084 * Controls whether the screen should remain on, modifying the 5085 * value of {@link #KEEP_SCREEN_ON}. 5086 * 5087 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5088 * 5089 * @see #getKeepScreenOn() 5090 * 5091 * @attr ref android.R.styleable#View_keepScreenOn 5092 */ 5093 public void setKeepScreenOn(boolean keepScreenOn) { 5094 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5095 } 5096 5097 /** 5098 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5099 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5100 * 5101 * @attr ref android.R.styleable#View_nextFocusLeft 5102 */ 5103 public int getNextFocusLeftId() { 5104 return mNextFocusLeftId; 5105 } 5106 5107 /** 5108 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5109 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5110 * decide automatically. 5111 * 5112 * @attr ref android.R.styleable#View_nextFocusLeft 5113 */ 5114 public void setNextFocusLeftId(int nextFocusLeftId) { 5115 mNextFocusLeftId = nextFocusLeftId; 5116 } 5117 5118 /** 5119 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5120 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5121 * 5122 * @attr ref android.R.styleable#View_nextFocusRight 5123 */ 5124 public int getNextFocusRightId() { 5125 return mNextFocusRightId; 5126 } 5127 5128 /** 5129 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5130 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5131 * decide automatically. 5132 * 5133 * @attr ref android.R.styleable#View_nextFocusRight 5134 */ 5135 public void setNextFocusRightId(int nextFocusRightId) { 5136 mNextFocusRightId = nextFocusRightId; 5137 } 5138 5139 /** 5140 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5141 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5142 * 5143 * @attr ref android.R.styleable#View_nextFocusUp 5144 */ 5145 public int getNextFocusUpId() { 5146 return mNextFocusUpId; 5147 } 5148 5149 /** 5150 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5151 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5152 * decide automatically. 5153 * 5154 * @attr ref android.R.styleable#View_nextFocusUp 5155 */ 5156 public void setNextFocusUpId(int nextFocusUpId) { 5157 mNextFocusUpId = nextFocusUpId; 5158 } 5159 5160 /** 5161 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5162 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5163 * 5164 * @attr ref android.R.styleable#View_nextFocusDown 5165 */ 5166 public int getNextFocusDownId() { 5167 return mNextFocusDownId; 5168 } 5169 5170 /** 5171 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5172 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5173 * decide automatically. 5174 * 5175 * @attr ref android.R.styleable#View_nextFocusDown 5176 */ 5177 public void setNextFocusDownId(int nextFocusDownId) { 5178 mNextFocusDownId = nextFocusDownId; 5179 } 5180 5181 /** 5182 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5183 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5184 * 5185 * @attr ref android.R.styleable#View_nextFocusForward 5186 */ 5187 public int getNextFocusForwardId() { 5188 return mNextFocusForwardId; 5189 } 5190 5191 /** 5192 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5193 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5194 * decide automatically. 5195 * 5196 * @attr ref android.R.styleable#View_nextFocusForward 5197 */ 5198 public void setNextFocusForwardId(int nextFocusForwardId) { 5199 mNextFocusForwardId = nextFocusForwardId; 5200 } 5201 5202 /** 5203 * Returns the visibility of this view and all of its ancestors 5204 * 5205 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5206 */ 5207 public boolean isShown() { 5208 View current = this; 5209 //noinspection ConstantConditions 5210 do { 5211 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5212 return false; 5213 } 5214 ViewParent parent = current.mParent; 5215 if (parent == null) { 5216 return false; // We are not attached to the view root 5217 } 5218 if (!(parent instanceof View)) { 5219 return true; 5220 } 5221 current = (View) parent; 5222 } while (current != null); 5223 5224 return false; 5225 } 5226 5227 /** 5228 * Called by the view hierarchy when the content insets for a window have 5229 * changed, to allow it to adjust its content to fit within those windows. 5230 * The content insets tell you the space that the status bar, input method, 5231 * and other system windows infringe on the application's window. 5232 * 5233 * <p>You do not normally need to deal with this function, since the default 5234 * window decoration given to applications takes care of applying it to the 5235 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5236 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5237 * and your content can be placed under those system elements. You can then 5238 * use this method within your view hierarchy if you have parts of your UI 5239 * which you would like to ensure are not being covered. 5240 * 5241 * <p>The default implementation of this method simply applies the content 5242 * inset's to the view's padding, consuming that content (modifying the 5243 * insets to be 0), and returning true. This behavior is off by default, but can 5244 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5245 * 5246 * <p>This function's traversal down the hierarchy is depth-first. The same content 5247 * insets object is propagated down the hierarchy, so any changes made to it will 5248 * be seen by all following views (including potentially ones above in 5249 * the hierarchy since this is a depth-first traversal). The first view 5250 * that returns true will abort the entire traversal. 5251 * 5252 * <p>The default implementation works well for a situation where it is 5253 * used with a container that covers the entire window, allowing it to 5254 * apply the appropriate insets to its content on all edges. If you need 5255 * a more complicated layout (such as two different views fitting system 5256 * windows, one on the top of the window, and one on the bottom), 5257 * you can override the method and handle the insets however you would like. 5258 * Note that the insets provided by the framework are always relative to the 5259 * far edges of the window, not accounting for the location of the called view 5260 * within that window. (In fact when this method is called you do not yet know 5261 * where the layout will place the view, as it is done before layout happens.) 5262 * 5263 * <p>Note: unlike many View methods, there is no dispatch phase to this 5264 * call. If you are overriding it in a ViewGroup and want to allow the 5265 * call to continue to your children, you must be sure to call the super 5266 * implementation. 5267 * 5268 * <p>Here is a sample layout that makes use of fitting system windows 5269 * to have controls for a video view placed inside of the window decorations 5270 * that it hides and shows. This can be used with code like the second 5271 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5272 * 5273 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5274 * 5275 * @param insets Current content insets of the window. Prior to 5276 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5277 * the insets or else you and Android will be unhappy. 5278 * 5279 * @return Return true if this view applied the insets and it should not 5280 * continue propagating further down the hierarchy, false otherwise. 5281 * @see #getFitsSystemWindows() 5282 * @see #setFitsSystemWindows() 5283 * @see #setSystemUiVisibility(int) 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 * Sets whether or not this view should account for system screen decorations 5305 * such as the status bar and inset its content; that is, controlling whether 5306 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5307 * executed. See that method for more details. 5308 * 5309 * <p>Note that if you are providing your own implementation of 5310 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5311 * flag to true -- your implementation will be overriding the default 5312 * implementation that checks this flag. 5313 * 5314 * @param fitSystemWindows If true, then the default implementation of 5315 * {@link #fitSystemWindows(Rect)} will be executed. 5316 * 5317 * @attr ref android.R.styleable#View_fitsSystemWindows 5318 * @see #getFitsSystemWindows() 5319 * @see #fitSystemWindows(Rect) 5320 * @see #setSystemUiVisibility(int) 5321 */ 5322 public void setFitsSystemWindows(boolean fitSystemWindows) { 5323 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5324 } 5325 5326 /** 5327 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5328 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5329 * will be executed. 5330 * 5331 * @return Returns true if the default implementation of 5332 * {@link #fitSystemWindows(Rect)} will be executed. 5333 * 5334 * @attr ref android.R.styleable#View_fitsSystemWindows 5335 * @see #setFitsSystemWindows() 5336 * @see #fitSystemWindows(Rect) 5337 * @see #setSystemUiVisibility(int) 5338 */ 5339 public boolean getFitsSystemWindows() { 5340 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5341 } 5342 5343 /** @hide */ 5344 public boolean fitsSystemWindows() { 5345 return getFitsSystemWindows(); 5346 } 5347 5348 /** 5349 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5350 */ 5351 public void requestFitSystemWindows() { 5352 if (mParent != null) { 5353 mParent.requestFitSystemWindows(); 5354 } 5355 } 5356 5357 /** 5358 * For use by PhoneWindow to make its own system window fitting optional. 5359 * @hide 5360 */ 5361 public void makeOptionalFitsSystemWindows() { 5362 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5363 } 5364 5365 /** 5366 * Returns the visibility status for this view. 5367 * 5368 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5369 * @attr ref android.R.styleable#View_visibility 5370 */ 5371 @ViewDebug.ExportedProperty(mapping = { 5372 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5373 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5374 @ViewDebug.IntToString(from = GONE, to = "GONE") 5375 }) 5376 public int getVisibility() { 5377 return mViewFlags & VISIBILITY_MASK; 5378 } 5379 5380 /** 5381 * Set the enabled state of this view. 5382 * 5383 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5384 * @attr ref android.R.styleable#View_visibility 5385 */ 5386 @RemotableViewMethod 5387 public void setVisibility(int visibility) { 5388 setFlags(visibility, VISIBILITY_MASK); 5389 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5390 } 5391 5392 /** 5393 * Returns the enabled status for this view. The interpretation of the 5394 * enabled state varies by subclass. 5395 * 5396 * @return True if this view is enabled, false otherwise. 5397 */ 5398 @ViewDebug.ExportedProperty 5399 public boolean isEnabled() { 5400 return (mViewFlags & ENABLED_MASK) == ENABLED; 5401 } 5402 5403 /** 5404 * Set the enabled state of this view. The interpretation of the enabled 5405 * state varies by subclass. 5406 * 5407 * @param enabled True if this view is enabled, false otherwise. 5408 */ 5409 @RemotableViewMethod 5410 public void setEnabled(boolean enabled) { 5411 if (enabled == isEnabled()) return; 5412 5413 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5414 5415 /* 5416 * The View most likely has to change its appearance, so refresh 5417 * the drawable state. 5418 */ 5419 refreshDrawableState(); 5420 5421 // Invalidate too, since the default behavior for views is to be 5422 // be drawn at 50% alpha rather than to change the drawable. 5423 invalidate(true); 5424 } 5425 5426 /** 5427 * Set whether this view can receive the focus. 5428 * 5429 * Setting this to false will also ensure that this view is not focusable 5430 * in touch mode. 5431 * 5432 * @param focusable If true, this view can receive the focus. 5433 * 5434 * @see #setFocusableInTouchMode(boolean) 5435 * @attr ref android.R.styleable#View_focusable 5436 */ 5437 public void setFocusable(boolean focusable) { 5438 if (!focusable) { 5439 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5440 } 5441 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5442 } 5443 5444 /** 5445 * Set whether this view can receive focus while in touch mode. 5446 * 5447 * Setting this to true will also ensure that this view is focusable. 5448 * 5449 * @param focusableInTouchMode If true, this view can receive the focus while 5450 * in touch mode. 5451 * 5452 * @see #setFocusable(boolean) 5453 * @attr ref android.R.styleable#View_focusableInTouchMode 5454 */ 5455 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5456 // Focusable in touch mode should always be set before the focusable flag 5457 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5458 // which, in touch mode, will not successfully request focus on this view 5459 // because the focusable in touch mode flag is not set 5460 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5461 if (focusableInTouchMode) { 5462 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5463 } 5464 } 5465 5466 /** 5467 * Set whether this view should have sound effects enabled for events such as 5468 * clicking and touching. 5469 * 5470 * <p>You may wish to disable sound effects for a view if you already play sounds, 5471 * for instance, a dial key that plays dtmf tones. 5472 * 5473 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5474 * @see #isSoundEffectsEnabled() 5475 * @see #playSoundEffect(int) 5476 * @attr ref android.R.styleable#View_soundEffectsEnabled 5477 */ 5478 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5479 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5480 } 5481 5482 /** 5483 * @return whether this view should have sound effects enabled for events such as 5484 * clicking and touching. 5485 * 5486 * @see #setSoundEffectsEnabled(boolean) 5487 * @see #playSoundEffect(int) 5488 * @attr ref android.R.styleable#View_soundEffectsEnabled 5489 */ 5490 @ViewDebug.ExportedProperty 5491 public boolean isSoundEffectsEnabled() { 5492 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5493 } 5494 5495 /** 5496 * Set whether this view should have haptic feedback for events such as 5497 * long presses. 5498 * 5499 * <p>You may wish to disable haptic feedback if your view already controls 5500 * its own haptic feedback. 5501 * 5502 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5503 * @see #isHapticFeedbackEnabled() 5504 * @see #performHapticFeedback(int) 5505 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5506 */ 5507 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5508 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5509 } 5510 5511 /** 5512 * @return whether this view should have haptic feedback enabled for events 5513 * long presses. 5514 * 5515 * @see #setHapticFeedbackEnabled(boolean) 5516 * @see #performHapticFeedback(int) 5517 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5518 */ 5519 @ViewDebug.ExportedProperty 5520 public boolean isHapticFeedbackEnabled() { 5521 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5522 } 5523 5524 /** 5525 * Returns the layout direction for this view. 5526 * 5527 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5528 * {@link #LAYOUT_DIRECTION_RTL}, 5529 * {@link #LAYOUT_DIRECTION_INHERIT} or 5530 * {@link #LAYOUT_DIRECTION_LOCALE}. 5531 * @attr ref android.R.styleable#View_layoutDirection 5532 */ 5533 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5534 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5535 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5536 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5537 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5538 }) 5539 public int getLayoutDirection() { 5540 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5541 } 5542 5543 /** 5544 * Set the layout direction for this view. This will propagate a reset of layout direction 5545 * resolution to the view's children and resolve layout direction for this view. 5546 * 5547 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5548 * {@link #LAYOUT_DIRECTION_RTL}, 5549 * {@link #LAYOUT_DIRECTION_INHERIT} or 5550 * {@link #LAYOUT_DIRECTION_LOCALE}. 5551 * 5552 * @attr ref android.R.styleable#View_layoutDirection 5553 */ 5554 @RemotableViewMethod 5555 public void setLayoutDirection(int layoutDirection) { 5556 if (getLayoutDirection() != layoutDirection) { 5557 // Reset the current layout direction and the resolved one 5558 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5559 resetResolvedLayoutDirection(); 5560 // Set the new layout direction (filtered) and ask for a layout pass 5561 mPrivateFlags2 |= 5562 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5563 requestLayout(); 5564 } 5565 } 5566 5567 /** 5568 * Returns the resolved layout direction for this view. 5569 * 5570 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5571 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5572 */ 5573 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5574 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5575 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5576 }) 5577 public int getResolvedLayoutDirection() { 5578 // The layout diretion will be resolved only if needed 5579 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5580 resolveLayoutDirection(); 5581 } 5582 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5583 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5584 } 5585 5586 /** 5587 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5588 * layout attribute and/or the inherited value from the parent 5589 * 5590 * @return true if the layout is right-to-left. 5591 */ 5592 @ViewDebug.ExportedProperty(category = "layout") 5593 public boolean isLayoutRtl() { 5594 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5595 } 5596 5597 /** 5598 * Indicates whether the view is currently tracking transient state that the 5599 * app should not need to concern itself with saving and restoring, but that 5600 * the framework should take special note to preserve when possible. 5601 * 5602 * <p>A view with transient state cannot be trivially rebound from an external 5603 * data source, such as an adapter binding item views in a list. This may be 5604 * because the view is performing an animation, tracking user selection 5605 * of content, or similar.</p> 5606 * 5607 * @return true if the view has transient state 5608 */ 5609 @ViewDebug.ExportedProperty(category = "layout") 5610 public boolean hasTransientState() { 5611 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5612 } 5613 5614 /** 5615 * Set whether this view is currently tracking transient state that the 5616 * framework should attempt to preserve when possible. This flag is reference counted, 5617 * so every call to setHasTransientState(true) should be paired with a later call 5618 * to setHasTransientState(false). 5619 * 5620 * <p>A view with transient state cannot be trivially rebound from an external 5621 * data source, such as an adapter binding item views in a list. This may be 5622 * because the view is performing an animation, tracking user selection 5623 * of content, or similar.</p> 5624 * 5625 * @param hasTransientState true if this view has transient state 5626 */ 5627 public void setHasTransientState(boolean hasTransientState) { 5628 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5629 mTransientStateCount - 1; 5630 if (mTransientStateCount < 0) { 5631 mTransientStateCount = 0; 5632 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5633 "unmatched pair of setHasTransientState calls"); 5634 } 5635 if ((hasTransientState && mTransientStateCount == 1) || 5636 (!hasTransientState && mTransientStateCount == 0)) { 5637 // update flag if we've just incremented up from 0 or decremented down to 0 5638 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5639 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5640 if (mParent != null) { 5641 try { 5642 mParent.childHasTransientStateChanged(this, hasTransientState); 5643 } catch (AbstractMethodError e) { 5644 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5645 " does not fully implement ViewParent", e); 5646 } 5647 } 5648 } 5649 } 5650 5651 /** 5652 * If this view doesn't do any drawing on its own, set this flag to 5653 * allow further optimizations. By default, this flag is not set on 5654 * View, but could be set on some View subclasses such as ViewGroup. 5655 * 5656 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5657 * you should clear this flag. 5658 * 5659 * @param willNotDraw whether or not this View draw on its own 5660 */ 5661 public void setWillNotDraw(boolean willNotDraw) { 5662 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5663 } 5664 5665 /** 5666 * Returns whether or not this View draws on its own. 5667 * 5668 * @return true if this view has nothing to draw, false otherwise 5669 */ 5670 @ViewDebug.ExportedProperty(category = "drawing") 5671 public boolean willNotDraw() { 5672 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5673 } 5674 5675 /** 5676 * When a View's drawing cache is enabled, drawing is redirected to an 5677 * offscreen bitmap. Some views, like an ImageView, must be able to 5678 * bypass this mechanism if they already draw a single bitmap, to avoid 5679 * unnecessary usage of the memory. 5680 * 5681 * @param willNotCacheDrawing true if this view does not cache its 5682 * drawing, false otherwise 5683 */ 5684 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5685 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5686 } 5687 5688 /** 5689 * Returns whether or not this View can cache its drawing or not. 5690 * 5691 * @return true if this view does not cache its drawing, false otherwise 5692 */ 5693 @ViewDebug.ExportedProperty(category = "drawing") 5694 public boolean willNotCacheDrawing() { 5695 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5696 } 5697 5698 /** 5699 * Indicates whether this view reacts to click events or not. 5700 * 5701 * @return true if the view is clickable, false otherwise 5702 * 5703 * @see #setClickable(boolean) 5704 * @attr ref android.R.styleable#View_clickable 5705 */ 5706 @ViewDebug.ExportedProperty 5707 public boolean isClickable() { 5708 return (mViewFlags & CLICKABLE) == CLICKABLE; 5709 } 5710 5711 /** 5712 * Enables or disables click events for this view. When a view 5713 * is clickable it will change its state to "pressed" on every click. 5714 * Subclasses should set the view clickable to visually react to 5715 * user's clicks. 5716 * 5717 * @param clickable true to make the view clickable, false otherwise 5718 * 5719 * @see #isClickable() 5720 * @attr ref android.R.styleable#View_clickable 5721 */ 5722 public void setClickable(boolean clickable) { 5723 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5724 } 5725 5726 /** 5727 * Indicates whether this view reacts to long click events or not. 5728 * 5729 * @return true if the view is long clickable, false otherwise 5730 * 5731 * @see #setLongClickable(boolean) 5732 * @attr ref android.R.styleable#View_longClickable 5733 */ 5734 public boolean isLongClickable() { 5735 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5736 } 5737 5738 /** 5739 * Enables or disables long click events for this view. When a view is long 5740 * clickable it reacts to the user holding down the button for a longer 5741 * duration than a tap. This event can either launch the listener or a 5742 * context menu. 5743 * 5744 * @param longClickable true to make the view long clickable, false otherwise 5745 * @see #isLongClickable() 5746 * @attr ref android.R.styleable#View_longClickable 5747 */ 5748 public void setLongClickable(boolean longClickable) { 5749 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5750 } 5751 5752 /** 5753 * Sets the pressed state for this view. 5754 * 5755 * @see #isClickable() 5756 * @see #setClickable(boolean) 5757 * 5758 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5759 * the View's internal state from a previously set "pressed" state. 5760 */ 5761 public void setPressed(boolean pressed) { 5762 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5763 5764 if (pressed) { 5765 mPrivateFlags |= PRESSED; 5766 } else { 5767 mPrivateFlags &= ~PRESSED; 5768 } 5769 5770 if (needsRefresh) { 5771 refreshDrawableState(); 5772 } 5773 dispatchSetPressed(pressed); 5774 } 5775 5776 /** 5777 * Dispatch setPressed to all of this View's children. 5778 * 5779 * @see #setPressed(boolean) 5780 * 5781 * @param pressed The new pressed state 5782 */ 5783 protected void dispatchSetPressed(boolean pressed) { 5784 } 5785 5786 /** 5787 * Indicates whether the view is currently in pressed state. Unless 5788 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5789 * the pressed state. 5790 * 5791 * @see #setPressed(boolean) 5792 * @see #isClickable() 5793 * @see #setClickable(boolean) 5794 * 5795 * @return true if the view is currently pressed, false otherwise 5796 */ 5797 public boolean isPressed() { 5798 return (mPrivateFlags & PRESSED) == PRESSED; 5799 } 5800 5801 /** 5802 * Indicates whether this view will save its state (that is, 5803 * whether its {@link #onSaveInstanceState} method will be called). 5804 * 5805 * @return Returns true if the view state saving is enabled, else false. 5806 * 5807 * @see #setSaveEnabled(boolean) 5808 * @attr ref android.R.styleable#View_saveEnabled 5809 */ 5810 public boolean isSaveEnabled() { 5811 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5812 } 5813 5814 /** 5815 * Controls whether the saving of this view's state is 5816 * enabled (that is, whether its {@link #onSaveInstanceState} method 5817 * will be called). Note that even if freezing is enabled, the 5818 * view still must have an id assigned to it (via {@link #setId(int)}) 5819 * for its state to be saved. This flag can only disable the 5820 * saving of this view; any child views may still have their state saved. 5821 * 5822 * @param enabled Set to false to <em>disable</em> state saving, or true 5823 * (the default) to allow it. 5824 * 5825 * @see #isSaveEnabled() 5826 * @see #setId(int) 5827 * @see #onSaveInstanceState() 5828 * @attr ref android.R.styleable#View_saveEnabled 5829 */ 5830 public void setSaveEnabled(boolean enabled) { 5831 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5832 } 5833 5834 /** 5835 * Gets whether the framework should discard touches when the view's 5836 * window is obscured by another visible window. 5837 * Refer to the {@link View} security documentation for more details. 5838 * 5839 * @return True if touch filtering is enabled. 5840 * 5841 * @see #setFilterTouchesWhenObscured(boolean) 5842 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5843 */ 5844 @ViewDebug.ExportedProperty 5845 public boolean getFilterTouchesWhenObscured() { 5846 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5847 } 5848 5849 /** 5850 * Sets whether the framework should discard touches when the view's 5851 * window is obscured by another visible window. 5852 * Refer to the {@link View} security documentation for more details. 5853 * 5854 * @param enabled True if touch filtering should be enabled. 5855 * 5856 * @see #getFilterTouchesWhenObscured 5857 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5858 */ 5859 public void setFilterTouchesWhenObscured(boolean enabled) { 5860 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5861 FILTER_TOUCHES_WHEN_OBSCURED); 5862 } 5863 5864 /** 5865 * Indicates whether the entire hierarchy under this view will save its 5866 * state when a state saving traversal occurs from its parent. The default 5867 * is true; if false, these views will not be saved unless 5868 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5869 * 5870 * @return Returns true if the view state saving from parent is enabled, else false. 5871 * 5872 * @see #setSaveFromParentEnabled(boolean) 5873 */ 5874 public boolean isSaveFromParentEnabled() { 5875 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5876 } 5877 5878 /** 5879 * Controls whether the entire hierarchy under this view will save its 5880 * state when a state saving traversal occurs from its parent. The default 5881 * is true; if false, these views will not be saved unless 5882 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5883 * 5884 * @param enabled Set to false to <em>disable</em> state saving, or true 5885 * (the default) to allow it. 5886 * 5887 * @see #isSaveFromParentEnabled() 5888 * @see #setId(int) 5889 * @see #onSaveInstanceState() 5890 */ 5891 public void setSaveFromParentEnabled(boolean enabled) { 5892 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5893 } 5894 5895 5896 /** 5897 * Returns whether this View is able to take focus. 5898 * 5899 * @return True if this view can take focus, or false otherwise. 5900 * @attr ref android.R.styleable#View_focusable 5901 */ 5902 @ViewDebug.ExportedProperty(category = "focus") 5903 public final boolean isFocusable() { 5904 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5905 } 5906 5907 /** 5908 * When a view is focusable, it may not want to take focus when in touch mode. 5909 * For example, a button would like focus when the user is navigating via a D-pad 5910 * so that the user can click on it, but once the user starts touching the screen, 5911 * the button shouldn't take focus 5912 * @return Whether the view is focusable in touch mode. 5913 * @attr ref android.R.styleable#View_focusableInTouchMode 5914 */ 5915 @ViewDebug.ExportedProperty 5916 public final boolean isFocusableInTouchMode() { 5917 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5918 } 5919 5920 /** 5921 * Find the nearest view in the specified direction that can take focus. 5922 * This does not actually give focus to that view. 5923 * 5924 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5925 * 5926 * @return The nearest focusable in the specified direction, or null if none 5927 * can be found. 5928 */ 5929 public View focusSearch(int direction) { 5930 if (mParent != null) { 5931 return mParent.focusSearch(this, direction); 5932 } else { 5933 return null; 5934 } 5935 } 5936 5937 /** 5938 * This method is the last chance for the focused view and its ancestors to 5939 * respond to an arrow key. This is called when the focused view did not 5940 * consume the key internally, nor could the view system find a new view in 5941 * the requested direction to give focus to. 5942 * 5943 * @param focused The currently focused view. 5944 * @param direction The direction focus wants to move. One of FOCUS_UP, 5945 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5946 * @return True if the this view consumed this unhandled move. 5947 */ 5948 public boolean dispatchUnhandledMove(View focused, int direction) { 5949 return false; 5950 } 5951 5952 /** 5953 * If a user manually specified the next view id for a particular direction, 5954 * use the root to look up the view. 5955 * @param root The root view of the hierarchy containing this view. 5956 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5957 * or FOCUS_BACKWARD. 5958 * @return The user specified next view, or null if there is none. 5959 */ 5960 View findUserSetNextFocus(View root, int direction) { 5961 switch (direction) { 5962 case FOCUS_LEFT: 5963 if (mNextFocusLeftId == View.NO_ID) return null; 5964 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5965 case FOCUS_RIGHT: 5966 if (mNextFocusRightId == View.NO_ID) return null; 5967 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5968 case FOCUS_UP: 5969 if (mNextFocusUpId == View.NO_ID) return null; 5970 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5971 case FOCUS_DOWN: 5972 if (mNextFocusDownId == View.NO_ID) return null; 5973 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5974 case FOCUS_FORWARD: 5975 if (mNextFocusForwardId == View.NO_ID) return null; 5976 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5977 case FOCUS_BACKWARD: { 5978 if (mID == View.NO_ID) return null; 5979 final int id = mID; 5980 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5981 @Override 5982 public boolean apply(View t) { 5983 return t.mNextFocusForwardId == id; 5984 } 5985 }); 5986 } 5987 } 5988 return null; 5989 } 5990 5991 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5992 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5993 @Override 5994 public boolean apply(View t) { 5995 return t.mID == childViewId; 5996 } 5997 }); 5998 5999 if (result == null) { 6000 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 6001 + "by user for id " + childViewId); 6002 } 6003 return result; 6004 } 6005 6006 /** 6007 * Find and return all focusable views that are descendants of this view, 6008 * possibly including this view if it is focusable itself. 6009 * 6010 * @param direction The direction of the focus 6011 * @return A list of focusable views 6012 */ 6013 public ArrayList<View> getFocusables(int direction) { 6014 ArrayList<View> result = new ArrayList<View>(24); 6015 addFocusables(result, direction); 6016 return result; 6017 } 6018 6019 /** 6020 * Add any focusable views that are descendants of this view (possibly 6021 * including this view if it is focusable itself) to views. If we are in touch mode, 6022 * only add views that are also focusable in touch mode. 6023 * 6024 * @param views Focusable views found so far 6025 * @param direction The direction of the focus 6026 */ 6027 public void addFocusables(ArrayList<View> views, int direction) { 6028 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6029 } 6030 6031 /** 6032 * Adds any focusable views that are descendants of this view (possibly 6033 * including this view if it is focusable itself) to views. This method 6034 * adds all focusable views regardless if we are in touch mode or 6035 * only views focusable in touch mode if we are in touch mode or 6036 * only views that can take accessibility focus if accessibility is enabeld 6037 * depending on the focusable mode paramater. 6038 * 6039 * @param views Focusable views found so far or null if all we are interested is 6040 * the number of focusables. 6041 * @param direction The direction of the focus. 6042 * @param focusableMode The type of focusables to be added. 6043 * 6044 * @see #FOCUSABLES_ALL 6045 * @see #FOCUSABLES_TOUCH_MODE 6046 */ 6047 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6048 if (views == null) { 6049 return; 6050 } 6051 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6052 if (canTakeAccessibilityFocusFromHover() || getAccessibilityNodeProvider() != null) { 6053 views.add(this); 6054 return; 6055 } 6056 } 6057 if (!isFocusable()) { 6058 return; 6059 } 6060 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6061 && isInTouchMode() && !isFocusableInTouchMode()) { 6062 return; 6063 } 6064 views.add(this); 6065 } 6066 6067 /** 6068 * Finds the Views that contain given text. The containment is case insensitive. 6069 * The search is performed by either the text that the View renders or the content 6070 * description that describes the view for accessibility purposes and the view does 6071 * not render or both. Clients can specify how the search is to be performed via 6072 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6073 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6074 * 6075 * @param outViews The output list of matching Views. 6076 * @param searched The text to match against. 6077 * 6078 * @see #FIND_VIEWS_WITH_TEXT 6079 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6080 * @see #setContentDescription(CharSequence) 6081 */ 6082 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6083 if (getAccessibilityNodeProvider() != null) { 6084 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6085 outViews.add(this); 6086 } 6087 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6088 && (searched != null && searched.length() > 0) 6089 && (mContentDescription != null && mContentDescription.length() > 0)) { 6090 String searchedLowerCase = searched.toString().toLowerCase(); 6091 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6092 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6093 outViews.add(this); 6094 } 6095 } 6096 } 6097 6098 /** 6099 * Find and return all touchable views that are descendants of this view, 6100 * possibly including this view if it is touchable itself. 6101 * 6102 * @return A list of touchable views 6103 */ 6104 public ArrayList<View> getTouchables() { 6105 ArrayList<View> result = new ArrayList<View>(); 6106 addTouchables(result); 6107 return result; 6108 } 6109 6110 /** 6111 * Add any touchable views that are descendants of this view (possibly 6112 * including this view if it is touchable itself) to views. 6113 * 6114 * @param views Touchable views found so far 6115 */ 6116 public void addTouchables(ArrayList<View> views) { 6117 final int viewFlags = mViewFlags; 6118 6119 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6120 && (viewFlags & ENABLED_MASK) == ENABLED) { 6121 views.add(this); 6122 } 6123 } 6124 6125 /** 6126 * Returns whether this View is accessibility focused. 6127 * 6128 * @return True if this View is accessibility focused. 6129 */ 6130 boolean isAccessibilityFocused() { 6131 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6132 } 6133 6134 /** 6135 * Call this to try to give accessibility focus to this view. 6136 * 6137 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6138 * returns false or the view is no visible or the view already has accessibility 6139 * focus. 6140 * 6141 * See also {@link #focusSearch(int)}, which is what you call to say that you 6142 * have focus, and you want your parent to look for the next one. 6143 * 6144 * @return Whether this view actually took accessibility focus. 6145 * 6146 * @hide 6147 */ 6148 public boolean requestAccessibilityFocus() { 6149 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6150 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6151 return false; 6152 } 6153 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6154 return false; 6155 } 6156 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6157 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6158 ViewRootImpl viewRootImpl = getViewRootImpl(); 6159 if (viewRootImpl != null) { 6160 viewRootImpl.setAccessibilityFocusedHost(this); 6161 } 6162 invalidate(); 6163 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6164 notifyAccessibilityStateChanged(); 6165 return true; 6166 } 6167 return false; 6168 } 6169 6170 /** 6171 * Call this to try to clear accessibility focus of this view. 6172 * 6173 * See also {@link #focusSearch(int)}, which is what you call to say that you 6174 * have focus, and you want your parent to look for the next one. 6175 * 6176 * @hide 6177 */ 6178 public void clearAccessibilityFocus() { 6179 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6180 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6181 invalidate(); 6182 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6183 notifyAccessibilityStateChanged(); 6184 // Clear the text navigation state. 6185 setAccessibilityCursorPosition(-1); 6186 } 6187 // Clear the global reference of accessibility focus if this 6188 // view or any of its descendants had accessibility focus. 6189 ViewRootImpl viewRootImpl = getViewRootImpl(); 6190 if (viewRootImpl != null) { 6191 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6192 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6193 viewRootImpl.setAccessibilityFocusedHost(null); 6194 } 6195 } 6196 } 6197 6198 private void requestAccessibilityFocusFromHover() { 6199 if (includeForAccessibility() && isActionableForAccessibility()) { 6200 requestAccessibilityFocus(); 6201 requestFocusNoSearch(View.FOCUS_DOWN, null); 6202 } else { 6203 if (mParent != null) { 6204 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6205 if (nextFocus != null) { 6206 nextFocus.requestAccessibilityFocus(); 6207 nextFocus.requestFocusNoSearch(View.FOCUS_DOWN, null); 6208 } 6209 } 6210 } 6211 } 6212 6213 /** 6214 * @hide 6215 */ 6216 public boolean canTakeAccessibilityFocusFromHover() { 6217 if (includeForAccessibility() && isActionableForAccessibility()) { 6218 return true; 6219 } 6220 if (mParent != null) { 6221 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6222 } 6223 return false; 6224 } 6225 6226 /** 6227 * Clears accessibility focus without calling any callback methods 6228 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6229 * is used for clearing accessibility focus when giving this focus to 6230 * another view. 6231 */ 6232 void clearAccessibilityFocusNoCallbacks() { 6233 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6234 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6235 invalidate(); 6236 } 6237 } 6238 6239 /** 6240 * Call this to try to give focus to a specific view or to one of its 6241 * descendants. 6242 * 6243 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6244 * false), or if it is focusable and it is not focusable in touch mode 6245 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6246 * 6247 * See also {@link #focusSearch(int)}, which is what you call to say that you 6248 * have focus, and you want your parent to look for the next one. 6249 * 6250 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6251 * {@link #FOCUS_DOWN} and <code>null</code>. 6252 * 6253 * @return Whether this view or one of its descendants actually took focus. 6254 */ 6255 public final boolean requestFocus() { 6256 return requestFocus(View.FOCUS_DOWN); 6257 } 6258 6259 /** 6260 * Call this to try to give focus to a specific view or to one of its 6261 * descendants and give it a hint about what direction focus is heading. 6262 * 6263 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6264 * false), or if it is focusable and it is not focusable in touch mode 6265 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6266 * 6267 * See also {@link #focusSearch(int)}, which is what you call to say that you 6268 * have focus, and you want your parent to look for the next one. 6269 * 6270 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6271 * <code>null</code> set for the previously focused rectangle. 6272 * 6273 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6274 * @return Whether this view or one of its descendants actually took focus. 6275 */ 6276 public final boolean requestFocus(int direction) { 6277 return requestFocus(direction, null); 6278 } 6279 6280 /** 6281 * Call this to try to give focus to a specific view or to one of its descendants 6282 * and give it hints about the direction and a specific rectangle that the focus 6283 * is coming from. The rectangle can help give larger views a finer grained hint 6284 * about where focus is coming from, and therefore, where to show selection, or 6285 * forward focus change internally. 6286 * 6287 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6288 * false), or if it is focusable and it is not focusable in touch mode 6289 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6290 * 6291 * A View will not take focus if it is not visible. 6292 * 6293 * A View will not take focus if one of its parents has 6294 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6295 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6296 * 6297 * See also {@link #focusSearch(int)}, which is what you call to say that you 6298 * have focus, and you want your parent to look for the next one. 6299 * 6300 * You may wish to override this method if your custom {@link View} has an internal 6301 * {@link View} that it wishes to forward the request to. 6302 * 6303 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6304 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6305 * to give a finer grained hint about where focus is coming from. May be null 6306 * if there is no hint. 6307 * @return Whether this view or one of its descendants actually took focus. 6308 */ 6309 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6310 return requestFocusNoSearch(direction, previouslyFocusedRect); 6311 } 6312 6313 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6314 // need to be focusable 6315 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6316 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6317 return false; 6318 } 6319 6320 // need to be focusable in touch mode if in touch mode 6321 if (isInTouchMode() && 6322 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6323 return false; 6324 } 6325 6326 // need to not have any parents blocking us 6327 if (hasAncestorThatBlocksDescendantFocus()) { 6328 return false; 6329 } 6330 6331 handleFocusGainInternal(direction, previouslyFocusedRect); 6332 return true; 6333 } 6334 6335 /** 6336 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6337 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6338 * touch mode to request focus when they are touched. 6339 * 6340 * @return Whether this view or one of its descendants actually took focus. 6341 * 6342 * @see #isInTouchMode() 6343 * 6344 */ 6345 public final boolean requestFocusFromTouch() { 6346 // Leave touch mode if we need to 6347 if (isInTouchMode()) { 6348 ViewRootImpl viewRoot = getViewRootImpl(); 6349 if (viewRoot != null) { 6350 viewRoot.ensureTouchMode(false); 6351 } 6352 } 6353 return requestFocus(View.FOCUS_DOWN); 6354 } 6355 6356 /** 6357 * @return Whether any ancestor of this view blocks descendant focus. 6358 */ 6359 private boolean hasAncestorThatBlocksDescendantFocus() { 6360 ViewParent ancestor = mParent; 6361 while (ancestor instanceof ViewGroup) { 6362 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6363 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6364 return true; 6365 } else { 6366 ancestor = vgAncestor.getParent(); 6367 } 6368 } 6369 return false; 6370 } 6371 6372 /** 6373 * Gets the mode for determining whether this View is important for accessibility 6374 * which is if it fires accessibility events and if it is reported to 6375 * accessibility services that query the screen. 6376 * 6377 * @return The mode for determining whether a View is important for accessibility. 6378 * 6379 * @attr ref android.R.styleable#View_importantForAccessibility 6380 * 6381 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6382 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6383 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6384 */ 6385 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6386 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6387 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6388 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6389 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6390 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6391 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6392 }) 6393 public int getImportantForAccessibility() { 6394 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6395 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6396 } 6397 6398 /** 6399 * Sets how to determine whether this view is important for accessibility 6400 * which is if it fires accessibility events and if it is reported to 6401 * accessibility services that query the screen. 6402 * 6403 * @param mode How to determine whether this view is important for accessibility. 6404 * 6405 * @attr ref android.R.styleable#View_importantForAccessibility 6406 * 6407 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6408 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6409 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6410 */ 6411 public void setImportantForAccessibility(int mode) { 6412 if (mode != getImportantForAccessibility()) { 6413 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6414 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6415 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6416 notifyAccessibilityStateChanged(); 6417 } 6418 } 6419 6420 /** 6421 * Gets whether this view should be exposed for accessibility. 6422 * 6423 * @return Whether the view is exposed for accessibility. 6424 * 6425 * @hide 6426 */ 6427 public boolean isImportantForAccessibility() { 6428 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6429 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6430 switch (mode) { 6431 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6432 return true; 6433 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6434 return false; 6435 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6436 return isActionableForAccessibility() || hasListenersForAccessibility(); 6437 default: 6438 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6439 + mode); 6440 } 6441 } 6442 6443 /** 6444 * Gets the parent for accessibility purposes. Note that the parent for 6445 * accessibility is not necessary the immediate parent. It is the first 6446 * predecessor that is important for accessibility. 6447 * 6448 * @return The parent for accessibility purposes. 6449 */ 6450 public ViewParent getParentForAccessibility() { 6451 if (mParent instanceof View) { 6452 View parentView = (View) mParent; 6453 if (parentView.includeForAccessibility()) { 6454 return mParent; 6455 } else { 6456 return mParent.getParentForAccessibility(); 6457 } 6458 } 6459 return null; 6460 } 6461 6462 /** 6463 * Adds the children of a given View for accessibility. Since some Views are 6464 * not important for accessibility the children for accessibility are not 6465 * necessarily direct children of the riew, rather they are the first level of 6466 * descendants important for accessibility. 6467 * 6468 * @param children The list of children for accessibility. 6469 */ 6470 public void addChildrenForAccessibility(ArrayList<View> children) { 6471 if (includeForAccessibility()) { 6472 children.add(this); 6473 } 6474 } 6475 6476 /** 6477 * Whether to regard this view for accessibility. A view is regarded for 6478 * accessibility if it is important for accessibility or the querying 6479 * accessibility service has explicitly requested that view not 6480 * important for accessibility are regarded. 6481 * 6482 * @return Whether to regard the view for accessibility. 6483 * 6484 * @hide 6485 */ 6486 public boolean includeForAccessibility() { 6487 if (mAttachInfo != null) { 6488 if (!mAttachInfo.mIncludeNotImportantViews) { 6489 return isImportantForAccessibility(); 6490 } 6491 return true; 6492 } 6493 return false; 6494 } 6495 6496 /** 6497 * Returns whether the View is considered actionable from 6498 * accessibility perspective. Such view are important for 6499 * accessiiblity. 6500 * 6501 * @return True if the view is actionable for accessibility. 6502 * 6503 * @hide 6504 */ 6505 public boolean isActionableForAccessibility() { 6506 return (isClickable() || isLongClickable() || isFocusable()); 6507 } 6508 6509 /** 6510 * Returns whether the View has registered callbacks wich makes it 6511 * important for accessiiblity. 6512 * 6513 * @return True if the view is actionable for accessibility. 6514 */ 6515 private boolean hasListenersForAccessibility() { 6516 ListenerInfo info = getListenerInfo(); 6517 return mTouchDelegate != null || info.mOnKeyListener != null 6518 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6519 || info.mOnHoverListener != null || info.mOnDragListener != null; 6520 } 6521 6522 /** 6523 * Notifies accessibility services that some view's important for 6524 * accessibility state has changed. Note that such notifications 6525 * are made at most once every 6526 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6527 * to avoid unnecessary load to the system. Also once a view has 6528 * made a notifucation this method is a NOP until the notification has 6529 * been sent to clients. 6530 * 6531 * @hide 6532 * 6533 * TODO: Makse sure this method is called for any view state change 6534 * that is interesting for accessilility purposes. 6535 */ 6536 public void notifyAccessibilityStateChanged() { 6537 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6538 return; 6539 } 6540 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6541 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6542 if (mParent != null) { 6543 mParent.childAccessibilityStateChanged(this); 6544 } 6545 } 6546 } 6547 6548 /** 6549 * Reset the state indicating the this view has requested clients 6550 * interested in its accessiblity state to be notified. 6551 * 6552 * @hide 6553 */ 6554 public void resetAccessibilityStateChanged() { 6555 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6556 } 6557 6558 /** 6559 * Performs the specified accessibility action on the view. For 6560 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6561 * <p> 6562 * If an {@link AccessibilityDelegate} has been specified via calling 6563 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6564 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6565 * is responsible for handling this call. 6566 * </p> 6567 * 6568 * @param action The action to perform. 6569 * @param arguments Optional action arguments. 6570 * @return Whether the action was performed. 6571 */ 6572 public boolean performAccessibilityAction(int action, Bundle arguments) { 6573 if (mAccessibilityDelegate != null) { 6574 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6575 } else { 6576 return performAccessibilityActionInternal(action, arguments); 6577 } 6578 } 6579 6580 /** 6581 * @see #performAccessibilityAction(int, Bundle) 6582 * 6583 * Note: Called from the default {@link AccessibilityDelegate}. 6584 */ 6585 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6586 switch (action) { 6587 case AccessibilityNodeInfo.ACTION_CLICK: { 6588 if (isClickable()) { 6589 return performClick(); 6590 } 6591 } break; 6592 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6593 if (isLongClickable()) { 6594 return performLongClick(); 6595 } 6596 } break; 6597 case AccessibilityNodeInfo.ACTION_FOCUS: { 6598 if (!hasFocus()) { 6599 // Get out of touch mode since accessibility 6600 // wants to move focus around. 