View.java revision da350b9ef3095ec64a262758e595d5c6e039efd2
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 continue state. In practice this means with any of system bar, 2244 * nav bar, and status bar shown, but not the space that would be needed 2245 * for an input method. 2246 * 2247 * <p>If you are using ActionBar in 2248 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2249 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2250 * insets it adds to those given to the application. 2251 */ 2252 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2253 2254 /** 2255 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2256 * to be layed out as if it has requested 2257 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2258 * allows it to avoid artifacts when switching in and out of that mode, at 2259 * the expense that some of its user interface may be covered by screen 2260 * decorations when they are shown. You can perform layout of your inner 2261 * UI elements to account for the navagation system UI through the 2262 * {@link #fitSystemWindows(Rect)} method. 2263 */ 2264 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2265 2266 /** 2267 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2268 * to be layed out as if it has requested 2269 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2270 * allows it to avoid artifacts when switching in and out of that mode, at 2271 * the expense that some of its user interface may be covered by screen 2272 * decorations when they are shown. You can perform layout of your inner 2273 * UI elements to account for non-fullscreen system UI through the 2274 * {@link #fitSystemWindows(Rect)} method. 2275 */ 2276 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2277 2278 /** 2279 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2280 */ 2281 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2282 2283 /** 2284 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2285 */ 2286 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2287 2288 /** 2289 * @hide 2290 * 2291 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2292 * out of the public fields to keep the undefined bits out of the developer's way. 2293 * 2294 * Flag to make the status bar not expandable. Unless you also 2295 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2296 */ 2297 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2298 2299 /** 2300 * @hide 2301 * 2302 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2303 * out of the public fields to keep the undefined bits out of the developer's way. 2304 * 2305 * Flag to hide notification icons and scrolling ticker text. 2306 */ 2307 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2308 2309 /** 2310 * @hide 2311 * 2312 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2313 * out of the public fields to keep the undefined bits out of the developer's way. 2314 * 2315 * Flag to disable incoming notification alerts. This will not block 2316 * icons, but it will block sound, vibrating and other visual or aural notifications. 2317 */ 2318 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2319 2320 /** 2321 * @hide 2322 * 2323 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2324 * out of the public fields to keep the undefined bits out of the developer's way. 2325 * 2326 * Flag to hide only the scrolling ticker. Note that 2327 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2328 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2329 */ 2330 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2331 2332 /** 2333 * @hide 2334 * 2335 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2336 * out of the public fields to keep the undefined bits out of the developer's way. 2337 * 2338 * Flag to hide the center system info area. 2339 */ 2340 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2341 2342 /** 2343 * @hide 2344 * 2345 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2346 * out of the public fields to keep the undefined bits out of the developer's way. 2347 * 2348 * Flag to hide only the home button. Don't use this 2349 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2350 */ 2351 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2352 2353 /** 2354 * @hide 2355 * 2356 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2357 * out of the public fields to keep the undefined bits out of the developer's way. 2358 * 2359 * Flag to hide only the back button. Don't use this 2360 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2361 */ 2362 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2363 2364 /** 2365 * @hide 2366 * 2367 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2368 * out of the public fields to keep the undefined bits out of the developer's way. 2369 * 2370 * Flag to hide only the clock. You might use this if your activity has 2371 * its own clock making the status bar's clock redundant. 2372 */ 2373 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2374 2375 /** 2376 * @hide 2377 * 2378 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2379 * out of the public fields to keep the undefined bits out of the developer's way. 2380 * 2381 * Flag to hide only the recent apps button. Don't use this 2382 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2383 */ 2384 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2385 2386 /** 2387 * @hide 2388 */ 2389 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2390 2391 /** 2392 * These are the system UI flags that can be cleared by events outside 2393 * of an application. Currently this is just the ability to tap on the 2394 * screen while hiding the navigation bar to have it return. 2395 * @hide 2396 */ 2397 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2398 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2399 | SYSTEM_UI_FLAG_FULLSCREEN; 2400 2401 /** 2402 * Flags that can impact the layout in relation to system UI. 2403 */ 2404 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2405 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2406 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2407 2408 /** 2409 * Find views that render the specified text. 2410 * 2411 * @see #findViewsWithText(ArrayList, CharSequence, int) 2412 */ 2413 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2414 2415 /** 2416 * Find find views that contain the specified content description. 2417 * 2418 * @see #findViewsWithText(ArrayList, CharSequence, int) 2419 */ 2420 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2421 2422 /** 2423 * Find views that contain {@link AccessibilityNodeProvider}. Such 2424 * a View is a root of virtual view hierarchy and may contain the searched 2425 * text. If this flag is set Views with providers are automatically 2426 * added and it is a responsibility of the client to call the APIs of 2427 * the provider to determine whether the virtual tree rooted at this View 2428 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2429 * represeting the virtual views with this text. 2430 * 2431 * @see #findViewsWithText(ArrayList, CharSequence, int) 2432 * 2433 * @hide 2434 */ 2435 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2436 2437 /** 2438 * Indicates that the screen has changed state and is now off. 2439 * 2440 * @see #onScreenStateChanged(int) 2441 */ 2442 public static final int SCREEN_STATE_OFF = 0x0; 2443 2444 /** 2445 * Indicates that the screen has changed state and is now on. 2446 * 2447 * @see #onScreenStateChanged(int) 2448 */ 2449 public static final int SCREEN_STATE_ON = 0x1; 2450 2451 /** 2452 * Controls the over-scroll mode for this view. 2453 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2454 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2455 * and {@link #OVER_SCROLL_NEVER}. 2456 */ 2457 private int mOverScrollMode; 2458 2459 /** 2460 * The parent this view is attached to. 2461 * {@hide} 2462 * 2463 * @see #getParent() 2464 */ 2465 protected ViewParent mParent; 2466 2467 /** 2468 * {@hide} 2469 */ 2470 AttachInfo mAttachInfo; 2471 2472 /** 2473 * {@hide} 2474 */ 2475 @ViewDebug.ExportedProperty(flagMapping = { 2476 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2477 name = "FORCE_LAYOUT"), 2478 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2479 name = "LAYOUT_REQUIRED"), 2480 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2481 name = "DRAWING_CACHE_INVALID", outputIf = false), 2482 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2483 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2484 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2485 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2486 }) 2487 int mPrivateFlags; 2488 int mPrivateFlags2; 2489 2490 /** 2491 * This view's request for the visibility of the status bar. 2492 * @hide 2493 */ 2494 @ViewDebug.ExportedProperty(flagMapping = { 2495 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2496 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2497 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2498 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2499 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2500 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2501 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2502 equals = SYSTEM_UI_FLAG_VISIBLE, 2503 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2504 }) 2505 int mSystemUiVisibility; 2506 2507 /** 2508 * Reference count for transient state. 2509 * @see #setHasTransientState(boolean) 2510 */ 2511 int mTransientStateCount = 0; 2512 2513 /** 2514 * Count of how many windows this view has been attached to. 2515 */ 2516 int mWindowAttachCount; 2517 2518 /** 2519 * The layout parameters associated with this view and used by the parent 2520 * {@link android.view.ViewGroup} to determine how this view should be 2521 * laid out. 2522 * {@hide} 2523 */ 2524 protected ViewGroup.LayoutParams mLayoutParams; 2525 2526 /** 2527 * The view flags hold various views states. 2528 * {@hide} 2529 */ 2530 @ViewDebug.ExportedProperty 2531 int mViewFlags; 2532 2533 static class TransformationInfo { 2534 /** 2535 * The transform matrix for the View. This transform is calculated internally 2536 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2537 * is used by default. Do *not* use this variable directly; instead call 2538 * getMatrix(), which will automatically recalculate the matrix if necessary 2539 * to get the correct matrix based on the latest rotation and scale properties. 2540 */ 2541 private final Matrix mMatrix = new Matrix(); 2542 2543 /** 2544 * The transform matrix for the View. This transform is calculated internally 2545 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2546 * is used by default. Do *not* use this variable directly; instead call 2547 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2548 * to get the correct matrix based on the latest rotation and scale properties. 2549 */ 2550 private Matrix mInverseMatrix; 2551 2552 /** 2553 * An internal variable that tracks whether we need to recalculate the 2554 * transform matrix, based on whether the rotation or scaleX/Y properties 2555 * have changed since the matrix was last calculated. 2556 */ 2557 boolean mMatrixDirty = false; 2558 2559 /** 2560 * An internal variable that tracks whether we need to recalculate the 2561 * transform matrix, based on whether the rotation or scaleX/Y properties 2562 * have changed since the matrix was last calculated. 2563 */ 2564 private boolean mInverseMatrixDirty = true; 2565 2566 /** 2567 * A variable that tracks whether we need to recalculate the 2568 * transform matrix, based on whether the rotation or scaleX/Y properties 2569 * have changed since the matrix was last calculated. This variable 2570 * is only valid after a call to updateMatrix() or to a function that 2571 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2572 */ 2573 private boolean mMatrixIsIdentity = true; 2574 2575 /** 2576 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2577 */ 2578 private Camera mCamera = null; 2579 2580 /** 2581 * This matrix is used when computing the matrix for 3D rotations. 2582 */ 2583 private Matrix matrix3D = null; 2584 2585 /** 2586 * These prev values are used to recalculate a centered pivot point when necessary. The 2587 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2588 * set), so thes values are only used then as well. 2589 */ 2590 private int mPrevWidth = -1; 2591 private int mPrevHeight = -1; 2592 2593 /** 2594 * The degrees rotation around the vertical axis through the pivot point. 2595 */ 2596 @ViewDebug.ExportedProperty 2597 float mRotationY = 0f; 2598 2599 /** 2600 * The degrees rotation around the horizontal axis through the pivot point. 2601 */ 2602 @ViewDebug.ExportedProperty 2603 float mRotationX = 0f; 2604 2605 /** 2606 * The degrees rotation around the pivot point. 2607 */ 2608 @ViewDebug.ExportedProperty 2609 float mRotation = 0f; 2610 2611 /** 2612 * The amount of translation of the object away from its left property (post-layout). 2613 */ 2614 @ViewDebug.ExportedProperty 2615 float mTranslationX = 0f; 2616 2617 /** 2618 * The amount of translation of the object away from its top property (post-layout). 2619 */ 2620 @ViewDebug.ExportedProperty 2621 float mTranslationY = 0f; 2622 2623 /** 2624 * The amount of scale in the x direction around the pivot point. A 2625 * value of 1 means no scaling is applied. 2626 */ 2627 @ViewDebug.ExportedProperty 2628 float mScaleX = 1f; 2629 2630 /** 2631 * The amount of scale in the y direction around the pivot point. A 2632 * value of 1 means no scaling is applied. 2633 */ 2634 @ViewDebug.ExportedProperty 2635 float mScaleY = 1f; 2636 2637 /** 2638 * The x location of the point around which the view is rotated and scaled. 2639 */ 2640 @ViewDebug.ExportedProperty 2641 float mPivotX = 0f; 2642 2643 /** 2644 * The y location of the point around which the view is rotated and scaled. 2645 */ 2646 @ViewDebug.ExportedProperty 2647 float mPivotY = 0f; 2648 2649 /** 2650 * The opacity of the View. This is a value from 0 to 1, where 0 means 2651 * completely transparent and 1 means completely opaque. 2652 */ 2653 @ViewDebug.ExportedProperty 2654 float mAlpha = 1f; 2655 } 2656 2657 TransformationInfo mTransformationInfo; 2658 2659 private boolean mLastIsOpaque; 2660 2661 /** 2662 * Convenience value to check for float values that are close enough to zero to be considered 2663 * zero. 2664 */ 2665 private static final float NONZERO_EPSILON = .001f; 2666 2667 /** 2668 * The distance in pixels from the left edge of this view's parent 2669 * to the left edge of this view. 2670 * {@hide} 2671 */ 2672 @ViewDebug.ExportedProperty(category = "layout") 2673 protected int mLeft; 2674 /** 2675 * The distance in pixels from the left edge of this view's parent 2676 * to the right edge of this view. 2677 * {@hide} 2678 */ 2679 @ViewDebug.ExportedProperty(category = "layout") 2680 protected int mRight; 2681 /** 2682 * The distance in pixels from the top edge of this view's parent 2683 * to the top edge of this view. 2684 * {@hide} 2685 */ 2686 @ViewDebug.ExportedProperty(category = "layout") 2687 protected int mTop; 2688 /** 2689 * The distance in pixels from the top edge of this view's parent 2690 * to the bottom edge of this view. 2691 * {@hide} 2692 */ 2693 @ViewDebug.ExportedProperty(category = "layout") 2694 protected int mBottom; 2695 2696 /** 2697 * The offset, in pixels, by which the content of this view is scrolled 2698 * horizontally. 2699 * {@hide} 2700 */ 2701 @ViewDebug.ExportedProperty(category = "scrolling") 2702 protected int mScrollX; 2703 /** 2704 * The offset, in pixels, by which the content of this view is scrolled 2705 * vertically. 2706 * {@hide} 2707 */ 2708 @ViewDebug.ExportedProperty(category = "scrolling") 2709 protected int mScrollY; 2710 2711 /** 2712 * The left padding in pixels, that is the distance in pixels between the 2713 * left edge of this view and the left edge of its content. 2714 * {@hide} 2715 */ 2716 @ViewDebug.ExportedProperty(category = "padding") 2717 protected int mPaddingLeft; 2718 /** 2719 * The right padding in pixels, that is the distance in pixels between the 2720 * right edge of this view and the right edge of its content. 2721 * {@hide} 2722 */ 2723 @ViewDebug.ExportedProperty(category = "padding") 2724 protected int mPaddingRight; 2725 /** 2726 * The top padding in pixels, that is the distance in pixels between the 2727 * top edge of this view and the top edge of its content. 2728 * {@hide} 2729 */ 2730 @ViewDebug.ExportedProperty(category = "padding") 2731 protected int mPaddingTop; 2732 /** 2733 * The bottom padding in pixels, that is the distance in pixels between the 2734 * bottom edge of this view and the bottom edge of its content. 2735 * {@hide} 2736 */ 2737 @ViewDebug.ExportedProperty(category = "padding") 2738 protected int mPaddingBottom; 2739 2740 /** 2741 * The layout insets in pixels, that is the distance in pixels between the 2742 * visible edges of this view its bounds. 2743 */ 2744 private Insets mLayoutInsets; 2745 2746 /** 2747 * Briefly describes the view and is primarily used for accessibility support. 2748 */ 2749 private CharSequence mContentDescription; 2750 2751 /** 2752 * Cache the paddingRight set by the user to append to the scrollbar's size. 2753 * 2754 * @hide 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 protected int mUserPaddingRight; 2758 2759 /** 2760 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2761 * 2762 * @hide 2763 */ 2764 @ViewDebug.ExportedProperty(category = "padding") 2765 protected int mUserPaddingBottom; 2766 2767 /** 2768 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2769 * 2770 * @hide 2771 */ 2772 @ViewDebug.ExportedProperty(category = "padding") 2773 protected int mUserPaddingLeft; 2774 2775 /** 2776 * Cache if the user padding is relative. 2777 * 2778 */ 2779 @ViewDebug.ExportedProperty(category = "padding") 2780 boolean mUserPaddingRelative; 2781 2782 /** 2783 * Cache the paddingStart set by the user to append to the scrollbar's size. 2784 * 2785 */ 2786 @ViewDebug.ExportedProperty(category = "padding") 2787 int mUserPaddingStart; 2788 2789 /** 2790 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2791 * 2792 */ 2793 @ViewDebug.ExportedProperty(category = "padding") 2794 int mUserPaddingEnd; 2795 2796 /** 2797 * @hide 2798 */ 2799 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2800 /** 2801 * @hide 2802 */ 2803 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2804 2805 private Drawable mBackground; 2806 2807 private int mBackgroundResource; 2808 private boolean mBackgroundSizeChanged; 2809 2810 static class ListenerInfo { 2811 /** 2812 * Listener used to dispatch focus change events. 2813 * This field should be made private, so it is hidden from the SDK. 2814 * {@hide} 2815 */ 2816 protected OnFocusChangeListener mOnFocusChangeListener; 2817 2818 /** 2819 * Listeners for layout change events. 2820 */ 2821 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2822 2823 /** 2824 * Listeners for attach events. 2825 */ 2826 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2827 2828 /** 2829 * Listener used to dispatch click events. 2830 * This field should be made private, so it is hidden from the SDK. 2831 * {@hide} 2832 */ 2833 public OnClickListener mOnClickListener; 2834 2835 /** 2836 * Listener used to dispatch long click events. 2837 * This field should be made private, so it is hidden from the SDK. 2838 * {@hide} 2839 */ 2840 protected OnLongClickListener mOnLongClickListener; 2841 2842 /** 2843 * Listener used to build the context menu. 2844 * This field should be made private, so it is hidden from the SDK. 2845 * {@hide} 2846 */ 2847 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2848 2849 private OnKeyListener mOnKeyListener; 2850 2851 private OnTouchListener mOnTouchListener; 2852 2853 private OnHoverListener mOnHoverListener; 2854 2855 private OnGenericMotionListener mOnGenericMotionListener; 2856 2857 private OnDragListener mOnDragListener; 2858 2859 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2860 } 2861 2862 ListenerInfo mListenerInfo; 2863 2864 /** 2865 * The application environment this view lives in. 2866 * This field should be made private, so it is hidden from the SDK. 2867 * {@hide} 2868 */ 2869 protected Context mContext; 2870 2871 private final Resources mResources; 2872 2873 private ScrollabilityCache mScrollCache; 2874 2875 private int[] mDrawableState = null; 2876 2877 /** 2878 * Set to true when drawing cache is enabled and cannot be created. 2879 * 2880 * @hide 2881 */ 2882 public boolean mCachingFailed; 2883 2884 private Bitmap mDrawingCache; 2885 private Bitmap mUnscaledDrawingCache; 2886 private HardwareLayer mHardwareLayer; 2887 DisplayList mDisplayList; 2888 2889 /** 2890 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2891 * the user may specify which view to go to next. 2892 */ 2893 private int mNextFocusLeftId = View.NO_ID; 2894 2895 /** 2896 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2897 * the user may specify which view to go to next. 2898 */ 2899 private int mNextFocusRightId = View.NO_ID; 2900 2901 /** 2902 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2903 * the user may specify which view to go to next. 2904 */ 2905 private int mNextFocusUpId = View.NO_ID; 2906 2907 /** 2908 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2909 * the user may specify which view to go to next. 2910 */ 2911 private int mNextFocusDownId = View.NO_ID; 2912 2913 /** 2914 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2915 * the user may specify which view to go to next. 2916 */ 2917 int mNextFocusForwardId = View.NO_ID; 2918 2919 private CheckForLongPress mPendingCheckForLongPress; 2920 private CheckForTap mPendingCheckForTap = null; 2921 private PerformClick mPerformClick; 2922 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2923 2924 private UnsetPressedState mUnsetPressedState; 2925 2926 /** 2927 * Whether the long press's action has been invoked. The tap's action is invoked on the 2928 * up event while a long press is invoked as soon as the long press duration is reached, so 2929 * a long press could be performed before the tap is checked, in which case the tap's action 2930 * should not be invoked. 2931 */ 2932 private boolean mHasPerformedLongPress; 2933 2934 /** 2935 * The minimum height of the view. We'll try our best to have the height 2936 * of this view to at least this amount. 2937 */ 2938 @ViewDebug.ExportedProperty(category = "measurement") 2939 private int mMinHeight; 2940 2941 /** 2942 * The minimum width of the view. We'll try our best to have the width 2943 * of this view to at least this amount. 2944 */ 2945 @ViewDebug.ExportedProperty(category = "measurement") 2946 private int mMinWidth; 2947 2948 /** 2949 * The delegate to handle touch events that are physically in this view 2950 * but should be handled by another view. 2951 */ 2952 private TouchDelegate mTouchDelegate = null; 2953 2954 /** 2955 * Solid color to use as a background when creating the drawing cache. Enables 2956 * the cache to use 16 bit bitmaps instead of 32 bit. 2957 */ 2958 private int mDrawingCacheBackgroundColor = 0; 2959 2960 /** 2961 * Special tree observer used when mAttachInfo is null. 2962 */ 2963 private ViewTreeObserver mFloatingTreeObserver; 2964 2965 /** 2966 * Cache the touch slop from the context that created the view. 2967 */ 2968 private int mTouchSlop; 2969 2970 /** 2971 * Object that handles automatic animation of view properties. 2972 */ 2973 private ViewPropertyAnimator mAnimator = null; 2974 2975 /** 2976 * Flag indicating that a drag can cross window boundaries. When 2977 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2978 * with this flag set, all visible applications will be able to participate 2979 * in the drag operation and receive the dragged content. 2980 * 2981 * @hide 2982 */ 2983 public static final int DRAG_FLAG_GLOBAL = 1; 2984 2985 /** 2986 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2987 */ 2988 private float mVerticalScrollFactor; 2989 2990 /** 2991 * Position of the vertical scroll bar. 2992 */ 2993 private int mVerticalScrollbarPosition; 2994 2995 /** 2996 * Position the scroll bar at the default position as determined by the system. 2997 */ 2998 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2999 3000 /** 3001 * Position the scroll bar along the left edge. 3002 */ 3003 public static final int SCROLLBAR_POSITION_LEFT = 1; 3004 3005 /** 3006 * Position the scroll bar along the right edge. 3007 */ 3008 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3009 3010 /** 3011 * Indicates that the view does not have a layer. 3012 * 3013 * @see #getLayerType() 3014 * @see #setLayerType(int, android.graphics.Paint) 3015 * @see #LAYER_TYPE_SOFTWARE 3016 * @see #LAYER_TYPE_HARDWARE 3017 */ 3018 public static final int LAYER_TYPE_NONE = 0; 3019 3020 /** 3021 * <p>Indicates that the view has a software layer. A software layer is backed 3022 * by a bitmap and causes the view to be rendered using Android's software 3023 * rendering pipeline, even if hardware acceleration is enabled.</p> 3024 * 3025 * <p>Software layers have various usages:</p> 3026 * <p>When the application is not using hardware acceleration, a software layer 3027 * is useful to apply a specific color filter and/or blending mode and/or 3028 * translucency to a view and all its children.</p> 3029 * <p>When the application is using hardware acceleration, a software layer 3030 * is useful to render drawing primitives not supported by the hardware 3031 * accelerated pipeline. It can also be used to cache a complex view tree 3032 * into a texture and reduce the complexity of drawing operations. For instance, 3033 * when animating a complex view tree with a translation, a software layer can 3034 * be used to render the view tree only once.</p> 3035 * <p>Software layers should be avoided when the affected view tree updates 3036 * often. Every update will require to re-render the software layer, which can 3037 * potentially be slow (particularly when hardware acceleration is turned on 3038 * since the layer will have to be uploaded into a hardware texture after every 3039 * update.)</p> 3040 * 3041 * @see #getLayerType() 3042 * @see #setLayerType(int, android.graphics.Paint) 3043 * @see #LAYER_TYPE_NONE 3044 * @see #LAYER_TYPE_HARDWARE 3045 */ 3046 public static final int LAYER_TYPE_SOFTWARE = 1; 3047 3048 /** 3049 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3050 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3051 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3052 * rendering pipeline, but only if hardware acceleration is turned on for the 3053 * view hierarchy. When hardware acceleration is turned off, hardware layers 3054 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3055 * 3056 * <p>A hardware layer is useful to apply a specific color filter and/or 3057 * blending mode and/or translucency to a view and all its children.</p> 3058 * <p>A hardware layer can be used to cache a complex view tree into a 3059 * texture and reduce the complexity of drawing operations. For instance, 3060 * when animating a complex view tree with a translation, a hardware layer can 3061 * be used to render the view tree only once.</p> 3062 * <p>A hardware layer can also be used to increase the rendering quality when 3063 * rotation transformations are applied on a view. It can also be used to 3064 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3065 * 3066 * @see #getLayerType() 3067 * @see #setLayerType(int, android.graphics.Paint) 3068 * @see #LAYER_TYPE_NONE 3069 * @see #LAYER_TYPE_SOFTWARE 3070 */ 3071 public static final int LAYER_TYPE_HARDWARE = 2; 3072 3073 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3074 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3075 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3076 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3077 }) 3078 int mLayerType = LAYER_TYPE_NONE; 3079 Paint mLayerPaint; 3080 Rect mLocalDirtyRect; 3081 3082 /** 3083 * Set to true when the view is sending hover accessibility events because it 3084 * is the innermost hovered view. 3085 */ 3086 private boolean mSendingHoverAccessibilityEvents; 3087 3088 /** 3089 * Simple constructor to use when creating a view from code. 3090 * 3091 * @param context The Context the view is running in, through which it can 3092 * access the current theme, resources, etc. 3093 */ 3094 public View(Context context) { 3095 mContext = context; 3096 mResources = context != null ? context.getResources() : null; 3097 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3098 // Set layout and text direction defaults 3099 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3100 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3101 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3102 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3103 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3104 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3105 mUserPaddingStart = -1; 3106 mUserPaddingEnd = -1; 3107 mUserPaddingRelative = false; 3108 } 3109 3110 /** 3111 * Delegate for injecting accessiblity functionality. 3112 */ 3113 AccessibilityDelegate mAccessibilityDelegate; 3114 3115 /** 3116 * Consistency verifier for debugging purposes. 3117 * @hide 3118 */ 3119 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3120 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3121 new InputEventConsistencyVerifier(this, 0) : null; 3122 3123 /** 3124 * Constructor that is called when inflating a view from XML. This is called 3125 * when a view is being constructed from an XML file, supplying attributes 3126 * that were specified in the XML file. This version uses a default style of 3127 * 0, so the only attribute values applied are those in the Context's Theme 3128 * and the given AttributeSet. 3129 * 3130 * <p> 3131 * The method onFinishInflate() will be called after all children have been 3132 * added. 3133 * 3134 * @param context The Context the view is running in, through which it can 3135 * access the current theme, resources, etc. 3136 * @param attrs The attributes of the XML tag that is inflating the view. 3137 * @see #View(Context, AttributeSet, int) 3138 */ 3139 public View(Context context, AttributeSet attrs) { 3140 this(context, attrs, 0); 3141 } 3142 3143 /** 3144 * Perform inflation from XML and apply a class-specific base style. This 3145 * constructor of View allows subclasses to use their own base style when 3146 * they are inflating. For example, a Button class's constructor would call 3147 * this version of the super class constructor and supply 3148 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3149 * the theme's button style to modify all of the base view attributes (in 3150 * particular its background) as well as the Button class's attributes. 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 * @param defStyle The default style to apply to this view. If 0, no style 3156 * will be applied (beyond what is included in the theme). This may 3157 * either be an attribute resource, whose value will be retrieved 3158 * from the current theme, or an explicit style resource. 3159 * @see #View(Context, AttributeSet) 3160 */ 3161 public View(Context context, AttributeSet attrs, int defStyle) { 3162 this(context); 3163 3164 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3165 defStyle, 0); 3166 3167 Drawable background = null; 3168 3169 int leftPadding = -1; 3170 int topPadding = -1; 3171 int rightPadding = -1; 3172 int bottomPadding = -1; 3173 int startPadding = -1; 3174 int endPadding = -1; 3175 3176 int padding = -1; 3177 3178 int viewFlagValues = 0; 3179 int viewFlagMasks = 0; 3180 3181 boolean setScrollContainer = false; 3182 3183 int x = 0; 3184 int y = 0; 3185 3186 float tx = 0; 3187 float ty = 0; 3188 float rotation = 0; 3189 float rotationX = 0; 3190 float rotationY = 0; 3191 float sx = 1f; 3192 float sy = 1f; 3193 boolean transformSet = false; 3194 3195 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3196 3197 int overScrollMode = mOverScrollMode; 3198 final int N = a.getIndexCount(); 3199 for (int i = 0; i < N; i++) { 3200 int attr = a.getIndex(i); 3201 switch (attr) { 3202 case com.android.internal.R.styleable.View_background: 3203 background = a.getDrawable(attr); 3204 break; 3205 case com.android.internal.R.styleable.View_padding: 3206 padding = a.getDimensionPixelSize(attr, -1); 3207 break; 3208 case com.android.internal.R.styleable.View_paddingLeft: 3209 leftPadding = a.getDimensionPixelSize(attr, -1); 3210 break; 3211 case com.android.internal.R.styleable.View_paddingTop: 3212 topPadding = a.getDimensionPixelSize(attr, -1); 3213 break; 3214 case com.android.internal.R.styleable.View_paddingRight: 3215 rightPadding = a.getDimensionPixelSize(attr, -1); 3216 break; 3217 case com.android.internal.R.styleable.View_paddingBottom: 3218 bottomPadding = a.getDimensionPixelSize(attr, -1); 3219 break; 3220 case com.android.internal.R.styleable.View_paddingStart: 3221 startPadding = a.getDimensionPixelSize(attr, -1); 3222 break; 3223 case com.android.internal.R.styleable.View_paddingEnd: 3224 endPadding = a.getDimensionPixelSize(attr, -1); 3225 break; 3226 case com.android.internal.R.styleable.View_scrollX: 3227 x = a.getDimensionPixelOffset(attr, 0); 3228 break; 3229 case com.android.internal.R.styleable.View_scrollY: 3230 y = a.getDimensionPixelOffset(attr, 0); 3231 break; 3232 case com.android.internal.R.styleable.View_alpha: 3233 setAlpha(a.getFloat(attr, 1f)); 3234 break; 3235 case com.android.internal.R.styleable.View_transformPivotX: 3236 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3237 break; 3238 case com.android.internal.R.styleable.View_transformPivotY: 3239 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3240 break; 3241 case com.android.internal.R.styleable.View_translationX: 3242 tx = a.getDimensionPixelOffset(attr, 0); 3243 transformSet = true; 3244 break; 3245 case com.android.internal.R.styleable.View_translationY: 3246 ty = a.getDimensionPixelOffset(attr, 0); 3247 transformSet = true; 3248 break; 3249 case com.android.internal.R.styleable.View_rotation: 3250 rotation = a.getFloat(attr, 0); 3251 transformSet = true; 3252 break; 3253 case com.android.internal.R.styleable.View_rotationX: 3254 rotationX = a.getFloat(attr, 0); 3255 transformSet = true; 3256 break; 3257 case com.android.internal.R.styleable.View_rotationY: 3258 rotationY = a.getFloat(attr, 0); 3259 transformSet = true; 3260 break; 3261 case com.android.internal.R.styleable.View_scaleX: 3262 sx = a.getFloat(attr, 1f); 3263 transformSet = true; 3264 break; 3265 case com.android.internal.R.styleable.View_scaleY: 3266 sy = a.getFloat(attr, 1f); 3267 transformSet = true; 3268 break; 3269 case com.android.internal.R.styleable.View_id: 3270 mID = a.getResourceId(attr, NO_ID); 3271 break; 3272 case com.android.internal.R.styleable.View_tag: 3273 mTag = a.getText(attr); 3274 break; 3275 case com.android.internal.R.styleable.View_fitsSystemWindows: 3276 if (a.getBoolean(attr, false)) { 3277 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3278 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3279 } 3280 break; 3281 case com.android.internal.R.styleable.View_focusable: 3282 if (a.getBoolean(attr, false)) { 3283 viewFlagValues |= FOCUSABLE; 3284 viewFlagMasks |= FOCUSABLE_MASK; 3285 } 3286 break; 3287 case com.android.internal.R.styleable.View_focusableInTouchMode: 3288 if (a.getBoolean(attr, false)) { 3289 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3290 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3291 } 3292 break; 3293 case com.android.internal.R.styleable.View_clickable: 3294 if (a.getBoolean(attr, false)) { 3295 viewFlagValues |= CLICKABLE; 3296 viewFlagMasks |= CLICKABLE; 3297 } 3298 break; 3299 case com.android.internal.R.styleable.View_longClickable: 3300 if (a.getBoolean(attr, false)) { 3301 viewFlagValues |= LONG_CLICKABLE; 3302 viewFlagMasks |= LONG_CLICKABLE; 3303 } 3304 break; 3305 case com.android.internal.R.styleable.View_saveEnabled: 3306 if (!a.getBoolean(attr, true)) { 3307 viewFlagValues |= SAVE_DISABLED; 3308 viewFlagMasks |= SAVE_DISABLED_MASK; 3309 } 3310 break; 3311 case com.android.internal.R.styleable.View_duplicateParentState: 3312 if (a.getBoolean(attr, false)) { 3313 viewFlagValues |= DUPLICATE_PARENT_STATE; 3314 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3315 } 3316 break; 3317 case com.android.internal.R.styleable.View_visibility: 3318 final int visibility = a.getInt(attr, 0); 3319 if (visibility != 0) { 3320 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3321 viewFlagMasks |= VISIBILITY_MASK; 3322 } 3323 break; 3324 case com.android.internal.R.styleable.View_layoutDirection: 3325 // Clear any layout direction flags (included resolved bits) already set 3326 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3327 // Set the layout direction flags depending on the value of the attribute 3328 final int layoutDirection = a.getInt(attr, -1); 3329 final int value = (layoutDirection != -1) ? 3330 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3331 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3332 break; 3333 case com.android.internal.R.styleable.View_drawingCacheQuality: 3334 final int cacheQuality = a.getInt(attr, 0); 3335 if (cacheQuality != 0) { 3336 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3337 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3338 } 3339 break; 3340 case com.android.internal.R.styleable.View_contentDescription: 3341 mContentDescription = a.getString(attr); 3342 break; 3343 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3344 if (!a.getBoolean(attr, true)) { 3345 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3346 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3347 } 3348 break; 3349 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3350 if (!a.getBoolean(attr, true)) { 3351 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3352 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3353 } 3354 break; 3355 case R.styleable.View_scrollbars: 3356 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3357 if (scrollbars != SCROLLBARS_NONE) { 3358 viewFlagValues |= scrollbars; 3359 viewFlagMasks |= SCROLLBARS_MASK; 3360 initializeScrollbars(a); 3361 } 3362 break; 3363 //noinspection deprecation 3364 case R.styleable.View_fadingEdge: 3365 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3366 // Ignore the attribute starting with ICS 3367 break; 3368 } 3369 // With builds < ICS, fall through and apply fading edges 3370 case R.styleable.View_requiresFadingEdge: 3371 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3372 if (fadingEdge != FADING_EDGE_NONE) { 3373 viewFlagValues |= fadingEdge; 3374 viewFlagMasks |= FADING_EDGE_MASK; 3375 initializeFadingEdge(a); 3376 } 3377 break; 3378 case R.styleable.View_scrollbarStyle: 3379 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3380 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3381 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3382 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3383 } 3384 break; 3385 case R.styleable.View_isScrollContainer: 3386 setScrollContainer = true; 3387 if (a.getBoolean(attr, false)) { 3388 setScrollContainer(true); 3389 } 3390 break; 3391 case com.android.internal.R.styleable.View_keepScreenOn: 3392 if (a.getBoolean(attr, false)) { 3393 viewFlagValues |= KEEP_SCREEN_ON; 3394 viewFlagMasks |= KEEP_SCREEN_ON; 3395 } 3396 break; 3397 case R.styleable.View_filterTouchesWhenObscured: 3398 if (a.getBoolean(attr, false)) { 3399 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3400 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3401 } 3402 break; 3403 case R.styleable.View_nextFocusLeft: 3404 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3405 break; 3406 case R.styleable.View_nextFocusRight: 3407 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3408 break; 3409 case R.styleable.View_nextFocusUp: 3410 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3411 break; 3412 case R.styleable.View_nextFocusDown: 3413 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3414 break; 3415 case R.styleable.View_nextFocusForward: 3416 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3417 break; 3418 case R.styleable.View_minWidth: 3419 mMinWidth = a.getDimensionPixelSize(attr, 0); 3420 break; 3421 case R.styleable.View_minHeight: 3422 mMinHeight = a.getDimensionPixelSize(attr, 0); 3423 break; 3424 case R.styleable.View_onClick: 3425 if (context.isRestricted()) { 3426 throw new IllegalStateException("The android:onClick attribute cannot " 3427 + "be used within a restricted context"); 3428 } 3429 3430 final String handlerName = a.getString(attr); 3431 if (handlerName != null) { 3432 setOnClickListener(new OnClickListener() { 3433 private Method mHandler; 3434 3435 public void onClick(View v) { 3436 if (mHandler == null) { 3437 try { 3438 mHandler = getContext().getClass().getMethod(handlerName, 3439 View.class); 3440 } catch (NoSuchMethodException e) { 3441 int id = getId(); 3442 String idText = id == NO_ID ? "" : " with id '" 3443 + getContext().getResources().getResourceEntryName( 3444 id) + "'"; 3445 throw new IllegalStateException("Could not find a method " + 3446 handlerName + "(View) in the activity " 3447 + getContext().getClass() + " for onClick handler" 3448 + " on view " + View.this.getClass() + idText, e); 3449 } 3450 } 3451 3452 try { 3453 mHandler.invoke(getContext(), View.this); 3454 } catch (IllegalAccessException e) { 3455 throw new IllegalStateException("Could not execute non " 3456 + "public method of the activity", e); 3457 } catch (InvocationTargetException e) { 3458 throw new IllegalStateException("Could not execute " 3459 + "method of the activity", e); 3460 } 3461 } 3462 }); 3463 } 3464 break; 3465 case R.styleable.View_overScrollMode: 3466 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3467 break; 3468 case R.styleable.View_verticalScrollbarPosition: 3469 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3470 break; 3471 case R.styleable.View_layerType: 3472 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3473 break; 3474 case R.styleable.View_textDirection: 3475 // Clear any text direction flag already set 3476 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3477 // Set the text direction flags depending on the value of the attribute 3478 final int textDirection = a.getInt(attr, -1); 3479 if (textDirection != -1) { 3480 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3481 } 3482 break; 3483 case R.styleable.View_textAlignment: 3484 // Clear any text alignment flag already set 3485 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3486 // Set the text alignment flag depending on the value of the attribute 3487 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3488 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3489 break; 3490 case R.styleable.View_importantForAccessibility: 3491 setImportantForAccessibility(a.getInt(attr, 3492 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3493 } 3494 } 3495 3496 a.recycle(); 3497 3498 setOverScrollMode(overScrollMode); 3499 3500 if (background != null) { 3501 setBackground(background); 3502 } 3503 3504 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3505 // layout direction). Those cached values will be used later during padding resolution. 