6601 getViewRootImpl().ensureTouchMode(false); 6602 return requestFocus(); 6603 } 6604 } break; 6605 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6606 if (hasFocus()) { 6607 clearFocus(); 6608 return !isFocused(); 6609 } 6610 } break; 6611 case AccessibilityNodeInfo.ACTION_SELECT: { 6612 if (!isSelected()) { 6613 setSelected(true); 6614 return isSelected(); 6615 } 6616 } break; 6617 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6618 if (isSelected()) { 6619 setSelected(false); 6620 return !isSelected(); 6621 } 6622 } break; 6623 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6624 if (!isAccessibilityFocused()) { 6625 return requestAccessibilityFocus(); 6626 } 6627 } break; 6628 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6629 if (isAccessibilityFocused()) { 6630 clearAccessibilityFocus(); 6631 return true; 6632 } 6633 } break; 6634 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6635 if (arguments != null) { 6636 final int granularity = arguments.getInt( 6637 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6638 return nextAtGranularity(granularity); 6639 } 6640 } break; 6641 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6642 if (arguments != null) { 6643 final int granularity = arguments.getInt( 6644 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6645 return previousAtGranularity(granularity); 6646 } 6647 } break; 6648 } 6649 return false; 6650 } 6651 6652 private boolean nextAtGranularity(int granularity) { 6653 CharSequence text = getIterableTextForAccessibility(); 6654 if (text == null || text.length() == 0) { 6655 return false; 6656 } 6657 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6658 if (iterator == null) { 6659 return false; 6660 } 6661 final int current = getAccessibilityCursorPosition(); 6662 final int[] range = iterator.following(current); 6663 if (range == null) { 6664 setAccessibilityCursorPosition(-1); 6665 return false; 6666 } 6667 final int start = range[0]; 6668 final int end = range[1]; 6669 setAccessibilityCursorPosition(start); 6670 sendViewTextTraversedAtGranularityEvent( 6671 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6672 granularity, start, end); 6673 return true; 6674 } 6675 6676 private boolean previousAtGranularity(int granularity) { 6677 CharSequence text = getIterableTextForAccessibility(); 6678 if (text == null || text.length() == 0) { 6679 return false; 6680 } 6681 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6682 if (iterator == null) { 6683 return false; 6684 } 6685 final int selectionStart = getAccessibilityCursorPosition(); 6686 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6687 final int[] range = iterator.preceding(current); 6688 if (range == null) { 6689 setAccessibilityCursorPosition(-1); 6690 return false; 6691 } 6692 final int start = range[0]; 6693 final int end = range[1]; 6694 setAccessibilityCursorPosition(end); 6695 sendViewTextTraversedAtGranularityEvent( 6696 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6697 granularity, start, end); 6698 return true; 6699 } 6700 6701 /** 6702 * Gets the text reported for accessibility purposes. 6703 * 6704 * @return The accessibility text. 6705 * 6706 * @hide 6707 */ 6708 public CharSequence getIterableTextForAccessibility() { 6709 return mContentDescription; 6710 } 6711 6712 /** 6713 * @hide 6714 */ 6715 public int getAccessibilityCursorPosition() { 6716 return mAccessibilityCursorPosition; 6717 } 6718 6719 /** 6720 * @hide 6721 */ 6722 public void setAccessibilityCursorPosition(int position) { 6723 mAccessibilityCursorPosition = position; 6724 } 6725 6726 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6727 int fromIndex, int toIndex) { 6728 if (mParent == null) { 6729 return; 6730 } 6731 AccessibilityEvent event = AccessibilityEvent.obtain( 6732 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6733 onInitializeAccessibilityEvent(event); 6734 onPopulateAccessibilityEvent(event); 6735 event.setFromIndex(fromIndex); 6736 event.setToIndex(toIndex); 6737 event.setAction(action); 6738 event.setMovementGranularity(granularity); 6739 mParent.requestSendAccessibilityEvent(this, event); 6740 } 6741 6742 /** 6743 * @hide 6744 */ 6745 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6746 switch (granularity) { 6747 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6748 CharSequence text = getIterableTextForAccessibility(); 6749 if (text != null && text.length() > 0) { 6750 CharacterTextSegmentIterator iterator = 6751 CharacterTextSegmentIterator.getInstance(mContext); 6752 iterator.initialize(text.toString()); 6753 return iterator; 6754 } 6755 } break; 6756 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6757 CharSequence text = getIterableTextForAccessibility(); 6758 if (text != null && text.length() > 0) { 6759 WordTextSegmentIterator iterator = 6760 WordTextSegmentIterator.getInstance(mContext); 6761 iterator.initialize(text.toString()); 6762 return iterator; 6763 } 6764 } break; 6765 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6766 CharSequence text = getIterableTextForAccessibility(); 6767 if (text != null && text.length() > 0) { 6768 ParagraphTextSegmentIterator iterator = 6769 ParagraphTextSegmentIterator.getInstance(); 6770 iterator.initialize(text.toString()); 6771 return iterator; 6772 } 6773 } break; 6774 } 6775 return null; 6776 } 6777 6778 /** 6779 * @hide 6780 */ 6781 public void dispatchStartTemporaryDetach() { 6782 clearAccessibilityFocus(); 6783 onStartTemporaryDetach(); 6784 } 6785 6786 /** 6787 * This is called when a container is going to temporarily detach a child, with 6788 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6789 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6790 * {@link #onDetachedFromWindow()} when the container is done. 6791 */ 6792 public void onStartTemporaryDetach() { 6793 removeUnsetPressCallback(); 6794 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6795 } 6796 6797 /** 6798 * @hide 6799 */ 6800 public void dispatchFinishTemporaryDetach() { 6801 onFinishTemporaryDetach(); 6802 } 6803 6804 /** 6805 * Called after {@link #onStartTemporaryDetach} when the container is done 6806 * changing the view. 6807 */ 6808 public void onFinishTemporaryDetach() { 6809 } 6810 6811 /** 6812 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6813 * for this view's window. Returns null if the view is not currently attached 6814 * to the window. Normally you will not need to use this directly, but 6815 * just use the standard high-level event callbacks like 6816 * {@link #onKeyDown(int, KeyEvent)}. 6817 */ 6818 public KeyEvent.DispatcherState getKeyDispatcherState() { 6819 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6820 } 6821 6822 /** 6823 * Dispatch a key event before it is processed by any input method 6824 * associated with the view hierarchy. This can be used to intercept 6825 * key events in special situations before the IME consumes them; a 6826 * typical example would be handling the BACK key to update the application's 6827 * UI instead of allowing the IME to see it and close itself. 6828 * 6829 * @param event The key event to be dispatched. 6830 * @return True if the event was handled, false otherwise. 6831 */ 6832 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6833 return onKeyPreIme(event.getKeyCode(), event); 6834 } 6835 6836 /** 6837 * Dispatch a key event to the next view on the focus path. This path runs 6838 * from the top of the view tree down to the currently focused view. If this 6839 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6840 * the next node down the focus path. This method also fires any key 6841 * listeners. 6842 * 6843 * @param event The key event to be dispatched. 6844 * @return True if the event was handled, false otherwise. 6845 */ 6846 public boolean dispatchKeyEvent(KeyEvent event) { 6847 if (mInputEventConsistencyVerifier != null) { 6848 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6849 } 6850 6851 // Give any attached key listener a first crack at the event. 6852 //noinspection SimplifiableIfStatement 6853 ListenerInfo li = mListenerInfo; 6854 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6855 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6856 return true; 6857 } 6858 6859 if (event.dispatch(this, mAttachInfo != null 6860 ? mAttachInfo.mKeyDispatchState : null, this)) { 6861 return true; 6862 } 6863 6864 if (mInputEventConsistencyVerifier != null) { 6865 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6866 } 6867 return false; 6868 } 6869 6870 /** 6871 * Dispatches a key shortcut event. 6872 * 6873 * @param event The key event to be dispatched. 6874 * @return True if the event was handled by the view, false otherwise. 6875 */ 6876 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6877 return onKeyShortcut(event.getKeyCode(), event); 6878 } 6879 6880 /** 6881 * Pass the touch screen motion event down to the target view, or this 6882 * view if it is the target. 6883 * 6884 * @param event The motion event to be dispatched. 6885 * @return True if the event was handled by the view, false otherwise. 6886 */ 6887 public boolean dispatchTouchEvent(MotionEvent event) { 6888 if (mInputEventConsistencyVerifier != null) { 6889 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6890 } 6891 6892 if (onFilterTouchEventForSecurity(event)) { 6893 //noinspection SimplifiableIfStatement 6894 ListenerInfo li = mListenerInfo; 6895 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6896 && li.mOnTouchListener.onTouch(this, event)) { 6897 return true; 6898 } 6899 6900 if (onTouchEvent(event)) { 6901 return true; 6902 } 6903 } 6904 6905 if (mInputEventConsistencyVerifier != null) { 6906 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6907 } 6908 return false; 6909 } 6910 6911 /** 6912 * Filter the touch event to apply security policies. 6913 * 6914 * @param event The motion event to be filtered. 6915 * @return True if the event should be dispatched, false if the event should be dropped. 6916 * 6917 * @see #getFilterTouchesWhenObscured 6918 */ 6919 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6920 //noinspection RedundantIfStatement 6921 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6922 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6923 // Window is obscured, drop this touch. 6924 return false; 6925 } 6926 return true; 6927 } 6928 6929 /** 6930 * Pass a trackball motion event down to the focused view. 6931 * 6932 * @param event The motion event to be dispatched. 6933 * @return True if the event was handled by the view, false otherwise. 6934 */ 6935 public boolean dispatchTrackballEvent(MotionEvent event) { 6936 if (mInputEventConsistencyVerifier != null) { 6937 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6938 } 6939 6940 return onTrackballEvent(event); 6941 } 6942 6943 /** 6944 * Dispatch a generic motion event. 6945 * <p> 6946 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6947 * are delivered to the view under the pointer. All other generic motion events are 6948 * delivered to the focused view. Hover events are handled specially and are delivered 6949 * to {@link #onHoverEvent(MotionEvent)}. 6950 * </p> 6951 * 6952 * @param event The motion event to be dispatched. 6953 * @return True if the event was handled by the view, false otherwise. 6954 */ 6955 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6956 if (mInputEventConsistencyVerifier != null) { 6957 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6958 } 6959 6960 final int source = event.getSource(); 6961 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6962 final int action = event.getAction(); 6963 if (action == MotionEvent.ACTION_HOVER_ENTER 6964 || action == MotionEvent.ACTION_HOVER_MOVE 6965 || action == MotionEvent.ACTION_HOVER_EXIT) { 6966 if (dispatchHoverEvent(event)) { 6967 return true; 6968 } 6969 } else if (dispatchGenericPointerEvent(event)) { 6970 return true; 6971 } 6972 } else if (dispatchGenericFocusedEvent(event)) { 6973 return true; 6974 } 6975 6976 if (dispatchGenericMotionEventInternal(event)) { 6977 return true; 6978 } 6979 6980 if (mInputEventConsistencyVerifier != null) { 6981 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6982 } 6983 return false; 6984 } 6985 6986 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6987 //noinspection SimplifiableIfStatement 6988 ListenerInfo li = mListenerInfo; 6989 if (li != null && li.mOnGenericMotionListener != null 6990 && (mViewFlags & ENABLED_MASK) == ENABLED 6991 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6992 return true; 6993 } 6994 6995 if (onGenericMotionEvent(event)) { 6996 return true; 6997 } 6998 6999 if (mInputEventConsistencyVerifier != null) { 7000 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7001 } 7002 return false; 7003 } 7004 7005 /** 7006 * Dispatch a hover event. 7007 * <p> 7008 * Do not call this method directly. 7009 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7010 * </p> 7011 * 7012 * @param event The motion event to be dispatched. 7013 * @return True if the event was handled by the view, false otherwise. 7014 */ 7015 protected boolean dispatchHoverEvent(MotionEvent event) { 7016 //noinspection SimplifiableIfStatement 7017 ListenerInfo li = mListenerInfo; 7018 if (li != null && li.mOnHoverListener != null 7019 && (mViewFlags & ENABLED_MASK) == ENABLED 7020 && li.mOnHoverListener.onHover(this, event)) { 7021 return true; 7022 } 7023 7024 return onHoverEvent(event); 7025 } 7026 7027 /** 7028 * Returns true if the view has a child to which it has recently sent 7029 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7030 * it does not have a hovered child, then it must be the innermost hovered view. 7031 * @hide 7032 */ 7033 protected boolean hasHoveredChild() { 7034 return false; 7035 } 7036 7037 /** 7038 * Dispatch a generic motion event to the view under the first pointer. 7039 * <p> 7040 * Do not call this method directly. 7041 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7042 * </p> 7043 * 7044 * @param event The motion event to be dispatched. 7045 * @return True if the event was handled by the view, false otherwise. 7046 */ 7047 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7048 return false; 7049 } 7050 7051 /** 7052 * Dispatch a generic motion event to the currently focused view. 7053 * <p> 7054 * Do not call this method directly. 7055 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7056 * </p> 7057 * 7058 * @param event The motion event to be dispatched. 7059 * @return True if the event was handled by the view, false otherwise. 7060 */ 7061 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7062 return false; 7063 } 7064 7065 /** 7066 * Dispatch a pointer event. 7067 * <p> 7068 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7069 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7070 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7071 * and should not be expected to handle other pointing device features. 7072 * </p> 7073 * 7074 * @param event The motion event to be dispatched. 7075 * @return True if the event was handled by the view, false otherwise. 7076 * @hide 7077 */ 7078 public final boolean dispatchPointerEvent(MotionEvent event) { 7079 if (event.isTouchEvent()) { 7080 return dispatchTouchEvent(event); 7081 } else { 7082 return dispatchGenericMotionEvent(event); 7083 } 7084 } 7085 7086 /** 7087 * Called when the window containing this view gains or loses window focus. 7088 * ViewGroups should override to route to their children. 7089 * 7090 * @param hasFocus True if the window containing this view now has focus, 7091 * false otherwise. 7092 */ 7093 public void dispatchWindowFocusChanged(boolean hasFocus) { 7094 onWindowFocusChanged(hasFocus); 7095 } 7096 7097 /** 7098 * Called when the window containing this view gains or loses focus. Note 7099 * that this is separate from view focus: to receive key events, both 7100 * your view and its window must have focus. If a window is displayed 7101 * on top of yours that takes input focus, then your own window will lose 7102 * focus but the view focus will remain unchanged. 7103 * 7104 * @param hasWindowFocus True if the window containing this view now has 7105 * focus, false otherwise. 7106 */ 7107 public void onWindowFocusChanged(boolean hasWindowFocus) { 7108 InputMethodManager imm = InputMethodManager.peekInstance(); 7109 if (!hasWindowFocus) { 7110 if (isPressed()) { 7111 setPressed(false); 7112 } 7113 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7114 imm.focusOut(this); 7115 } 7116 removeLongPressCallback(); 7117 removeTapCallback(); 7118 onFocusLost(); 7119 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7120 imm.focusIn(this); 7121 } 7122 refreshDrawableState(); 7123 } 7124 7125 /** 7126 * Returns true if this view is in a window that currently has window focus. 7127 * Note that this is not the same as the view itself having focus. 7128 * 7129 * @return True if this view is in a window that currently has window focus. 7130 */ 7131 public boolean hasWindowFocus() { 7132 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7133 } 7134 7135 /** 7136 * Dispatch a view visibility change down the view hierarchy. 7137 * ViewGroups should override to route to their children. 7138 * @param changedView The view whose visibility changed. Could be 'this' or 7139 * an ancestor view. 7140 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7141 * {@link #INVISIBLE} or {@link #GONE}. 7142 */ 7143 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7144 onVisibilityChanged(changedView, visibility); 7145 } 7146 7147 /** 7148 * Called when the visibility of the view or an ancestor of the view is changed. 7149 * @param changedView The view whose visibility changed. Could be 'this' or 7150 * an ancestor view. 7151 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7152 * {@link #INVISIBLE} or {@link #GONE}. 7153 */ 7154 protected void onVisibilityChanged(View changedView, int visibility) { 7155 if (visibility == VISIBLE) { 7156 if (mAttachInfo != null) { 7157 initialAwakenScrollBars(); 7158 } else { 7159 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7160 } 7161 } 7162 } 7163 7164 /** 7165 * Dispatch a hint about whether this view is displayed. For instance, when 7166 * a View moves out of the screen, it might receives a display hint indicating 7167 * the view is not displayed. Applications should not <em>rely</em> on this hint 7168 * as there is no guarantee that they will receive one. 7169 * 7170 * @param hint A hint about whether or not this view is displayed: 7171 * {@link #VISIBLE} or {@link #INVISIBLE}. 7172 */ 7173 public void dispatchDisplayHint(int hint) { 7174 onDisplayHint(hint); 7175 } 7176 7177 /** 7178 * Gives this view a hint about whether is displayed or not. For instance, when 7179 * a View moves out of the screen, it might receives a display hint indicating 7180 * the view is not displayed. Applications should not <em>rely</em> on this hint 7181 * as there is no guarantee that they will receive one. 7182 * 7183 * @param hint A hint about whether or not this view is displayed: 7184 * {@link #VISIBLE} or {@link #INVISIBLE}. 7185 */ 7186 protected void onDisplayHint(int hint) { 7187 } 7188 7189 /** 7190 * Dispatch a window visibility change down the view hierarchy. 7191 * ViewGroups should override to route to their children. 7192 * 7193 * @param visibility The new visibility of the window. 7194 * 7195 * @see #onWindowVisibilityChanged(int) 7196 */ 7197 public void dispatchWindowVisibilityChanged(int visibility) { 7198 onWindowVisibilityChanged(visibility); 7199 } 7200 7201 /** 7202 * Called when the window containing has change its visibility 7203 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7204 * that this tells you whether or not your window is being made visible 7205 * to the window manager; this does <em>not</em> tell you whether or not 7206 * your window is obscured by other windows on the screen, even if it 7207 * is itself visible. 7208 * 7209 * @param visibility The new visibility of the window. 7210 */ 7211 protected void onWindowVisibilityChanged(int visibility) { 7212 if (visibility == VISIBLE) { 7213 initialAwakenScrollBars(); 7214 } 7215 } 7216 7217 /** 7218 * Returns the current visibility of the window this view is attached to 7219 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7220 * 7221 * @return Returns the current visibility of the view's window. 7222 */ 7223 public int getWindowVisibility() { 7224 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7225 } 7226 7227 /** 7228 * Retrieve the overall visible display size in which the window this view is 7229 * attached to has been positioned in. This takes into account screen 7230 * decorations above the window, for both cases where the window itself 7231 * is being position inside of them or the window is being placed under 7232 * then and covered insets are used for the window to position its content 7233 * inside. In effect, this tells you the available area where content can 7234 * be placed and remain visible to users. 7235 * 7236 * <p>This function requires an IPC back to the window manager to retrieve 7237 * the requested information, so should not be used in performance critical 7238 * code like drawing. 7239 * 7240 * @param outRect Filled in with the visible display frame. If the view 7241 * is not attached to a window, this is simply the raw display size. 7242 */ 7243 public void getWindowVisibleDisplayFrame(Rect outRect) { 7244 if (mAttachInfo != null) { 7245 try { 7246 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7247 } catch (RemoteException e) { 7248 return; 7249 } 7250 // XXX This is really broken, and probably all needs to be done 7251 // in the window manager, and we need to know more about whether 7252 // we want the area behind or in front of the IME. 7253 final Rect insets = mAttachInfo.mVisibleInsets; 7254 outRect.left += insets.left; 7255 outRect.top += insets.top; 7256 outRect.right -= insets.right; 7257 outRect.bottom -= insets.bottom; 7258 return; 7259 } 7260 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7261 d.getRectSize(outRect); 7262 } 7263 7264 /** 7265 * Dispatch a notification about a resource configuration change down 7266 * the view hierarchy. 7267 * ViewGroups should override to route to their children. 7268 * 7269 * @param newConfig The new resource configuration. 7270 * 7271 * @see #onConfigurationChanged(android.content.res.Configuration) 7272 */ 7273 public void dispatchConfigurationChanged(Configuration newConfig) { 7274 onConfigurationChanged(newConfig); 7275 } 7276 7277 /** 7278 * Called when the current configuration of the resources being used 7279 * by the application have changed. You can use this to decide when 7280 * to reload resources that can changed based on orientation and other 7281 * configuration characterstics. You only need to use this if you are 7282 * not relying on the normal {@link android.app.Activity} mechanism of 7283 * recreating the activity instance upon a configuration change. 7284 * 7285 * @param newConfig The new resource configuration. 7286 */ 7287 protected void onConfigurationChanged(Configuration newConfig) { 7288 } 7289 7290 /** 7291 * Private function to aggregate all per-view attributes in to the view 7292 * root. 7293 */ 7294 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7295 performCollectViewAttributes(attachInfo, visibility); 7296 } 7297 7298 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7299 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7300 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7301 attachInfo.mKeepScreenOn = true; 7302 } 7303 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7304 ListenerInfo li = mListenerInfo; 7305 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7306 attachInfo.mHasSystemUiListeners = true; 7307 } 7308 } 7309 } 7310 7311 void needGlobalAttributesUpdate(boolean force) { 7312 final AttachInfo ai = mAttachInfo; 7313 if (ai != null) { 7314 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7315 || ai.mHasSystemUiListeners) { 7316 ai.mRecomputeGlobalAttributes = true; 7317 } 7318 } 7319 } 7320 7321 /** 7322 * Returns whether the device is currently in touch mode. Touch mode is entered 7323 * once the user begins interacting with the device by touch, and affects various 7324 * things like whether focus is always visible to the user. 7325 * 7326 * @return Whether the device is in touch mode. 7327 */ 7328 @ViewDebug.ExportedProperty 7329 public boolean isInTouchMode() { 7330 if (mAttachInfo != null) { 7331 return mAttachInfo.mInTouchMode; 7332 } else { 7333 return ViewRootImpl.isInTouchMode(); 7334 } 7335 } 7336 7337 /** 7338 * Returns the context the view is running in, through which it can 7339 * access the current theme, resources, etc. 7340 * 7341 * @return The view's Context. 7342 */ 7343 @ViewDebug.CapturedViewProperty 7344 public final Context getContext() { 7345 return mContext; 7346 } 7347 7348 /** 7349 * Handle a key event before it is processed by any input method 7350 * associated with the view hierarchy. This can be used to intercept 7351 * key events in special situations before the IME consumes them; a 7352 * typical example would be handling the BACK key to update the application's 7353 * UI instead of allowing the IME to see it and close itself. 7354 * 7355 * @param keyCode The value in event.getKeyCode(). 7356 * @param event Description of the key event. 7357 * @return If you handled the event, return true. If you want to allow the 7358 * event to be handled by the next receiver, return false. 7359 */ 7360 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7361 return false; 7362 } 7363 7364 /** 7365 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7366 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7367 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7368 * is released, if the view is enabled and clickable. 7369 * 7370 * @param keyCode A key code that represents the button pressed, from 7371 * {@link android.view.KeyEvent}. 7372 * @param event The KeyEvent object that defines the button action. 7373 */ 7374 public boolean onKeyDown(int keyCode, KeyEvent event) { 7375 boolean result = false; 7376 7377 switch (keyCode) { 7378 case KeyEvent.KEYCODE_DPAD_CENTER: 7379 case KeyEvent.KEYCODE_ENTER: { 7380 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7381 return true; 7382 } 7383 // Long clickable items don't necessarily have to be clickable 7384 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7385 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7386 (event.getRepeatCount() == 0)) { 7387 setPressed(true); 7388 checkForLongClick(0); 7389 return true; 7390 } 7391 break; 7392 } 7393 } 7394 return result; 7395 } 7396 7397 /** 7398 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7399 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7400 * the event). 7401 */ 7402 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7403 return false; 7404 } 7405 7406 /** 7407 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7408 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7409 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7410 * {@link KeyEvent#KEYCODE_ENTER} is released. 7411 * 7412 * @param keyCode A key code that represents the button pressed, from 7413 * {@link android.view.KeyEvent}. 7414 * @param event The KeyEvent object that defines the button action. 7415 */ 7416 public boolean onKeyUp(int keyCode, KeyEvent event) { 7417 boolean result = false; 7418 7419 switch (keyCode) { 7420 case KeyEvent.KEYCODE_DPAD_CENTER: 7421 case KeyEvent.KEYCODE_ENTER: { 7422 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7423 return true; 7424 } 7425 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7426 setPressed(false); 7427 7428 if (!mHasPerformedLongPress) { 7429 // This is a tap, so remove the longpress check 7430 removeLongPressCallback(); 7431 7432 result = performClick(); 7433 } 7434 } 7435 break; 7436 } 7437 } 7438 return result; 7439 } 7440 7441 /** 7442 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7443 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7444 * the event). 7445 * 7446 * @param keyCode A key code that represents the button pressed, from 7447 * {@link android.view.KeyEvent}. 7448 * @param repeatCount The number of times the action was made. 7449 * @param event The KeyEvent object that defines the button action. 7450 */ 7451 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7452 return false; 7453 } 7454 7455 /** 7456 * Called on the focused view when a key shortcut event is not handled. 7457 * Override this method to implement local key shortcuts for the View. 7458 * Key shortcuts can also be implemented by setting the 7459 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7460 * 7461 * @param keyCode The value in event.getKeyCode(). 7462 * @param event Description of the key event. 7463 * @return If you handled the event, return true. If you want to allow the 7464 * event to be handled by the next receiver, return false. 7465 */ 7466 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7467 return false; 7468 } 7469 7470 /** 7471 * Check whether the called view is a text editor, in which case it 7472 * would make sense to automatically display a soft input window for 7473 * it. Subclasses should override this if they implement 7474 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7475 * a call on that method would return a non-null InputConnection, and 7476 * they are really a first-class editor that the user would normally 7477 * start typing on when the go into a window containing your view. 7478 * 7479 * <p>The default implementation always returns false. This does 7480 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7481 * will not be called or the user can not otherwise perform edits on your 7482 * view; it is just a hint to the system that this is not the primary 7483 * purpose of this view. 7484 * 7485 * @return Returns true if this view is a text editor, else false. 7486 */ 7487 public boolean onCheckIsTextEditor() { 7488 return false; 7489 } 7490 7491 /** 7492 * Create a new InputConnection for an InputMethod to interact 7493 * with the view. The default implementation returns null, since it doesn't 7494 * support input methods. You can override this to implement such support. 7495 * This is only needed for views that take focus and text input. 7496 * 7497 * <p>When implementing this, you probably also want to implement 7498 * {@link #onCheckIsTextEditor()} to indicate you will return a 7499 * non-null InputConnection. 7500 * 7501 * @param outAttrs Fill in with attribute information about the connection. 7502 */ 7503 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7504 return null; 7505 } 7506 7507 /** 7508 * Called by the {@link android.view.inputmethod.InputMethodManager} 7509 * when a view who is not the current 7510 * input connection target is trying to make a call on the manager. The 7511 * default implementation returns false; you can override this to return 7512 * true for certain views if you are performing InputConnection proxying 7513 * to them. 7514 * @param view The View that is making the InputMethodManager call. 7515 * @return Return true to allow the call, false to reject. 7516 */ 7517 public boolean checkInputConnectionProxy(View view) { 7518 return false; 7519 } 7520 7521 /** 7522 * Show the context menu for this view. It is not safe to hold on to the 7523 * menu after returning from this method. 7524 * 7525 * You should normally not overload this method. Overload 7526 * {@link #onCreateContextMenu(ContextMenu)} or define an 7527 * {@link OnCreateContextMenuListener} to add items to the context menu. 7528 * 7529 * @param menu The context menu to populate 7530 */ 7531 public void createContextMenu(ContextMenu menu) { 7532 ContextMenuInfo menuInfo = getContextMenuInfo(); 7533 7534 // Sets the current menu info so all items added to menu will have 7535 // my extra info set. 7536 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7537 7538 onCreateContextMenu(menu); 7539 ListenerInfo li = mListenerInfo; 7540 if (li != null && li.mOnCreateContextMenuListener != null) { 7541 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7542 } 7543 7544 // Clear the extra information so subsequent items that aren't mine don't 7545 // have my extra info. 7546 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7547 7548 if (mParent != null) { 7549 mParent.createContextMenu(menu); 7550 } 7551 } 7552 7553 /** 7554 * Views should implement this if they have extra information to associate 7555 * with the context menu. The return result is supplied as a parameter to 7556 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7557 * callback. 7558 * 7559 * @return Extra information about the item for which the context menu 7560 * should be shown. This information will vary across different 7561 * subclasses of View. 7562 */ 7563 protected ContextMenuInfo getContextMenuInfo() { 7564 return null; 7565 } 7566 7567 /** 7568 * Views should implement this if the view itself is going to add items to 7569 * the context menu. 7570 * 7571 * @param menu the context menu to populate 7572 */ 7573 protected void onCreateContextMenu(ContextMenu menu) { 7574 } 7575 7576 /** 7577 * Implement this method to handle trackball motion events. The 7578 * <em>relative</em> movement of the trackball since the last event 7579 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7580 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7581 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7582 * they will often be fractional values, representing the more fine-grained 7583 * movement information available from a trackball). 7584 * 7585 * @param event The motion event. 7586 * @return True if the event was handled, false otherwise. 7587 */ 7588 public boolean onTrackballEvent(MotionEvent event) { 7589 return false; 7590 } 7591 7592 /** 7593 * Implement this method to handle generic motion events. 7594 * <p> 7595 * Generic motion events describe joystick movements, mouse hovers, track pad 7596 * touches, scroll wheel movements and other input events. The 7597 * {@link MotionEvent#getSource() source} of the motion event specifies 7598 * the class of input that was received. Implementations of this method 7599 * must examine the bits in the source before processing the event. 7600 * The following code example shows how this is done. 7601 * </p><p> 7602 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7603 * are delivered to the view under the pointer. All other generic motion events are 7604 * delivered to the focused view. 7605 * </p> 7606 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7607 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7608 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7609 * // process the joystick movement... 7610 * return true; 7611 * } 7612 * } 7613 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7614 * switch (event.getAction()) { 7615 * case MotionEvent.ACTION_HOVER_MOVE: 7616 * // process the mouse hover movement... 7617 * return true; 7618 * case MotionEvent.ACTION_SCROLL: 7619 * // process the scroll wheel movement... 7620 * return true; 7621 * } 7622 * } 7623 * return super.onGenericMotionEvent(event); 7624 * }</pre> 7625 * 7626 * @param event The generic motion event being processed. 7627 * @return True if the event was handled, false otherwise. 7628 */ 7629 public boolean onGenericMotionEvent(MotionEvent event) { 7630 return false; 7631 } 7632 7633 /** 7634 * Implement this method to handle hover events. 7635 * <p> 7636 * This method is called whenever a pointer is hovering into, over, or out of the 7637 * bounds of a view and the view is not currently being touched. 7638 * Hover events are represented as pointer events with action 7639 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7640 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7641 * </p> 7642 * <ul> 7643 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7644 * when the pointer enters the bounds of the view.</li> 7645 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7646 * when the pointer has already entered the bounds of the view and has moved.</li> 7647 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7648 * when the pointer has exited the bounds of the view or when the pointer is 7649 * about to go down due to a button click, tap, or similar user action that 7650 * causes the view to be touched.</li> 7651 * </ul> 7652 * <p> 7653 * The view should implement this method to return true to indicate that it is 7654 * handling the hover event, such as by changing its drawable state. 7655 * </p><p> 7656 * The default implementation calls {@link #setHovered} to update the hovered state 7657 * of the view when a hover enter or hover exit event is received, if the view 7658 * is enabled and is clickable. The default implementation also sends hover 7659 * accessibility events. 7660 * </p> 7661 * 7662 * @param event The motion event that describes the hover. 7663 * @return True if the view handled the hover event. 7664 * 7665 * @see #isHovered 7666 * @see #setHovered 7667 * @see #onHoverChanged 7668 */ 7669 public boolean onHoverEvent(MotionEvent event) { 7670 // The root view may receive hover (or touch) events that are outside the bounds of 7671 // the window. This code ensures that we only send accessibility events for 7672 // hovers that are actually within the bounds of the root view. 7673 final int action = event.getActionMasked(); 7674 if (!mSendingHoverAccessibilityEvents) { 7675 if ((action == MotionEvent.ACTION_HOVER_ENTER 7676 || action == MotionEvent.ACTION_HOVER_MOVE) 7677 && !hasHoveredChild() 7678 && pointInView(event.getX(), event.getY())) { 7679 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7680 mSendingHoverAccessibilityEvents = true; 7681 requestAccessibilityFocusFromHover(); 7682 } 7683 } else { 7684 if (action == MotionEvent.ACTION_HOVER_EXIT 7685 || (action == MotionEvent.ACTION_MOVE 7686 && !pointInView(event.getX(), event.getY()))) { 7687 mSendingHoverAccessibilityEvents = false; 7688 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7689 // If the window does not have input focus we take away accessibility 7690 // focus as soon as the user stop hovering over the view. 7691 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7692 getViewRootImpl().setAccessibilityFocusedHost(null); 7693 } 7694 } 7695 } 7696 7697 if (isHoverable()) { 7698 switch (action) { 7699 case MotionEvent.ACTION_HOVER_ENTER: 7700 setHovered(true); 7701 break; 7702 case MotionEvent.ACTION_HOVER_EXIT: 7703 setHovered(false); 7704 break; 7705 } 7706 7707 // Dispatch the event to onGenericMotionEvent before returning true. 7708 // This is to provide compatibility with existing applications that 7709 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7710 // break because of the new default handling for hoverable views 7711 // in onHoverEvent. 7712 // Note that onGenericMotionEvent will be called by default when 7713 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7714 dispatchGenericMotionEventInternal(event); 7715 return true; 7716 } 7717 7718 return false; 7719 } 7720 7721 /** 7722 * Returns true if the view should handle {@link #onHoverEvent} 7723 * by calling {@link #setHovered} to change its hovered state. 7724 * 7725 * @return True if the view is hoverable. 7726 */ 7727 private boolean isHoverable() { 7728 final int viewFlags = mViewFlags; 7729 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7730 return false; 7731 } 7732 7733 return (viewFlags & CLICKABLE) == CLICKABLE 7734 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7735 } 7736 7737 /** 7738 * Returns true if the view is currently hovered. 7739 * 7740 * @return True if the view is currently hovered. 7741 * 7742 * @see #setHovered 7743 * @see #onHoverChanged 7744 */ 7745 @ViewDebug.ExportedProperty 7746 public boolean isHovered() { 7747 return (mPrivateFlags & HOVERED) != 0; 7748 } 7749 7750 /** 7751 * Sets whether the view is currently hovered. 7752 * <p> 7753 * Calling this method also changes the drawable state of the view. This 7754 * enables the view to react to hover by using different drawable resources 7755 * to change its appearance. 7756 * </p><p> 7757 * The {@link #onHoverChanged} method is called when the hovered state changes. 7758 * </p> 7759 * 7760 * @param hovered True if the view is hovered. 7761 * 7762 * @see #isHovered 7763 * @see #onHoverChanged 7764 */ 7765 public void setHovered(boolean hovered) { 7766 if (hovered) { 7767 if ((mPrivateFlags & HOVERED) == 0) { 7768 mPrivateFlags |= HOVERED; 7769 refreshDrawableState(); 7770 onHoverChanged(true); 7771 } 7772 } else { 7773 if ((mPrivateFlags & HOVERED) != 0) { 7774 mPrivateFlags &= ~HOVERED; 7775 refreshDrawableState(); 7776 onHoverChanged(false); 7777 } 7778 } 7779 } 7780 7781 /** 7782 * Implement this method to handle hover state changes. 7783 * <p> 7784 * This method is called whenever the hover state changes as a result of a 7785 * call to {@link #setHovered}. 7786 * </p> 7787 * 7788 * @param hovered The current hover state, as returned by {@link #isHovered}. 7789 * 7790 * @see #isHovered 7791 * @see #setHovered 7792 */ 7793 public void onHoverChanged(boolean hovered) { 7794 } 7795 7796 /** 7797 * Implement this method to handle touch screen motion events. 7798 * 7799 * @param event The motion event. 7800 * @return True if the event was handled, false otherwise. 7801 */ 7802 public boolean onTouchEvent(MotionEvent event) { 7803 final int viewFlags = mViewFlags; 7804 7805 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7806 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7807 setPressed(false); 7808 } 7809 // A disabled view that is clickable still consumes the touch 7810 // events, it just doesn't respond to them. 7811 return (((viewFlags & CLICKABLE) == CLICKABLE || 7812 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7813 } 7814 7815 if (mTouchDelegate != null) { 7816 if (mTouchDelegate.onTouchEvent(event)) { 7817 return true; 7818 } 7819 } 7820 7821 if (((viewFlags & CLICKABLE) == CLICKABLE || 7822 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7823 switch (event.getAction()) { 7824 case MotionEvent.ACTION_UP: 7825 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7826 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7827 // take focus if we don't have it already and we should in 7828 // touch mode. 7829 boolean focusTaken = false; 7830 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7831 focusTaken = requestFocus(); 7832 } 7833 7834 if (prepressed) { 7835 // The button is being released before we actually 7836 // showed it as pressed. Make it show the pressed 7837 // state now (before scheduling the click) to ensure 7838 // the user sees it. 7839 setPressed(true); 7840 } 7841 7842 if (!mHasPerformedLongPress) { 7843 // This is a tap, so remove the longpress check 7844 removeLongPressCallback(); 7845 7846 // Only perform take click actions if we were in the pressed state 7847 if (!focusTaken) { 7848 // Use a Runnable and post this rather than calling 7849 // performClick directly. This lets other visual state 7850 // of the view update before click actions start. 7851 if (mPerformClick == null) { 7852 mPerformClick = new PerformClick(); 7853 } 7854 if (!post(mPerformClick)) { 7855 performClick(); 7856 } 7857 } 7858 } 7859 7860 if (mUnsetPressedState == null) { 7861 mUnsetPressedState = new UnsetPressedState(); 7862 } 7863 7864 if (prepressed) { 7865 postDelayed(mUnsetPressedState, 7866 ViewConfiguration.getPressedStateDuration()); 7867 } else if (!post(mUnsetPressedState)) { 7868 // If the post failed, unpress right now 7869 mUnsetPressedState.run(); 7870 } 7871 removeTapCallback(); 7872 } 7873 break; 7874 7875 case MotionEvent.ACTION_DOWN: 7876 mHasPerformedLongPress = false; 7877 7878 if (performButtonActionOnTouchDown(event)) { 7879 break; 7880 } 7881 7882 // Walk up the hierarchy to determine if we're inside a scrolling container. 7883 boolean isInScrollingContainer = isInScrollingContainer(); 7884 7885 // For views inside a scrolling container, delay the pressed feedback for 7886 // a short period in case this is a scroll. 7887 if (isInScrollingContainer) { 7888 mPrivateFlags |= PREPRESSED; 7889 if (mPendingCheckForTap == null) { 7890 mPendingCheckForTap = new CheckForTap(); 7891 } 7892 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7893 } else { 7894 // Not inside a scrolling container, so show the feedback right away 7895 setPressed(true); 7896 checkForLongClick(0); 7897 } 7898 break; 7899 7900 case MotionEvent.ACTION_CANCEL: 7901 setPressed(false); 7902 removeTapCallback(); 7903 break; 7904 7905 case MotionEvent.ACTION_MOVE: 7906 final int x = (int) event.getX(); 7907 final int y = (int) event.getY(); 7908 7909 // Be lenient about moving outside of buttons 7910 if (!pointInView(x, y, mTouchSlop)) { 7911 // Outside button 7912 removeTapCallback(); 7913 if ((mPrivateFlags & PRESSED) != 0) { 7914 // Remove any future long press/tap checks 7915 removeLongPressCallback(); 7916 7917 setPressed(false); 7918 } 7919 } 7920 break; 7921 } 7922 return true; 7923 } 7924 7925 return false; 7926 } 7927 7928 /** 7929 * @hide 7930 */ 7931 public boolean isInScrollingContainer() { 7932 ViewParent p = getParent(); 7933 while (p != null && p instanceof ViewGroup) { 7934 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7935 return true; 7936 } 7937 p = p.getParent(); 7938 } 7939 return false; 7940 } 7941 7942 /** 7943 * Remove the longpress detection timer. 7944 */ 7945 private void removeLongPressCallback() { 7946 if (mPendingCheckForLongPress != null) { 7947 removeCallbacks(mPendingCheckForLongPress); 7948 } 7949 } 7950 7951 /** 7952 * Remove the pending click action 7953 */ 7954 private void removePerformClickCallback() { 7955 if (mPerformClick != null) { 7956 removeCallbacks(mPerformClick); 7957 } 7958 } 7959 7960 /** 7961 * Remove the prepress detection timer. 7962 */ 7963 private void removeUnsetPressCallback() { 7964 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7965 setPressed(false); 7966 removeCallbacks(mUnsetPressedState); 7967 } 7968 } 7969 7970 /** 7971 * Remove the tap detection timer. 7972 */ 7973 private void removeTapCallback() { 7974 if (mPendingCheckForTap != null) { 7975 mPrivateFlags &= ~PREPRESSED; 7976 removeCallbacks(mPendingCheckForTap); 7977 } 7978 } 7979 7980 /** 7981 * Cancels a pending long press. Your subclass can use this if you 7982 * want the context menu to come up if the user presses and holds 7983 * at the same place, but you don't want it to come up if they press 7984 * and then move around enough to cause scrolling. 7985 */ 7986 public void cancelLongPress() { 7987 removeLongPressCallback(); 7988 7989 /* 7990 * The prepressed state handled by the tap callback is a display 7991 * construct, but the tap callback will post a long press callback 7992 * less its own timeout. Remove it here. 7993 */ 7994 removeTapCallback(); 7995 } 7996 7997 /** 7998 * Remove the pending callback for sending a 7999 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8000 */ 8001 private void removeSendViewScrolledAccessibilityEventCallback() { 8002 if (mSendViewScrolledAccessibilityEvent != null) { 8003 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8004 } 8005 } 8006 8007 /** 8008 * Sets the TouchDelegate for this View. 8009 */ 8010 public void setTouchDelegate(TouchDelegate delegate) { 8011 mTouchDelegate = delegate; 8012 } 8013 8014 /** 8015 * Gets the TouchDelegate for this View. 8016 */ 8017 public TouchDelegate getTouchDelegate() { 8018 return mTouchDelegate; 8019 } 8020 8021 /** 8022 * Set flags controlling behavior of this view. 8023 * 8024 * @param flags Constant indicating the value which should be set 8025 * @param mask Constant indicating the bit range that should be changed 8026 */ 8027 void setFlags(int flags, int mask) { 8028 int old = mViewFlags; 8029 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8030 8031 int changed = mViewFlags ^ old; 8032 if (changed == 0) { 8033 return; 8034 } 8035 int privateFlags = mPrivateFlags; 8036 8037 /* Check if the FOCUSABLE bit has changed */ 8038 if (((changed & FOCUSABLE_MASK) != 0) && 8039 ((privateFlags & HAS_BOUNDS) !=0)) { 8040 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8041 && ((privateFlags & FOCUSED) != 0)) { 8042 /* Give up focus if we are no longer focusable */ 8043 clearFocus(); 8044 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8045 && ((privateFlags & FOCUSED) == 0)) { 8046 /* 8047 * Tell the view system that we are now available to take focus 8048 * if no one else already has it. 8049 */ 8050 if (mParent != null) mParent.focusableViewAvailable(this); 8051 } 8052 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8053 notifyAccessibilityStateChanged(); 8054 } 8055 } 8056 8057 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8058 if ((changed & VISIBILITY_MASK) != 0) { 8059 /* 8060 * If this view is becoming visible, invalidate it in case it changed while 8061 * it was not visible. Marking it drawn ensures that the invalidation will 8062 * go through. 8063 */ 8064 mPrivateFlags |= DRAWN; 8065 invalidate(true); 8066 8067 needGlobalAttributesUpdate(true); 8068 8069 // a view becoming visible is worth notifying the parent 8070 // about in case nothing has focus. even if this specific view 8071 // isn't focusable, it may contain something that is, so let 8072 // the root view try to give this focus if nothing else does. 8073 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8074 mParent.focusableViewAvailable(this); 8075 } 8076 } 8077 } 8078 8079 /* Check if the GONE bit has changed */ 8080 if ((changed & GONE) != 0) { 8081 needGlobalAttributesUpdate(false); 8082 requestLayout(); 8083 8084 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8085 if (hasFocus()) clearFocus(); 8086 clearAccessibilityFocus(); 8087 destroyDrawingCache(); 8088 if (mParent instanceof View) { 8089 // GONE views noop invalidation, so invalidate the parent 8090 ((View) mParent).invalidate(true); 8091 } 8092 // Mark the view drawn to ensure that it gets invalidated properly the next 8093 // time it is visible and gets invalidated 8094 mPrivateFlags |= DRAWN; 8095 } 8096 if (mAttachInfo != null) { 8097 mAttachInfo.mViewVisibilityChanged = true; 8098 } 8099 } 8100 8101 /* Check if the VISIBLE bit has changed */ 8102 if ((changed & INVISIBLE) != 0) { 8103 needGlobalAttributesUpdate(false); 8104 /* 8105 * If this view is becoming invisible, set the DRAWN flag so that 8106 * the next invalidate() will not be skipped. 8107 */ 8108 mPrivateFlags |= DRAWN; 8109 8110 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8111 // root view becoming invisible shouldn't clear focus and accessibility focus 8112 if (getRootView() != this) { 8113 clearFocus(); 8114 clearAccessibilityFocus(); 8115 } 8116 } 8117 if (mAttachInfo != null) { 8118 mAttachInfo.mViewVisibilityChanged = true; 8119 } 8120 } 8121 8122 if ((changed & VISIBILITY_MASK) != 0) { 8123 if (mParent instanceof ViewGroup) { 8124 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8125 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8126 ((View) mParent).invalidate(true); 8127 } else if (mParent != null) { 8128 mParent.invalidateChild(this, null); 8129 } 8130 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8131 } 8132 8133 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8134 destroyDrawingCache(); 8135 } 8136 8137 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8138 destroyDrawingCache(); 8139 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8140 invalidateParentCaches(); 8141 } 8142 8143 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8144 destroyDrawingCache(); 8145 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8146 } 8147 8148 if ((changed & DRAW_MASK) != 0) { 8149 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8150 if (mBackground != null) { 8151 mPrivateFlags &= ~SKIP_DRAW; 8152 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8153 } else { 8154 mPrivateFlags |= SKIP_DRAW; 8155 } 8156 } else { 8157 mPrivateFlags &= ~SKIP_DRAW; 8158 } 8159 requestLayout(); 8160 invalidate(true); 8161 } 8162 8163 if ((changed & KEEP_SCREEN_ON) != 0) { 8164 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8165 mParent.recomputeViewAttributes(this); 8166 } 8167 } 8168 8169 if (AccessibilityManager.getInstance(mContext).isEnabled() 8170 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8171 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8172 notifyAccessibilityStateChanged(); 8173 } 8174 } 8175 8176 /** 8177 * Change the view's z order in the tree, so it's on top of other sibling 8178 * views 8179 */ 8180 public void bringToFront() { 8181 if (mParent != null) { 8182 mParent.bringChildToFront(this); 8183 } 8184 } 8185 8186 /** 8187 * This is called in response to an internal scroll in this view (i.e., the 8188 * view scrolled its own contents). This is typically as a result of 8189 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8190 * called. 8191 * 8192 * @param l Current horizontal scroll origin. 8193 * @param t Current vertical scroll origin. 8194 * @param oldl Previous horizontal scroll origin. 8195 * @param oldt Previous vertical scroll origin. 8196 */ 8197 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8198 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8199 postSendViewScrolledAccessibilityEventCallback(); 8200 } 8201 8202 mBackgroundSizeChanged = true; 8203 8204 final AttachInfo ai = mAttachInfo; 8205 if (ai != null) { 8206 ai.mViewScrollChanged = true; 8207 } 8208 } 8209 8210 /** 8211 * Interface definition for a callback to be invoked when the layout bounds of a view 8212 * changes due to layout processing. 8213 */ 8214 public interface OnLayoutChangeListener { 8215 /** 8216 * Called when the focus state of a view has changed. 8217 * 8218 * @param v The view whose state has changed. 8219 * @param left The new value of the view's left property. 8220 * @param top The new value of the view's top property. 8221 * @param right The new value of the view's right property. 8222 * @param bottom The new value of the view's bottom property. 8223 * @param oldLeft The previous value of the view's left property. 8224 * @param oldTop The previous value of the view's top property. 8225 * @param oldRight The previous value of the view's right property. 8226 * @param oldBottom The previous value of the view's bottom property. 8227 */ 8228 void onLayoutChange(View v, int left, int top, int right, int bottom, 8229 int oldLeft, int oldTop, int oldRight, int oldBottom); 8230 } 8231 8232 /** 8233 * This is called during layout when the size of this view has changed. If 8234 * you were just added to the view hierarchy, you're called with the old 8235 * values of 0. 8236 * 8237 * @param w Current width of this view. 8238 * @param h Current height of this view. 8239 * @param oldw Old width of this view. 8240 * @param oldh Old height of this view. 8241 */ 8242 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8243 } 8244 8245 /** 8246 * Called by draw to draw the child views. This may be overridden 8247 * by derived classes to gain control just before its children are drawn 8248 * (but after its own view has been drawn). 8249 * @param canvas the canvas on which to draw the view 8250 */ 8251 protected void dispatchDraw(Canvas canvas) { 8252 8253 } 8254 8255 /** 8256 * Gets the parent of this view. Note that the parent is a 8257 * ViewParent and not necessarily a View. 8258 * 8259 * @return Parent of this view. 8260 */ 8261 public final ViewParent getParent() { 8262 return mParent; 8263 } 8264 8265 /** 8266 * Set the horizontal scrolled position of your view. This will cause a call to 8267 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8268 * invalidated. 8269 * @param value the x position to scroll to 8270 */ 8271 public void setScrollX(int value) { 8272 scrollTo(value, mScrollY); 8273 } 8274 8275 /** 8276 * Set the vertical scrolled position of your view. This will cause a call to 8277 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8278 * invalidated. 8279 * @param value the y position to scroll to 8280 */ 8281 public void setScrollY(int value) { 8282 scrollTo(mScrollX, value); 8283 } 8284 8285 /** 8286 * Return the scrolled left position of this view. This is the left edge of 8287 * the displayed part of your view. You do not need to draw any pixels 8288 * farther left, since those are outside of the frame of your view on 8289 * screen. 8290 * 8291 * @return The left edge of the displayed part of your view, in pixels. 8292 */ 8293 public final int getScrollX() { 8294 return mScrollX; 8295 } 8296 8297 /** 8298 * Return the scrolled top position of this view. This is the top edge of 8299 * the displayed part of your view. You do not need to draw any pixels above 8300 * it, since those are outside of the frame of your view on screen. 8301 * 8302 * @return The top edge of the displayed part of your view, in pixels. 8303 */ 8304 public final int getScrollY() { 8305 return mScrollY; 8306 } 8307 8308 /** 8309 * Return the width of the your view. 8310 * 8311 * @return The width of your view, in pixels. 8312 */ 8313 @ViewDebug.ExportedProperty(category = "layout") 8314 public final int getWidth() { 8315 return mRight - mLeft; 8316 } 8317 8318 /** 8319 * Return the height of your view. 8320 * 8321 * @return The height of your view, in pixels. 8322 */ 8323 @ViewDebug.ExportedProperty(category = "layout") 8324 public final int getHeight() { 8325 return mBottom - mTop; 8326 } 8327 8328 /** 8329 * Return the visible drawing bounds of your view. Fills in the output 8330 * rectangle with the values from getScrollX(), getScrollY(), 8331 * getWidth(), and getHeight(). 8332 * 8333 * @param outRect The (scrolled) drawing bounds of the view. 8334 */ 8335 public void getDrawingRect(Rect outRect) { 8336 outRect.left = mScrollX; 8337 outRect.top = mScrollY; 8338 outRect.right = mScrollX + (mRight - mLeft); 8339 outRect.bottom = mScrollY + (mBottom - mTop); 8340 } 8341 8342 /** 8343 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8344 * raw width component (that is the result is masked by 8345 * {@link #MEASURED_SIZE_MASK}). 8346 * 8347 * @return The raw measured width of this view. 8348 */ 8349 public final int getMeasuredWidth() { 8350 return mMeasuredWidth & MEASURED_SIZE_MASK; 8351 } 8352 8353 /** 8354 * Return the full width measurement information for this view as computed 8355 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8356 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8357 * This should be used during measurement and layout calculations only. Use 8358 * {@link #getWidth()} to see how wide a view is after layout. 8359 * 8360 * @return The measured width of this view as a bit mask. 8361 */ 8362 public final int getMeasuredWidthAndState() { 8363 return mMeasuredWidth; 8364 } 8365 8366 /** 8367 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8368 * raw width component (that is the result is masked by 8369 * {@link #MEASURED_SIZE_MASK}). 8370 * 8371 * @return The raw measured height of this view. 8372 */ 8373 public final int getMeasuredHeight() { 8374 return mMeasuredHeight & MEASURED_SIZE_MASK; 8375 } 8376 8377 /** 8378 * Return the full height measurement information for this view as computed 8379 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8380 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8381 * This should be used during measurement and layout calculations only. Use 8382 * {@link #getHeight()} to see how wide a view is after layout. 8383 * 8384 * @return The measured width of this view as a bit mask. 8385 */ 8386 public final int getMeasuredHeightAndState() { 8387 return mMeasuredHeight; 8388 } 8389 8390 /** 8391 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8392 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8393 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8394 * and the height component is at the shifted bits 8395 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8396 */ 8397 public final int getMeasuredState() { 8398 return (mMeasuredWidth&MEASURED_STATE_MASK) 8399 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8400 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8401 } 8402 8403 /** 8404 * The transform matrix of this view, which is calculated based on the current 8405 * roation, scale, and pivot properties. 8406 * 8407 * @see #getRotation() 8408 * @see #getScaleX() 8409 * @see #getScaleY() 8410 * @see #getPivotX() 8411 * @see #getPivotY() 8412 * @return The current transform matrix for the view 8413 */ 8414 public Matrix getMatrix() { 8415 if (mTransformationInfo != null) { 8416 updateMatrix(); 8417 return mTransformationInfo.mMatrix; 8418 } 8419 return Matrix.IDENTITY_MATRIX; 8420 } 8421 8422 /** 8423 * Utility function to determine if the value is far enough away from zero to be 8424 * considered non-zero. 8425 * @param value A floating point value to check for zero-ness 8426 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8427 */ 8428 private static boolean nonzero(float value) { 8429 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8430 } 8431 8432 /** 8433 * Returns true if the transform matrix is the identity matrix. 8434 * Recomputes the matrix if necessary. 8435 * 8436 * @return True if the transform matrix is the identity matrix, false otherwise. 8437 */ 8438 final boolean hasIdentityMatrix() { 8439 if (mTransformationInfo != null) { 8440 updateMatrix(); 8441 return mTransformationInfo.mMatrixIsIdentity; 8442 } 8443 return true; 8444 } 8445 8446 void ensureTransformationInfo() { 8447 if (mTransformationInfo == null) { 8448 mTransformationInfo = new TransformationInfo(); 8449 } 8450 } 8451 8452 /** 8453 * Recomputes the transform matrix if necessary. 8454 */ 8455 private void updateMatrix() { 8456 final TransformationInfo info = mTransformationInfo; 8457 if (info == null) { 8458 return; 8459 } 8460 if (info.mMatrixDirty) { 8461 // transform-related properties have changed since the last time someone 8462 // asked for the matrix; recalculate it with the current values 8463 8464 // Figure out if we need to update the pivot point 8465 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8466 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8467 info.mPrevWidth = mRight - mLeft; 8468 info.mPrevHeight = mBottom - mTop; 8469 info.mPivotX = info.mPrevWidth / 2f; 8470 info.mPivotY = info.mPrevHeight / 2f; 8471 } 8472 } 8473 info.mMatrix.reset(); 8474 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8475 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8476 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8477 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8478 } else { 8479 if (info.mCamera == null) { 8480 info.mCamera = new Camera(); 8481 info.matrix3D = new Matrix(); 8482 } 8483 info.mCamera.save(); 8484 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8485 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8486 info.mCamera.getMatrix(info.matrix3D); 8487 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8488 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8489 info.mPivotY + info.mTranslationY); 8490 info.mMatrix.postConcat(info.matrix3D); 8491 info.mCamera.restore(); 8492 } 8493 info.mMatrixDirty = false; 8494 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8495 info.mInverseMatrixDirty = true; 8496 } 8497 } 8498 8499 /** 8500 * Utility method to retrieve the inverse of the current mMatrix property. 8501 * We cache the matrix to avoid recalculating it when transform properties 8502 * have not changed. 8503 * 8504 * @return The inverse of the current matrix of this view. 8505 */ 8506 final Matrix getInverseMatrix() { 8507 final TransformationInfo info = mTransformationInfo; 8508 if (info != null) { 8509 updateMatrix(); 8510 if (info.mInverseMatrixDirty) { 8511 if (info.mInverseMatrix == null) { 8512 info.mInverseMatrix = new Matrix(); 8513 } 8514 info.mMatrix.invert(info.mInverseMatrix); 8515 info.mInverseMatrixDirty = false; 8516 } 8517 return info.mInverseMatrix; 8518 } 8519 return Matrix.IDENTITY_MATRIX; 8520 } 8521 8522 /** 8523 * Gets the distance along the Z axis from the camera to this view. 8524 * 8525 * @see #setCameraDistance(float) 8526 * 8527 * @return The distance along the Z axis. 8528 */ 8529 public float getCameraDistance() { 8530 ensureTransformationInfo(); 8531 final float dpi = mResources.getDisplayMetrics().densityDpi; 8532 final TransformationInfo info = mTransformationInfo; 8533 if (info.mCamera == null) { 8534 info.mCamera = new Camera(); 8535 info.matrix3D = new Matrix(); 8536 } 8537 return -(info.mCamera.getLocationZ() * dpi); 8538 } 8539 8540 /** 8541 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8542 * views are drawn) from the camera to this view. The camera's distance 8543 * affects 3D transformations, for instance rotations around the X and Y 8544 * axis. If the rotationX or rotationY properties are changed and this view is 8545 * large (more than half the size of the screen), it is recommended to always 8546 * use a camera distance that's greater than the height (X axis rotation) or 8547 * the width (Y axis rotation) of this view.</p> 8548 * 8549 * <p>The distance of the camera from the view plane can have an affect on the 8550 * perspective distortion of the view when it is rotated around the x or y axis. 8551 * For example, a large distance will result in a large viewing angle, and there 8552 * will not be much perspective distortion of the view as it rotates. A short 8553 * distance may cause much more perspective distortion upon rotation, and can 8554 * also result in some drawing artifacts if the rotated view ends up partially 8555 * behind the camera (which is why the recommendation is to use a distance at 8556 * least as far as the size of the view, if the view is to be rotated.)</p> 8557 * 8558 * <p>The distance is expressed in "depth pixels." The default distance depends 8559 * on the screen density. For instance, on a medium density display, the 8560 * default distance is 1280. On a high density display, the default distance 8561 * is 1920.</p> 8562 * 8563 * <p>If you want to specify a distance that leads to visually consistent 8564 * results across various densities, use the following formula:</p> 8565 * <pre> 8566 * float scale = context.getResources().getDisplayMetrics().density; 8567 * view.setCameraDistance(distance * scale); 8568 * </pre> 8569 * 8570 * <p>The density scale factor of a high density display is 1.5, 8571 * and 1920 = 1280 * 1.5.</p> 8572 * 8573 * @param distance The distance in "depth pixels", if negative the opposite 8574 * value is used 8575 * 8576 * @see #setRotationX(float) 8577 * @see #setRotationY(float) 8578 */ 8579 public void setCameraDistance(float distance) { 8580 invalidateViewProperty(true, false); 8581 8582 ensureTransformationInfo(); 8583 final float dpi = mResources.getDisplayMetrics().densityDpi; 8584 final TransformationInfo info = mTransformationInfo; 8585 if (info.mCamera == null) { 8586 info.mCamera = new Camera(); 8587 info.matrix3D = new Matrix(); 8588 } 8589 8590 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8591 info.mMatrixDirty = true; 8592 8593 invalidateViewProperty(false, false); 8594 if (mDisplayList != null) { 8595 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8596 } 8597 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8598 // View was rejected last time it was drawn by its parent; this may have changed 8599 invalidateParentIfNeeded(); 8600 } 8601 } 8602 8603 /** 8604 * The degrees that the view is rotated around the pivot point. 8605 * 8606 * @see #setRotation(float) 8607 * @see #getPivotX() 8608 * @see #getPivotY() 8609 * 8610 * @return The degrees of rotation. 8611 */ 8612 @ViewDebug.ExportedProperty(category = "drawing") 8613 public float getRotation() { 8614 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8615 } 8616 8617 /** 8618 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8619 * result in clockwise rotation. 8620 * 8621 * @param rotation The degrees of rotation. 8622 * 8623 * @see #getRotation() 8624 * @see #getPivotX() 8625 * @see #getPivotY() 8626 * @see #setRotationX(float) 8627 * @see #setRotationY(float) 8628 * 8629 * @attr ref android.R.styleable#View_rotation 8630 */ 8631 public void setRotation(float rotation) { 8632 ensureTransformationInfo(); 8633 final TransformationInfo info = mTransformationInfo; 8634 if (info.mRotation != rotation) { 8635 // Double-invalidation is necessary to capture view's old and new areas 8636 invalidateViewProperty(true, false); 8637 info.mRotation = rotation; 8638 info.mMatrixDirty = true; 8639 invalidateViewProperty(false, true); 8640 if (mDisplayList != null) { 8641 mDisplayList.setRotation(rotation); 8642 } 8643 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8644 // View was rejected last time it was drawn by its parent; this may have changed 8645 invalidateParentIfNeeded(); 8646 } 8647 } 8648 } 8649 8650 /** 8651 * The degrees that the view is rotated around the vertical axis through the pivot point. 8652 * 8653 * @see #getPivotX() 8654 * @see #getPivotY() 8655 * @see #setRotationY(float) 8656 * 8657 * @return The degrees of Y rotation. 8658 */ 8659 @ViewDebug.ExportedProperty(category = "drawing") 8660 public float getRotationY() { 8661 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8662 } 8663 8664 /** 8665 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8666 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8667 * down the y axis. 8668 * 8669 * When rotating large views, it is recommended to adjust the camera distance 8670 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8671 * 8672 * @param rotationY The degrees of Y rotation. 8673 * 8674 * @see #getRotationY() 8675 * @see #getPivotX() 8676 * @see #getPivotY() 8677 * @see #setRotation(float) 8678 * @see #setRotationX(float) 8679 * @see #setCameraDistance(float) 8680 * 8681 * @attr ref android.R.styleable#View_rotationY 8682 */ 8683 public void setRotationY(float rotationY) { 8684 ensureTransformationInfo(); 8685 final TransformationInfo info = mTransformationInfo; 8686 if (info.mRotationY != rotationY) { 8687 invalidateViewProperty(true, false); 8688 info.mRotationY = rotationY; 8689 info.mMatrixDirty = true; 8690 invalidateViewProperty(false, true); 8691 if (mDisplayList != null) { 8692 mDisplayList.setRotationY(rotationY); 8693 } 8694 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8695 // View was rejected last time it was drawn by its parent; this may have changed 8696 invalidateParentIfNeeded(); 8697 } 8698 } 8699 } 8700 8701 /** 8702 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8703 * 8704 * @see #getPivotX() 8705 * @see #getPivotY() 8706 * @see #setRotationX(float) 8707 * 8708 * @return The degrees of X rotation. 8709 */ 8710 @ViewDebug.ExportedProperty(category = "drawing") 8711 public float getRotationX() { 8712 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8713 } 8714 8715 /** 8716 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8717 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8718 * x axis. 8719 * 8720 * When rotating large views, it is recommended to adjust the camera distance 8721 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8722 * 8723 * @param rotationX The degrees of X rotation. 8724 * 8725 * @see #getRotationX() 8726 * @see #getPivotX() 8727 * @see #getPivotY() 8728 * @see #setRotation(float) 8729 * @see #setRotationY(float) 8730 * @see #setCameraDistance(float) 8731 * 8732 * @attr ref android.R.styleable#View_rotationX 8733 */ 8734 public void setRotationX(float rotationX) { 8735 ensureTransformationInfo(); 8736 final TransformationInfo info = mTransformationInfo; 8737 if (info.mRotationX != rotationX) { 8738 invalidateViewProperty(true, false); 8739 info.mRotationX = rotationX; 8740 info.mMatrixDirty = true; 8741 invalidateViewProperty(false, true); 8742 if (mDisplayList != null) { 8743 mDisplayList.setRotationX(rotationX); 8744 } 8745 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8746 // View was rejected last time it was drawn by its parent; this may have changed 8747 invalidateParentIfNeeded(); 8748 } 8749 } 8750 } 8751 8752 /** 8753 * The amount that the view is scaled in x around the pivot point, as a proportion of 8754 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8755 * 8756 * <p>By default, this is 1.0f. 8757 * 8758 * @see #getPivotX() 8759 * @see #getPivotY() 8760 * @return The scaling factor. 8761 */ 8762 @ViewDebug.ExportedProperty(category = "drawing") 8763 public float getScaleX() { 8764 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8765 } 8766 8767 /** 8768 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8769 * the view's unscaled width. A value of 1 means that no scaling is applied. 8770 * 8771 * @param scaleX The scaling factor. 8772 * @see #getPivotX() 8773 * @see #getPivotY() 8774 * 8775 * @attr ref android.R.styleable#View_scaleX 8776 */ 8777 public void setScaleX(float scaleX) { 8778 ensureTransformationInfo(); 8779 final TransformationInfo info = mTransformationInfo; 8780 if (info.mScaleX != scaleX) { 8781 invalidateViewProperty(true, false); 8782 info.mScaleX = scaleX; 8783 info.mMatrixDirty = true; 8784 invalidateViewProperty(false, true); 8785 if (mDisplayList != null) { 8786 mDisplayList.setScaleX(scaleX); 8787 } 8788 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8789 // View was rejected last time it was drawn by its parent; this may have changed 8790 invalidateParentIfNeeded(); 8791 } 8792 } 8793 } 8794 8795 /** 8796 * The amount that the view is scaled in y around the pivot point, as a proportion of 8797 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8798 * 8799 * <p>By default, this is 1.0f. 8800 * 8801 * @see #getPivotX() 8802 * @see #getPivotY() 8803 * @return The scaling factor. 8804 */ 8805 @ViewDebug.ExportedProperty(category = "drawing") 8806 public float getScaleY() { 8807 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8808 } 8809 8810 /** 8811 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8812 * the view's unscaled width. A value of 1 means that no scaling is applied. 8813 * 8814 * @param scaleY The scaling factor. 8815 * @see #getPivotX() 8816 * @see #getPivotY() 8817 * 8818 * @attr ref android.R.styleable#View_scaleY 8819 */ 8820 public void setScaleY(float scaleY) { 8821 ensureTransformationInfo(); 8822 final TransformationInfo info = mTransformationInfo; 8823 if (info.mScaleY != scaleY) { 8824 invalidateViewProperty(true, false); 8825 info.mScaleY = scaleY; 8826 info.mMatrixDirty = true; 8827 invalidateViewProperty(false, true); 8828 if (mDisplayList != null) { 8829 mDisplayList.setScaleY(scaleY); 8830 } 8831 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8832 // View was rejected last time it was drawn by its parent; this may have changed 8833 invalidateParentIfNeeded(); 8834 } 8835 } 8836 } 8837 8838 /** 8839 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8840 * and {@link #setScaleX(float) scaled}. 8841 * 8842 * @see #getRotation() 8843 * @see #getScaleX() 8844 * @see #getScaleY() 8845 * @see #getPivotY() 8846 * @return The x location of the pivot point. 8847 * 8848 * @attr ref android.R.styleable#View_transformPivotX 8849 */ 8850 @ViewDebug.ExportedProperty(category = "drawing") 8851 public float getPivotX() { 8852 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8853 } 8854 8855 /** 8856 * Sets the x location of the point around which the view is 8857 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8858 * By default, the pivot point is centered on the object. 8859 * Setting this property disables this behavior and causes the view to use only the 8860 * explicitly set pivotX and pivotY values. 8861 * 8862 * @param pivotX The x location of the pivot point. 8863 * @see #getRotation() 8864 * @see #getScaleX() 8865 * @see #getScaleY() 8866 * @see #getPivotY() 8867 * 8868 * @attr ref android.R.styleable#View_transformPivotX 8869 */ 8870 public void setPivotX(float pivotX) { 8871 ensureTransformationInfo(); 8872 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8873 final TransformationInfo info = mTransformationInfo; 8874 if (info.mPivotX != pivotX) { 8875 invalidateViewProperty(true, false); 8876 info.mPivotX = pivotX; 8877 info.mMatrixDirty = true; 8878 invalidateViewProperty(false, true); 8879 if (mDisplayList != null) { 8880 mDisplayList.setPivotX(pivotX); 8881 } 8882 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8883 // View was rejected last time it was drawn by its parent; this may have changed 8884 invalidateParentIfNeeded(); 8885 } 8886 } 8887 } 8888 8889 /** 8890 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8891 * and {@link #setScaleY(float) scaled}. 8892 * 8893 * @see #getRotation() 8894 * @see #getScaleX() 8895 * @see #getScaleY() 8896 * @see #getPivotY() 8897 * @return The y location of the pivot point. 8898 * 8899 * @attr ref android.R.styleable#View_transformPivotY 8900 */ 8901 @ViewDebug.ExportedProperty(category = "drawing") 8902 public float getPivotY() { 8903 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8904 } 8905 8906 /** 8907 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8908 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8909 * Setting this property disables this behavior and causes the view to use only the 8910 * explicitly set pivotX and pivotY values. 8911 * 8912 * @param pivotY The y location of the pivot point. 8913 * @see #getRotation() 8914 * @see #getScaleX() 8915 * @see #getScaleY() 8916 * @see #getPivotY() 8917 * 8918 * @attr ref android.R.styleable#View_transformPivotY 8919 */ 8920 public void setPivotY(float pivotY) { 8921 ensureTransformationInfo(); 8922 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8923 final TransformationInfo info = mTransformationInfo; 8924 if (info.mPivotY != pivotY) { 8925 invalidateViewProperty(true, false); 8926 info.mPivotY = pivotY; 8927 info.mMatrixDirty = true; 8928 invalidateViewProperty(false, true); 8929 if (mDisplayList != null) { 8930 mDisplayList.setPivotY(pivotY); 8931 } 8932 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8933 // View was rejected last time it was drawn by its parent; this may have changed 8934 invalidateParentIfNeeded(); 8935 } 8936 } 8937 } 8938 8939 /** 8940 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8941 * completely transparent and 1 means the view is completely opaque. 8942 * 8943 * <p>By default this is 1.0f. 8944 * @return The opacity of the view. 8945 */ 8946 @ViewDebug.ExportedProperty(category = "drawing") 8947 public float getAlpha() { 8948 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8949 } 8950 8951 /** 8952 * Returns whether this View has content which overlaps. This function, intended to be 8953 * overridden by specific View types, is an optimization when alpha is set on a view. If 8954 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8955 * and then composited it into place, which can be expensive. If the view has no overlapping 8956 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8957 * An example of overlapping rendering is a TextView with a background image, such as a 8958 * Button. An example of non-overlapping rendering is a TextView with no background, or 8959 * an ImageView with only the foreground image. The default implementation returns true; 8960 * subclasses should override if they have cases which can be optimized. 8961 * 8962 * @return true if the content in this view might overlap, false otherwise. 8963 */ 8964 public boolean hasOverlappingRendering() { 8965 return true; 8966 } 8967 8968 /** 8969 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8970 * completely transparent and 1 means the view is completely opaque.</p> 8971 * 8972 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8973 * responsible for applying the opacity itself. Otherwise, calling this method is 8974 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8975 * setting a hardware layer.</p> 8976 * 8977 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8978 * performance implications. It is generally best to use the alpha property sparingly and 8979 * transiently, as in the case of fading animations.</p> 8980 * 8981 * @param alpha The opacity of the view. 8982 * 8983 * @see #setLayerType(int, android.graphics.Paint) 8984 * 8985 * @attr ref android.R.styleable#View_alpha 8986 */ 8987 public void setAlpha(float alpha) { 8988 ensureTransformationInfo(); 8989 if (mTransformationInfo.mAlpha != alpha) { 8990 mTransformationInfo.mAlpha = alpha; 8991 if (onSetAlpha((int) (alpha * 255))) { 8992 mPrivateFlags |= ALPHA_SET; 8993 // subclass is handling alpha - don't optimize rendering cache invalidation 8994 invalidateParentCaches(); 8995 invalidate(true); 8996 } else { 8997 mPrivateFlags &= ~ALPHA_SET; 8998 invalidateViewProperty(true, false); 8999 if (mDisplayList != null) { 9000 mDisplayList.setAlpha(alpha); 9001 } 9002 } 9003 } 9004 } 9005 9006 /** 9007 * Faster version of setAlpha() which performs the same steps except there are 9008 * no calls to invalidate(). The caller of this function should perform proper invalidation 9009 * on the parent and this object. The return value indicates whether the subclass handles 9010 * alpha (the return value for onSetAlpha()). 9011 * 9012 * @param alpha The new value for the alpha property 9013 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9014 * the new value for the alpha property is different from the old value 9015 */ 9016 boolean setAlphaNoInvalidation(float alpha) { 9017 ensureTransformationInfo(); 9018 if (mTransformationInfo.mAlpha != alpha) { 9019 mTransformationInfo.mAlpha = alpha; 9020 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9021 if (subclassHandlesAlpha) { 9022 mPrivateFlags |= ALPHA_SET; 9023 return true; 9024 } else { 9025 mPrivateFlags &= ~ALPHA_SET; 9026 if (mDisplayList != null) { 9027 mDisplayList.setAlpha(alpha); 9028 } 9029 } 9030 } 9031 return false; 9032 } 9033 9034 /** 9035 * Top position of this view relative to its parent. 9036 * 9037 * @return The top of this view, in pixels. 9038 */ 9039 @ViewDebug.CapturedViewProperty 9040 public final int getTop() { 9041 return mTop; 9042 } 9043 9044 /** 9045 * Sets the top position of this view relative to its parent. This method is meant to be called 9046 * by the layout system and should not generally be called otherwise, because the property 9047 * may be changed at any time by the layout. 9048 * 9049 * @param top The top of this view, in pixels. 9050 */ 9051 public final void setTop(int top) { 9052 if (top != mTop) { 9053 updateMatrix(); 9054 final boolean matrixIsIdentity = mTransformationInfo == null 9055 || mTransformationInfo.mMatrixIsIdentity; 9056 if (matrixIsIdentity) { 9057 if (mAttachInfo != null) { 9058 int minTop; 9059 int yLoc; 9060 if (top < mTop) { 9061 minTop = top; 9062 yLoc = top - mTop; 9063 } else { 9064 minTop = mTop; 9065 yLoc = 0; 9066 } 9067 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9068 } 9069 } else { 9070 // Double-invalidation is necessary to capture view's old and new areas 9071 invalidate(true); 9072 } 9073 9074 int width = mRight - mLeft; 9075 int oldHeight = mBottom - mTop; 9076 9077 mTop = top; 9078 if (mDisplayList != null) { 9079 mDisplayList.setTop(mTop); 9080 } 9081 9082 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9083 9084 if (!matrixIsIdentity) { 9085 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9086 // A change in dimension means an auto-centered pivot point changes, too 9087 mTransformationInfo.mMatrixDirty = true; 9088 } 9089 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9090 invalidate(true); 9091 } 9092 mBackgroundSizeChanged = true; 9093 invalidateParentIfNeeded(); 9094 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9095 // View was rejected last time it was drawn by its parent; this may have changed 9096 invalidateParentIfNeeded(); 9097 } 9098 } 9099 } 9100 9101 /** 9102 * Bottom position of this view relative to its parent. 9103 * 9104 * @return The bottom of this view, in pixels. 9105 */ 9106 @ViewDebug.CapturedViewProperty 9107 public final int getBottom() { 9108 return mBottom; 9109 } 9110 9111 /** 9112 * True if this view has changed since the last time being drawn. 9113 * 9114 * @return The dirty state of this view. 9115 */ 9116 public boolean isDirty() { 9117 return (mPrivateFlags & DIRTY_MASK) != 0; 9118 } 9119 9120 /** 9121 * Sets the bottom position of this view relative to its parent. This method is meant to be 9122 * called by the layout system and should not generally be called otherwise, because the 9123 * property may be changed at any time by the layout. 9124 * 9125 * @param bottom The bottom of this view, in pixels. 9126 */ 9127 public final void setBottom(int bottom) { 9128 if (bottom != mBottom) { 9129 updateMatrix(); 9130 final boolean matrixIsIdentity = mTransformationInfo == null 9131 || mTransformationInfo.mMatrixIsIdentity; 9132 if (matrixIsIdentity) { 9133 if (mAttachInfo != null) { 9134 int maxBottom; 9135 if (bottom < mBottom) { 9136 maxBottom = mBottom; 9137 } else { 9138 maxBottom = bottom; 9139 } 9140 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9141 } 9142 } else { 9143 // Double-invalidation is necessary to capture view's old and new areas 9144 invalidate(true); 9145 } 9146 9147 int width = mRight - mLeft; 9148 int oldHeight = mBottom - mTop; 9149 9150 mBottom = bottom; 9151 if (mDisplayList != null) { 9152 mDisplayList.setBottom(mBottom); 9153 } 9154 9155 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9156 9157 if (!matrixIsIdentity) { 9158 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9159 // A change in dimension means an auto-centered pivot point changes, too 9160 mTransformationInfo.mMatrixDirty = true; 9161 } 9162 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9163 invalidate(true); 9164 } 9165 mBackgroundSizeChanged = true; 9166 invalidateParentIfNeeded(); 9167 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9168 // View was rejected last time it was drawn by its parent; this may have changed 9169 invalidateParentIfNeeded(); 9170 } 9171 } 9172 } 9173 9174 /** 9175 * Left position of this view relative to its parent. 9176 * 9177 * @return The left edge of this view, in pixels. 9178 */ 9179 @ViewDebug.CapturedViewProperty 9180 public final int getLeft() { 9181 return mLeft; 9182 } 9183 9184 /** 9185 * Sets the left position of this view relative to its parent. This method is meant to be called 9186 * by the layout system and should not generally be called otherwise, because the property 9187 * may be changed at any time by the layout. 9188 * 9189 * @param left The bottom of this view, in pixels. 9190 */ 9191 public final void setLeft(int left) { 9192 if (left != mLeft) { 9193 updateMatrix(); 9194 final boolean matrixIsIdentity = mTransformationInfo == null 9195 || mTransformationInfo.mMatrixIsIdentity; 9196 if (matrixIsIdentity) { 9197 if (mAttachInfo != null) { 9198 int minLeft; 9199 int xLoc; 9200 if (left < mLeft) { 9201 minLeft = left; 9202 xLoc = left - mLeft; 9203 } else { 9204 minLeft = mLeft; 9205 xLoc = 0; 9206 } 9207 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9208 } 9209 } else { 9210 // Double-invalidation is necessary to capture view's old and new areas 9211 invalidate(true); 9212 } 9213 9214 int oldWidth = mRight - mLeft; 9215 int height = mBottom - mTop; 9216 9217 mLeft = left; 9218 if (mDisplayList != null) { 9219 mDisplayList.setLeft(left); 9220 } 9221 9222 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9223 9224 if (!matrixIsIdentity) { 9225 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9226 // A change in dimension means an auto-centered pivot point changes, too 9227 mTransformationInfo.mMatrixDirty = true; 9228 } 9229 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9230 invalidate(true); 9231 } 9232 mBackgroundSizeChanged = true; 9233 invalidateParentIfNeeded(); 9234 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9235 // View was rejected last time it was drawn by its parent; this may have changed 9236 invalidateParentIfNeeded(); 9237 } 9238 } 9239 } 9240 9241 /** 9242 * Right position of this view relative to its parent. 9243 * 9244 * @return The right edge of this view, in pixels. 9245 */ 9246 @ViewDebug.CapturedViewProperty 9247 public final int getRight() { 9248 return mRight; 9249 } 9250 9251 /** 9252 * Sets the right position of this view relative to its parent. This method is meant to be called 9253 * by the layout system and should not generally be called otherwise, because the property 9254 * may be changed at any time by the layout. 9255 * 9256 * @param right The bottom of this view, in pixels. 9257 */ 9258 public final void setRight(int right) { 9259 if (right != mRight) { 9260 updateMatrix(); 9261 final boolean matrixIsIdentity = mTransformationInfo == null 9262 || mTransformationInfo.mMatrixIsIdentity; 9263 if (matrixIsIdentity) { 9264 if (mAttachInfo != null) { 9265 int maxRight; 9266 if (right < mRight) { 9267 maxRight = mRight; 9268 } else { 9269 maxRight = right; 9270 } 9271 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9272 } 9273 } else { 9274 // Double-invalidation is necessary to capture view's old and new areas 9275 invalidate(true); 9276 } 9277 9278 int oldWidth = mRight - mLeft; 9279 int height = mBottom - mTop; 9280 9281 mRight = right; 9282 if (mDisplayList != null) { 9283 mDisplayList.setRight(mRight); 9284 } 9285 9286 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9287 9288 if (!matrixIsIdentity) { 9289 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9290 // A change in dimension means an auto-centered pivot point changes, too 9291 mTransformationInfo.mMatrixDirty = true; 9292 } 9293 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9294 invalidate(true); 9295 } 9296 mBackgroundSizeChanged = true; 9297 invalidateParentIfNeeded(); 9298 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9299 // View was rejected last time it was drawn by its parent; this may have changed 9300 invalidateParentIfNeeded(); 9301 } 9302 } 9303 } 9304 9305 /** 9306 * The visual x position of this view, in pixels. This is equivalent to the 9307 * {@link #setTranslationX(float) translationX} property plus the current 9308 * {@link #getLeft() left} property. 9309 * 9310 * @return The visual x position of this view, in pixels. 9311 */ 9312 @ViewDebug.ExportedProperty(category = "drawing") 9313 public float getX() { 9314 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9315 } 9316 9317 /** 9318 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9319 * {@link #setTranslationX(float) translationX} property to be the difference between 9320 * the x value passed in and the current {@link #getLeft() left} property. 9321 * 9322 * @param x The visual x position of this view, in pixels. 9323 */ 9324 public void setX(float x) { 9325 setTranslationX(x - mLeft); 9326 } 9327 9328 /** 9329 * The visual y position of this view, in pixels. This is equivalent to the 9330 * {@link #setTranslationY(float) translationY} property plus the current 9331 * {@link #getTop() top} property. 9332 * 9333 * @return The visual y position of this view, in pixels. 9334 */ 9335 @ViewDebug.ExportedProperty(category = "drawing") 9336 public float getY() { 9337 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9338 } 9339 9340 /** 9341 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9342 * {@link #setTranslationY(float) translationY} property to be the difference between 9343 * the y value passed in and the current {@link #getTop() top} property. 9344 * 9345 * @param y The visual y position of this view, in pixels. 9346 */ 9347 public void setY(float y) { 9348 setTranslationY(y - mTop); 9349 } 9350 9351 9352 /** 9353 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9354 * This position is post-layout, in addition to wherever the object's 9355 * layout placed it. 9356 * 9357 * @return The horizontal position of this view relative to its left position, in pixels. 9358 */ 9359 @ViewDebug.ExportedProperty(category = "drawing") 9360 public float getTranslationX() { 9361 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9362 } 9363 9364 /** 9365 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9366 * This effectively positions the object post-layout, in addition to wherever the object's 9367 * layout placed it. 9368 * 9369 * @param translationX The horizontal position of this view relative to its left position, 9370 * in pixels. 9371 * 9372 * @attr ref android.R.styleable#View_translationX 9373 */ 9374 public void setTranslationX(float translationX) { 9375 ensureTransformationInfo(); 9376 final TransformationInfo info = mTransformationInfo; 9377 if (info.mTranslationX != translationX) { 9378 // Double-invalidation is necessary to capture view's old and new areas 9379 invalidateViewProperty(true, false); 9380 info.mTranslationX = translationX; 9381 info.mMatrixDirty = true; 9382 invalidateViewProperty(false, true); 9383 if (mDisplayList != null) { 9384 mDisplayList.setTranslationX(translationX); 9385 } 9386 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9387 // View was rejected last time it was drawn by its parent; this may have changed 9388 invalidateParentIfNeeded(); 9389 } 9390 } 9391 } 9392 9393 /** 9394 * The horizontal location of this view relative to its {@link #getTop() top} position. 9395 * This position is post-layout, in addition to wherever the object's 9396 * layout placed it. 9397 * 9398 * @return The vertical position of this view relative to its top position, 9399 * in pixels. 9400 */ 9401 @ViewDebug.ExportedProperty(category = "drawing") 9402 public float getTranslationY() { 9403 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9404 } 9405 9406 /** 9407 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9408 * This effectively positions the object post-layout, in addition to wherever the object's 9409 * layout placed it. 9410 * 9411 * @param translationY The vertical position of this view relative to its top position, 9412 * in pixels. 9413 * 9414 * @attr ref android.R.styleable#View_translationY 9415 */ 9416 public void setTranslationY(float translationY) { 9417 ensureTransformationInfo(); 9418 final TransformationInfo info = mTransformationInfo; 9419 if (info.mTranslationY != translationY) { 9420 invalidateViewProperty(true, false); 9421 info.mTranslationY = translationY; 9422 info.mMatrixDirty = true; 9423 invalidateViewProperty(false, true); 9424 if (mDisplayList != null) { 9425 mDisplayList.setTranslationY(translationY); 9426 } 9427 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9428 // View was rejected last time it was drawn by its parent; this may have changed 9429 invalidateParentIfNeeded(); 9430 } 9431 } 9432 } 9433 9434 /** 9435 * Hit rectangle in parent's coordinates 9436 * 9437 * @param outRect The hit rectangle of the view. 9438 */ 9439 public void getHitRect(Rect outRect) { 9440 updateMatrix(); 9441 final TransformationInfo info = mTransformationInfo; 9442 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9443 outRect.set(mLeft, mTop, mRight, mBottom); 9444 } else { 9445 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9446 tmpRect.set(-info.mPivotX, -info.mPivotY, 9447 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9448 info.mMatrix.mapRect(tmpRect); 9449 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9450 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9451 } 9452 } 9453 9454 /** 9455 * Determines whether the given point, in local coordinates is inside the view. 9456 */ 9457 /*package*/ final boolean pointInView(float localX, float localY) { 9458 return localX >= 0 && localX < (mRight - mLeft) 9459 && localY >= 0 && localY < (mBottom - mTop); 9460 } 9461 9462 /** 9463 * Utility method to determine whether the given point, in local coordinates, 9464 * is inside the view, where the area of the view is expanded by the slop factor. 9465 * This method is called while processing touch-move events to determine if the event 9466 * is still within the view. 9467 */ 9468 private boolean pointInView(float localX, float localY, float slop) { 9469 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9470 localY < ((mBottom - mTop) + slop); 9471 } 9472 9473 /** 9474 * When a view has focus and the user navigates away from it, the next view is searched for 9475 * starting from the rectangle filled in by this method. 9476 * 9477 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9478 * of the view. However, if your view maintains some idea of internal selection, 9479 * such as a cursor, or a selected row or column, you should override this method and 9480 * fill in a more specific rectangle. 9481 * 9482 * @param r The rectangle to fill in, in this view's coordinates. 9483 */ 9484 public void getFocusedRect(Rect r) { 9485 getDrawingRect(r); 9486 } 9487 9488 /** 9489 * If some part of this view is not clipped by any of its parents, then 9490 * return that area in r in global (root) coordinates. To convert r to local 9491 * coordinates (without taking possible View rotations into account), offset 9492 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9493 * If the view is completely clipped or translated out, return false. 9494 * 9495 * @param r If true is returned, r holds the global coordinates of the 9496 * visible portion of this view. 9497 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9498 * between this view and its root. globalOffet may be null. 9499 * @return true if r is non-empty (i.e. part of the view is visible at the 9500 * root level. 9501 */ 9502 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9503 int width = mRight - mLeft; 9504 int height = mBottom - mTop; 9505 if (width > 0 && height > 0) { 9506 r.set(0, 0, width, height); 9507 if (globalOffset != null) { 9508 globalOffset.set(-mScrollX, -mScrollY); 9509 } 9510 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9511 } 9512 return false; 9513 } 9514 9515 public final boolean getGlobalVisibleRect(Rect r) { 9516 return getGlobalVisibleRect(r, null); 9517 } 9518 9519 public final boolean getLocalVisibleRect(Rect r) { 9520 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9521 if (getGlobalVisibleRect(r, offset)) { 9522 r.offset(-offset.x, -offset.y); // make r local 9523 return true; 9524 } 9525 return false; 9526 } 9527 9528 /** 9529 * Offset this view's vertical location by the specified number of pixels. 9530 * 9531 * @param offset the number of pixels to offset the view by 9532 */ 9533 public void offsetTopAndBottom(int offset) { 9534 if (offset != 0) { 9535 updateMatrix(); 9536 final boolean matrixIsIdentity = mTransformationInfo == null 9537 || mTransformationInfo.mMatrixIsIdentity; 9538 if (matrixIsIdentity) { 9539 if (mDisplayList != null) { 9540 invalidateViewProperty(false, false); 9541 } else { 9542 final ViewParent p = mParent; 9543 if (p != null && mAttachInfo != null) { 9544 final Rect r = mAttachInfo.mTmpInvalRect; 9545 int minTop; 9546 int maxBottom; 9547 int yLoc; 9548 if (offset < 0) { 9549 minTop = mTop + offset; 9550 maxBottom = mBottom; 9551 yLoc = offset; 9552 } else { 9553 minTop = mTop; 9554 maxBottom = mBottom + offset; 9555 yLoc = 0; 9556 } 9557 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9558 p.invalidateChild(this, r); 9559 } 9560 } 9561 } else { 9562 invalidateViewProperty(false, false); 9563 } 9564 9565 mTop += offset; 9566 mBottom += offset; 9567 if (mDisplayList != null) { 9568 mDisplayList.offsetTopBottom(offset); 9569 invalidateViewProperty(false, false); 9570 } else { 9571 if (!matrixIsIdentity) { 9572 invalidateViewProperty(false, true); 9573 } 9574 invalidateParentIfNeeded(); 9575 } 9576 } 9577 } 9578 9579 /** 9580 * Offset this view's horizontal location by the specified amount of pixels. 9581 * 9582 * @param offset the numer of pixels to offset the view by 9583 */ 9584 public void offsetLeftAndRight(int offset) { 9585 if (offset != 0) { 9586 updateMatrix(); 9587 final boolean matrixIsIdentity = mTransformationInfo == null 9588 || mTransformationInfo.mMatrixIsIdentity; 9589 if (matrixIsIdentity) { 9590 if (mDisplayList != null) { 9591 invalidateViewProperty(false, false); 9592 } else { 9593 final ViewParent p = mParent; 9594 if (p != null && mAttachInfo != null) { 9595 final Rect r = mAttachInfo.mTmpInvalRect; 9596 int minLeft; 9597 int maxRight; 9598 if (offset < 0) { 9599 minLeft = mLeft + offset; 9600 maxRight = mRight; 9601 } else { 9602 minLeft = mLeft; 9603 maxRight = mRight + offset; 9604 } 9605 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9606 p.invalidateChild(this, r); 9607 } 9608 } 9609 } else { 9610 invalidateViewProperty(false, false); 9611 } 9612 9613 mLeft += offset; 9614 mRight += offset; 9615 if (mDisplayList != null) { 9616 mDisplayList.offsetLeftRight(offset); 9617 invalidateViewProperty(false, false); 9618 } else { 9619 if (!matrixIsIdentity) { 9620 invalidateViewProperty(false, true); 9621 } 9622 invalidateParentIfNeeded(); 9623 } 9624 } 9625 } 9626 9627 /** 9628 * Get the LayoutParams associated with this view. All views should have 9629 * layout parameters. These supply parameters to the <i>parent</i> of this 9630 * view specifying how it should be arranged. There are many subclasses of 9631 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9632 * of ViewGroup that are responsible for arranging their children. 9633 * 9634 * This method may return null if this View is not attached to a parent 9635 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9636 * was not invoked successfully. When a View is attached to a parent 9637 * ViewGroup, this method must not return null. 9638 * 9639 * @return The LayoutParams associated with this view, or null if no 9640 * parameters have been set yet 9641 */ 9642 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9643 public ViewGroup.LayoutParams getLayoutParams() { 9644 return mLayoutParams; 9645 } 9646 9647 /** 9648 * Set the layout parameters associated with this view. These supply 9649 * parameters to the <i>parent</i> of this view specifying how it should be 9650 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9651 * correspond to the different subclasses of ViewGroup that are responsible 9652 * for arranging their children. 9653 * 9654 * @param params The layout parameters for this view, cannot be null 9655 */ 9656 public void setLayoutParams(ViewGroup.LayoutParams params) { 9657 if (params == null) { 9658 throw new NullPointerException("Layout parameters cannot be null"); 9659 } 9660 mLayoutParams = params; 9661 if (mParent instanceof ViewGroup) { 9662 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9663 } 9664 requestLayout(); 9665 } 9666 9667 /** 9668 * Set the scrolled position of your view. This will cause a call to 9669 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9670 * invalidated. 9671 * @param x the x position to scroll to 9672 * @param y the y position to scroll to 9673 */ 9674 public void scrollTo(int x, int y) { 9675 if (mScrollX != x || mScrollY != y) { 9676 int oldX = mScrollX; 9677 int oldY = mScrollY; 9678 mScrollX = x; 9679 mScrollY = y; 9680 invalidateParentCaches(); 9681 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9682 if (!awakenScrollBars()) { 9683 postInvalidateOnAnimation(); 9684 } 9685 } 9686 } 9687 9688 /** 9689 * Move the scrolled position of your view. This will cause a call to 9690 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9691 * invalidated. 9692 * @param x the amount of pixels to scroll by horizontally 9693 * @param y the amount of pixels to scroll by vertically 9694 */ 9695 public void scrollBy(int x, int y) { 9696 scrollTo(mScrollX + x, mScrollY + y); 9697 } 9698 9699 /** 9700 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9701 * animation to fade the scrollbars out after a default delay. If a subclass 9702 * provides animated scrolling, the start delay should equal the duration 9703 * of the scrolling animation.</p> 9704 * 9705 * <p>The animation starts only if at least one of the scrollbars is 9706 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9707 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9708 * this method returns true, and false otherwise. If the animation is 9709 * started, this method calls {@link #invalidate()}; in that case the 9710 * caller should not call {@link #invalidate()}.</p> 9711 * 9712 * <p>This method should be invoked every time a subclass directly updates 9713 * the scroll parameters.</p> 9714 * 9715 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9716 * and {@link #scrollTo(int, int)}.</p> 9717 * 9718 * @return true if the animation is played, false otherwise 9719 * 9720 * @see #awakenScrollBars(int) 9721 * @see #scrollBy(int, int) 9722 * @see #scrollTo(int, int) 9723 * @see #isHorizontalScrollBarEnabled() 9724 * @see #isVerticalScrollBarEnabled() 9725 * @see #setHorizontalScrollBarEnabled(boolean) 9726 * @see #setVerticalScrollBarEnabled(boolean) 9727 */ 9728 protected boolean awakenScrollBars() { 9729 return mScrollCache != null && 9730 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9731 } 9732 9733 /** 9734 * Trigger the scrollbars to draw. 9735 * This method differs from awakenScrollBars() only in its default duration. 9736 * initialAwakenScrollBars() will show the scroll bars for longer than 9737 * usual to give the user more of a chance to notice them. 9738 * 9739 * @return true if the animation is played, false otherwise. 9740 */ 9741 private boolean initialAwakenScrollBars() { 9742 return mScrollCache != null && 9743 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9744 } 9745 9746 /** 9747 * <p> 9748 * Trigger the scrollbars to draw. When invoked this method starts an 9749 * animation to fade the scrollbars out after a fixed delay. If a subclass 9750 * provides animated scrolling, the start delay should equal the duration of 9751 * the scrolling animation. 9752 * </p> 9753 * 9754 * <p> 9755 * The animation starts only if at least one of the scrollbars is enabled, 9756 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9757 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9758 * this method returns true, and false otherwise. If the animation is 9759 * started, this method calls {@link #invalidate()}; in that case the caller 9760 * should not call {@link #invalidate()}. 9761 * </p> 9762 * 9763 * <p> 9764 * This method should be invoked everytime a subclass directly updates the 9765 * scroll parameters. 9766 * </p> 9767 * 9768 * @param startDelay the delay, in milliseconds, after which the animation 9769 * should start; when the delay is 0, the animation starts 9770 * immediately 9771 * @return true if the animation is played, false otherwise 9772 * 9773 * @see #scrollBy(int, int) 9774 * @see #scrollTo(int, int) 9775 * @see #isHorizontalScrollBarEnabled() 9776 * @see #isVerticalScrollBarEnabled() 9777 * @see #setHorizontalScrollBarEnabled(boolean) 9778 * @see #setVerticalScrollBarEnabled(boolean) 9779 */ 9780 protected boolean awakenScrollBars(int startDelay) { 9781 return awakenScrollBars(startDelay, true); 9782 } 9783 9784 /** 9785 * <p> 9786 * Trigger the scrollbars to draw. When invoked this method starts an 9787 * animation to fade the scrollbars out after a fixed delay. If a subclass 9788 * provides animated scrolling, the start delay should equal the duration of 9789 * the scrolling animation. 9790 * </p> 9791 * 9792 * <p> 9793 * The animation starts only if at least one of the scrollbars is enabled, 9794 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9795 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9796 * this method returns true, and false otherwise. If the animation is 9797 * started, this method calls {@link #invalidate()} if the invalidate parameter 9798 * is set to true; in that case the caller 9799 * should not call {@link #invalidate()}. 9800 * </p> 9801 * 9802 * <p> 9803 * This method should be invoked everytime a subclass directly updates the 9804 * scroll parameters. 