3506 mUserPaddingStart = startPadding; 3507 mUserPaddingEnd = endPadding; 3508 3509 updateUserPaddingRelative(); 3510 3511 if (padding >= 0) { 3512 leftPadding = padding; 3513 topPadding = padding; 3514 rightPadding = padding; 3515 bottomPadding = padding; 3516 } 3517 3518 // If the user specified the padding (either with android:padding or 3519 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3520 // use the default padding or the padding from the background drawable 3521 // (stored at this point in mPadding*) 3522 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3523 topPadding >= 0 ? topPadding : mPaddingTop, 3524 rightPadding >= 0 ? rightPadding : mPaddingRight, 3525 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3526 3527 if (viewFlagMasks != 0) { 3528 setFlags(viewFlagValues, viewFlagMasks); 3529 } 3530 3531 // Needs to be called after mViewFlags is set 3532 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3533 recomputePadding(); 3534 } 3535 3536 if (x != 0 || y != 0) { 3537 scrollTo(x, y); 3538 } 3539 3540 if (transformSet) { 3541 setTranslationX(tx); 3542 setTranslationY(ty); 3543 setRotation(rotation); 3544 setRotationX(rotationX); 3545 setRotationY(rotationY); 3546 setScaleX(sx); 3547 setScaleY(sy); 3548 } 3549 3550 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3551 setScrollContainer(true); 3552 } 3553 3554 computeOpaqueFlags(); 3555 } 3556 3557 private void updateUserPaddingRelative() { 3558 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3559 } 3560 3561 /** 3562 * Non-public constructor for use in testing 3563 */ 3564 View() { 3565 mResources = null; 3566 } 3567 3568 /** 3569 * <p> 3570 * Initializes the fading edges from a given set of styled attributes. This 3571 * method should be called by subclasses that need fading edges and when an 3572 * instance of these subclasses is created programmatically rather than 3573 * being inflated from XML. This method is automatically called when the XML 3574 * is inflated. 3575 * </p> 3576 * 3577 * @param a the styled attributes set to initialize the fading edges from 3578 */ 3579 protected void initializeFadingEdge(TypedArray a) { 3580 initScrollCache(); 3581 3582 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3583 R.styleable.View_fadingEdgeLength, 3584 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3585 } 3586 3587 /** 3588 * Returns the size of the vertical faded edges used to indicate that more 3589 * content in this view is visible. 3590 * 3591 * @return The size in pixels of the vertical faded edge or 0 if vertical 3592 * faded edges are not enabled for this view. 3593 * @attr ref android.R.styleable#View_fadingEdgeLength 3594 */ 3595 public int getVerticalFadingEdgeLength() { 3596 if (isVerticalFadingEdgeEnabled()) { 3597 ScrollabilityCache cache = mScrollCache; 3598 if (cache != null) { 3599 return cache.fadingEdgeLength; 3600 } 3601 } 3602 return 0; 3603 } 3604 3605 /** 3606 * Set the size of the faded edge used to indicate that more content in this 3607 * view is available. Will not change whether the fading edge is enabled; use 3608 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3609 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3610 * for the vertical or horizontal fading edges. 3611 * 3612 * @param length The size in pixels of the faded edge used to indicate that more 3613 * content in this view is visible. 3614 */ 3615 public void setFadingEdgeLength(int length) { 3616 initScrollCache(); 3617 mScrollCache.fadingEdgeLength = length; 3618 } 3619 3620 /** 3621 * Returns the size of the horizontal faded edges used to indicate that more 3622 * content in this view is visible. 3623 * 3624 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3625 * faded edges are not enabled for this view. 3626 * @attr ref android.R.styleable#View_fadingEdgeLength 3627 */ 3628 public int getHorizontalFadingEdgeLength() { 3629 if (isHorizontalFadingEdgeEnabled()) { 3630 ScrollabilityCache cache = mScrollCache; 3631 if (cache != null) { 3632 return cache.fadingEdgeLength; 3633 } 3634 } 3635 return 0; 3636 } 3637 3638 /** 3639 * Returns the width of the vertical scrollbar. 3640 * 3641 * @return The width in pixels of the vertical scrollbar or 0 if there 3642 * is no vertical scrollbar. 3643 */ 3644 public int getVerticalScrollbarWidth() { 3645 ScrollabilityCache cache = mScrollCache; 3646 if (cache != null) { 3647 ScrollBarDrawable scrollBar = cache.scrollBar; 3648 if (scrollBar != null) { 3649 int size = scrollBar.getSize(true); 3650 if (size <= 0) { 3651 size = cache.scrollBarSize; 3652 } 3653 return size; 3654 } 3655 return 0; 3656 } 3657 return 0; 3658 } 3659 3660 /** 3661 * Returns the height of the horizontal scrollbar. 3662 * 3663 * @return The height in pixels of the horizontal scrollbar or 0 if 3664 * there is no horizontal scrollbar. 3665 */ 3666 protected int getHorizontalScrollbarHeight() { 3667 ScrollabilityCache cache = mScrollCache; 3668 if (cache != null) { 3669 ScrollBarDrawable scrollBar = cache.scrollBar; 3670 if (scrollBar != null) { 3671 int size = scrollBar.getSize(false); 3672 if (size <= 0) { 3673 size = cache.scrollBarSize; 3674 } 3675 return size; 3676 } 3677 return 0; 3678 } 3679 return 0; 3680 } 3681 3682 /** 3683 * <p> 3684 * Initializes the scrollbars from a given set of styled attributes. This 3685 * method should be called by subclasses that need scrollbars and when an 3686 * instance of these subclasses is created programmatically rather than 3687 * being inflated from XML. This method is automatically called when the XML 3688 * is inflated. 3689 * </p> 3690 * 3691 * @param a the styled attributes set to initialize the scrollbars from 3692 */ 3693 protected void initializeScrollbars(TypedArray a) { 3694 initScrollCache(); 3695 3696 final ScrollabilityCache scrollabilityCache = mScrollCache; 3697 3698 if (scrollabilityCache.scrollBar == null) { 3699 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3700 } 3701 3702 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3703 3704 if (!fadeScrollbars) { 3705 scrollabilityCache.state = ScrollabilityCache.ON; 3706 } 3707 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3708 3709 3710 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3711 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3712 .getScrollBarFadeDuration()); 3713 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3714 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3715 ViewConfiguration.getScrollDefaultDelay()); 3716 3717 3718 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3719 com.android.internal.R.styleable.View_scrollbarSize, 3720 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3721 3722 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3723 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3724 3725 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3726 if (thumb != null) { 3727 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3728 } 3729 3730 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3731 false); 3732 if (alwaysDraw) { 3733 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3734 } 3735 3736 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3737 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3738 3739 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3740 if (thumb != null) { 3741 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3742 } 3743 3744 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3745 false); 3746 if (alwaysDraw) { 3747 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3748 } 3749 3750 // Re-apply user/background padding so that scrollbar(s) get added 3751 resolvePadding(); 3752 } 3753 3754 /** 3755 * <p> 3756 * Initalizes the scrollability cache if necessary. 3757 * </p> 3758 */ 3759 private void initScrollCache() { 3760 if (mScrollCache == null) { 3761 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3762 } 3763 } 3764 3765 private ScrollabilityCache getScrollCache() { 3766 initScrollCache(); 3767 return mScrollCache; 3768 } 3769 3770 /** 3771 * Set the position of the vertical scroll bar. Should be one of 3772 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3773 * {@link #SCROLLBAR_POSITION_RIGHT}. 3774 * 3775 * @param position Where the vertical scroll bar should be positioned. 3776 */ 3777 public void setVerticalScrollbarPosition(int position) { 3778 if (mVerticalScrollbarPosition != position) { 3779 mVerticalScrollbarPosition = position; 3780 computeOpaqueFlags(); 3781 resolvePadding(); 3782 } 3783 } 3784 3785 /** 3786 * @return The position where the vertical scroll bar will show, if applicable. 3787 * @see #setVerticalScrollbarPosition(int) 3788 */ 3789 public int getVerticalScrollbarPosition() { 3790 return mVerticalScrollbarPosition; 3791 } 3792 3793 ListenerInfo getListenerInfo() { 3794 if (mListenerInfo != null) { 3795 return mListenerInfo; 3796 } 3797 mListenerInfo = new ListenerInfo(); 3798 return mListenerInfo; 3799 } 3800 3801 /** 3802 * Register a callback to be invoked when focus of this view changed. 3803 * 3804 * @param l The callback that will run. 3805 */ 3806 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3807 getListenerInfo().mOnFocusChangeListener = l; 3808 } 3809 3810 /** 3811 * Add a listener that will be called when the bounds of the view change due to 3812 * layout processing. 3813 * 3814 * @param listener The listener that will be called when layout bounds change. 3815 */ 3816 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3817 ListenerInfo li = getListenerInfo(); 3818 if (li.mOnLayoutChangeListeners == null) { 3819 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3820 } 3821 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3822 li.mOnLayoutChangeListeners.add(listener); 3823 } 3824 } 3825 3826 /** 3827 * Remove a listener for layout changes. 3828 * 3829 * @param listener The listener for layout bounds change. 3830 */ 3831 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3832 ListenerInfo li = mListenerInfo; 3833 if (li == null || li.mOnLayoutChangeListeners == null) { 3834 return; 3835 } 3836 li.mOnLayoutChangeListeners.remove(listener); 3837 } 3838 3839 /** 3840 * Add a listener for attach state changes. 3841 * 3842 * This listener will be called whenever this view is attached or detached 3843 * from a window. Remove the listener using 3844 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3845 * 3846 * @param listener Listener to attach 3847 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3848 */ 3849 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3850 ListenerInfo li = getListenerInfo(); 3851 if (li.mOnAttachStateChangeListeners == null) { 3852 li.mOnAttachStateChangeListeners 3853 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3854 } 3855 li.mOnAttachStateChangeListeners.add(listener); 3856 } 3857 3858 /** 3859 * Remove a listener for attach state changes. The listener will receive no further 3860 * notification of window attach/detach events. 3861 * 3862 * @param listener Listener to remove 3863 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3864 */ 3865 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3866 ListenerInfo li = mListenerInfo; 3867 if (li == null || li.mOnAttachStateChangeListeners == null) { 3868 return; 3869 } 3870 li.mOnAttachStateChangeListeners.remove(listener); 3871 } 3872 3873 /** 3874 * Returns the focus-change callback registered for this view. 3875 * 3876 * @return The callback, or null if one is not registered. 3877 */ 3878 public OnFocusChangeListener getOnFocusChangeListener() { 3879 ListenerInfo li = mListenerInfo; 3880 return li != null ? li.mOnFocusChangeListener : null; 3881 } 3882 3883 /** 3884 * Register a callback to be invoked when this view is clicked. If this view is not 3885 * clickable, it becomes clickable. 3886 * 3887 * @param l The callback that will run 3888 * 3889 * @see #setClickable(boolean) 3890 */ 3891 public void setOnClickListener(OnClickListener l) { 3892 if (!isClickable()) { 3893 setClickable(true); 3894 } 3895 getListenerInfo().mOnClickListener = l; 3896 } 3897 3898 /** 3899 * Return whether this view has an attached OnClickListener. Returns 3900 * true if there is a listener, false if there is none. 3901 */ 3902 public boolean hasOnClickListeners() { 3903 ListenerInfo li = mListenerInfo; 3904 return (li != null && li.mOnClickListener != null); 3905 } 3906 3907 /** 3908 * Register a callback to be invoked when this view is clicked and held. If this view is not 3909 * long clickable, it becomes long clickable. 3910 * 3911 * @param l The callback that will run 3912 * 3913 * @see #setLongClickable(boolean) 3914 */ 3915 public void setOnLongClickListener(OnLongClickListener l) { 3916 if (!isLongClickable()) { 3917 setLongClickable(true); 3918 } 3919 getListenerInfo().mOnLongClickListener = l; 3920 } 3921 3922 /** 3923 * Register a callback to be invoked when the context menu for this view is 3924 * being built. If this view is not long clickable, it becomes long clickable. 3925 * 3926 * @param l The callback that will run 3927 * 3928 */ 3929 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3930 if (!isLongClickable()) { 3931 setLongClickable(true); 3932 } 3933 getListenerInfo().mOnCreateContextMenuListener = l; 3934 } 3935 3936 /** 3937 * Call this view's OnClickListener, if it is defined. Performs all normal 3938 * actions associated with clicking: reporting accessibility event, playing 3939 * a sound, etc. 3940 * 3941 * @return True there was an assigned OnClickListener that was called, false 3942 * otherwise is returned. 3943 */ 3944 public boolean performClick() { 3945 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3946 3947 ListenerInfo li = mListenerInfo; 3948 if (li != null && li.mOnClickListener != null) { 3949 playSoundEffect(SoundEffectConstants.CLICK); 3950 li.mOnClickListener.onClick(this); 3951 return true; 3952 } 3953 3954 return false; 3955 } 3956 3957 /** 3958 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3959 * this only calls the listener, and does not do any associated clicking 3960 * actions like reporting an accessibility event. 3961 * 3962 * @return True there was an assigned OnClickListener that was called, false 3963 * otherwise is returned. 3964 */ 3965 public boolean callOnClick() { 3966 ListenerInfo li = mListenerInfo; 3967 if (li != null && li.mOnClickListener != null) { 3968 li.mOnClickListener.onClick(this); 3969 return true; 3970 } 3971 return false; 3972 } 3973 3974 /** 3975 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3976 * OnLongClickListener did not consume the event. 3977 * 3978 * @return True if one of the above receivers consumed the event, false otherwise. 3979 */ 3980 public boolean performLongClick() { 3981 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3982 3983 boolean handled = false; 3984 ListenerInfo li = mListenerInfo; 3985 if (li != null && li.mOnLongClickListener != null) { 3986 handled = li.mOnLongClickListener.onLongClick(View.this); 3987 } 3988 if (!handled) { 3989 handled = showContextMenu(); 3990 } 3991 if (handled) { 3992 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3993 } 3994 return handled; 3995 } 3996 3997 /** 3998 * Performs button-related actions during a touch down event. 3999 * 4000 * @param event The event. 4001 * @return True if the down was consumed. 4002 * 4003 * @hide 4004 */ 4005 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4006 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4007 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4008 return true; 4009 } 4010 } 4011 return false; 4012 } 4013 4014 /** 4015 * Bring up the context menu for this view. 4016 * 4017 * @return Whether a context menu was displayed. 4018 */ 4019 public boolean showContextMenu() { 4020 return getParent().showContextMenuForChild(this); 4021 } 4022 4023 /** 4024 * Bring up the context menu for this view, referring to the item under the specified point. 4025 * 4026 * @param x The referenced x coordinate. 4027 * @param y The referenced y coordinate. 4028 * @param metaState The keyboard modifiers that were pressed. 4029 * @return Whether a context menu was displayed. 4030 * 4031 * @hide 4032 */ 4033 public boolean showContextMenu(float x, float y, int metaState) { 4034 return showContextMenu(); 4035 } 4036 4037 /** 4038 * Start an action mode. 4039 * 4040 * @param callback Callback that will control the lifecycle of the action mode 4041 * @return The new action mode if it is started, null otherwise 4042 * 4043 * @see ActionMode 4044 */ 4045 public ActionMode startActionMode(ActionMode.Callback callback) { 4046 ViewParent parent = getParent(); 4047 if (parent == null) return null; 4048 return parent.startActionModeForChild(this, callback); 4049 } 4050 4051 /** 4052 * Register a callback to be invoked when a key is pressed in this view. 4053 * @param l the key listener to attach to this view 4054 */ 4055 public void setOnKeyListener(OnKeyListener l) { 4056 getListenerInfo().mOnKeyListener = l; 4057 } 4058 4059 /** 4060 * Register a callback to be invoked when a touch event is sent to this view. 4061 * @param l the touch listener to attach to this view 4062 */ 4063 public void setOnTouchListener(OnTouchListener l) { 4064 getListenerInfo().mOnTouchListener = l; 4065 } 4066 4067 /** 4068 * Register a callback to be invoked when a generic motion event is sent to this view. 4069 * @param l the generic motion listener to attach to this view 4070 */ 4071 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4072 getListenerInfo().mOnGenericMotionListener = l; 4073 } 4074 4075 /** 4076 * Register a callback to be invoked when a hover event is sent to this view. 4077 * @param l the hover listener to attach to this view 4078 */ 4079 public void setOnHoverListener(OnHoverListener l) { 4080 getListenerInfo().mOnHoverListener = l; 4081 } 4082 4083 /** 4084 * Register a drag event listener callback object for this View. The parameter is 4085 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4086 * View, the system calls the 4087 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4088 * @param l An implementation of {@link android.view.View.OnDragListener}. 4089 */ 4090 public void setOnDragListener(OnDragListener l) { 4091 getListenerInfo().mOnDragListener = l; 4092 } 4093 4094 /** 4095 * Give this view focus. This will cause 4096 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4097 * 4098 * Note: this does not check whether this {@link View} should get focus, it just 4099 * gives it focus no matter what. It should only be called internally by framework 4100 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4101 * 4102 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4103 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4104 * focus moved when requestFocus() is called. It may not always 4105 * apply, in which case use the default View.FOCUS_DOWN. 4106 * @param previouslyFocusedRect The rectangle of the view that had focus 4107 * prior in this View's coordinate system. 4108 */ 4109 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4110 if (DBG) { 4111 System.out.println(this + " requestFocus()"); 4112 } 4113 4114 if ((mPrivateFlags & FOCUSED) == 0) { 4115 mPrivateFlags |= FOCUSED; 4116 4117 if (mParent != null) { 4118 mParent.requestChildFocus(this, this); 4119 } 4120 4121 onFocusChanged(true, direction, previouslyFocusedRect); 4122 refreshDrawableState(); 4123 4124 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4125 notifyAccessibilityStateChanged(); 4126 } 4127 } 4128 } 4129 4130 /** 4131 * Request that a rectangle of this view be visible on the screen, 4132 * scrolling if necessary just enough. 4133 * 4134 * <p>A View should call this if it maintains some notion of which part 4135 * of its content is interesting. For example, a text editing view 4136 * should call this when its cursor moves. 4137 * 4138 * @param rectangle The rectangle. 4139 * @return Whether any parent scrolled. 4140 */ 4141 public boolean requestRectangleOnScreen(Rect rectangle) { 4142 return requestRectangleOnScreen(rectangle, false); 4143 } 4144 4145 /** 4146 * Request that a rectangle of this view be visible on the screen, 4147 * scrolling if necessary just enough. 4148 * 4149 * <p>A View should call this if it maintains some notion of which part 4150 * of its content is interesting. For example, a text editing view 4151 * should call this when its cursor moves. 4152 * 4153 * <p>When <code>immediate</code> is set to true, scrolling will not be 4154 * animated. 4155 * 4156 * @param rectangle The rectangle. 4157 * @param immediate True to forbid animated scrolling, false otherwise 4158 * @return Whether any parent scrolled. 4159 */ 4160 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4161 View child = this; 4162 ViewParent parent = mParent; 4163 boolean scrolled = false; 4164 while (parent != null) { 4165 scrolled |= parent.requestChildRectangleOnScreen(child, 4166 rectangle, immediate); 4167 4168 // offset rect so next call has the rectangle in the 4169 // coordinate system of its direct child. 4170 rectangle.offset(child.getLeft(), child.getTop()); 4171 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4172 4173 if (!(parent instanceof View)) { 4174 break; 4175 } 4176 4177 child = (View) parent; 4178 parent = child.getParent(); 4179 } 4180 return scrolled; 4181 } 4182 4183 /** 4184 * Called when this view wants to give up focus. If focus is cleared 4185 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4186 * <p> 4187 * <strong>Note:</strong> When a View clears focus the framework is trying 4188 * to give focus to the first focusable View from the top. Hence, if this 4189 * View is the first from the top that can take focus, then all callbacks 4190 * related to clearing focus will be invoked after wich the framework will 4191 * give focus to this view. 4192 * </p> 4193 */ 4194 public void clearFocus() { 4195 if (DBG) { 4196 System.out.println(this + " clearFocus()"); 4197 } 4198 4199 if ((mPrivateFlags & FOCUSED) != 0) { 4200 mPrivateFlags &= ~FOCUSED; 4201 4202 if (mParent != null) { 4203 mParent.clearChildFocus(this); 4204 } 4205 4206 onFocusChanged(false, 0, null); 4207 4208 refreshDrawableState(); 4209 4210 ensureInputFocusOnFirstFocusable(); 4211 4212 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4213 notifyAccessibilityStateChanged(); 4214 } 4215 } 4216 } 4217 4218 void ensureInputFocusOnFirstFocusable() { 4219 View root = getRootView(); 4220 if (root != null) { 4221 root.requestFocus(); 4222 } 4223 } 4224 4225 /** 4226 * Called internally by the view system when a new view is getting focus. 4227 * This is what clears the old focus. 4228 */ 4229 void unFocus() { 4230 if (DBG) { 4231 System.out.println(this + " unFocus()"); 4232 } 4233 4234 if ((mPrivateFlags & FOCUSED) != 0) { 4235 mPrivateFlags &= ~FOCUSED; 4236 4237 onFocusChanged(false, 0, null); 4238 refreshDrawableState(); 4239 4240 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4241 notifyAccessibilityStateChanged(); 4242 } 4243 } 4244 } 4245 4246 /** 4247 * Returns true if this view has focus iteself, or is the ancestor of the 4248 * view that has focus. 4249 * 4250 * @return True if this view has or contains focus, false otherwise. 4251 */ 4252 @ViewDebug.ExportedProperty(category = "focus") 4253 public boolean hasFocus() { 4254 return (mPrivateFlags & FOCUSED) != 0; 4255 } 4256 4257 /** 4258 * Returns true if this view is focusable or if it contains a reachable View 4259 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4260 * is a View whose parents do not block descendants focus. 4261 * 4262 * Only {@link #VISIBLE} views are considered focusable. 4263 * 4264 * @return True if the view is focusable or if the view contains a focusable 4265 * View, false otherwise. 4266 * 4267 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4268 */ 4269 public boolean hasFocusable() { 4270 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4271 } 4272 4273 /** 4274 * Called by the view system when the focus state of this view changes. 4275 * When the focus change event is caused by directional navigation, direction 4276 * and previouslyFocusedRect provide insight into where the focus is coming from. 4277 * When overriding, be sure to call up through to the super class so that 4278 * the standard focus handling will occur. 4279 * 4280 * @param gainFocus True if the View has focus; false otherwise. 4281 * @param direction The direction focus has moved when requestFocus() 4282 * is called to give this view focus. Values are 4283 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4284 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4285 * It may not always apply, in which case use the default. 4286 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4287 * system, of the previously focused view. If applicable, this will be 4288 * passed in as finer grained information about where the focus is coming 4289 * from (in addition to direction). Will be <code>null</code> otherwise. 4290 */ 4291 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4292 if (gainFocus) { 4293 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4294 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4295 requestAccessibilityFocus(); 4296 } 4297 } 4298 4299 InputMethodManager imm = InputMethodManager.peekInstance(); 4300 if (!gainFocus) { 4301 if (isPressed()) { 4302 setPressed(false); 4303 } 4304 if (imm != null && mAttachInfo != null 4305 && mAttachInfo.mHasWindowFocus) { 4306 imm.focusOut(this); 4307 } 4308 onFocusLost(); 4309 } else if (imm != null && mAttachInfo != null 4310 && mAttachInfo.mHasWindowFocus) { 4311 imm.focusIn(this); 4312 } 4313 4314 invalidate(true); 4315 ListenerInfo li = mListenerInfo; 4316 if (li != null && li.mOnFocusChangeListener != null) { 4317 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4318 } 4319 4320 if (mAttachInfo != null) { 4321 mAttachInfo.mKeyDispatchState.reset(this); 4322 } 4323 } 4324 4325 /** 4326 * Sends an accessibility event of the given type. If accessiiblity is 4327 * not enabled this method has no effect. The default implementation calls 4328 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4329 * to populate information about the event source (this View), then calls 4330 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4331 * populate the text content of the event source including its descendants, 4332 * and last calls 4333 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4334 * on its parent to resuest sending of the event to interested parties. 4335 * <p> 4336 * If an {@link AccessibilityDelegate} has been specified via calling 4337 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4338 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4339 * responsible for handling this call. 4340 * </p> 4341 * 4342 * @param eventType The type of the event to send, as defined by several types from 4343 * {@link android.view.accessibility.AccessibilityEvent}, such as 4344 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4345 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4346 * 4347 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4348 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4349 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4350 * @see AccessibilityDelegate 4351 */ 4352 public void sendAccessibilityEvent(int eventType) { 4353 if (mAccessibilityDelegate != null) { 4354 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4355 } else { 4356 sendAccessibilityEventInternal(eventType); 4357 } 4358 } 4359 4360 /** 4361 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4362 * {@link AccessibilityEvent} to make an announcement which is related to some 4363 * sort of a context change for which none of the events representing UI transitions 4364 * is a good fit. For example, announcing a new page in a book. If accessibility 4365 * is not enabled this method does nothing. 4366 * 4367 * @param text The announcement text. 4368 */ 4369 public void announceForAccessibility(CharSequence text) { 4370 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4371 AccessibilityEvent event = AccessibilityEvent.obtain( 4372 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4373 event.getText().add(text); 4374 sendAccessibilityEventUnchecked(event); 4375 } 4376 } 4377 4378 /** 4379 * @see #sendAccessibilityEvent(int) 4380 * 4381 * Note: Called from the default {@link AccessibilityDelegate}. 4382 */ 4383 void sendAccessibilityEventInternal(int eventType) { 4384 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4385 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4386 } 4387 } 4388 4389 /** 4390 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4391 * takes as an argument an empty {@link AccessibilityEvent} and does not 4392 * perform a check whether accessibility is enabled. 4393 * <p> 4394 * If an {@link AccessibilityDelegate} has been specified via calling 4395 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4396 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4397 * is responsible for handling this call. 4398 * </p> 4399 * 4400 * @param event The event to send. 4401 * 4402 * @see #sendAccessibilityEvent(int) 4403 */ 4404 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4405 if (mAccessibilityDelegate != null) { 4406 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4407 } else { 4408 sendAccessibilityEventUncheckedInternal(event); 4409 } 4410 } 4411 4412 /** 4413 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4414 * 4415 * Note: Called from the default {@link AccessibilityDelegate}. 4416 */ 4417 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4418 if (!isShown()) { 4419 return; 4420 } 4421 onInitializeAccessibilityEvent(event); 4422 // Only a subset of accessibility events populates text content. 4423 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4424 dispatchPopulateAccessibilityEvent(event); 4425 } 4426 // Intercept accessibility focus events fired by virtual nodes to keep 4427 // track of accessibility focus position in such nodes. 4428 final int eventType = event.getEventType(); 4429 switch (eventType) { 4430 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4431 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4432 event.getSourceNodeId()); 4433 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4434 ViewRootImpl viewRootImpl = getViewRootImpl(); 4435 if (viewRootImpl != null) { 4436 viewRootImpl.setAccessibilityFocusedHost(this); 4437 } 4438 } 4439 } break; 4440 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4441 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4442 event.getSourceNodeId()); 4443 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4444 ViewRootImpl viewRootImpl = getViewRootImpl(); 4445 if (viewRootImpl != null) { 4446 viewRootImpl.setAccessibilityFocusedHost(null); 4447 } 4448 } 4449 } break; 4450 } 4451 // In the beginning we called #isShown(), so we know that getParent() is not null. 4452 getParent().requestSendAccessibilityEvent(this, event); 4453 } 4454 4455 /** 4456 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4457 * to its children for adding their text content to the event. Note that the 4458 * event text is populated in a separate dispatch path since we add to the 4459 * event not only the text of the source but also the text of all its descendants. 4460 * A typical implementation will call 4461 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4462 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4463 * on each child. Override this method if custom population of the event text 4464 * content is required. 4465 * <p> 4466 * If an {@link AccessibilityDelegate} has been specified via calling 4467 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4468 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4469 * is responsible for handling this call. 4470 * </p> 4471 * <p> 4472 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4473 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4474 * </p> 4475 * 4476 * @param event The event. 4477 * 4478 * @return True if the event population was completed. 4479 */ 4480 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4481 if (mAccessibilityDelegate != null) { 4482 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4483 } else { 4484 return dispatchPopulateAccessibilityEventInternal(event); 4485 } 4486 } 4487 4488 /** 4489 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4490 * 4491 * Note: Called from the default {@link AccessibilityDelegate}. 4492 */ 4493 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4494 onPopulateAccessibilityEvent(event); 4495 return false; 4496 } 4497 4498 /** 4499 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4500 * giving a chance to this View to populate the accessibility event with its 4501 * text content. While this method is free to modify event 4502 * attributes other than text content, doing so should normally be performed in 4503 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4504 * <p> 4505 * Example: Adding formatted date string to an accessibility event in addition 4506 * to the text added by the super implementation: 4507 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4508 * super.onPopulateAccessibilityEvent(event); 4509 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4510 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4511 * mCurrentDate.getTimeInMillis(), flags); 4512 * event.getText().add(selectedDateUtterance); 4513 * }</pre> 4514 * <p> 4515 * If an {@link AccessibilityDelegate} has been specified via calling 4516 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4517 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4518 * is responsible for handling this call. 4519 * </p> 4520 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4521 * information to the event, in case the default implementation has basic information to add. 4522 * </p> 4523 * 4524 * @param event The accessibility event which to populate. 4525 * 4526 * @see #sendAccessibilityEvent(int) 4527 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4528 */ 4529 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4530 if (mAccessibilityDelegate != null) { 4531 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4532 } else { 4533 onPopulateAccessibilityEventInternal(event); 4534 } 4535 } 4536 4537 /** 4538 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4539 * 4540 * Note: Called from the default {@link AccessibilityDelegate}. 4541 */ 4542 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4543 4544 } 4545 4546 /** 4547 * Initializes an {@link AccessibilityEvent} with information about 4548 * this View which is the event source. In other words, the source of 4549 * an accessibility event is the view whose state change triggered firing 4550 * the event. 4551 * <p> 4552 * Example: Setting the password property of an event in addition 4553 * to properties set by the super implementation: 4554 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4555 * super.onInitializeAccessibilityEvent(event); 4556 * event.setPassword(true); 4557 * }</pre> 4558 * <p> 4559 * If an {@link AccessibilityDelegate} has been specified via calling 4560 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4561 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4562 * is responsible for handling this call. 4563 * </p> 4564 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4565 * information to the event, in case the default implementation has basic information to add. 4566 * </p> 4567 * @param event The event to initialize. 4568 * 4569 * @see #sendAccessibilityEvent(int) 4570 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4571 */ 4572 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4573 if (mAccessibilityDelegate != null) { 4574 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4575 } else { 4576 onInitializeAccessibilityEventInternal(event); 4577 } 4578 } 4579 4580 /** 4581 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4582 * 4583 * Note: Called from the default {@link AccessibilityDelegate}. 4584 */ 4585 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4586 event.setSource(this); 4587 event.setClassName(View.class.getName()); 4588 event.setPackageName(getContext().getPackageName()); 4589 event.setEnabled(isEnabled()); 4590 event.setContentDescription(mContentDescription); 4591 4592 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4593 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4594 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4595 FOCUSABLES_ALL); 4596 event.setItemCount(focusablesTempList.size()); 4597 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4598 focusablesTempList.clear(); 4599 } 4600 } 4601 4602 /** 4603 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4604 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4605 * This method is responsible for obtaining an accessibility node info from a 4606 * pool of reusable instances and calling 4607 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4608 * initialize the former. 4609 * <p> 4610 * Note: The client is responsible for recycling the obtained instance by calling 4611 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4612 * </p> 4613 * 4614 * @return A populated {@link AccessibilityNodeInfo}. 4615 * 4616 * @see AccessibilityNodeInfo 4617 */ 4618 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4619 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4620 if (provider != null) { 4621 return provider.createAccessibilityNodeInfo(View.NO_ID); 4622 } else { 4623 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4624 onInitializeAccessibilityNodeInfo(info); 4625 return info; 4626 } 4627 } 4628 4629 /** 4630 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4631 * The base implementation sets: 4632 * <ul> 4633 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4634 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4635 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4636 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4637 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4638 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4639 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4640 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4641 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4642 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4643 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4644 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4645 * </ul> 4646 * <p> 4647 * Subclasses should override this method, call the super implementation, 4648 * and set additional attributes. 4649 * </p> 4650 * <p> 4651 * If an {@link AccessibilityDelegate} has been specified via calling 4652 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4653 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4654 * is responsible for handling this call. 4655 * </p> 4656 * 4657 * @param info The instance to initialize. 4658 */ 4659 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4660 if (mAccessibilityDelegate != null) { 4661 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4662 } else { 4663 onInitializeAccessibilityNodeInfoInternal(info); 4664 } 4665 } 4666 4667 /** 4668 * Gets the location of this view in screen coordintates. 4669 * 4670 * @param outRect The output location 4671 */ 4672 private void getBoundsOnScreen(Rect outRect) { 4673 if (mAttachInfo == null) { 4674 return; 4675 } 4676 4677 RectF position = mAttachInfo.mTmpTransformRect; 4678 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4679 4680 if (!hasIdentityMatrix()) { 4681 getMatrix().mapRect(position); 4682 } 4683 4684 position.offset(mLeft, mTop); 4685 4686 ViewParent parent = mParent; 4687 while (parent instanceof View) { 4688 View parentView = (View) parent; 4689 4690 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4691 4692 if (!parentView.hasIdentityMatrix()) { 4693 parentView.getMatrix().mapRect(position); 4694 } 4695 4696 position.offset(parentView.mLeft, parentView.mTop); 4697 4698 parent = parentView.mParent; 4699 } 4700 4701 if (parent instanceof ViewRootImpl) { 4702 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4703 position.offset(0, -viewRootImpl.mCurScrollY); 4704 } 4705 4706 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4707 4708 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4709 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4710 } 4711 4712 /** 4713 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4714 * 4715 * Note: Called from the default {@link AccessibilityDelegate}. 4716 */ 4717 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4718 Rect bounds = mAttachInfo.mTmpInvalRect; 4719 getDrawingRect(bounds); 4720 info.setBoundsInParent(bounds); 4721 4722 getBoundsOnScreen(bounds); 4723 info.setBoundsInScreen(bounds); 4724 4725 ViewParent parent = getParentForAccessibility(); 4726 if (parent instanceof View) { 4727 info.setParent((View) parent); 4728 } 4729 4730 info.setVisibleToUser(isVisibleToUser()); 4731 4732 info.setPackageName(mContext.getPackageName()); 4733 info.setClassName(View.class.getName()); 4734 info.setContentDescription(getContentDescription()); 4735 4736 info.setEnabled(isEnabled()); 4737 info.setClickable(isClickable()); 4738 info.setFocusable(isFocusable()); 4739 info.setFocused(isFocused()); 4740 info.setAccessibilityFocused(isAccessibilityFocused()); 4741 info.setSelected(isSelected()); 4742 info.setLongClickable(isLongClickable()); 4743 4744 // TODO: These make sense only if we are in an AdapterView but all 4745 // views can be selected. Maybe from accessiiblity perspective 4746 // we should report as selectable view in an AdapterView. 4747 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4748 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4749 4750 if (isFocusable()) { 4751 if (isFocused()) { 4752 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4753 } else { 4754 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4755 } 4756 } 4757 4758 if (!isAccessibilityFocused()) { 4759 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4760 } else { 4761 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4762 } 4763 4764 if (isClickable()) { 4765 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4766 } 4767 4768 if (isLongClickable()) { 4769 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4770 } 4771 4772 if (mContentDescription != null && mContentDescription.length() > 0) { 4773 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4774 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4775 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4776 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4777 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4778 } 4779 } 4780 4781 /** 4782 * Computes whether this view is visible to the user. Such a view is 4783 * attached, visible, all its predecessors are visible, it is not clipped 4784 * entirely by its predecessors, and has an alpha greater than zero. 4785 * 4786 * @return Whether the view is visible on the screen. 4787 * 4788 * @hide 4789 */ 4790 protected boolean isVisibleToUser() { 4791 return isVisibleToUser(null); 4792 } 4793 4794 /** 4795 * Computes whether the given portion of this view is visible to the user. Such a view is 4796 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4797 * the specified portion is not clipped entirely by its predecessors. 4798 * 4799 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4800 * <code>null</code>, and the entire view will be tested in this case. 4801 * When <code>true</code> is returned by the function, the actual visible 4802 * region will be stored in this parameter; that is, if boundInView is fully 4803 * contained within the view, no modification will be made, otherwise regions 4804 * outside of the visible area of the view will be clipped. 4805 * 4806 * @return Whether the specified portion of the view is visible on the screen. 4807 * 4808 * @hide 4809 */ 4810 protected boolean isVisibleToUser(Rect boundInView) { 4811 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4812 Point offset = mAttachInfo.mPoint; 4813 // The first two checks are made also made by isShown() which 4814 // however traverses the tree up to the parent to catch that. 4815 // Therefore, we do some fail fast check to minimize the up 4816 // tree traversal. 4817 boolean isVisible = mAttachInfo != null 4818 && mAttachInfo.mWindowVisibility == View.VISIBLE 4819 && getAlpha() > 0 4820 && isShown() 4821 && getGlobalVisibleRect(visibleRect, offset); 4822 if (isVisible && boundInView != null) { 4823 visibleRect.offset(-offset.x, -offset.y); 4824 isVisible &= boundInView.intersect(visibleRect); 4825 } 4826 return isVisible; 4827 } 4828 4829 /** 4830 * Sets a delegate for implementing accessibility support via compositon as 4831 * opposed to inheritance. The delegate's primary use is for implementing 4832 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4833 * 4834 * @param delegate The delegate instance. 