9805 * </p> 9806 * 9807 * @param startDelay the delay, in milliseconds, after which the animation 9808 * should start; when the delay is 0, the animation starts 9809 * immediately 9810 * 9811 * @param invalidate Wheter this method should call invalidate 9812 * 9813 * @return true if the animation is played, false otherwise 9814 * 9815 * @see #scrollBy(int, int) 9816 * @see #scrollTo(int, int) 9817 * @see #isHorizontalScrollBarEnabled() 9818 * @see #isVerticalScrollBarEnabled() 9819 * @see #setHorizontalScrollBarEnabled(boolean) 9820 * @see #setVerticalScrollBarEnabled(boolean) 9821 */ 9822 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9823 final ScrollabilityCache scrollCache = mScrollCache; 9824 9825 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9826 return false; 9827 } 9828 9829 if (scrollCache.scrollBar == null) { 9830 scrollCache.scrollBar = new ScrollBarDrawable(); 9831 } 9832 9833 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9834 9835 if (invalidate) { 9836 // Invalidate to show the scrollbars 9837 postInvalidateOnAnimation(); 9838 } 9839 9840 if (scrollCache.state == ScrollabilityCache.OFF) { 9841 // FIXME: this is copied from WindowManagerService. 9842 // We should get this value from the system when it 9843 // is possible to do so. 9844 final int KEY_REPEAT_FIRST_DELAY = 750; 9845 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9846 } 9847 9848 // Tell mScrollCache when we should start fading. This may 9849 // extend the fade start time if one was already scheduled 9850 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9851 scrollCache.fadeStartTime = fadeStartTime; 9852 scrollCache.state = ScrollabilityCache.ON; 9853 9854 // Schedule our fader to run, unscheduling any old ones first 9855 if (mAttachInfo != null) { 9856 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9857 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9858 } 9859 9860 return true; 9861 } 9862 9863 return false; 9864 } 9865 9866 /** 9867 * Do not invalidate views which are not visible and which are not running an animation. They 9868 * will not get drawn and they should not set dirty flags as if they will be drawn 9869 */ 9870 private boolean skipInvalidate() { 9871 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9872 (!(mParent instanceof ViewGroup) || 9873 !((ViewGroup) mParent).isViewTransitioning(this)); 9874 } 9875 /** 9876 * Mark the area defined by dirty as needing to be drawn. If the view is 9877 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9878 * in the future. This must be called from a UI thread. To call from a non-UI 9879 * thread, call {@link #postInvalidate()}. 9880 * 9881 * WARNING: This method is destructive to dirty. 9882 * @param dirty the rectangle representing the bounds of the dirty region 9883 */ 9884 public void invalidate(Rect dirty) { 9885 if (skipInvalidate()) { 9886 return; 9887 } 9888 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9889 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9890 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9891 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9892 mPrivateFlags |= INVALIDATED; 9893 mPrivateFlags |= DIRTY; 9894 final ViewParent p = mParent; 9895 final AttachInfo ai = mAttachInfo; 9896 //noinspection PointlessBooleanExpression,ConstantConditions 9897 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9898 if (p != null && ai != null && ai.mHardwareAccelerated) { 9899 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9900 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9901 p.invalidateChild(this, null); 9902 return; 9903 } 9904 } 9905 if (p != null && ai != null) { 9906 final int scrollX = mScrollX; 9907 final int scrollY = mScrollY; 9908 final Rect r = ai.mTmpInvalRect; 9909 r.set(dirty.left - scrollX, dirty.top - scrollY, 9910 dirty.right - scrollX, dirty.bottom - scrollY); 9911 mParent.invalidateChild(this, r); 9912 } 9913 } 9914 } 9915 9916 /** 9917 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9918 * The coordinates of the dirty rect are relative to the view. 9919 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9920 * will be called at some point in the future. This must be called from 9921 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9922 * @param l the left position of the dirty region 9923 * @param t the top position of the dirty region 9924 * @param r the right position of the dirty region 9925 * @param b the bottom position of the dirty region 9926 */ 9927 public void invalidate(int l, int t, int r, int b) { 9928 if (skipInvalidate()) { 9929 return; 9930 } 9931 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9932 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9933 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9934 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9935 mPrivateFlags |= INVALIDATED; 9936 mPrivateFlags |= DIRTY; 9937 final ViewParent p = mParent; 9938 final AttachInfo ai = mAttachInfo; 9939 //noinspection PointlessBooleanExpression,ConstantConditions 9940 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9941 if (p != null && ai != null && ai.mHardwareAccelerated) { 9942 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9943 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9944 p.invalidateChild(this, null); 9945 return; 9946 } 9947 } 9948 if (p != null && ai != null && l < r && t < b) { 9949 final int scrollX = mScrollX; 9950 final int scrollY = mScrollY; 9951 final Rect tmpr = ai.mTmpInvalRect; 9952 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9953 p.invalidateChild(this, tmpr); 9954 } 9955 } 9956 } 9957 9958 /** 9959 * Invalidate the whole view. If the view is visible, 9960 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9961 * the future. This must be called from a UI thread. To call from a non-UI thread, 9962 * call {@link #postInvalidate()}. 9963 */ 9964 public void invalidate() { 9965 invalidate(true); 9966 } 9967 9968 /** 9969 * This is where the invalidate() work actually happens. A full invalidate() 9970 * causes the drawing cache to be invalidated, but this function can be called with 9971 * invalidateCache set to false to skip that invalidation step for cases that do not 9972 * need it (for example, a component that remains at the same dimensions with the same 9973 * content). 9974 * 9975 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9976 * well. This is usually true for a full invalidate, but may be set to false if the 9977 * View's contents or dimensions have not changed. 9978 */ 9979 void invalidate(boolean invalidateCache) { 9980 if (skipInvalidate()) { 9981 return; 9982 } 9983 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9984 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9985 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9986 mLastIsOpaque = isOpaque(); 9987 mPrivateFlags &= ~DRAWN; 9988 mPrivateFlags |= DIRTY; 9989 if (invalidateCache) { 9990 mPrivateFlags |= INVALIDATED; 9991 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9992 } 9993 final AttachInfo ai = mAttachInfo; 9994 final ViewParent p = mParent; 9995 //noinspection PointlessBooleanExpression,ConstantConditions 9996 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9997 if (p != null && ai != null && ai.mHardwareAccelerated) { 9998 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9999 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10000 p.invalidateChild(this, null); 10001 return; 10002 } 10003 } 10004 10005 if (p != null && ai != null) { 10006 final Rect r = ai.mTmpInvalRect; 10007 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10008 // Don't call invalidate -- we don't want to internally scroll 10009 // our own bounds 10010 p.invalidateChild(this, r); 10011 } 10012 } 10013 } 10014 10015 /** 10016 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10017 * set any flags or handle all of the cases handled by the default invalidation methods. 10018 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10019 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10020 * walk up the hierarchy, transforming the dirty rect as necessary. 10021 * 10022 * The method also handles normal invalidation logic if display list properties are not 10023 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10024 * backup approach, to handle these cases used in the various property-setting methods. 10025 * 10026 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10027 * are not being used in this view 10028 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10029 * list properties are not being used in this view 10030 */ 10031 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10032 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10033 if (invalidateParent) { 10034 invalidateParentCaches(); 10035 } 10036 if (forceRedraw) { 10037 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10038 } 10039 invalidate(false); 10040 } else { 10041 final AttachInfo ai = mAttachInfo; 10042 final ViewParent p = mParent; 10043 if (p != null && ai != null) { 10044 final Rect r = ai.mTmpInvalRect; 10045 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10046 if (mParent instanceof ViewGroup) { 10047 ((ViewGroup) mParent).invalidateChildFast(this, r); 10048 } else { 10049 mParent.invalidateChild(this, r); 10050 } 10051 } 10052 } 10053 } 10054 10055 /** 10056 * Utility method to transform a given Rect by the current matrix of this view. 10057 */ 10058 void transformRect(final Rect rect) { 10059 if (!getMatrix().isIdentity()) { 10060 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10061 boundingRect.set(rect); 10062 getMatrix().mapRect(boundingRect); 10063 rect.set((int) (boundingRect.left - 0.5f), 10064 (int) (boundingRect.top - 0.5f), 10065 (int) (boundingRect.right + 0.5f), 10066 (int) (boundingRect.bottom + 0.5f)); 10067 } 10068 } 10069 10070 /** 10071 * Used to indicate that the parent of this view should clear its caches. This functionality 10072 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10073 * which is necessary when various parent-managed properties of the view change, such as 10074 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10075 * clears the parent caches and does not causes an invalidate event. 10076 * 10077 * @hide 10078 */ 10079 protected void invalidateParentCaches() { 10080 if (mParent instanceof View) { 10081 ((View) mParent).mPrivateFlags |= INVALIDATED; 10082 } 10083 } 10084 10085 /** 10086 * Used to indicate that the parent of this view should be invalidated. This functionality 10087 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10088 * which is necessary when various parent-managed properties of the view change, such as 10089 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10090 * an invalidation event to the parent. 10091 * 10092 * @hide 10093 */ 10094 protected void invalidateParentIfNeeded() { 10095 if (isHardwareAccelerated() && mParent instanceof View) { 10096 ((View) mParent).invalidate(true); 10097 } 10098 } 10099 10100 /** 10101 * Indicates whether this View is opaque. An opaque View guarantees that it will 10102 * draw all the pixels overlapping its bounds using a fully opaque color. 10103 * 10104 * Subclasses of View should override this method whenever possible to indicate 10105 * whether an instance is opaque. Opaque Views are treated in a special way by 10106 * the View hierarchy, possibly allowing it to perform optimizations during 10107 * invalidate/draw passes. 10108 * 10109 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10110 */ 10111 @ViewDebug.ExportedProperty(category = "drawing") 10112 public boolean isOpaque() { 10113 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10114 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10115 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10116 } 10117 10118 /** 10119 * @hide 10120 */ 10121 protected void computeOpaqueFlags() { 10122 // Opaque if: 10123 // - Has a background 10124 // - Background is opaque 10125 // - Doesn't have scrollbars or scrollbars are inside overlay 10126 10127 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10128 mPrivateFlags |= OPAQUE_BACKGROUND; 10129 } else { 10130 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10131 } 10132 10133 final int flags = mViewFlags; 10134 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10135 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10136 mPrivateFlags |= OPAQUE_SCROLLBARS; 10137 } else { 10138 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10139 } 10140 } 10141 10142 /** 10143 * @hide 10144 */ 10145 protected boolean hasOpaqueScrollbars() { 10146 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10147 } 10148 10149 /** 10150 * @return A handler associated with the thread running the View. This 10151 * handler can be used to pump events in the UI events queue. 10152 */ 10153 public Handler getHandler() { 10154 if (mAttachInfo != null) { 10155 return mAttachInfo.mHandler; 10156 } 10157 return null; 10158 } 10159 10160 /** 10161 * Gets the view root associated with the View. 10162 * @return The view root, or null if none. 10163 * @hide 10164 */ 10165 public ViewRootImpl getViewRootImpl() { 10166 if (mAttachInfo != null) { 10167 return mAttachInfo.mViewRootImpl; 10168 } 10169 return null; 10170 } 10171 10172 /** 10173 * <p>Causes the Runnable to be added to the message queue. 10174 * The runnable will be run on the user interface thread.</p> 10175 * 10176 * <p>This method can be invoked from outside of the UI thread 10177 * only when this View is attached to a window.</p> 10178 * 10179 * @param action The Runnable that will be executed. 10180 * 10181 * @return Returns true if the Runnable was successfully placed in to the 10182 * message queue. Returns false on failure, usually because the 10183 * looper processing the message queue is exiting. 10184 * 10185 * @see #postDelayed 10186 * @see #removeCallbacks 10187 */ 10188 public boolean post(Runnable action) { 10189 final AttachInfo attachInfo = mAttachInfo; 10190 if (attachInfo != null) { 10191 return attachInfo.mHandler.post(action); 10192 } 10193 // Assume that post will succeed later 10194 ViewRootImpl.getRunQueue().post(action); 10195 return true; 10196 } 10197 10198 /** 10199 * <p>Causes the Runnable to be added to the message queue, to be run 10200 * after the specified amount of time elapses. 10201 * The runnable will be run on the user interface thread.</p> 10202 * 10203 * <p>This method can be invoked from outside of the UI thread 10204 * only when this View is attached to a window.</p> 10205 * 10206 * @param action The Runnable that will be executed. 10207 * @param delayMillis The delay (in milliseconds) until the Runnable 10208 * will be executed. 10209 * 10210 * @return true if the Runnable was successfully placed in to the 10211 * message queue. Returns false on failure, usually because the 10212 * looper processing the message queue is exiting. Note that a 10213 * result of true does not mean the Runnable will be processed -- 10214 * if the looper is quit before the delivery time of the message 10215 * occurs then the message will be dropped. 10216 * 10217 * @see #post 10218 * @see #removeCallbacks 10219 */ 10220 public boolean postDelayed(Runnable action, long delayMillis) { 10221 final AttachInfo attachInfo = mAttachInfo; 10222 if (attachInfo != null) { 10223 return attachInfo.mHandler.postDelayed(action, delayMillis); 10224 } 10225 // Assume that post will succeed later 10226 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10227 return true; 10228 } 10229 10230 /** 10231 * <p>Causes the Runnable to execute on the next animation time step. 10232 * The runnable will be run on the user interface thread.</p> 10233 * 10234 * <p>This method can be invoked from outside of the UI thread 10235 * only when this View is attached to a window.</p> 10236 * 10237 * @param action The Runnable that will be executed. 10238 * 10239 * @see #postOnAnimationDelayed 10240 * @see #removeCallbacks 10241 */ 10242 public void postOnAnimation(Runnable action) { 10243 final AttachInfo attachInfo = mAttachInfo; 10244 if (attachInfo != null) { 10245 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10246 Choreographer.CALLBACK_ANIMATION, action, null); 10247 } else { 10248 // Assume that post will succeed later 10249 ViewRootImpl.getRunQueue().post(action); 10250 } 10251 } 10252 10253 /** 10254 * <p>Causes the Runnable to execute on the next animation time step, 10255 * after the specified amount of time elapses. 10256 * The runnable will be run on the user interface thread.</p> 10257 * 10258 * <p>This method can be invoked from outside of the UI thread 10259 * only when this View is attached to a window.</p> 10260 * 10261 * @param action The Runnable that will be executed. 10262 * @param delayMillis The delay (in milliseconds) until the Runnable 10263 * will be executed. 10264 * 10265 * @see #postOnAnimation 10266 * @see #removeCallbacks 10267 */ 10268 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10269 final AttachInfo attachInfo = mAttachInfo; 10270 if (attachInfo != null) { 10271 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10272 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10273 } else { 10274 // Assume that post will succeed later 10275 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10276 } 10277 } 10278 10279 /** 10280 * <p>Removes the specified Runnable from the message queue.</p> 10281 * 10282 * <p>This method can be invoked from outside of the UI thread 10283 * only when this View is attached to a window.</p> 10284 * 10285 * @param action The Runnable to remove from the message handling queue 10286 * 10287 * @return true if this view could ask the Handler to remove the Runnable, 10288 * false otherwise. When the returned value is true, the Runnable 10289 * may or may not have been actually removed from the message queue 10290 * (for instance, if the Runnable was not in the queue already.) 10291 * 10292 * @see #post 10293 * @see #postDelayed 10294 * @see #postOnAnimation 10295 * @see #postOnAnimationDelayed 10296 */ 10297 public boolean removeCallbacks(Runnable action) { 10298 if (action != null) { 10299 final AttachInfo attachInfo = mAttachInfo; 10300 if (attachInfo != null) { 10301 attachInfo.mHandler.removeCallbacks(action); 10302 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10303 Choreographer.CALLBACK_ANIMATION, action, null); 10304 } else { 10305 // Assume that post will succeed later 10306 ViewRootImpl.getRunQueue().removeCallbacks(action); 10307 } 10308 } 10309 return true; 10310 } 10311 10312 /** 10313 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10314 * Use this to invalidate the View from a non-UI thread.</p> 10315 * 10316 * <p>This method can be invoked from outside of the UI thread 10317 * only when this View is attached to a window.</p> 10318 * 10319 * @see #invalidate() 10320 * @see #postInvalidateDelayed(long) 10321 */ 10322 public void postInvalidate() { 10323 postInvalidateDelayed(0); 10324 } 10325 10326 /** 10327 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10328 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10329 * 10330 * <p>This method can be invoked from outside of the UI thread 10331 * only when this View is attached to a window.</p> 10332 * 10333 * @param left The left coordinate of the rectangle to invalidate. 10334 * @param top The top coordinate of the rectangle to invalidate. 10335 * @param right The right coordinate of the rectangle to invalidate. 10336 * @param bottom The bottom coordinate of the rectangle to invalidate. 10337 * 10338 * @see #invalidate(int, int, int, int) 10339 * @see #invalidate(Rect) 10340 * @see #postInvalidateDelayed(long, int, int, int, int) 10341 */ 10342 public void postInvalidate(int left, int top, int right, int bottom) { 10343 postInvalidateDelayed(0, left, top, right, bottom); 10344 } 10345 10346 /** 10347 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10348 * loop. Waits for the specified amount of time.</p> 10349 * 10350 * <p>This method can be invoked from outside of the UI thread 10351 * only when this View is attached to a window.</p> 10352 * 10353 * @param delayMilliseconds the duration in milliseconds to delay the 10354 * invalidation by 10355 * 10356 * @see #invalidate() 10357 * @see #postInvalidate() 10358 */ 10359 public void postInvalidateDelayed(long delayMilliseconds) { 10360 // We try only with the AttachInfo because there's no point in invalidating 10361 // if we are not attached to our window 10362 final AttachInfo attachInfo = mAttachInfo; 10363 if (attachInfo != null) { 10364 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10365 } 10366 } 10367 10368 /** 10369 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10370 * through the event loop. Waits for the specified amount of time.</p> 10371 * 10372 * <p>This method can be invoked from outside of the UI thread 10373 * only when this View is attached to a window.</p> 10374 * 10375 * @param delayMilliseconds the duration in milliseconds to delay the 10376 * invalidation by 10377 * @param left The left coordinate of the rectangle to invalidate. 10378 * @param top The top coordinate of the rectangle to invalidate. 10379 * @param right The right coordinate of the rectangle to invalidate. 10380 * @param bottom The bottom coordinate of the rectangle to invalidate. 10381 * 10382 * @see #invalidate(int, int, int, int) 10383 * @see #invalidate(Rect) 10384 * @see #postInvalidate(int, int, int, int) 10385 */ 10386 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10387 int right, int bottom) { 10388 10389 // We try only with the AttachInfo because there's no point in invalidating 10390 // if we are not attached to our window 10391 final AttachInfo attachInfo = mAttachInfo; 10392 if (attachInfo != null) { 10393 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10394 info.target = this; 10395 info.left = left; 10396 info.top = top; 10397 info.right = right; 10398 info.bottom = bottom; 10399 10400 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10401 } 10402 } 10403 10404 /** 10405 * <p>Cause an invalidate to happen on the next animation time step, typically the 10406 * next display frame.</p> 10407 * 10408 * <p>This method can be invoked from outside of the UI thread 10409 * only when this View is attached to a window.</p> 10410 * 10411 * @see #invalidate() 10412 */ 10413 public void postInvalidateOnAnimation() { 10414 // We try only with the AttachInfo because there's no point in invalidating 10415 // if we are not attached to our window 10416 final AttachInfo attachInfo = mAttachInfo; 10417 if (attachInfo != null) { 10418 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10419 } 10420 } 10421 10422 /** 10423 * <p>Cause an invalidate of the specified area to happen on the next animation 10424 * time step, typically the next display frame.</p> 10425 * 10426 * <p>This method can be invoked from outside of the UI thread 10427 * only when this View is attached to a window.</p> 10428 * 10429 * @param left The left coordinate of the rectangle to invalidate. 10430 * @param top The top coordinate of the rectangle to invalidate. 10431 * @param right The right coordinate of the rectangle to invalidate. 10432 * @param bottom The bottom coordinate of the rectangle to invalidate. 10433 * 10434 * @see #invalidate(int, int, int, int) 10435 * @see #invalidate(Rect) 10436 */ 10437 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10438 // We try only with the AttachInfo because there's no point in invalidating 10439 // if we are not attached to our window 10440 final AttachInfo attachInfo = mAttachInfo; 10441 if (attachInfo != null) { 10442 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10443 info.target = this; 10444 info.left = left; 10445 info.top = top; 10446 info.right = right; 10447 info.bottom = bottom; 10448 10449 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10450 } 10451 } 10452 10453 /** 10454 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10455 * This event is sent at most once every 10456 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10457 */ 10458 private void postSendViewScrolledAccessibilityEventCallback() { 10459 if (mSendViewScrolledAccessibilityEvent == null) { 10460 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10461 } 10462 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10463 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10464 postDelayed(mSendViewScrolledAccessibilityEvent, 10465 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10466 } 10467 } 10468 10469 /** 10470 * Called by a parent to request that a child update its values for mScrollX 10471 * and mScrollY if necessary. This will typically be done if the child is 10472 * animating a scroll using a {@link android.widget.Scroller Scroller} 10473 * object. 10474 */ 10475 public void computeScroll() { 10476 } 10477 10478 /** 10479 * <p>Indicate whether the horizontal edges are faded when the view is 10480 * scrolled horizontally.</p> 10481 * 10482 * @return true if the horizontal edges should are faded on scroll, false 10483 * otherwise 10484 * 10485 * @see #setHorizontalFadingEdgeEnabled(boolean) 10486 * 10487 * @attr ref android.R.styleable#View_requiresFadingEdge 10488 */ 10489 public boolean isHorizontalFadingEdgeEnabled() { 10490 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10491 } 10492 10493 /** 10494 * <p>Define whether the horizontal edges should be faded when this view 10495 * is scrolled horizontally.</p> 10496 * 10497 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10498 * be faded when the view is scrolled 10499 * horizontally 10500 * 10501 * @see #isHorizontalFadingEdgeEnabled() 10502 * 10503 * @attr ref android.R.styleable#View_requiresFadingEdge 10504 */ 10505 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10506 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10507 if (horizontalFadingEdgeEnabled) { 10508 initScrollCache(); 10509 } 10510 10511 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10512 } 10513 } 10514 10515 /** 10516 * <p>Indicate whether the vertical edges are faded when the view is 10517 * scrolled horizontally.</p> 10518 * 10519 * @return true if the vertical edges should are faded on scroll, false 10520 * otherwise 10521 * 10522 * @see #setVerticalFadingEdgeEnabled(boolean) 10523 * 10524 * @attr ref android.R.styleable#View_requiresFadingEdge 10525 */ 10526 public boolean isVerticalFadingEdgeEnabled() { 10527 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10528 } 10529 10530 /** 10531 * <p>Define whether the vertical edges should be faded when this view 10532 * is scrolled vertically.</p> 10533 * 10534 * @param verticalFadingEdgeEnabled true if the vertical edges should 10535 * be faded when the view is scrolled 10536 * vertically 10537 * 10538 * @see #isVerticalFadingEdgeEnabled() 10539 * 10540 * @attr ref android.R.styleable#View_requiresFadingEdge 10541 */ 10542 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10543 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10544 if (verticalFadingEdgeEnabled) { 10545 initScrollCache(); 10546 } 10547 10548 mViewFlags ^= FADING_EDGE_VERTICAL; 10549 } 10550 } 10551 10552 /** 10553 * Returns the strength, or intensity, of the top faded edge. The strength is 10554 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10555 * returns 0.0 or 1.0 but no value in between. 10556 * 10557 * Subclasses should override this method to provide a smoother fade transition 10558 * when scrolling occurs. 10559 * 10560 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10561 */ 10562 protected float getTopFadingEdgeStrength() { 10563 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10564 } 10565 10566 /** 10567 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10568 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10569 * returns 0.0 or 1.0 but no value in between. 10570 * 10571 * Subclasses should override this method to provide a smoother fade transition 10572 * when scrolling occurs. 10573 * 10574 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10575 */ 10576 protected float getBottomFadingEdgeStrength() { 10577 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10578 computeVerticalScrollRange() ? 1.0f : 0.0f; 10579 } 10580 10581 /** 10582 * Returns the strength, or intensity, of the left faded edge. The strength is 10583 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10584 * returns 0.0 or 1.0 but no value in between. 10585 * 10586 * Subclasses should override this method to provide a smoother fade transition 10587 * when scrolling occurs. 10588 * 10589 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10590 */ 10591 protected float getLeftFadingEdgeStrength() { 10592 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10593 } 10594 10595 /** 10596 * Returns the strength, or intensity, of the right faded edge. The strength is 10597 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10598 * returns 0.0 or 1.0 but no value in between. 10599 * 10600 * Subclasses should override this method to provide a smoother fade transition 10601 * when scrolling occurs. 10602 * 10603 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10604 */ 10605 protected float getRightFadingEdgeStrength() { 10606 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10607 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10608 } 10609 10610 /** 10611 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10612 * scrollbar is not drawn by default.</p> 10613 * 10614 * @return true if the horizontal scrollbar should be painted, false 10615 * otherwise 10616 * 10617 * @see #setHorizontalScrollBarEnabled(boolean) 10618 */ 10619 public boolean isHorizontalScrollBarEnabled() { 10620 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10621 } 10622 10623 /** 10624 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10625 * scrollbar is not drawn by default.</p> 10626 * 10627 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10628 * be painted 10629 * 10630 * @see #isHorizontalScrollBarEnabled() 10631 */ 10632 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10633 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10634 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10635 computeOpaqueFlags(); 10636 resolvePadding(); 10637 } 10638 } 10639 10640 /** 10641 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10642 * scrollbar is not drawn by default.</p> 10643 * 10644 * @return true if the vertical scrollbar should be painted, false 10645 * otherwise 10646 * 10647 * @see #setVerticalScrollBarEnabled(boolean) 10648 */ 10649 public boolean isVerticalScrollBarEnabled() { 10650 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10651 } 10652 10653 /** 10654 * <p>Define whether the vertical scrollbar should be drawn or not. The 10655 * scrollbar is not drawn by default.</p> 10656 * 10657 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10658 * be painted 10659 * 10660 * @see #isVerticalScrollBarEnabled() 10661 */ 10662 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10663 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10664 mViewFlags ^= SCROLLBARS_VERTICAL; 10665 computeOpaqueFlags(); 10666 resolvePadding(); 10667 } 10668 } 10669 10670 /** 10671 * @hide 10672 */ 10673 protected void recomputePadding() { 10674 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10675 } 10676 10677 /** 10678 * Define whether scrollbars will fade when the view is not scrolling. 10679 * 10680 * @param fadeScrollbars wheter to enable fading 10681 * 10682 * @attr ref android.R.styleable#View_fadeScrollbars 10683 */ 10684 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10685 initScrollCache(); 10686 final ScrollabilityCache scrollabilityCache = mScrollCache; 10687 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10688 if (fadeScrollbars) { 10689 scrollabilityCache.state = ScrollabilityCache.OFF; 10690 } else { 10691 scrollabilityCache.state = ScrollabilityCache.ON; 10692 } 10693 } 10694 10695 /** 10696 * 10697 * Returns true if scrollbars will fade when this view is not scrolling 10698 * 10699 * @return true if scrollbar fading is enabled 10700 * 10701 * @attr ref android.R.styleable#View_fadeScrollbars 10702 */ 10703 public boolean isScrollbarFadingEnabled() { 10704 return mScrollCache != null && mScrollCache.fadeScrollBars; 10705 } 10706 10707 /** 10708 * 10709 * Returns the delay before scrollbars fade. 10710 * 10711 * @return the delay before scrollbars fade 10712 * 10713 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10714 */ 10715 public int getScrollBarDefaultDelayBeforeFade() { 10716 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10717 mScrollCache.scrollBarDefaultDelayBeforeFade; 10718 } 10719 10720 /** 10721 * Define the delay before scrollbars fade. 10722 * 10723 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10724 * 10725 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10726 */ 10727 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10728 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10729 } 10730 10731 /** 10732 * 10733 * Returns the scrollbar fade duration. 10734 * 10735 * @return the scrollbar fade duration 10736 * 10737 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10738 */ 10739 public int getScrollBarFadeDuration() { 10740 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10741 mScrollCache.scrollBarFadeDuration; 10742 } 10743 10744 /** 10745 * Define the scrollbar fade duration. 10746 * 10747 * @param scrollBarFadeDuration - the scrollbar fade duration 10748 * 10749 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10750 */ 10751 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10752 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10753 } 10754 10755 /** 10756 * 10757 * Returns the scrollbar size. 10758 * 10759 * @return the scrollbar size 10760 * 10761 * @attr ref android.R.styleable#View_scrollbarSize 10762 */ 10763 public int getScrollBarSize() { 10764 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10765 mScrollCache.scrollBarSize; 10766 } 10767 10768 /** 10769 * Define the scrollbar size. 10770 * 10771 * @param scrollBarSize - the scrollbar size 10772 * 10773 * @attr ref android.R.styleable#View_scrollbarSize 10774 */ 10775 public void setScrollBarSize(int scrollBarSize) { 10776 getScrollCache().scrollBarSize = scrollBarSize; 10777 } 10778 10779 /** 10780 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10781 * inset. When inset, they add to the padding of the view. And the scrollbars 10782 * can be drawn inside the padding area or on the edge of the view. For example, 10783 * if a view has a background drawable and you want to draw the scrollbars 10784 * inside the padding specified by the drawable, you can use 10785 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10786 * appear at the edge of the view, ignoring the padding, then you can use 10787 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10788 * @param style the style of the scrollbars. Should be one of 10789 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10790 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10791 * @see #SCROLLBARS_INSIDE_OVERLAY 10792 * @see #SCROLLBARS_INSIDE_INSET 10793 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10794 * @see #SCROLLBARS_OUTSIDE_INSET 10795 * 10796 * @attr ref android.R.styleable#View_scrollbarStyle 10797 */ 10798 public void setScrollBarStyle(int style) { 10799 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10800 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10801 computeOpaqueFlags(); 10802 resolvePadding(); 10803 } 10804 } 10805 10806 /** 10807 * <p>Returns the current scrollbar style.</p> 10808 * @return the current scrollbar style 10809 * @see #SCROLLBARS_INSIDE_OVERLAY 10810 * @see #SCROLLBARS_INSIDE_INSET 10811 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10812 * @see #SCROLLBARS_OUTSIDE_INSET 10813 * 10814 * @attr ref android.R.styleable#View_scrollbarStyle 10815 */ 10816 @ViewDebug.ExportedProperty(mapping = { 10817 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10818 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10819 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10820 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10821 }) 10822 public int getScrollBarStyle() { 10823 return mViewFlags & SCROLLBARS_STYLE_MASK; 10824 } 10825 10826 /** 10827 * <p>Compute the horizontal range that the horizontal scrollbar 10828 * represents.</p> 10829 * 10830 * <p>The range is expressed in arbitrary units that must be the same as the 10831 * units used by {@link #computeHorizontalScrollExtent()} and 10832 * {@link #computeHorizontalScrollOffset()}.</p> 10833 * 10834 * <p>The default range is the drawing width of this view.</p> 10835 * 10836 * @return the total horizontal range represented by the horizontal 10837 * scrollbar 10838 * 10839 * @see #computeHorizontalScrollExtent() 10840 * @see #computeHorizontalScrollOffset() 10841 * @see android.widget.ScrollBarDrawable 10842 */ 10843 protected int computeHorizontalScrollRange() { 10844 return getWidth(); 10845 } 10846 10847 /** 10848 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10849 * within the horizontal range. This value is used to compute the position 10850 * of the thumb within the scrollbar's track.</p> 10851 * 10852 * <p>The range is expressed in arbitrary units that must be the same as the 10853 * units used by {@link #computeHorizontalScrollRange()} and 10854 * {@link #computeHorizontalScrollExtent()}.</p> 10855 * 10856 * <p>The default offset is the scroll offset of this view.</p> 10857 * 10858 * @return the horizontal offset of the scrollbar's thumb 10859 * 10860 * @see #computeHorizontalScrollRange() 10861 * @see #computeHorizontalScrollExtent() 10862 * @see android.widget.ScrollBarDrawable 10863 */ 10864 protected int computeHorizontalScrollOffset() { 10865 return mScrollX; 10866 } 10867 10868 /** 10869 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10870 * within the horizontal range. This value is used to compute the length 10871 * of the thumb within the scrollbar's track.</p> 10872 * 10873 * <p>The range is expressed in arbitrary units that must be the same as the 10874 * units used by {@link #computeHorizontalScrollRange()} and 10875 * {@link #computeHorizontalScrollOffset()}.</p> 10876 * 10877 * <p>The default extent is the drawing width of this view.</p> 10878 * 10879 * @return the horizontal extent of the scrollbar's thumb 10880 * 10881 * @see #computeHorizontalScrollRange() 10882 * @see #computeHorizontalScrollOffset() 10883 * @see android.widget.ScrollBarDrawable 10884 */ 10885 protected int computeHorizontalScrollExtent() { 10886 return getWidth(); 10887 } 10888 10889 /** 10890 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10891 * 10892 * <p>The range is expressed in arbitrary units that must be the same as the 10893 * units used by {@link #computeVerticalScrollExtent()} and 10894 * {@link #computeVerticalScrollOffset()}.</p> 10895 * 10896 * @return the total vertical range represented by the vertical scrollbar 10897 * 10898 * <p>The default range is the drawing height of this view.</p> 10899 * 10900 * @see #computeVerticalScrollExtent() 10901 * @see #computeVerticalScrollOffset() 10902 * @see android.widget.ScrollBarDrawable 10903 */ 10904 protected int computeVerticalScrollRange() { 10905 return getHeight(); 10906 } 10907 10908 /** 10909 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10910 * within the horizontal range. This value is used to compute the position 10911 * of the thumb within the scrollbar's track.</p> 10912 * 10913 * <p>The range is expressed in arbitrary units that must be the same as the 10914 * units used by {@link #computeVerticalScrollRange()} and 10915 * {@link #computeVerticalScrollExtent()}.</p> 10916 * 10917 * <p>The default offset is the scroll offset of this view.</p> 10918 * 10919 * @return the vertical offset of the scrollbar's thumb 10920 * 10921 * @see #computeVerticalScrollRange() 10922 * @see #computeVerticalScrollExtent() 10923 * @see android.widget.ScrollBarDrawable 10924 */ 10925 protected int computeVerticalScrollOffset() { 10926 return mScrollY; 10927 } 10928 10929 /** 10930 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10931 * within the vertical range. This value is used to compute the length 10932 * of the thumb within the scrollbar's track.</p> 10933 * 10934 * <p>The range is expressed in arbitrary units that must be the same as the 10935 * units used by {@link #computeVerticalScrollRange()} and 10936 * {@link #computeVerticalScrollOffset()}.</p> 10937 * 10938 * <p>The default extent is the drawing height of this view.</p> 10939 * 10940 * @return the vertical extent of the scrollbar's thumb 10941 * 10942 * @see #computeVerticalScrollRange() 10943 * @see #computeVerticalScrollOffset() 10944 * @see android.widget.ScrollBarDrawable 10945 */ 10946 protected int computeVerticalScrollExtent() { 10947 return getHeight(); 10948 } 10949 10950 /** 10951 * Check if this view can be scrolled horizontally in a certain direction. 10952 * 10953 * @param direction Negative to check scrolling left, positive to check scrolling right. 10954 * @return true if this view can be scrolled in the specified direction, false otherwise. 10955 */ 10956 public boolean canScrollHorizontally(int direction) { 10957 final int offset = computeHorizontalScrollOffset(); 10958 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10959 if (range == 0) return false; 10960 if (direction < 0) { 10961 return offset > 0; 10962 } else { 10963 return offset < range - 1; 10964 } 10965 } 10966 10967 /** 10968 * Check if this view can be scrolled vertically in a certain direction. 10969 * 10970 * @param direction Negative to check scrolling up, positive to check scrolling down. 10971 * @return true if this view can be scrolled in the specified direction, false otherwise. 10972 */ 10973 public boolean canScrollVertically(int direction) { 10974 final int offset = computeVerticalScrollOffset(); 10975 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10976 if (range == 0) return false; 10977 if (direction < 0) { 10978 return offset > 0; 10979 } else { 10980 return offset < range - 1; 10981 } 10982 } 10983 10984 /** 10985 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10986 * scrollbars are painted only if they have been awakened first.</p> 10987 * 10988 * @param canvas the canvas on which to draw the scrollbars 10989 * 10990 * @see #awakenScrollBars(int) 10991 */ 10992 protected final void onDrawScrollBars(Canvas canvas) { 10993 // scrollbars are drawn only when the animation is running 10994 final ScrollabilityCache cache = mScrollCache; 10995 if (cache != null) { 10996 10997 int state = cache.state; 10998 10999 if (state == ScrollabilityCache.OFF) { 11000 return; 11001 } 11002 11003 boolean invalidate = false; 11004 11005 if (state == ScrollabilityCache.FADING) { 11006 // We're fading -- get our fade interpolation 11007 if (cache.interpolatorValues == null) { 11008 cache.interpolatorValues = new float[1]; 11009 } 11010 11011 float[] values = cache.interpolatorValues; 11012 11013 // Stops the animation if we're done 11014 if (cache.scrollBarInterpolator.timeToValues(values) == 11015 Interpolator.Result.FREEZE_END) { 11016 cache.state = ScrollabilityCache.OFF; 11017 } else { 11018 cache.scrollBar.setAlpha(Math.round(values[0])); 11019 } 11020 11021 // This will make the scroll bars inval themselves after 11022 // drawing. We only want this when we're fading so that 11023 // we prevent excessive redraws 11024 invalidate = true; 11025 } else { 11026 // We're just on -- but we may have been fading before so 11027 // reset alpha 11028 cache.scrollBar.setAlpha(255); 11029 } 11030 11031 11032 final int viewFlags = mViewFlags; 11033 11034 final boolean drawHorizontalScrollBar = 11035 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11036 final boolean drawVerticalScrollBar = 11037 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11038 && !isVerticalScrollBarHidden(); 11039 11040 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11041 final int width = mRight - mLeft; 11042 final int height = mBottom - mTop; 11043 11044 final ScrollBarDrawable scrollBar = cache.scrollBar; 11045 11046 final int scrollX = mScrollX; 11047 final int scrollY = mScrollY; 11048 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11049 11050 int left, top, right, bottom; 11051 11052 if (drawHorizontalScrollBar) { 11053 int size = scrollBar.getSize(false); 11054 if (size <= 0) { 11055 size = cache.scrollBarSize; 11056 } 11057 11058 scrollBar.setParameters(computeHorizontalScrollRange(), 11059 computeHorizontalScrollOffset(), 11060 computeHorizontalScrollExtent(), false); 11061 final int verticalScrollBarGap = drawVerticalScrollBar ? 11062 getVerticalScrollbarWidth() : 0; 11063 top = scrollY + height - size - (mUserPaddingBottom & inside); 11064 left = scrollX + (mPaddingLeft & inside); 11065 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11066 bottom = top + size; 11067 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11068 if (invalidate) { 11069 invalidate(left, top, right, bottom); 11070 } 11071 } 11072 11073 if (drawVerticalScrollBar) { 11074 int size = scrollBar.getSize(true); 11075 if (size <= 0) { 11076 size = cache.scrollBarSize; 11077 } 11078 11079 scrollBar.setParameters(computeVerticalScrollRange(), 11080 computeVerticalScrollOffset(), 11081 computeVerticalScrollExtent(), true); 11082 switch (mVerticalScrollbarPosition) { 11083 default: 11084 case SCROLLBAR_POSITION_DEFAULT: 11085 case SCROLLBAR_POSITION_RIGHT: 11086 left = scrollX + width - size - (mUserPaddingRight & inside); 11087 break; 11088 case SCROLLBAR_POSITION_LEFT: 11089 left = scrollX + (mUserPaddingLeft & inside); 11090 break; 11091 } 11092 top = scrollY + (mPaddingTop & inside); 11093 right = left + size; 11094 bottom = scrollY + height - (mUserPaddingBottom & inside); 11095 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11096 if (invalidate) { 11097 invalidate(left, top, right, bottom); 11098 } 11099 } 11100 } 11101 } 11102 } 11103 11104 /** 11105 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11106 * FastScroller is visible. 11107 * @return whether to temporarily hide the vertical scrollbar 11108 * @hide 11109 */ 11110 protected boolean isVerticalScrollBarHidden() { 11111 return false; 11112 } 11113 11114 /** 11115 * <p>Draw the horizontal scrollbar if 11116 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11117 * 11118 * @param canvas the canvas on which to draw the scrollbar 11119 * @param scrollBar the scrollbar's drawable 11120 * 11121 * @see #isHorizontalScrollBarEnabled() 11122 * @see #computeHorizontalScrollRange() 11123 * @see #computeHorizontalScrollExtent() 11124 * @see #computeHorizontalScrollOffset() 11125 * @see android.widget.ScrollBarDrawable 11126 * @hide 11127 */ 11128 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11129 int l, int t, int r, int b) { 11130 scrollBar.setBounds(l, t, r, b); 11131 scrollBar.draw(canvas); 11132 } 11133 11134 /** 11135 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11136 * returns true.</p> 11137 * 11138 * @param canvas the canvas on which to draw the scrollbar 11139 * @param scrollBar the scrollbar's drawable 11140 * 11141 * @see #isVerticalScrollBarEnabled() 11142 * @see #computeVerticalScrollRange() 11143 * @see #computeVerticalScrollExtent() 11144 * @see #computeVerticalScrollOffset() 11145 * @see android.widget.ScrollBarDrawable 11146 * @hide 11147 */ 11148 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11149 int l, int t, int r, int b) { 11150 scrollBar.setBounds(l, t, r, b); 11151 scrollBar.draw(canvas); 11152 } 11153 11154 /** 11155 * Implement this to do your drawing. 11156 * 11157 * @param canvas the canvas on which the background will be drawn 11158 */ 11159 protected void onDraw(Canvas canvas) { 11160 } 11161 11162 /* 11163 * Caller is responsible for calling requestLayout if necessary. 11164 * (This allows addViewInLayout to not request a new layout.) 11165 */ 11166 void assignParent(ViewParent parent) { 11167 if (mParent == null) { 11168 mParent = parent; 11169 } else if (parent == null) { 11170 mParent = null; 11171 } else { 11172 throw new RuntimeException("view " + this + " being added, but" 11173 + " it already has a parent"); 11174 } 11175 } 11176 11177 /** 11178 * This is called when the view is attached to a window. At this point it 11179 * has a Surface and will start drawing. Note that this function is 11180 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11181 * however it may be called any time before the first onDraw -- including 11182 * before or after {@link #onMeasure(int, int)}. 11183 * 11184 * @see #onDetachedFromWindow() 11185 */ 11186 protected void onAttachedToWindow() { 11187 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11188 mParent.requestTransparentRegion(this); 11189 } 11190 11191 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11192 initialAwakenScrollBars(); 11193 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11194 } 11195 11196 jumpDrawablesToCurrentState(); 11197 11198 // Order is important here: LayoutDirection MUST be resolved before Padding 11199 // and TextDirection 11200 resolveLayoutDirection(); 11201 resolvePadding(); 11202 resolveTextDirection(); 11203 resolveTextAlignment(); 11204 11205 clearAccessibilityFocus(); 11206 if (isFocused()) { 11207 InputMethodManager imm = InputMethodManager.peekInstance(); 11208 imm.focusIn(this); 11209 } 11210 11211 if (mAttachInfo != null && mDisplayList != null) { 11212 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11213 } 11214 } 11215 11216 /** 11217 * @see #onScreenStateChanged(int) 11218 */ 11219 void dispatchScreenStateChanged(int screenState) { 11220 onScreenStateChanged(screenState); 11221 } 11222 11223 /** 11224 * This method is called whenever the state of the screen this view is 11225 * attached to changes. A state change will usually occurs when the screen 11226 * turns on or off (whether it happens automatically or the user does it 11227 * manually.) 11228 * 11229 * @param screenState The new state of the screen. Can be either 11230 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11231 */ 11232 public void onScreenStateChanged(int screenState) { 11233 } 11234 11235 /** 11236 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11237 */ 11238 private boolean hasRtlSupport() { 11239 return mContext.getApplicationInfo().hasRtlSupport(); 11240 } 11241 11242 /** 11243 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11244 * that the parent directionality can and will be resolved before its children. 11245 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11246 */ 11247 public void resolveLayoutDirection() { 11248 // Clear any previous layout direction resolution 11249 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11250 11251 if (hasRtlSupport()) { 11252 // Set resolved depending on layout direction 11253 switch (getLayoutDirection()) { 11254 case LAYOUT_DIRECTION_INHERIT: 11255 // If this is root view, no need to look at parent's layout dir. 11256 if (canResolveLayoutDirection()) { 11257 ViewGroup viewGroup = ((ViewGroup) mParent); 11258 11259 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11260 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11261 } 11262 } else { 11263 // Nothing to do, LTR by default 11264 } 11265 break; 11266 case LAYOUT_DIRECTION_RTL: 11267 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11268 break; 11269 case LAYOUT_DIRECTION_LOCALE: 11270 if(isLayoutDirectionRtl(Locale.getDefault())) { 11271 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11272 } 11273 break; 11274 default: 11275 // Nothing to do, LTR by default 11276 } 11277 } 11278 11279 // Set to resolved 11280 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11281 onResolvedLayoutDirectionChanged(); 11282 // Resolve padding 11283 resolvePadding(); 11284 } 11285 11286 /** 11287 * Called when layout direction has been resolved. 11288 * 11289 * The default implementation does nothing. 11290 */ 11291 public void onResolvedLayoutDirectionChanged() { 11292 } 11293 11294 /** 11295 * Resolve padding depending on layout direction. 11296 */ 11297 public void resolvePadding() { 11298 // If the user specified the absolute padding (either with android:padding or 11299 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11300 // use the default padding or the padding from the background drawable 11301 // (stored at this point in mPadding*) 11302 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11303 switch (resolvedLayoutDirection) { 11304 case LAYOUT_DIRECTION_RTL: 11305 // Start user padding override Right user padding. Otherwise, if Right user 11306 // padding is not defined, use the default Right padding. If Right user padding 11307 // is defined, just use it. 11308 if (mUserPaddingStart >= 0) { 11309 mUserPaddingRight = mUserPaddingStart; 11310 } else if (mUserPaddingRight < 0) { 11311 mUserPaddingRight = mPaddingRight; 11312 } 11313 if (mUserPaddingEnd >= 0) { 11314 mUserPaddingLeft = mUserPaddingEnd; 11315 } else if (mUserPaddingLeft < 0) { 11316 mUserPaddingLeft = mPaddingLeft; 11317 } 11318 break; 11319 case LAYOUT_DIRECTION_LTR: 11320 default: 11321 // Start user padding override Left user padding. Otherwise, if Left user 11322 // padding is not defined, use the default left padding. If Left user padding 11323 // is defined, just use it. 11324 if (mUserPaddingStart >= 0) { 11325 mUserPaddingLeft = mUserPaddingStart; 11326 } else if (mUserPaddingLeft < 0) { 11327 mUserPaddingLeft = mPaddingLeft; 11328 } 11329 if (mUserPaddingEnd >= 0) { 11330 mUserPaddingRight = mUserPaddingEnd; 11331 } else if (mUserPaddingRight < 0) { 11332 mUserPaddingRight = mPaddingRight; 11333 } 11334 } 11335 11336 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11337 11338 if(isPaddingRelative()) { 11339 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11340 } else { 11341 recomputePadding(); 11342 } 11343 onPaddingChanged(resolvedLayoutDirection); 11344 } 11345 11346 /** 11347 * Resolve padding depending on the layout direction. Subclasses that care about 11348 * padding resolution should override this method. The default implementation does 11349 * nothing. 11350 * 11351 * @param layoutDirection the direction of the layout 11352 * 11353 * @see {@link #LAYOUT_DIRECTION_LTR} 11354 * @see {@link #LAYOUT_DIRECTION_RTL} 11355 */ 11356 public void onPaddingChanged(int layoutDirection) { 11357 } 11358 11359 /** 11360 * Check if layout direction resolution can be done. 11361 * 11362 * @return true if layout direction resolution can be done otherwise return false. 11363 */ 11364 public boolean canResolveLayoutDirection() { 11365 switch (getLayoutDirection()) { 11366 case LAYOUT_DIRECTION_INHERIT: 11367 return (mParent != null) && (mParent instanceof ViewGroup); 11368 default: 11369 return true; 11370 } 11371 } 11372 11373 /** 11374 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11375 * when reset is done. 11376 */ 11377 public void resetResolvedLayoutDirection() { 11378 // Reset the current resolved bits 11379 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11380 onResolvedLayoutDirectionReset(); 11381 // Reset also the text direction 11382 resetResolvedTextDirection(); 11383 } 11384 11385 /** 11386 * Called during reset of resolved layout direction. 11387 * 11388 * Subclasses need to override this method to clear cached information that depends on the 11389 * resolved layout direction, or to inform child views that inherit their layout direction. 11390 * 11391 * The default implementation does nothing. 11392 */ 11393 public void onResolvedLayoutDirectionReset() { 11394 } 11395 11396 /** 11397 * Check if a Locale uses an RTL script. 11398 * 11399 * @param locale Locale to check 11400 * @return true if the Locale uses an RTL script. 11401 */ 11402 protected static boolean isLayoutDirectionRtl(Locale locale) { 11403 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11404 } 11405 11406 /** 11407 * This is called when the view is detached from a window. At this point it 11408 * no longer has a surface for drawing. 11409 * 11410 * @see #onAttachedToWindow() 11411 */ 11412 protected void onDetachedFromWindow() { 11413 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11414 11415 removeUnsetPressCallback(); 11416 removeLongPressCallback(); 11417 removePerformClickCallback(); 11418 removeSendViewScrolledAccessibilityEventCallback(); 11419 11420 destroyDrawingCache(); 11421 11422 destroyLayer(false); 11423 11424 if (mAttachInfo != null) { 11425 if (mDisplayList != null) { 11426 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11427 } 11428 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11429 } else { 11430 if (mDisplayList != null) { 11431 // Should never happen 11432 mDisplayList.invalidate(); 11433 } 11434 } 11435 11436 mCurrentAnimation = null; 11437 11438 resetResolvedLayoutDirection(); 11439 resetResolvedTextAlignment(); 11440 resetAccessibilityStateChanged(); 11441 } 11442 11443 /** 11444 * @return The number of times this view has been attached to a window 11445 */ 11446 protected int getWindowAttachCount() { 11447 return mWindowAttachCount; 11448 } 11449 11450 /** 11451 * Retrieve a unique token identifying the window this view is attached to. 11452 * @return Return the window's token for use in 11453 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11454 */ 11455 public IBinder getWindowToken() { 11456 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11457 } 11458 11459 /** 11460 * Retrieve a unique token identifying the top-level "real" window of 11461 * the window that this view is attached to. That is, this is like 11462 * {@link #getWindowToken}, except if the window this view in is a panel 11463 * window (attached to another containing window), then the token of 11464 * the containing window is returned instead. 11465 * 11466 * @return Returns the associated window token, either 11467 * {@link #getWindowToken()} or the containing window's token. 11468 */ 11469 public IBinder getApplicationWindowToken() { 11470 AttachInfo ai = mAttachInfo; 11471 if (ai != null) { 11472 IBinder appWindowToken = ai.mPanelParentWindowToken; 11473 if (appWindowToken == null) { 11474 appWindowToken = ai.mWindowToken; 11475 } 11476 return appWindowToken; 11477 } 11478 return null; 11479 } 11480 11481 /** 11482 * Retrieve private session object this view hierarchy is using to 11483 * communicate with the window manager. 11484 * @return the session object to communicate with the window manager 11485 */ 11486 /*package*/ IWindowSession getWindowSession() { 11487 return mAttachInfo != null ? mAttachInfo.mSession : null; 11488 } 11489 11490 /** 11491 * @param info the {@link android.view.View.AttachInfo} to associated with 11492 * this view 11493 */ 11494 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11495 //System.out.println("Attached! " + this); 11496 mAttachInfo = info; 11497 mWindowAttachCount++; 11498 // We will need to evaluate the drawable state at least once. 11499 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11500 if (mFloatingTreeObserver != null) { 11501 info.mTreeObserver.merge(mFloatingTreeObserver); 11502 mFloatingTreeObserver = null; 11503 } 11504 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11505 mAttachInfo.mScrollContainers.add(this); 11506 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11507 } 11508 performCollectViewAttributes(mAttachInfo, visibility); 11509 onAttachedToWindow(); 11510 11511 ListenerInfo li = mListenerInfo; 11512 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11513 li != null ? li.mOnAttachStateChangeListeners : null; 11514 if (listeners != null && listeners.size() > 0) { 11515 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11516 // perform the dispatching. The iterator is a safe guard against listeners that 11517 // could mutate the list by calling the various add/remove methods. This prevents 11518 // the array from being modified while we iterate it. 11519 for (OnAttachStateChangeListener listener : listeners) { 11520 listener.onViewAttachedToWindow(this); 11521 } 11522 } 11523 11524 int vis = info.mWindowVisibility; 11525 if (vis != GONE) { 11526 onWindowVisibilityChanged(vis); 11527 } 11528 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11529 // If nobody has evaluated the drawable state yet, then do it now. 11530 refreshDrawableState(); 11531 } 11532 } 11533 11534 void dispatchDetachedFromWindow() { 11535 AttachInfo info = mAttachInfo; 11536 if (info != null) { 11537 int vis = info.mWindowVisibility; 11538 if (vis != GONE) { 11539 onWindowVisibilityChanged(GONE); 11540 } 11541 } 11542 11543 onDetachedFromWindow(); 11544 11545 ListenerInfo li = mListenerInfo; 11546 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11547 li != null ? li.mOnAttachStateChangeListeners : null; 11548 if (listeners != null && listeners.size() > 0) { 11549 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11550 // perform the dispatching. The iterator is a safe guard against listeners that 11551 // could mutate the list by calling the various add/remove methods. This prevents 11552 // the array from being modified while we iterate it. 11553 for (OnAttachStateChangeListener listener : listeners) { 11554 listener.onViewDetachedFromWindow(this); 11555 } 11556 } 11557 11558 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11559 mAttachInfo.mScrollContainers.remove(this); 11560 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11561 } 11562 11563 mAttachInfo = null; 11564 } 11565 11566 /** 11567 * Store this view hierarchy's frozen state into the given container. 11568 * 11569 * @param container The SparseArray in which to save the view's state. 11570 * 11571 * @see #restoreHierarchyState(android.util.SparseArray) 11572 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11573 * @see #onSaveInstanceState() 11574 */ 11575 public void saveHierarchyState(SparseArray<Parcelable> container) { 11576 dispatchSaveInstanceState(container); 11577 } 11578 11579 /** 11580 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11581 * this view and its children. May be overridden to modify how freezing happens to a 11582 * view's children; for example, some views may want to not store state for their children. 11583 * 11584 * @param container The SparseArray in which to save the view's state. 11585 * 11586 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11587 * @see #saveHierarchyState(android.util.SparseArray) 11588 * @see #onSaveInstanceState() 11589 */ 11590 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11591 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11592 mPrivateFlags &= ~SAVE_STATE_CALLED; 11593 Parcelable state = onSaveInstanceState(); 11594 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11595 throw new IllegalStateException( 11596 "Derived class did not call super.onSaveInstanceState()"); 11597 } 11598 if (state != null) { 11599 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11600 // + ": " + state); 11601 container.put(mID, state); 11602 } 11603 } 11604 } 11605 11606 /** 11607 * Hook allowing a view to generate a representation of its internal state 11608 * that can later be used to create a new instance with that same state. 11609 * This state should only contain information that is not persistent or can 11610 * not be reconstructed later. For example, you will never store your 11611 * current position on screen because that will be computed again when a 11612 * new instance of the view is placed in its view hierarchy. 11613 * <p> 11614 * Some examples of things you may store here: the current cursor position 11615 * in a text view (but usually not the text itself since that is stored in a 11616 * content provider or other persistent storage), the currently selected 11617 * item in a list view. 11618 * 11619 * @return Returns a Parcelable object containing the view's current dynamic 11620 * state, or null if there is nothing interesting to save. The 11621 * default implementation returns null. 11622 * @see #onRestoreInstanceState(android.os.Parcelable) 11623 * @see #saveHierarchyState(android.util.SparseArray) 11624 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11625 * @see #setSaveEnabled(boolean) 11626 */ 11627 protected Parcelable onSaveInstanceState() { 11628 mPrivateFlags |= SAVE_STATE_CALLED; 11629 return BaseSavedState.EMPTY_STATE; 11630 } 11631 11632 /** 11633 * Restore this view hierarchy's frozen state from the given container. 11634 * 11635 * @param container The SparseArray which holds previously frozen states. 11636 * 11637 * @see #saveHierarchyState(android.util.SparseArray) 11638 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11639 * @see #onRestoreInstanceState(android.os.Parcelable) 11640 */ 11641 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11642 dispatchRestoreInstanceState(container); 11643 } 11644 11645 /** 11646 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11647 * state for this view and its children. May be overridden to modify how restoring 11648 * happens to a view's children; for example, some views may want to not store state 11649 * for their children. 11650 * 11651 * @param container The SparseArray which holds previously saved state. 11652 * 11653 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11654 * @see #restoreHierarchyState(android.util.SparseArray) 11655 * @see #onRestoreInstanceState(android.os.Parcelable) 11656 */ 11657 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11658 if (mID != NO_ID) { 11659 Parcelable state = container.get(mID); 11660 if (state != null) { 11661 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11662 // + ": " + state); 11663 mPrivateFlags &= ~SAVE_STATE_CALLED; 11664 onRestoreInstanceState(state); 11665 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11666 throw new IllegalStateException( 11667 "Derived class did not call super.onRestoreInstanceState()"); 11668 } 11669 } 11670 } 11671 } 11672 11673 /** 11674 * Hook allowing a view to re-apply a representation of its internal state that had previously 11675 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11676 * null state. 11677 * 11678 * @param state The frozen state that had previously been returned by 11679 * {@link #onSaveInstanceState}. 11680 * 11681 * @see #onSaveInstanceState() 11682 * @see #restoreHierarchyState(android.util.SparseArray) 11683 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11684 */ 11685 protected void onRestoreInstanceState(Parcelable state) { 11686 mPrivateFlags |= SAVE_STATE_CALLED; 11687 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11688 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11689 + "received " + state.getClass().toString() + " instead. This usually happens " 11690 + "when two views of different type have the same id in the same hierarchy. " 11691 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11692 + "other views do not use the same id."); 11693 } 11694 } 11695 11696 /** 11697 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11698 * 11699 * @return the drawing start time in milliseconds 11700 */ 11701 public long getDrawingTime() { 11702 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11703 } 11704 11705 /** 11706 * <p>Enables or disables the duplication of the parent's state into this view. When 11707 * duplication is enabled, this view gets its drawable state from its parent rather 11708 * than from its own internal properties.</p> 11709 * 11710 * <p>Note: in the current implementation, setting this property to true after the 11711 * view was added to a ViewGroup might have no effect at all. This property should 11712 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11713 * 11714 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11715 * property is enabled, an exception will be thrown.</p> 11716 * 11717 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11718 * parent, these states should not be affected by this method.</p> 11719 * 11720 * @param enabled True to enable duplication of the parent's drawable state, false 11721 * to disable it. 11722 * 11723 * @see #getDrawableState() 11724 * @see #isDuplicateParentStateEnabled() 11725 */ 11726 public void setDuplicateParentStateEnabled(boolean enabled) { 11727 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11728 } 11729 11730 /** 11731 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11732 * 11733 * @return True if this view's drawable state is duplicated from the parent, 11734 * false otherwise 11735 * 11736 * @see #getDrawableState() 11737 * @see #setDuplicateParentStateEnabled(boolean) 11738 */ 11739 public boolean isDuplicateParentStateEnabled() { 11740 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11741 } 11742 11743 /** 11744 * <p>Specifies the type of layer backing this view. The layer can be 11745 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11746 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11747 * 11748 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11749 * instance that controls how the layer is composed on screen. The following 11750 * properties of the paint are taken into account when composing the layer:</p> 11751 * <ul> 11752 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11753 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11754 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11755 * </ul> 11756 * 11757 * <p>If this view has an alpha value set to < 1.0 by calling 11758 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11759 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11760 * equivalent to setting a hardware layer on this view and providing a paint with 11761 * the desired alpha value.<p> 11762 * 11763 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11764 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11765 * for more information on when and how to use layers.</p> 11766 * 11767 * @param layerType The ype of layer to use with this view, must be one of 11768 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11769 * {@link #LAYER_TYPE_HARDWARE} 11770 * @param paint The paint used to compose the layer. This argument is optional 11771 * and can be null. It is ignored when the layer type is 11772 * {@link #LAYER_TYPE_NONE} 11773 * 11774 * @see #getLayerType() 11775 * @see #LAYER_TYPE_NONE 11776 * @see #LAYER_TYPE_SOFTWARE 11777 * @see #LAYER_TYPE_HARDWARE 11778 * @see #setAlpha(float) 11779 * 11780 * @attr ref android.R.styleable#View_layerType 11781 */ 11782 public void setLayerType(int layerType, Paint paint) { 11783 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11784 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11785 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11786 } 11787 11788 if (layerType == mLayerType) { 11789 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11790 mLayerPaint = paint == null ? new Paint() : paint; 11791 invalidateParentCaches(); 11792 invalidate(true); 11793 } 11794 return; 11795 } 11796 11797 // Destroy any previous software drawing cache if needed 11798 switch (mLayerType) { 11799 case LAYER_TYPE_HARDWARE: 11800 destroyLayer(false); 11801 // fall through - non-accelerated views may use software layer mechanism instead 11802 case LAYER_TYPE_SOFTWARE: 11803 destroyDrawingCache(); 11804 break; 11805 default: 11806 break; 11807 } 11808 11809 mLayerType = layerType; 11810 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11811 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11812 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11813 11814 invalidateParentCaches(); 11815 invalidate(true); 11816 } 11817 11818 /** 11819 * Indicates whether this view has a static layer. A view with layer type 11820 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11821 * dynamic. 11822 */ 11823 boolean hasStaticLayer() { 11824 return true; 11825 } 11826 11827 /** 11828 * Indicates what type of layer is currently associated with this view. By default 11829 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11830 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11831 * for more information on the different types of layers. 11832 * 11833 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11834 * {@link #LAYER_TYPE_HARDWARE} 11835 * 11836 * @see #setLayerType(int, android.graphics.Paint) 11837 * @see #buildLayer() 11838 * @see #LAYER_TYPE_NONE 11839 * @see #LAYER_TYPE_SOFTWARE 11840 * @see #LAYER_TYPE_HARDWARE 11841 */ 11842 public int getLayerType() { 11843 return mLayerType; 11844 } 11845 11846 /** 11847 * Forces this view's layer to be created and this view to be rendered 11848 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11849 * invoking this method will have no effect. 11850 * 11851 * This method can for instance be used to render a view into its layer before 11852 * starting an animation. If this view is complex, rendering into the layer 11853 * before starting the animation will avoid skipping frames. 11854 * 11855 * @throws IllegalStateException If this view is not attached to a window 11856 * 11857 * @see #setLayerType(int, android.graphics.Paint) 11858 */ 11859 public void buildLayer() { 11860 if (mLayerType == LAYER_TYPE_NONE) return; 11861 11862 if (mAttachInfo == null) { 11863 throw new IllegalStateException("This view must be attached to a window first"); 11864 } 11865 11866 switch (mLayerType) { 11867 case LAYER_TYPE_HARDWARE: 11868 if (mAttachInfo.mHardwareRenderer != null && 11869 mAttachInfo.mHardwareRenderer.isEnabled() && 11870 mAttachInfo.mHardwareRenderer.validate()) { 11871 getHardwareLayer(); 11872 } 11873 break; 11874 case LAYER_TYPE_SOFTWARE: 11875 buildDrawingCache(true); 11876 break; 11877 } 11878 } 11879 11880 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11881 void flushLayer() { 11882 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11883 mHardwareLayer.flush(); 11884 } 11885 } 11886 11887 /** 11888 * <p>Returns a hardware layer that can be used to draw this view again 11889 * without executing its draw method.</p> 11890 * 11891 * @return A HardwareLayer ready to render, or null if an error occurred. 11892 */ 11893 HardwareLayer getHardwareLayer() { 11894 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11895 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11896 return null; 11897 } 11898 11899 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11900 11901 final int width = mRight - mLeft; 11902 final int height = mBottom - mTop; 11903 11904 if (width == 0 || height == 0) { 11905 return null; 11906 } 11907 11908 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11909 if (mHardwareLayer == null) { 11910 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11911 width, height, isOpaque()); 11912 mLocalDirtyRect.set(0, 0, width, height); 11913 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11914 mHardwareLayer.resize(width, height); 11915 mLocalDirtyRect.set(0, 0, width, height); 11916 } 11917 11918 // The layer is not valid if the underlying GPU resources cannot be allocated 11919 if (!mHardwareLayer.isValid()) { 11920 return null; 11921 } 11922 11923 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11924 mLocalDirtyRect.setEmpty(); 11925 } 11926 11927 return mHardwareLayer; 11928 } 11929 11930 /** 11931 * Destroys this View's hardware layer if possible. 11932 * 11933 * @return True if the layer was destroyed, false otherwise. 11934 * 11935 * @see #setLayerType(int, android.graphics.Paint) 11936 * @see #LAYER_TYPE_HARDWARE 11937 */ 11938 boolean destroyLayer(boolean valid) { 11939 if (mHardwareLayer != null) { 11940 AttachInfo info = mAttachInfo; 11941 if (info != null && info.mHardwareRenderer != null && 11942 info.mHardwareRenderer.isEnabled() && 11943 (valid || info.mHardwareRenderer.validate())) { 11944 mHardwareLayer.destroy(); 11945 mHardwareLayer = null; 11946 11947 invalidate(true); 11948 invalidateParentCaches(); 11949 } 11950 return true; 11951 } 11952 return false; 11953 } 11954 11955 /** 11956 * Destroys all hardware rendering resources. This method is invoked 11957 * when the system needs to reclaim resources. Upon execution of this 11958 * method, you should free any OpenGL resources created by the view. 11959 * 11960 * Note: you <strong>must</strong> call 11961 * <code>super.destroyHardwareResources()</code> when overriding 11962 * this method. 11963 * 11964 * @hide 11965 */ 11966 protected void destroyHardwareResources() { 11967 destroyLayer(true); 11968 } 11969 11970 /** 11971 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11972 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11973 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11974 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11975 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11976 * null.</p> 11977 * 11978 * <p>Enabling the drawing cache is similar to 11979 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11980 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11981 * drawing cache has no effect on rendering because the system uses a different mechanism 11982 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11983 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11984 * for information on how to enable software and hardware layers.</p> 11985 * 11986 * <p>This API can be used to manually generate 11987 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11988 * {@link #getDrawingCache()}.</p> 11989 * 11990 * @param enabled true to enable the drawing cache, false otherwise 11991 * 11992 * @see #isDrawingCacheEnabled() 11993 * @see #getDrawingCache() 11994 * @see #buildDrawingCache() 11995 * @see #setLayerType(int, android.graphics.Paint) 11996 */ 11997 public void setDrawingCacheEnabled(boolean enabled) { 11998 mCachingFailed = false; 11999 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12000 } 12001 12002 /** 12003 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12004 * 12005 * @return true if the drawing cache is enabled 12006 * 12007 * @see #setDrawingCacheEnabled(boolean) 12008 * @see #getDrawingCache() 12009 */ 12010 @ViewDebug.ExportedProperty(category = "drawing") 12011 public boolean isDrawingCacheEnabled() { 12012 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12013 } 12014 12015 /** 12016 * Debugging utility which recursively outputs the dirty state of a view and its 12017 * descendants. 12018 * 12019 * @hide 12020 */ 12021 @SuppressWarnings({"UnusedDeclaration"}) 12022 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12023 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12024 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12025 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12026 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12027 if (clear) { 12028 mPrivateFlags &= clearMask; 12029 } 12030 if (this instanceof ViewGroup) { 12031 ViewGroup parent = (ViewGroup) this; 12032 final int count = parent.getChildCount(); 12033 for (int i = 0; i < count; i++) { 12034 final View child = parent.getChildAt(i); 12035 child.outputDirtyFlags(indent + " ", clear, clearMask); 12036 } 12037 } 12038 } 12039 12040 /** 12041 * This method is used by ViewGroup to cause its children to restore or recreate their 12042 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12043 * to recreate its own display list, which would happen if it went through the normal 12044 * draw/dispatchDraw mechanisms. 12045 * 12046 * @hide 12047 */ 12048 protected void dispatchGetDisplayList() {} 12049 12050 /** 12051 * A view that is not attached or hardware accelerated cannot create a display list. 12052 * This method checks these conditions and returns the appropriate result. 12053 * 12054 * @return true if view has the ability to create a display list, false otherwise. 12055 * 12056 * @hide 12057 */ 12058 public boolean canHaveDisplayList() { 12059 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12060 } 12061 12062 /** 12063 * @return The HardwareRenderer associated with that view or null if hardware rendering 12064 * is not supported or this this has not been attached to a window. 12065 * 12066 * @hide 12067 */ 12068 public HardwareRenderer getHardwareRenderer() { 12069 if (mAttachInfo != null) { 12070 return mAttachInfo.mHardwareRenderer; 12071 } 12072 return null; 12073 } 12074 12075 /** 12076 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12077 * Otherwise, the same display list will be returned (after having been rendered into 12078 * along the way, depending on the invalidation state of the view). 12079 * 12080 * @param displayList The previous version of this displayList, could be null. 12081 * @param isLayer Whether the requester of the display list is a layer. If so, 12082 * the view will avoid creating a layer inside the resulting display list. 12083 * @return A new or reused DisplayList object. 12084 */ 12085 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12086 if (!canHaveDisplayList()) { 12087 return null; 12088 } 12089 12090 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12091 displayList == null || !displayList.isValid() || 12092 (!isLayer && mRecreateDisplayList))) { 12093 // Don't need to recreate the display list, just need to tell our 12094 // children to restore/recreate theirs 12095 if (displayList != null && displayList.isValid() && 12096 !isLayer && !mRecreateDisplayList) { 12097 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12098 mPrivateFlags &= ~DIRTY_MASK; 12099 dispatchGetDisplayList(); 12100 12101 return displayList; 12102 } 12103 12104 if (!isLayer) { 12105 // If we got here, we're recreating it. Mark it as such to ensure that 12106 // we copy in child display lists into ours in drawChild() 12107 mRecreateDisplayList = true; 12108 } 12109 if (displayList == null) { 12110 final String name = getClass().getSimpleName(); 12111 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12112 // If we're creating a new display list, make sure our parent gets invalidated 12113 // since they will need to recreate their display list to account for this 12114 // new child display list. 12115 invalidateParentCaches(); 12116 } 12117 12118 boolean caching = false; 12119 final HardwareCanvas canvas = displayList.start(); 12120 int width = mRight - mLeft; 12121 int height = mBottom - mTop; 12122 12123 try { 12124 canvas.setViewport(width, height); 12125 // The dirty rect should always be null for a display list 12126 canvas.onPreDraw(null); 12127 int layerType = ( 12128 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12129 getLayerType() : LAYER_TYPE_NONE; 12130 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12131 if (layerType == LAYER_TYPE_HARDWARE) { 12132 final HardwareLayer layer = getHardwareLayer(); 12133 if (layer != null && layer.isValid()) { 12134 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12135 } else { 12136 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12137 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12138 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12139 } 12140 caching = true; 12141 } else { 12142 buildDrawingCache(true); 12143 Bitmap cache = getDrawingCache(true); 12144 if (cache != null) { 12145 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12146 caching = true; 12147 } 12148 } 12149 } else { 12150 12151 computeScroll(); 12152 12153 canvas.translate(-mScrollX, -mScrollY); 12154 if (!isLayer) { 12155 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12156 mPrivateFlags &= ~DIRTY_MASK; 12157 } 12158 12159 // Fast path for layouts with no backgrounds 12160 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12161 dispatchDraw(canvas); 12162 } else { 12163 draw(canvas); 12164 } 12165 } 12166 } finally { 12167 canvas.onPostDraw(); 12168 12169 displayList.end(); 12170 displayList.setCaching(caching); 12171 if (isLayer) { 12172 displayList.setLeftTopRightBottom(0, 0, width, height); 12173 } else { 12174 setDisplayListProperties(displayList); 12175 } 12176 } 12177 } else if (!isLayer) { 12178 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12179 mPrivateFlags &= ~DIRTY_MASK; 12180 } 12181 12182 return displayList; 12183 } 12184 12185 /** 12186 * Get the DisplayList for the HardwareLayer 12187 * 12188 * @param layer The HardwareLayer whose DisplayList we want 12189 * @return A DisplayList fopr the specified HardwareLayer 12190 */ 12191 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12192 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12193 layer.setDisplayList(displayList); 12194 return displayList; 12195 } 12196 12197 12198 /** 12199 * <p>Returns a display list that can be used to draw this view again 12200 * without executing its draw method.</p> 12201 * 12202 * @return A DisplayList ready to replay, or null if caching is not enabled. 12203 * 12204 * @hide 12205 */ 12206 public DisplayList getDisplayList() { 12207 mDisplayList = getDisplayList(mDisplayList, false); 12208 return mDisplayList; 12209 } 12210 12211 /** 12212 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12213 * 12214 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12215 * 12216 * @see #getDrawingCache(boolean) 12217 */ 12218 public Bitmap getDrawingCache() { 12219 return getDrawingCache(false); 12220 } 12221 12222 /** 12223 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12224 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12225 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12226 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12227 * request the drawing cache by calling this method and draw it on screen if the 12228 * returned bitmap is not null.</p> 12229 * 12230 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12231 * this method will create a bitmap of the same size as this view. Because this bitmap 12232 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12233 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12234 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12235 * size than the view. This implies that your application must be able to handle this 12236 * size.</p> 12237 * 12238 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12239 * the current density of the screen when the application is in compatibility 12240 * mode. 12241 * 12242 * @return A bitmap representing this view or null if cache is disabled. 12243 * 12244 * @see #setDrawingCacheEnabled(boolean) 12245 * @see #isDrawingCacheEnabled() 12246 * @see #buildDrawingCache(boolean) 12247 * @see #destroyDrawingCache() 12248 */ 12249 public Bitmap getDrawingCache(boolean autoScale) { 12250 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12251 return null; 12252 } 12253 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12254 buildDrawingCache(autoScale); 12255 } 12256 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12257 } 12258 12259 /** 12260 * <p>Frees the resources used by the drawing cache. If you call 12261 * {@link #buildDrawingCache()} manually without calling 12262 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12263 * should cleanup the cache with this method afterwards.</p> 12264 * 12265 * @see #setDrawingCacheEnabled(boolean) 12266 * @see #buildDrawingCache() 12267 * @see #getDrawingCache() 12268 */ 12269 public void destroyDrawingCache() { 12270 if (mDrawingCache != null) { 12271 mDrawingCache.recycle(); 12272 mDrawingCache = null; 12273 } 12274 if (mUnscaledDrawingCache != null) { 12275 mUnscaledDrawingCache.recycle(); 12276 mUnscaledDrawingCache = null; 12277 } 12278 } 12279 12280 /** 12281 * Setting a solid background color for the drawing cache's bitmaps will improve 12282 * performance and memory usage. Note, though that this should only be used if this 12283 * view will always be drawn on top of a solid color. 12284 * 12285 * @param color The background color to use for the drawing cache's bitmap 12286 * 12287 * @see #setDrawingCacheEnabled(boolean) 12288 * @see #buildDrawingCache() 12289 * @see #getDrawingCache() 12290 */ 12291 public void setDrawingCacheBackgroundColor(int color) { 12292 if (color != mDrawingCacheBackgroundColor) { 12293 mDrawingCacheBackgroundColor = color; 12294 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12295 } 12296 } 12297 12298 /** 12299 * @see #setDrawingCacheBackgroundColor(int) 12300 * 12301 * @return The background color to used for the drawing cache's bitmap 12302 */ 12303 public int getDrawingCacheBackgroundColor() { 12304 return mDrawingCacheBackgroundColor; 12305 } 12306 12307 /** 12308 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12309 * 12310 * @see #buildDrawingCache(boolean) 12311 */ 12312 public void buildDrawingCache() { 12313 buildDrawingCache(false); 12314 } 12315 12316 /** 12317 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12318 * 12319 * <p>If you call {@link #buildDrawingCache()} manually without calling 12320 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12321 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12322 * 12323 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12324 * this method will create a bitmap of the same size as this view. Because this bitmap 12325 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12326 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12327 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12328 * size than the view. This implies that your application must be able to handle this 12329 * size.</p> 12330 * 12331 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12332 * you do not need the drawing cache bitmap, calling this method will increase memory 12333 * usage and cause the view to be rendered in software once, thus negatively impacting 12334 * performance.</p> 12335 * 12336 * @see #getDrawingCache() 12337 * @see #destroyDrawingCache() 12338 */ 12339 public void buildDrawingCache(boolean autoScale) { 12340 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12341 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12342 mCachingFailed = false; 12343 12344 int width = mRight - mLeft; 12345 int height = mBottom - mTop; 12346 12347 final AttachInfo attachInfo = mAttachInfo; 12348 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12349 12350 if (autoScale && scalingRequired) { 12351 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12352 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12353 } 12354 12355 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12356 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12357 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12358 12359 if (width <= 0 || height <= 0 || 12360 // Projected bitmap size in bytes 12361 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12362 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12363 destroyDrawingCache(); 12364 mCachingFailed = true; 12365 return; 12366 } 12367 12368 boolean clear = true; 12369 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12370 12371 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12372 Bitmap.Config quality; 12373 if (!opaque) { 12374 // Never pick ARGB_4444 because it looks awful 12375 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12376 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12377 case DRAWING_CACHE_QUALITY_AUTO: 12378 quality = Bitmap.Config.ARGB_8888; 12379 break; 12380 case DRAWING_CACHE_QUALITY_LOW: 12381 quality = Bitmap.Config.ARGB_8888; 12382 break; 12383 case DRAWING_CACHE_QUALITY_HIGH: 12384 quality = Bitmap.Config.ARGB_8888; 12385 break; 12386 default: 12387 quality = Bitmap.Config.ARGB_8888; 12388 break; 12389 } 12390 } else { 12391 // Optimization for translucent windows 12392 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12393 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12394 } 12395 12396 // Try to cleanup memory 12397 if (bitmap != null) bitmap.recycle(); 12398 12399 try { 12400 bitmap = Bitmap.createBitmap(width, height, quality); 12401 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12402 if (autoScale) { 12403 mDrawingCache = bitmap; 12404 } else { 12405 mUnscaledDrawingCache = bitmap; 12406 } 12407 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12408 } catch (OutOfMemoryError e) { 12409 // If there is not enough memory to create the bitmap cache, just 12410 // ignore the issue as bitmap caches are not required to draw the 12411 // view hierarchy 12412 if (autoScale) { 12413 mDrawingCache = null; 12414 } else { 12415 mUnscaledDrawingCache = null; 12416 } 12417 mCachingFailed = true; 12418 return; 12419 } 12420 12421 clear = drawingCacheBackgroundColor != 0; 12422 } 12423 12424 Canvas canvas; 12425 if (attachInfo != null) { 12426 canvas = attachInfo.mCanvas; 12427 if (canvas == null) { 12428 canvas = new Canvas(); 12429 } 12430 canvas.setBitmap(bitmap); 12431 // Temporarily clobber the cached Canvas in case one of our children 12432 // is also using a drawing cache. Without this, the children would 12433 // steal the canvas by attaching their own bitmap to it and bad, bad 12434 // thing would happen (invisible views, corrupted drawings, etc.) 12435 attachInfo.mCanvas = null; 12436 } else { 12437 // This case should hopefully never or seldom happen 12438 canvas = new Canvas(bitmap); 12439 } 12440 12441 if (clear) { 12442 bitmap.eraseColor(drawingCacheBackgroundColor); 12443 } 12444 12445 computeScroll(); 12446 final int restoreCount = canvas.save(); 12447 12448 if (autoScale && scalingRequired) { 12449 final float scale = attachInfo.mApplicationScale; 12450 canvas.scale(scale, scale); 12451 } 12452 12453 canvas.translate(-mScrollX, -mScrollY); 12454 12455 mPrivateFlags |= DRAWN; 12456 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12457 mLayerType != LAYER_TYPE_NONE) { 12458 mPrivateFlags |= DRAWING_CACHE_VALID; 12459 } 12460 12461 // Fast path for layouts with no backgrounds 12462 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12463 mPrivateFlags &= ~DIRTY_MASK; 12464 dispatchDraw(canvas); 12465 } else { 12466 draw(canvas); 12467 } 12468 12469 canvas.restoreToCount(restoreCount); 12470 canvas.setBitmap(null); 12471 12472 if (attachInfo != null) { 12473 // Restore the cached Canvas for our siblings 12474 attachInfo.mCanvas = canvas; 12475 } 12476 } 12477 } 12478 12479 /** 12480 * Create a snapshot of the view into a bitmap. We should probably make 12481 * some form of this public, but should think about the API. 12482 */ 12483 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12484 int width = mRight - mLeft; 12485 int height = mBottom - mTop; 12486 12487 final AttachInfo attachInfo = mAttachInfo; 12488 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12489 width = (int) ((width * scale) + 0.5f); 12490 height = (int) ((height * scale) + 0.5f); 12491 12492 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12493 if (bitmap == null) { 12494 throw new OutOfMemoryError(); 12495 } 12496 12497 Resources resources = getResources(); 12498 if (resources != null) { 12499 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12500 } 12501 12502 Canvas canvas; 12503 if (attachInfo != null) { 12504 canvas = attachInfo.mCanvas; 12505 if (canvas == null) { 12506 canvas = new Canvas(); 12507 } 12508 canvas.setBitmap(bitmap); 12509 // Temporarily clobber the cached Canvas in case one of our children 12510 // is also using a drawing cache. Without this, the children would 12511 // steal the canvas by attaching their own bitmap to it and bad, bad 12512 // things would happen (invisible views, corrupted drawings, etc.) 12513 attachInfo.mCanvas = null; 12514 } else { 12515 // This case should hopefully never or seldom happen 12516 canvas = new Canvas(bitmap); 12517 } 12518 12519 if ((backgroundColor & 0xff000000) != 0) { 12520 bitmap.eraseColor(backgroundColor); 12521 } 12522 12523 computeScroll(); 12524 final int restoreCount = canvas.save(); 12525 canvas.scale(scale, scale); 12526 canvas.translate(-mScrollX, -mScrollY); 12527 12528 // Temporarily remove the dirty mask 12529 int flags = mPrivateFlags; 12530 mPrivateFlags &= ~DIRTY_MASK; 12531 12532 // Fast path for layouts with no backgrounds 12533 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12534 dispatchDraw(canvas); 12535 } else { 12536 draw(canvas); 12537 } 12538 12539 mPrivateFlags = flags; 12540 12541 canvas.restoreToCount(restoreCount); 12542 canvas.setBitmap(null); 12543 12544 if (attachInfo != null) { 12545 // Restore the cached Canvas for our siblings 12546 attachInfo.mCanvas = canvas; 12547 } 12548 12549 return bitmap; 12550 } 12551 12552 /** 12553 * Indicates whether this View is currently in edit mode. A View is usually 12554 * in edit mode when displayed within a developer tool. For instance, if 12555 * this View is being drawn by a visual user interface builder, this method 12556 * should return true. 12557 * 12558 * Subclasses should check the return value of this method to provide 12559 * different behaviors if their normal behavior might interfere with the 12560 * host environment. For instance: the class spawns a thread in its 12561 * constructor, the drawing code relies on device-specific features, etc. 12562 * 12563 * This method is usually checked in the drawing code of custom widgets. 12564 * 12565 * @return True if this View is in edit mode, false otherwise. 12566 */ 12567 public boolean isInEditMode() { 12568 return false; 12569 } 12570 12571 /** 12572 * If the View draws content inside its padding and enables fading edges, 12573 * it needs to support padding offsets. Padding offsets are added to the 12574 * fading edges to extend the length of the fade so that it covers pixels 12575 * drawn inside the padding. 12576 * 12577 * Subclasses of this class should override this method if they need 12578 * to draw content inside the padding. 12579 * 12580 * @return True if padding offset must be applied, false otherwise. 12581 * 12582 * @see #getLeftPaddingOffset() 12583 * @see #getRightPaddingOffset() 12584 * @see #getTopPaddingOffset() 12585 * @see #getBottomPaddingOffset() 12586 * 12587 * @since CURRENT 12588 */ 12589 protected boolean isPaddingOffsetRequired() { 12590 return false; 12591 } 12592 12593 /** 12594 * Amount by which to extend the left fading region. Called only when 12595 * {@link #isPaddingOffsetRequired()} returns true. 12596 * 12597 * @return The left padding offset in pixels. 12598 * 12599 * @see #isPaddingOffsetRequired() 12600 * 12601 * @since CURRENT 12602 */ 12603 protected int getLeftPaddingOffset() { 12604 return 0; 12605 } 12606 12607 /** 12608 * Amount by which to extend the right fading region. Called only when 12609 * {@link #isPaddingOffsetRequired()} returns true. 12610 * 12611 * @return The right padding offset in pixels. 12612 * 12613 * @see #isPaddingOffsetRequired() 12614 * 12615 * @since CURRENT 12616 */ 12617 protected int getRightPaddingOffset() { 12618 return 0; 12619 } 12620 12621 /** 12622 * Amount by which to extend the top fading region. Called only when 12623 * {@link #isPaddingOffsetRequired()} returns true. 12624 * 12625 * @return The top padding offset in pixels. 12626 * 12627 * @see #isPaddingOffsetRequired() 12628 * 12629 * @since CURRENT 12630 */ 12631 protected int getTopPaddingOffset() { 12632 return 0; 12633 } 12634 12635 /** 12636 * Amount by which to extend the bottom fading region. Called only when 12637 * {@link #isPaddingOffsetRequired()} returns true. 12638 * 12639 * @return The bottom padding offset in pixels. 12640 * 12641 * @see #isPaddingOffsetRequired() 12642 * 12643 * @since CURRENT 12644 */ 12645 protected int getBottomPaddingOffset() { 12646 return 0; 12647 } 12648 12649 /** 12650 * @hide 12651 * @param offsetRequired 12652 */ 12653 protected int getFadeTop(boolean offsetRequired) { 12654 int top = mPaddingTop; 12655 if (offsetRequired) top += getTopPaddingOffset(); 12656 return top; 12657 } 12658 12659 /** 12660 * @hide 12661 * @param offsetRequired 12662 */ 12663 protected int getFadeHeight(boolean offsetRequired) { 12664 int padding = mPaddingTop; 12665 if (offsetRequired) padding += getTopPaddingOffset(); 12666 return mBottom - mTop - mPaddingBottom - padding; 12667 } 12668 12669 /** 12670 * <p>Indicates whether this view is attached to a hardware accelerated 12671 * window or not.</p> 12672 * 12673 * <p>Even if this method returns true, it does not mean that every call 12674 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12675 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12676 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12677 * window is hardware accelerated, 12678 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12679 * return false, and this method will return true.</p> 12680 * 12681 * @return True if the view is attached to a window and the window is 12682 * hardware accelerated; false in any other case. 12683 */ 12684 public boolean isHardwareAccelerated() { 12685 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12686 } 12687 12688 /** 12689 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12690 * case of an active Animation being run on the view. 12691 */ 12692 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12693 Animation a, boolean scalingRequired) { 12694 Transformation invalidationTransform; 12695 final int flags = parent.mGroupFlags; 12696 final boolean initialized = a.isInitialized(); 12697 if (!initialized) { 12698 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12699 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12700 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 12701 onAnimationStart(); 12702 } 12703 12704 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12705 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12706 if (parent.mInvalidationTransformation == null) { 12707 parent.mInvalidationTransformation = new Transformation(); 12708 } 12709 invalidationTransform = parent.mInvalidationTransformation; 12710 a.getTransformation(drawingTime, invalidationTransform, 1f); 12711 } else { 12712 invalidationTransform = parent.mChildTransformation; 12713 } 12714 12715 if (more) { 12716 if (!a.willChangeBounds()) { 12717 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12718 parent.FLAG_OPTIMIZE_INVALIDATE) { 12719 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12720 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12721 // The child need to draw an animation, potentially offscreen, so 12722 // make sure we do not cancel invalidate requests 12723 parent.mPrivateFlags |= DRAW_ANIMATION; 12724 parent.invalidate(mLeft, mTop, mRight, mBottom); 12725 } 12726 } else { 12727 if (parent.mInvalidateRegion == null) { 12728 parent.mInvalidateRegion = new RectF(); 12729 } 12730 final RectF region = parent.mInvalidateRegion; 12731 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12732 invalidationTransform); 12733 12734 // The child need to draw an animation, potentially offscreen, so 12735 // make sure we do not cancel invalidate requests 12736 parent.mPrivateFlags |= DRAW_ANIMATION; 12737 12738 final int left = mLeft + (int) region.left; 12739 final int top = mTop + (int) region.top; 12740 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12741 top + (int) (region.height() + .5f)); 12742 } 12743 } 12744 return more; 12745 } 12746 12747 /** 12748 * This method is called by getDisplayList() when a display list is created or re-rendered. 12749 * It sets or resets the current value of all properties on that display list (resetting is 12750 * necessary when a display list is being re-created, because we need to make sure that 12751 * previously-set transform values 12752 */ 12753 void setDisplayListProperties(DisplayList displayList) { 12754 if (displayList != null) { 12755 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12756 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12757 if (mParent instanceof ViewGroup) { 12758 displayList.setClipChildren( 12759 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12760 } 12761 float alpha = 1; 12762 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12763 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12764 ViewGroup parentVG = (ViewGroup) mParent; 12765 final boolean hasTransform = 12766 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12767 if (hasTransform) { 12768 Transformation transform = parentVG.mChildTransformation; 12769 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12770 if (transformType != Transformation.TYPE_IDENTITY) { 12771 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12772 alpha = transform.getAlpha(); 12773 } 12774 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12775 displayList.setStaticMatrix(transform.getMatrix()); 12776 } 12777 } 12778 } 12779 } 12780 if (mTransformationInfo != null) { 12781 alpha *= mTransformationInfo.mAlpha; 12782 if (alpha < 1) { 12783 final int multipliedAlpha = (int) (255 * alpha); 12784 if (onSetAlpha(multipliedAlpha)) { 12785 alpha = 1; 12786 } 12787 } 12788 displayList.setTransformationInfo(alpha, 12789 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12790 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12791 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12792 mTransformationInfo.mScaleY); 12793 if (mTransformationInfo.mCamera == null) { 12794 mTransformationInfo.mCamera = new Camera(); 12795 mTransformationInfo.matrix3D = new Matrix(); 12796 } 12797 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12798 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12799 displayList.setPivotX(getPivotX()); 12800 displayList.setPivotY(getPivotY()); 12801 } 12802 } else if (alpha < 1) { 12803 displayList.setAlpha(alpha); 12804 } 12805 } 12806 } 12807 12808 /** 12809 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12810 * This draw() method is an implementation detail and is not intended to be overridden or 12811 * to be called from anywhere else other than ViewGroup.drawChild(). 12812 */ 12813 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12814 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12815 boolean more = false; 12816 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12817 final int flags = parent.mGroupFlags; 12818 12819 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12820 parent.mChildTransformation.clear(); 12821 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12822 } 12823 12824 Transformation transformToApply = null; 12825 boolean concatMatrix = false; 12826 12827 boolean scalingRequired = false; 12828 boolean caching; 12829 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12830 12831 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12832 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12833 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12834 caching = true; 12835 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12836 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12837 } else { 12838 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12839 } 12840 12841 final Animation a = getAnimation(); 12842 if (a != null) { 12843 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12844 concatMatrix = a.willChangeTransformationMatrix(); 12845 if (concatMatrix) { 12846 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12847 } 12848 transformToApply = parent.mChildTransformation; 12849 } else { 12850 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12851 mDisplayList != null) { 12852 // No longer animating: clear out old animation matrix 12853 mDisplayList.setAnimationMatrix(null); 12854 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12855 } 12856 if (!useDisplayListProperties && 12857 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12858 final boolean hasTransform = 12859 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12860 if (hasTransform) { 12861 final int transformType = parent.mChildTransformation.getTransformationType(); 12862 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12863 parent.mChildTransformation : null; 12864 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12865 } 12866 } 12867 } 12868 12869 concatMatrix |= !childHasIdentityMatrix; 12870 12871 // Sets the flag as early as possible to allow draw() implementations 12872 // to call invalidate() successfully when doing animations 12873 mPrivateFlags |= DRAWN; 12874 12875 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12876 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12877 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12878 return more; 12879 } 12880 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12881 12882 if (hardwareAccelerated) { 12883 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12884 // retain the flag's value temporarily in the mRecreateDisplayList flag 12885 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12886 mPrivateFlags &= ~INVALIDATED; 12887 } 12888 12889 computeScroll(); 12890 12891 final int sx = mScrollX; 12892 final int sy = mScrollY; 12893 12894 DisplayList displayList = null; 12895 Bitmap cache = null; 12896 boolean hasDisplayList = false; 12897 if (caching) { 12898 if (!hardwareAccelerated) { 12899 if (layerType != LAYER_TYPE_NONE) { 12900 layerType = LAYER_TYPE_SOFTWARE; 12901 buildDrawingCache(true); 12902 } 12903 cache = getDrawingCache(true); 12904 } else { 12905 switch (layerType) { 12906 case LAYER_TYPE_SOFTWARE: 12907 if (useDisplayListProperties) { 12908 hasDisplayList = canHaveDisplayList(); 12909 } else { 12910 buildDrawingCache(true); 12911 cache = getDrawingCache(true); 12912 } 12913 break; 12914 case LAYER_TYPE_HARDWARE: 12915 if (useDisplayListProperties) { 12916 hasDisplayList = canHaveDisplayList(); 12917 } 12918 break; 12919 case LAYER_TYPE_NONE: 12920 // Delay getting the display list until animation-driven alpha values are 12921 // set up and possibly passed on to the view 12922 hasDisplayList = canHaveDisplayList(); 12923 break; 12924 } 12925 } 12926 } 12927 useDisplayListProperties &= hasDisplayList; 12928 if (useDisplayListProperties) { 12929 displayList = getDisplayList(); 12930 if (!displayList.isValid()) { 12931 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12932 // to getDisplayList(), the display list will be marked invalid and we should not 12933 // try to use it again. 