4835 * 4836 * @see AccessibilityDelegate 4837 */ 4838 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4839 mAccessibilityDelegate = delegate; 4840 } 4841 4842 /** 4843 * Gets the provider for managing a virtual view hierarchy rooted at this View 4844 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4845 * that explore the window content. 4846 * <p> 4847 * If this method returns an instance, this instance is responsible for managing 4848 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4849 * View including the one representing the View itself. Similarly the returned 4850 * instance is responsible for performing accessibility actions on any virtual 4851 * view or the root view itself. 4852 * </p> 4853 * <p> 4854 * If an {@link AccessibilityDelegate} has been specified via calling 4855 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4856 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4857 * is responsible for handling this call. 4858 * </p> 4859 * 4860 * @return The provider. 4861 * 4862 * @see AccessibilityNodeProvider 4863 */ 4864 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4865 if (mAccessibilityDelegate != null) { 4866 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4867 } else { 4868 return null; 4869 } 4870 } 4871 4872 /** 4873 * Gets the unique identifier of this view on the screen for accessibility purposes. 4874 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4875 * 4876 * @return The view accessibility id. 4877 * 4878 * @hide 4879 */ 4880 public int getAccessibilityViewId() { 4881 if (mAccessibilityViewId == NO_ID) { 4882 mAccessibilityViewId = sNextAccessibilityViewId++; 4883 } 4884 return mAccessibilityViewId; 4885 } 4886 4887 /** 4888 * Gets the unique identifier of the window in which this View reseides. 4889 * 4890 * @return The window accessibility id. 4891 * 4892 * @hide 4893 */ 4894 public int getAccessibilityWindowId() { 4895 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4896 } 4897 4898 /** 4899 * Gets the {@link View} description. It briefly describes the view and is 4900 * primarily used for accessibility support. Set this property to enable 4901 * better accessibility support for your application. This is especially 4902 * true for views that do not have textual representation (For example, 4903 * ImageButton). 4904 * 4905 * @return The content description. 4906 * 4907 * @attr ref android.R.styleable#View_contentDescription 4908 */ 4909 @ViewDebug.ExportedProperty(category = "accessibility") 4910 public CharSequence getContentDescription() { 4911 return mContentDescription; 4912 } 4913 4914 /** 4915 * Sets the {@link View} description. It briefly describes the view and is 4916 * primarily used for accessibility support. Set this property to enable 4917 * better accessibility support for your application. This is especially 4918 * true for views that do not have textual representation (For example, 4919 * ImageButton). 4920 * 4921 * @param contentDescription The content description. 4922 * 4923 * @attr ref android.R.styleable#View_contentDescription 4924 */ 4925 @RemotableViewMethod 4926 public void setContentDescription(CharSequence contentDescription) { 4927 mContentDescription = contentDescription; 4928 } 4929 4930 /** 4931 * Invoked whenever this view loses focus, either by losing window focus or by losing 4932 * focus within its window. This method can be used to clear any state tied to the 4933 * focus. For instance, if a button is held pressed with the trackball and the window 4934 * loses focus, this method can be used to cancel the press. 4935 * 4936 * Subclasses of View overriding this method should always call super.onFocusLost(). 4937 * 4938 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4939 * @see #onWindowFocusChanged(boolean) 4940 * 4941 * @hide pending API council approval 4942 */ 4943 protected void onFocusLost() { 4944 resetPressedState(); 4945 } 4946 4947 private void resetPressedState() { 4948 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4949 return; 4950 } 4951 4952 if (isPressed()) { 4953 setPressed(false); 4954 4955 if (!mHasPerformedLongPress) { 4956 removeLongPressCallback(); 4957 } 4958 } 4959 } 4960 4961 /** 4962 * Returns true if this view has focus 4963 * 4964 * @return True if this view has focus, false otherwise. 4965 */ 4966 @ViewDebug.ExportedProperty(category = "focus") 4967 public boolean isFocused() { 4968 return (mPrivateFlags & FOCUSED) != 0; 4969 } 4970 4971 /** 4972 * Find the view in the hierarchy rooted at this view that currently has 4973 * focus. 4974 * 4975 * @return The view that currently has focus, or null if no focused view can 4976 * be found. 4977 */ 4978 public View findFocus() { 4979 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4980 } 4981 4982 /** 4983 * Indicates whether this view is one of the set of scrollable containers in 4984 * its window. 4985 * 4986 * @return whether this view is one of the set of scrollable containers in 4987 * its window 4988 * 4989 * @attr ref android.R.styleable#View_isScrollContainer 4990 */ 4991 public boolean isScrollContainer() { 4992 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4993 } 4994 4995 /** 4996 * Change whether this view is one of the set of scrollable containers in 4997 * its window. This will be used to determine whether the window can 4998 * resize or must pan when a soft input area is open -- scrollable 4999 * containers allow the window to use resize mode since the container 5000 * will appropriately shrink. 5001 * 5002 * @attr ref android.R.styleable#View_isScrollContainer 5003 */ 5004 public void setScrollContainer(boolean isScrollContainer) { 5005 if (isScrollContainer) { 5006 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5007 mAttachInfo.mScrollContainers.add(this); 5008 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5009 } 5010 mPrivateFlags |= SCROLL_CONTAINER; 5011 } else { 5012 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5013 mAttachInfo.mScrollContainers.remove(this); 5014 } 5015 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5016 } 5017 } 5018 5019 /** 5020 * Returns the quality of the drawing cache. 5021 * 5022 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5023 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5024 * 5025 * @see #setDrawingCacheQuality(int) 5026 * @see #setDrawingCacheEnabled(boolean) 5027 * @see #isDrawingCacheEnabled() 5028 * 5029 * @attr ref android.R.styleable#View_drawingCacheQuality 5030 */ 5031 public int getDrawingCacheQuality() { 5032 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5033 } 5034 5035 /** 5036 * Set the drawing cache quality of this view. This value is used only when the 5037 * drawing cache is enabled 5038 * 5039 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5040 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5041 * 5042 * @see #getDrawingCacheQuality() 5043 * @see #setDrawingCacheEnabled(boolean) 5044 * @see #isDrawingCacheEnabled() 5045 * 5046 * @attr ref android.R.styleable#View_drawingCacheQuality 5047 */ 5048 public void setDrawingCacheQuality(int quality) { 5049 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5050 } 5051 5052 /** 5053 * Returns whether the screen should remain on, corresponding to the current 5054 * value of {@link #KEEP_SCREEN_ON}. 5055 * 5056 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5057 * 5058 * @see #setKeepScreenOn(boolean) 5059 * 5060 * @attr ref android.R.styleable#View_keepScreenOn 5061 */ 5062 public boolean getKeepScreenOn() { 5063 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5064 } 5065 5066 /** 5067 * Controls whether the screen should remain on, modifying the 5068 * value of {@link #KEEP_SCREEN_ON}. 5069 * 5070 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5071 * 5072 * @see #getKeepScreenOn() 5073 * 5074 * @attr ref android.R.styleable#View_keepScreenOn 5075 */ 5076 public void setKeepScreenOn(boolean keepScreenOn) { 5077 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5078 } 5079 5080 /** 5081 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5082 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5083 * 5084 * @attr ref android.R.styleable#View_nextFocusLeft 5085 */ 5086 public int getNextFocusLeftId() { 5087 return mNextFocusLeftId; 5088 } 5089 5090 /** 5091 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5092 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5093 * decide automatically. 5094 * 5095 * @attr ref android.R.styleable#View_nextFocusLeft 5096 */ 5097 public void setNextFocusLeftId(int nextFocusLeftId) { 5098 mNextFocusLeftId = nextFocusLeftId; 5099 } 5100 5101 /** 5102 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5103 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5104 * 5105 * @attr ref android.R.styleable#View_nextFocusRight 5106 */ 5107 public int getNextFocusRightId() { 5108 return mNextFocusRightId; 5109 } 5110 5111 /** 5112 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5113 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5114 * decide automatically. 5115 * 5116 * @attr ref android.R.styleable#View_nextFocusRight 5117 */ 5118 public void setNextFocusRightId(int nextFocusRightId) { 5119 mNextFocusRightId = nextFocusRightId; 5120 } 5121 5122 /** 5123 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5124 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5125 * 5126 * @attr ref android.R.styleable#View_nextFocusUp 5127 */ 5128 public int getNextFocusUpId() { 5129 return mNextFocusUpId; 5130 } 5131 5132 /** 5133 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5134 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5135 * decide automatically. 5136 * 5137 * @attr ref android.R.styleable#View_nextFocusUp 5138 */ 5139 public void setNextFocusUpId(int nextFocusUpId) { 5140 mNextFocusUpId = nextFocusUpId; 5141 } 5142 5143 /** 5144 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5145 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5146 * 5147 * @attr ref android.R.styleable#View_nextFocusDown 5148 */ 5149 public int getNextFocusDownId() { 5150 return mNextFocusDownId; 5151 } 5152 5153 /** 5154 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5155 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5156 * decide automatically. 5157 * 5158 * @attr ref android.R.styleable#View_nextFocusDown 5159 */ 5160 public void setNextFocusDownId(int nextFocusDownId) { 5161 mNextFocusDownId = nextFocusDownId; 5162 } 5163 5164 /** 5165 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5166 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5167 * 5168 * @attr ref android.R.styleable#View_nextFocusForward 5169 */ 5170 public int getNextFocusForwardId() { 5171 return mNextFocusForwardId; 5172 } 5173 5174 /** 5175 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5176 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5177 * decide automatically. 5178 * 5179 * @attr ref android.R.styleable#View_nextFocusForward 5180 */ 5181 public void setNextFocusForwardId(int nextFocusForwardId) { 5182 mNextFocusForwardId = nextFocusForwardId; 5183 } 5184 5185 /** 5186 * Returns the visibility of this view and all of its ancestors 5187 * 5188 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5189 */ 5190 public boolean isShown() { 5191 View current = this; 5192 //noinspection ConstantConditions 5193 do { 5194 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5195 return false; 5196 } 5197 ViewParent parent = current.mParent; 5198 if (parent == null) { 5199 return false; // We are not attached to the view root 5200 } 5201 if (!(parent instanceof View)) { 5202 return true; 5203 } 5204 current = (View) parent; 5205 } while (current != null); 5206 5207 return false; 5208 } 5209 5210 /** 5211 * Called by the view hierarchy when the content insets for a window have 5212 * changed, to allow it to adjust its content to fit within those windows. 5213 * The content insets tell you the space that the status bar, input method, 5214 * and other system windows infringe on the application's window. 5215 * 5216 * <p>You do not normally need to deal with this function, since the default 5217 * window decoration given to applications takes care of applying it to the 5218 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5219 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5220 * and your content can be placed under those system elements. You can then 5221 * use this method within your view hierarchy if you have parts of your UI 5222 * which you would like to ensure are not being covered. 5223 * 5224 * <p>The default implementation of this method simply applies the content 5225 * inset's to the view's padding. This can be enabled through 5226 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5227 * the method and handle the insets however you would like. Note that the 5228 * insets provided by the framework are always relative to the far edges 5229 * of the window, not accounting for the location of the called view within 5230 * that window. (In fact when this method is called you do not yet know 5231 * where the layout will place the view, as it is done before layout happens.) 5232 * 5233 * <p>Note: unlike many View methods, there is no dispatch phase to this 5234 * call. If you are overriding it in a ViewGroup and want to allow the 5235 * call to continue to your children, you must be sure to call the super 5236 * implementation. 5237 * 5238 * <p>Here is a sample layout that makes use of fitting system windows 5239 * to have controls for a video view placed inside of the window decorations 5240 * that it hides and shows. This can be used with code like the second 5241 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5242 * 5243 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5244 * 5245 * @param insets Current content insets of the window. Prior to 5246 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5247 * the insets or else you and Android will be unhappy. 5248 * 5249 * @return Return true if this view applied the insets and it should not 5250 * continue propagating further down the hierarchy, false otherwise. 5251 */ 5252 protected boolean fitSystemWindows(Rect insets) { 5253 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5254 mUserPaddingStart = -1; 5255 mUserPaddingEnd = -1; 5256 mUserPaddingRelative = false; 5257 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5258 || mAttachInfo == null 5259 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5260 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5261 return true; 5262 } else { 5263 internalSetPadding(0, 0, 0, 0); 5264 return false; 5265 } 5266 } 5267 return false; 5268 } 5269 5270 /** 5271 * Set whether or not this view should account for system screen decorations 5272 * such as the status bar and inset its content. This allows this view to be 5273 * positioned in absolute screen coordinates and remain visible to the user. 5274 * 5275 * <p>This should only be used by top-level window decor views. 5276 * 5277 * @param fitSystemWindows true to inset content for system screen decorations, false for 5278 * default behavior. 5279 * 5280 * @attr ref android.R.styleable#View_fitsSystemWindows 5281 */ 5282 public void setFitsSystemWindows(boolean fitSystemWindows) { 5283 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5284 } 5285 5286 /** 5287 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5288 * returns true, this view 5289 * will account for system screen decorations such as the status bar and inset its 5290 * content. This allows the view to be positioned in absolute screen coordinates 5291 * and remain visible to the user. 5292 * 5293 * @return true if this view will adjust its content bounds for system screen decorations. 5294 * 5295 * @attr ref android.R.styleable#View_fitsSystemWindows 5296 */ 5297 public boolean getFitsSystemWindows() { 5298 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5299 } 5300 5301 /** @hide */ 5302 public boolean fitsSystemWindows() { 5303 return getFitsSystemWindows(); 5304 } 5305 5306 /** 5307 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5308 */ 5309 public void requestFitSystemWindows() { 5310 if (mParent != null) { 5311 mParent.requestFitSystemWindows(); 5312 } 5313 } 5314 5315 /** 5316 * For use by PhoneWindow to make its own system window fitting optional. 5317 * @hide 5318 */ 5319 public void makeOptionalFitsSystemWindows() { 5320 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5321 } 5322 5323 /** 5324 * Returns the visibility status for this view. 5325 * 5326 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5327 * @attr ref android.R.styleable#View_visibility 5328 */ 5329 @ViewDebug.ExportedProperty(mapping = { 5330 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5331 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5332 @ViewDebug.IntToString(from = GONE, to = "GONE") 5333 }) 5334 public int getVisibility() { 5335 return mViewFlags & VISIBILITY_MASK; 5336 } 5337 5338 /** 5339 * Set the enabled state of this view. 5340 * 5341 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5342 * @attr ref android.R.styleable#View_visibility 5343 */ 5344 @RemotableViewMethod 5345 public void setVisibility(int visibility) { 5346 setFlags(visibility, VISIBILITY_MASK); 5347 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5348 } 5349 5350 /** 5351 * Returns the enabled status for this view. The interpretation of the 5352 * enabled state varies by subclass. 5353 * 5354 * @return True if this view is enabled, false otherwise. 5355 */ 5356 @ViewDebug.ExportedProperty 5357 public boolean isEnabled() { 5358 return (mViewFlags & ENABLED_MASK) == ENABLED; 5359 } 5360 5361 /** 5362 * Set the enabled state of this view. The interpretation of the enabled 5363 * state varies by subclass. 5364 * 5365 * @param enabled True if this view is enabled, false otherwise. 5366 */ 5367 @RemotableViewMethod 5368 public void setEnabled(boolean enabled) { 5369 if (enabled == isEnabled()) return; 5370 5371 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5372 5373 /* 5374 * The View most likely has to change its appearance, so refresh 5375 * the drawable state. 5376 */ 5377 refreshDrawableState(); 5378 5379 // Invalidate too, since the default behavior for views is to be 5380 // be drawn at 50% alpha rather than to change the drawable. 5381 invalidate(true); 5382 } 5383 5384 /** 5385 * Set whether this view can receive the focus. 5386 * 5387 * Setting this to false will also ensure that this view is not focusable 5388 * in touch mode. 5389 * 5390 * @param focusable If true, this view can receive the focus. 5391 * 5392 * @see #setFocusableInTouchMode(boolean) 5393 * @attr ref android.R.styleable#View_focusable 5394 */ 5395 public void setFocusable(boolean focusable) { 5396 if (!focusable) { 5397 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5398 } 5399 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5400 } 5401 5402 /** 5403 * Set whether this view can receive focus while in touch mode. 5404 * 5405 * Setting this to true will also ensure that this view is focusable. 5406 * 5407 * @param focusableInTouchMode If true, this view can receive the focus while 5408 * in touch mode. 5409 * 5410 * @see #setFocusable(boolean) 5411 * @attr ref android.R.styleable#View_focusableInTouchMode 5412 */ 5413 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5414 // Focusable in touch mode should always be set before the focusable flag 5415 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5416 // which, in touch mode, will not successfully request focus on this view 5417 // because the focusable in touch mode flag is not set 5418 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5419 if (focusableInTouchMode) { 5420 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5421 } 5422 } 5423 5424 /** 5425 * Set whether this view should have sound effects enabled for events such as 5426 * clicking and touching. 5427 * 5428 * <p>You may wish to disable sound effects for a view if you already play sounds, 5429 * for instance, a dial key that plays dtmf tones. 5430 * 5431 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5432 * @see #isSoundEffectsEnabled() 5433 * @see #playSoundEffect(int) 5434 * @attr ref android.R.styleable#View_soundEffectsEnabled 5435 */ 5436 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5437 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5438 } 5439 5440 /** 5441 * @return whether this view should have sound effects enabled for events such as 5442 * clicking and touching. 5443 * 5444 * @see #setSoundEffectsEnabled(boolean) 5445 * @see #playSoundEffect(int) 5446 * @attr ref android.R.styleable#View_soundEffectsEnabled 5447 */ 5448 @ViewDebug.ExportedProperty 5449 public boolean isSoundEffectsEnabled() { 5450 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5451 } 5452 5453 /** 5454 * Set whether this view should have haptic feedback for events such as 5455 * long presses. 5456 * 5457 * <p>You may wish to disable haptic feedback if your view already controls 5458 * its own haptic feedback. 5459 * 5460 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5461 * @see #isHapticFeedbackEnabled() 5462 * @see #performHapticFeedback(int) 5463 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5464 */ 5465 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5466 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5467 } 5468 5469 /** 5470 * @return whether this view should have haptic feedback enabled for events 5471 * long presses. 5472 * 5473 * @see #setHapticFeedbackEnabled(boolean) 5474 * @see #performHapticFeedback(int) 5475 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5476 */ 5477 @ViewDebug.ExportedProperty 5478 public boolean isHapticFeedbackEnabled() { 5479 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5480 } 5481 5482 /** 5483 * Returns the layout direction for this view. 5484 * 5485 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5486 * {@link #LAYOUT_DIRECTION_RTL}, 5487 * {@link #LAYOUT_DIRECTION_INHERIT} or 5488 * {@link #LAYOUT_DIRECTION_LOCALE}. 5489 * @attr ref android.R.styleable#View_layoutDirection 5490 */ 5491 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5492 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5493 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5494 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5495 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5496 }) 5497 public int getLayoutDirection() { 5498 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5499 } 5500 5501 /** 5502 * Set the layout direction for this view. This will propagate a reset of layout direction 5503 * resolution to the view's children and resolve layout direction for this view. 5504 * 5505 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5506 * {@link #LAYOUT_DIRECTION_RTL}, 5507 * {@link #LAYOUT_DIRECTION_INHERIT} or 5508 * {@link #LAYOUT_DIRECTION_LOCALE}. 5509 * 5510 * @attr ref android.R.styleable#View_layoutDirection 5511 */ 5512 @RemotableViewMethod 5513 public void setLayoutDirection(int layoutDirection) { 5514 if (getLayoutDirection() != layoutDirection) { 5515 // Reset the current layout direction and the resolved one 5516 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5517 resetResolvedLayoutDirection(); 5518 // Set the new layout direction (filtered) and ask for a layout pass 5519 mPrivateFlags2 |= 5520 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5521 requestLayout(); 5522 } 5523 } 5524 5525 /** 5526 * Returns the resolved layout direction for this view. 5527 * 5528 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5529 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5530 */ 5531 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5532 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5533 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5534 }) 5535 public int getResolvedLayoutDirection() { 5536 // The layout diretion will be resolved only if needed 5537 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5538 resolveLayoutDirection(); 5539 } 5540 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5541 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5542 } 5543 5544 /** 5545 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5546 * layout attribute and/or the inherited value from the parent 5547 * 5548 * @return true if the layout is right-to-left. 5549 */ 5550 @ViewDebug.ExportedProperty(category = "layout") 5551 public boolean isLayoutRtl() { 5552 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5553 } 5554 5555 /** 5556 * Indicates whether the view is currently tracking transient state that the 5557 * app should not need to concern itself with saving and restoring, but that 5558 * the framework should take special note to preserve when possible. 5559 * 5560 * <p>A view with transient state cannot be trivially rebound from an external 5561 * data source, such as an adapter binding item views in a list. This may be 5562 * because the view is performing an animation, tracking user selection 5563 * of content, or similar.</p> 5564 * 5565 * @return true if the view has transient state 5566 */ 5567 @ViewDebug.ExportedProperty(category = "layout") 5568 public boolean hasTransientState() { 5569 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5570 } 5571 5572 /** 5573 * Set whether this view is currently tracking transient state that the 5574 * framework should attempt to preserve when possible. This flag is reference counted, 5575 * so every call to setHasTransientState(true) should be paired with a later call 5576 * to setHasTransientState(false). 5577 * 5578 * <p>A view with transient state cannot be trivially rebound from an external 5579 * data source, such as an adapter binding item views in a list. This may be 5580 * because the view is performing an animation, tracking user selection 5581 * of content, or similar.</p> 5582 * 5583 * @param hasTransientState true if this view has transient state 5584 */ 5585 public void setHasTransientState(boolean hasTransientState) { 5586 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5587 mTransientStateCount - 1; 5588 if (mTransientStateCount < 0) { 5589 mTransientStateCount = 0; 5590 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5591 "unmatched pair of setHasTransientState calls"); 5592 } 5593 if ((hasTransientState && mTransientStateCount == 1) || 5594 (!hasTransientState && mTransientStateCount == 0)) { 5595 // update flag if we've just incremented up from 0 or decremented down to 0 5596 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5597 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5598 if (mParent != null) { 5599 try { 5600 mParent.childHasTransientStateChanged(this, hasTransientState); 5601 } catch (AbstractMethodError e) { 5602 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5603 " does not fully implement ViewParent", e); 5604 } 5605 } 5606 } 5607 } 5608 5609 /** 5610 * If this view doesn't do any drawing on its own, set this flag to 5611 * allow further optimizations. By default, this flag is not set on 5612 * View, but could be set on some View subclasses such as ViewGroup. 5613 * 5614 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5615 * you should clear this flag. 5616 * 5617 * @param willNotDraw whether or not this View draw on its own 5618 */ 5619 public void setWillNotDraw(boolean willNotDraw) { 5620 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5621 } 5622 5623 /** 5624 * Returns whether or not this View draws on its own. 5625 * 5626 * @return true if this view has nothing to draw, false otherwise 5627 */ 5628 @ViewDebug.ExportedProperty(category = "drawing") 5629 public boolean willNotDraw() { 5630 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5631 } 5632 5633 /** 5634 * When a View's drawing cache is enabled, drawing is redirected to an 5635 * offscreen bitmap. Some views, like an ImageView, must be able to 5636 * bypass this mechanism if they already draw a single bitmap, to avoid 5637 * unnecessary usage of the memory. 5638 * 5639 * @param willNotCacheDrawing true if this view does not cache its 5640 * drawing, false otherwise 5641 */ 5642 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5643 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5644 } 5645 5646 /** 5647 * Returns whether or not this View can cache its drawing or not. 5648 * 5649 * @return true if this view does not cache its drawing, false otherwise 5650 */ 5651 @ViewDebug.ExportedProperty(category = "drawing") 5652 public boolean willNotCacheDrawing() { 5653 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5654 } 5655 5656 /** 5657 * Indicates whether this view reacts to click events or not. 5658 * 5659 * @return true if the view is clickable, false otherwise 5660 * 5661 * @see #setClickable(boolean) 5662 * @attr ref android.R.styleable#View_clickable 5663 */ 5664 @ViewDebug.ExportedProperty 5665 public boolean isClickable() { 5666 return (mViewFlags & CLICKABLE) == CLICKABLE; 5667 } 5668 5669 /** 5670 * Enables or disables click events for this view. When a view 5671 * is clickable it will change its state to "pressed" on every click. 5672 * Subclasses should set the view clickable to visually react to 5673 * user's clicks. 5674 * 5675 * @param clickable true to make the view clickable, false otherwise 5676 * 5677 * @see #isClickable() 5678 * @attr ref android.R.styleable#View_clickable 5679 */ 5680 public void setClickable(boolean clickable) { 5681 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5682 } 5683 5684 /** 5685 * Indicates whether this view reacts to long click events or not. 5686 * 5687 * @return true if the view is long clickable, false otherwise 5688 * 5689 * @see #setLongClickable(boolean) 5690 * @attr ref android.R.styleable#View_longClickable 5691 */ 5692 public boolean isLongClickable() { 5693 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5694 } 5695 5696 /** 5697 * Enables or disables long click events for this view. When a view is long 5698 * clickable it reacts to the user holding down the button for a longer 5699 * duration than a tap. This event can either launch the listener or a 5700 * context menu. 5701 * 5702 * @param longClickable true to make the view long clickable, false otherwise 5703 * @see #isLongClickable() 5704 * @attr ref android.R.styleable#View_longClickable 5705 */ 5706 public void setLongClickable(boolean longClickable) { 5707 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5708 } 5709 5710 /** 5711 * Sets the pressed state for this view. 5712 * 5713 * @see #isClickable() 5714 * @see #setClickable(boolean) 5715 * 5716 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5717 * the View's internal state from a previously set "pressed" state. 5718 */ 5719 public void setPressed(boolean pressed) { 5720 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5721 5722 if (pressed) { 5723 mPrivateFlags |= PRESSED; 5724 } else { 5725 mPrivateFlags &= ~PRESSED; 5726 } 5727 5728 if (needsRefresh) { 5729 refreshDrawableState(); 5730 } 5731 dispatchSetPressed(pressed); 5732 } 5733 5734 /** 5735 * Dispatch setPressed to all of this View's children. 5736 * 5737 * @see #setPressed(boolean) 5738 * 5739 * @param pressed The new pressed state 5740 */ 5741 protected void dispatchSetPressed(boolean pressed) { 5742 } 5743 5744 /** 5745 * Indicates whether the view is currently in pressed state. Unless 5746 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5747 * the pressed state. 5748 * 5749 * @see #setPressed(boolean) 5750 * @see #isClickable() 5751 * @see #setClickable(boolean) 5752 * 5753 * @return true if the view is currently pressed, false otherwise 5754 */ 5755 public boolean isPressed() { 5756 return (mPrivateFlags & PRESSED) == PRESSED; 5757 } 5758 5759 /** 5760 * Indicates whether this view will save its state (that is, 5761 * whether its {@link #onSaveInstanceState} method will be called). 5762 * 5763 * @return Returns true if the view state saving is enabled, else false. 5764 * 5765 * @see #setSaveEnabled(boolean) 5766 * @attr ref android.R.styleable#View_saveEnabled 5767 */ 5768 public boolean isSaveEnabled() { 5769 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5770 } 5771 5772 /** 5773 * Controls whether the saving of this view's state is 5774 * enabled (that is, whether its {@link #onSaveInstanceState} method 5775 * will be called). Note that even if freezing is enabled, the 5776 * view still must have an id assigned to it (via {@link #setId(int)}) 5777 * for its state to be saved. This flag can only disable the 5778 * saving of this view; any child views may still have their state saved. 5779 * 5780 * @param enabled Set to false to <em>disable</em> state saving, or true 5781 * (the default) to allow it. 5782 * 5783 * @see #isSaveEnabled() 5784 * @see #setId(int) 5785 * @see #onSaveInstanceState() 5786 * @attr ref android.R.styleable#View_saveEnabled 5787 */ 5788 public void setSaveEnabled(boolean enabled) { 5789 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5790 } 5791 5792 /** 5793 * Gets whether the framework should discard touches when the view's 5794 * window is obscured by another visible window. 5795 * Refer to the {@link View} security documentation for more details. 5796 * 5797 * @return True if touch filtering is enabled. 5798 * 5799 * @see #setFilterTouchesWhenObscured(boolean) 5800 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5801 */ 5802 @ViewDebug.ExportedProperty 5803 public boolean getFilterTouchesWhenObscured() { 5804 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5805 } 5806 5807 /** 5808 * Sets whether the framework should discard touches when the view's 5809 * window is obscured by another visible window. 5810 * Refer to the {@link View} security documentation for more details. 5811 * 5812 * @param enabled True if touch filtering should be enabled. 5813 * 5814 * @see #getFilterTouchesWhenObscured 5815 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5816 */ 5817 public void setFilterTouchesWhenObscured(boolean enabled) { 5818 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5819 FILTER_TOUCHES_WHEN_OBSCURED); 5820 } 5821 5822 /** 5823 * Indicates whether the entire hierarchy under this view will save its 5824 * state when a state saving traversal occurs from its parent. The default 5825 * is true; if false, these views will not be saved unless 5826 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5827 * 5828 * @return Returns true if the view state saving from parent is enabled, else false. 5829 * 5830 * @see #setSaveFromParentEnabled(boolean) 5831 */ 5832 public boolean isSaveFromParentEnabled() { 5833 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5834 } 5835 5836 /** 5837 * Controls whether the entire hierarchy under this view will save its 5838 * state when a state saving traversal occurs from its parent. The default 5839 * is true; if false, these views will not be saved unless 5840 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5841 * 5842 * @param enabled Set to false to <em>disable</em> state saving, or true 5843 * (the default) to allow it. 5844 * 5845 * @see #isSaveFromParentEnabled() 5846 * @see #setId(int) 5847 * @see #onSaveInstanceState() 5848 */ 5849 public void setSaveFromParentEnabled(boolean enabled) { 5850 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5851 } 5852 5853 5854 /** 5855 * Returns whether this View is able to take focus. 5856 * 5857 * @return True if this view can take focus, or false otherwise. 5858 * @attr ref android.R.styleable#View_focusable 5859 */ 5860 @ViewDebug.ExportedProperty(category = "focus") 5861 public final boolean isFocusable() { 5862 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5863 } 5864 5865 /** 5866 * When a view is focusable, it may not want to take focus when in touch mode. 5867 * For example, a button would like focus when the user is navigating via a D-pad 5868 * so that the user can click on it, but once the user starts touching the screen, 5869 * the button shouldn't take focus 5870 * @return Whether the view is focusable in touch mode. 5871 * @attr ref android.R.styleable#View_focusableInTouchMode 5872 */ 5873 @ViewDebug.ExportedProperty 5874 public final boolean isFocusableInTouchMode() { 5875 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5876 } 5877 5878 /** 5879 * Find the nearest view in the specified direction that can take focus. 5880 * This does not actually give focus to that view. 5881 * 5882 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5883 * 5884 * @return The nearest focusable in the specified direction, or null if none 5885 * can be found. 5886 */ 5887 public View focusSearch(int direction) { 5888 if (mParent != null) { 5889 return mParent.focusSearch(this, direction); 5890 } else { 5891 return null; 5892 } 5893 } 5894 5895 /** 5896 * This method is the last chance for the focused view and its ancestors to 5897 * respond to an arrow key. This is called when the focused view did not 5898 * consume the key internally, nor could the view system find a new view in 5899 * the requested direction to give focus to. 5900 * 5901 * @param focused The currently focused view. 5902 * @param direction The direction focus wants to move. One of FOCUS_UP, 5903 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5904 * @return True if the this view consumed this unhandled move. 5905 */ 5906 public boolean dispatchUnhandledMove(View focused, int direction) { 5907 return false; 5908 } 5909 5910 /** 5911 * If a user manually specified the next view id for a particular direction, 5912 * use the root to look up the view. 5913 * @param root The root view of the hierarchy containing this view. 5914 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5915 * or FOCUS_BACKWARD. 5916 * @return The user specified next view, or null if there is none. 5917 */ 5918 View findUserSetNextFocus(View root, int direction) { 5919 switch (direction) { 5920 case FOCUS_LEFT: 5921 if (mNextFocusLeftId == View.NO_ID) return null; 5922 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5923 case FOCUS_RIGHT: 5924 if (mNextFocusRightId == View.NO_ID) return null; 5925 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5926 case FOCUS_UP: 5927 if (mNextFocusUpId == View.NO_ID) return null; 5928 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5929 case FOCUS_DOWN: 5930 if (mNextFocusDownId == View.NO_ID) return null; 5931 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5932 case FOCUS_FORWARD: 5933 if (mNextFocusForwardId == View.NO_ID) return null; 5934 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5935 case FOCUS_BACKWARD: { 5936 if (mID == View.NO_ID) return null; 5937 final int id = mID; 5938 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5939 @Override 5940 public boolean apply(View t) { 5941 return t.mNextFocusForwardId == id; 5942 } 5943 }); 5944 } 5945 } 5946 return null; 5947 } 5948 5949 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5950 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5951 @Override 5952 public boolean apply(View t) { 5953 return t.mID == childViewId; 5954 } 5955 }); 5956 5957 if (result == null) { 5958 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5959 + "by user for id " + childViewId); 5960 } 5961 return result; 5962 } 5963 5964 /** 5965 * Find and return all focusable views that are descendants of this view, 5966 * possibly including this view if it is focusable itself. 5967 * 5968 * @param direction The direction of the focus 5969 * @return A list of focusable views 5970 */ 5971 public ArrayList<View> getFocusables(int direction) { 5972 ArrayList<View> result = new ArrayList<View>(24); 5973 addFocusables(result, direction); 5974 return result; 5975 } 5976 5977 /** 5978 * Add any focusable views that are descendants of this view (possibly 5979 * including this view if it is focusable itself) to views. If we are in touch mode, 5980 * only add views that are also focusable in touch mode. 5981 * 5982 * @param views Focusable views found so far 5983 * @param direction The direction of the focus 5984 */ 5985 public void addFocusables(ArrayList<View> views, int direction) { 5986 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5987 } 5988 5989 /** 5990 * Adds any focusable views that are descendants of this view (possibly 5991 * including this view if it is focusable itself) to views. This method 5992 * adds all focusable views regardless if we are in touch mode or 5993 * only views focusable in touch mode if we are in touch mode or 5994 * only views that can take accessibility focus if accessibility is enabeld 5995 * depending on the focusable mode paramater. 5996 * 5997 * @param views Focusable views found so far or null if all we are interested is 5998 * the number of focusables. 5999 * @param direction The direction of the focus. 6000 * @param focusableMode The type of focusables to be added. 6001 * 6002 * @see #FOCUSABLES_ALL 6003 * @see #FOCUSABLES_TOUCH_MODE 6004 */ 6005 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6006 if (views == null) { 6007 return; 6008 } 6009 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6010 if (canTakeAccessibilityFocusFromHover() || getAccessibilityNodeProvider() != null) { 6011 views.add(this); 6012 return; 6013 } 6014 } 6015 if (!isFocusable()) { 6016 return; 6017 } 6018 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6019 && isInTouchMode() && !isFocusableInTouchMode()) { 6020 return; 6021 } 6022 views.add(this); 6023 } 6024 6025 /** 6026 * Finds the Views that contain given text. The containment is case insensitive. 6027 * The search is performed by either the text that the View renders or the content 6028 * description that describes the view for accessibility purposes and the view does 6029 * not render or both. Clients can specify how the search is to be performed via 6030 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6031 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6032 * 6033 * @param outViews The output list of matching Views. 6034 * @param searched The text to match against. 6035 * 6036 * @see #FIND_VIEWS_WITH_TEXT 6037 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6038 * @see #setContentDescription(CharSequence) 6039 */ 6040 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6041 if (getAccessibilityNodeProvider() != null) { 6042 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6043 outViews.add(this); 6044 } 6045 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6046 && (searched != null && searched.length() > 0) 6047 && (mContentDescription != null && mContentDescription.length() > 0)) { 6048 String searchedLowerCase = searched.toString().toLowerCase(); 6049 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6050 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6051 outViews.add(this); 6052 } 6053 } 6054 } 6055 6056 /** 6057 * Find and return all touchable views that are descendants of this view, 6058 * possibly including this view if it is touchable itself. 6059 * 6060 * @return A list of touchable views 6061 */ 6062 public ArrayList<View> getTouchables() { 6063 ArrayList<View> result = new ArrayList<View>(); 6064 addTouchables(result); 6065 return result; 6066 } 6067 6068 /** 6069 * Add any touchable views that are descendants of this view (possibly 6070 * including this view if it is touchable itself) to views. 6071 * 6072 * @param views Touchable views found so far 6073 */ 6074 public void addTouchables(ArrayList<View> views) { 6075 final int viewFlags = mViewFlags; 6076 6077 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6078 && (viewFlags & ENABLED_MASK) == ENABLED) { 6079 views.add(this); 6080 } 6081 } 6082 6083 /** 6084 * Returns whether this View is accessibility focused. 6085 * 6086 * @return True if this View is accessibility focused. 6087 */ 6088 boolean isAccessibilityFocused() { 6089 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6090 } 6091 6092 /** 6093 * Call this to try to give accessibility focus to this view. 6094 * 6095 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6096 * returns false or the view is no visible or the view already has accessibility 6097 * focus. 