12934 displayList = null; 12935 hasDisplayList = false; 12936 useDisplayListProperties = false; 12937 } 12938 } 12939 12940 final boolean hasNoCache = cache == null || hasDisplayList; 12941 final boolean offsetForScroll = cache == null && !hasDisplayList && 12942 layerType != LAYER_TYPE_HARDWARE; 12943 12944 int restoreTo = -1; 12945 if (!useDisplayListProperties || transformToApply != null) { 12946 restoreTo = canvas.save(); 12947 } 12948 if (offsetForScroll) { 12949 canvas.translate(mLeft - sx, mTop - sy); 12950 } else { 12951 if (!useDisplayListProperties) { 12952 canvas.translate(mLeft, mTop); 12953 } 12954 if (scalingRequired) { 12955 if (useDisplayListProperties) { 12956 // TODO: Might not need this if we put everything inside the DL 12957 restoreTo = canvas.save(); 12958 } 12959 // mAttachInfo cannot be null, otherwise scalingRequired == false 12960 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12961 canvas.scale(scale, scale); 12962 } 12963 } 12964 12965 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12966 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12967 if (transformToApply != null || !childHasIdentityMatrix) { 12968 int transX = 0; 12969 int transY = 0; 12970 12971 if (offsetForScroll) { 12972 transX = -sx; 12973 transY = -sy; 12974 } 12975 12976 if (transformToApply != null) { 12977 if (concatMatrix) { 12978 if (useDisplayListProperties) { 12979 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12980 } else { 12981 // Undo the scroll translation, apply the transformation matrix, 12982 // then redo the scroll translate to get the correct result. 12983 canvas.translate(-transX, -transY); 12984 canvas.concat(transformToApply.getMatrix()); 12985 canvas.translate(transX, transY); 12986 } 12987 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12988 } 12989 12990 float transformAlpha = transformToApply.getAlpha(); 12991 if (transformAlpha < 1) { 12992 alpha *= transformToApply.getAlpha(); 12993 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12994 } 12995 } 12996 12997 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12998 canvas.translate(-transX, -transY); 12999 canvas.concat(getMatrix()); 13000 canvas.translate(transX, transY); 13001 } 13002 } 13003 13004 if (alpha < 1) { 13005 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13006 if (hasNoCache) { 13007 final int multipliedAlpha = (int) (255 * alpha); 13008 if (!onSetAlpha(multipliedAlpha)) { 13009 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13010 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13011 layerType != LAYER_TYPE_NONE) { 13012 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13013 } 13014 if (useDisplayListProperties) { 13015 displayList.setAlpha(alpha * getAlpha()); 13016 } else if (layerType == LAYER_TYPE_NONE) { 13017 final int scrollX = hasDisplayList ? 0 : sx; 13018 final int scrollY = hasDisplayList ? 0 : sy; 13019 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13020 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13021 } 13022 } else { 13023 // Alpha is handled by the child directly, clobber the layer's alpha 13024 mPrivateFlags |= ALPHA_SET; 13025 } 13026 } 13027 } 13028 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13029 onSetAlpha(255); 13030 mPrivateFlags &= ~ALPHA_SET; 13031 } 13032 13033 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13034 !useDisplayListProperties) { 13035 if (offsetForScroll) { 13036 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13037 } else { 13038 if (!scalingRequired || cache == null) { 13039 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13040 } else { 13041 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13042 } 13043 } 13044 } 13045 13046 if (!useDisplayListProperties && hasDisplayList) { 13047 displayList = getDisplayList(); 13048 if (!displayList.isValid()) { 13049 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13050 // to getDisplayList(), the display list will be marked invalid and we should not 13051 // try to use it again. 13052 displayList = null; 13053 hasDisplayList = false; 13054 } 13055 } 13056 13057 if (hasNoCache) { 13058 boolean layerRendered = false; 13059 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13060 final HardwareLayer layer = getHardwareLayer(); 13061 if (layer != null && layer.isValid()) { 13062 mLayerPaint.setAlpha((int) (alpha * 255)); 13063 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13064 layerRendered = true; 13065 } else { 13066 final int scrollX = hasDisplayList ? 0 : sx; 13067 final int scrollY = hasDisplayList ? 0 : sy; 13068 canvas.saveLayer(scrollX, scrollY, 13069 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13070 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13071 } 13072 } 13073 13074 if (!layerRendered) { 13075 if (!hasDisplayList) { 13076 // Fast path for layouts with no backgrounds 13077 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13078 mPrivateFlags &= ~DIRTY_MASK; 13079 dispatchDraw(canvas); 13080 } else { 13081 draw(canvas); 13082 } 13083 } else { 13084 mPrivateFlags &= ~DIRTY_MASK; 13085 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13086 } 13087 } 13088 } else if (cache != null) { 13089 mPrivateFlags &= ~DIRTY_MASK; 13090 Paint cachePaint; 13091 13092 if (layerType == LAYER_TYPE_NONE) { 13093 cachePaint = parent.mCachePaint; 13094 if (cachePaint == null) { 13095 cachePaint = new Paint(); 13096 cachePaint.setDither(false); 13097 parent.mCachePaint = cachePaint; 13098 } 13099 if (alpha < 1) { 13100 cachePaint.setAlpha((int) (alpha * 255)); 13101 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13102 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13103 cachePaint.setAlpha(255); 13104 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13105 } 13106 } else { 13107 cachePaint = mLayerPaint; 13108 cachePaint.setAlpha((int) (alpha * 255)); 13109 } 13110 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13111 } 13112 13113 if (restoreTo >= 0) { 13114 canvas.restoreToCount(restoreTo); 13115 } 13116 13117 if (a != null && !more) { 13118 if (!hardwareAccelerated && !a.getFillAfter()) { 13119 onSetAlpha(255); 13120 } 13121 parent.finishAnimatingView(this, a); 13122 } 13123 13124 if (more && hardwareAccelerated) { 13125 // invalidation is the trigger to recreate display lists, so if we're using 13126 // display lists to render, force an invalidate to allow the animation to 13127 // continue drawing another frame 13128 parent.invalidate(true); 13129 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13130 // alpha animations should cause the child to recreate its display list 13131 invalidate(true); 13132 } 13133 } 13134 13135 mRecreateDisplayList = false; 13136 13137 return more; 13138 } 13139 13140 /** 13141 * Manually render this view (and all of its children) to the given Canvas. 13142 * The view must have already done a full layout before this function is 13143 * called. When implementing a view, implement 13144 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13145 * If you do need to override this method, call the superclass version. 13146 * 13147 * @param canvas The Canvas to which the View is rendered. 13148 */ 13149 public void draw(Canvas canvas) { 13150 final int privateFlags = mPrivateFlags; 13151 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13152 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13153 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13154 13155 /* 13156 * Draw traversal performs several drawing steps which must be executed 13157 * in the appropriate order: 13158 * 13159 * 1. Draw the background 13160 * 2. If necessary, save the canvas' layers to prepare for fading 13161 * 3. Draw view's content 13162 * 4. Draw children 13163 * 5. If necessary, draw the fading edges and restore layers 13164 * 6. Draw decorations (scrollbars for instance) 13165 */ 13166 13167 // Step 1, draw the background, if needed 13168 int saveCount; 13169 13170 if (!dirtyOpaque) { 13171 final Drawable background = mBackground; 13172 if (background != null) { 13173 final int scrollX = mScrollX; 13174 final int scrollY = mScrollY; 13175 13176 if (mBackgroundSizeChanged) { 13177 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13178 mBackgroundSizeChanged = false; 13179 } 13180 13181 if ((scrollX | scrollY) == 0) { 13182 background.draw(canvas); 13183 } else { 13184 canvas.translate(scrollX, scrollY); 13185 background.draw(canvas); 13186 canvas.translate(-scrollX, -scrollY); 13187 } 13188 } 13189 } 13190 13191 // skip step 2 & 5 if possible (common case) 13192 final int viewFlags = mViewFlags; 13193 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13194 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13195 if (!verticalEdges && !horizontalEdges) { 13196 // Step 3, draw the content 13197 if (!dirtyOpaque) onDraw(canvas); 13198 13199 // Step 4, draw the children 13200 dispatchDraw(canvas); 13201 13202 // Step 6, draw decorations (scrollbars) 13203 onDrawScrollBars(canvas); 13204 13205 // we're done... 13206 return; 13207 } 13208 13209 /* 13210 * Here we do the full fledged routine... 13211 * (this is an uncommon case where speed matters less, 13212 * this is why we repeat some of the tests that have been 13213 * done above) 13214 */ 13215 13216 boolean drawTop = false; 13217 boolean drawBottom = false; 13218 boolean drawLeft = false; 13219 boolean drawRight = false; 13220 13221 float topFadeStrength = 0.0f; 13222 float bottomFadeStrength = 0.0f; 13223 float leftFadeStrength = 0.0f; 13224 float rightFadeStrength = 0.0f; 13225 13226 // Step 2, save the canvas' layers 13227 int paddingLeft = mPaddingLeft; 13228 13229 final boolean offsetRequired = isPaddingOffsetRequired(); 13230 if (offsetRequired) { 13231 paddingLeft += getLeftPaddingOffset(); 13232 } 13233 13234 int left = mScrollX + paddingLeft; 13235 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13236 int top = mScrollY + getFadeTop(offsetRequired); 13237 int bottom = top + getFadeHeight(offsetRequired); 13238 13239 if (offsetRequired) { 13240 right += getRightPaddingOffset(); 13241 bottom += getBottomPaddingOffset(); 13242 } 13243 13244 final ScrollabilityCache scrollabilityCache = mScrollCache; 13245 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13246 int length = (int) fadeHeight; 13247 13248 // clip the fade length if top and bottom fades overlap 13249 // overlapping fades produce odd-looking artifacts 13250 if (verticalEdges && (top + length > bottom - length)) { 13251 length = (bottom - top) / 2; 13252 } 13253 13254 // also clip horizontal fades if necessary 13255 if (horizontalEdges && (left + length > right - length)) { 13256 length = (right - left) / 2; 13257 } 13258 13259 if (verticalEdges) { 13260 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13261 drawTop = topFadeStrength * fadeHeight > 1.0f; 13262 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13263 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13264 } 13265 13266 if (horizontalEdges) { 13267 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13268 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13269 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13270 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13271 } 13272 13273 saveCount = canvas.getSaveCount(); 13274 13275 int solidColor = getSolidColor(); 13276 if (solidColor == 0) { 13277 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13278 13279 if (drawTop) { 13280 canvas.saveLayer(left, top, right, top + length, null, flags); 13281 } 13282 13283 if (drawBottom) { 13284 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13285 } 13286 13287 if (drawLeft) { 13288 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13289 } 13290 13291 if (drawRight) { 13292 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13293 } 13294 } else { 13295 scrollabilityCache.setFadeColor(solidColor); 13296 } 13297 13298 // Step 3, draw the content 13299 if (!dirtyOpaque) onDraw(canvas); 13300 13301 // Step 4, draw the children 13302 dispatchDraw(canvas); 13303 13304 // Step 5, draw the fade effect and restore layers 13305 final Paint p = scrollabilityCache.paint; 13306 final Matrix matrix = scrollabilityCache.matrix; 13307 final Shader fade = scrollabilityCache.shader; 13308 13309 if (drawTop) { 13310 matrix.setScale(1, fadeHeight * topFadeStrength); 13311 matrix.postTranslate(left, top); 13312 fade.setLocalMatrix(matrix); 13313 canvas.drawRect(left, top, right, top + length, p); 13314 } 13315 13316 if (drawBottom) { 13317 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13318 matrix.postRotate(180); 13319 matrix.postTranslate(left, bottom); 13320 fade.setLocalMatrix(matrix); 13321 canvas.drawRect(left, bottom - length, right, bottom, p); 13322 } 13323 13324 if (drawLeft) { 13325 matrix.setScale(1, fadeHeight * leftFadeStrength); 13326 matrix.postRotate(-90); 13327 matrix.postTranslate(left, top); 13328 fade.setLocalMatrix(matrix); 13329 canvas.drawRect(left, top, left + length, bottom, p); 13330 } 13331 13332 if (drawRight) { 13333 matrix.setScale(1, fadeHeight * rightFadeStrength); 13334 matrix.postRotate(90); 13335 matrix.postTranslate(right, top); 13336 fade.setLocalMatrix(matrix); 13337 canvas.drawRect(right - length, top, right, bottom, p); 13338 } 13339 13340 canvas.restoreToCount(saveCount); 13341 13342 // Step 6, draw decorations (scrollbars) 13343 onDrawScrollBars(canvas); 13344 } 13345 13346 /** 13347 * Override this if your view is known to always be drawn on top of a solid color background, 13348 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13349 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13350 * should be set to 0xFF. 13351 * 13352 * @see #setVerticalFadingEdgeEnabled(boolean) 13353 * @see #setHorizontalFadingEdgeEnabled(boolean) 13354 * 13355 * @return The known solid color background for this view, or 0 if the color may vary 13356 */ 13357 @ViewDebug.ExportedProperty(category = "drawing") 13358 public int getSolidColor() { 13359 return 0; 13360 } 13361 13362 /** 13363 * Build a human readable string representation of the specified view flags. 13364 * 13365 * @param flags the view flags to convert to a string 13366 * @return a String representing the supplied flags 13367 */ 13368 private static String printFlags(int flags) { 13369 String output = ""; 13370 int numFlags = 0; 13371 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13372 output += "TAKES_FOCUS"; 13373 numFlags++; 13374 } 13375 13376 switch (flags & VISIBILITY_MASK) { 13377 case INVISIBLE: 13378 if (numFlags > 0) { 13379 output += " "; 13380 } 13381 output += "INVISIBLE"; 13382 // USELESS HERE numFlags++; 13383 break; 13384 case GONE: 13385 if (numFlags > 0) { 13386 output += " "; 13387 } 13388 output += "GONE"; 13389 // USELESS HERE numFlags++; 13390 break; 13391 default: 13392 break; 13393 } 13394 return output; 13395 } 13396 13397 /** 13398 * Build a human readable string representation of the specified private 13399 * view flags. 13400 * 13401 * @param privateFlags the private view flags to convert to a string 13402 * @return a String representing the supplied flags 13403 */ 13404 private static String printPrivateFlags(int privateFlags) { 13405 String output = ""; 13406 int numFlags = 0; 13407 13408 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13409 output += "WANTS_FOCUS"; 13410 numFlags++; 13411 } 13412 13413 if ((privateFlags & FOCUSED) == FOCUSED) { 13414 if (numFlags > 0) { 13415 output += " "; 13416 } 13417 output += "FOCUSED"; 13418 numFlags++; 13419 } 13420 13421 if ((privateFlags & SELECTED) == SELECTED) { 13422 if (numFlags > 0) { 13423 output += " "; 13424 } 13425 output += "SELECTED"; 13426 numFlags++; 13427 } 13428 13429 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13430 if (numFlags > 0) { 13431 output += " "; 13432 } 13433 output += "IS_ROOT_NAMESPACE"; 13434 numFlags++; 13435 } 13436 13437 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13438 if (numFlags > 0) { 13439 output += " "; 13440 } 13441 output += "HAS_BOUNDS"; 13442 numFlags++; 13443 } 13444 13445 if ((privateFlags & DRAWN) == DRAWN) { 13446 if (numFlags > 0) { 13447 output += " "; 13448 } 13449 output += "DRAWN"; 13450 // USELESS HERE numFlags++; 13451 } 13452 return output; 13453 } 13454 13455 /** 13456 * <p>Indicates whether or not this view's layout will be requested during 13457 * the next hierarchy layout pass.</p> 13458 * 13459 * @return true if the layout will be forced during next layout pass 13460 */ 13461 public boolean isLayoutRequested() { 13462 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13463 } 13464 13465 /** 13466 * Assign a size and position to a view and all of its 13467 * descendants 13468 * 13469 * <p>This is the second phase of the layout mechanism. 13470 * (The first is measuring). In this phase, each parent calls 13471 * layout on all of its children to position them. 13472 * This is typically done using the child measurements 13473 * that were stored in the measure pass().</p> 13474 * 13475 * <p>Derived classes should not override this method. 13476 * Derived classes with children should override 13477 * onLayout. In that method, they should 13478 * call layout on each of their children.</p> 13479 * 13480 * @param l Left position, relative to parent 13481 * @param t Top position, relative to parent 13482 * @param r Right position, relative to parent 13483 * @param b Bottom position, relative to parent 13484 */ 13485 @SuppressWarnings({"unchecked"}) 13486 public void layout(int l, int t, int r, int b) { 13487 int oldL = mLeft; 13488 int oldT = mTop; 13489 int oldB = mBottom; 13490 int oldR = mRight; 13491 boolean changed = setFrame(l, t, r, b); 13492 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13493 onLayout(changed, l, t, r, b); 13494 mPrivateFlags &= ~LAYOUT_REQUIRED; 13495 13496 ListenerInfo li = mListenerInfo; 13497 if (li != null && li.mOnLayoutChangeListeners != null) { 13498 ArrayList<OnLayoutChangeListener> listenersCopy = 13499 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13500 int numListeners = listenersCopy.size(); 13501 for (int i = 0; i < numListeners; ++i) { 13502 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13503 } 13504 } 13505 } 13506 mPrivateFlags &= ~FORCE_LAYOUT; 13507 } 13508 13509 /** 13510 * Called from layout when this view should 13511 * assign a size and position to each of its children. 13512 * 13513 * Derived classes with children should override 13514 * this method and call layout on each of 13515 * their children. 13516 * @param changed This is a new size or position for this view 13517 * @param left Left position, relative to parent 13518 * @param top Top position, relative to parent 13519 * @param right Right position, relative to parent 13520 * @param bottom Bottom position, relative to parent 13521 */ 13522 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13523 } 13524 13525 /** 13526 * Assign a size and position to this view. 13527 * 13528 * This is called from layout. 13529 * 13530 * @param left Left position, relative to parent 13531 * @param top Top position, relative to parent 13532 * @param right Right position, relative to parent 13533 * @param bottom Bottom position, relative to parent 13534 * @return true if the new size and position are different than the 13535 * previous ones 13536 * {@hide} 13537 */ 13538 protected boolean setFrame(int left, int top, int right, int bottom) { 13539 boolean changed = false; 13540 13541 if (DBG) { 13542 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13543 + right + "," + bottom + ")"); 13544 } 13545 13546 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13547 changed = true; 13548 13549 // Remember our drawn bit 13550 int drawn = mPrivateFlags & DRAWN; 13551 13552 int oldWidth = mRight - mLeft; 13553 int oldHeight = mBottom - mTop; 13554 int newWidth = right - left; 13555 int newHeight = bottom - top; 13556 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13557 13558 // Invalidate our old position 13559 invalidate(sizeChanged); 13560 13561 mLeft = left; 13562 mTop = top; 13563 mRight = right; 13564 mBottom = bottom; 13565 if (mDisplayList != null) { 13566 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13567 } 13568 13569 mPrivateFlags |= HAS_BOUNDS; 13570 13571 13572 if (sizeChanged) { 13573 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13574 // A change in dimension means an auto-centered pivot point changes, too 13575 if (mTransformationInfo != null) { 13576 mTransformationInfo.mMatrixDirty = true; 13577 } 13578 } 13579 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13580 } 13581 13582 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13583 // If we are visible, force the DRAWN bit to on so that 13584 // this invalidate will go through (at least to our parent). 13585 // This is because someone may have invalidated this view 13586 // before this call to setFrame came in, thereby clearing 13587 // the DRAWN bit. 13588 mPrivateFlags |= DRAWN; 13589 invalidate(sizeChanged); 13590 // parent display list may need to be recreated based on a change in the bounds 13591 // of any child 13592 invalidateParentCaches(); 13593 } 13594 13595 // Reset drawn bit to original value (invalidate turns it off) 13596 mPrivateFlags |= drawn; 13597 13598 mBackgroundSizeChanged = true; 13599 } 13600 return changed; 13601 } 13602 13603 /** 13604 * Finalize inflating a view from XML. This is called as the last phase 13605 * of inflation, after all child views have been added. 13606 * 13607 * <p>Even if the subclass overrides onFinishInflate, they should always be 13608 * sure to call the super method, so that we get called. 13609 */ 13610 protected void onFinishInflate() { 13611 } 13612 13613 /** 13614 * Returns the resources associated with this view. 13615 * 13616 * @return Resources object. 13617 */ 13618 public Resources getResources() { 13619 return mResources; 13620 } 13621 13622 /** 13623 * Invalidates the specified Drawable. 13624 * 13625 * @param drawable the drawable to invalidate 13626 */ 13627 public void invalidateDrawable(Drawable drawable) { 13628 if (verifyDrawable(drawable)) { 13629 final Rect dirty = drawable.getBounds(); 13630 final int scrollX = mScrollX; 13631 final int scrollY = mScrollY; 13632 13633 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13634 dirty.right + scrollX, dirty.bottom + scrollY); 13635 } 13636 } 13637 13638 /** 13639 * Schedules an action on a drawable to occur at a specified time. 13640 * 13641 * @param who the recipient of the action 13642 * @param what the action to run on the drawable 13643 * @param when the time at which the action must occur. Uses the 13644 * {@link SystemClock#uptimeMillis} timebase. 13645 */ 13646 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13647 if (verifyDrawable(who) && what != null) { 13648 final long delay = when - SystemClock.uptimeMillis(); 13649 if (mAttachInfo != null) { 13650 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13651 Choreographer.CALLBACK_ANIMATION, what, who, 13652 Choreographer.subtractFrameDelay(delay)); 13653 } else { 13654 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13655 } 13656 } 13657 } 13658 13659 /** 13660 * Cancels a scheduled action on a drawable. 13661 * 13662 * @param who the recipient of the action 13663 * @param what the action to cancel 13664 */ 13665 public void unscheduleDrawable(Drawable who, Runnable what) { 13666 if (verifyDrawable(who) && what != null) { 13667 if (mAttachInfo != null) { 13668 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13669 Choreographer.CALLBACK_ANIMATION, what, who); 13670 } else { 13671 ViewRootImpl.getRunQueue().removeCallbacks(what); 13672 } 13673 } 13674 } 13675 13676 /** 13677 * Unschedule any events associated with the given Drawable. This can be 13678 * used when selecting a new Drawable into a view, so that the previous 13679 * one is completely unscheduled. 13680 * 13681 * @param who The Drawable to unschedule. 13682 * 13683 * @see #drawableStateChanged 13684 */ 13685 public void unscheduleDrawable(Drawable who) { 13686 if (mAttachInfo != null && who != null) { 13687 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13688 Choreographer.CALLBACK_ANIMATION, null, who); 13689 } 13690 } 13691 13692 /** 13693 * Return the layout direction of a given Drawable. 13694 * 13695 * @param who the Drawable to query 13696 */ 13697 public int getResolvedLayoutDirection(Drawable who) { 13698 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13699 } 13700 13701 /** 13702 * If your view subclass is displaying its own Drawable objects, it should 13703 * override this function and return true for any Drawable it is 13704 * displaying. This allows animations for those drawables to be 13705 * scheduled. 13706 * 13707 * <p>Be sure to call through to the super class when overriding this 13708 * function. 13709 * 13710 * @param who The Drawable to verify. Return true if it is one you are 13711 * displaying, else return the result of calling through to the 13712 * super class. 13713 * 13714 * @return boolean If true than the Drawable is being displayed in the 13715 * view; else false and it is not allowed to animate. 13716 * 13717 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13718 * @see #drawableStateChanged() 13719 */ 13720 protected boolean verifyDrawable(Drawable who) { 13721 return who == mBackground; 13722 } 13723 13724 /** 13725 * This function is called whenever the state of the view changes in such 13726 * a way that it impacts the state of drawables being shown. 13727 * 13728 * <p>Be sure to call through to the superclass when overriding this 13729 * function. 13730 * 13731 * @see Drawable#setState(int[]) 13732 */ 13733 protected void drawableStateChanged() { 13734 Drawable d = mBackground; 13735 if (d != null && d.isStateful()) { 13736 d.setState(getDrawableState()); 13737 } 13738 } 13739 13740 /** 13741 * Call this to force a view to update its drawable state. This will cause 13742 * drawableStateChanged to be called on this view. Views that are interested 13743 * in the new state should call getDrawableState. 13744 * 13745 * @see #drawableStateChanged 13746 * @see #getDrawableState 13747 */ 13748 public void refreshDrawableState() { 13749 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13750 drawableStateChanged(); 13751 13752 ViewParent parent = mParent; 13753 if (parent != null) { 13754 parent.childDrawableStateChanged(this); 13755 } 13756 } 13757 13758 /** 13759 * Return an array of resource IDs of the drawable states representing the 13760 * current state of the view. 13761 * 13762 * @return The current drawable state 13763 * 13764 * @see Drawable#setState(int[]) 13765 * @see #drawableStateChanged() 13766 * @see #onCreateDrawableState(int) 13767 */ 13768 public final int[] getDrawableState() { 13769 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13770 return mDrawableState; 13771 } else { 13772 mDrawableState = onCreateDrawableState(0); 13773 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13774 return mDrawableState; 13775 } 13776 } 13777 13778 /** 13779 * Generate the new {@link android.graphics.drawable.Drawable} state for 13780 * this view. This is called by the view 13781 * system when the cached Drawable state is determined to be invalid. To 13782 * retrieve the current state, you should use {@link #getDrawableState}. 13783 * 13784 * @param extraSpace if non-zero, this is the number of extra entries you 13785 * would like in the returned array in which you can place your own 13786 * states. 13787 * 13788 * @return Returns an array holding the current {@link Drawable} state of 13789 * the view. 13790 * 13791 * @see #mergeDrawableStates(int[], int[]) 13792 */ 13793 protected int[] onCreateDrawableState(int extraSpace) { 13794 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13795 mParent instanceof View) { 13796 return ((View) mParent).onCreateDrawableState(extraSpace); 13797 } 13798 13799 int[] drawableState; 13800 13801 int privateFlags = mPrivateFlags; 13802 13803 int viewStateIndex = 0; 13804 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13805 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13806 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13807 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13808 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13809 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13810 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13811 HardwareRenderer.isAvailable()) { 13812 // This is set if HW acceleration is requested, even if the current 13813 // process doesn't allow it. This is just to allow app preview 13814 // windows to better match their app. 13815 viewStateIndex |= VIEW_STATE_ACCELERATED; 13816 } 13817 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13818 13819 final int privateFlags2 = mPrivateFlags2; 13820 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13821 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13822 13823 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13824 13825 //noinspection ConstantIfStatement 13826 if (false) { 13827 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13828 Log.i("View", toString() 13829 + " pressed=" + ((privateFlags & PRESSED) != 0) 13830 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13831 + " fo=" + hasFocus() 13832 + " sl=" + ((privateFlags & SELECTED) != 0) 13833 + " wf=" + hasWindowFocus() 13834 + ": " + Arrays.toString(drawableState)); 13835 } 13836 13837 if (extraSpace == 0) { 13838 return drawableState; 13839 } 13840 13841 final int[] fullState; 13842 if (drawableState != null) { 13843 fullState = new int[drawableState.length + extraSpace]; 13844 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13845 } else { 13846 fullState = new int[extraSpace]; 13847 } 13848 13849 return fullState; 13850 } 13851 13852 /** 13853 * Merge your own state values in <var>additionalState</var> into the base 13854 * state values <var>baseState</var> that were returned by 13855 * {@link #onCreateDrawableState(int)}. 13856 * 13857 * @param baseState The base state values returned by 13858 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13859 * own additional state values. 13860 * 13861 * @param additionalState The additional state values you would like 13862 * added to <var>baseState</var>; this array is not modified. 13863 * 13864 * @return As a convenience, the <var>baseState</var> array you originally 13865 * passed into the function is returned. 13866 * 13867 * @see #onCreateDrawableState(int) 13868 */ 13869 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13870 final int N = baseState.length; 13871 int i = N - 1; 13872 while (i >= 0 && baseState[i] == 0) { 13873 i--; 13874 } 13875 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13876 return baseState; 13877 } 13878 13879 /** 13880 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13881 * on all Drawable objects associated with this view. 13882 */ 13883 public void jumpDrawablesToCurrentState() { 13884 if (mBackground != null) { 13885 mBackground.jumpToCurrentState(); 13886 } 13887 } 13888 13889 /** 13890 * Sets the background color for this view. 13891 * @param color the color of the background 13892 */ 13893 @RemotableViewMethod 13894 public void setBackgroundColor(int color) { 13895 if (mBackground instanceof ColorDrawable) { 13896 ((ColorDrawable) mBackground).setColor(color); 13897 } else { 13898 setBackground(new ColorDrawable(color)); 13899 } 13900 } 13901 13902 /** 13903 * Set the background to a given resource. The resource should refer to 13904 * a Drawable object or 0 to remove the background. 13905 * @param resid The identifier of the resource. 13906 * 13907 * @attr ref android.R.styleable#View_background 13908 */ 13909 @RemotableViewMethod 13910 public void setBackgroundResource(int resid) { 13911 if (resid != 0 && resid == mBackgroundResource) { 13912 return; 13913 } 13914 13915 Drawable d= null; 13916 if (resid != 0) { 13917 d = mResources.getDrawable(resid); 13918 } 13919 setBackground(d); 13920 13921 mBackgroundResource = resid; 13922 } 13923 13924 /** 13925 * Set the background to a given Drawable, or remove the background. If the 13926 * background has padding, this View's padding is set to the background's 13927 * padding. However, when a background is removed, this View's padding isn't 13928 * touched. If setting the padding is desired, please use 13929 * {@link #setPadding(int, int, int, int)}. 13930 * 13931 * @param background The Drawable to use as the background, or null to remove the 13932 * background 13933 */ 13934 public void setBackground(Drawable background) { 13935 //noinspection deprecation 13936 setBackgroundDrawable(background); 13937 } 13938 13939 /** 13940 * @deprecated use {@link #setBackground(Drawable)} instead 13941 */ 13942 @Deprecated 13943 public void setBackgroundDrawable(Drawable background) { 13944 if (background == mBackground) { 13945 return; 13946 } 13947 13948 boolean requestLayout = false; 13949 13950 mBackgroundResource = 0; 13951 13952 /* 13953 * Regardless of whether we're setting a new background or not, we want 13954 * to clear the previous drawable. 13955 */ 13956 if (mBackground != null) { 13957 mBackground.setCallback(null); 13958 unscheduleDrawable(mBackground); 13959 } 13960 13961 if (background != null) { 13962 Rect padding = sThreadLocal.get(); 13963 if (padding == null) { 13964 padding = new Rect(); 13965 sThreadLocal.set(padding); 13966 } 13967 if (background.getPadding(padding)) { 13968 switch (background.getResolvedLayoutDirectionSelf()) { 13969 case LAYOUT_DIRECTION_RTL: 13970 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13971 break; 13972 case LAYOUT_DIRECTION_LTR: 13973 default: 13974 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13975 } 13976 } 13977 13978 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13979 // if it has a different minimum size, we should layout again 13980 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13981 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13982 requestLayout = true; 13983 } 13984 13985 background.setCallback(this); 13986 if (background.isStateful()) { 13987 background.setState(getDrawableState()); 13988 } 13989 background.setVisible(getVisibility() == VISIBLE, false); 13990 mBackground = background; 13991 13992 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13993 mPrivateFlags &= ~SKIP_DRAW; 13994 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13995 requestLayout = true; 13996 } 13997 } else { 13998 /* Remove the background */ 13999 mBackground = null; 14000 14001 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14002 /* 14003 * This view ONLY drew the background before and we're removing 14004 * the background, so now it won't draw anything 14005 * (hence we SKIP_DRAW) 14006 */ 14007 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14008 mPrivateFlags |= SKIP_DRAW; 14009 } 14010 14011 /* 14012 * When the background is set, we try to apply its padding to this 14013 * View. When the background is removed, we don't touch this View's 14014 * padding. This is noted in the Javadocs. Hence, we don't need to 14015 * requestLayout(), the invalidate() below is sufficient. 14016 */ 14017 14018 // The old background's minimum size could have affected this 14019 // View's layout, so let's requestLayout 14020 requestLayout = true; 14021 } 14022 14023 computeOpaqueFlags(); 14024 14025 if (requestLayout) { 14026 requestLayout(); 14027 } 14028 14029 mBackgroundSizeChanged = true; 14030 invalidate(true); 14031 } 14032 14033 /** 14034 * Gets the background drawable 14035 * 14036 * @return The drawable used as the background for this view, if any. 14037 * 14038 * @see #setBackground(Drawable) 14039 * 14040 * @attr ref android.R.styleable#View_background 14041 */ 14042 public Drawable getBackground() { 14043 return mBackground; 14044 } 14045 14046 /** 14047 * Sets the padding. The view may add on the space required to display 14048 * the scrollbars, depending on the style and visibility of the scrollbars. 14049 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14050 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14051 * from the values set in this call. 14052 * 14053 * @attr ref android.R.styleable#View_padding 14054 * @attr ref android.R.styleable#View_paddingBottom 14055 * @attr ref android.R.styleable#View_paddingLeft 14056 * @attr ref android.R.styleable#View_paddingRight 14057 * @attr ref android.R.styleable#View_paddingTop 14058 * @param left the left padding in pixels 14059 * @param top the top padding in pixels 14060 * @param right the right padding in pixels 14061 * @param bottom the bottom padding in pixels 14062 */ 14063 public void setPadding(int left, int top, int right, int bottom) { 14064 mUserPaddingStart = -1; 14065 mUserPaddingEnd = -1; 14066 mUserPaddingRelative = false; 14067 14068 internalSetPadding(left, top, right, bottom); 14069 } 14070 14071 private void internalSetPadding(int left, int top, int right, int bottom) { 14072 mUserPaddingLeft = left; 14073 mUserPaddingRight = right; 14074 mUserPaddingBottom = bottom; 14075 14076 final int viewFlags = mViewFlags; 14077 boolean changed = false; 14078 14079 // Common case is there are no scroll bars. 14080 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14081 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14082 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14083 ? 0 : getVerticalScrollbarWidth(); 14084 switch (mVerticalScrollbarPosition) { 14085 case SCROLLBAR_POSITION_DEFAULT: 14086 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14087 left += offset; 14088 } else { 14089 right += offset; 14090 } 14091 break; 14092 case SCROLLBAR_POSITION_RIGHT: 14093 right += offset; 14094 break; 14095 case SCROLLBAR_POSITION_LEFT: 14096 left += offset; 14097 break; 14098 } 14099 } 14100 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14101 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14102 ? 0 : getHorizontalScrollbarHeight(); 14103 } 14104 } 14105 14106 if (mPaddingLeft != left) { 14107 changed = true; 14108 mPaddingLeft = left; 14109 } 14110 if (mPaddingTop != top) { 14111 changed = true; 14112 mPaddingTop = top; 14113 } 14114 if (mPaddingRight != right) { 14115 changed = true; 14116 mPaddingRight = right; 14117 } 14118 if (mPaddingBottom != bottom) { 14119 changed = true; 14120 mPaddingBottom = bottom; 14121 } 14122 14123 if (changed) { 14124 requestLayout(); 14125 } 14126 } 14127 14128 /** 14129 * Sets the relative padding. The view may add on the space required to display 14130 * the scrollbars, depending on the style and visibility of the scrollbars. 14131 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14132 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14133 * from the values set in this call. 14134 * 14135 * @attr ref android.R.styleable#View_padding 14136 * @attr ref android.R.styleable#View_paddingBottom 14137 * @attr ref android.R.styleable#View_paddingStart 14138 * @attr ref android.R.styleable#View_paddingEnd 14139 * @attr ref android.R.styleable#View_paddingTop 14140 * @param start the start padding in pixels 14141 * @param top the top padding in pixels 14142 * @param end the end padding in pixels 14143 * @param bottom the bottom padding in pixels 14144 */ 14145 public void setPaddingRelative(int start, int top, int end, int bottom) { 14146 mUserPaddingStart = start; 14147 mUserPaddingEnd = end; 14148 mUserPaddingRelative = true; 14149 14150 switch(getResolvedLayoutDirection()) { 14151 case LAYOUT_DIRECTION_RTL: 14152 internalSetPadding(end, top, start, bottom); 14153 break; 14154 case LAYOUT_DIRECTION_LTR: 14155 default: 14156 internalSetPadding(start, top, end, bottom); 14157 } 14158 } 14159 14160 /** 14161 * Returns the top padding of this view. 14162 * 14163 * @return the top padding in pixels 14164 */ 14165 public int getPaddingTop() { 14166 return mPaddingTop; 14167 } 14168 14169 /** 14170 * Returns the bottom padding of this view. If there are inset and enabled 14171 * scrollbars, this value may include the space required to display the 14172 * scrollbars as well. 14173 * 14174 * @return the bottom padding in pixels 14175 */ 14176 public int getPaddingBottom() { 14177 return mPaddingBottom; 14178 } 14179 14180 /** 14181 * Returns the left padding of this view. If there are inset and enabled 14182 * scrollbars, this value may include the space required to display the 14183 * scrollbars as well. 14184 * 14185 * @return the left padding in pixels 14186 */ 14187 public int getPaddingLeft() { 14188 return mPaddingLeft; 14189 } 14190 14191 /** 14192 * Returns the start padding of this view depending on its resolved layout direction. 14193 * If there are inset and enabled scrollbars, this value may include the space 14194 * required to display the scrollbars as well. 14195 * 14196 * @return the start padding in pixels 14197 */ 14198 public int getPaddingStart() { 14199 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14200 mPaddingRight : mPaddingLeft; 14201 } 14202 14203 /** 14204 * Returns the right padding of this view. If there are inset and enabled 14205 * scrollbars, this value may include the space required to display the 14206 * scrollbars as well. 14207 * 14208 * @return the right padding in pixels 14209 */ 14210 public int getPaddingRight() { 14211 return mPaddingRight; 14212 } 14213 14214 /** 14215 * Returns the end padding of this view depending on its resolved layout direction. 14216 * If there are inset and enabled scrollbars, this value may include the space 14217 * required to display the scrollbars as well. 14218 * 14219 * @return the end padding in pixels 14220 */ 14221 public int getPaddingEnd() { 14222 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14223 mPaddingLeft : mPaddingRight; 14224 } 14225 14226 /** 14227 * Return if the padding as been set thru relative values 14228 * {@link #setPaddingRelative(int, int, int, int)} or thru 14229 * @attr ref android.R.styleable#View_paddingStart or 14230 * @attr ref android.R.styleable#View_paddingEnd 14231 * 14232 * @return true if the padding is relative or false if it is not. 14233 */ 14234 public boolean isPaddingRelative() { 14235 return mUserPaddingRelative; 14236 } 14237 14238 /** 14239 * @hide 14240 */ 14241 public Insets getOpticalInsets() { 14242 if (mLayoutInsets == null) { 14243 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14244 } 14245 return mLayoutInsets; 14246 } 14247 14248 /** 14249 * @hide 14250 */ 14251 public void setLayoutInsets(Insets layoutInsets) { 14252 mLayoutInsets = layoutInsets; 14253 } 14254 14255 /** 14256 * Changes the selection state of this view. A view can be selected or not. 14257 * Note that selection is not the same as focus. Views are typically 14258 * selected in the context of an AdapterView like ListView or GridView; 14259 * the selected view is the view that is highlighted. 14260 * 14261 * @param selected true if the view must be selected, false otherwise 14262 */ 14263 public void setSelected(boolean selected) { 14264 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14265 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14266 if (!selected) resetPressedState(); 14267 invalidate(true); 14268 refreshDrawableState(); 14269 dispatchSetSelected(selected); 14270 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14271 notifyAccessibilityStateChanged(); 14272 } 14273 } 14274 } 14275 14276 /** 14277 * Dispatch setSelected to all of this View's children. 14278 * 14279 * @see #setSelected(boolean) 14280 * 14281 * @param selected The new selected state 14282 */ 14283 protected void dispatchSetSelected(boolean selected) { 14284 } 14285 14286 /** 14287 * Indicates the selection state of this view. 14288 * 14289 * @return true if the view is selected, false otherwise 14290 */ 14291 @ViewDebug.ExportedProperty 14292 public boolean isSelected() { 14293 return (mPrivateFlags & SELECTED) != 0; 14294 } 14295 14296 /** 14297 * Changes the activated state of this view. A view can be activated or not. 14298 * Note that activation is not the same as selection. Selection is 14299 * a transient property, representing the view (hierarchy) the user is 14300 * currently interacting with. Activation is a longer-term state that the 14301 * user can move views in and out of. For example, in a list view with 14302 * single or multiple selection enabled, the views in the current selection 14303 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14304 * here.) The activated state is propagated down to children of the view it 14305 * is set on. 14306 * 14307 * @param activated true if the view must be activated, false otherwise 14308 */ 14309 public void setActivated(boolean activated) { 14310 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14311 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14312 invalidate(true); 14313 refreshDrawableState(); 14314 dispatchSetActivated(activated); 14315 } 14316 } 14317 14318 /** 14319 * Dispatch setActivated to all of this View's children. 14320 * 14321 * @see #setActivated(boolean) 14322 * 14323 * @param activated The new activated state 14324 */ 14325 protected void dispatchSetActivated(boolean activated) { 14326 } 14327 14328 /** 14329 * Indicates the activation state of this view. 14330 * 14331 * @return true if the view is activated, false otherwise 14332 */ 14333 @ViewDebug.ExportedProperty 14334 public boolean isActivated() { 14335 return (mPrivateFlags & ACTIVATED) != 0; 14336 } 14337 14338 /** 14339 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14340 * observer can be used to get notifications when global events, like 14341 * layout, happen. 14342 * 14343 * The returned ViewTreeObserver observer is not guaranteed to remain 14344 * valid for the lifetime of this View. If the caller of this method keeps 14345 * a long-lived reference to ViewTreeObserver, it should always check for 14346 * the return value of {@link ViewTreeObserver#isAlive()}. 14347 * 14348 * @return The ViewTreeObserver for this view's hierarchy. 14349 */ 14350 public ViewTreeObserver getViewTreeObserver() { 14351 if (mAttachInfo != null) { 14352 return mAttachInfo.mTreeObserver; 14353 } 14354 if (mFloatingTreeObserver == null) { 14355 mFloatingTreeObserver = new ViewTreeObserver(); 14356 } 14357 return mFloatingTreeObserver; 14358 } 14359 14360 /** 14361 * <p>Finds the topmost view in the current view hierarchy.</p> 14362 * 14363 * @return the topmost view containing this view 14364 */ 14365 public View getRootView() { 14366 if (mAttachInfo != null) { 14367 final View v = mAttachInfo.mRootView; 14368 if (v != null) { 14369 return v; 14370 } 14371 } 14372 14373 View parent = this; 14374 14375 while (parent.mParent != null && parent.mParent instanceof View) { 14376 parent = (View) parent.mParent; 14377 } 14378 14379 return parent; 14380 } 14381 14382 /** 14383 * <p>Computes the coordinates of this view on the screen. The argument 14384 * must be an array of two integers. After the method returns, the array 14385 * contains the x and y location in that order.</p> 14386 * 14387 * @param location an array of two integers in which to hold the coordinates 14388 */ 14389 public void getLocationOnScreen(int[] location) { 14390 getLocationInWindow(location); 14391 14392 final AttachInfo info = mAttachInfo; 14393 if (info != null) { 14394 location[0] += info.mWindowLeft; 14395 location[1] += info.mWindowTop; 14396 } 14397 } 14398 14399 /** 14400 * <p>Computes the coordinates of this view in its window. The argument 14401 * must be an array of two integers. After the method returns, the array 14402 * contains the x and y location in that order.</p> 14403 * 14404 * @param location an array of two integers in which to hold the coordinates 14405 */ 14406 public void getLocationInWindow(int[] location) { 14407 if (location == null || location.length < 2) { 14408 throw new IllegalArgumentException("location must be an array of two integers"); 14409 } 14410 14411 if (mAttachInfo == null) { 14412 // When the view is not attached to a window, this method does not make sense 14413 location[0] = location[1] = 0; 14414 return; 14415 } 14416 14417 float[] position = mAttachInfo.mTmpTransformLocation; 14418 position[0] = position[1] = 0.0f; 14419 14420 if (!hasIdentityMatrix()) { 14421 getMatrix().mapPoints(position); 14422 } 14423 14424 position[0] += mLeft; 14425 position[1] += mTop; 14426 14427 ViewParent viewParent = mParent; 14428 while (viewParent instanceof View) { 14429 final View view = (View) viewParent; 14430 14431 position[0] -= view.mScrollX; 14432 position[1] -= view.mScrollY; 14433 14434 if (!view.hasIdentityMatrix()) { 14435 view.getMatrix().mapPoints(position); 14436 } 14437 14438 position[0] += view.mLeft; 14439 position[1] += view.mTop; 14440 14441 viewParent = view.mParent; 14442 } 14443 14444 if (viewParent instanceof ViewRootImpl) { 14445 // *cough* 14446 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14447 position[1] -= vr.mCurScrollY; 14448 } 14449 14450 location[0] = (int) (position[0] + 0.5f); 14451 location[1] = (int) (position[1] + 0.5f); 14452 } 14453 14454 /** 14455 * {@hide} 14456 * @param id the id of the view to be found 14457 * @return the view of the specified id, null if cannot be found 14458 */ 14459 protected View findViewTraversal(int id) { 14460 if (id == mID) { 14461 return this; 14462 } 14463 return null; 14464 } 14465 14466 /** 14467 * {@hide} 14468 * @param tag the tag of the view to be found 14469 * @return the view of specified tag, null if cannot be found 14470 */ 14471 protected View findViewWithTagTraversal(Object tag) { 14472 if (tag != null && tag.equals(mTag)) { 14473 return this; 14474 } 14475 return null; 14476 } 14477 14478 /** 14479 * {@hide} 14480 * @param predicate The predicate to evaluate. 14481 * @param childToSkip If not null, ignores this child during the recursive traversal. 14482 * @return The first view that matches the predicate or null. 14483 */ 14484 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14485 if (predicate.apply(this)) { 14486 return this; 14487 } 14488 return null; 14489 } 14490 14491 /** 14492 * Look for a child view with the given id. If this view has the given 14493 * id, return this view. 14494 * 14495 * @param id The id to search for. 14496 * @return The view that has the given id in the hierarchy or null 14497 */ 14498 public final View findViewById(int id) { 14499 if (id < 0) { 14500 return null; 14501 } 14502 return findViewTraversal(id); 14503 } 14504 14505 /** 14506 * Finds a view by its unuque and stable accessibility id. 14507 * 14508 * @param accessibilityId The searched accessibility id. 14509 * @return The found view. 14510 */ 14511 final View findViewByAccessibilityId(int accessibilityId) { 14512 if (accessibilityId < 0) { 14513 return null; 14514 } 14515 return findViewByAccessibilityIdTraversal(accessibilityId); 14516 } 14517 14518 /** 14519 * Performs the traversal to find a view by its unuque and stable accessibility id. 14520 * 14521 * <strong>Note:</strong>This method does not stop at the root namespace 14522 * boundary since the user can touch the screen at an arbitrary location 14523 * potentially crossing the root namespace bounday which will send an 14524 * accessibility event to accessibility services and they should be able 14525 * to obtain the event source. Also accessibility ids are guaranteed to be 14526 * unique in the window. 14527 * 14528 * @param accessibilityId The accessibility id. 14529 * @return The found view. 14530 */ 14531 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14532 if (getAccessibilityViewId() == accessibilityId) { 14533 return this; 14534 } 14535 return null; 14536 } 14537 14538 /** 14539 * Look for a child view with the given tag. If this view has the given 14540 * tag, return this view. 14541 * 14542 * @param tag The tag to search for, using "tag.equals(getTag())". 14543 * @return The View that has the given tag in the hierarchy or null 14544 */ 14545 public final View findViewWithTag(Object tag) { 14546 if (tag == null) { 14547 return null; 14548 } 14549 return findViewWithTagTraversal(tag); 14550 } 14551 14552 /** 14553 * {@hide} 14554 * Look for a child view that matches the specified predicate. 