6098 * 6099 * See also {@link #focusSearch(int)}, which is what you call to say that you 6100 * have focus, and you want your parent to look for the next one. 6101 * 6102 * @return Whether this view actually took accessibility focus. 6103 * 6104 * @hide 6105 */ 6106 public boolean requestAccessibilityFocus() { 6107 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6108 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6109 return false; 6110 } 6111 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6112 return false; 6113 } 6114 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6115 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6116 ViewRootImpl viewRootImpl = getViewRootImpl(); 6117 if (viewRootImpl != null) { 6118 viewRootImpl.setAccessibilityFocusedHost(this); 6119 } 6120 invalidate(); 6121 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6122 notifyAccessibilityStateChanged(); 6123 // Try to give input focus to this view - not a descendant. 6124 requestFocusNoSearch(View.FOCUS_DOWN, null); 6125 return true; 6126 } 6127 return false; 6128 } 6129 6130 /** 6131 * Call this to try to clear accessibility focus of this view. 6132 * 6133 * See also {@link #focusSearch(int)}, which is what you call to say that you 6134 * have focus, and you want your parent to look for the next one. 6135 * 6136 * @hide 6137 */ 6138 public void clearAccessibilityFocus() { 6139 ViewRootImpl viewRootImpl = getViewRootImpl(); 6140 if (viewRootImpl != null) { 6141 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6142 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6143 viewRootImpl.setAccessibilityFocusedHost(null); 6144 } 6145 } 6146 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6147 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6148 invalidate(); 6149 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6150 notifyAccessibilityStateChanged(); 6151 6152 // Clear the text navigation state. 6153 setAccessibilityCursorPosition(-1); 6154 6155 // Try to move accessibility focus to the input focus. 6156 View rootView = getRootView(); 6157 if (rootView != null) { 6158 View inputFocus = rootView.findFocus(); 6159 if (inputFocus != null) { 6160 inputFocus.requestAccessibilityFocus(); 6161 } 6162 } 6163 } 6164 } 6165 6166 private void requestAccessibilityFocusFromHover() { 6167 if (includeForAccessibility() && isActionableForAccessibility()) { 6168 requestAccessibilityFocus(); 6169 } else { 6170 if (mParent != null) { 6171 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6172 if (nextFocus != null) { 6173 nextFocus.requestAccessibilityFocus(); 6174 } 6175 } 6176 } 6177 } 6178 6179 /** 6180 * @hide 6181 */ 6182 public boolean canTakeAccessibilityFocusFromHover() { 6183 if (includeForAccessibility() && isActionableForAccessibility()) { 6184 return true; 6185 } 6186 if (mParent != null) { 6187 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6188 } 6189 return false; 6190 } 6191 6192 /** 6193 * Clears accessibility focus without calling any callback methods 6194 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6195 * is used for clearing accessibility focus when giving this focus to 6196 * another view. 6197 */ 6198 void clearAccessibilityFocusNoCallbacks() { 6199 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6200 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6201 invalidate(); 6202 } 6203 } 6204 6205 /** 6206 * Call this to try to give focus to a specific view or to one of its 6207 * descendants. 6208 * 6209 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6210 * false), or if it is focusable and it is not focusable in touch mode 6211 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6212 * 6213 * See also {@link #focusSearch(int)}, which is what you call to say that you 6214 * have focus, and you want your parent to look for the next one. 6215 * 6216 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6217 * {@link #FOCUS_DOWN} and <code>null</code>. 6218 * 6219 * @return Whether this view or one of its descendants actually took focus. 6220 */ 6221 public final boolean requestFocus() { 6222 return requestFocus(View.FOCUS_DOWN); 6223 } 6224 6225 /** 6226 * Call this to try to give focus to a specific view or to one of its 6227 * descendants and give it a hint about what direction focus is heading. 6228 * 6229 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6230 * false), or if it is focusable and it is not focusable in touch mode 6231 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6232 * 6233 * See also {@link #focusSearch(int)}, which is what you call to say that you 6234 * have focus, and you want your parent to look for the next one. 6235 * 6236 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6237 * <code>null</code> set for the previously focused rectangle. 6238 * 6239 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6240 * @return Whether this view or one of its descendants actually took focus. 6241 */ 6242 public final boolean requestFocus(int direction) { 6243 return requestFocus(direction, null); 6244 } 6245 6246 /** 6247 * Call this to try to give focus to a specific view or to one of its descendants 6248 * and give it hints about the direction and a specific rectangle that the focus 6249 * is coming from. The rectangle can help give larger views a finer grained hint 6250 * about where focus is coming from, and therefore, where to show selection, or 6251 * forward focus change internally. 6252 * 6253 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6254 * false), or if it is focusable and it is not focusable in touch mode 6255 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6256 * 6257 * A View will not take focus if it is not visible. 6258 * 6259 * A View will not take focus if one of its parents has 6260 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6261 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6262 * 6263 * See also {@link #focusSearch(int)}, which is what you call to say that you 6264 * have focus, and you want your parent to look for the next one. 6265 * 6266 * You may wish to override this method if your custom {@link View} has an internal 6267 * {@link View} that it wishes to forward the request to. 6268 * 6269 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6270 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6271 * to give a finer grained hint about where focus is coming from. May be null 6272 * if there is no hint. 6273 * @return Whether this view or one of its descendants actually took focus. 6274 */ 6275 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6276 return requestFocusNoSearch(direction, previouslyFocusedRect); 6277 } 6278 6279 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6280 // need to be focusable 6281 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6282 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6283 return false; 6284 } 6285 6286 // need to be focusable in touch mode if in touch mode 6287 if (isInTouchMode() && 6288 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6289 return false; 6290 } 6291 6292 // need to not have any parents blocking us 6293 if (hasAncestorThatBlocksDescendantFocus()) { 6294 return false; 6295 } 6296 6297 handleFocusGainInternal(direction, previouslyFocusedRect); 6298 return true; 6299 } 6300 6301 /** 6302 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6303 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6304 * touch mode to request focus when they are touched. 6305 * 6306 * @return Whether this view or one of its descendants actually took focus. 6307 * 6308 * @see #isInTouchMode() 6309 * 6310 */ 6311 public final boolean requestFocusFromTouch() { 6312 // Leave touch mode if we need to 6313 if (isInTouchMode()) { 6314 ViewRootImpl viewRoot = getViewRootImpl(); 6315 if (viewRoot != null) { 6316 viewRoot.ensureTouchMode(false); 6317 } 6318 } 6319 return requestFocus(View.FOCUS_DOWN); 6320 } 6321 6322 /** 6323 * @return Whether any ancestor of this view blocks descendant focus. 6324 */ 6325 private boolean hasAncestorThatBlocksDescendantFocus() { 6326 ViewParent ancestor = mParent; 6327 while (ancestor instanceof ViewGroup) { 6328 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6329 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6330 return true; 6331 } else { 6332 ancestor = vgAncestor.getParent(); 6333 } 6334 } 6335 return false; 6336 } 6337 6338 /** 6339 * Gets the mode for determining whether this View is important for accessibility 6340 * which is if it fires accessibility events and if it is reported to 6341 * accessibility services that query the screen. 6342 * 6343 * @return The mode for determining whether a View is important for accessibility. 6344 * 6345 * @attr ref android.R.styleable#View_importantForAccessibility 6346 * 6347 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6348 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6349 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6350 */ 6351 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6352 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6353 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6354 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6355 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6356 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6357 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6358 }) 6359 public int getImportantForAccessibility() { 6360 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6361 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6362 } 6363 6364 /** 6365 * Sets how to determine whether this view is important for accessibility 6366 * which is if it fires accessibility events and if it is reported to 6367 * accessibility services that query the screen. 6368 * 6369 * @param mode How to determine whether this view is important for accessibility. 6370 * 6371 * @attr ref android.R.styleable#View_importantForAccessibility 6372 * 6373 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6374 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6375 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6376 */ 6377 public void setImportantForAccessibility(int mode) { 6378 if (mode != getImportantForAccessibility()) { 6379 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6380 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6381 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6382 notifyAccessibilityStateChanged(); 6383 } 6384 } 6385 6386 /** 6387 * Gets whether this view should be exposed for accessibility. 6388 * 6389 * @return Whether the view is exposed for accessibility. 6390 * 6391 * @hide 6392 */ 6393 public boolean isImportantForAccessibility() { 6394 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6395 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6396 switch (mode) { 6397 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6398 return true; 6399 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6400 return false; 6401 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6402 return isActionableForAccessibility() || hasListenersForAccessibility(); 6403 default: 6404 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6405 + mode); 6406 } 6407 } 6408 6409 /** 6410 * Gets the parent for accessibility purposes. Note that the parent for 6411 * accessibility is not necessary the immediate parent. It is the first 6412 * predecessor that is important for accessibility. 6413 * 6414 * @return The parent for accessibility purposes. 6415 */ 6416 public ViewParent getParentForAccessibility() { 6417 if (mParent instanceof View) { 6418 View parentView = (View) mParent; 6419 if (parentView.includeForAccessibility()) { 6420 return mParent; 6421 } else { 6422 return mParent.getParentForAccessibility(); 6423 } 6424 } 6425 return null; 6426 } 6427 6428 /** 6429 * Adds the children of a given View for accessibility. Since some Views are 6430 * not important for accessibility the children for accessibility are not 6431 * necessarily direct children of the riew, rather they are the first level of 6432 * descendants important for accessibility. 6433 * 6434 * @param children The list of children for accessibility. 6435 */ 6436 public void addChildrenForAccessibility(ArrayList<View> children) { 6437 if (includeForAccessibility()) { 6438 children.add(this); 6439 } 6440 } 6441 6442 /** 6443 * Whether to regard this view for accessibility. A view is regarded for 6444 * accessibility if it is important for accessibility or the querying 6445 * accessibility service has explicitly requested that view not 6446 * important for accessibility are regarded. 6447 * 6448 * @return Whether to regard the view for accessibility. 6449 * 6450 * @hide 6451 */ 6452 public boolean includeForAccessibility() { 6453 if (mAttachInfo != null) { 6454 if (!mAttachInfo.mIncludeNotImportantViews) { 6455 return isImportantForAccessibility(); 6456 } 6457 return true; 6458 } 6459 return false; 6460 } 6461 6462 /** 6463 * Returns whether the View is considered actionable from 6464 * accessibility perspective. Such view are important for 6465 * accessiiblity. 6466 * 6467 * @return True if the view is actionable for accessibility. 6468 * 6469 * @hide 6470 */ 6471 public boolean isActionableForAccessibility() { 6472 return (isClickable() || isLongClickable() || isFocusable()); 6473 } 6474 6475 /** 6476 * Returns whether the View has registered callbacks wich makes it 6477 * important for accessiiblity. 6478 * 6479 * @return True if the view is actionable for accessibility. 6480 */ 6481 private boolean hasListenersForAccessibility() { 6482 ListenerInfo info = getListenerInfo(); 6483 return mTouchDelegate != null || info.mOnKeyListener != null 6484 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6485 || info.mOnHoverListener != null || info.mOnDragListener != null; 6486 } 6487 6488 /** 6489 * Notifies accessibility services that some view's important for 6490 * accessibility state has changed. Note that such notifications 6491 * are made at most once every 6492 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6493 * to avoid unnecessary load to the system. Also once a view has 6494 * made a notifucation this method is a NOP until the notification has 6495 * been sent to clients. 6496 * 6497 * @hide 6498 * 6499 * TODO: Makse sure this method is called for any view state change 6500 * that is interesting for accessilility purposes. 6501 */ 6502 public void notifyAccessibilityStateChanged() { 6503 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6504 return; 6505 } 6506 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6507 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6508 if (mParent != null) { 6509 mParent.childAccessibilityStateChanged(this); 6510 } 6511 } 6512 } 6513 6514 /** 6515 * Reset the state indicating the this view has requested clients 6516 * interested in its accessiblity state to be notified. 6517 * 6518 * @hide 6519 */ 6520 public void resetAccessibilityStateChanged() { 6521 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6522 } 6523 6524 /** 6525 * Performs the specified accessibility action on the view. For 6526 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6527 * <p> 6528 * If an {@link AccessibilityDelegate} has been specified via calling 6529 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6530 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6531 * is responsible for handling this call. 6532 * </p> 6533 * 6534 * @param action The action to perform. 6535 * @param arguments Optional action arguments. 6536 * @return Whether the action was performed. 6537 */ 6538 public boolean performAccessibilityAction(int action, Bundle arguments) { 6539 if (mAccessibilityDelegate != null) { 6540 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6541 } else { 6542 return performAccessibilityActionInternal(action, arguments); 6543 } 6544 } 6545 6546 /** 6547 * @see #performAccessibilityAction(int, Bundle) 6548 * 6549 * Note: Called from the default {@link AccessibilityDelegate}. 6550 */ 6551 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6552 switch (action) { 6553 case AccessibilityNodeInfo.ACTION_CLICK: { 6554 if (isClickable()) { 6555 return performClick(); 6556 } 6557 } break; 6558 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6559 if (isLongClickable()) { 6560 return performLongClick(); 6561 } 6562 } break; 6563 case AccessibilityNodeInfo.ACTION_FOCUS: { 6564 if (!hasFocus()) { 6565 // Get out of touch mode since accessibility 6566 // wants to move focus around. 6567 getViewRootImpl().ensureTouchMode(false); 6568 return requestFocus(); 6569 } 6570 } break; 6571 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6572 if (hasFocus()) { 6573 clearFocus(); 6574 return !isFocused(); 6575 } 6576 } break; 6577 case AccessibilityNodeInfo.ACTION_SELECT: { 6578 if (!isSelected()) { 6579 setSelected(true); 6580 return isSelected(); 6581 } 6582 } break; 6583 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6584 if (isSelected()) { 6585 setSelected(false); 6586 return !isSelected(); 6587 } 6588 } break; 6589 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6590 if (!isAccessibilityFocused()) { 6591 return requestAccessibilityFocus(); 6592 } 6593 } break; 6594 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6595 if (isAccessibilityFocused()) { 6596 clearAccessibilityFocus(); 6597 return true; 6598 } 6599 } break; 6600 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6601 if (arguments != null) { 6602 final int granularity = arguments.getInt( 6603 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6604 return nextAtGranularity(granularity); 6605 } 6606 } break; 6607 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6608 if (arguments != null) { 6609 final int granularity = arguments.getInt( 6610 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6611 return previousAtGranularity(granularity); 6612 } 6613 } break; 6614 } 6615 return false; 6616 } 6617 6618 private boolean nextAtGranularity(int granularity) { 6619 CharSequence text = getIterableTextForAccessibility(); 6620 if (text != null && text.length() > 0) { 6621 return false; 6622 } 6623 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6624 if (iterator == null) { 6625 return false; 6626 } 6627 final int current = getAccessibilityCursorPosition(); 6628 final int[] range = iterator.following(current); 6629 if (range == null) { 6630 setAccessibilityCursorPosition(-1); 6631 return false; 6632 } 6633 final int start = range[0]; 6634 final int end = range[1]; 6635 setAccessibilityCursorPosition(start); 6636 sendViewTextTraversedAtGranularityEvent( 6637 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6638 granularity, start, end); 6639 return true; 6640 } 6641 6642 private boolean previousAtGranularity(int granularity) { 6643 CharSequence text = getIterableTextForAccessibility(); 6644 if (text != null && text.length() > 0) { 6645 return false; 6646 } 6647 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6648 if (iterator == null) { 6649 return false; 6650 } 6651 final int selectionStart = getAccessibilityCursorPosition(); 6652 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6653 final int[] range = iterator.preceding(current); 6654 if (range == null) { 6655 setAccessibilityCursorPosition(-1); 6656 return false; 6657 } 6658 final int start = range[0]; 6659 final int end = range[1]; 6660 setAccessibilityCursorPosition(end); 6661 sendViewTextTraversedAtGranularityEvent( 6662 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6663 granularity, start, end); 6664 return true; 6665 } 6666 6667 /** 6668 * Gets the text reported for accessibility purposes. 6669 * 6670 * @return The accessibility text. 6671 * 6672 * @hide 6673 */ 6674 public CharSequence getIterableTextForAccessibility() { 6675 return mContentDescription; 6676 } 6677 6678 /** 6679 * @hide 6680 */ 6681 public int getAccessibilityCursorPosition() { 6682 return mAccessibilityCursorPosition; 6683 } 6684 6685 /** 6686 * @hide 6687 */ 6688 public void setAccessibilityCursorPosition(int position) { 6689 mAccessibilityCursorPosition = position; 6690 } 6691 6692 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6693 int fromIndex, int toIndex) { 6694 if (mParent == null) { 6695 return; 6696 } 6697 AccessibilityEvent event = AccessibilityEvent.obtain( 6698 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6699 onInitializeAccessibilityEvent(event); 6700 onPopulateAccessibilityEvent(event); 6701 event.setFromIndex(fromIndex); 6702 event.setToIndex(toIndex); 6703 event.setAction(action); 6704 event.setMovementGranularity(granularity); 6705 mParent.requestSendAccessibilityEvent(this, event); 6706 } 6707 6708 /** 6709 * @hide 6710 */ 6711 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6712 switch (granularity) { 6713 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6714 CharSequence text = getIterableTextForAccessibility(); 6715 if (text != null && text.length() > 0) { 6716 CharacterTextSegmentIterator iterator = 6717 CharacterTextSegmentIterator.getInstance(mContext); 6718 iterator.initialize(text.toString()); 6719 return iterator; 6720 } 6721 } break; 6722 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6723 CharSequence text = getIterableTextForAccessibility(); 6724 if (text != null && text.length() > 0) { 6725 WordTextSegmentIterator iterator = 6726 WordTextSegmentIterator.getInstance(mContext); 6727 iterator.initialize(text.toString()); 6728 return iterator; 6729 } 6730 } break; 6731 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6732 CharSequence text = getIterableTextForAccessibility(); 6733 if (text != null && text.length() > 0) { 6734 ParagraphTextSegmentIterator iterator = 6735 ParagraphTextSegmentIterator.getInstance(); 6736 iterator.initialize(text.toString()); 6737 return iterator; 6738 } 6739 } break; 6740 } 6741 return null; 6742 } 6743 6744 /** 6745 * @hide 6746 */ 6747 public void dispatchStartTemporaryDetach() { 6748 clearAccessibilityFocus(); 6749 onStartTemporaryDetach(); 6750 } 6751 6752 /** 6753 * This is called when a container is going to temporarily detach a child, with 6754 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6755 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6756 * {@link #onDetachedFromWindow()} when the container is done. 6757 */ 6758 public void onStartTemporaryDetach() { 6759 removeUnsetPressCallback(); 6760 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6761 } 6762 6763 /** 6764 * @hide 6765 */ 6766 public void dispatchFinishTemporaryDetach() { 6767 onFinishTemporaryDetach(); 6768 } 6769 6770 /** 6771 * Called after {@link #onStartTemporaryDetach} when the container is done 6772 * changing the view. 6773 */ 6774 public void onFinishTemporaryDetach() { 6775 } 6776 6777 /** 6778 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6779 * for this view's window. Returns null if the view is not currently attached 6780 * to the window. Normally you will not need to use this directly, but 6781 * just use the standard high-level event callbacks like 6782 * {@link #onKeyDown(int, KeyEvent)}. 6783 */ 6784 public KeyEvent.DispatcherState getKeyDispatcherState() { 6785 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6786 } 6787 6788 /** 6789 * Dispatch a key event before it is processed by any input method 6790 * associated with the view hierarchy. This can be used to intercept 6791 * key events in special situations before the IME consumes them; a 6792 * typical example would be handling the BACK key to update the application's 6793 * UI instead of allowing the IME to see it and close itself. 6794 * 6795 * @param event The key event to be dispatched. 6796 * @return True if the event was handled, false otherwise. 6797 */ 6798 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6799 return onKeyPreIme(event.getKeyCode(), event); 6800 } 6801 6802 /** 6803 * Dispatch a key event to the next view on the focus path. This path runs 6804 * from the top of the view tree down to the currently focused view. If this 6805 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6806 * the next node down the focus path. This method also fires any key 6807 * listeners. 6808 * 6809 * @param event The key event to be dispatched. 6810 * @return True if the event was handled, false otherwise. 6811 */ 6812 public boolean dispatchKeyEvent(KeyEvent event) { 6813 if (mInputEventConsistencyVerifier != null) { 6814 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6815 } 6816 6817 // Give any attached key listener a first crack at the event. 6818 //noinspection SimplifiableIfStatement 6819 ListenerInfo li = mListenerInfo; 6820 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6821 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6822 return true; 6823 } 6824 6825 if (event.dispatch(this, mAttachInfo != null 6826 ? mAttachInfo.mKeyDispatchState : null, this)) { 6827 return true; 6828 } 6829 6830 if (mInputEventConsistencyVerifier != null) { 6831 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6832 } 6833 return false; 6834 } 6835 6836 /** 6837 * Dispatches a key shortcut event. 6838 * 6839 * @param event The key event to be dispatched. 6840 * @return True if the event was handled by the view, false otherwise. 6841 */ 6842 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6843 return onKeyShortcut(event.getKeyCode(), event); 6844 } 6845 6846 /** 6847 * Pass the touch screen motion event down to the target view, or this 6848 * view if it is the target. 6849 * 6850 * @param event The motion event to be dispatched. 6851 * @return True if the event was handled by the view, false otherwise. 6852 */ 6853 public boolean dispatchTouchEvent(MotionEvent event) { 6854 if (mInputEventConsistencyVerifier != null) { 6855 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6856 } 6857 6858 if (onFilterTouchEventForSecurity(event)) { 6859 //noinspection SimplifiableIfStatement 6860 ListenerInfo li = mListenerInfo; 6861 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6862 && li.mOnTouchListener.onTouch(this, event)) { 6863 return true; 6864 } 6865 6866 if (onTouchEvent(event)) { 6867 return true; 6868 } 6869 } 6870 6871 if (mInputEventConsistencyVerifier != null) { 6872 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6873 } 6874 return false; 6875 } 6876 6877 /** 6878 * Filter the touch event to apply security policies. 6879 * 6880 * @param event The motion event to be filtered. 6881 * @return True if the event should be dispatched, false if the event should be dropped. 6882 * 6883 * @see #getFilterTouchesWhenObscured 6884 */ 6885 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6886 //noinspection RedundantIfStatement 6887 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6888 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6889 // Window is obscured, drop this touch. 6890 return false; 6891 } 6892 return true; 6893 } 6894 6895 /** 6896 * Pass a trackball motion event down to the focused view. 6897 * 6898 * @param event The motion event to be dispatched. 6899 * @return True if the event was handled by the view, false otherwise. 6900 */ 6901 public boolean dispatchTrackballEvent(MotionEvent event) { 6902 if (mInputEventConsistencyVerifier != null) { 6903 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6904 } 6905 6906 return onTrackballEvent(event); 6907 } 6908 6909 /** 6910 * Dispatch a generic motion event. 6911 * <p> 6912 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6913 * are delivered to the view under the pointer. All other generic motion events are 6914 * delivered to the focused view. Hover events are handled specially and are delivered 6915 * to {@link #onHoverEvent(MotionEvent)}. 6916 * </p> 6917 * 6918 * @param event The motion event to be dispatched. 6919 * @return True if the event was handled by the view, false otherwise. 6920 */ 6921 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6922 if (mInputEventConsistencyVerifier != null) { 6923 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6924 } 6925 6926 final int source = event.getSource(); 6927 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6928 final int action = event.getAction(); 6929 if (action == MotionEvent.ACTION_HOVER_ENTER 6930 || action == MotionEvent.ACTION_HOVER_MOVE 6931 || action == MotionEvent.ACTION_HOVER_EXIT) { 6932 if (dispatchHoverEvent(event)) { 6933 return true; 6934 } 6935 } else if (dispatchGenericPointerEvent(event)) { 6936 return true; 6937 } 6938 } else if (dispatchGenericFocusedEvent(event)) { 6939 return true; 6940 } 6941 6942 if (dispatchGenericMotionEventInternal(event)) { 6943 return true; 6944 } 6945 6946 if (mInputEventConsistencyVerifier != null) { 6947 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6948 } 6949 return false; 6950 } 6951 6952 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6953 //noinspection SimplifiableIfStatement 6954 ListenerInfo li = mListenerInfo; 6955 if (li != null && li.mOnGenericMotionListener != null 6956 && (mViewFlags & ENABLED_MASK) == ENABLED 6957 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6958 return true; 6959 } 6960 6961 if (onGenericMotionEvent(event)) { 6962 return true; 6963 } 6964 6965 if (mInputEventConsistencyVerifier != null) { 6966 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6967 } 6968 return false; 6969 } 6970 6971 /** 6972 * Dispatch a hover event. 6973 * <p> 6974 * Do not call this method directly. 6975 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6976 * </p> 6977 * 6978 * @param event The motion event to be dispatched. 6979 * @return True if the event was handled by the view, false otherwise. 6980 */ 6981 protected boolean dispatchHoverEvent(MotionEvent event) { 6982 //noinspection SimplifiableIfStatement 6983 ListenerInfo li = mListenerInfo; 6984 if (li != null && li.mOnHoverListener != null 6985 && (mViewFlags & ENABLED_MASK) == ENABLED 6986 && li.mOnHoverListener.onHover(this, event)) { 6987 return true; 6988 } 6989 6990 return onHoverEvent(event); 6991 } 6992 6993 /** 6994 * Returns true if the view has a child to which it has recently sent 6995 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6996 * it does not have a hovered child, then it must be the innermost hovered view. 6997 * @hide 6998 */ 6999 protected boolean hasHoveredChild() { 7000 return false; 7001 } 7002 7003 /** 7004 * Dispatch a generic motion event to the view under the first pointer. 7005 * <p> 7006 * Do not call this method directly. 7007 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7008 * </p> 7009 * 7010 * @param event The motion event to be dispatched. 7011 * @return True if the event was handled by the view, false otherwise. 7012 */ 7013 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7014 return false; 7015 } 7016 7017 /** 7018 * Dispatch a generic motion event to the currently focused view. 7019 * <p> 7020 * Do not call this method directly. 7021 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7022 * </p> 7023 * 7024 * @param event The motion event to be dispatched. 7025 * @return True if the event was handled by the view, false otherwise. 7026 */ 7027 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7028 return false; 7029 } 7030 7031 /** 7032 * Dispatch a pointer event. 7033 * <p> 7034 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7035 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7036 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7037 * and should not be expected to handle other pointing device features. 7038 * </p> 7039 * 7040 * @param event The motion event to be dispatched. 7041 * @return True if the event was handled by the view, false otherwise. 7042 * @hide 7043 */ 7044 public final boolean dispatchPointerEvent(MotionEvent event) { 7045 if (event.isTouchEvent()) { 7046 return dispatchTouchEvent(event); 7047 } else { 7048 return dispatchGenericMotionEvent(event); 7049 } 7050 } 7051 7052 /** 7053 * Called when the window containing this view gains or loses window focus. 7054 * ViewGroups should override to route to their children. 7055 * 7056 * @param hasFocus True if the window containing this view now has focus, 7057 * false otherwise. 7058 */ 7059 public void dispatchWindowFocusChanged(boolean hasFocus) { 7060 onWindowFocusChanged(hasFocus); 7061 } 7062 7063 /** 7064 * Called when the window containing this view gains or loses focus. Note 7065 * that this is separate from view focus: to receive key events, both 7066 * your view and its window must have focus. If a window is displayed 7067 * on top of yours that takes input focus, then your own window will lose 7068 * focus but the view focus will remain unchanged. 7069 * 7070 * @param hasWindowFocus True if the window containing this view now has 7071 * focus, false otherwise. 7072 */ 7073 public void onWindowFocusChanged(boolean hasWindowFocus) { 7074 InputMethodManager imm = InputMethodManager.peekInstance(); 7075 if (!hasWindowFocus) { 7076 if (isPressed()) { 7077 setPressed(false); 7078 } 7079 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7080 imm.focusOut(this); 7081 } 7082 removeLongPressCallback(); 7083 removeTapCallback(); 7084 onFocusLost(); 7085 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7086 imm.focusIn(this); 7087 } 7088 refreshDrawableState(); 7089 } 7090 7091 /** 7092 * Returns true if this view is in a window that currently has window focus. 7093 * Note that this is not the same as the view itself having focus. 7094 * 7095 * @return True if this view is in a window that currently has window focus. 7096 */ 7097 public boolean hasWindowFocus() { 7098 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7099 } 7100 7101 /** 7102 * Dispatch a view visibility change down the view hierarchy. 7103 * ViewGroups should override to route to their children. 7104 * @param changedView The view whose visibility changed. Could be 'this' or 7105 * an ancestor view. 7106 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7107 * {@link #INVISIBLE} or {@link #GONE}. 7108 */ 7109 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7110 onVisibilityChanged(changedView, visibility); 7111 } 7112 7113 /** 7114 * Called when the visibility of the view or an ancestor of the view is changed. 7115 * @param changedView The view whose visibility changed. Could be 'this' or 7116 * an ancestor view. 7117 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7118 * {@link #INVISIBLE} or {@link #GONE}. 7119 */ 7120 protected void onVisibilityChanged(View changedView, int visibility) { 7121 if (visibility == VISIBLE) { 7122 if (mAttachInfo != null) { 7123 initialAwakenScrollBars(); 7124 } else { 7125 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7126 } 7127 } 7128 } 7129 7130 /** 7131 * Dispatch a hint about whether this view is displayed. For instance, when 7132 * a View moves out of the screen, it might receives a display hint indicating 7133 * the view is not displayed. Applications should not <em>rely</em> on this hint 7134 * as there is no guarantee that they will receive one. 7135 * 7136 * @param hint A hint about whether or not this view is displayed: 7137 * {@link #VISIBLE} or {@link #INVISIBLE}. 7138 */ 7139 public void dispatchDisplayHint(int hint) { 7140 onDisplayHint(hint); 7141 } 7142 7143 /** 7144 * Gives this view a hint about whether is displayed or not. For instance, when 7145 * a View moves out of the screen, it might receives a display hint indicating 7146 * the view is not displayed. Applications should not <em>rely</em> on this hint 7147 * as there is no guarantee that they will receive one. 7148 * 7149 * @param hint A hint about whether or not this view is displayed: 7150 * {@link #VISIBLE} or {@link #INVISIBLE}. 7151 */ 7152 protected void onDisplayHint(int hint) { 7153 } 7154 7155 /** 7156 * Dispatch a window visibility change down the view hierarchy. 7157 * ViewGroups should override to route to their children. 7158 * 7159 * @param visibility The new visibility of the window. 7160 * 7161 * @see #onWindowVisibilityChanged(int) 7162 */ 7163 public void dispatchWindowVisibilityChanged(int visibility) { 7164 onWindowVisibilityChanged(visibility); 7165 } 7166 7167 /** 7168 * Called when the window containing has change its visibility 7169 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7170 * that this tells you whether or not your window is being made visible 7171 * to the window manager; this does <em>not</em> tell you whether or not 7172 * your window is obscured by other windows on the screen, even if it 7173 * is itself visible. 7174 * 7175 * @param visibility The new visibility of the window. 7176 */ 7177 protected void onWindowVisibilityChanged(int visibility) { 7178 if (visibility == VISIBLE) { 7179 initialAwakenScrollBars(); 7180 } 7181 } 7182 7183 /** 7184 * Returns the current visibility of the window this view is attached to 7185 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7186 * 7187 * @return Returns the current visibility of the view's window. 7188 */ 7189 public int getWindowVisibility() { 7190 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7191 } 7192 7193 /** 7194 * Retrieve the overall visible display size in which the window this view is 7195 * attached to has been positioned in. This takes into account screen 7196 * decorations above the window, for both cases where the window itself 7197 * is being position inside of them or the window is being placed under 7198 * then and covered insets are used for the window to position its content 7199 * inside. In effect, this tells you the available area where content can 7200 * be placed and remain visible to users. 7201 * 7202 * <p>This function requires an IPC back to the window manager to retrieve 7203 * the requested information, so should not be used in performance critical 7204 * code like drawing. 7205 * 7206 * @param outRect Filled in with the visible display frame. If the view 7207 * is not attached to a window, this is simply the raw display size. 7208 */ 7209 public void getWindowVisibleDisplayFrame(Rect outRect) { 7210 if (mAttachInfo != null) { 7211 try { 7212 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7213 } catch (RemoteException e) { 7214 return; 7215 } 7216 // XXX This is really broken, and probably all needs to be done 7217 // in the window manager, and we need to know more about whether 7218 // we want the area behind or in front of the IME. 7219 final Rect insets = mAttachInfo.mVisibleInsets; 7220 outRect.left += insets.left; 7221 outRect.top += insets.top; 7222 outRect.right -= insets.right; 7223 outRect.bottom -= insets.bottom; 7224 return; 7225 } 7226 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7227 d.getRectSize(outRect); 7228 } 7229 7230 /** 7231 * Dispatch a notification about a resource configuration change down 7232 * the view hierarchy. 7233 * ViewGroups should override to route to their children. 7234 * 7235 * @param newConfig The new resource configuration. 7236 * 7237 * @see #onConfigurationChanged(android.content.res.Configuration) 7238 */ 7239 public void dispatchConfigurationChanged(Configuration newConfig) { 7240 onConfigurationChanged(newConfig); 7241 } 7242 7243 /** 7244 * Called when the current configuration of the resources being used 7245 * by the application have changed. You can use this to decide when 7246 * to reload resources that can changed based on orientation and other 7247 * configuration characterstics. You only need to use this if you are 7248 * not relying on the normal {@link android.app.Activity} mechanism of 7249 * recreating the activity instance upon a configuration change. 7250 * 7251 * @param newConfig The new resource configuration. 7252 */ 7253 protected void onConfigurationChanged(Configuration newConfig) { 7254 } 7255 7256 /** 7257 * Private function to aggregate all per-view attributes in to the view 7258 * root. 7259 */ 7260 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7261 performCollectViewAttributes(attachInfo, visibility); 7262 } 7263 7264 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7265 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7266 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7267 attachInfo.mKeepScreenOn = true; 7268 } 7269 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7270 ListenerInfo li = mListenerInfo; 7271 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7272 attachInfo.mHasSystemUiListeners = true; 7273 } 7274 } 7275 } 7276 7277 void needGlobalAttributesUpdate(boolean force) { 7278 final AttachInfo ai = mAttachInfo; 7279 if (ai != null) { 7280 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7281 || ai.mHasSystemUiListeners) { 7282 ai.mRecomputeGlobalAttributes = true; 7283 } 7284 } 7285 } 7286 7287 /** 7288 * Returns whether the device is currently in touch mode. Touch mode is entered 7289 * once the user begins interacting with the device by touch, and affects various 7290 * things like whether focus is always visible to the user. 7291 * 7292 * @return Whether the device is in touch mode. 7293 */ 7294 @ViewDebug.ExportedProperty 7295 public boolean isInTouchMode() { 7296 if (mAttachInfo != null) { 7297 return mAttachInfo.mInTouchMode; 7298 } else { 7299 return ViewRootImpl.isInTouchMode(); 7300 } 7301 } 7302 7303 /** 7304 * Returns the context the view is running in, through which it can 7305 * access the current theme, resources, etc. 7306 * 7307 * @return The view's Context. 7308 */ 7309 @ViewDebug.CapturedViewProperty 7310 public final Context getContext() { 7311 return mContext; 7312 } 7313 7314 /** 7315 * Handle a key event before it is processed by any input method 7316 * associated with the view hierarchy. This can be used to intercept 7317 * key events in special situations before the IME consumes them; a 7318 * typical example would be handling the BACK key to update the application's 7319 * UI instead of allowing the IME to see it and close itself. 7320 * 7321 * @param keyCode The value in event.getKeyCode(). 7322 * @param event Description of the key event. 7323 * @return If you handled the event, return true. If you want to allow the 7324 * event to be handled by the next receiver, return false. 7325 */ 7326 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7327 return false; 7328 } 7329 7330 /** 7331 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7332 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7333 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7334 * is released, if the view is enabled and clickable. 7335 * 7336 * @param keyCode A key code that represents the button pressed, from 7337 * {@link android.view.KeyEvent}. 7338 * @param event The KeyEvent object that defines the button action. 7339 */ 7340 public boolean onKeyDown(int keyCode, KeyEvent event) { 7341 boolean result = false; 7342 7343 switch (keyCode) { 7344 case KeyEvent.KEYCODE_DPAD_CENTER: 7345 case KeyEvent.KEYCODE_ENTER: { 7346 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7347 return true; 7348 } 7349 // Long clickable items don't necessarily have to be clickable 7350 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7351 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7352 (event.getRepeatCount() == 0)) { 7353 setPressed(true); 7354 checkForLongClick(0); 7355 return true; 7356 } 7357 break; 7358 } 7359 } 7360 return result; 7361 } 7362 7363 /** 7364 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7365 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7366 * the event). 7367 */ 7368 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7369 return false; 7370 } 7371 7372 /** 7373 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7374 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7375 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7376 * {@link KeyEvent#KEYCODE_ENTER} is released. 7377 * 7378 * @param keyCode A key code that represents the button pressed, from 7379 * {@link android.view.KeyEvent}. 7380 * @param event The KeyEvent object that defines the button action. 7381 */ 7382 public boolean onKeyUp(int keyCode, KeyEvent event) { 7383 boolean result = false; 7384 7385 switch (keyCode) { 7386 case KeyEvent.KEYCODE_DPAD_CENTER: 7387 case KeyEvent.KEYCODE_ENTER: { 7388 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7389 return true; 7390 } 7391 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7392 setPressed(false); 7393 7394 if (!mHasPerformedLongPress) { 7395 // This is a tap, so remove the longpress check 7396 removeLongPressCallback(); 7397 7398 result = performClick(); 7399 } 7400 } 7401 break; 7402 } 7403 } 7404 return result; 7405 } 7406 7407 /** 7408 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7409 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7410 * the event). 7411 * 7412 * @param keyCode A key code that represents the button pressed, from 7413 * {@link android.view.KeyEvent}. 7414 * @param repeatCount The number of times the action was made. 7415 * @param event The KeyEvent object that defines the button action. 7416 */ 7417 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7418 return false; 7419 } 7420 7421 /** 7422 * Called on the focused view when a key shortcut event is not handled. 7423 * Override this method to implement local key shortcuts for the View. 7424 * Key shortcuts can also be implemented by setting the 7425 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7426 * 7427 * @param keyCode The value in event.getKeyCode(). 7428 * @param event Description of the key event. 7429 * @return If you handled the event, return true. If you want to allow the 7430 * event to be handled by the next receiver, return false. 7431 */ 7432 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7433 return false; 7434 } 7435 7436 /** 7437 * Check whether the called view is a text editor, in which case it 7438 * would make sense to automatically display a soft input window for 7439 * it. Subclasses should override this if they implement 7440 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7441 * a call on that method would return a non-null InputConnection, and 7442 * they are really a first-class editor that the user would normally 7443 * start typing on when the go into a window containing your view. 7444 * 7445 * <p>The default implementation always returns false. This does 7446 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7447 * will not be called or the user can not otherwise perform edits on your 7448 * view; it is just a hint to the system that this is not the primary 7449 * purpose of this view. 7450 * 7451 * @return Returns true if this view is a text editor, else false. 7452 */ 7453 public boolean onCheckIsTextEditor() { 7454 return false; 7455 } 7456 7457 /** 7458 * Create a new InputConnection for an InputMethod to interact 7459 * with the view. The default implementation returns null, since it doesn't 7460 * support input methods. You can override this to implement such support. 7461 * This is only needed for views that take focus and text input. 7462 * 7463 * <p>When implementing this, you probably also want to implement 7464 * {@link #onCheckIsTextEditor()} to indicate you will return a 7465 * non-null InputConnection. 7466 * 7467 * @param outAttrs Fill in with attribute information about the connection. 7468 */ 7469 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7470 return null; 7471 } 7472 7473 /** 7474 * Called by the {@link android.view.inputmethod.InputMethodManager} 7475 * when a view who is not the current 7476 * input connection target is trying to make a call on the manager. The 7477 * default implementation returns false; you can override this to return 7478 * true for certain views if you are performing InputConnection proxying 7479 * to them. 7480 * @param view The View that is making the InputMethodManager call. 7481 * @return Return true to allow the call, false to reject. 7482 */ 7483 public boolean checkInputConnectionProxy(View view) { 7484 return false; 7485 } 7486 7487 /** 7488 * Show the context menu for this view. It is not safe to hold on to the 7489 * menu after returning from this method. 7490 * 7491 * You should normally not overload this method. Overload 7492 * {@link #onCreateContextMenu(ContextMenu)} or define an 7493 * {@link OnCreateContextMenuListener} to add items to the context menu. 7494 * 7495 * @param menu The context menu to populate 7496 */ 7497 public void createContextMenu(ContextMenu menu) { 7498 ContextMenuInfo menuInfo = getContextMenuInfo(); 7499 7500 // Sets the current menu info so all items added to menu will have 7501 // my extra info set. 7502 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7503 7504 onCreateContextMenu(menu); 7505 ListenerInfo li = mListenerInfo; 7506 if (li != null && li.mOnCreateContextMenuListener != null) { 7507 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7508 } 7509 7510 // Clear the extra information so subsequent items that aren't mine don't 7511 // have my extra info. 7512 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7513 7514 if (mParent != null) { 7515 mParent.createContextMenu(menu); 7516 } 7517 } 7518 7519 /** 7520 * Views should implement this if they have extra information to associate 7521 * with the context menu. The return result is supplied as a parameter to 7522 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7523 * callback. 7524 * 7525 * @return Extra information about the item for which the context menu 7526 * should be shown. This information will vary across different 7527 * subclasses of View. 7528 */ 7529 protected ContextMenuInfo getContextMenuInfo() { 7530 return null; 7531 } 7532 7533 /** 7534 * Views should implement this if the view itself is going to add items to 7535 * the context menu. 7536 * 7537 * @param menu the context menu to populate 7538 */ 7539 protected void onCreateContextMenu(ContextMenu menu) { 7540 } 7541 7542 /** 7543 * Implement this method to handle trackball motion events. The 7544 * <em>relative</em> movement of the trackball since the last event 7545 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7546 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7547 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7548 * they will often be fractional values, representing the more fine-grained 7549 * movement information available from a trackball). 7550 * 7551 * @param event The motion event. 7552 * @return True if the event was handled, false otherwise. 7553 */ 7554 public boolean onTrackballEvent(MotionEvent event) { 7555 return false; 7556 } 7557 7558 /** 7559 * Implement this method to handle generic motion events. 7560 * <p> 7561 * Generic motion events describe joystick movements, mouse hovers, track pad 7562 * touches, scroll wheel movements and other input events. The 7563 * {@link MotionEvent#getSource() source} of the motion event specifies 7564 * the class of input that was received. Implementations of this method 7565 * must examine the bits in the source before processing the event. 7566 * The following code example shows how this is done. 7567 * </p><p> 7568 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7569 * are delivered to the view under the pointer. All other generic motion events are 7570 * delivered to the focused view. 7571 * </p> 7572 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7573 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7574 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7575 * // process the joystick movement... 7576 * return true; 7577 * } 7578 * } 7579 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7580 * switch (event.getAction()) { 7581 * case MotionEvent.ACTION_HOVER_MOVE: 7582 * // process the mouse hover movement... 7583 * return true; 7584 * case MotionEvent.ACTION_SCROLL: 7585 * // process the scroll wheel movement... 7586 * return true; 7587 * } 7588 * } 7589 * return super.onGenericMotionEvent(event); 7590 * }</pre> 7591 * 7592 * @param event The generic motion event being processed. 7593 * @return True if the event was handled, false otherwise. 7594 */ 7595 public boolean onGenericMotionEvent(MotionEvent event) { 7596 return false; 7597 } 7598 7599 /** 7600 * Implement this method to handle hover events. 7601 * <p> 7602 * This method is called whenever a pointer is hovering into, over, or out of the 7603 * bounds of a view and the view is not currently being touched. 7604 * Hover events are represented as pointer events with action 7605 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7606 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7607 * </p> 7608 * <ul> 7609 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7610 * when the pointer enters the bounds of the view.</li> 7611 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7612 * when the pointer has already entered the bounds of the view and has moved.</li> 7613 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7614 * when the pointer has exited the bounds of the view or when the pointer is 7615 * about to go down due to a button click, tap, or similar user action that 7616 * causes the view to be touched.</li> 7617 * </ul> 7618 * <p> 7619 * The view should implement this method to return true to indicate that it is 7620 * handling the hover event, such as by changing its drawable state. 7621 * </p><p> 7622 * The default implementation calls {@link #setHovered} to update the hovered state 7623 * of the view when a hover enter or hover exit event is received, if the view 7624 * is enabled and is clickable. The default implementation also sends hover 7625 * accessibility events. 7626 * </p> 7627 * 7628 * @param event The motion event that describes the hover. 7629 * @return True if the view handled the hover event. 7630 * 7631 * @see #isHovered 7632 * @see #setHovered 7633 * @see #onHoverChanged 7634 */ 7635 public boolean onHoverEvent(MotionEvent event) { 7636 // The root view may receive hover (or touch) events that are outside the bounds of 7637 // the window. This code ensures that we only send accessibility events for 7638 // hovers that are actually within the bounds of the root view. 7639 final int action = event.getActionMasked(); 7640 if (!mSendingHoverAccessibilityEvents) { 7641 if ((action == MotionEvent.ACTION_HOVER_ENTER 7642 || action == MotionEvent.ACTION_HOVER_MOVE) 7643 && !hasHoveredChild() 7644 && pointInView(event.getX(), event.getY())) { 7645 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7646 mSendingHoverAccessibilityEvents = true; 7647 requestAccessibilityFocusFromHover(); 7648 } 7649 } else { 7650 if (action == MotionEvent.ACTION_HOVER_EXIT 7651 || (action == MotionEvent.ACTION_MOVE 7652 && !pointInView(event.getX(), event.getY()))) { 7653 mSendingHoverAccessibilityEvents = false; 7654 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7655 // If the window does not have input focus we take away accessibility 7656 // focus as soon as the user stop hovering over the view. 7657 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7658 getViewRootImpl().setAccessibilityFocusedHost(null); 7659 } 7660 } 7661 } 7662 7663 if (isHoverable()) { 7664 switch (action) { 7665 case MotionEvent.ACTION_HOVER_ENTER: 7666 setHovered(true); 7667 break; 7668 case MotionEvent.ACTION_HOVER_EXIT: 7669 setHovered(false); 7670 break; 7671 } 7672 7673 // Dispatch the event to onGenericMotionEvent before returning true. 7674 // This is to provide compatibility with existing applications that 7675 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7676 // break because of the new default handling for hoverable views 7677 // in onHoverEvent. 7678 // Note that onGenericMotionEvent will be called by default when 7679 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7680 dispatchGenericMotionEventInternal(event); 7681 return true; 7682 } 7683 7684 return false; 7685 } 7686 7687 /** 7688 * Returns true if the view should handle {@link #onHoverEvent} 7689 * by calling {@link #setHovered} to change its hovered state. 7690 * 7691 * @return True if the view is hoverable. 7692 */ 7693 private boolean isHoverable() { 7694 final int viewFlags = mViewFlags; 7695 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7696 return false; 7697 } 7698 7699 return (viewFlags & CLICKABLE) == CLICKABLE 7700 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7701 } 7702 7703 /** 7704 * Returns true if the view is currently hovered. 7705 * 7706 * @return True if the view is currently hovered. 7707 * 7708 * @see #setHovered 7709 * @see #onHoverChanged 7710 */ 7711 @ViewDebug.ExportedProperty 7712 public boolean isHovered() { 7713 return (mPrivateFlags & HOVERED) != 0; 7714 } 7715 7716 /** 7717 * Sets whether the view is currently hovered. 7718 * <p> 7719 * Calling this method also changes the drawable state of the view. This 7720 * enables the view to react to hover by using different drawable resources 7721 * to change its appearance. 7722 * </p><p> 7723 * The {@link #onHoverChanged} method is called when the hovered state changes. 7724 * </p> 7725 * 7726 * @param hovered True if the view is hovered. 7727 * 7728 * @see #isHovered 7729 * @see #onHoverChanged 7730 */ 7731 public void setHovered(boolean hovered) { 7732 if (hovered) { 7733 if ((mPrivateFlags & HOVERED) == 0) { 7734 mPrivateFlags |= HOVERED; 7735 refreshDrawableState(); 7736 onHoverChanged(true); 7737 } 7738 } else { 7739 if ((mPrivateFlags & HOVERED) != 0) { 7740 mPrivateFlags &= ~HOVERED; 7741 refreshDrawableState(); 7742 onHoverChanged(false); 7743 } 7744 } 7745 } 7746 7747 /** 7748 * Implement this method to handle hover state changes. 7749 * <p> 7750 * This method is called whenever the hover state changes as a result of a 7751 * call to {@link #setHovered}. 7752 * </p> 7753 * 7754 * @param hovered The current hover state, as returned by {@link #isHovered}. 7755 * 7756 * @see #isHovered 7757 * @see #setHovered 7758 */ 7759 public void onHoverChanged(boolean hovered) { 7760 } 7761 7762 /** 7763 * Implement this method to handle touch screen motion events. 7764 * 7765 * @param event The motion event. 7766 * @return True if the event was handled, false otherwise. 7767 */ 7768 public boolean onTouchEvent(MotionEvent event) { 7769 final int viewFlags = mViewFlags; 7770 7771 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7772 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7773 setPressed(false); 7774 } 7775 // A disabled view that is clickable still consumes the touch 7776 // events, it just doesn't respond to them. 7777 return (((viewFlags & CLICKABLE) == CLICKABLE || 7778 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7779 } 7780 7781 if (mTouchDelegate != null) { 7782 if (mTouchDelegate.onTouchEvent(event)) { 7783 return true; 7784 } 7785 } 7786 7787 if (((viewFlags & CLICKABLE) == CLICKABLE || 7788 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7789 switch (event.getAction()) { 7790 case MotionEvent.ACTION_UP: 7791 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7792 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7793 // take focus if we don't have it already and we should in 7794 // touch mode. 7795 boolean focusTaken = false; 7796 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7797 focusTaken = requestFocus(); 7798 } 7799 7800 if (prepressed) { 7801 // The button is being released before we actually 7802 // showed it as pressed. Make it show the pressed 7803 // state now (before scheduling the click) to ensure 7804 // the user sees it. 7805 setPressed(true); 7806 } 7807 7808 if (!mHasPerformedLongPress) { 7809 // This is a tap, so remove the longpress check 7810 removeLongPressCallback(); 7811 7812 // Only perform take click actions if we were in the pressed state 7813 if (!focusTaken) { 7814 // Use a Runnable and post this rather than calling 7815 // performClick directly. This lets other visual state 7816 // of the view update before click actions start. 7817 if (mPerformClick == null) { 7818 mPerformClick = new PerformClick(); 7819 } 7820 if (!post(mPerformClick)) { 7821 performClick(); 7822 } 7823 } 7824 } 7825 7826 if (mUnsetPressedState == null) { 7827 mUnsetPressedState = new UnsetPressedState(); 7828 } 7829 7830 if (prepressed) { 7831 postDelayed(mUnsetPressedState, 7832 ViewConfiguration.getPressedStateDuration()); 7833 } else if (!post(mUnsetPressedState)) { 7834 // If the post failed, unpress right now 7835 mUnsetPressedState.run(); 7836 } 7837 removeTapCallback(); 7838 } 7839 break; 7840 7841 case MotionEvent.ACTION_DOWN: 7842 mHasPerformedLongPress = false; 7843 7844 if (performButtonActionOnTouchDown(event)) { 7845 break; 7846 } 7847 7848 // Walk up the hierarchy to determine if we're inside a scrolling container. 7849 boolean isInScrollingContainer = isInScrollingContainer(); 7850 7851 // For views inside a scrolling container, delay the pressed feedback for 7852 // a short period in case this is a scroll. 7853 if (isInScrollingContainer) { 7854 mPrivateFlags |= PREPRESSED; 7855 if (mPendingCheckForTap == null) { 7856 mPendingCheckForTap = new CheckForTap(); 7857 } 7858 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7859 } else { 7860 // Not inside a scrolling container, so show the feedback right away 7861 setPressed(true); 7862 checkForLongClick(0); 7863 } 7864 break; 7865 7866 case MotionEvent.ACTION_CANCEL: 7867 setPressed(false); 7868 removeTapCallback(); 7869 break; 7870 7871 case MotionEvent.ACTION_MOVE: 7872 final int x = (int) event.getX(); 7873 final int y = (int) event.getY(); 7874 7875 // Be lenient about moving outside of buttons 7876 if (!pointInView(x, y, mTouchSlop)) { 7877 // Outside button 7878 removeTapCallback(); 7879 if ((mPrivateFlags & PRESSED) != 0) { 7880 // Remove any future long press/tap checks 7881 removeLongPressCallback(); 7882 7883 setPressed(false); 7884 } 7885 } 7886 break; 7887 } 7888 return true; 7889 } 7890 7891 return false; 7892 } 7893 7894 /** 7895 * @hide 7896 */ 7897 public boolean isInScrollingContainer() { 7898 ViewParent p = getParent(); 7899 while (p != null && p instanceof ViewGroup) { 7900 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7901 return true; 7902 } 7903 p = p.getParent(); 7904 } 7905 return false; 7906 } 7907 7908 /** 7909 * Remove the longpress detection timer. 7910 */ 7911 private void removeLongPressCallback() { 7912 if (mPendingCheckForLongPress != null) { 7913 removeCallbacks(mPendingCheckForLongPress); 7914 } 7915 } 7916 7917 /** 7918 * Remove the pending click action 7919 */ 7920 private void removePerformClickCallback() { 7921 if (mPerformClick != null) { 7922 removeCallbacks(mPerformClick); 7923 } 7924 } 7925 7926 /** 7927 * Remove the prepress detection timer. 7928 */ 7929 private void removeUnsetPressCallback() { 7930 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7931 setPressed(false); 7932 removeCallbacks(mUnsetPressedState); 7933 } 7934 } 7935 7936 /** 7937 * Remove the tap detection timer. 7938 */ 7939 private void removeTapCallback() { 7940 if (mPendingCheckForTap != null) { 7941 mPrivateFlags &= ~PREPRESSED; 7942 removeCallbacks(mPendingCheckForTap); 7943 } 7944 } 7945 7946 /** 7947 * Cancels a pending long press. Your subclass can use this if you 7948 * want the context menu to come up if the user presses and holds 7949 * at the same place, but you don't want it to come up if they press 7950 * and then move around enough to cause scrolling. 7951 */ 7952 public void cancelLongPress() { 7953 removeLongPressCallback(); 7954 7955 /* 7956 * The prepressed state handled by the tap callback is a display 7957 * construct, but the tap callback will post a long press callback 7958 * less its own timeout. Remove it here. 7959 */ 7960 removeTapCallback(); 7961 } 7962 7963 /** 7964 * Remove the pending callback for sending a 7965 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7966 */ 7967 private void removeSendViewScrolledAccessibilityEventCallback() { 7968 if (mSendViewScrolledAccessibilityEvent != null) { 7969 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7970 } 7971 } 7972 7973 /** 7974 * Sets the TouchDelegate for this View. 7975 */ 7976 public void setTouchDelegate(TouchDelegate delegate) { 7977 mTouchDelegate = delegate; 7978 } 7979 7980 /** 7981 * Gets the TouchDelegate for this View. 7982 */ 7983 public TouchDelegate getTouchDelegate() { 7984 return mTouchDelegate; 7985 } 7986 7987 /** 7988 * Set flags controlling behavior of this view. 7989 * 7990 * @param flags Constant indicating the value which should be set 7991 * @param mask Constant indicating the bit range that should be changed 7992 */ 7993 void setFlags(int flags, int mask) { 7994 int old = mViewFlags; 7995 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7996 7997 int changed = mViewFlags ^ old; 7998 if (changed == 0) { 7999 return; 8000 } 8001 int privateFlags = mPrivateFlags; 8002 8003 /* Check if the FOCUSABLE bit has changed */ 8004 if (((changed & FOCUSABLE_MASK) != 0) && 8005 ((privateFlags & HAS_BOUNDS) !=0)) { 8006 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8007 && ((privateFlags & FOCUSED) != 0)) { 8008 /* Give up focus if we are no longer focusable */ 8009 clearFocus(); 8010 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8011 && ((privateFlags & FOCUSED) == 0)) { 8012 /* 8013 * Tell the view system that we are now available to take focus 8014 * if no one else already has it. 8015 */ 8016 if (mParent != null) mParent.focusableViewAvailable(this); 8017 } 8018 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8019 notifyAccessibilityStateChanged(); 8020 } 8021 } 8022 8023 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8024 if ((changed & VISIBILITY_MASK) != 0) { 8025 /* 8026 * If this view is becoming visible, invalidate it in case it changed while 8027 * it was not visible. Marking it drawn ensures that the invalidation will 8028 * go through. 8029 */ 8030 mPrivateFlags |= DRAWN; 8031 invalidate(true); 8032 8033 needGlobalAttributesUpdate(true); 8034 8035 // a view becoming visible is worth notifying the parent 8036 // about in case nothing has focus. even if this specific view 8037 // isn't focusable, it may contain something that is, so let 8038 // the root view try to give this focus if nothing else does. 8039 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8040 mParent.focusableViewAvailable(this); 8041 } 8042 } 8043 } 8044 8045 /* Check if the GONE bit has changed */ 8046 if ((changed & GONE) != 0) { 8047 needGlobalAttributesUpdate(false); 8048 requestLayout(); 8049 8050 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8051 if (hasFocus()) clearFocus(); 8052 clearAccessibilityFocus(); 8053 destroyDrawingCache(); 8054 if (mParent instanceof View) { 8055 // GONE views noop invalidation, so invalidate the parent 8056 ((View) mParent).invalidate(true); 8057 } 8058 // Mark the view drawn to ensure that it gets invalidated properly the next 8059 // time it is visible and gets invalidated 8060 mPrivateFlags |= DRAWN; 8061 } 8062 if (mAttachInfo != null) { 8063 mAttachInfo.mViewVisibilityChanged = true; 8064 } 8065 } 8066 8067 /* Check if the VISIBLE bit has changed */ 8068 if ((changed & INVISIBLE) != 0) { 8069 needGlobalAttributesUpdate(false); 8070 /* 8071 * If this view is becoming invisible, set the DRAWN flag so that 8072 * the next invalidate() will not be skipped. 8073 */ 8074 mPrivateFlags |= DRAWN; 8075 8076 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8077 // root view becoming invisible shouldn't clear focus and accessibility focus 8078 if (getRootView() != this) { 8079 clearFocus(); 8080 clearAccessibilityFocus(); 8081 } 8082 } 8083 if (mAttachInfo != null) { 8084 mAttachInfo.mViewVisibilityChanged = true; 8085 } 8086 } 8087 8088 if ((changed & VISIBILITY_MASK) != 0) { 8089 if (mParent instanceof ViewGroup) { 8090 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8091 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8092 ((View) mParent).invalidate(true); 8093 } else if (mParent != null) { 8094 mParent.invalidateChild(this, null); 8095 } 8096 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8097 } 8098 8099 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8100 destroyDrawingCache(); 8101 } 8102 8103 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8104 destroyDrawingCache(); 8105 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8106 invalidateParentCaches(); 8107 } 8108 8109 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8110 destroyDrawingCache(); 8111 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8112 } 8113 8114 if ((changed & DRAW_MASK) != 0) { 8115 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8116 if (mBackground != null) { 8117 mPrivateFlags &= ~SKIP_DRAW; 8118 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8119 } else { 8120 mPrivateFlags |= SKIP_DRAW; 8121 } 8122 } else { 8123 mPrivateFlags &= ~SKIP_DRAW; 8124 } 8125 requestLayout(); 8126 invalidate(true); 8127 } 8128 8129 if ((changed & KEEP_SCREEN_ON) != 0) { 8130 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8131 mParent.recomputeViewAttributes(this); 8132 } 8133 } 8134 8135 if (AccessibilityManager.getInstance(mContext).isEnabled() 8136 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8137 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8138 notifyAccessibilityStateChanged(); 8139 } 8140 } 8141 8142 /** 8143 * Change the view's z order in the tree, so it's on top of other sibling 8144 * views 8145 */ 8146 public void bringToFront() { 8147 if (mParent != null) { 8148 mParent.bringChildToFront(this); 8149 } 8150 } 8151 8152 /** 8153 * This is called in response to an internal scroll in this view (i.e., the 8154 * view scrolled its own contents). This is typically as a result of 8155 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8156 * called. 8157 * 8158 * @param l Current horizontal scroll origin. 8159 * @param t Current vertical scroll origin. 8160 * @param oldl Previous horizontal scroll origin. 8161 * @param oldt Previous vertical scroll origin. 8162 */ 8163 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8164 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8165 postSendViewScrolledAccessibilityEventCallback(); 8166 } 8167 8168 mBackgroundSizeChanged = true; 8169 8170 final AttachInfo ai = mAttachInfo; 8171 if (ai != null) { 8172 ai.mViewScrollChanged = true; 8173 } 8174 } 8175 8176 /** 8177 * Interface definition for a callback to be invoked when the layout bounds of a view 8178 * changes due to layout processing. 8179 */ 8180 public interface OnLayoutChangeListener { 8181 /** 8182 * Called when the focus state of a view has changed. 8183 * 8184 * @param v The view whose state has changed. 8185 * @param left The new value of the view's left property. 8186 * @param top The new value of the view's top property. 8187 * @param right The new value of the view's right property. 8188 * @param bottom The new value of the view's bottom property. 8189 * @param oldLeft The previous value of the view's left property. 8190 * @param oldTop The previous value of the view's top property. 8191 * @param oldRight The previous value of the view's right property. 8192 * @param oldBottom The previous value of the view's bottom property. 8193 */ 8194 void onLayoutChange(View v, int left, int top, int right, int bottom, 8195 int oldLeft, int oldTop, int oldRight, int oldBottom); 8196 } 8197 8198 /** 8199 * This is called during layout when the size of this view has changed. If 8200 * you were just added to the view hierarchy, you're called with the old 8201 * values of 0. 8202 * 8203 * @param w Current width of this view. 8204 * @param h Current height of this view. 8205 * @param oldw Old width of this view. 8206 * @param oldh Old height of this view. 8207 */ 8208 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8209 } 8210 8211 /** 8212 * Called by draw to draw the child views. This may be overridden 8213 * by derived classes to gain control just before its children are drawn 8214 * (but after its own view has been drawn). 8215 * @param canvas the canvas on which to draw the view 8216 */ 8217 protected void dispatchDraw(Canvas canvas) { 8218 8219 } 8220 8221 /** 8222 * Gets the parent of this view. Note that the parent is a 8223 * ViewParent and not necessarily a View. 8224 * 8225 * @return Parent of this view. 8226 */ 8227 public final ViewParent getParent() { 8228 return mParent; 8229 } 8230 8231 /** 8232 * Set the horizontal scrolled position of your view. This will cause a call to 8233 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8234 * invalidated. 8235 * @param value the x position to scroll to 8236 */ 8237 public void setScrollX(int value) { 8238 scrollTo(value, mScrollY); 8239 } 8240 8241 /** 8242 * Set the vertical scrolled position of your view. This will cause a call to 8243 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8244 * invalidated. 8245 * @param value the y position to scroll to 8246 */ 8247 public void setScrollY(int value) { 8248 scrollTo(mScrollX, value); 8249 } 8250 8251 /** 8252 * Return the scrolled left position of this view. This is the left edge of 8253 * the displayed part of your view. You do not need to draw any pixels 8254 * farther left, since those are outside of the frame of your view on 8255 * screen. 8256 * 8257 * @return The left edge of the displayed part of your view, in pixels. 8258 */ 8259 public final int getScrollX() { 8260 return mScrollX; 8261 } 8262 8263 /** 8264 * Return the scrolled top position of this view. This is the top edge of 8265 * the displayed part of your view. You do not need to draw any pixels above 8266 * it, since those are outside of the frame of your view on screen. 8267 * 8268 * @return The top edge of the displayed part of your view, in pixels. 8269 */ 8270 public final int getScrollY() { 8271 return mScrollY; 8272 } 8273 8274 /** 8275 * Return the width of the your view. 8276 * 8277 * @return The width of your view, in pixels. 8278 */ 8279 @ViewDebug.ExportedProperty(category = "layout") 8280 public final int getWidth() { 8281 return mRight - mLeft; 8282 } 8283 8284 /** 8285 * Return the height of your view. 8286 * 8287 * @return The height of your view, in pixels. 8288 */ 8289 @ViewDebug.ExportedProperty(category = "layout") 8290 public final int getHeight() { 8291 return mBottom - mTop; 8292 } 8293 8294 /** 8295 * Return the visible drawing bounds of your view. Fills in the output 8296 * rectangle with the values from getScrollX(), getScrollY(), 8297 * getWidth(), and getHeight(). 8298 * 8299 * @param outRect The (scrolled) drawing bounds of the view. 8300 */ 8301 public void getDrawingRect(Rect outRect) { 8302 outRect.left = mScrollX; 8303 outRect.top = mScrollY; 8304 outRect.right = mScrollX + (mRight - mLeft); 8305 outRect.bottom = mScrollY + (mBottom - mTop); 8306 } 8307 8308 /** 8309 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8310 * raw width component (that is the result is masked by 8311 * {@link #MEASURED_SIZE_MASK}). 8312 * 8313 * @return The raw measured width of this view. 8314 */ 8315 public final int getMeasuredWidth() { 8316 return mMeasuredWidth & MEASURED_SIZE_MASK; 8317 } 8318 8319 /** 8320 * Return the full width measurement information for this view as computed 8321 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8322 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8323 * This should be used during measurement and layout calculations only. Use 8324 * {@link #getWidth()} to see how wide a view is after layout. 8325 * 8326 * @return The measured width of this view as a bit mask. 8327 */ 8328 public final int getMeasuredWidthAndState() { 8329 return mMeasuredWidth; 8330 } 8331 8332 /** 8333 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8334 * raw width component (that is the result is masked by 8335 * {@link #MEASURED_SIZE_MASK}). 8336 * 8337 * @return The raw measured height of this view. 8338 */ 8339 public final int getMeasuredHeight() { 8340 return mMeasuredHeight & MEASURED_SIZE_MASK; 8341 } 8342 8343 /** 8344 * Return the full height measurement information for this view as computed 8345 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8346 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8347 * This should be used during measurement and layout calculations only. Use 8348 * {@link #getHeight()} to see how wide a view is after layout. 8349 * 8350 * @return The measured width of this view as a bit mask. 8351 */ 8352 public final int getMeasuredHeightAndState() { 8353 return mMeasuredHeight; 8354 } 8355 8356 /** 8357 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8358 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8359 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8360 * and the height component is at the shifted bits 8361 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8362 */ 8363 public final int getMeasuredState() { 8364 return (mMeasuredWidth&MEASURED_STATE_MASK) 8365 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8366 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8367 } 8368 8369 /** 8370 * The transform matrix of this view, which is calculated based on the current 8371 * roation, scale, and pivot properties. 8372 * 8373 * @see #getRotation() 8374 * @see #getScaleX() 8375 * @see #getScaleY() 8376 * @see #getPivotX() 8377 * @see #getPivotY() 8378 * @return The current transform matrix for the view 8379 */ 8380 public Matrix getMatrix() { 8381 if (mTransformationInfo != null) { 8382 updateMatrix(); 8383 return mTransformationInfo.mMatrix; 8384 } 8385 return Matrix.IDENTITY_MATRIX; 8386 } 8387 8388 /** 8389 * Utility function to determine if the value is far enough away from zero to be 8390 * considered non-zero. 8391 * @param value A floating point value to check for zero-ness 8392 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8393 */ 8394 private static boolean nonzero(float value) { 8395 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8396 } 8397 8398 /** 8399 * Returns true if the transform matrix is the identity matrix. 8400 * Recomputes the matrix if necessary. 8401 * 8402 * @return True if the transform matrix is the identity matrix, false otherwise. 8403 */ 8404 final boolean hasIdentityMatrix() { 8405 if (mTransformationInfo != null) { 8406 updateMatrix(); 8407 return mTransformationInfo.mMatrixIsIdentity; 8408 } 8409 return true; 8410 } 8411 8412 void ensureTransformationInfo() { 8413 if (mTransformationInfo == null) { 8414 mTransformationInfo = new TransformationInfo(); 8415 } 8416 } 8417 8418 /** 8419 * Recomputes the transform matrix if necessary. 8420 */ 8421 private void updateMatrix() { 8422 final TransformationInfo info = mTransformationInfo; 8423 if (info == null) { 8424 return; 8425 } 8426 if (info.mMatrixDirty) { 8427 // transform-related properties have changed since the last time someone 8428 // asked for the matrix; recalculate it with the current values 8429 8430 // Figure out if we need to update the pivot point 8431 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8432 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8433 info.mPrevWidth = mRight - mLeft; 8434 info.mPrevHeight = mBottom - mTop; 8435 info.mPivotX = info.mPrevWidth / 2f; 8436 info.mPivotY = info.mPrevHeight / 2f; 8437 } 8438 } 8439 info.mMatrix.reset(); 8440 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8441 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8442 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8443 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8444 } else { 8445 if (info.mCamera == null) { 8446 info.mCamera = new Camera(); 8447 info.matrix3D = new Matrix(); 8448 } 8449 info.mCamera.save(); 8450 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8451 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8452 info.mCamera.getMatrix(info.matrix3D); 8453 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8454 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8455 info.mPivotY + info.mTranslationY); 8456 info.mMatrix.postConcat(info.matrix3D); 8457 info.mCamera.restore(); 8458 } 8459 info.mMatrixDirty = false; 8460 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8461 info.mInverseMatrixDirty = true; 8462 } 8463 } 8464 8465 /** 8466 * Utility method to retrieve the inverse of the current mMatrix property. 8467 * We cache the matrix to avoid recalculating it when transform properties 8468 * have not changed. 8469 * 8470 * @return The inverse of the current matrix of this view. 8471 */ 8472 final Matrix getInverseMatrix() { 8473 final TransformationInfo info = mTransformationInfo; 8474 if (info != null) { 8475 updateMatrix(); 8476 if (info.mInverseMatrixDirty) { 8477 if (info.mInverseMatrix == null) { 8478 info.mInverseMatrix = new Matrix(); 8479 } 8480 info.mMatrix.invert(info.mInverseMatrix); 8481 info.mInverseMatrixDirty = false; 8482 } 8483 return info.mInverseMatrix; 8484 } 8485 return Matrix.IDENTITY_MATRIX; 8486 } 8487 8488 /** 8489 * Gets the distance along the Z axis from the camera to this view. 8490 * 8491 * @see #setCameraDistance(float) 8492 * 8493 * @return The distance along the Z axis. 8494 */ 8495 public float getCameraDistance() { 8496 ensureTransformationInfo(); 8497 final float dpi = mResources.getDisplayMetrics().densityDpi; 8498 final TransformationInfo info = mTransformationInfo; 8499 if (info.mCamera == null) { 8500 info.mCamera = new Camera(); 8501 info.matrix3D = new Matrix(); 8502 } 8503 return -(info.mCamera.getLocationZ() * dpi); 8504 } 8505 8506 /** 8507 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8508 * views are drawn) from the camera to this view. The camera's distance 8509 * affects 3D transformations, for instance rotations around the X and Y 8510 * axis. If the rotationX or rotationY properties are changed and this view is 8511 * large (more than half the size of the screen), it is recommended to always 8512 * use a camera distance that's greater than the height (X axis rotation) or 8513 * the width (Y axis rotation) of this view.</p> 8514 * 8515 * <p>The distance of the camera from the view plane can have an affect on the 8516 * perspective distortion of the view when it is rotated around the x or y axis. 8517 * For example, a large distance will result in a large viewing angle, and there 8518 * will not be much perspective distortion of the view as it rotates. A short 8519 * distance may cause much more perspective distortion upon rotation, and can 8520 * also result in some drawing artifacts if the rotated view ends up partially 8521 * behind the camera (which is why the recommendation is to use a distance at 8522 * least as far as the size of the view, if the view is to be rotated.)</p> 8523 * 8524 * <p>The distance is expressed in "depth pixels." The default distance depends 8525 * on the screen density. For instance, on a medium density display, the 8526 * default distance is 1280. On a high density display, the default distance 8527 * is 1920.</p> 8528 * 8529 * <p>If you want to specify a distance that leads to visually consistent 8530 * results across various densities, use the following formula:</p> 8531 * <pre> 8532 * float scale = context.getResources().getDisplayMetrics().density; 8533 * view.setCameraDistance(distance * scale); 8534 * </pre> 8535 * 8536 * <p>The density scale factor of a high density display is 1.5, 8537 * and 1920 = 1280 * 1.5.</p> 8538 * 8539 * @param distance The distance in "depth pixels", if negative the opposite 8540 * value is used 8541 * 8542 * @see #setRotationX(float) 8543 * @see #setRotationY(float) 8544 */ 8545 public void setCameraDistance(float distance) { 8546 invalidateViewProperty(true, false); 8547 8548 ensureTransformationInfo(); 8549 final float dpi = mResources.getDisplayMetrics().densityDpi; 8550 final TransformationInfo info = mTransformationInfo; 8551 if (info.mCamera == null) { 8552 info.mCamera = new Camera(); 8553 info.matrix3D = new Matrix(); 8554 } 8555 8556 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8557 info.mMatrixDirty = true; 8558 8559 invalidateViewProperty(false, false); 8560 if (mDisplayList != null) { 8561 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8562 } 8563 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8564 // View was rejected last time it was drawn by its parent; this may have changed 8565 invalidateParentIfNeeded(); 8566 } 8567 } 8568 8569 /** 8570 * The degrees that the view is rotated around the pivot point. 8571 * 8572 * @see #setRotation(float) 8573 * @see #getPivotX() 8574 * @see #getPivotY() 8575 * 8576 * @return The degrees of rotation. 8577 */ 8578 @ViewDebug.ExportedProperty(category = "drawing") 8579 public float getRotation() { 8580 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8581 } 8582 8583 /** 8584 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8585 * result in clockwise rotation. 8586 * 8587 * @param rotation The degrees of rotation. 8588 * 8589 * @see #getRotation() 8590 * @see #getPivotX() 8591 * @see #getPivotY() 8592 * @see #setRotationX(float) 8593 * @see #setRotationY(float) 8594 * 8595 * @attr ref android.R.styleable#View_rotation 8596 */ 8597 public void setRotation(float rotation) { 8598 ensureTransformationInfo(); 8599 final TransformationInfo info = mTransformationInfo; 8600 if (info.mRotation != rotation) { 8601 // Double-invalidation is necessary to capture view's old and new areas 8602 invalidateViewProperty(true, false); 8603 info.mRotation = rotation; 8604 info.mMatrixDirty = true; 8605 invalidateViewProperty(false, true); 8606 if (mDisplayList != null) { 8607 mDisplayList.setRotation(rotation); 8608 } 8609 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8610 // View was rejected last time it was drawn by its parent; this may have changed 8611 invalidateParentIfNeeded(); 8612 } 8613 } 8614 } 8615 8616 /** 8617 * The degrees that the view is rotated around the vertical axis through the pivot point. 8618 * 8619 * @see #getPivotX() 8620 * @see #getPivotY() 8621 * @see #setRotationY(float) 8622 * 8623 * @return The degrees of Y rotation. 8624 */ 8625 @ViewDebug.ExportedProperty(category = "drawing") 8626 public float getRotationY() { 8627 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8628 } 8629 8630 /** 8631 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8632 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8633 * down the y axis. 8634 * 8635 * When rotating large views, it is recommended to adjust the camera distance 8636 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8637 * 8638 * @param rotationY The degrees of Y rotation. 8639 * 8640 * @see #getRotationY() 8641 * @see #getPivotX() 8642 * @see #getPivotY() 8643 * @see #setRotation(float) 8644 * @see #setRotationX(float) 8645 * @see #setCameraDistance(float) 8646 * 8647 * @attr ref android.R.styleable#View_rotationY 8648 */ 8649 public void setRotationY(float rotationY) { 8650 ensureTransformationInfo(); 8651 final TransformationInfo info = mTransformationInfo; 8652 if (info.mRotationY != rotationY) { 8653 invalidateViewProperty(true, false); 8654 info.mRotationY = rotationY; 8655 info.mMatrixDirty = true; 8656 invalidateViewProperty(false, true); 8657 if (mDisplayList != null) { 8658 mDisplayList.setRotationY(rotationY); 8659 } 8660 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8661 // View was rejected last time it was drawn by its parent; this may have changed 8662 invalidateParentIfNeeded(); 8663 } 8664 } 8665 } 8666 8667 /** 8668 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8669 * 8670 * @see #getPivotX() 8671 * @see #getPivotY() 8672 * @see #setRotationX(float) 8673 * 8674 * @return The degrees of X rotation. 8675 */ 8676 @ViewDebug.ExportedProperty(category = "drawing") 8677 public float getRotationX() { 8678 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8679 } 8680 8681 /** 8682 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8683 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8684 * x axis. 8685 * 8686 * When rotating large views, it is recommended to adjust the camera distance 8687 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8688 * 8689 * @param rotationX The degrees of X rotation. 