14555 * If this view matches the predicate, return this view. 14556 * 14557 * @param predicate The predicate to evaluate. 14558 * @return The first view that matches the predicate or null. 14559 */ 14560 public final View findViewByPredicate(Predicate<View> predicate) { 14561 return findViewByPredicateTraversal(predicate, null); 14562 } 14563 14564 /** 14565 * {@hide} 14566 * Look for a child view that matches the specified predicate, 14567 * starting with the specified view and its descendents and then 14568 * recusively searching the ancestors and siblings of that view 14569 * until this view is reached. 14570 * 14571 * This method is useful in cases where the predicate does not match 14572 * a single unique view (perhaps multiple views use the same id) 14573 * and we are trying to find the view that is "closest" in scope to the 14574 * starting view. 14575 * 14576 * @param start The view to start from. 14577 * @param predicate The predicate to evaluate. 14578 * @return The first view that matches the predicate or null. 14579 */ 14580 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14581 View childToSkip = null; 14582 for (;;) { 14583 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14584 if (view != null || start == this) { 14585 return view; 14586 } 14587 14588 ViewParent parent = start.getParent(); 14589 if (parent == null || !(parent instanceof View)) { 14590 return null; 14591 } 14592 14593 childToSkip = start; 14594 start = (View) parent; 14595 } 14596 } 14597 14598 /** 14599 * Sets the identifier for this view. The identifier does not have to be 14600 * unique in this view's hierarchy. The identifier should be a positive 14601 * number. 14602 * 14603 * @see #NO_ID 14604 * @see #getId() 14605 * @see #findViewById(int) 14606 * 14607 * @param id a number used to identify the view 14608 * 14609 * @attr ref android.R.styleable#View_id 14610 */ 14611 public void setId(int id) { 14612 mID = id; 14613 } 14614 14615 /** 14616 * {@hide} 14617 * 14618 * @param isRoot true if the view belongs to the root namespace, false 14619 * otherwise 14620 */ 14621 public void setIsRootNamespace(boolean isRoot) { 14622 if (isRoot) { 14623 mPrivateFlags |= IS_ROOT_NAMESPACE; 14624 } else { 14625 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14626 } 14627 } 14628 14629 /** 14630 * {@hide} 14631 * 14632 * @return true if the view belongs to the root namespace, false otherwise 14633 */ 14634 public boolean isRootNamespace() { 14635 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14636 } 14637 14638 /** 14639 * Returns this view's identifier. 14640 * 14641 * @return a positive integer used to identify the view or {@link #NO_ID} 14642 * if the view has no ID 14643 * 14644 * @see #setId(int) 14645 * @see #findViewById(int) 14646 * @attr ref android.R.styleable#View_id 14647 */ 14648 @ViewDebug.CapturedViewProperty 14649 public int getId() { 14650 return mID; 14651 } 14652 14653 /** 14654 * Returns this view's tag. 14655 * 14656 * @return the Object stored in this view as a tag 14657 * 14658 * @see #setTag(Object) 14659 * @see #getTag(int) 14660 */ 14661 @ViewDebug.ExportedProperty 14662 public Object getTag() { 14663 return mTag; 14664 } 14665 14666 /** 14667 * Sets the tag associated with this view. A tag can be used to mark 14668 * a view in its hierarchy and does not have to be unique within the 14669 * hierarchy. Tags can also be used to store data within a view without 14670 * resorting to another data structure. 14671 * 14672 * @param tag an Object to tag the view with 14673 * 14674 * @see #getTag() 14675 * @see #setTag(int, Object) 14676 */ 14677 public void setTag(final Object tag) { 14678 mTag = tag; 14679 } 14680 14681 /** 14682 * Returns the tag associated with this view and the specified key. 14683 * 14684 * @param key The key identifying the tag 14685 * 14686 * @return the Object stored in this view as a tag 14687 * 14688 * @see #setTag(int, Object) 14689 * @see #getTag() 14690 */ 14691 public Object getTag(int key) { 14692 if (mKeyedTags != null) return mKeyedTags.get(key); 14693 return null; 14694 } 14695 14696 /** 14697 * Sets a tag associated with this view and a key. A tag can be used 14698 * to mark a view in its hierarchy and does not have to be unique within 14699 * the hierarchy. Tags can also be used to store data within a view 14700 * without resorting to another data structure. 14701 * 14702 * The specified key should be an id declared in the resources of the 14703 * application to ensure it is unique (see the <a 14704 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14705 * Keys identified as belonging to 14706 * the Android framework or not associated with any package will cause 14707 * an {@link IllegalArgumentException} to be thrown. 14708 * 14709 * @param key The key identifying the tag 14710 * @param tag An Object to tag the view with 14711 * 14712 * @throws IllegalArgumentException If they specified key is not valid 14713 * 14714 * @see #setTag(Object) 14715 * @see #getTag(int) 14716 */ 14717 public void setTag(int key, final Object tag) { 14718 // If the package id is 0x00 or 0x01, it's either an undefined package 14719 // or a framework id 14720 if ((key >>> 24) < 2) { 14721 throw new IllegalArgumentException("The key must be an application-specific " 14722 + "resource id."); 14723 } 14724 14725 setKeyedTag(key, tag); 14726 } 14727 14728 /** 14729 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14730 * framework id. 14731 * 14732 * @hide 14733 */ 14734 public void setTagInternal(int key, Object tag) { 14735 if ((key >>> 24) != 0x1) { 14736 throw new IllegalArgumentException("The key must be a framework-specific " 14737 + "resource id."); 14738 } 14739 14740 setKeyedTag(key, tag); 14741 } 14742 14743 private void setKeyedTag(int key, Object tag) { 14744 if (mKeyedTags == null) { 14745 mKeyedTags = new SparseArray<Object>(); 14746 } 14747 14748 mKeyedTags.put(key, tag); 14749 } 14750 14751 /** 14752 * Prints information about this view in the log output, with the tag 14753 * {@link #VIEW_LOG_TAG}. 14754 * 14755 * @hide 14756 */ 14757 public void debug() { 14758 debug(0); 14759 } 14760 14761 /** 14762 * Prints information about this view in the log output, with the tag 14763 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14764 * indentation defined by the <code>depth</code>. 14765 * 14766 * @param depth the indentation level 14767 * 14768 * @hide 14769 */ 14770 protected void debug(int depth) { 14771 String output = debugIndent(depth - 1); 14772 14773 output += "+ " + this; 14774 int id = getId(); 14775 if (id != -1) { 14776 output += " (id=" + id + ")"; 14777 } 14778 Object tag = getTag(); 14779 if (tag != null) { 14780 output += " (tag=" + tag + ")"; 14781 } 14782 Log.d(VIEW_LOG_TAG, output); 14783 14784 if ((mPrivateFlags & FOCUSED) != 0) { 14785 output = debugIndent(depth) + " FOCUSED"; 14786 Log.d(VIEW_LOG_TAG, output); 14787 } 14788 14789 output = debugIndent(depth); 14790 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14791 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14792 + "} "; 14793 Log.d(VIEW_LOG_TAG, output); 14794 14795 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14796 || mPaddingBottom != 0) { 14797 output = debugIndent(depth); 14798 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14799 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14800 Log.d(VIEW_LOG_TAG, output); 14801 } 14802 14803 output = debugIndent(depth); 14804 output += "mMeasureWidth=" + mMeasuredWidth + 14805 " mMeasureHeight=" + mMeasuredHeight; 14806 Log.d(VIEW_LOG_TAG, output); 14807 14808 output = debugIndent(depth); 14809 if (mLayoutParams == null) { 14810 output += "BAD! no layout params"; 14811 } else { 14812 output = mLayoutParams.debug(output); 14813 } 14814 Log.d(VIEW_LOG_TAG, output); 14815 14816 output = debugIndent(depth); 14817 output += "flags={"; 14818 output += View.printFlags(mViewFlags); 14819 output += "}"; 14820 Log.d(VIEW_LOG_TAG, output); 14821 14822 output = debugIndent(depth); 14823 output += "privateFlags={"; 14824 output += View.printPrivateFlags(mPrivateFlags); 14825 output += "}"; 14826 Log.d(VIEW_LOG_TAG, output); 14827 } 14828 14829 /** 14830 * Creates a string of whitespaces used for indentation. 14831 * 14832 * @param depth the indentation level 14833 * @return a String containing (depth * 2 + 3) * 2 white spaces 14834 * 14835 * @hide 14836 */ 14837 protected static String debugIndent(int depth) { 14838 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14839 for (int i = 0; i < (depth * 2) + 3; i++) { 14840 spaces.append(' ').append(' '); 14841 } 14842 return spaces.toString(); 14843 } 14844 14845 /** 14846 * <p>Return the offset of the widget's text baseline from the widget's top 14847 * boundary. If this widget does not support baseline alignment, this 14848 * method returns -1. </p> 14849 * 14850 * @return the offset of the baseline within the widget's bounds or -1 14851 * if baseline alignment is not supported 14852 */ 14853 @ViewDebug.ExportedProperty(category = "layout") 14854 public int getBaseline() { 14855 return -1; 14856 } 14857 14858 /** 14859 * Call this when something has changed which has invalidated the 14860 * layout of this view. This will schedule a layout pass of the view 14861 * tree. 14862 */ 14863 public void requestLayout() { 14864 mPrivateFlags |= FORCE_LAYOUT; 14865 mPrivateFlags |= INVALIDATED; 14866 14867 if (mLayoutParams != null) { 14868 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14869 } 14870 14871 if (mParent != null && !mParent.isLayoutRequested()) { 14872 mParent.requestLayout(); 14873 } 14874 } 14875 14876 /** 14877 * Forces this view to be laid out during the next layout pass. 14878 * This method does not call requestLayout() or forceLayout() 14879 * on the parent. 14880 */ 14881 public void forceLayout() { 14882 mPrivateFlags |= FORCE_LAYOUT; 14883 mPrivateFlags |= INVALIDATED; 14884 } 14885 14886 /** 14887 * <p> 14888 * This is called to find out how big a view should be. The parent 14889 * supplies constraint information in the width and height parameters. 14890 * </p> 14891 * 14892 * <p> 14893 * The actual measurement work of a view is performed in 14894 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14895 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14896 * </p> 14897 * 14898 * 14899 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14900 * parent 14901 * @param heightMeasureSpec Vertical space requirements as imposed by the 14902 * parent 14903 * 14904 * @see #onMeasure(int, int) 14905 */ 14906 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14907 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14908 widthMeasureSpec != mOldWidthMeasureSpec || 14909 heightMeasureSpec != mOldHeightMeasureSpec) { 14910 14911 // first clears the measured dimension flag 14912 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14913 14914 // measure ourselves, this should set the measured dimension flag back 14915 onMeasure(widthMeasureSpec, heightMeasureSpec); 14916 14917 // flag not set, setMeasuredDimension() was not invoked, we raise 14918 // an exception to warn the developer 14919 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14920 throw new IllegalStateException("onMeasure() did not set the" 14921 + " measured dimension by calling" 14922 + " setMeasuredDimension()"); 14923 } 14924 14925 mPrivateFlags |= LAYOUT_REQUIRED; 14926 } 14927 14928 mOldWidthMeasureSpec = widthMeasureSpec; 14929 mOldHeightMeasureSpec = heightMeasureSpec; 14930 } 14931 14932 /** 14933 * <p> 14934 * Measure the view and its content to determine the measured width and the 14935 * measured height. This method is invoked by {@link #measure(int, int)} and 14936 * should be overriden by subclasses to provide accurate and efficient 14937 * measurement of their contents. 14938 * </p> 14939 * 14940 * <p> 14941 * <strong>CONTRACT:</strong> When overriding this method, you 14942 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14943 * measured width and height of this view. Failure to do so will trigger an 14944 * <code>IllegalStateException</code>, thrown by 14945 * {@link #measure(int, int)}. Calling the superclass' 14946 * {@link #onMeasure(int, int)} is a valid use. 14947 * </p> 14948 * 14949 * <p> 14950 * The base class implementation of measure defaults to the background size, 14951 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14952 * override {@link #onMeasure(int, int)} to provide better measurements of 14953 * their content. 14954 * </p> 14955 * 14956 * <p> 14957 * If this method is overridden, it is the subclass's responsibility to make 14958 * sure the measured height and width are at least the view's minimum height 14959 * and width ({@link #getSuggestedMinimumHeight()} and 14960 * {@link #getSuggestedMinimumWidth()}). 14961 * </p> 14962 * 14963 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14964 * The requirements are encoded with 14965 * {@link android.view.View.MeasureSpec}. 14966 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14967 * The requirements are encoded with 14968 * {@link android.view.View.MeasureSpec}. 14969 * 14970 * @see #getMeasuredWidth() 14971 * @see #getMeasuredHeight() 14972 * @see #setMeasuredDimension(int, int) 14973 * @see #getSuggestedMinimumHeight() 14974 * @see #getSuggestedMinimumWidth() 14975 * @see android.view.View.MeasureSpec#getMode(int) 14976 * @see android.view.View.MeasureSpec#getSize(int) 14977 */ 14978 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 14979 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 14980 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 14981 } 14982 14983 /** 14984 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 14985 * measured width and measured height. Failing to do so will trigger an 14986 * exception at measurement time.</p> 14987 * 14988 * @param measuredWidth The measured width of this view. May be a complex 14989 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14990 * {@link #MEASURED_STATE_TOO_SMALL}. 14991 * @param measuredHeight The measured height of this view. May be a complex 14992 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14993 * {@link #MEASURED_STATE_TOO_SMALL}. 14994 */ 14995 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 14996 mMeasuredWidth = measuredWidth; 14997 mMeasuredHeight = measuredHeight; 14998 14999 mPrivateFlags |= MEASURED_DIMENSION_SET; 15000 } 15001 15002 /** 15003 * Merge two states as returned by {@link #getMeasuredState()}. 15004 * @param curState The current state as returned from a view or the result 15005 * of combining multiple views. 15006 * @param newState The new view state to combine. 15007 * @return Returns a new integer reflecting the combination of the two 15008 * states. 15009 */ 15010 public static int combineMeasuredStates(int curState, int newState) { 15011 return curState | newState; 15012 } 15013 15014 /** 15015 * Version of {@link #resolveSizeAndState(int, int, int)} 15016 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15017 */ 15018 public static int resolveSize(int size, int measureSpec) { 15019 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15020 } 15021 15022 /** 15023 * Utility to reconcile a desired size and state, with constraints imposed 15024 * by a MeasureSpec. Will take the desired size, unless a different size 15025 * is imposed by the constraints. The returned value is a compound integer, 15026 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15027 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15028 * size is smaller than the size the view wants to be. 15029 * 15030 * @param size How big the view wants to be 15031 * @param measureSpec Constraints imposed by the parent 15032 * @return Size information bit mask as defined by 15033 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15034 */ 15035 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15036 int result = size; 15037 int specMode = MeasureSpec.getMode(measureSpec); 15038 int specSize = MeasureSpec.getSize(measureSpec); 15039 switch (specMode) { 15040 case MeasureSpec.UNSPECIFIED: 15041 result = size; 15042 break; 15043 case MeasureSpec.AT_MOST: 15044 if (specSize < size) { 15045 result = specSize | MEASURED_STATE_TOO_SMALL; 15046 } else { 15047 result = size; 15048 } 15049 break; 15050 case MeasureSpec.EXACTLY: 15051 result = specSize; 15052 break; 15053 } 15054 return result | (childMeasuredState&MEASURED_STATE_MASK); 15055 } 15056 15057 /** 15058 * Utility to return a default size. Uses the supplied size if the 15059 * MeasureSpec imposed no constraints. Will get larger if allowed 15060 * by the MeasureSpec. 15061 * 15062 * @param size Default size for this view 15063 * @param measureSpec Constraints imposed by the parent 15064 * @return The size this view should be. 15065 */ 15066 public static int getDefaultSize(int size, int measureSpec) { 15067 int result = size; 15068 int specMode = MeasureSpec.getMode(measureSpec); 15069 int specSize = MeasureSpec.getSize(measureSpec); 15070 15071 switch (specMode) { 15072 case MeasureSpec.UNSPECIFIED: 15073 result = size; 15074 break; 15075 case MeasureSpec.AT_MOST: 15076 case MeasureSpec.EXACTLY: 15077 result = specSize; 15078 break; 15079 } 15080 return result; 15081 } 15082 15083 /** 15084 * Returns the suggested minimum height that the view should use. This 15085 * returns the maximum of the view's minimum height 15086 * and the background's minimum height 15087 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15088 * <p> 15089 * When being used in {@link #onMeasure(int, int)}, the caller should still 15090 * ensure the returned height is within the requirements of the parent. 15091 * 15092 * @return The suggested minimum height of the view. 15093 */ 15094 protected int getSuggestedMinimumHeight() { 15095 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15096 15097 } 15098 15099 /** 15100 * Returns the suggested minimum width that the view should use. This 15101 * returns the maximum of the view's minimum width) 15102 * and the background's minimum width 15103 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15104 * <p> 15105 * When being used in {@link #onMeasure(int, int)}, the caller should still 15106 * ensure the returned width is within the requirements of the parent. 15107 * 15108 * @return The suggested minimum width of the view. 15109 */ 15110 protected int getSuggestedMinimumWidth() { 15111 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15112 } 15113 15114 /** 15115 * Returns the minimum height of the view. 15116 * 15117 * @return the minimum height the view will try to be. 15118 * 15119 * @see #setMinimumHeight(int) 15120 * 15121 * @attr ref android.R.styleable#View_minHeight 15122 */ 15123 public int getMinimumHeight() { 15124 return mMinHeight; 15125 } 15126 15127 /** 15128 * Sets the minimum height of the view. It is not guaranteed the view will 15129 * be able to achieve this minimum height (for example, if its parent layout 15130 * constrains it with less available height). 15131 * 15132 * @param minHeight The minimum height the view will try to be. 15133 * 15134 * @see #getMinimumHeight() 15135 * 15136 * @attr ref android.R.styleable#View_minHeight 15137 */ 15138 public void setMinimumHeight(int minHeight) { 15139 mMinHeight = minHeight; 15140 requestLayout(); 15141 } 15142 15143 /** 15144 * Returns the minimum width of the view. 15145 * 15146 * @return the minimum width the view will try to be. 15147 * 15148 * @see #setMinimumWidth(int) 15149 * 15150 * @attr ref android.R.styleable#View_minWidth 15151 */ 15152 public int getMinimumWidth() { 15153 return mMinWidth; 15154 } 15155 15156 /** 15157 * Sets the minimum width of the view. It is not guaranteed the view will 15158 * be able to achieve this minimum width (for example, if its parent layout 15159 * constrains it with less available width). 15160 * 15161 * @param minWidth The minimum width the view will try to be. 15162 * 15163 * @see #getMinimumWidth() 15164 * 15165 * @attr ref android.R.styleable#View_minWidth 15166 */ 15167 public void setMinimumWidth(int minWidth) { 15168 mMinWidth = minWidth; 15169 requestLayout(); 15170 15171 } 15172 15173 /** 15174 * Get the animation currently associated with this view. 15175 * 15176 * @return The animation that is currently playing or 15177 * scheduled to play for this view. 15178 */ 15179 public Animation getAnimation() { 15180 return mCurrentAnimation; 15181 } 15182 15183 /** 15184 * Start the specified animation now. 15185 * 15186 * @param animation the animation to start now 15187 */ 15188 public void startAnimation(Animation animation) { 15189 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15190 setAnimation(animation); 15191 invalidateParentCaches(); 15192 invalidate(true); 15193 } 15194 15195 /** 15196 * Cancels any animations for this view. 15197 */ 15198 public void clearAnimation() { 15199 if (mCurrentAnimation != null) { 15200 mCurrentAnimation.detach(); 15201 } 15202 mCurrentAnimation = null; 15203 invalidateParentIfNeeded(); 15204 } 15205 15206 /** 15207 * Sets the next animation to play for this view. 15208 * If you want the animation to play immediately, use 15209 * {@link #startAnimation(android.view.animation.Animation)} instead. 15210 * This method provides allows fine-grained 15211 * control over the start time and invalidation, but you 15212 * must make sure that 1) the animation has a start time set, and 15213 * 2) the view's parent (which controls animations on its children) 15214 * will be invalidated when the animation is supposed to 15215 * start. 15216 * 15217 * @param animation The next animation, or null. 15218 */ 15219 public void setAnimation(Animation animation) { 15220 mCurrentAnimation = animation; 15221 15222 if (animation != null) { 15223 // If the screen is off assume the animation start time is now instead of 15224 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15225 // would cause the animation to start when the screen turns back on 15226 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15227 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15228 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15229 } 15230 animation.reset(); 15231 } 15232 } 15233 15234 /** 15235 * Invoked by a parent ViewGroup to notify the start of the animation 15236 * currently associated with this view. If you override this method, 15237 * always call super.onAnimationStart(); 15238 * 15239 * @see #setAnimation(android.view.animation.Animation) 15240 * @see #getAnimation() 15241 */ 15242 protected void onAnimationStart() { 15243 mPrivateFlags |= ANIMATION_STARTED; 15244 } 15245 15246 /** 15247 * Invoked by a parent ViewGroup to notify the end of the animation 15248 * currently associated with this view. If you override this method, 15249 * always call super.onAnimationEnd(); 15250 * 15251 * @see #setAnimation(android.view.animation.Animation) 15252 * @see #getAnimation() 15253 */ 15254 protected void onAnimationEnd() { 15255 mPrivateFlags &= ~ANIMATION_STARTED; 15256 } 15257 15258 /** 15259 * Invoked if there is a Transform that involves alpha. Subclass that can 15260 * draw themselves with the specified alpha should return true, and then 15261 * respect that alpha when their onDraw() is called. If this returns false 15262 * then the view may be redirected to draw into an offscreen buffer to 15263 * fulfill the request, which will look fine, but may be slower than if the 15264 * subclass handles it internally. The default implementation returns false. 15265 * 15266 * @param alpha The alpha (0..255) to apply to the view's drawing 15267 * @return true if the view can draw with the specified alpha. 15268 */ 15269 protected boolean onSetAlpha(int alpha) { 15270 return false; 15271 } 15272 15273 /** 15274 * This is used by the RootView to perform an optimization when 15275 * the view hierarchy contains one or several SurfaceView. 15276 * SurfaceView is always considered transparent, but its children are not, 15277 * therefore all View objects remove themselves from the global transparent 15278 * region (passed as a parameter to this function). 15279 * 15280 * @param region The transparent region for this ViewAncestor (window). 15281 * 15282 * @return Returns true if the effective visibility of the view at this 15283 * point is opaque, regardless of the transparent region; returns false 15284 * if it is possible for underlying windows to be seen behind the view. 15285 * 15286 * {@hide} 15287 */ 15288 public boolean gatherTransparentRegion(Region region) { 15289 final AttachInfo attachInfo = mAttachInfo; 15290 if (region != null && attachInfo != null) { 15291 final int pflags = mPrivateFlags; 15292 if ((pflags & SKIP_DRAW) == 0) { 15293 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15294 // remove it from the transparent region. 15295 final int[] location = attachInfo.mTransparentLocation; 15296 getLocationInWindow(location); 15297 region.op(location[0], location[1], location[0] + mRight - mLeft, 15298 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15299 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15300 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15301 // exists, so we remove the background drawable's non-transparent 15302 // parts from this transparent region. 15303 applyDrawableToTransparentRegion(mBackground, region); 15304 } 15305 } 15306 return true; 15307 } 15308 15309 /** 15310 * Play a sound effect for this view. 15311 * 15312 * <p>The framework will play sound effects for some built in actions, such as 15313 * clicking, but you may wish to play these effects in your widget, 15314 * for instance, for internal navigation. 15315 * 15316 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15317 * {@link #isSoundEffectsEnabled()} is true. 15318 * 15319 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15320 */ 15321 public void playSoundEffect(int soundConstant) { 15322 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15323 return; 15324 } 15325 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15326 } 15327 15328 /** 15329 * BZZZTT!!1! 15330 * 15331 * <p>Provide haptic feedback to the user for this view. 15332 * 15333 * <p>The framework will provide haptic feedback for some built in actions, 15334 * such as long presses, but you may wish to provide feedback for your 15335 * own widget. 15336 * 15337 * <p>The feedback will only be performed if 15338 * {@link #isHapticFeedbackEnabled()} is true. 15339 * 15340 * @param feedbackConstant One of the constants defined in 15341 * {@link HapticFeedbackConstants} 15342 */ 15343 public boolean performHapticFeedback(int feedbackConstant) { 15344 return performHapticFeedback(feedbackConstant, 0); 15345 } 15346 15347 /** 15348 * BZZZTT!!1! 15349 * 15350 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15351 * 15352 * @param feedbackConstant One of the constants defined in 15353 * {@link HapticFeedbackConstants} 15354 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15355 */ 15356 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15357 if (mAttachInfo == null) { 15358 return false; 15359 } 15360 //noinspection SimplifiableIfStatement 15361 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15362 && !isHapticFeedbackEnabled()) { 15363 return false; 15364 } 15365 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15366 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15367 } 15368 15369 /** 15370 * Request that the visibility of the status bar or other screen/window 15371 * decorations be changed. 15372 * 15373 * <p>This method is used to put the over device UI into temporary modes 15374 * where the user's attention is focused more on the application content, 15375 * by dimming or hiding surrounding system affordances. This is typically 15376 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15377 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15378 * to be placed behind the action bar (and with these flags other system 15379 * affordances) so that smooth transitions between hiding and showing them 15380 * can be done. 15381 * 15382 * <p>Two representative examples of the use of system UI visibility is 15383 * implementing a content browsing application (like a magazine reader) 15384 * and a video playing application. 15385 * 15386 * <p>The first code shows a typical implementation of a View in a content 15387 * browsing application. In this implementation, the application goes 15388 * into a content-oriented mode by hiding the status bar and action bar, 15389 * and putting the navigation elements into lights out mode. The user can 15390 * then interact with content while in this mode. Such an application should 15391 * provide an easy way for the user to toggle out of the mode (such as to 15392 * check information in the status bar or access notifications). In the 15393 * implementation here, this is done simply by tapping on the content. 15394 * 15395 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15396 * content} 15397 * 15398 * <p>This second code sample shows a typical implementation of a View 15399 * in a video playing application. In this situation, while the video is 15400 * playing the application would like to go into a complete full-screen mode, 15401 * to use as much of the display as possible for the video. When in this state 15402 * the user can not interact with the application; the system intercepts 15403 * touching on the screen to pop the UI out of full screen mode. See 15404 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15405 * 15406 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15407 * content} 15408 * 15409 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15410 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15411 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15412 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15413 */ 15414 public void setSystemUiVisibility(int visibility) { 15415 if (visibility != mSystemUiVisibility) { 15416 mSystemUiVisibility = visibility; 15417 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15418 mParent.recomputeViewAttributes(this); 15419 } 15420 } 15421 } 15422 15423 /** 15424 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15425 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15426 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15427 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15428 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15429 */ 15430 public int getSystemUiVisibility() { 15431 return mSystemUiVisibility; 15432 } 15433 15434 /** 15435 * Returns the current system UI visibility that is currently set for 15436 * the entire window. This is the combination of the 15437 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15438 * views in the window. 15439 */ 15440 public int getWindowSystemUiVisibility() { 15441 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15442 } 15443 15444 /** 15445 * Override to find out when the window's requested system UI visibility 15446 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15447 * This is different from the callbacks recieved through 15448 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15449 * in that this is only telling you about the local request of the window, 15450 * not the actual values applied by the system. 15451 */ 15452 public void onWindowSystemUiVisibilityChanged(int visible) { 15453 } 15454 15455 /** 15456 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15457 * the view hierarchy. 15458 */ 15459 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15460 onWindowSystemUiVisibilityChanged(visible); 15461 } 15462 15463 /** 15464 * Set a listener to receive callbacks when the visibility of the system bar changes. 15465 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15466 */ 15467 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15468 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15469 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15470 mParent.recomputeViewAttributes(this); 15471 } 15472 } 15473 15474 /** 15475 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15476 * the view hierarchy. 15477 */ 15478 public void dispatchSystemUiVisibilityChanged(int visibility) { 15479 ListenerInfo li = mListenerInfo; 15480 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15481 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15482 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15483 } 15484 } 15485 15486 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15487 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15488 if (val != mSystemUiVisibility) { 15489 setSystemUiVisibility(val); 15490 return true; 15491 } 15492 return false; 15493 } 15494 15495 /** @hide */ 15496 public void setDisabledSystemUiVisibility(int flags) { 15497 if (mAttachInfo != null) { 15498 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15499 mAttachInfo.mDisabledSystemUiVisibility = flags; 15500 if (mParent != null) { 15501 mParent.recomputeViewAttributes(this); 15502 } 15503 } 15504 } 15505 } 15506 15507 /** 15508 * Creates an image that the system displays during the drag and drop 15509 * operation. This is called a "drag shadow". The default implementation 15510 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15511 * appearance as the given View. The default also positions the center of the drag shadow 15512 * directly under the touch point. If no View is provided (the constructor with no parameters 15513 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15514 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15515 * default is an invisible drag shadow. 15516 * <p> 15517 * You are not required to use the View you provide to the constructor as the basis of the 15518 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15519 * anything you want as the drag shadow. 15520 * </p> 15521 * <p> 15522 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15523 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15524 * size and position of the drag shadow. It uses this data to construct a 15525 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15526 * so that your application can draw the shadow image in the Canvas. 15527 * </p> 15528 * 15529 * <div class="special reference"> 15530 * <h3>Developer Guides</h3> 15531 * <p>For a guide to implementing drag and drop features, read the 15532 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15533 * </div> 15534 */ 15535 public static class DragShadowBuilder { 15536 private final WeakReference<View> mView; 15537 15538 /** 15539 * Constructs a shadow image builder based on a View. By default, the resulting drag 15540 * shadow will have the same appearance and dimensions as the View, with the touch point 15541 * over the center of the View. 15542 * @param view A View. Any View in scope can be used. 15543 */ 15544 public DragShadowBuilder(View view) { 15545 mView = new WeakReference<View>(view); 15546 } 15547 15548 /** 15549 * Construct a shadow builder object with no associated View. This 15550 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15551 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15552 * to supply the drag shadow's dimensions and appearance without 15553 * reference to any View object. If they are not overridden, then the result is an 15554 * invisible drag shadow. 15555 */ 15556 public DragShadowBuilder() { 15557 mView = new WeakReference<View>(null); 15558 } 15559 15560 /** 15561 * Returns the View object that had been passed to the 15562 * {@link #View.DragShadowBuilder(View)} 15563 * constructor. If that View parameter was {@code null} or if the 15564 * {@link #View.DragShadowBuilder()} 15565 * constructor was used to instantiate the builder object, this method will return 15566 * null. 15567 * 15568 * @return The View object associate with this builder object. 15569 */ 15570 @SuppressWarnings({"JavadocReference"}) 15571 final public View getView() { 15572 return mView.get(); 15573 } 15574 15575 /** 15576 * Provides the metrics for the shadow image. These include the dimensions of 15577 * the shadow image, and the point within that shadow that should 15578 * be centered under the touch location while dragging. 15579 * <p> 15580 * The default implementation sets the dimensions of the shadow to be the 15581 * same as the dimensions of the View itself and centers the shadow under 15582 * the touch point. 15583 * </p> 15584 * 15585 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15586 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15587 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15588 * image. 15589 * 15590 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15591 * shadow image that should be underneath the touch point during the drag and drop 15592 * operation. Your application must set {@link android.graphics.Point#x} to the 15593 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15594 */ 15595 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15596 final View view = mView.get(); 15597 if (view != null) { 15598 shadowSize.set(view.getWidth(), view.getHeight()); 15599 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15600 } else { 15601 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15602 } 15603 } 15604 15605 /** 15606 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15607 * based on the dimensions it received from the 15608 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15609 * 15610 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15611 */ 15612 public void onDrawShadow(Canvas canvas) { 15613 final View view = mView.get(); 15614 if (view != null) { 15615 view.draw(canvas); 15616 } else { 15617 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15618 } 15619 } 15620 } 15621 15622 /** 15623 * Starts a drag and drop operation. When your application calls this method, it passes a 15624 * {@link android.view.View.DragShadowBuilder} object to the system. The 15625 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15626 * to get metrics for the drag shadow, and then calls the object's 15627 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15628 * <p> 15629 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15630 * drag events to all the View objects in your application that are currently visible. It does 15631 * this either by calling the View object's drag listener (an implementation of 15632 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15633 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15634 * Both are passed a {@link android.view.DragEvent} object that has a 15635 * {@link android.view.DragEvent#getAction()} value of 15636 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15637 * </p> 15638 * <p> 15639 * Your application can invoke startDrag() on any attached View object. The View object does not 15640 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15641 * be related to the View the user selected for dragging. 15642 * </p> 15643 * @param data A {@link android.content.ClipData} object pointing to the data to be 15644 * transferred by the drag and drop operation. 15645 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15646 * drag shadow. 15647 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15648 * drop operation. This Object is put into every DragEvent object sent by the system during the 15649 * current drag. 15650 * <p> 15651 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15652 * to the target Views. For example, it can contain flags that differentiate between a 15653 * a copy operation and a move operation. 15654 * </p> 15655 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15656 * so the parameter should be set to 0. 15657 * @return {@code true} if the method completes successfully, or 15658 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15659 * do a drag, and so no drag operation is in progress. 15660 */ 15661 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15662 Object myLocalState, int flags) { 15663 if (ViewDebug.DEBUG_DRAG) { 15664 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15665 } 15666 boolean okay = false; 15667 15668 Point shadowSize = new Point(); 15669 Point shadowTouchPoint = new Point(); 15670 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15671 15672 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15673 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15674 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15675 } 15676 15677 if (ViewDebug.DEBUG_DRAG) { 15678 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15679 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15680 } 15681 Surface surface = new Surface(); 15682 try { 15683 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15684 flags, shadowSize.x, shadowSize.y, surface); 15685 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15686 + " surface=" + surface); 15687 if (token != null) { 15688 Canvas canvas = surface.lockCanvas(null); 15689 try { 15690 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15691 shadowBuilder.onDrawShadow(canvas); 15692 } finally { 15693 surface.unlockCanvasAndPost(canvas); 15694 } 15695 15696 final ViewRootImpl root = getViewRootImpl(); 15697 15698 // Cache the local state object for delivery with DragEvents 15699 root.setLocalDragState(myLocalState); 15700 15701 // repurpose 'shadowSize' for the last touch point 15702 root.getLastTouchPoint(shadowSize); 15703 15704 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15705 shadowSize.x, shadowSize.y, 15706 shadowTouchPoint.x, shadowTouchPoint.y, data); 15707 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15708 15709 // Off and running! Release our local surface instance; the drag 15710 // shadow surface is now managed by the system process. 15711 surface.release(); 15712 } 15713 } catch (Exception e) { 15714 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15715 surface.destroy(); 15716 } 15717 15718 return okay; 15719 } 15720 15721 /** 15722 * Handles drag events sent by the system following a call to 15723 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15724 *<p> 15725 * When the system calls this method, it passes a 15726 * {@link android.view.DragEvent} object. A call to 15727 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15728 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15729 * operation. 15730 * @param event The {@link android.view.DragEvent} sent by the system. 15731 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15732 * in DragEvent, indicating the type of drag event represented by this object. 15733 * @return {@code true} if the method was successful, otherwise {@code false}. 15734 * <p> 15735 * The method should return {@code true} in response to an action type of 15736 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15737 * operation. 15738 * </p> 15739 * <p> 15740 * The method should also return {@code true} in response to an action type of 15741 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15742 * {@code false} if it didn't. 15743 * </p> 15744 */ 15745 public boolean onDragEvent(DragEvent event) { 15746 return false; 15747 } 15748 15749 /** 15750 * Detects if this View is enabled and has a drag event listener. 15751 * If both are true, then it calls the drag event listener with the 15752 * {@link android.view.DragEvent} it received. If the drag event listener returns 15753 * {@code true}, then dispatchDragEvent() returns {@code true}. 15754 * <p> 15755 * For all other cases, the method calls the 15756 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15757 * method and returns its result. 15758 * </p> 15759 * <p> 15760 * This ensures that a drag event is always consumed, even if the View does not have a drag 15761 * event listener. However, if the View has a listener and the listener returns true, then 15762 * onDragEvent() is not called. 15763 * </p> 15764 */ 15765 public boolean dispatchDragEvent(DragEvent event) { 15766 //noinspection SimplifiableIfStatement 15767 ListenerInfo li = mListenerInfo; 15768 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15769 && li.mOnDragListener.onDrag(this, event)) { 15770 return true; 15771 } 15772 return onDragEvent(event); 15773 } 15774 15775 boolean canAcceptDrag() { 15776 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15777 } 15778 15779 /** 15780 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15781 * it is ever exposed at all. 15782 * @hide 15783 */ 15784 public void onCloseSystemDialogs(String reason) { 15785 } 15786 15787 /** 15788 * Given a Drawable whose bounds have been set to draw into this view, 15789 * update a Region being computed for 15790 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15791 * that any non-transparent parts of the Drawable are removed from the 15792 * given transparent region. 15793 * 15794 * @param dr The Drawable whose transparency is to be applied to the region. 15795 * @param region A Region holding the current transparency information, 15796 * where any parts of the region that are set are considered to be 15797 * transparent. On return, this region will be modified to have the 15798 * transparency information reduced by the corresponding parts of the 15799 * Drawable that are not transparent. 15800 * {@hide} 15801 */ 15802 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15803 if (DBG) { 15804 Log.i("View", "Getting transparent region for: " + this); 15805 } 15806 final Region r = dr.getTransparentRegion(); 15807 final Rect db = dr.getBounds(); 15808 final AttachInfo attachInfo = mAttachInfo; 15809 if (r != null && attachInfo != null) { 15810 final int w = getRight()-getLeft(); 15811 final int h = getBottom()-getTop(); 15812 if (db.left > 0) { 15813 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15814 r.op(0, 0, db.left, h, Region.Op.UNION); 15815 } 15816 if (db.right < w) { 15817 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15818 r.op(db.right, 0, w, h, Region.Op.UNION); 15819 } 15820 if (db.top > 0) { 15821 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15822 r.op(0, 0, w, db.top, Region.Op.UNION); 15823 } 15824 if (db.bottom < h) { 15825 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15826 r.op(0, db.bottom, w, h, Region.Op.UNION); 15827 } 15828 final int[] location = attachInfo.mTransparentLocation; 15829 getLocationInWindow(location); 15830 r.translate(location[0], location[1]); 15831 region.op(r, Region.Op.INTERSECT); 15832 } else { 15833 region.op(db, Region.Op.DIFFERENCE); 15834 } 15835 } 15836 15837 private void checkForLongClick(int delayOffset) { 15838 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15839 mHasPerformedLongPress = false; 15840 15841 if (mPendingCheckForLongPress == null) { 15842 mPendingCheckForLongPress = new CheckForLongPress(); 15843 } 15844 mPendingCheckForLongPress.rememberWindowAttachCount(); 15845 postDelayed(mPendingCheckForLongPress, 15846 ViewConfiguration.getLongPressTimeout() - delayOffset); 15847 } 15848 } 15849 15850 /** 15851 * Inflate a view from an XML resource. This convenience method wraps the {@link 15852 * LayoutInflater} class, which provides a full range of options for view inflation. 15853 * 15854 * @param context The Context object for your activity or application. 15855 * @param resource The resource ID to inflate 15856 * @param root A view group that will be the parent. Used to properly inflate the 15857 * layout_* parameters. 15858 * @see LayoutInflater 15859 */ 15860 public static View inflate(Context context, int resource, ViewGroup root) { 15861 LayoutInflater factory = LayoutInflater.from(context); 15862 return factory.inflate(resource, root); 15863 } 15864 15865 /** 15866 * Scroll the view with standard behavior for scrolling beyond the normal 15867 * content boundaries. Views that call this method should override 15868 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15869 * results of an over-scroll operation. 15870 * 15871 * Views can use this method to handle any touch or fling-based scrolling. 15872 * 15873 * @param deltaX Change in X in pixels 15874 * @param deltaY Change in Y in pixels 15875 * @param scrollX Current X scroll value in pixels before applying deltaX 15876 * @param scrollY Current Y scroll value in pixels before applying deltaY 15877 * @param scrollRangeX Maximum content scroll range along the X axis 15878 * @param scrollRangeY Maximum content scroll range along the Y axis 15879 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15880 * along the X axis. 15881 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15882 * along the Y axis. 15883 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15884 * @return true if scrolling was clamped to an over-scroll boundary along either 15885 * axis, false otherwise. 15886 */ 15887 @SuppressWarnings({"UnusedParameters"}) 15888 protected boolean overScrollBy(int deltaX, int deltaY, 15889 int scrollX, int scrollY, 15890 int scrollRangeX, int scrollRangeY, 15891 int maxOverScrollX, int maxOverScrollY, 15892 boolean isTouchEvent) { 15893 final int overScrollMode = mOverScrollMode; 15894 final boolean canScrollHorizontal = 15895 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15896 final boolean canScrollVertical = 15897 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15898 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15899 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15900 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15901 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15902 15903 int newScrollX = scrollX + deltaX; 15904 if (!overScrollHorizontal) { 15905 maxOverScrollX = 0; 15906 } 15907 15908 int newScrollY = scrollY + deltaY; 15909 if (!overScrollVertical) { 15910 maxOverScrollY = 0; 15911 } 15912 15913 // Clamp values if at the limits and record 15914 final int left = -maxOverScrollX; 15915 final int right = maxOverScrollX + scrollRangeX; 15916 final int top = -maxOverScrollY; 15917 final int bottom = maxOverScrollY + scrollRangeY; 15918 15919 boolean clampedX = false; 15920 if (newScrollX > right) { 15921 newScrollX = right; 15922 clampedX = true; 15923 } else if (newScrollX < left) { 15924 newScrollX = left; 15925 clampedX = true; 15926 } 15927 15928 boolean clampedY = false; 15929 if (newScrollY > bottom) { 15930 newScrollY = bottom; 15931 clampedY = true; 15932 } else if (newScrollY < top) { 15933 newScrollY = top; 15934 clampedY = true; 15935 } 15936 15937 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15938 15939 return clampedX || clampedY; 15940 } 15941 15942 /** 15943 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15944 * respond to the results of an over-scroll operation. 15945 * 15946 * @param scrollX New X scroll value in pixels 15947 * @param scrollY New Y scroll value in pixels 15948 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15949 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15950 */ 15951 protected void onOverScrolled(int scrollX, int scrollY, 15952 boolean clampedX, boolean clampedY) { 15953 // Intentionally empty. 15954 } 15955 15956 /** 15957 * Returns the over-scroll mode for this view. The result will be 15958 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15959 * (allow over-scrolling only if the view content is larger than the container), 15960 * or {@link #OVER_SCROLL_NEVER}. 15961 * 15962 * @return This view's over-scroll mode. 15963 */ 15964 public int getOverScrollMode() { 15965 return mOverScrollMode; 15966 } 15967 15968 /** 15969 * Set the over-scroll mode for this view. Valid over-scroll modes are 15970 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15971 * (allow over-scrolling only if the view content is larger than the container), 15972 * or {@link #OVER_SCROLL_NEVER}. 15973 * 15974 * Setting the over-scroll mode of a view will have an effect only if the 15975 * view is capable of scrolling. 15976 * 15977 * @param overScrollMode The new over-scroll mode for this view. 15978 */ 15979 public void setOverScrollMode(int overScrollMode) { 15980 if (overScrollMode != OVER_SCROLL_ALWAYS && 15981 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 15982 overScrollMode != OVER_SCROLL_NEVER) { 15983 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 15984 } 15985 mOverScrollMode = overScrollMode; 15986 } 15987 15988 /** 15989 * Gets a scale factor that determines the distance the view should scroll 15990 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 15991 * @return The vertical scroll scale factor. 15992 * @hide 15993 */ 15994 protected float getVerticalScrollFactor() { 15995 if (mVerticalScrollFactor == 0) { 15996 TypedValue outValue = new TypedValue(); 15997 if (!mContext.getTheme().resolveAttribute( 15998 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 15999 throw new IllegalStateException( 16000 "Expected theme to define listPreferredItemHeight."); 16001 } 16002 mVerticalScrollFactor = outValue.getDimension( 16003 mContext.getResources().getDisplayMetrics()); 16004 } 16005 return mVerticalScrollFactor; 16006 } 16007 16008 /** 16009 * Gets a scale factor that determines the distance the view should scroll 16010 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16011 * @return The horizontal scroll scale factor. 16012 * @hide 16013 */ 16014 protected float getHorizontalScrollFactor() { 16015 // TODO: Should use something else. 16016 return getVerticalScrollFactor(); 16017 } 16018 16019 /** 16020 * Return the value specifying the text direction or policy that was set with 16021 * {@link #setTextDirection(int)}. 16022 * 16023 * @return the defined text direction. It can be one of: 16024 * 16025 * {@link #TEXT_DIRECTION_INHERIT}, 16026 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16027 * {@link #TEXT_DIRECTION_ANY_RTL}, 16028 * {@link #TEXT_DIRECTION_LTR}, 16029 * {@link #TEXT_DIRECTION_RTL}, 16030 * {@link #TEXT_DIRECTION_LOCALE} 16031 */ 16032 @ViewDebug.ExportedProperty(category = "text", mapping = { 16033 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16034 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16035 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16036 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16037 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16038 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16039 }) 16040 public int getTextDirection() { 16041 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16042 } 16043 16044 /** 16045 * Set the text direction. 