8690 * 8691 * @see #getRotationX() 8692 * @see #getPivotX() 8693 * @see #getPivotY() 8694 * @see #setRotation(float) 8695 * @see #setRotationY(float) 8696 * @see #setCameraDistance(float) 8697 * 8698 * @attr ref android.R.styleable#View_rotationX 8699 */ 8700 public void setRotationX(float rotationX) { 8701 ensureTransformationInfo(); 8702 final TransformationInfo info = mTransformationInfo; 8703 if (info.mRotationX != rotationX) { 8704 invalidateViewProperty(true, false); 8705 info.mRotationX = rotationX; 8706 info.mMatrixDirty = true; 8707 invalidateViewProperty(false, true); 8708 if (mDisplayList != null) { 8709 mDisplayList.setRotationX(rotationX); 8710 } 8711 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8712 // View was rejected last time it was drawn by its parent; this may have changed 8713 invalidateParentIfNeeded(); 8714 } 8715 } 8716 } 8717 8718 /** 8719 * The amount that the view is scaled in x around the pivot point, as a proportion of 8720 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8721 * 8722 * <p>By default, this is 1.0f. 8723 * 8724 * @see #getPivotX() 8725 * @see #getPivotY() 8726 * @return The scaling factor. 8727 */ 8728 @ViewDebug.ExportedProperty(category = "drawing") 8729 public float getScaleX() { 8730 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8731 } 8732 8733 /** 8734 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8735 * the view's unscaled width. A value of 1 means that no scaling is applied. 8736 * 8737 * @param scaleX The scaling factor. 8738 * @see #getPivotX() 8739 * @see #getPivotY() 8740 * 8741 * @attr ref android.R.styleable#View_scaleX 8742 */ 8743 public void setScaleX(float scaleX) { 8744 ensureTransformationInfo(); 8745 final TransformationInfo info = mTransformationInfo; 8746 if (info.mScaleX != scaleX) { 8747 invalidateViewProperty(true, false); 8748 info.mScaleX = scaleX; 8749 info.mMatrixDirty = true; 8750 invalidateViewProperty(false, true); 8751 if (mDisplayList != null) { 8752 mDisplayList.setScaleX(scaleX); 8753 } 8754 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8755 // View was rejected last time it was drawn by its parent; this may have changed 8756 invalidateParentIfNeeded(); 8757 } 8758 } 8759 } 8760 8761 /** 8762 * The amount that the view is scaled in y around the pivot point, as a proportion of 8763 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8764 * 8765 * <p>By default, this is 1.0f. 8766 * 8767 * @see #getPivotX() 8768 * @see #getPivotY() 8769 * @return The scaling factor. 8770 */ 8771 @ViewDebug.ExportedProperty(category = "drawing") 8772 public float getScaleY() { 8773 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8774 } 8775 8776 /** 8777 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8778 * the view's unscaled width. A value of 1 means that no scaling is applied. 8779 * 8780 * @param scaleY The scaling factor. 8781 * @see #getPivotX() 8782 * @see #getPivotY() 8783 * 8784 * @attr ref android.R.styleable#View_scaleY 8785 */ 8786 public void setScaleY(float scaleY) { 8787 ensureTransformationInfo(); 8788 final TransformationInfo info = mTransformationInfo; 8789 if (info.mScaleY != scaleY) { 8790 invalidateViewProperty(true, false); 8791 info.mScaleY = scaleY; 8792 info.mMatrixDirty = true; 8793 invalidateViewProperty(false, true); 8794 if (mDisplayList != null) { 8795 mDisplayList.setScaleY(scaleY); 8796 } 8797 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8798 // View was rejected last time it was drawn by its parent; this may have changed 8799 invalidateParentIfNeeded(); 8800 } 8801 } 8802 } 8803 8804 /** 8805 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8806 * and {@link #setScaleX(float) scaled}. 8807 * 8808 * @see #getRotation() 8809 * @see #getScaleX() 8810 * @see #getScaleY() 8811 * @see #getPivotY() 8812 * @return The x location of the pivot point. 8813 * 8814 * @attr ref android.R.styleable#View_transformPivotX 8815 */ 8816 @ViewDebug.ExportedProperty(category = "drawing") 8817 public float getPivotX() { 8818 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8819 } 8820 8821 /** 8822 * Sets the x location of the point around which the view is 8823 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8824 * By default, the pivot point is centered on the object. 8825 * Setting this property disables this behavior and causes the view to use only the 8826 * explicitly set pivotX and pivotY values. 8827 * 8828 * @param pivotX The x location of the pivot point. 8829 * @see #getRotation() 8830 * @see #getScaleX() 8831 * @see #getScaleY() 8832 * @see #getPivotY() 8833 * 8834 * @attr ref android.R.styleable#View_transformPivotX 8835 */ 8836 public void setPivotX(float pivotX) { 8837 ensureTransformationInfo(); 8838 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8839 final TransformationInfo info = mTransformationInfo; 8840 if (info.mPivotX != pivotX) { 8841 invalidateViewProperty(true, false); 8842 info.mPivotX = pivotX; 8843 info.mMatrixDirty = true; 8844 invalidateViewProperty(false, true); 8845 if (mDisplayList != null) { 8846 mDisplayList.setPivotX(pivotX); 8847 } 8848 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8849 // View was rejected last time it was drawn by its parent; this may have changed 8850 invalidateParentIfNeeded(); 8851 } 8852 } 8853 } 8854 8855 /** 8856 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8857 * and {@link #setScaleY(float) scaled}. 8858 * 8859 * @see #getRotation() 8860 * @see #getScaleX() 8861 * @see #getScaleY() 8862 * @see #getPivotY() 8863 * @return The y location of the pivot point. 8864 * 8865 * @attr ref android.R.styleable#View_transformPivotY 8866 */ 8867 @ViewDebug.ExportedProperty(category = "drawing") 8868 public float getPivotY() { 8869 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8870 } 8871 8872 /** 8873 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8874 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8875 * Setting this property disables this behavior and causes the view to use only the 8876 * explicitly set pivotX and pivotY values. 8877 * 8878 * @param pivotY The y location of the pivot point. 8879 * @see #getRotation() 8880 * @see #getScaleX() 8881 * @see #getScaleY() 8882 * @see #getPivotY() 8883 * 8884 * @attr ref android.R.styleable#View_transformPivotY 8885 */ 8886 public void setPivotY(float pivotY) { 8887 ensureTransformationInfo(); 8888 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8889 final TransformationInfo info = mTransformationInfo; 8890 if (info.mPivotY != pivotY) { 8891 invalidateViewProperty(true, false); 8892 info.mPivotY = pivotY; 8893 info.mMatrixDirty = true; 8894 invalidateViewProperty(false, true); 8895 if (mDisplayList != null) { 8896 mDisplayList.setPivotY(pivotY); 8897 } 8898 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8899 // View was rejected last time it was drawn by its parent; this may have changed 8900 invalidateParentIfNeeded(); 8901 } 8902 } 8903 } 8904 8905 /** 8906 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8907 * completely transparent and 1 means the view is completely opaque. 8908 * 8909 * <p>By default this is 1.0f. 8910 * @return The opacity of the view. 8911 */ 8912 @ViewDebug.ExportedProperty(category = "drawing") 8913 public float getAlpha() { 8914 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8915 } 8916 8917 /** 8918 * Returns whether this View has content which overlaps. This function, intended to be 8919 * overridden by specific View types, is an optimization when alpha is set on a view. If 8920 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8921 * and then composited it into place, which can be expensive. If the view has no overlapping 8922 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8923 * An example of overlapping rendering is a TextView with a background image, such as a 8924 * Button. An example of non-overlapping rendering is a TextView with no background, or 8925 * an ImageView with only the foreground image. The default implementation returns true; 8926 * subclasses should override if they have cases which can be optimized. 8927 * 8928 * @return true if the content in this view might overlap, false otherwise. 8929 */ 8930 public boolean hasOverlappingRendering() { 8931 return true; 8932 } 8933 8934 /** 8935 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8936 * completely transparent and 1 means the view is completely opaque.</p> 8937 * 8938 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8939 * responsible for applying the opacity itself. Otherwise, calling this method is 8940 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8941 * setting a hardware layer.</p> 8942 * 8943 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8944 * performance implications. It is generally best to use the alpha property sparingly and 8945 * transiently, as in the case of fading animations.</p> 8946 * 8947 * @param alpha The opacity of the view. 8948 * 8949 * @see #setLayerType(int, android.graphics.Paint) 8950 * 8951 * @attr ref android.R.styleable#View_alpha 8952 */ 8953 public void setAlpha(float alpha) { 8954 ensureTransformationInfo(); 8955 if (mTransformationInfo.mAlpha != alpha) { 8956 mTransformationInfo.mAlpha = alpha; 8957 if (onSetAlpha((int) (alpha * 255))) { 8958 mPrivateFlags |= ALPHA_SET; 8959 // subclass is handling alpha - don't optimize rendering cache invalidation 8960 invalidateParentCaches(); 8961 invalidate(true); 8962 } else { 8963 mPrivateFlags &= ~ALPHA_SET; 8964 invalidateViewProperty(true, false); 8965 if (mDisplayList != null) { 8966 mDisplayList.setAlpha(alpha); 8967 } 8968 } 8969 } 8970 } 8971 8972 /** 8973 * Faster version of setAlpha() which performs the same steps except there are 8974 * no calls to invalidate(). The caller of this function should perform proper invalidation 8975 * on the parent and this object. The return value indicates whether the subclass handles 8976 * alpha (the return value for onSetAlpha()). 8977 * 8978 * @param alpha The new value for the alpha property 8979 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8980 * the new value for the alpha property is different from the old value 8981 */ 8982 boolean setAlphaNoInvalidation(float alpha) { 8983 ensureTransformationInfo(); 8984 if (mTransformationInfo.mAlpha != alpha) { 8985 mTransformationInfo.mAlpha = alpha; 8986 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8987 if (subclassHandlesAlpha) { 8988 mPrivateFlags |= ALPHA_SET; 8989 return true; 8990 } else { 8991 mPrivateFlags &= ~ALPHA_SET; 8992 if (mDisplayList != null) { 8993 mDisplayList.setAlpha(alpha); 8994 } 8995 } 8996 } 8997 return false; 8998 } 8999 9000 /** 9001 * Top position of this view relative to its parent. 9002 * 9003 * @return The top of this view, in pixels. 9004 */ 9005 @ViewDebug.CapturedViewProperty 9006 public final int getTop() { 9007 return mTop; 9008 } 9009 9010 /** 9011 * Sets the top position of this view relative to its parent. This method is meant to be called 9012 * by the layout system and should not generally be called otherwise, because the property 9013 * may be changed at any time by the layout. 9014 * 9015 * @param top The top of this view, in pixels. 9016 */ 9017 public final void setTop(int top) { 9018 if (top != mTop) { 9019 updateMatrix(); 9020 final boolean matrixIsIdentity = mTransformationInfo == null 9021 || mTransformationInfo.mMatrixIsIdentity; 9022 if (matrixIsIdentity) { 9023 if (mAttachInfo != null) { 9024 int minTop; 9025 int yLoc; 9026 if (top < mTop) { 9027 minTop = top; 9028 yLoc = top - mTop; 9029 } else { 9030 minTop = mTop; 9031 yLoc = 0; 9032 } 9033 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9034 } 9035 } else { 9036 // Double-invalidation is necessary to capture view's old and new areas 9037 invalidate(true); 9038 } 9039 9040 int width = mRight - mLeft; 9041 int oldHeight = mBottom - mTop; 9042 9043 mTop = top; 9044 if (mDisplayList != null) { 9045 mDisplayList.setTop(mTop); 9046 } 9047 9048 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9049 9050 if (!matrixIsIdentity) { 9051 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9052 // A change in dimension means an auto-centered pivot point changes, too 9053 mTransformationInfo.mMatrixDirty = true; 9054 } 9055 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9056 invalidate(true); 9057 } 9058 mBackgroundSizeChanged = true; 9059 invalidateParentIfNeeded(); 9060 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9061 // View was rejected last time it was drawn by its parent; this may have changed 9062 invalidateParentIfNeeded(); 9063 } 9064 } 9065 } 9066 9067 /** 9068 * Bottom position of this view relative to its parent. 9069 * 9070 * @return The bottom of this view, in pixels. 9071 */ 9072 @ViewDebug.CapturedViewProperty 9073 public final int getBottom() { 9074 return mBottom; 9075 } 9076 9077 /** 9078 * True if this view has changed since the last time being drawn. 9079 * 9080 * @return The dirty state of this view. 9081 */ 9082 public boolean isDirty() { 9083 return (mPrivateFlags & DIRTY_MASK) != 0; 9084 } 9085 9086 /** 9087 * Sets the bottom position of this view relative to its parent. This method is meant to be 9088 * called by the layout system and should not generally be called otherwise, because the 9089 * property may be changed at any time by the layout. 9090 * 9091 * @param bottom The bottom of this view, in pixels. 9092 */ 9093 public final void setBottom(int bottom) { 9094 if (bottom != mBottom) { 9095 updateMatrix(); 9096 final boolean matrixIsIdentity = mTransformationInfo == null 9097 || mTransformationInfo.mMatrixIsIdentity; 9098 if (matrixIsIdentity) { 9099 if (mAttachInfo != null) { 9100 int maxBottom; 9101 if (bottom < mBottom) { 9102 maxBottom = mBottom; 9103 } else { 9104 maxBottom = bottom; 9105 } 9106 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9107 } 9108 } else { 9109 // Double-invalidation is necessary to capture view's old and new areas 9110 invalidate(true); 9111 } 9112 9113 int width = mRight - mLeft; 9114 int oldHeight = mBottom - mTop; 9115 9116 mBottom = bottom; 9117 if (mDisplayList != null) { 9118 mDisplayList.setBottom(mBottom); 9119 } 9120 9121 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9122 9123 if (!matrixIsIdentity) { 9124 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9125 // A change in dimension means an auto-centered pivot point changes, too 9126 mTransformationInfo.mMatrixDirty = true; 9127 } 9128 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9129 invalidate(true); 9130 } 9131 mBackgroundSizeChanged = true; 9132 invalidateParentIfNeeded(); 9133 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9134 // View was rejected last time it was drawn by its parent; this may have changed 9135 invalidateParentIfNeeded(); 9136 } 9137 } 9138 } 9139 9140 /** 9141 * Left position of this view relative to its parent. 9142 * 9143 * @return The left edge of this view, in pixels. 9144 */ 9145 @ViewDebug.CapturedViewProperty 9146 public final int getLeft() { 9147 return mLeft; 9148 } 9149 9150 /** 9151 * Sets the left position of this view relative to its parent. This method is meant to be called 9152 * by the layout system and should not generally be called otherwise, because the property 9153 * may be changed at any time by the layout. 9154 * 9155 * @param left The bottom of this view, in pixels. 9156 */ 9157 public final void setLeft(int left) { 9158 if (left != mLeft) { 9159 updateMatrix(); 9160 final boolean matrixIsIdentity = mTransformationInfo == null 9161 || mTransformationInfo.mMatrixIsIdentity; 9162 if (matrixIsIdentity) { 9163 if (mAttachInfo != null) { 9164 int minLeft; 9165 int xLoc; 9166 if (left < mLeft) { 9167 minLeft = left; 9168 xLoc = left - mLeft; 9169 } else { 9170 minLeft = mLeft; 9171 xLoc = 0; 9172 } 9173 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9174 } 9175 } else { 9176 // Double-invalidation is necessary to capture view's old and new areas 9177 invalidate(true); 9178 } 9179 9180 int oldWidth = mRight - mLeft; 9181 int height = mBottom - mTop; 9182 9183 mLeft = left; 9184 if (mDisplayList != null) { 9185 mDisplayList.setLeft(left); 9186 } 9187 9188 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9189 9190 if (!matrixIsIdentity) { 9191 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9192 // A change in dimension means an auto-centered pivot point changes, too 9193 mTransformationInfo.mMatrixDirty = true; 9194 } 9195 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9196 invalidate(true); 9197 } 9198 mBackgroundSizeChanged = true; 9199 invalidateParentIfNeeded(); 9200 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9201 // View was rejected last time it was drawn by its parent; this may have changed 9202 invalidateParentIfNeeded(); 9203 } 9204 } 9205 } 9206 9207 /** 9208 * Right position of this view relative to its parent. 9209 * 9210 * @return The right edge of this view, in pixels. 9211 */ 9212 @ViewDebug.CapturedViewProperty 9213 public final int getRight() { 9214 return mRight; 9215 } 9216 9217 /** 9218 * Sets the right position of this view relative to its parent. This method is meant to be called 9219 * by the layout system and should not generally be called otherwise, because the property 9220 * may be changed at any time by the layout. 9221 * 9222 * @param right The bottom of this view, in pixels. 9223 */ 9224 public final void setRight(int right) { 9225 if (right != mRight) { 9226 updateMatrix(); 9227 final boolean matrixIsIdentity = mTransformationInfo == null 9228 || mTransformationInfo.mMatrixIsIdentity; 9229 if (matrixIsIdentity) { 9230 if (mAttachInfo != null) { 9231 int maxRight; 9232 if (right < mRight) { 9233 maxRight = mRight; 9234 } else { 9235 maxRight = right; 9236 } 9237 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9238 } 9239 } else { 9240 // Double-invalidation is necessary to capture view's old and new areas 9241 invalidate(true); 9242 } 9243 9244 int oldWidth = mRight - mLeft; 9245 int height = mBottom - mTop; 9246 9247 mRight = right; 9248 if (mDisplayList != null) { 9249 mDisplayList.setRight(mRight); 9250 } 9251 9252 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9253 9254 if (!matrixIsIdentity) { 9255 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9256 // A change in dimension means an auto-centered pivot point changes, too 9257 mTransformationInfo.mMatrixDirty = true; 9258 } 9259 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9260 invalidate(true); 9261 } 9262 mBackgroundSizeChanged = true; 9263 invalidateParentIfNeeded(); 9264 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9265 // View was rejected last time it was drawn by its parent; this may have changed 9266 invalidateParentIfNeeded(); 9267 } 9268 } 9269 } 9270 9271 /** 9272 * The visual x position of this view, in pixels. This is equivalent to the 9273 * {@link #setTranslationX(float) translationX} property plus the current 9274 * {@link #getLeft() left} property. 9275 * 9276 * @return The visual x position of this view, in pixels. 9277 */ 9278 @ViewDebug.ExportedProperty(category = "drawing") 9279 public float getX() { 9280 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9281 } 9282 9283 /** 9284 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9285 * {@link #setTranslationX(float) translationX} property to be the difference between 9286 * the x value passed in and the current {@link #getLeft() left} property. 9287 * 9288 * @param x The visual x position of this view, in pixels. 9289 */ 9290 public void setX(float x) { 9291 setTranslationX(x - mLeft); 9292 } 9293 9294 /** 9295 * The visual y position of this view, in pixels. This is equivalent to the 9296 * {@link #setTranslationY(float) translationY} property plus the current 9297 * {@link #getTop() top} property. 9298 * 9299 * @return The visual y position of this view, in pixels. 9300 */ 9301 @ViewDebug.ExportedProperty(category = "drawing") 9302 public float getY() { 9303 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9304 } 9305 9306 /** 9307 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9308 * {@link #setTranslationY(float) translationY} property to be the difference between 9309 * the y value passed in and the current {@link #getTop() top} property. 9310 * 9311 * @param y The visual y position of this view, in pixels. 9312 */ 9313 public void setY(float y) { 9314 setTranslationY(y - mTop); 9315 } 9316 9317 9318 /** 9319 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9320 * This position is post-layout, in addition to wherever the object's 9321 * layout placed it. 9322 * 9323 * @return The horizontal position of this view relative to its left position, in pixels. 9324 */ 9325 @ViewDebug.ExportedProperty(category = "drawing") 9326 public float getTranslationX() { 9327 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9328 } 9329 9330 /** 9331 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9332 * This effectively positions the object post-layout, in addition to wherever the object's 9333 * layout placed it. 9334 * 9335 * @param translationX The horizontal position of this view relative to its left position, 9336 * in pixels. 9337 * 9338 * @attr ref android.R.styleable#View_translationX 9339 */ 9340 public void setTranslationX(float translationX) { 9341 ensureTransformationInfo(); 9342 final TransformationInfo info = mTransformationInfo; 9343 if (info.mTranslationX != translationX) { 9344 // Double-invalidation is necessary to capture view's old and new areas 9345 invalidateViewProperty(true, false); 9346 info.mTranslationX = translationX; 9347 info.mMatrixDirty = true; 9348 invalidateViewProperty(false, true); 9349 if (mDisplayList != null) { 9350 mDisplayList.setTranslationX(translationX); 9351 } 9352 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9353 // View was rejected last time it was drawn by its parent; this may have changed 9354 invalidateParentIfNeeded(); 9355 } 9356 } 9357 } 9358 9359 /** 9360 * The horizontal location of this view relative to its {@link #getTop() top} position. 9361 * This position is post-layout, in addition to wherever the object's 9362 * layout placed it. 9363 * 9364 * @return The vertical position of this view relative to its top position, 9365 * in pixels. 9366 */ 9367 @ViewDebug.ExportedProperty(category = "drawing") 9368 public float getTranslationY() { 9369 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9370 } 9371 9372 /** 9373 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9374 * This effectively positions the object post-layout, in addition to wherever the object's 9375 * layout placed it. 9376 * 9377 * @param translationY The vertical position of this view relative to its top position, 9378 * in pixels. 9379 * 9380 * @attr ref android.R.styleable#View_translationY 9381 */ 9382 public void setTranslationY(float translationY) { 9383 ensureTransformationInfo(); 9384 final TransformationInfo info = mTransformationInfo; 9385 if (info.mTranslationY != translationY) { 9386 invalidateViewProperty(true, false); 9387 info.mTranslationY = translationY; 9388 info.mMatrixDirty = true; 9389 invalidateViewProperty(false, true); 9390 if (mDisplayList != null) { 9391 mDisplayList.setTranslationY(translationY); 9392 } 9393 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9394 // View was rejected last time it was drawn by its parent; this may have changed 9395 invalidateParentIfNeeded(); 9396 } 9397 } 9398 } 9399 9400 /** 9401 * Hit rectangle in parent's coordinates 9402 * 9403 * @param outRect The hit rectangle of the view. 9404 */ 9405 public void getHitRect(Rect outRect) { 9406 updateMatrix(); 9407 final TransformationInfo info = mTransformationInfo; 9408 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9409 outRect.set(mLeft, mTop, mRight, mBottom); 9410 } else { 9411 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9412 tmpRect.set(-info.mPivotX, -info.mPivotY, 9413 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9414 info.mMatrix.mapRect(tmpRect); 9415 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9416 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9417 } 9418 } 9419 9420 /** 9421 * Determines whether the given point, in local coordinates is inside the view. 9422 */ 9423 /*package*/ final boolean pointInView(float localX, float localY) { 9424 return localX >= 0 && localX < (mRight - mLeft) 9425 && localY >= 0 && localY < (mBottom - mTop); 9426 } 9427 9428 /** 9429 * Utility method to determine whether the given point, in local coordinates, 9430 * is inside the view, where the area of the view is expanded by the slop factor. 9431 * This method is called while processing touch-move events to determine if the event 9432 * is still within the view. 9433 */ 9434 private boolean pointInView(float localX, float localY, float slop) { 9435 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9436 localY < ((mBottom - mTop) + slop); 9437 } 9438 9439 /** 9440 * When a view has focus and the user navigates away from it, the next view is searched for 9441 * starting from the rectangle filled in by this method. 9442 * 9443 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9444 * of the view. However, if your view maintains some idea of internal selection, 9445 * such as a cursor, or a selected row or column, you should override this method and 9446 * fill in a more specific rectangle. 9447 * 9448 * @param r The rectangle to fill in, in this view's coordinates. 9449 */ 9450 public void getFocusedRect(Rect r) { 9451 getDrawingRect(r); 9452 } 9453 9454 /** 9455 * If some part of this view is not clipped by any of its parents, then 9456 * return that area in r in global (root) coordinates. To convert r to local 9457 * coordinates (without taking possible View rotations into account), offset 9458 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9459 * If the view is completely clipped or translated out, return false. 9460 * 9461 * @param r If true is returned, r holds the global coordinates of the 9462 * visible portion of this view. 9463 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9464 * between this view and its root. globalOffet may be null. 9465 * @return true if r is non-empty (i.e. part of the view is visible at the 9466 * root level. 9467 */ 9468 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9469 int width = mRight - mLeft; 9470 int height = mBottom - mTop; 9471 if (width > 0 && height > 0) { 9472 r.set(0, 0, width, height); 9473 if (globalOffset != null) { 9474 globalOffset.set(-mScrollX, -mScrollY); 9475 } 9476 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9477 } 9478 return false; 9479 } 9480 9481 public final boolean getGlobalVisibleRect(Rect r) { 9482 return getGlobalVisibleRect(r, null); 9483 } 9484 9485 public final boolean getLocalVisibleRect(Rect r) { 9486 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9487 if (getGlobalVisibleRect(r, offset)) { 9488 r.offset(-offset.x, -offset.y); // make r local 9489 return true; 9490 } 9491 return false; 9492 } 9493 9494 /** 9495 * Offset this view's vertical location by the specified number of pixels. 9496 * 9497 * @param offset the number of pixels to offset the view by 9498 */ 9499 public void offsetTopAndBottom(int offset) { 9500 if (offset != 0) { 9501 updateMatrix(); 9502 final boolean matrixIsIdentity = mTransformationInfo == null 9503 || mTransformationInfo.mMatrixIsIdentity; 9504 if (matrixIsIdentity) { 9505 if (mDisplayList != null) { 9506 invalidateViewProperty(false, false); 9507 } else { 9508 final ViewParent p = mParent; 9509 if (p != null && mAttachInfo != null) { 9510 final Rect r = mAttachInfo.mTmpInvalRect; 9511 int minTop; 9512 int maxBottom; 9513 int yLoc; 9514 if (offset < 0) { 9515 minTop = mTop + offset; 9516 maxBottom = mBottom; 9517 yLoc = offset; 9518 } else { 9519 minTop = mTop; 9520 maxBottom = mBottom + offset; 9521 yLoc = 0; 9522 } 9523 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9524 p.invalidateChild(this, r); 9525 } 9526 } 9527 } else { 9528 invalidateViewProperty(false, false); 9529 } 9530 9531 mTop += offset; 9532 mBottom += offset; 9533 if (mDisplayList != null) { 9534 mDisplayList.offsetTopBottom(offset); 9535 invalidateViewProperty(false, false); 9536 } else { 9537 if (!matrixIsIdentity) { 9538 invalidateViewProperty(false, true); 9539 } 9540 invalidateParentIfNeeded(); 9541 } 9542 } 9543 } 9544 9545 /** 9546 * Offset this view's horizontal location by the specified amount of pixels. 9547 * 9548 * @param offset the numer of pixels to offset the view by 9549 */ 9550 public void offsetLeftAndRight(int offset) { 9551 if (offset != 0) { 9552 updateMatrix(); 9553 final boolean matrixIsIdentity = mTransformationInfo == null 9554 || mTransformationInfo.mMatrixIsIdentity; 9555 if (matrixIsIdentity) { 9556 if (mDisplayList != null) { 9557 invalidateViewProperty(false, false); 9558 } else { 9559 final ViewParent p = mParent; 9560 if (p != null && mAttachInfo != null) { 9561 final Rect r = mAttachInfo.mTmpInvalRect; 9562 int minLeft; 9563 int maxRight; 9564 if (offset < 0) { 9565 minLeft = mLeft + offset; 9566 maxRight = mRight; 9567 } else { 9568 minLeft = mLeft; 9569 maxRight = mRight + offset; 9570 } 9571 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9572 p.invalidateChild(this, r); 9573 } 9574 } 9575 } else { 9576 invalidateViewProperty(false, false); 9577 } 9578 9579 mLeft += offset; 9580 mRight += offset; 9581 if (mDisplayList != null) { 9582 mDisplayList.offsetLeftRight(offset); 9583 invalidateViewProperty(false, false); 9584 } else { 9585 if (!matrixIsIdentity) { 9586 invalidateViewProperty(false, true); 9587 } 9588 invalidateParentIfNeeded(); 9589 } 9590 } 9591 } 9592 9593 /** 9594 * Get the LayoutParams associated with this view. All views should have 9595 * layout parameters. These supply parameters to the <i>parent</i> of this 9596 * view specifying how it should be arranged. There are many subclasses of 9597 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9598 * of ViewGroup that are responsible for arranging their children. 9599 * 9600 * This method may return null if this View is not attached to a parent 9601 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9602 * was not invoked successfully. When a View is attached to a parent 9603 * ViewGroup, this method must not return null. 9604 * 9605 * @return The LayoutParams associated with this view, or null if no 9606 * parameters have been set yet 9607 */ 9608 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9609 public ViewGroup.LayoutParams getLayoutParams() { 9610 return mLayoutParams; 9611 } 9612 9613 /** 9614 * Set the layout parameters associated with this view. These supply 9615 * parameters to the <i>parent</i> of this view specifying how it should be 9616 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9617 * correspond to the different subclasses of ViewGroup that are responsible 9618 * for arranging their children. 9619 * 9620 * @param params The layout parameters for this view, cannot be null 9621 */ 9622 public void setLayoutParams(ViewGroup.LayoutParams params) { 9623 if (params == null) { 9624 throw new NullPointerException("Layout parameters cannot be null"); 9625 } 9626 mLayoutParams = params; 9627 if (mParent instanceof ViewGroup) { 9628 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9629 } 9630 requestLayout(); 9631 } 9632 9633 /** 9634 * Set the scrolled position of your view. This will cause a call to 9635 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9636 * invalidated. 9637 * @param x the x position to scroll to 9638 * @param y the y position to scroll to 9639 */ 9640 public void scrollTo(int x, int y) { 9641 if (mScrollX != x || mScrollY != y) { 9642 int oldX = mScrollX; 9643 int oldY = mScrollY; 9644 mScrollX = x; 9645 mScrollY = y; 9646 invalidateParentCaches(); 9647 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9648 if (!awakenScrollBars()) { 9649 postInvalidateOnAnimation(); 9650 } 9651 } 9652 } 9653 9654 /** 9655 * Move the scrolled position of your view. This will cause a call to 9656 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9657 * invalidated. 9658 * @param x the amount of pixels to scroll by horizontally 9659 * @param y the amount of pixels to scroll by vertically 9660 */ 9661 public void scrollBy(int x, int y) { 9662 scrollTo(mScrollX + x, mScrollY + y); 9663 } 9664 9665 /** 9666 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9667 * animation to fade the scrollbars out after a default delay. If a subclass 9668 * provides animated scrolling, the start delay should equal the duration 9669 * of the scrolling animation.</p> 9670 * 9671 * <p>The animation starts only if at least one of the scrollbars is 9672 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9673 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9674 * this method returns true, and false otherwise. If the animation is 9675 * started, this method calls {@link #invalidate()}; in that case the 9676 * caller should not call {@link #invalidate()}.</p> 9677 * 9678 * <p>This method should be invoked every time a subclass directly updates 9679 * the scroll parameters.</p> 9680 * 9681 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9682 * and {@link #scrollTo(int, int)}.</p> 9683 * 9684 * @return true if the animation is played, false otherwise 9685 * 9686 * @see #awakenScrollBars(int) 9687 * @see #scrollBy(int, int) 9688 * @see #scrollTo(int, int) 9689 * @see #isHorizontalScrollBarEnabled() 9690 * @see #isVerticalScrollBarEnabled() 9691 * @see #setHorizontalScrollBarEnabled(boolean) 9692 * @see #setVerticalScrollBarEnabled(boolean) 9693 */ 9694 protected boolean awakenScrollBars() { 9695 return mScrollCache != null && 9696 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9697 } 9698 9699 /** 9700 * Trigger the scrollbars to draw. 9701 * This method differs from awakenScrollBars() only in its default duration. 9702 * initialAwakenScrollBars() will show the scroll bars for longer than 9703 * usual to give the user more of a chance to notice them. 9704 * 9705 * @return true if the animation is played, false otherwise. 9706 */ 9707 private boolean initialAwakenScrollBars() { 9708 return mScrollCache != null && 9709 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9710 } 9711 9712 /** 9713 * <p> 9714 * Trigger the scrollbars to draw. When invoked this method starts an 9715 * animation to fade the scrollbars out after a fixed delay. If a subclass 9716 * provides animated scrolling, the start delay should equal the duration of 9717 * the scrolling animation. 9718 * </p> 9719 * 9720 * <p> 9721 * The animation starts only if at least one of the scrollbars is enabled, 9722 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9723 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9724 * this method returns true, and false otherwise. If the animation is 9725 * started, this method calls {@link #invalidate()}; in that case the caller 9726 * should not call {@link #invalidate()}. 9727 * </p> 9728 * 9729 * <p> 9730 * This method should be invoked everytime a subclass directly updates the 9731 * scroll parameters. 9732 * </p> 9733 * 9734 * @param startDelay the delay, in milliseconds, after which the animation 9735 * should start; when the delay is 0, the animation starts 9736 * immediately 9737 * @return true if the animation is played, false otherwise 9738 * 9739 * @see #scrollBy(int, int) 9740 * @see #scrollTo(int, int) 9741 * @see #isHorizontalScrollBarEnabled() 9742 * @see #isVerticalScrollBarEnabled() 9743 * @see #setHorizontalScrollBarEnabled(boolean) 9744 * @see #setVerticalScrollBarEnabled(boolean) 9745 */ 9746 protected boolean awakenScrollBars(int startDelay) { 9747 return awakenScrollBars(startDelay, true); 9748 } 9749 9750 /** 9751 * <p> 9752 * Trigger the scrollbars to draw. When invoked this method starts an 9753 * animation to fade the scrollbars out after a fixed delay. If a subclass 9754 * provides animated scrolling, the start delay should equal the duration of 9755 * the scrolling animation. 9756 * </p> 9757 * 9758 * <p> 9759 * The animation starts only if at least one of the scrollbars is enabled, 9760 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9761 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9762 * this method returns true, and false otherwise. If the animation is 9763 * started, this method calls {@link #invalidate()} if the invalidate parameter 9764 * is set to true; in that case the caller 9765 * should not call {@link #invalidate()}. 9766 * </p> 9767 * 9768 * <p> 9769 * This method should be invoked everytime a subclass directly updates the 9770 * scroll parameters. 9771 * </p> 9772 * 9773 * @param startDelay the delay, in milliseconds, after which the animation 9774 * should start; when the delay is 0, the animation starts 9775 * immediately 9776 * 9777 * @param invalidate Wheter this method should call invalidate 9778 * 9779 * @return true if the animation is played, false otherwise 9780 * 9781 * @see #scrollBy(int, int) 9782 * @see #scrollTo(int, int) 9783 * @see #isHorizontalScrollBarEnabled() 9784 * @see #isVerticalScrollBarEnabled() 9785 * @see #setHorizontalScrollBarEnabled(boolean) 9786 * @see #setVerticalScrollBarEnabled(boolean) 9787 */ 9788 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9789 final ScrollabilityCache scrollCache = mScrollCache; 9790 9791 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9792 return false; 9793 } 9794 9795 if (scrollCache.scrollBar == null) { 9796 scrollCache.scrollBar = new ScrollBarDrawable(); 9797 } 9798 9799 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9800 9801 if (invalidate) { 9802 // Invalidate to show the scrollbars 9803 postInvalidateOnAnimation(); 9804 } 9805 9806 if (scrollCache.state == ScrollabilityCache.OFF) { 9807 // FIXME: this is copied from WindowManagerService. 9808 // We should get this value from the system when it 9809 // is possible to do so. 9810 final int KEY_REPEAT_FIRST_DELAY = 750; 9811 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9812 } 9813 9814 // Tell mScrollCache when we should start fading. This may 9815 // extend the fade start time if one was already scheduled 9816 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9817 scrollCache.fadeStartTime = fadeStartTime; 9818 scrollCache.state = ScrollabilityCache.ON; 9819 9820 // Schedule our fader to run, unscheduling any old ones first 9821 if (mAttachInfo != null) { 9822 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9823 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9824 } 9825 9826 return true; 9827 } 9828 9829 return false; 9830 } 9831 9832 /** 9833 * Do not invalidate views which are not visible and which are not running an animation. They 9834 * will not get drawn and they should not set dirty flags as if they will be drawn 9835 */ 9836 private boolean skipInvalidate() { 9837 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9838 (!(mParent instanceof ViewGroup) || 9839 !((ViewGroup) mParent).isViewTransitioning(this)); 9840 } 9841 /** 9842 * Mark the area defined by dirty as needing to be drawn. If the view is 9843 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9844 * in the future. This must be called from a UI thread. To call from a non-UI 9845 * thread, call {@link #postInvalidate()}. 9846 * 9847 * WARNING: This method is destructive to dirty. 9848 * @param dirty the rectangle representing the bounds of the dirty region 9849 */ 9850 public void invalidate(Rect dirty) { 9851 if (ViewDebug.TRACE_HIERARCHY) { 9852 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9853 } 9854 9855 if (skipInvalidate()) { 9856 return; 9857 } 9858 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9859 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9860 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9861 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9862 mPrivateFlags |= INVALIDATED; 9863 mPrivateFlags |= DIRTY; 9864 final ViewParent p = mParent; 9865 final AttachInfo ai = mAttachInfo; 9866 //noinspection PointlessBooleanExpression,ConstantConditions 9867 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9868 if (p != null && ai != null && ai.mHardwareAccelerated) { 9869 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9870 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9871 p.invalidateChild(this, null); 9872 return; 9873 } 9874 } 9875 if (p != null && ai != null) { 9876 final int scrollX = mScrollX; 9877 final int scrollY = mScrollY; 9878 final Rect r = ai.mTmpInvalRect; 9879 r.set(dirty.left - scrollX, dirty.top - scrollY, 9880 dirty.right - scrollX, dirty.bottom - scrollY); 9881 mParent.invalidateChild(this, r); 9882 } 9883 } 9884 } 9885 9886 /** 9887 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9888 * The coordinates of the dirty rect are relative to the view. 9889 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9890 * will be called at some point in the future. This must be called from 9891 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9892 * @param l the left position of the dirty region 9893 * @param t the top position of the dirty region 9894 * @param r the right position of the dirty region 9895 * @param b the bottom position of the dirty region 9896 */ 9897 public void invalidate(int l, int t, int r, int b) { 9898 if (ViewDebug.TRACE_HIERARCHY) { 9899 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9900 } 9901 9902 if (skipInvalidate()) { 9903 return; 9904 } 9905 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9906 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9907 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9908 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9909 mPrivateFlags |= INVALIDATED; 9910 mPrivateFlags |= DIRTY; 9911 final ViewParent p = mParent; 9912 final AttachInfo ai = mAttachInfo; 9913 //noinspection PointlessBooleanExpression,ConstantConditions 9914 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9915 if (p != null && ai != null && ai.mHardwareAccelerated) { 9916 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9917 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9918 p.invalidateChild(this, null); 9919 return; 9920 } 9921 } 9922 if (p != null && ai != null && l < r && t < b) { 9923 final int scrollX = mScrollX; 9924 final int scrollY = mScrollY; 9925 final Rect tmpr = ai.mTmpInvalRect; 9926 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9927 p.invalidateChild(this, tmpr); 9928 } 9929 } 9930 } 9931 9932 /** 9933 * Invalidate the whole view. If the view is visible, 9934 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9935 * the future. This must be called from a UI thread. To call from a non-UI thread, 9936 * call {@link #postInvalidate()}. 9937 */ 9938 public void invalidate() { 9939 invalidate(true); 9940 } 9941 9942 /** 9943 * This is where the invalidate() work actually happens. A full invalidate() 9944 * causes the drawing cache to be invalidated, but this function can be called with 9945 * invalidateCache set to false to skip that invalidation step for cases that do not 9946 * need it (for example, a component that remains at the same dimensions with the same 9947 * content). 9948 * 9949 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9950 * well. This is usually true for a full invalidate, but may be set to false if the 9951 * View's contents or dimensions have not changed. 9952 */ 9953 void invalidate(boolean invalidateCache) { 9954 if (ViewDebug.TRACE_HIERARCHY) { 9955 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9956 } 9957 9958 if (skipInvalidate()) { 9959 return; 9960 } 9961 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9962 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9963 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9964 mLastIsOpaque = isOpaque(); 9965 mPrivateFlags &= ~DRAWN; 9966 mPrivateFlags |= DIRTY; 9967 if (invalidateCache) { 9968 mPrivateFlags |= INVALIDATED; 9969 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9970 } 9971 final AttachInfo ai = mAttachInfo; 9972 final ViewParent p = mParent; 9973 //noinspection PointlessBooleanExpression,ConstantConditions 9974 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9975 if (p != null && ai != null && ai.mHardwareAccelerated) { 9976 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9977 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9978 p.invalidateChild(this, null); 9979 return; 9980 } 9981 } 9982 9983 if (p != null && ai != null) { 9984 final Rect r = ai.mTmpInvalRect; 9985 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9986 // Don't call invalidate -- we don't want to internally scroll 9987 // our own bounds 9988 p.invalidateChild(this, r); 9989 } 9990 } 9991 } 9992 9993 /** 9994 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9995 * set any flags or handle all of the cases handled by the default invalidation methods. 9996 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9997 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9998 * walk up the hierarchy, transforming the dirty rect as necessary. 9999 * 10000 * The method also handles normal invalidation logic if display list properties are not 10001 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10002 * backup approach, to handle these cases used in the various property-setting methods. 10003 * 10004 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10005 * are not being used in this view 10006 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10007 * list properties are not being used in this view 10008 */ 10009 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10010 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10011 if (invalidateParent) { 10012 invalidateParentCaches(); 10013 } 10014 if (forceRedraw) { 10015 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10016 } 10017 invalidate(false); 10018 } else { 10019 final AttachInfo ai = mAttachInfo; 10020 final ViewParent p = mParent; 10021 if (p != null && ai != null) { 10022 final Rect r = ai.mTmpInvalRect; 10023 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10024 if (mParent instanceof ViewGroup) { 10025 ((ViewGroup) mParent).invalidateChildFast(this, r); 10026 } else { 10027 mParent.invalidateChild(this, r); 10028 } 10029 } 10030 } 10031 } 10032 10033 /** 10034 * Utility method to transform a given Rect by the current matrix of this view. 10035 */ 10036 void transformRect(final Rect rect) { 10037 if (!getMatrix().isIdentity()) { 10038 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10039 boundingRect.set(rect); 10040 getMatrix().mapRect(boundingRect); 10041 rect.set((int) (boundingRect.left - 0.5f), 10042 (int) (boundingRect.top - 0.5f), 10043 (int) (boundingRect.right + 0.5f), 10044 (int) (boundingRect.bottom + 0.5f)); 10045 } 10046 } 10047 10048 /** 10049 * Used to indicate that the parent of this view should clear its caches. This functionality 10050 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10051 * which is necessary when various parent-managed properties of the view change, such as 10052 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10053 * clears the parent caches and does not causes an invalidate event. 10054 * 10055 * @hide 10056 */ 10057 protected void invalidateParentCaches() { 10058 if (mParent instanceof View) { 10059 ((View) mParent).mPrivateFlags |= INVALIDATED; 10060 } 10061 } 10062 10063 /** 10064 * Used to indicate that the parent of this view should be invalidated. This functionality 10065 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10066 * which is necessary when various parent-managed properties of the view change, such as 10067 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10068 * an invalidation event to the parent. 10069 * 10070 * @hide 10071 */ 10072 protected void invalidateParentIfNeeded() { 10073 if (isHardwareAccelerated() && mParent instanceof View) { 10074 ((View) mParent).invalidate(true); 10075 } 10076 } 10077 10078 /** 10079 * Indicates whether this View is opaque. An opaque View guarantees that it will 10080 * draw all the pixels overlapping its bounds using a fully opaque color. 10081 * 10082 * Subclasses of View should override this method whenever possible to indicate 10083 * whether an instance is opaque. Opaque Views are treated in a special way by 10084 * the View hierarchy, possibly allowing it to perform optimizations during 10085 * invalidate/draw passes. 10086 * 10087 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10088 */ 10089 @ViewDebug.ExportedProperty(category = "drawing") 10090 public boolean isOpaque() { 10091 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10092 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10093 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10094 } 10095 10096 /** 10097 * @hide 10098 */ 10099 protected void computeOpaqueFlags() { 10100 // Opaque if: 10101 // - Has a background 10102 // - Background is opaque 10103 // - Doesn't have scrollbars or scrollbars are inside overlay 10104 10105 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10106 mPrivateFlags |= OPAQUE_BACKGROUND; 10107 } else { 10108 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10109 } 10110 10111 final int flags = mViewFlags; 10112 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10113 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10114 mPrivateFlags |= OPAQUE_SCROLLBARS; 10115 } else { 10116 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10117 } 10118 } 10119 10120 /** 10121 * @hide 10122 */ 10123 protected boolean hasOpaqueScrollbars() { 10124 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10125 } 10126 10127 /** 10128 * @return A handler associated with the thread running the View. This 10129 * handler can be used to pump events in the UI events queue. 10130 */ 10131 public Handler getHandler() { 10132 if (mAttachInfo != null) { 10133 return mAttachInfo.mHandler; 10134 } 10135 return null; 10136 } 10137 10138 /** 10139 * Gets the view root associated with the View. 10140 * @return The view root, or null if none. 10141 * @hide 10142 */ 10143 public ViewRootImpl getViewRootImpl() { 10144 if (mAttachInfo != null) { 10145 return mAttachInfo.mViewRootImpl; 10146 } 10147 return null; 10148 } 10149 10150 /** 10151 * <p>Causes the Runnable to be added to the message queue. 10152 * The runnable will be run on the user interface thread.</p> 10153 * 10154 * <p>This method can be invoked from outside of the UI thread 10155 * only when this View is attached to a window.</p> 10156 * 10157 * @param action The Runnable that will be executed. 10158 * 10159 * @return Returns true if the Runnable was successfully placed in to the 10160 * message queue. Returns false on failure, usually because the 10161 * looper processing the message queue is exiting. 10162 * 10163 * @see #postDelayed 10164 * @see #removeCallbacks 10165 */ 10166 public boolean post(Runnable action) { 10167 final AttachInfo attachInfo = mAttachInfo; 10168 if (attachInfo != null) { 10169 return attachInfo.mHandler.post(action); 10170 } 10171 // Assume that post will succeed later 10172 ViewRootImpl.getRunQueue().post(action); 10173 return true; 10174 } 10175 10176 /** 10177 * <p>Causes the Runnable to be added to the message queue, to be run 10178 * after the specified amount of time elapses. 10179 * The runnable will be run on the user interface thread.</p> 10180 * 10181 * <p>This method can be invoked from outside of the UI thread 10182 * only when this View is attached to a window.</p> 10183 * 10184 * @param action The Runnable that will be executed. 10185 * @param delayMillis The delay (in milliseconds) until the Runnable 10186 * will be executed. 10187 * 10188 * @return true if the Runnable was successfully placed in to the 10189 * message queue. Returns false on failure, usually because the 10190 * looper processing the message queue is exiting. Note that a 10191 * result of true does not mean the Runnable will be processed -- 10192 * if the looper is quit before the delivery time of the message 10193 * occurs then the message will be dropped. 10194 * 10195 * @see #post 10196 * @see #removeCallbacks 10197 */ 10198 public boolean postDelayed(Runnable action, long delayMillis) { 10199 final AttachInfo attachInfo = mAttachInfo; 10200 if (attachInfo != null) { 10201 return attachInfo.mHandler.postDelayed(action, delayMillis); 10202 } 10203 // Assume that post will succeed later 10204 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10205 return true; 10206 } 10207 10208 /** 10209 * <p>Causes the Runnable to execute on the next animation time step. 10210 * The runnable will be run on the user interface thread.</p> 10211 * 10212 * <p>This method can be invoked from outside of the UI thread 10213 * only when this View is attached to a window.</p> 10214 * 10215 * @param action The Runnable that will be executed. 10216 * 10217 * @see #postOnAnimationDelayed 10218 * @see #removeCallbacks 10219 */ 10220 public void postOnAnimation(Runnable action) { 10221 final AttachInfo attachInfo = mAttachInfo; 10222 if (attachInfo != null) { 10223 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10224 Choreographer.CALLBACK_ANIMATION, action, null); 10225 } else { 10226 // Assume that post will succeed later 10227 ViewRootImpl.getRunQueue().post(action); 10228 } 10229 } 10230 10231 /** 10232 * <p>Causes the Runnable to execute on the next animation time step, 10233 * after the specified amount of time elapses. 10234 * The runnable will be run on the user interface thread.</p> 10235 * 10236 * <p>This method can be invoked from outside of the UI thread 10237 * only when this View is attached to a window.</p> 10238 * 10239 * @param action The Runnable that will be executed. 10240 * @param delayMillis The delay (in milliseconds) until the Runnable 10241 * will be executed. 10242 * 10243 * @see #postOnAnimation 10244 * @see #removeCallbacks 10245 */ 10246 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10247 final AttachInfo attachInfo = mAttachInfo; 10248 if (attachInfo != null) { 10249 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10250 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10251 } else { 10252 // Assume that post will succeed later 10253 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10254 } 10255 } 10256 10257 /** 10258 * <p>Removes the specified Runnable from the message queue.</p> 10259 * 10260 * <p>This method can be invoked from outside of the UI thread 10261 * only when this View is attached to a window.</p> 10262 * 10263 * @param action The Runnable to remove from the message handling queue 10264 * 10265 * @return true if this view could ask the Handler to remove the Runnable, 10266 * false otherwise. When the returned value is true, the Runnable 10267 * may or may not have been actually removed from the message queue 10268 * (for instance, if the Runnable was not in the queue already.) 10269 * 10270 * @see #post 10271 * @see #postDelayed 10272 * @see #postOnAnimation 10273 * @see #postOnAnimationDelayed 10274 */ 10275 public boolean removeCallbacks(Runnable action) { 10276 if (action != null) { 10277 final AttachInfo attachInfo = mAttachInfo; 10278 if (attachInfo != null) { 10279 attachInfo.mHandler.removeCallbacks(action); 10280 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10281 Choreographer.CALLBACK_ANIMATION, action, null); 10282 } else { 10283 // Assume that post will succeed later 10284 ViewRootImpl.getRunQueue().removeCallbacks(action); 10285 } 10286 } 10287 return true; 10288 } 10289 10290 /** 10291 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10292 * Use this to invalidate the View from a non-UI thread.</p> 10293 * 10294 * <p>This method can be invoked from outside of the UI thread 10295 * only when this View is attached to a window.</p> 10296 * 10297 * @see #invalidate() 10298 * @see #postInvalidateDelayed(long) 10299 */ 10300 public void postInvalidate() { 10301 postInvalidateDelayed(0); 10302 } 10303 10304 /** 10305 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10306 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10307 * 10308 * <p>This method can be invoked from outside of the UI thread 10309 * only when this View is attached to a window.</p> 10310 * 10311 * @param left The left coordinate of the rectangle to invalidate. 10312 * @param top The top coordinate of the rectangle to invalidate. 10313 * @param right The right coordinate of the rectangle to invalidate. 10314 * @param bottom The bottom coordinate of the rectangle to invalidate. 10315 * 10316 * @see #invalidate(int, int, int, int) 10317 * @see #invalidate(Rect) 10318 * @see #postInvalidateDelayed(long, int, int, int, int) 10319 */ 10320 public void postInvalidate(int left, int top, int right, int bottom) { 10321 postInvalidateDelayed(0, left, top, right, bottom); 10322 } 10323 10324 /** 10325 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10326 * loop. Waits for the specified amount of time.</p> 10327 * 10328 * <p>This method can be invoked from outside of the UI thread 10329 * only when this View is attached to a window.</p> 10330 * 10331 * @param delayMilliseconds the duration in milliseconds to delay the 10332 * invalidation by 10333 * 10334 * @see #invalidate() 10335 * @see #postInvalidate() 10336 */ 10337 public void postInvalidateDelayed(long delayMilliseconds) { 10338 // We try only with the AttachInfo because there's no point in invalidating 10339 // if we are not attached to our window 10340 final AttachInfo attachInfo = mAttachInfo; 10341 if (attachInfo != null) { 10342 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10343 } 10344 } 10345 10346 /** 10347 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10348 * through the event 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 * @param left The left coordinate of the rectangle to invalidate. 10356 * @param top The top coordinate of the rectangle to invalidate. 10357 * @param right The right coordinate of the rectangle to invalidate. 10358 * @param bottom The bottom coordinate of the rectangle to invalidate. 10359 * 10360 * @see #invalidate(int, int, int, int) 10361 * @see #invalidate(Rect) 10362 * @see #postInvalidate(int, int, int, int) 10363 */ 10364 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10365 int right, int bottom) { 10366 10367 // We try only with the AttachInfo because there's no point in invalidating 10368 // if we are not attached to our window 10369 final AttachInfo attachInfo = mAttachInfo; 10370 if (attachInfo != null) { 10371 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10372 info.target = this; 10373 info.left = left; 10374 info.top = top; 10375 info.right = right; 10376 info.bottom = bottom; 10377 10378 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10379 } 10380 } 10381 10382 /** 10383 * <p>Cause an invalidate to happen on the next animation time step, typically the 10384 * next display frame.</p> 10385 * 10386 * <p>This method can be invoked from outside of the UI thread 10387 * only when this View is attached to a window.</p> 10388 * 10389 * @see #invalidate() 10390 */ 10391 public void postInvalidateOnAnimation() { 10392 // We try only with the AttachInfo because there's no point in invalidating 10393 // if we are not attached to our window 10394 final AttachInfo attachInfo = mAttachInfo; 10395 if (attachInfo != null) { 10396 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10397 } 10398 } 10399 10400 /** 10401 * <p>Cause an invalidate of the specified area to happen on the next animation 10402 * time step, typically the next display frame.</p> 10403 * 10404 * <p>This method can be invoked from outside of the UI thread 10405 * only when this View is attached to a window.</p> 10406 * 10407 * @param left The left coordinate of the rectangle to invalidate. 10408 * @param top The top coordinate of the rectangle to invalidate. 10409 * @param right The right coordinate of the rectangle to invalidate. 10410 * @param bottom The bottom coordinate of the rectangle to invalidate. 10411 * 10412 * @see #invalidate(int, int, int, int) 10413 * @see #invalidate(Rect) 10414 */ 10415 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10416 // We try only with the AttachInfo because there's no point in invalidating 10417 // if we are not attached to our window 10418 final AttachInfo attachInfo = mAttachInfo; 10419 if (attachInfo != null) { 10420 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10421 info.target = this; 10422 info.left = left; 10423 info.top = top; 10424 info.right = right; 10425 info.bottom = bottom; 10426 10427 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10428 } 10429 } 10430 10431 /** 10432 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10433 * This event is sent at most once every 10434 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10435 */ 10436 private void postSendViewScrolledAccessibilityEventCallback() { 10437 if (mSendViewScrolledAccessibilityEvent == null) { 10438 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10439 } 10440 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10441 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10442 postDelayed(mSendViewScrolledAccessibilityEvent, 10443 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10444 } 10445 } 10446 10447 /** 10448 * Called by a parent to request that a child update its values for mScrollX 10449 * and mScrollY if necessary. This will typically be done if the child is 10450 * animating a scroll using a {@link android.widget.Scroller Scroller} 10451 * object. 10452 */ 10453 public void computeScroll() { 10454 } 10455 10456 /** 10457 * <p>Indicate whether the horizontal edges are faded when the view is 10458 * scrolled horizontally.</p> 10459 * 10460 * @return true if the horizontal edges should are faded on scroll, false 10461 * otherwise 10462 * 10463 * @see #setHorizontalFadingEdgeEnabled(boolean) 10464 * 10465 * @attr ref android.R.styleable#View_requiresFadingEdge 10466 */ 10467 public boolean isHorizontalFadingEdgeEnabled() { 10468 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10469 } 10470 10471 /** 10472 * <p>Define whether the horizontal edges should be faded when this view 10473 * is scrolled horizontally.</p> 10474 * 10475 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10476 * be faded when the view is scrolled 10477 * horizontally 10478 * 10479 * @see #isHorizontalFadingEdgeEnabled() 10480 * 10481 * @attr ref android.R.styleable#View_requiresFadingEdge 10482 */ 10483 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10484 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10485 if (horizontalFadingEdgeEnabled) { 10486 initScrollCache(); 10487 } 10488 10489 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10490 } 10491 } 10492 10493 /** 10494 * <p>Indicate whether the vertical edges are faded when the view is 10495 * scrolled horizontally.</p> 10496 * 10497 * @return true if the vertical edges should are faded on scroll, false 10498 * otherwise 10499 * 10500 * @see #setVerticalFadingEdgeEnabled(boolean) 10501 * 10502 * @attr ref android.R.styleable#View_requiresFadingEdge 10503 */ 10504 public boolean isVerticalFadingEdgeEnabled() { 10505 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10506 } 10507 10508 /** 10509 * <p>Define whether the vertical edges should be faded when this view 10510 * is scrolled vertically.</p> 10511 * 10512 * @param verticalFadingEdgeEnabled true if the vertical edges should 10513 * be faded when the view is scrolled 10514 * vertically 10515 * 10516 * @see #isVerticalFadingEdgeEnabled() 10517 * 10518 * @attr ref android.R.styleable#View_requiresFadingEdge 10519 */ 10520 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10521 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10522 if (verticalFadingEdgeEnabled) { 10523 initScrollCache(); 10524 } 10525 10526 mViewFlags ^= FADING_EDGE_VERTICAL; 10527 } 10528 } 10529 10530 /** 10531 * Returns the strength, or intensity, of the top faded edge. The strength is 10532 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10533 * returns 0.0 or 1.0 but no value in between. 10534 * 10535 * Subclasses should override this method to provide a smoother fade transition 10536 * when scrolling occurs. 10537 * 10538 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10539 */ 10540 protected float getTopFadingEdgeStrength() { 10541 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10542 } 10543 10544 /** 10545 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10546 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10547 * returns 0.0 or 1.0 but no value in between. 10548 * 10549 * Subclasses should override this method to provide a smoother fade transition 10550 * when scrolling occurs. 10551 * 10552 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10553 */ 10554 protected float getBottomFadingEdgeStrength() { 10555 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10556 computeVerticalScrollRange() ? 1.0f : 0.0f; 10557 } 10558 10559 /** 10560 * Returns the strength, or intensity, of the left faded edge. The strength is 10561 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10562 * returns 0.0 or 1.0 but no value in between. 10563 * 10564 * Subclasses should override this method to provide a smoother fade transition 10565 * when scrolling occurs. 10566 * 10567 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10568 */ 10569 protected float getLeftFadingEdgeStrength() { 10570 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10571 } 10572 10573 /** 10574 * Returns the strength, or intensity, of the right faded edge. The strength is 10575 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10576 * returns 0.0 or 1.0 but no value in between. 10577 * 10578 * Subclasses should override this method to provide a smoother fade transition 10579 * when scrolling occurs. 10580 * 10581 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10582 */ 10583 protected float getRightFadingEdgeStrength() { 10584 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10585 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10586 } 10587 10588 /** 10589 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10590 * scrollbar is not drawn by default.</p> 10591 * 10592 * @return true if the horizontal scrollbar should be painted, false 10593 * otherwise 10594 * 10595 * @see #setHorizontalScrollBarEnabled(boolean) 10596 */ 10597 public boolean isHorizontalScrollBarEnabled() { 10598 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10599 } 10600 10601 /** 10602 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10603 * scrollbar is not drawn by default.</p> 10604 * 10605 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10606 * be painted 10607 * 10608 * @see #isHorizontalScrollBarEnabled() 10609 */ 10610 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10611 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10612 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10613 computeOpaqueFlags(); 10614 resolvePadding(); 10615 } 10616 } 10617 10618 /** 10619 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10620 * scrollbar is not drawn by default.</p> 10621 * 10622 * @return true if the vertical scrollbar should be painted, false 10623 * otherwise 10624 * 10625 * @see #setVerticalScrollBarEnabled(boolean) 10626 */ 10627 public boolean isVerticalScrollBarEnabled() { 10628 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10629 } 10630 10631 /** 10632 * <p>Define whether the vertical scrollbar should be drawn or not. The 10633 * scrollbar is not drawn by default.</p> 10634 * 10635 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10636 * be painted 10637 * 10638 * @see #isVerticalScrollBarEnabled() 10639 */ 10640 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10641 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10642 mViewFlags ^= SCROLLBARS_VERTICAL; 10643 computeOpaqueFlags(); 10644 resolvePadding(); 10645 } 10646 } 10647 10648 /** 10649 * @hide 10650 */ 10651 protected void recomputePadding() { 10652 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10653 } 10654 10655 /** 10656 * Define whether scrollbars will fade when the view is not scrolling. 10657 * 10658 * @param fadeScrollbars wheter to enable fading 10659 * 10660 * @attr ref android.R.styleable#View_fadeScrollbars 10661 */ 10662 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10663 initScrollCache(); 10664 final ScrollabilityCache scrollabilityCache = mScrollCache; 10665 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10666 if (fadeScrollbars) { 10667 scrollabilityCache.state = ScrollabilityCache.OFF; 10668 } else { 10669 scrollabilityCache.state = ScrollabilityCache.ON; 10670 } 10671 } 10672 10673 /** 10674 * 10675 * Returns true if scrollbars will fade when this view is not scrolling 10676 * 10677 * @return true if scrollbar fading is enabled 10678 * 10679 * @attr ref android.R.styleable#View_fadeScrollbars 10680 */ 10681 public boolean isScrollbarFadingEnabled() { 10682 return mScrollCache != null && mScrollCache.fadeScrollBars; 10683 } 10684 10685 /** 10686 * 10687 * Returns the delay before scrollbars fade. 10688 * 10689 * @return the delay before scrollbars fade 10690 * 10691 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10692 */ 10693 public int getScrollBarDefaultDelayBeforeFade() { 10694 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10695 mScrollCache.scrollBarDefaultDelayBeforeFade; 10696 } 10697 10698 /** 10699 * Define the delay before scrollbars fade. 10700 * 10701 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10702 * 10703 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10704 */ 10705 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10706 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10707 } 10708 10709 /** 10710 * 10711 * Returns the scrollbar fade duration. 10712 * 10713 * @return the scrollbar fade duration 10714 * 10715 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10716 */ 10717 public int getScrollBarFadeDuration() { 10718 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10719 mScrollCache.scrollBarFadeDuration; 10720 } 10721 10722 /** 10723 * Define the scrollbar fade duration. 10724 * 10725 * @param scrollBarFadeDuration - the scrollbar fade duration 10726 * 10727 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10728 */ 10729 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10730 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10731 } 10732 10733 /** 10734 * 10735 * Returns the scrollbar size. 10736 * 10737 * @return the scrollbar size 10738 * 10739 * @attr ref android.R.styleable#View_scrollbarSize 10740 */ 10741 public int getScrollBarSize() { 10742 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10743 mScrollCache.scrollBarSize; 10744 } 10745 10746 /** 10747 * Define the scrollbar size. 10748 * 10749 * @param scrollBarSize - the scrollbar size 10750 * 10751 * @attr ref android.R.styleable#View_scrollbarSize 10752 */ 10753 public void setScrollBarSize(int scrollBarSize) { 10754 getScrollCache().scrollBarSize = scrollBarSize; 10755 } 10756 10757 /** 10758 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10759 * inset. When inset, they add to the padding of the view. And the scrollbars 10760 * can be drawn inside the padding area or on the edge of the view. For example, 10761 * if a view has a background drawable and you want to draw the scrollbars 10762 * inside the padding specified by the drawable, you can use 10763 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10764 * appear at the edge of the view, ignoring the padding, then you can use 10765 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10766 * @param style the style of the scrollbars. Should be one of 10767 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10768 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10769 * @see #SCROLLBARS_INSIDE_OVERLAY 10770 * @see #SCROLLBARS_INSIDE_INSET 10771 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10772 * @see #SCROLLBARS_OUTSIDE_INSET 10773 * 10774 * @attr ref android.R.styleable#View_scrollbarStyle 10775 */ 10776 public void setScrollBarStyle(int style) { 10777 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10778 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10779 computeOpaqueFlags(); 10780 resolvePadding(); 10781 } 10782 } 10783 10784 /** 10785 * <p>Returns the current scrollbar style.</p> 10786 * @return the current scrollbar style 10787 * @see #SCROLLBARS_INSIDE_OVERLAY 10788 * @see #SCROLLBARS_INSIDE_INSET 10789 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10790 * @see #SCROLLBARS_OUTSIDE_INSET 10791 * 10792 * @attr ref android.R.styleable#View_scrollbarStyle 10793 */ 10794 @ViewDebug.ExportedProperty(mapping = { 10795 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10796 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10797 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10798 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10799 }) 10800 public int getScrollBarStyle() { 10801 return mViewFlags & SCROLLBARS_STYLE_MASK; 10802 } 10803 10804 /** 10805 * <p>Compute the horizontal range that the horizontal scrollbar 10806 * represents.</p> 10807 * 10808 * <p>The range is expressed in arbitrary units that must be the same as the 10809 * units used by {@link #computeHorizontalScrollExtent()} and 10810 * {@link #computeHorizontalScrollOffset()}.</p> 10811 * 10812 * <p>The default range is the drawing width of this view.</p> 10813 * 10814 * @return the total horizontal range represented by the horizontal 10815 * scrollbar 10816 * 10817 * @see #computeHorizontalScrollExtent() 10818 * @see #computeHorizontalScrollOffset() 10819 * @see android.widget.ScrollBarDrawable 10820 */ 10821 protected int computeHorizontalScrollRange() { 10822 return getWidth(); 10823 } 10824 10825 /** 10826 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10827 * within the horizontal range. This value is used to compute the position 10828 * of the thumb within the scrollbar's track.</p> 10829 * 10830 * <p>The range is expressed in arbitrary units that must be the same as the 10831 * units used by {@link #computeHorizontalScrollRange()} and 10832 * {@link #computeHorizontalScrollExtent()}.</p> 10833 * 10834 * <p>The default offset is the scroll offset of this view.</p> 10835 * 10836 * @return the horizontal offset of the scrollbar's thumb 10837 * 10838 * @see #computeHorizontalScrollRange() 10839 * @see #computeHorizontalScrollExtent() 10840 * @see android.widget.ScrollBarDrawable 10841 */ 10842 protected int computeHorizontalScrollOffset() { 10843 return mScrollX; 10844 } 10845 10846 /** 10847 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10848 * within the horizontal range. This value is used to compute the length 10849 * of the thumb within the scrollbar's track.</p> 10850 * 10851 * <p>The range is expressed in arbitrary units that must be the same as the 10852 * units used by {@link #computeHorizontalScrollRange()} and 10853 * {@link #computeHorizontalScrollOffset()}.</p> 10854 * 10855 * <p>The default extent is the drawing width of this view.</p> 10856 * 10857 * @return the horizontal extent of the scrollbar's thumb 10858 * 10859 * @see #computeHorizontalScrollRange() 10860 * @see #computeHorizontalScrollOffset() 10861 * @see android.widget.ScrollBarDrawable 10862 */ 10863 protected int computeHorizontalScrollExtent() { 10864 return getWidth(); 10865 } 10866 10867 /** 10868 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10869 * 10870 * <p>The range is expressed in arbitrary units that must be the same as the 10871 * units used by {@link #computeVerticalScrollExtent()} and 10872 * {@link #computeVerticalScrollOffset()}.</p> 10873 * 10874 * @return the total vertical range represented by the vertical scrollbar 10875 * 10876 * <p>The default range is the drawing height of this view.</p> 10877 * 10878 * @see #computeVerticalScrollExtent() 10879 * @see #computeVerticalScrollOffset() 10880 * @see android.widget.ScrollBarDrawable 10881 */ 10882 protected int computeVerticalScrollRange() { 10883 return getHeight(); 10884 } 10885 10886 /** 10887 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10888 * within the horizontal range. This value is used to compute the position 10889 * of the thumb within the scrollbar's track.</p> 10890 * 10891 * <p>The range is expressed in arbitrary units that must be the same as the 10892 * units used by {@link #computeVerticalScrollRange()} and 10893 * {@link #computeVerticalScrollExtent()}.</p> 10894 * 10895 * <p>The default offset is the scroll offset of this view.</p> 10896 * 10897 * @return the vertical offset of the scrollbar's thumb 10898 * 10899 * @see #computeVerticalScrollRange() 10900 * @see #computeVerticalScrollExtent() 10901 * @see android.widget.ScrollBarDrawable 10902 */ 10903 protected int computeVerticalScrollOffset() { 10904 return mScrollY; 10905 } 10906 10907 /** 10908 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10909 * within the vertical range. This value is used to compute the length 10910 * of the thumb within the scrollbar's track.</p> 10911 * 10912 * <p>The range is expressed in arbitrary units that must be the same as the 10913 * units used by {@link #computeVerticalScrollRange()} and 10914 * {@link #computeVerticalScrollOffset()}.</p> 10915 * 10916 * <p>The default extent is the drawing height of this view.</p> 10917 * 10918 * @return the vertical extent of the scrollbar's thumb 10919 * 10920 * @see #computeVerticalScrollRange() 10921 * @see #computeVerticalScrollOffset() 10922 * @see android.widget.ScrollBarDrawable 10923 */ 10924 protected int computeVerticalScrollExtent() { 10925 return getHeight(); 10926 } 10927 10928 /** 10929 * Check if this view can be scrolled horizontally in a certain direction. 10930 * 10931 * @param direction Negative to check scrolling left, positive to check scrolling right. 10932 * @return true if this view can be scrolled in the specified direction, false otherwise. 10933 */ 10934 public boolean canScrollHorizontally(int direction) { 10935 final int offset = computeHorizontalScrollOffset(); 10936 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10937 if (range == 0) return false; 10938 if (direction < 0) { 10939 return offset > 0; 10940 } else { 10941 return offset < range - 1; 10942 } 10943 } 10944 10945 /** 10946 * Check if this view can be scrolled vertically in a certain direction. 10947 * 10948 * @param direction Negative to check scrolling up, positive to check scrolling down. 10949 * @return true if this view can be scrolled in the specified direction, false otherwise. 10950 */ 10951 public boolean canScrollVertically(int direction) { 10952 final int offset = computeVerticalScrollOffset(); 10953 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10954 if (range == 0) return false; 10955 if (direction < 0) { 10956 return offset > 0; 10957 } else { 10958 return offset < range - 1; 10959 } 10960 } 10961 10962 /** 10963 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10964 * scrollbars are painted only if they have been awakened first.</p> 10965 * 10966 * @param canvas the canvas on which to draw the scrollbars 10967 * 10968 * @see #awakenScrollBars(int) 10969 */ 10970 protected final void onDrawScrollBars(Canvas canvas) { 10971 // scrollbars are drawn only when the animation is running 10972 final ScrollabilityCache cache = mScrollCache; 10973 if (cache != null) { 10974 10975 int state = cache.state; 10976 10977 if (state == ScrollabilityCache.OFF) { 10978 return; 10979 } 10980 10981 boolean invalidate = false; 10982 10983 if (state == ScrollabilityCache.FADING) { 10984 // We're fading -- get our fade interpolation 10985 if (cache.interpolatorValues == null) { 10986 cache.interpolatorValues = new float[1]; 10987 } 10988 10989 float[] values = cache.interpolatorValues; 10990 10991 // Stops the animation if we're done 10992 if (cache.scrollBarInterpolator.timeToValues(values) == 10993 Interpolator.Result.FREEZE_END) { 10994 cache.state = ScrollabilityCache.OFF; 10995 } else { 10996 cache.scrollBar.setAlpha(Math.round(values[0])); 10997 } 10998 10999 // This will make the scroll bars inval themselves after 11000 // drawing. We only want this when we're fading so that 11001 // we prevent excessive redraws 11002 invalidate = true; 11003 } else { 11004 // We're just on -- but we may have been fading before so 11005 // reset alpha 11006 cache.scrollBar.setAlpha(255); 11007 } 11008 11009 11010 final int viewFlags = mViewFlags; 11011 11012 final boolean drawHorizontalScrollBar = 11013 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11014 final boolean drawVerticalScrollBar = 11015 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11016 && !isVerticalScrollBarHidden(); 11017 11018 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11019 final int width = mRight - mLeft; 11020 final int height = mBottom - mTop; 11021 11022 final ScrollBarDrawable scrollBar = cache.scrollBar; 11023 11024 final int scrollX = mScrollX; 11025 final int scrollY = mScrollY; 11026 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11027 11028 int left, top, right, bottom; 11029 11030 if (drawHorizontalScrollBar) { 11031 int size = scrollBar.getSize(false); 11032 if (size <= 0) { 11033 size = cache.scrollBarSize; 11034 } 11035 11036 scrollBar.setParameters(computeHorizontalScrollRange(), 11037 computeHorizontalScrollOffset(), 11038 computeHorizontalScrollExtent(), false); 11039 final int verticalScrollBarGap = drawVerticalScrollBar ? 11040 getVerticalScrollbarWidth() : 0; 11041 top = scrollY + height - size - (mUserPaddingBottom & inside); 11042 left = scrollX + (mPaddingLeft & inside); 11043 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11044 bottom = top + size; 11045 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11046 if (invalidate) { 11047 invalidate(left, top, right, bottom); 11048 } 11049 } 11050 11051 if (drawVerticalScrollBar) { 11052 int size = scrollBar.getSize(true); 11053 if (size <= 0) { 11054 size = cache.scrollBarSize; 11055 } 11056 11057 scrollBar.setParameters(computeVerticalScrollRange(), 11058 computeVerticalScrollOffset(), 11059 computeVerticalScrollExtent(), true); 11060 switch (mVerticalScrollbarPosition) { 11061 default: 11062 case SCROLLBAR_POSITION_DEFAULT: 11063 case SCROLLBAR_POSITION_RIGHT: 11064 left = scrollX + width - size - (mUserPaddingRight & inside); 11065 break; 11066 case SCROLLBAR_POSITION_LEFT: 11067 left = scrollX + (mUserPaddingLeft & inside); 11068 break; 11069 } 11070 top = scrollY + (mPaddingTop & inside); 11071 right = left + size; 11072 bottom = scrollY + height - (mUserPaddingBottom & inside); 11073 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11074 if (invalidate) { 11075 invalidate(left, top, right, bottom); 11076 } 11077 } 11078 } 11079 } 11080 } 11081 11082 /** 11083 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11084 * FastScroller is visible. 11085 * @return whether to temporarily hide the vertical scrollbar 11086 * @hide 11087 */ 11088 protected boolean isVerticalScrollBarHidden() { 11089 return false; 11090 } 11091 11092 /** 11093 * <p>Draw the horizontal scrollbar if 11094 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11095 * 11096 * @param canvas the canvas on which to draw the scrollbar 11097 * @param scrollBar the scrollbar's drawable 11098 * 11099 * @see #isHorizontalScrollBarEnabled() 11100 * @see #computeHorizontalScrollRange() 11101 * @see #computeHorizontalScrollExtent() 11102 * @see #computeHorizontalScrollOffset() 11103 * @see android.widget.ScrollBarDrawable 11104 * @hide 11105 */ 11106 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11107 int l, int t, int r, int b) { 11108 scrollBar.setBounds(l, t, r, b); 11109 scrollBar.draw(canvas); 11110 } 11111 11112 /** 11113 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11114 * returns true.</p> 11115 * 11116 * @param canvas the canvas on which to draw the scrollbar 11117 * @param scrollBar the scrollbar's drawable 11118 * 11119 * @see #isVerticalScrollBarEnabled() 11120 * @see #computeVerticalScrollRange() 11121 * @see #computeVerticalScrollExtent() 11122 * @see #computeVerticalScrollOffset() 11123 * @see android.widget.ScrollBarDrawable 11124 * @hide 11125 */ 11126 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11127 int l, int t, int r, int b) { 11128 scrollBar.setBounds(l, t, r, b); 11129 scrollBar.draw(canvas); 11130 } 11131 11132 /** 11133 * Implement this to do your drawing. 11134 * 11135 * @param canvas the canvas on which the background will be drawn 11136 */ 11137 protected void onDraw(Canvas canvas) { 11138 } 11139 11140 /* 11141 * Caller is responsible for calling requestLayout if necessary. 11142 * (This allows addViewInLayout to not request a new layout.) 11143 */ 11144 void assignParent(ViewParent parent) { 11145 if (mParent == null) { 11146 mParent = parent; 11147 } else if (parent == null) { 11148 mParent = null; 11149 } else { 11150 throw new RuntimeException("view " + this + " being added, but" 11151 + " it already has a parent"); 11152 } 11153 } 11154 11155 /** 11156 * This is called when the view is attached to a window. At this point it 11157 * has a Surface and will start drawing. Note that this function is 11158 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11159 * however it may be called any time before the first onDraw -- including 11160 * before or after {@link #onMeasure(int, int)}. 11161 * 11162 * @see #onDetachedFromWindow() 11163 */ 11164 protected void onAttachedToWindow() { 11165 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11166 mParent.requestTransparentRegion(this); 11167 } 11168 11169 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11170 initialAwakenScrollBars(); 11171 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11172 } 11173 11174 jumpDrawablesToCurrentState(); 11175 11176 // Order is important here: LayoutDirection MUST be resolved before Padding 11177 // and TextDirection 11178 resolveLayoutDirection(); 11179 resolvePadding(); 11180 resolveTextDirection(); 11181 resolveTextAlignment(); 11182 11183 clearAccessibilityFocus(); 11184 if (isFocused()) { 11185 InputMethodManager imm = InputMethodManager.peekInstance(); 11186 imm.focusIn(this); 11187 } 11188 11189 if (mAttachInfo != null && mDisplayList != null) { 11190 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11191 } 11192 } 11193 11194 /** 11195 * @see #onScreenStateChanged(int) 11196 */ 11197 void dispatchScreenStateChanged(int screenState) { 11198 onScreenStateChanged(screenState); 11199 } 11200 11201 /** 11202 * This method is called whenever the state of the screen this view is 11203 * attached to changes. A state change will usually occurs when the screen 11204 * turns on or off (whether it happens automatically or the user does it 11205 * manually.) 11206 * 11207 * @param screenState The new state of the screen. Can be either 11208 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11209 */ 11210 public void onScreenStateChanged(int screenState) { 11211 } 11212 11213 /** 11214 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11215 */ 11216 private boolean hasRtlSupport() { 11217 return mContext.getApplicationInfo().hasRtlSupport(); 11218 } 11219 11220 /** 11221 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11222 * that the parent directionality can and will be resolved before its children. 11223 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11224 */ 11225 public void resolveLayoutDirection() { 11226 // Clear any previous layout direction resolution 11227 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11228 11229 if (hasRtlSupport()) { 11230 // Set resolved depending on layout direction 11231 switch (getLayoutDirection()) { 11232 case LAYOUT_DIRECTION_INHERIT: 11233 // If this is root view, no need to look at parent's layout dir. 11234 if (canResolveLayoutDirection()) { 11235 ViewGroup viewGroup = ((ViewGroup) mParent); 11236 11237 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11238 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11239 } 11240 } else { 11241 // Nothing to do, LTR by default 11242 } 11243 break; 11244 case LAYOUT_DIRECTION_RTL: 11245 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11246 break; 11247 case LAYOUT_DIRECTION_LOCALE: 11248 if(isLayoutDirectionRtl(Locale.getDefault())) { 11249 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11250 } 11251 break; 11252 default: 11253 // Nothing to do, LTR by default 11254 } 11255 } 11256 11257 // Set to resolved 11258 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11259 onResolvedLayoutDirectionChanged(); 11260 // Resolve padding 11261 resolvePadding(); 11262 } 11263 11264 /** 11265 * Called when layout direction has been resolved. 