16046 * 16047 * @param textDirection the direction to set. Should be one of: 16048 * 16049 * {@link #TEXT_DIRECTION_INHERIT}, 16050 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16051 * {@link #TEXT_DIRECTION_ANY_RTL}, 16052 * {@link #TEXT_DIRECTION_LTR}, 16053 * {@link #TEXT_DIRECTION_RTL}, 16054 * {@link #TEXT_DIRECTION_LOCALE} 16055 */ 16056 public void setTextDirection(int textDirection) { 16057 if (getTextDirection() != textDirection) { 16058 // Reset the current text direction and the resolved one 16059 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16060 resetResolvedTextDirection(); 16061 // Set the new text direction 16062 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16063 // Refresh 16064 requestLayout(); 16065 invalidate(true); 16066 } 16067 } 16068 16069 /** 16070 * Return the resolved text direction. 16071 * 16072 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16073 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16074 * up the parent chain of the view. if there is no parent, then it will return the default 16075 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16076 * 16077 * @return the resolved text direction. Returns one of: 16078 * 16079 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16080 * {@link #TEXT_DIRECTION_ANY_RTL}, 16081 * {@link #TEXT_DIRECTION_LTR}, 16082 * {@link #TEXT_DIRECTION_RTL}, 16083 * {@link #TEXT_DIRECTION_LOCALE} 16084 */ 16085 public int getResolvedTextDirection() { 16086 // The text direction will be resolved only if needed 16087 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16088 resolveTextDirection(); 16089 } 16090 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16091 } 16092 16093 /** 16094 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16095 * resolution is done. 16096 */ 16097 public void resolveTextDirection() { 16098 // Reset any previous text direction resolution 16099 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16100 16101 if (hasRtlSupport()) { 16102 // Set resolved text direction flag depending on text direction flag 16103 final int textDirection = getTextDirection(); 16104 switch(textDirection) { 16105 case TEXT_DIRECTION_INHERIT: 16106 if (canResolveTextDirection()) { 16107 ViewGroup viewGroup = ((ViewGroup) mParent); 16108 16109 // Set current resolved direction to the same value as the parent's one 16110 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16111 switch (parentResolvedDirection) { 16112 case TEXT_DIRECTION_FIRST_STRONG: 16113 case TEXT_DIRECTION_ANY_RTL: 16114 case TEXT_DIRECTION_LTR: 16115 case TEXT_DIRECTION_RTL: 16116 case TEXT_DIRECTION_LOCALE: 16117 mPrivateFlags2 |= 16118 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16119 break; 16120 default: 16121 // Default resolved direction is "first strong" heuristic 16122 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16123 } 16124 } else { 16125 // We cannot do the resolution if there is no parent, so use the default one 16126 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16127 } 16128 break; 16129 case TEXT_DIRECTION_FIRST_STRONG: 16130 case TEXT_DIRECTION_ANY_RTL: 16131 case TEXT_DIRECTION_LTR: 16132 case TEXT_DIRECTION_RTL: 16133 case TEXT_DIRECTION_LOCALE: 16134 // Resolved direction is the same as text direction 16135 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16136 break; 16137 default: 16138 // Default resolved direction is "first strong" heuristic 16139 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16140 } 16141 } else { 16142 // Default resolved direction is "first strong" heuristic 16143 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16144 } 16145 16146 // Set to resolved 16147 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16148 onResolvedTextDirectionChanged(); 16149 } 16150 16151 /** 16152 * Called when text direction has been resolved. Subclasses that care about text direction 16153 * resolution should override this method. 16154 * 16155 * The default implementation does nothing. 16156 */ 16157 public void onResolvedTextDirectionChanged() { 16158 } 16159 16160 /** 16161 * Check if text direction resolution can be done. 16162 * 16163 * @return true if text direction resolution can be done otherwise return false. 16164 */ 16165 public boolean canResolveTextDirection() { 16166 switch (getTextDirection()) { 16167 case TEXT_DIRECTION_INHERIT: 16168 return (mParent != null) && (mParent instanceof ViewGroup); 16169 default: 16170 return true; 16171 } 16172 } 16173 16174 /** 16175 * Reset resolved text direction. Text direction can be resolved with a call to 16176 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16177 * reset is done. 16178 */ 16179 public void resetResolvedTextDirection() { 16180 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16181 onResolvedTextDirectionReset(); 16182 } 16183 16184 /** 16185 * Called when text direction is reset. Subclasses that care about text direction reset should 16186 * override this method and do a reset of the text direction of their children. The default 16187 * implementation does nothing. 16188 */ 16189 public void onResolvedTextDirectionReset() { 16190 } 16191 16192 /** 16193 * Return the value specifying the text alignment or policy that was set with 16194 * {@link #setTextAlignment(int)}. 16195 * 16196 * @return the defined text alignment. It can be one of: 16197 * 16198 * {@link #TEXT_ALIGNMENT_INHERIT}, 16199 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16200 * {@link #TEXT_ALIGNMENT_CENTER}, 16201 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16202 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16203 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16204 * {@link #TEXT_ALIGNMENT_VIEW_END} 16205 */ 16206 @ViewDebug.ExportedProperty(category = "text", mapping = { 16207 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16208 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16209 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16210 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16211 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16212 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16213 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16214 }) 16215 public int getTextAlignment() { 16216 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16217 } 16218 16219 /** 16220 * Set the text alignment. 16221 * 16222 * @param textAlignment The text alignment to set. Should be one of 16223 * 16224 * {@link #TEXT_ALIGNMENT_INHERIT}, 16225 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16226 * {@link #TEXT_ALIGNMENT_CENTER}, 16227 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16228 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16229 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16230 * {@link #TEXT_ALIGNMENT_VIEW_END} 16231 * 16232 * @attr ref android.R.styleable#View_textAlignment 16233 */ 16234 public void setTextAlignment(int textAlignment) { 16235 if (textAlignment != getTextAlignment()) { 16236 // Reset the current and resolved text alignment 16237 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16238 resetResolvedTextAlignment(); 16239 // Set the new text alignment 16240 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16241 // Refresh 16242 requestLayout(); 16243 invalidate(true); 16244 } 16245 } 16246 16247 /** 16248 * Return the resolved text alignment. 16249 * 16250 * The resolved text alignment. This needs resolution if the value is 16251 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16252 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16253 * 16254 * @return the resolved text alignment. Returns one of: 16255 * 16256 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16257 * {@link #TEXT_ALIGNMENT_CENTER}, 16258 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16259 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16260 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16261 * {@link #TEXT_ALIGNMENT_VIEW_END} 16262 */ 16263 @ViewDebug.ExportedProperty(category = "text", mapping = { 16264 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16265 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16266 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16267 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16268 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16269 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16270 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16271 }) 16272 public int getResolvedTextAlignment() { 16273 // If text alignment is not resolved, then resolve it 16274 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16275 resolveTextAlignment(); 16276 } 16277 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16278 } 16279 16280 /** 16281 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16282 * resolution is done. 16283 */ 16284 public void resolveTextAlignment() { 16285 // Reset any previous text alignment resolution 16286 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16287 16288 if (hasRtlSupport()) { 16289 // Set resolved text alignment flag depending on text alignment flag 16290 final int textAlignment = getTextAlignment(); 16291 switch (textAlignment) { 16292 case TEXT_ALIGNMENT_INHERIT: 16293 // Check if we can resolve the text alignment 16294 if (canResolveLayoutDirection() && mParent instanceof View) { 16295 View view = (View) mParent; 16296 16297 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16298 switch (parentResolvedTextAlignment) { 16299 case TEXT_ALIGNMENT_GRAVITY: 16300 case TEXT_ALIGNMENT_TEXT_START: 16301 case TEXT_ALIGNMENT_TEXT_END: 16302 case TEXT_ALIGNMENT_CENTER: 16303 case TEXT_ALIGNMENT_VIEW_START: 16304 case TEXT_ALIGNMENT_VIEW_END: 16305 // Resolved text alignment is the same as the parent resolved 16306 // text alignment 16307 mPrivateFlags2 |= 16308 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16309 break; 16310 default: 16311 // Use default resolved text alignment 16312 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16313 } 16314 } 16315 else { 16316 // We cannot do the resolution if there is no parent so use the default 16317 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16318 } 16319 break; 16320 case TEXT_ALIGNMENT_GRAVITY: 16321 case TEXT_ALIGNMENT_TEXT_START: 16322 case TEXT_ALIGNMENT_TEXT_END: 16323 case TEXT_ALIGNMENT_CENTER: 16324 case TEXT_ALIGNMENT_VIEW_START: 16325 case TEXT_ALIGNMENT_VIEW_END: 16326 // Resolved text alignment is the same as text alignment 16327 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16328 break; 16329 default: 16330 // Use default resolved text alignment 16331 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16332 } 16333 } else { 16334 // Use default resolved text alignment 16335 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16336 } 16337 16338 // Set the resolved 16339 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16340 onResolvedTextAlignmentChanged(); 16341 } 16342 16343 /** 16344 * Check if text alignment resolution can be done. 16345 * 16346 * @return true if text alignment resolution can be done otherwise return false. 16347 */ 16348 public boolean canResolveTextAlignment() { 16349 switch (getTextAlignment()) { 16350 case TEXT_DIRECTION_INHERIT: 16351 return (mParent != null); 16352 default: 16353 return true; 16354 } 16355 } 16356 16357 /** 16358 * Called when text alignment has been resolved. Subclasses that care about text alignment 16359 * resolution should override this method. 16360 * 16361 * The default implementation does nothing. 16362 */ 16363 public void onResolvedTextAlignmentChanged() { 16364 } 16365 16366 /** 16367 * Reset resolved text alignment. Text alignment can be resolved with a call to 16368 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16369 * reset is done. 16370 */ 16371 public void resetResolvedTextAlignment() { 16372 // Reset any previous text alignment resolution 16373 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16374 onResolvedTextAlignmentReset(); 16375 } 16376 16377 /** 16378 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16379 * override this method and do a reset of the text alignment of their children. The default 16380 * implementation does nothing. 16381 */ 16382 public void onResolvedTextAlignmentReset() { 16383 } 16384 16385 // 16386 // Properties 16387 // 16388 /** 16389 * A Property wrapper around the <code>alpha</code> functionality handled by the 16390 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16391 */ 16392 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16393 @Override 16394 public void setValue(View object, float value) { 16395 object.setAlpha(value); 16396 } 16397 16398 @Override 16399 public Float get(View object) { 16400 return object.getAlpha(); 16401 } 16402 }; 16403 16404 /** 16405 * A Property wrapper around the <code>translationX</code> functionality handled by the 16406 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16407 */ 16408 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16409 @Override 16410 public void setValue(View object, float value) { 16411 object.setTranslationX(value); 16412 } 16413 16414 @Override 16415 public Float get(View object) { 16416 return object.getTranslationX(); 16417 } 16418 }; 16419 16420 /** 16421 * A Property wrapper around the <code>translationY</code> functionality handled by the 16422 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16423 */ 16424 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16425 @Override 16426 public void setValue(View object, float value) { 16427 object.setTranslationY(value); 16428 } 16429 16430 @Override 16431 public Float get(View object) { 16432 return object.getTranslationY(); 16433 } 16434 }; 16435 16436 /** 16437 * A Property wrapper around the <code>x</code> functionality handled by the 16438 * {@link View#setX(float)} and {@link View#getX()} methods. 16439 */ 16440 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16441 @Override 16442 public void setValue(View object, float value) { 16443 object.setX(value); 16444 } 16445 16446 @Override 16447 public Float get(View object) { 16448 return object.getX(); 16449 } 16450 }; 16451 16452 /** 16453 * A Property wrapper around the <code>y</code> functionality handled by the 16454 * {@link View#setY(float)} and {@link View#getY()} methods. 16455 */ 16456 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16457 @Override 16458 public void setValue(View object, float value) { 16459 object.setY(value); 16460 } 16461 16462 @Override 16463 public Float get(View object) { 16464 return object.getY(); 16465 } 16466 }; 16467 16468 /** 16469 * A Property wrapper around the <code>rotation</code> functionality handled by the 16470 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16471 */ 16472 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16473 @Override 16474 public void setValue(View object, float value) { 16475 object.setRotation(value); 16476 } 16477 16478 @Override 16479 public Float get(View object) { 16480 return object.getRotation(); 16481 } 16482 }; 16483 16484 /** 16485 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16486 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16487 */ 16488 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16489 @Override 16490 public void setValue(View object, float value) { 16491 object.setRotationX(value); 16492 } 16493 16494 @Override 16495 public Float get(View object) { 16496 return object.getRotationX(); 16497 } 16498 }; 16499 16500 /** 16501 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16502 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16503 */ 16504 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16505 @Override 16506 public void setValue(View object, float value) { 16507 object.setRotationY(value); 16508 } 16509 16510 @Override 16511 public Float get(View object) { 16512 return object.getRotationY(); 16513 } 16514 }; 16515 16516 /** 16517 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16518 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16519 */ 16520 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16521 @Override 16522 public void setValue(View object, float value) { 16523 object.setScaleX(value); 16524 } 16525 16526 @Override 16527 public Float get(View object) { 16528 return object.getScaleX(); 16529 } 16530 }; 16531 16532 /** 16533 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16534 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16535 */ 16536 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16537 @Override 16538 public void setValue(View object, float value) { 16539 object.setScaleY(value); 16540 } 16541 16542 @Override 16543 public Float get(View object) { 16544 return object.getScaleY(); 16545 } 16546 }; 16547 16548 /** 16549 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16550 * Each MeasureSpec represents a requirement for either the width or the height. 16551 * A MeasureSpec is comprised of a size and a mode. There are three possible 16552 * modes: 16553 * <dl> 16554 * <dt>UNSPECIFIED</dt> 16555 * <dd> 16556 * The parent has not imposed any constraint on the child. It can be whatever size 16557 * it wants. 16558 * </dd> 16559 * 16560 * <dt>EXACTLY</dt> 16561 * <dd> 16562 * The parent has determined an exact size for the child. The child is going to be 16563 * given those bounds regardless of how big it wants to be. 16564 * </dd> 16565 * 16566 * <dt>AT_MOST</dt> 16567 * <dd> 16568 * The child can be as large as it wants up to the specified size. 16569 * </dd> 16570 * </dl> 16571 * 16572 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16573 * is provided to pack and unpack the <size, mode> tuple into the int. 16574 */ 16575 public static class MeasureSpec { 16576 private static final int MODE_SHIFT = 30; 16577 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16578 16579 /** 16580 * Measure specification mode: The parent has not imposed any constraint 16581 * on the child. It can be whatever size it wants. 16582 */ 16583 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16584 16585 /** 16586 * Measure specification mode: The parent has determined an exact size 16587 * for the child. The child is going to be given those bounds regardless 16588 * of how big it wants to be. 16589 */ 16590 public static final int EXACTLY = 1 << MODE_SHIFT; 16591 16592 /** 16593 * Measure specification mode: The child can be as large as it wants up 16594 * to the specified size. 16595 */ 16596 public static final int AT_MOST = 2 << MODE_SHIFT; 16597 16598 /** 16599 * Creates a measure specification based on the supplied size and mode. 16600 * 16601 * The mode must always be one of the following: 16602 * <ul> 16603 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16604 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16605 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16606 * </ul> 16607 * 16608 * @param size the size of the measure specification 16609 * @param mode the mode of the measure specification 16610 * @return the measure specification based on size and mode 16611 */ 16612 public static int makeMeasureSpec(int size, int mode) { 16613 return size + mode; 16614 } 16615 16616 /** 16617 * Extracts the mode from the supplied measure specification. 16618 * 16619 * @param measureSpec the measure specification to extract the mode from 16620 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16621 * {@link android.view.View.MeasureSpec#AT_MOST} or 16622 * {@link android.view.View.MeasureSpec#EXACTLY} 16623 */ 16624 public static int getMode(int measureSpec) { 16625 return (measureSpec & MODE_MASK); 16626 } 16627 16628 /** 16629 * Extracts the size from the supplied measure specification. 16630 * 16631 * @param measureSpec the measure specification to extract the size from 16632 * @return the size in pixels defined in the supplied measure specification 16633 */ 16634 public static int getSize(int measureSpec) { 16635 return (measureSpec & ~MODE_MASK); 16636 } 16637 16638 /** 16639 * Returns a String representation of the specified measure 16640 * specification. 16641 * 16642 * @param measureSpec the measure specification to convert to a String 16643 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16644 */ 16645 public static String toString(int measureSpec) { 16646 int mode = getMode(measureSpec); 16647 int size = getSize(measureSpec); 16648 16649 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16650 16651 if (mode == UNSPECIFIED) 16652 sb.append("UNSPECIFIED "); 16653 else if (mode == EXACTLY) 16654 sb.append("EXACTLY "); 16655 else if (mode == AT_MOST) 16656 sb.append("AT_MOST "); 16657 else 16658 sb.append(mode).append(" "); 16659 16660 sb.append(size); 16661 return sb.toString(); 16662 } 16663 } 16664 16665 class CheckForLongPress implements Runnable { 16666 16667 private int mOriginalWindowAttachCount; 16668 16669 public void run() { 16670 if (isPressed() && (mParent != null) 16671 && mOriginalWindowAttachCount == mWindowAttachCount) { 16672 if (performLongClick()) { 16673 mHasPerformedLongPress = true; 16674 } 16675 } 16676 } 16677 16678 public void rememberWindowAttachCount() { 16679 mOriginalWindowAttachCount = mWindowAttachCount; 16680 } 16681 } 16682 16683 private final class CheckForTap implements Runnable { 16684 public void run() { 16685 mPrivateFlags &= ~PREPRESSED; 16686 setPressed(true); 16687 checkForLongClick(ViewConfiguration.getTapTimeout()); 16688 } 16689 } 16690 16691 private final class PerformClick implements Runnable { 16692 public void run() { 16693 performClick(); 16694 } 16695 } 16696 16697 /** @hide */ 16698 public void hackTurnOffWindowResizeAnim(boolean off) { 16699 mAttachInfo.mTurnOffWindowResizeAnim = off; 16700 } 16701 16702 /** 16703 * This method returns a ViewPropertyAnimator object, which can be used to animate 16704 * specific properties on this View. 16705 * 16706 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16707 */ 16708 public ViewPropertyAnimator animate() { 16709 if (mAnimator == null) { 16710 mAnimator = new ViewPropertyAnimator(this); 16711 } 16712 return mAnimator; 16713 } 16714 16715 /** 16716 * Interface definition for a callback to be invoked when a key event is 16717 * dispatched to this view. The callback will be invoked before the key 16718 * event is given to the view. 16719 */ 16720 public interface OnKeyListener { 16721 /** 16722 * Called when a key is dispatched to a view. This allows listeners to 16723 * get a chance to respond before the target view. 16724 * 16725 * @param v The view the key has been dispatched to. 16726 * @param keyCode The code for the physical key that was pressed 16727 * @param event The KeyEvent object containing full information about 16728 * the event. 16729 * @return True if the listener has consumed the event, false otherwise. 16730 */ 16731 boolean onKey(View v, int keyCode, KeyEvent event); 16732 } 16733 16734 /** 16735 * Interface definition for a callback to be invoked when a touch event is 16736 * dispatched to this view. The callback will be invoked before the touch 16737 * event is given to the view. 16738 */ 16739 public interface OnTouchListener { 16740 /** 16741 * Called when a touch event is dispatched to a view. This allows listeners to 16742 * get a chance to respond before the target view. 16743 * 16744 * @param v The view the touch event has been dispatched to. 16745 * @param event The MotionEvent object containing full information about 16746 * the event. 16747 * @return True if the listener has consumed the event, false otherwise. 16748 */ 16749 boolean onTouch(View v, MotionEvent event); 16750 } 16751 16752 /** 16753 * Interface definition for a callback to be invoked when a hover event is 16754 * dispatched to this view. The callback will be invoked before the hover 16755 * event is given to the view. 16756 */ 16757 public interface OnHoverListener { 16758 /** 16759 * Called when a hover event is dispatched to a view. This allows listeners to 16760 * get a chance to respond before the target view. 16761 * 16762 * @param v The view the hover event has been dispatched to. 16763 * @param event The MotionEvent object containing full information about 16764 * the event. 16765 * @return True if the listener has consumed the event, false otherwise. 16766 */ 16767 boolean onHover(View v, MotionEvent event); 16768 } 16769 16770 /** 16771 * Interface definition for a callback to be invoked when a generic motion event is 16772 * dispatched to this view. The callback will be invoked before the generic motion 16773 * event is given to the view. 16774 */ 16775 public interface OnGenericMotionListener { 16776 /** 16777 * Called when a generic motion event is dispatched to a view. This allows listeners to 16778 * get a chance to respond before the target view. 16779 * 16780 * @param v The view the generic motion event has been dispatched to. 16781 * @param event The MotionEvent object containing full information about 16782 * the event. 16783 * @return True if the listener has consumed the event, false otherwise. 16784 */ 16785 boolean onGenericMotion(View v, MotionEvent event); 16786 } 16787 16788 /** 16789 * Interface definition for a callback to be invoked when a view has been clicked and held. 16790 */ 16791 public interface OnLongClickListener { 16792 /** 16793 * Called when a view has been clicked and held. 16794 * 16795 * @param v The view that was clicked and held. 16796 * 16797 * @return true if the callback consumed the long click, false otherwise. 16798 */ 16799 boolean onLongClick(View v); 16800 } 16801 16802 /** 16803 * Interface definition for a callback to be invoked when a drag is being dispatched 16804 * to this view. The callback will be invoked before the hosting view's own 16805 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16806 * onDrag(event) behavior, it should return 'false' from this callback. 16807 * 16808 * <div class="special reference"> 16809 * <h3>Developer Guides</h3> 16810 * <p>For a guide to implementing drag and drop features, read the 16811 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16812 * </div> 16813 */ 16814 public interface OnDragListener { 16815 /** 16816 * Called when a drag event is dispatched to a view. This allows listeners 16817 * to get a chance to override base View behavior. 16818 * 16819 * @param v The View that received the drag event. 16820 * @param event The {@link android.view.DragEvent} object for the drag event. 16821 * @return {@code true} if the drag event was handled successfully, or {@code false} 16822 * if the drag event was not handled. Note that {@code false} will trigger the View 16823 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16824 */ 16825 boolean onDrag(View v, DragEvent event); 16826 } 16827 16828 /** 16829 * Interface definition for a callback to be invoked when the focus state of 16830 * a view changed. 16831 */ 16832 public interface OnFocusChangeListener { 16833 /** 16834 * Called when the focus state of a view has changed. 16835 * 16836 * @param v The view whose state has changed. 16837 * @param hasFocus The new focus state of v. 16838 */ 16839 void onFocusChange(View v, boolean hasFocus); 16840 } 16841 16842 /** 16843 * Interface definition for a callback to be invoked when a view is clicked. 16844 */ 16845 public interface OnClickListener { 16846 /** 16847 * Called when a view has been clicked. 16848 * 16849 * @param v The view that was clicked. 16850 */ 16851 void onClick(View v); 16852 } 16853 16854 /** 16855 * Interface definition for a callback to be invoked when the context menu 16856 * for this view is being built. 16857 */ 16858 public interface OnCreateContextMenuListener { 16859 /** 16860 * Called when the context menu for this view is being built. It is not 16861 * safe to hold onto the menu after this method returns. 16862 * 16863 * @param menu The context menu that is being built 16864 * @param v The view for which the context menu is being built 16865 * @param menuInfo Extra information about the item for which the 16866 * context menu should be shown. This information will vary 16867 * depending on the class of v. 16868 */ 16869 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16870 } 16871 16872 /** 16873 * Interface definition for a callback to be invoked when the status bar changes 16874 * visibility. This reports <strong>global</strong> changes to the system UI 16875 * state, not what the application is requesting. 16876 * 16877 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16878 */ 16879 public interface OnSystemUiVisibilityChangeListener { 16880 /** 16881 * Called when the status bar changes visibility because of a call to 16882 * {@link View#setSystemUiVisibility(int)}. 16883 * 16884 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16885 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16886 * This tells you the <strong>global</strong> state of these UI visibility 16887 * flags, not what your app is currently applying. 16888 */ 16889 public void onSystemUiVisibilityChange(int visibility); 16890 } 16891 16892 /** 16893 * Interface definition for a callback to be invoked when this view is attached 16894 * or detached from its window. 16895 */ 16896 public interface OnAttachStateChangeListener { 16897 /** 16898 * Called when the view is attached to a window. 16899 * @param v The view that was attached 16900 */ 16901 public void onViewAttachedToWindow(View v); 16902 /** 16903 * Called when the view is detached from a window. 16904 * @param v The view that was detached 16905 */ 16906 public void onViewDetachedFromWindow(View v); 16907 } 16908 16909 private final class UnsetPressedState implements Runnable { 16910 public void run() { 16911 setPressed(false); 16912 } 16913 } 16914 16915 /** 16916 * Base class for derived classes that want to save and restore their own 16917 * state in {@link android.view.View#onSaveInstanceState()}. 16918 */ 16919 public static class BaseSavedState extends AbsSavedState { 16920 /** 16921 * Constructor used when reading from a parcel. Reads the state of the superclass. 16922 * 16923 * @param source 16924 */ 16925 public BaseSavedState(Parcel source) { 16926 super(source); 16927 } 16928 16929 /** 16930 * Constructor called by derived classes when creating their SavedState objects 16931 * 16932 * @param superState The state of the superclass of this view 16933 */ 16934 public BaseSavedState(Parcelable superState) { 16935 super(superState); 16936 } 16937 16938 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16939 new Parcelable.Creator<BaseSavedState>() { 16940 public BaseSavedState createFromParcel(Parcel in) { 16941 return new BaseSavedState(in); 16942 } 16943 16944 public BaseSavedState[] newArray(int size) { 16945 return new BaseSavedState[size]; 16946 } 16947 }; 16948 } 16949 16950 /** 16951 * A set of information given to a view when it is attached to its parent 16952 * window. 16953 */ 16954 static class AttachInfo { 16955 interface Callbacks { 16956 void playSoundEffect(int effectId); 16957 boolean performHapticFeedback(int effectId, boolean always); 16958 } 16959 16960 /** 16961 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 16962 * to a Handler. This class contains the target (View) to invalidate and 16963 * the coordinates of the dirty rectangle. 16964 * 16965 * For performance purposes, this class also implements a pool of up to 16966 * POOL_LIMIT objects that get reused. This reduces memory allocations 16967 * whenever possible. 16968 */ 16969 static class InvalidateInfo implements Poolable<InvalidateInfo> { 16970 private static final int POOL_LIMIT = 10; 16971 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 16972 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 16973 public InvalidateInfo newInstance() { 16974 return new InvalidateInfo(); 16975 } 16976 16977 public void onAcquired(InvalidateInfo element) { 16978 } 16979 16980 public void onReleased(InvalidateInfo element) { 16981 element.target = null; 16982 } 16983 }, POOL_LIMIT) 16984 ); 16985 16986 private InvalidateInfo mNext; 16987 private boolean mIsPooled; 16988 16989 View target; 16990 16991 int left; 16992 int top; 16993 int right; 16994 int bottom; 16995 16996 public void setNextPoolable(InvalidateInfo element) { 16997 mNext = element; 16998 } 16999 17000 public InvalidateInfo getNextPoolable() { 17001 return mNext; 17002 } 17003 17004 static InvalidateInfo acquire() { 17005 return sPool.acquire(); 17006 } 17007 17008 void release() { 17009 sPool.release(this); 17010 } 17011 17012 public boolean isPooled() { 17013 return mIsPooled; 17014 } 17015 17016 public void setPooled(boolean isPooled) { 17017 mIsPooled = isPooled; 17018 } 17019 } 17020 17021 final IWindowSession mSession; 17022 17023 final IWindow mWindow; 17024 17025 final IBinder mWindowToken; 17026 17027 final Callbacks mRootCallbacks; 17028 17029 HardwareCanvas mHardwareCanvas; 17030 17031 /** 17032 * The top view of the hierarchy. 17033 */ 17034 View mRootView; 17035 17036 IBinder mPanelParentWindowToken; 17037 Surface mSurface; 17038 17039 boolean mHardwareAccelerated; 17040 boolean mHardwareAccelerationRequested; 17041 HardwareRenderer mHardwareRenderer; 17042 17043 boolean mScreenOn; 17044 17045 /** 17046 * Scale factor used by the compatibility mode 17047 */ 17048 float mApplicationScale; 17049 17050 /** 17051 * Indicates whether the application is in compatibility mode 17052 */ 17053 boolean mScalingRequired; 17054 17055 /** 17056 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17057 */ 17058 boolean mTurnOffWindowResizeAnim; 17059 17060 /** 17061 * Left position of this view's window 17062 */ 17063 int mWindowLeft; 17064 17065 /** 17066 * Top position of this view's window 17067 */ 17068 int mWindowTop; 17069 17070 /** 17071 * Indicates whether views need to use 32-bit drawing caches 17072 */ 17073 boolean mUse32BitDrawingCache; 17074 17075 /** 17076 * For windows that are full-screen but using insets to layout inside 17077 * of the screen decorations, these are the current insets for the 17078 * content of the window. 17079 */ 17080 final Rect mContentInsets = new Rect(); 17081 17082 /** 17083 * For windows that are full-screen but using insets to layout inside 17084 * of the screen decorations, these are the current insets for the 17085 * actual visible parts of the window. 17086 */ 17087 final Rect mVisibleInsets = new Rect(); 17088 17089 /** 17090 * The internal insets given by this window. This value is 17091 * supplied by the client (through 17092 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17093 * be given to the window manager when changed to be used in laying 17094 * out windows behind it. 17095 */ 17096 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17097 = new ViewTreeObserver.InternalInsetsInfo(); 17098 17099 /** 17100 * All views in the window's hierarchy that serve as scroll containers, 17101 * used to determine if the window can be resized or must be panned 17102 * to adjust for a soft input area. 17103 */ 17104 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17105 17106 final KeyEvent.DispatcherState mKeyDispatchState 17107 = new KeyEvent.DispatcherState(); 17108 17109 /** 17110 * Indicates whether the view's window currently has the focus. 17111 */ 17112 boolean mHasWindowFocus; 17113 17114 /** 17115 * The current visibility of the window. 17116 */ 17117 int mWindowVisibility; 17118 17119 /** 17120 * Indicates the time at which drawing started to occur. 17121 */ 17122 long mDrawingTime; 17123 17124 /** 17125 * Indicates whether or not ignoring the DIRTY_MASK flags. 17126 */ 17127 boolean mIgnoreDirtyState; 17128 17129 /** 17130 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17131 * to avoid clearing that flag prematurely. 17132 */ 17133 boolean mSetIgnoreDirtyState = false; 17134 17135 /** 17136 * Indicates whether the view's window is currently in touch mode. 17137 */ 17138 boolean mInTouchMode; 17139 17140 /** 17141 * Indicates that ViewAncestor should trigger a global layout change 17142 * the next time it performs a traversal 17143 */ 17144 boolean mRecomputeGlobalAttributes; 17145 17146 /** 17147 * Always report new attributes at next traversal. 17148 */ 17149 boolean mForceReportNewAttributes; 17150 17151 /** 17152 * Set during a traveral if any views want to keep the screen on. 17153 */ 17154 boolean mKeepScreenOn; 17155 17156 /** 17157 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17158 */ 17159 int mSystemUiVisibility; 17160 17161 /** 17162 * Hack to force certain system UI visibility flags to be cleared. 17163 */ 17164 int mDisabledSystemUiVisibility; 17165 17166 /** 17167 * Last global system UI visibility reported by the window manager. 17168 */ 17169 int mGlobalSystemUiVisibility; 17170 17171 /** 17172 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17173 * attached. 17174 */ 17175 boolean mHasSystemUiListeners; 17176 17177 /** 17178 * Set if the visibility of any views has changed. 17179 */ 17180 boolean mViewVisibilityChanged; 17181 17182 /** 17183 * Set to true if a view has been scrolled. 17184 */ 17185 boolean mViewScrollChanged; 17186 17187 /** 17188 * Global to the view hierarchy used as a temporary for dealing with 17189 * x/y points in the transparent region computations. 17190 */ 17191 final int[] mTransparentLocation = new int[2]; 17192 17193 /** 17194 * Global to the view hierarchy used as a temporary for dealing with 17195 * x/y points in the ViewGroup.invalidateChild implementation. 17196 */ 17197 final int[] mInvalidateChildLocation = new int[2]; 17198 17199 17200 /** 17201 * Global to the view hierarchy used as a temporary for dealing with 17202 * x/y location when view is transformed. 17203 */ 17204 final float[] mTmpTransformLocation = new float[2]; 17205 17206 /** 17207 * The view tree observer used to dispatch global events like 17208 * layout, pre-draw, touch mode change, etc. 17209 */ 17210 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17211 17212 /** 17213 * A Canvas used by the view hierarchy to perform bitmap caching. 17214 */ 17215 Canvas mCanvas; 17216 17217 /** 17218 * The view root impl. 17219 */ 17220 final ViewRootImpl mViewRootImpl; 17221 17222 /** 17223 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17224 * handler can be used to pump events in the UI events queue. 17225 */ 17226 final Handler mHandler; 17227 17228 /** 17229 * Temporary for use in computing invalidate rectangles while 17230 * calling up the hierarchy. 17231 */ 17232 final Rect mTmpInvalRect = new Rect(); 17233 17234 /** 17235 * Temporary for use in computing hit areas with transformed views 17236 */ 17237 final RectF mTmpTransformRect = new RectF(); 17238 17239 /** 17240 * Temporary list for use in collecting focusable descendents of a view. 17241 */ 17242 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17243 17244 /** 17245 * The id of the window for accessibility purposes. 17246 */ 17247 int mAccessibilityWindowId = View.NO_ID; 17248 17249 /** 17250 * Whether to ingore not exposed for accessibility Views when 17251 * reporting the view tree to accessibility services. 17252 */ 17253 boolean mIncludeNotImportantViews; 17254 17255 /** 17256 * The drawable for highlighting accessibility focus. 17257 */ 17258 Drawable mAccessibilityFocusDrawable; 17259 17260 /** 17261 * Show where the margins, bounds and layout bounds are for each view. 17262 */ 17263 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17264 17265 /** 17266 * Point used to compute visible regions. 17267 */ 17268 final Point mPoint = new Point(); 17269 17270 /** 17271 * Creates a new set of attachment information with the specified 17272 * events handler and thread. 17273 * 17274 * @param handler the events handler the view must use 17275 */ 17276 AttachInfo(IWindowSession session, IWindow window, 17277 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17278 mSession = session; 17279 mWindow = window; 17280 mWindowToken = window.asBinder(); 17281 mViewRootImpl = viewRootImpl; 17282 mHandler = handler; 17283 mRootCallbacks = effectPlayer; 17284 } 17285 } 17286 17287 /** 17288 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17289 * is supported. This avoids keeping too many unused fields in most 17290 * instances of View.</p> 17291 */ 17292 private static class ScrollabilityCache implements Runnable { 17293 17294 /** 17295 * Scrollbars are not visible 17296 */ 17297 public static final int OFF = 0; 17298 17299 /** 17300 * Scrollbars are visible 17301 */ 17302 public static final int ON = 1; 17303 17304 /** 17305 * Scrollbars are fading away 17306 */ 17307 public static final int FADING = 2; 17308 17309 public boolean fadeScrollBars; 17310 17311 public int fadingEdgeLength; 17312 public int scrollBarDefaultDelayBeforeFade; 17313 public int scrollBarFadeDuration; 17314 17315 public int scrollBarSize; 17316 public ScrollBarDrawable scrollBar; 17317 public float[] interpolatorValues; 17318 public View host; 17319 17320 public final Paint paint; 17321 public final Matrix matrix; 17322 public Shader shader; 17323 17324 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17325 17326 private static final float[] OPAQUE = { 255 }; 17327 private static final float[] TRANSPARENT = { 0.0f }; 17328 17329 /** 17330 * When fading should start. This time moves into the future every time 17331 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17332 */ 17333 public long fadeStartTime; 17334 17335 17336 /** 17337 * The current state of the scrollbars: ON, OFF, or FADING 17338 */ 17339 public int state = OFF; 17340 17341 private int mLastColor; 17342 17343 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17344 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17345 scrollBarSize = configuration.getScaledScrollBarSize(); 17346 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17347 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17348 17349 paint = new Paint(); 17350 matrix = new Matrix(); 17351 // use use a height of 1, and then wack the matrix each time we 17352 // actually use it. 17353 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17354 17355 paint.setShader(shader); 17356 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17357 this.host = host; 17358 } 17359 17360 public void setFadeColor(int color) { 17361 if (color != 0 && color != mLastColor) { 17362 mLastColor = color; 17363 color |= 0xFF000000; 17364 17365 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17366 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17367 17368 paint.setShader(shader); 17369 // Restore the default transfer mode (src_over) 17370 paint.setXfermode(null); 17371 } 17372 } 17373 17374 public void run() { 17375 long now = AnimationUtils.currentAnimationTimeMillis(); 17376 if (now >= fadeStartTime) { 17377 17378 // the animation fades the scrollbars out by changing 17379 // the opacity (alpha) from fully opaque to fully 17380 // transparent 17381 int nextFrame = (int) now; 17382 int framesCount = 0; 17383 17384 Interpolator interpolator = scrollBarInterpolator; 17385 17386 // Start opaque 17387 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17388 17389 // End transparent 17390 nextFrame += scrollBarFadeDuration; 17391 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17392 17393 state = FADING; 17394 17395 // Kick off the fade animation 17396 host.invalidate(true); 17397 } 17398 } 17399 } 17400 17401 /** 17402 * Resuable callback for sending 17403 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17404 */ 17405 private class SendViewScrolledAccessibilityEvent implements Runnable { 17406 public volatile boolean mIsPending; 17407 17408 public void run() { 17409 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17410 mIsPending = false; 17411 } 17412 } 17413 17414 /** 17415 * <p> 17416 * This class represents a delegate that can be registered in a {@link View} 17417 * to enhance accessibility support via composition rather via inheritance. 17418 * It is specifically targeted to widget developers that extend basic View 17419 * classes i.e. classes in package android.view, that would like their 17420 * applications to be backwards compatible. 17421 * </p> 17422 * <div class="special reference"> 17423 * <h3>Developer Guides</h3> 17424 * <p>For more information about making applications accessible, read the 17425 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17426 * developer guide.</p> 17427 * </div> 17428 * <p> 17429 * A scenario in which a developer would like to use an accessibility delegate 17430 * is overriding a method introduced in a later API version then the minimal API 17431 * version supported by the application. For example, the method 17432 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17433 * in API version 4 when the accessibility APIs were first introduced. If a 17434 * developer would like his application to run on API version 4 devices (assuming 17435 * all other APIs used by the application are version 4 or lower) and take advantage 17436 * of this method, instead of overriding the method which would break the application's 17437 * backwards compatibility, he can override the corresponding method in this 17438 * delegate and register the delegate in the target View if the API version of 17439 * the system is high enough i.e. the API version is same or higher to the API 17440 * version that introduced 17441 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17442 * </p> 17443 * <p> 17444 * Here is an example implementation: 17445 * </p> 17446 * <code><pre><p> 17447 * if (Build.VERSION.SDK_INT >= 14) { 17448 * // If the API version is equal of higher than the version in 17449 * // which onInitializeAccessibilityNodeInfo was introduced we 17450 * // register a delegate with a customized implementation. 17451 * View view = findViewById(R.id.view_id); 17452 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17453 * public void onInitializeAccessibilityNodeInfo(View host, 17454 * AccessibilityNodeInfo info) { 17455 * // Let the default implementation populate the info. 17456 * super.onInitializeAccessibilityNodeInfo(host, info); 17457 * // Set some other information. 17458 * info.setEnabled(host.isEnabled()); 17459 * } 17460 * }); 17461 * } 17462 * </code></pre></p> 17463 * <p> 17464 * This delegate contains methods that correspond to the accessibility methods 17465 * in View. If a delegate has been specified the implementation in View hands 17466 * off handling to the corresponding method in this delegate. The default 17467 * implementation the delegate methods behaves exactly as the corresponding 17468 * method in View for the case of no accessibility delegate been set. Hence, 17469 * to customize the behavior of a View method, clients can override only the 17470 * corresponding delegate method without altering the behavior of the rest 17471 * accessibility related methods of the host view. 17472 * </p> 17473 */ 17474 public static class AccessibilityDelegate { 17475 17476 /** 17477 * Sends an accessibility event of the given type. If accessibility is not 17478 * enabled this method has no effect. 17479 * <p> 17480 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17481 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17482 * been set. 17483 * </p> 17484 * 17485 * @param host The View hosting the delegate. 17486 * @param eventType The type of the event to send. 17487 * 17488 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17489 */ 17490 public void sendAccessibilityEvent(View host, int eventType) { 17491 host.sendAccessibilityEventInternal(eventType); 17492 } 17493 17494 /** 17495 * Performs the specified accessibility action on the view. For 17496 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17497 * <p> 17498 * The default implementation behaves as 17499 * {@link View#performAccessibilityAction(int, Bundle) 17500 * View#performAccessibilityAction(int, Bundle)} for the case of 17501 * no accessibility delegate been set. 17502 * </p> 17503 * 17504 * @param action The action to perform. 17505 * @return Whether the action was performed. 17506 * 17507 * @see View#performAccessibilityAction(int, Bundle) 17508 * View#performAccessibilityAction(int, Bundle) 17509 */ 17510 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17511 return host.performAccessibilityActionInternal(action, args); 17512 } 17513 17514 /** 17515 * Sends an accessibility event. This method behaves exactly as 17516 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17517 * empty {@link AccessibilityEvent} and does not perform a check whether 17518 * accessibility is enabled. 17519 * <p> 17520 * The default implementation behaves as 17521 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17522 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17523 * the case of no accessibility delegate been set. 17524 * </p> 17525 * 17526 * @param host The View hosting the delegate. 17527 * @param event The event to send. 17528 * 17529 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17530 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17531 */ 17532 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17533 host.sendAccessibilityEventUncheckedInternal(event); 17534 } 17535 17536 /** 17537 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17538 * to its children for adding their text content to the event. 17539 * <p> 17540 * The default implementation behaves as 17541 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17542 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17543 * the case of no accessibility delegate been set. 17544 * </p> 17545 * 17546 * @param host The View hosting the delegate. 17547 * @param event The event. 17548 * @return True if the event population was completed. 17549 * 17550 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17551 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17552 */ 17553 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17554 return host.dispatchPopulateAccessibilityEventInternal(event); 17555 } 17556 17557 /** 17558 * Gives a chance to the host View to populate the accessibility event with its 17559 * text content. 17560 * <p> 17561 * The default implementation behaves as 17562 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17563 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17564 * the case of no accessibility delegate been set. 17565 * </p> 17566 * 17567 * @param host The View hosting the delegate. 17568 * @param event The accessibility event which to populate. 17569 * 17570 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17571 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17572 */ 17573 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17574 host.onPopulateAccessibilityEventInternal(event); 17575 } 17576 17577 /** 17578 * Initializes an {@link AccessibilityEvent} with information about the 17579 * the host View which is the event source. 17580 * <p> 17581 * The default implementation behaves as 17582 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17583 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17584 * the case of no accessibility delegate been set. 17585 * </p> 17586 * 17587 * @param host The View hosting the delegate. 17588 * @param event The event to initialize. 17589 * 17590 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17591 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17592 */ 17593 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17594 host.onInitializeAccessibilityEventInternal(event); 17595 } 17596 17597 /** 17598 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17599 * <p> 17600 * The default implementation behaves as 17601 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17602 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17603 * the case of no accessibility delegate been set. 17604 * </p> 17605 * 17606 * @param host The View hosting the delegate. 17607 * @param info The instance to initialize. 17608 * 17609 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17610 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17611 */ 17612 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17613 host.onInitializeAccessibilityNodeInfoInternal(info); 17614 } 17615 17616 /** 17617 * Called when a child of the host View has requested sending an 17618 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17619 * to augment the event. 17620 * <p> 17621 * The default implementation behaves as 17622 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17623 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17624 * the case of no accessibility delegate been set. 17625 * </p> 17626 * 17627 * @param host The View hosting the delegate. 17628 * @param child The child which requests sending the event. 17629 * @param event The event to be sent. 17630 * @return True if the event should be sent 17631 * 17632 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17633 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17634 */ 17635 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17636 AccessibilityEvent event) { 17637 return host.onRequestSendAccessibilityEventInternal(child, event); 17638 } 17639 17640 /** 17641 * Gets the provider for managing a virtual view hierarchy rooted at this View 17642 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17643 * that explore the window content. 17644 * <p> 17645 * The default implementation behaves as 17646 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17647 * the case of no accessibility delegate been set. 17648 * </p> 17649 * 17650 * @return The provider. 17651 * 17652 * @see AccessibilityNodeProvider 17653 */ 17654 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17655 return null; 17656 } 17657 } 17658} 17659