11266 * 11267 * The default implementation does nothing. 11268 */ 11269 public void onResolvedLayoutDirectionChanged() { 11270 } 11271 11272 /** 11273 * Resolve padding depending on layout direction. 11274 */ 11275 public void resolvePadding() { 11276 // If the user specified the absolute padding (either with android:padding or 11277 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11278 // use the default padding or the padding from the background drawable 11279 // (stored at this point in mPadding*) 11280 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11281 switch (resolvedLayoutDirection) { 11282 case LAYOUT_DIRECTION_RTL: 11283 // Start user padding override Right user padding. Otherwise, if Right user 11284 // padding is not defined, use the default Right padding. If Right user padding 11285 // is defined, just use it. 11286 if (mUserPaddingStart >= 0) { 11287 mUserPaddingRight = mUserPaddingStart; 11288 } else if (mUserPaddingRight < 0) { 11289 mUserPaddingRight = mPaddingRight; 11290 } 11291 if (mUserPaddingEnd >= 0) { 11292 mUserPaddingLeft = mUserPaddingEnd; 11293 } else if (mUserPaddingLeft < 0) { 11294 mUserPaddingLeft = mPaddingLeft; 11295 } 11296 break; 11297 case LAYOUT_DIRECTION_LTR: 11298 default: 11299 // Start user padding override Left user padding. Otherwise, if Left user 11300 // padding is not defined, use the default left padding. If Left user padding 11301 // is defined, just use it. 11302 if (mUserPaddingStart >= 0) { 11303 mUserPaddingLeft = mUserPaddingStart; 11304 } else if (mUserPaddingLeft < 0) { 11305 mUserPaddingLeft = mPaddingLeft; 11306 } 11307 if (mUserPaddingEnd >= 0) { 11308 mUserPaddingRight = mUserPaddingEnd; 11309 } else if (mUserPaddingRight < 0) { 11310 mUserPaddingRight = mPaddingRight; 11311 } 11312 } 11313 11314 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11315 11316 if(isPaddingRelative()) { 11317 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11318 } else { 11319 recomputePadding(); 11320 } 11321 onPaddingChanged(resolvedLayoutDirection); 11322 } 11323 11324 /** 11325 * Resolve padding depending on the layout direction. Subclasses that care about 11326 * padding resolution should override this method. The default implementation does 11327 * nothing. 11328 * 11329 * @param layoutDirection the direction of the layout 11330 * 11331 * @see {@link #LAYOUT_DIRECTION_LTR} 11332 * @see {@link #LAYOUT_DIRECTION_RTL} 11333 */ 11334 public void onPaddingChanged(int layoutDirection) { 11335 } 11336 11337 /** 11338 * Check if layout direction resolution can be done. 11339 * 11340 * @return true if layout direction resolution can be done otherwise return false. 11341 */ 11342 public boolean canResolveLayoutDirection() { 11343 switch (getLayoutDirection()) { 11344 case LAYOUT_DIRECTION_INHERIT: 11345 return (mParent != null) && (mParent instanceof ViewGroup); 11346 default: 11347 return true; 11348 } 11349 } 11350 11351 /** 11352 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11353 * when reset is done. 11354 */ 11355 public void resetResolvedLayoutDirection() { 11356 // Reset the current resolved bits 11357 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11358 onResolvedLayoutDirectionReset(); 11359 // Reset also the text direction 11360 resetResolvedTextDirection(); 11361 } 11362 11363 /** 11364 * Called during reset of resolved layout direction. 11365 * 11366 * Subclasses need to override this method to clear cached information that depends on the 11367 * resolved layout direction, or to inform child views that inherit their layout direction. 11368 * 11369 * The default implementation does nothing. 11370 */ 11371 public void onResolvedLayoutDirectionReset() { 11372 } 11373 11374 /** 11375 * Check if a Locale uses an RTL script. 11376 * 11377 * @param locale Locale to check 11378 * @return true if the Locale uses an RTL script. 11379 */ 11380 protected static boolean isLayoutDirectionRtl(Locale locale) { 11381 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11382 } 11383 11384 /** 11385 * This is called when the view is detached from a window. At this point it 11386 * no longer has a surface for drawing. 11387 * 11388 * @see #onAttachedToWindow() 11389 */ 11390 protected void onDetachedFromWindow() { 11391 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11392 11393 removeUnsetPressCallback(); 11394 removeLongPressCallback(); 11395 removePerformClickCallback(); 11396 removeSendViewScrolledAccessibilityEventCallback(); 11397 11398 destroyDrawingCache(); 11399 11400 destroyLayer(false); 11401 11402 if (mAttachInfo != null) { 11403 if (mDisplayList != null) { 11404 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11405 } 11406 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11407 } else { 11408 if (mDisplayList != null) { 11409 // Should never happen 11410 mDisplayList.invalidate(); 11411 } 11412 } 11413 11414 mCurrentAnimation = null; 11415 11416 resetResolvedLayoutDirection(); 11417 resetResolvedTextAlignment(); 11418 resetAccessibilityStateChanged(); 11419 } 11420 11421 /** 11422 * @return The number of times this view has been attached to a window 11423 */ 11424 protected int getWindowAttachCount() { 11425 return mWindowAttachCount; 11426 } 11427 11428 /** 11429 * Retrieve a unique token identifying the window this view is attached to. 11430 * @return Return the window's token for use in 11431 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11432 */ 11433 public IBinder getWindowToken() { 11434 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11435 } 11436 11437 /** 11438 * Retrieve a unique token identifying the top-level "real" window of 11439 * the window that this view is attached to. That is, this is like 11440 * {@link #getWindowToken}, except if the window this view in is a panel 11441 * window (attached to another containing window), then the token of 11442 * the containing window is returned instead. 11443 * 11444 * @return Returns the associated window token, either 11445 * {@link #getWindowToken()} or the containing window's token. 11446 */ 11447 public IBinder getApplicationWindowToken() { 11448 AttachInfo ai = mAttachInfo; 11449 if (ai != null) { 11450 IBinder appWindowToken = ai.mPanelParentWindowToken; 11451 if (appWindowToken == null) { 11452 appWindowToken = ai.mWindowToken; 11453 } 11454 return appWindowToken; 11455 } 11456 return null; 11457 } 11458 11459 /** 11460 * Retrieve private session object this view hierarchy is using to 11461 * communicate with the window manager. 11462 * @return the session object to communicate with the window manager 11463 */ 11464 /*package*/ IWindowSession getWindowSession() { 11465 return mAttachInfo != null ? mAttachInfo.mSession : null; 11466 } 11467 11468 /** 11469 * @param info the {@link android.view.View.AttachInfo} to associated with 11470 * this view 11471 */ 11472 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11473 //System.out.println("Attached! " + this); 11474 mAttachInfo = info; 11475 mWindowAttachCount++; 11476 // We will need to evaluate the drawable state at least once. 11477 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11478 if (mFloatingTreeObserver != null) { 11479 info.mTreeObserver.merge(mFloatingTreeObserver); 11480 mFloatingTreeObserver = null; 11481 } 11482 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11483 mAttachInfo.mScrollContainers.add(this); 11484 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11485 } 11486 performCollectViewAttributes(mAttachInfo, visibility); 11487 onAttachedToWindow(); 11488 11489 ListenerInfo li = mListenerInfo; 11490 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11491 li != null ? li.mOnAttachStateChangeListeners : null; 11492 if (listeners != null && listeners.size() > 0) { 11493 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11494 // perform the dispatching. The iterator is a safe guard against listeners that 11495 // could mutate the list by calling the various add/remove methods. This prevents 11496 // the array from being modified while we iterate it. 11497 for (OnAttachStateChangeListener listener : listeners) { 11498 listener.onViewAttachedToWindow(this); 11499 } 11500 } 11501 11502 int vis = info.mWindowVisibility; 11503 if (vis != GONE) { 11504 onWindowVisibilityChanged(vis); 11505 } 11506 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11507 // If nobody has evaluated the drawable state yet, then do it now. 11508 refreshDrawableState(); 11509 } 11510 } 11511 11512 void dispatchDetachedFromWindow() { 11513 AttachInfo info = mAttachInfo; 11514 if (info != null) { 11515 int vis = info.mWindowVisibility; 11516 if (vis != GONE) { 11517 onWindowVisibilityChanged(GONE); 11518 } 11519 } 11520 11521 onDetachedFromWindow(); 11522 11523 ListenerInfo li = mListenerInfo; 11524 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11525 li != null ? li.mOnAttachStateChangeListeners : null; 11526 if (listeners != null && listeners.size() > 0) { 11527 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11528 // perform the dispatching. The iterator is a safe guard against listeners that 11529 // could mutate the list by calling the various add/remove methods. This prevents 11530 // the array from being modified while we iterate it. 11531 for (OnAttachStateChangeListener listener : listeners) { 11532 listener.onViewDetachedFromWindow(this); 11533 } 11534 } 11535 11536 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11537 mAttachInfo.mScrollContainers.remove(this); 11538 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11539 } 11540 11541 mAttachInfo = null; 11542 } 11543 11544 /** 11545 * Store this view hierarchy's frozen state into the given container. 11546 * 11547 * @param container The SparseArray in which to save the view's state. 11548 * 11549 * @see #restoreHierarchyState(android.util.SparseArray) 11550 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11551 * @see #onSaveInstanceState() 11552 */ 11553 public void saveHierarchyState(SparseArray<Parcelable> container) { 11554 dispatchSaveInstanceState(container); 11555 } 11556 11557 /** 11558 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11559 * this view and its children. May be overridden to modify how freezing happens to a 11560 * view's children; for example, some views may want to not store state for their children. 11561 * 11562 * @param container The SparseArray in which to save the view's state. 11563 * 11564 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11565 * @see #saveHierarchyState(android.util.SparseArray) 11566 * @see #onSaveInstanceState() 11567 */ 11568 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11569 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11570 mPrivateFlags &= ~SAVE_STATE_CALLED; 11571 Parcelable state = onSaveInstanceState(); 11572 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11573 throw new IllegalStateException( 11574 "Derived class did not call super.onSaveInstanceState()"); 11575 } 11576 if (state != null) { 11577 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11578 // + ": " + state); 11579 container.put(mID, state); 11580 } 11581 } 11582 } 11583 11584 /** 11585 * Hook allowing a view to generate a representation of its internal state 11586 * that can later be used to create a new instance with that same state. 11587 * This state should only contain information that is not persistent or can 11588 * not be reconstructed later. For example, you will never store your 11589 * current position on screen because that will be computed again when a 11590 * new instance of the view is placed in its view hierarchy. 11591 * <p> 11592 * Some examples of things you may store here: the current cursor position 11593 * in a text view (but usually not the text itself since that is stored in a 11594 * content provider or other persistent storage), the currently selected 11595 * item in a list view. 11596 * 11597 * @return Returns a Parcelable object containing the view's current dynamic 11598 * state, or null if there is nothing interesting to save. The 11599 * default implementation returns null. 11600 * @see #onRestoreInstanceState(android.os.Parcelable) 11601 * @see #saveHierarchyState(android.util.SparseArray) 11602 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11603 * @see #setSaveEnabled(boolean) 11604 */ 11605 protected Parcelable onSaveInstanceState() { 11606 mPrivateFlags |= SAVE_STATE_CALLED; 11607 return BaseSavedState.EMPTY_STATE; 11608 } 11609 11610 /** 11611 * Restore this view hierarchy's frozen state from the given container. 11612 * 11613 * @param container The SparseArray which holds previously frozen states. 11614 * 11615 * @see #saveHierarchyState(android.util.SparseArray) 11616 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11617 * @see #onRestoreInstanceState(android.os.Parcelable) 11618 */ 11619 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11620 dispatchRestoreInstanceState(container); 11621 } 11622 11623 /** 11624 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11625 * state for this view and its children. May be overridden to modify how restoring 11626 * happens to a view's children; for example, some views may want to not store state 11627 * for their children. 11628 * 11629 * @param container The SparseArray which holds previously saved state. 11630 * 11631 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11632 * @see #restoreHierarchyState(android.util.SparseArray) 11633 * @see #onRestoreInstanceState(android.os.Parcelable) 11634 */ 11635 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11636 if (mID != NO_ID) { 11637 Parcelable state = container.get(mID); 11638 if (state != null) { 11639 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11640 // + ": " + state); 11641 mPrivateFlags &= ~SAVE_STATE_CALLED; 11642 onRestoreInstanceState(state); 11643 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11644 throw new IllegalStateException( 11645 "Derived class did not call super.onRestoreInstanceState()"); 11646 } 11647 } 11648 } 11649 } 11650 11651 /** 11652 * Hook allowing a view to re-apply a representation of its internal state that had previously 11653 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11654 * null state. 11655 * 11656 * @param state The frozen state that had previously been returned by 11657 * {@link #onSaveInstanceState}. 11658 * 11659 * @see #onSaveInstanceState() 11660 * @see #restoreHierarchyState(android.util.SparseArray) 11661 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11662 */ 11663 protected void onRestoreInstanceState(Parcelable state) { 11664 mPrivateFlags |= SAVE_STATE_CALLED; 11665 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11666 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11667 + "received " + state.getClass().toString() + " instead. This usually happens " 11668 + "when two views of different type have the same id in the same hierarchy. " 11669 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11670 + "other views do not use the same id."); 11671 } 11672 } 11673 11674 /** 11675 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11676 * 11677 * @return the drawing start time in milliseconds 11678 */ 11679 public long getDrawingTime() { 11680 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11681 } 11682 11683 /** 11684 * <p>Enables or disables the duplication of the parent's state into this view. When 11685 * duplication is enabled, this view gets its drawable state from its parent rather 11686 * than from its own internal properties.</p> 11687 * 11688 * <p>Note: in the current implementation, setting this property to true after the 11689 * view was added to a ViewGroup might have no effect at all. This property should 11690 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11691 * 11692 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11693 * property is enabled, an exception will be thrown.</p> 11694 * 11695 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11696 * parent, these states should not be affected by this method.</p> 11697 * 11698 * @param enabled True to enable duplication of the parent's drawable state, false 11699 * to disable it. 11700 * 11701 * @see #getDrawableState() 11702 * @see #isDuplicateParentStateEnabled() 11703 */ 11704 public void setDuplicateParentStateEnabled(boolean enabled) { 11705 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11706 } 11707 11708 /** 11709 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11710 * 11711 * @return True if this view's drawable state is duplicated from the parent, 11712 * false otherwise 11713 * 11714 * @see #getDrawableState() 11715 * @see #setDuplicateParentStateEnabled(boolean) 11716 */ 11717 public boolean isDuplicateParentStateEnabled() { 11718 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11719 } 11720 11721 /** 11722 * <p>Specifies the type of layer backing this view. The layer can be 11723 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11724 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11725 * 11726 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11727 * instance that controls how the layer is composed on screen. The following 11728 * properties of the paint are taken into account when composing the layer:</p> 11729 * <ul> 11730 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11731 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11732 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11733 * </ul> 11734 * 11735 * <p>If this view has an alpha value set to < 1.0 by calling 11736 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11737 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11738 * equivalent to setting a hardware layer on this view and providing a paint with 11739 * the desired alpha value.<p> 11740 * 11741 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11742 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11743 * for more information on when and how to use layers.</p> 11744 * 11745 * @param layerType The ype of layer to use with this view, must be one of 11746 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11747 * {@link #LAYER_TYPE_HARDWARE} 11748 * @param paint The paint used to compose the layer. This argument is optional 11749 * and can be null. It is ignored when the layer type is 11750 * {@link #LAYER_TYPE_NONE} 11751 * 11752 * @see #getLayerType() 11753 * @see #LAYER_TYPE_NONE 11754 * @see #LAYER_TYPE_SOFTWARE 11755 * @see #LAYER_TYPE_HARDWARE 11756 * @see #setAlpha(float) 11757 * 11758 * @attr ref android.R.styleable#View_layerType 11759 */ 11760 public void setLayerType(int layerType, Paint paint) { 11761 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11762 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11763 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11764 } 11765 11766 if (layerType == mLayerType) { 11767 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11768 mLayerPaint = paint == null ? new Paint() : paint; 11769 invalidateParentCaches(); 11770 invalidate(true); 11771 } 11772 return; 11773 } 11774 11775 // Destroy any previous software drawing cache if needed 11776 switch (mLayerType) { 11777 case LAYER_TYPE_HARDWARE: 11778 destroyLayer(false); 11779 // fall through - non-accelerated views may use software layer mechanism instead 11780 case LAYER_TYPE_SOFTWARE: 11781 destroyDrawingCache(); 11782 break; 11783 default: 11784 break; 11785 } 11786 11787 mLayerType = layerType; 11788 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11789 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11790 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11791 11792 invalidateParentCaches(); 11793 invalidate(true); 11794 } 11795 11796 /** 11797 * Indicates whether this view has a static layer. A view with layer type 11798 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11799 * dynamic. 11800 */ 11801 boolean hasStaticLayer() { 11802 return true; 11803 } 11804 11805 /** 11806 * Indicates what type of layer is currently associated with this view. By default 11807 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11808 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11809 * for more information on the different types of layers. 11810 * 11811 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11812 * {@link #LAYER_TYPE_HARDWARE} 11813 * 11814 * @see #setLayerType(int, android.graphics.Paint) 11815 * @see #buildLayer() 11816 * @see #LAYER_TYPE_NONE 11817 * @see #LAYER_TYPE_SOFTWARE 11818 * @see #LAYER_TYPE_HARDWARE 11819 */ 11820 public int getLayerType() { 11821 return mLayerType; 11822 } 11823 11824 /** 11825 * Forces this view's layer to be created and this view to be rendered 11826 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11827 * invoking this method will have no effect. 11828 * 11829 * This method can for instance be used to render a view into its layer before 11830 * starting an animation. If this view is complex, rendering into the layer 11831 * before starting the animation will avoid skipping frames. 11832 * 11833 * @throws IllegalStateException If this view is not attached to a window 11834 * 11835 * @see #setLayerType(int, android.graphics.Paint) 11836 */ 11837 public void buildLayer() { 11838 if (mLayerType == LAYER_TYPE_NONE) return; 11839 11840 if (mAttachInfo == null) { 11841 throw new IllegalStateException("This view must be attached to a window first"); 11842 } 11843 11844 switch (mLayerType) { 11845 case LAYER_TYPE_HARDWARE: 11846 if (mAttachInfo.mHardwareRenderer != null && 11847 mAttachInfo.mHardwareRenderer.isEnabled() && 11848 mAttachInfo.mHardwareRenderer.validate()) { 11849 getHardwareLayer(); 11850 } 11851 break; 11852 case LAYER_TYPE_SOFTWARE: 11853 buildDrawingCache(true); 11854 break; 11855 } 11856 } 11857 11858 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11859 void flushLayer() { 11860 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11861 mHardwareLayer.flush(); 11862 } 11863 } 11864 11865 /** 11866 * <p>Returns a hardware layer that can be used to draw this view again 11867 * without executing its draw method.</p> 11868 * 11869 * @return A HardwareLayer ready to render, or null if an error occurred. 11870 */ 11871 HardwareLayer getHardwareLayer() { 11872 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11873 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11874 return null; 11875 } 11876 11877 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11878 11879 final int width = mRight - mLeft; 11880 final int height = mBottom - mTop; 11881 11882 if (width == 0 || height == 0) { 11883 return null; 11884 } 11885 11886 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11887 if (mHardwareLayer == null) { 11888 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11889 width, height, isOpaque()); 11890 mLocalDirtyRect.set(0, 0, width, height); 11891 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11892 mHardwareLayer.resize(width, height); 11893 mLocalDirtyRect.set(0, 0, width, height); 11894 } 11895 11896 // The layer is not valid if the underlying GPU resources cannot be allocated 11897 if (!mHardwareLayer.isValid()) { 11898 return null; 11899 } 11900 11901 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11902 mLocalDirtyRect.setEmpty(); 11903 } 11904 11905 return mHardwareLayer; 11906 } 11907 11908 /** 11909 * Destroys this View's hardware layer if possible. 11910 * 11911 * @return True if the layer was destroyed, false otherwise. 11912 * 11913 * @see #setLayerType(int, android.graphics.Paint) 11914 * @see #LAYER_TYPE_HARDWARE 11915 */ 11916 boolean destroyLayer(boolean valid) { 11917 if (mHardwareLayer != null) { 11918 AttachInfo info = mAttachInfo; 11919 if (info != null && info.mHardwareRenderer != null && 11920 info.mHardwareRenderer.isEnabled() && 11921 (valid || info.mHardwareRenderer.validate())) { 11922 mHardwareLayer.destroy(); 11923 mHardwareLayer = null; 11924 11925 invalidate(true); 11926 invalidateParentCaches(); 11927 } 11928 return true; 11929 } 11930 return false; 11931 } 11932 11933 /** 11934 * Destroys all hardware rendering resources. This method is invoked 11935 * when the system needs to reclaim resources. Upon execution of this 11936 * method, you should free any OpenGL resources created by the view. 11937 * 11938 * Note: you <strong>must</strong> call 11939 * <code>super.destroyHardwareResources()</code> when overriding 11940 * this method. 11941 * 11942 * @hide 11943 */ 11944 protected void destroyHardwareResources() { 11945 destroyLayer(true); 11946 } 11947 11948 /** 11949 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11950 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11951 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11952 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11953 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11954 * null.</p> 11955 * 11956 * <p>Enabling the drawing cache is similar to 11957 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11958 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11959 * drawing cache has no effect on rendering because the system uses a different mechanism 11960 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11961 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11962 * for information on how to enable software and hardware layers.</p> 11963 * 11964 * <p>This API can be used to manually generate 11965 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11966 * {@link #getDrawingCache()}.</p> 11967 * 11968 * @param enabled true to enable the drawing cache, false otherwise 11969 * 11970 * @see #isDrawingCacheEnabled() 11971 * @see #getDrawingCache() 11972 * @see #buildDrawingCache() 11973 * @see #setLayerType(int, android.graphics.Paint) 11974 */ 11975 public void setDrawingCacheEnabled(boolean enabled) { 11976 mCachingFailed = false; 11977 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11978 } 11979 11980 /** 11981 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11982 * 11983 * @return true if the drawing cache is enabled 11984 * 11985 * @see #setDrawingCacheEnabled(boolean) 11986 * @see #getDrawingCache() 11987 */ 11988 @ViewDebug.ExportedProperty(category = "drawing") 11989 public boolean isDrawingCacheEnabled() { 11990 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11991 } 11992 11993 /** 11994 * Debugging utility which recursively outputs the dirty state of a view and its 11995 * descendants. 11996 * 11997 * @hide 11998 */ 11999 @SuppressWarnings({"UnusedDeclaration"}) 12000 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12001 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12002 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12003 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12004 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12005 if (clear) { 12006 mPrivateFlags &= clearMask; 12007 } 12008 if (this instanceof ViewGroup) { 12009 ViewGroup parent = (ViewGroup) this; 12010 final int count = parent.getChildCount(); 12011 for (int i = 0; i < count; i++) { 12012 final View child = parent.getChildAt(i); 12013 child.outputDirtyFlags(indent + " ", clear, clearMask); 12014 } 12015 } 12016 } 12017 12018 /** 12019 * This method is used by ViewGroup to cause its children to restore or recreate their 12020 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12021 * to recreate its own display list, which would happen if it went through the normal 12022 * draw/dispatchDraw mechanisms. 12023 * 12024 * @hide 12025 */ 12026 protected void dispatchGetDisplayList() {} 12027 12028 /** 12029 * A view that is not attached or hardware accelerated cannot create a display list. 12030 * This method checks these conditions and returns the appropriate result. 12031 * 12032 * @return true if view has the ability to create a display list, false otherwise. 12033 * 12034 * @hide 12035 */ 12036 public boolean canHaveDisplayList() { 12037 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12038 } 12039 12040 /** 12041 * @return The HardwareRenderer associated with that view or null if hardware rendering 12042 * is not supported or this this has not been attached to a window. 12043 * 12044 * @hide 12045 */ 12046 public HardwareRenderer getHardwareRenderer() { 12047 if (mAttachInfo != null) { 12048 return mAttachInfo.mHardwareRenderer; 12049 } 12050 return null; 12051 } 12052 12053 /** 12054 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12055 * Otherwise, the same display list will be returned (after having been rendered into 12056 * along the way, depending on the invalidation state of the view). 12057 * 12058 * @param displayList The previous version of this displayList, could be null. 12059 * @param isLayer Whether the requester of the display list is a layer. If so, 12060 * the view will avoid creating a layer inside the resulting display list. 12061 * @return A new or reused DisplayList object. 12062 */ 12063 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12064 if (!canHaveDisplayList()) { 12065 return null; 12066 } 12067 12068 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12069 displayList == null || !displayList.isValid() || 12070 (!isLayer && mRecreateDisplayList))) { 12071 // Don't need to recreate the display list, just need to tell our 12072 // children to restore/recreate theirs 12073 if (displayList != null && displayList.isValid() && 12074 !isLayer && !mRecreateDisplayList) { 12075 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12076 mPrivateFlags &= ~DIRTY_MASK; 12077 dispatchGetDisplayList(); 12078 12079 return displayList; 12080 } 12081 12082 if (!isLayer) { 12083 // If we got here, we're recreating it. Mark it as such to ensure that 12084 // we copy in child display lists into ours in drawChild() 12085 mRecreateDisplayList = true; 12086 } 12087 if (displayList == null) { 12088 final String name = getClass().getSimpleName(); 12089 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12090 // If we're creating a new display list, make sure our parent gets invalidated 12091 // since they will need to recreate their display list to account for this 12092 // new child display list. 12093 invalidateParentCaches(); 12094 } 12095 12096 boolean caching = false; 12097 final HardwareCanvas canvas = displayList.start(); 12098 int width = mRight - mLeft; 12099 int height = mBottom - mTop; 12100 12101 try { 12102 canvas.setViewport(width, height); 12103 // The dirty rect should always be null for a display list 12104 canvas.onPreDraw(null); 12105 int layerType = ( 12106 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12107 getLayerType() : LAYER_TYPE_NONE; 12108 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12109 if (layerType == LAYER_TYPE_HARDWARE) { 12110 final HardwareLayer layer = getHardwareLayer(); 12111 if (layer != null && layer.isValid()) { 12112 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12113 } else { 12114 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12115 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12116 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12117 } 12118 caching = true; 12119 } else { 12120 buildDrawingCache(true); 12121 Bitmap cache = getDrawingCache(true); 12122 if (cache != null) { 12123 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12124 caching = true; 12125 } 12126 } 12127 } else { 12128 12129 computeScroll(); 12130 12131 canvas.translate(-mScrollX, -mScrollY); 12132 if (!isLayer) { 12133 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12134 mPrivateFlags &= ~DIRTY_MASK; 12135 } 12136 12137 // Fast path for layouts with no backgrounds 12138 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12139 dispatchDraw(canvas); 12140 } else { 12141 draw(canvas); 12142 } 12143 } 12144 } finally { 12145 canvas.onPostDraw(); 12146 12147 displayList.end(); 12148 displayList.setCaching(caching); 12149 if (isLayer) { 12150 displayList.setLeftTopRightBottom(0, 0, width, height); 12151 } else { 12152 setDisplayListProperties(displayList); 12153 } 12154 } 12155 } else if (!isLayer) { 12156 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12157 mPrivateFlags &= ~DIRTY_MASK; 12158 } 12159 12160 return displayList; 12161 } 12162 12163 /** 12164 * Get the DisplayList for the HardwareLayer 12165 * 12166 * @param layer The HardwareLayer whose DisplayList we want 12167 * @return A DisplayList fopr the specified HardwareLayer 12168 */ 12169 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12170 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12171 layer.setDisplayList(displayList); 12172 return displayList; 12173 } 12174 12175 12176 /** 12177 * <p>Returns a display list that can be used to draw this view again 12178 * without executing its draw method.</p> 12179 * 12180 * @return A DisplayList ready to replay, or null if caching is not enabled. 12181 * 12182 * @hide 12183 */ 12184 public DisplayList getDisplayList() { 12185 mDisplayList = getDisplayList(mDisplayList, false); 12186 return mDisplayList; 12187 } 12188 12189 /** 12190 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12191 * 12192 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12193 * 12194 * @see #getDrawingCache(boolean) 12195 */ 12196 public Bitmap getDrawingCache() { 12197 return getDrawingCache(false); 12198 } 12199 12200 /** 12201 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12202 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12203 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12204 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12205 * request the drawing cache by calling this method and draw it on screen if the 12206 * returned bitmap is not null.</p> 12207 * 12208 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12209 * this method will create a bitmap of the same size as this view. Because this bitmap 12210 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12211 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12212 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12213 * size than the view. This implies that your application must be able to handle this 12214 * size.</p> 12215 * 12216 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12217 * the current density of the screen when the application is in compatibility 12218 * mode. 12219 * 12220 * @return A bitmap representing this view or null if cache is disabled. 12221 * 12222 * @see #setDrawingCacheEnabled(boolean) 12223 * @see #isDrawingCacheEnabled() 12224 * @see #buildDrawingCache(boolean) 12225 * @see #destroyDrawingCache() 12226 */ 12227 public Bitmap getDrawingCache(boolean autoScale) { 12228 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12229 return null; 12230 } 12231 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12232 buildDrawingCache(autoScale); 12233 } 12234 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12235 } 12236 12237 /** 12238 * <p>Frees the resources used by the drawing cache. If you call 12239 * {@link #buildDrawingCache()} manually without calling 12240 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12241 * should cleanup the cache with this method afterwards.</p> 12242 * 12243 * @see #setDrawingCacheEnabled(boolean) 12244 * @see #buildDrawingCache() 12245 * @see #getDrawingCache() 12246 */ 12247 public void destroyDrawingCache() { 12248 if (mDrawingCache != null) { 12249 mDrawingCache.recycle(); 12250 mDrawingCache = null; 12251 } 12252 if (mUnscaledDrawingCache != null) { 12253 mUnscaledDrawingCache.recycle(); 12254 mUnscaledDrawingCache = null; 12255 } 12256 } 12257 12258 /** 12259 * Setting a solid background color for the drawing cache's bitmaps will improve 12260 * performance and memory usage. Note, though that this should only be used if this 12261 * view will always be drawn on top of a solid color. 12262 * 12263 * @param color The background color to use for the drawing cache's bitmap 12264 * 12265 * @see #setDrawingCacheEnabled(boolean) 12266 * @see #buildDrawingCache() 12267 * @see #getDrawingCache() 12268 */ 12269 public void setDrawingCacheBackgroundColor(int color) { 12270 if (color != mDrawingCacheBackgroundColor) { 12271 mDrawingCacheBackgroundColor = color; 12272 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12273 } 12274 } 12275 12276 /** 12277 * @see #setDrawingCacheBackgroundColor(int) 12278 * 12279 * @return The background color to used for the drawing cache's bitmap 12280 */ 12281 public int getDrawingCacheBackgroundColor() { 12282 return mDrawingCacheBackgroundColor; 12283 } 12284 12285 /** 12286 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12287 * 12288 * @see #buildDrawingCache(boolean) 12289 */ 12290 public void buildDrawingCache() { 12291 buildDrawingCache(false); 12292 } 12293 12294 /** 12295 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12296 * 12297 * <p>If you call {@link #buildDrawingCache()} manually without calling 12298 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12299 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12300 * 12301 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12302 * this method will create a bitmap of the same size as this view. Because this bitmap 12303 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12304 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12305 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12306 * size than the view. This implies that your application must be able to handle this 12307 * size.</p> 12308 * 12309 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12310 * you do not need the drawing cache bitmap, calling this method will increase memory 12311 * usage and cause the view to be rendered in software once, thus negatively impacting 12312 * performance.</p> 12313 * 12314 * @see #getDrawingCache() 12315 * @see #destroyDrawingCache() 12316 */ 12317 public void buildDrawingCache(boolean autoScale) { 12318 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12319 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12320 mCachingFailed = false; 12321 12322 if (ViewDebug.TRACE_HIERARCHY) { 12323 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12324 } 12325 12326 int width = mRight - mLeft; 12327 int height = mBottom - mTop; 12328 12329 final AttachInfo attachInfo = mAttachInfo; 12330 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12331 12332 if (autoScale && scalingRequired) { 12333 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12334 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12335 } 12336 12337 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12338 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12339 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12340 12341 if (width <= 0 || height <= 0 || 12342 // Projected bitmap size in bytes 12343 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12344 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12345 destroyDrawingCache(); 12346 mCachingFailed = true; 12347 return; 12348 } 12349 12350 boolean clear = true; 12351 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12352 12353 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12354 Bitmap.Config quality; 12355 if (!opaque) { 12356 // Never pick ARGB_4444 because it looks awful 12357 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12358 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12359 case DRAWING_CACHE_QUALITY_AUTO: 12360 quality = Bitmap.Config.ARGB_8888; 12361 break; 12362 case DRAWING_CACHE_QUALITY_LOW: 12363 quality = Bitmap.Config.ARGB_8888; 12364 break; 12365 case DRAWING_CACHE_QUALITY_HIGH: 12366 quality = Bitmap.Config.ARGB_8888; 12367 break; 12368 default: 12369 quality = Bitmap.Config.ARGB_8888; 12370 break; 12371 } 12372 } else { 12373 // Optimization for translucent windows 12374 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12375 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12376 } 12377 12378 // Try to cleanup memory 12379 if (bitmap != null) bitmap.recycle(); 12380 12381 try { 12382 bitmap = Bitmap.createBitmap(width, height, quality); 12383 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12384 if (autoScale) { 12385 mDrawingCache = bitmap; 12386 } else { 12387 mUnscaledDrawingCache = bitmap; 12388 } 12389 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12390 } catch (OutOfMemoryError e) { 12391 // If there is not enough memory to create the bitmap cache, just 12392 // ignore the issue as bitmap caches are not required to draw the 12393 // view hierarchy 12394 if (autoScale) { 12395 mDrawingCache = null; 12396 } else { 12397 mUnscaledDrawingCache = null; 12398 } 12399 mCachingFailed = true; 12400 return; 12401 } 12402 12403 clear = drawingCacheBackgroundColor != 0; 12404 } 12405 12406 Canvas canvas; 12407 if (attachInfo != null) { 12408 canvas = attachInfo.mCanvas; 12409 if (canvas == null) { 12410 canvas = new Canvas(); 12411 } 12412 canvas.setBitmap(bitmap); 12413 // Temporarily clobber the cached Canvas in case one of our children 12414 // is also using a drawing cache. Without this, the children would 12415 // steal the canvas by attaching their own bitmap to it and bad, bad 12416 // thing would happen (invisible views, corrupted drawings, etc.) 12417 attachInfo.mCanvas = null; 12418 } else { 12419 // This case should hopefully never or seldom happen 12420 canvas = new Canvas(bitmap); 12421 } 12422 12423 if (clear) { 12424 bitmap.eraseColor(drawingCacheBackgroundColor); 12425 } 12426 12427 computeScroll(); 12428 final int restoreCount = canvas.save(); 12429 12430 if (autoScale && scalingRequired) { 12431 final float scale = attachInfo.mApplicationScale; 12432 canvas.scale(scale, scale); 12433 } 12434 12435 canvas.translate(-mScrollX, -mScrollY); 12436 12437 mPrivateFlags |= DRAWN; 12438 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12439 mLayerType != LAYER_TYPE_NONE) { 12440 mPrivateFlags |= DRAWING_CACHE_VALID; 12441 } 12442 12443 // Fast path for layouts with no backgrounds 12444 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12445 if (ViewDebug.TRACE_HIERARCHY) { 12446 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12447 } 12448 mPrivateFlags &= ~DIRTY_MASK; 12449 dispatchDraw(canvas); 12450 } else { 12451 draw(canvas); 12452 } 12453 12454 canvas.restoreToCount(restoreCount); 12455 canvas.setBitmap(null); 12456 12457 if (attachInfo != null) { 12458 // Restore the cached Canvas for our siblings 12459 attachInfo.mCanvas = canvas; 12460 } 12461 } 12462 } 12463 12464 /** 12465 * Create a snapshot of the view into a bitmap. We should probably make 12466 * some form of this public, but should think about the API. 12467 */ 12468 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12469 int width = mRight - mLeft; 12470 int height = mBottom - mTop; 12471 12472 final AttachInfo attachInfo = mAttachInfo; 12473 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12474 width = (int) ((width * scale) + 0.5f); 12475 height = (int) ((height * scale) + 0.5f); 12476 12477 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12478 if (bitmap == null) { 12479 throw new OutOfMemoryError(); 12480 } 12481 12482 Resources resources = getResources(); 12483 if (resources != null) { 12484 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12485 } 12486 12487 Canvas canvas; 12488 if (attachInfo != null) { 12489 canvas = attachInfo.mCanvas; 12490 if (canvas == null) { 12491 canvas = new Canvas(); 12492 } 12493 canvas.setBitmap(bitmap); 12494 // Temporarily clobber the cached Canvas in case one of our children 12495 // is also using a drawing cache. Without this, the children would 12496 // steal the canvas by attaching their own bitmap to it and bad, bad 12497 // things would happen (invisible views, corrupted drawings, etc.) 12498 attachInfo.mCanvas = null; 12499 } else { 12500 // This case should hopefully never or seldom happen 12501 canvas = new Canvas(bitmap); 12502 } 12503 12504 if ((backgroundColor & 0xff000000) != 0) { 12505 bitmap.eraseColor(backgroundColor); 12506 } 12507 12508 computeScroll(); 12509 final int restoreCount = canvas.save(); 12510 canvas.scale(scale, scale); 12511 canvas.translate(-mScrollX, -mScrollY); 12512 12513 // Temporarily remove the dirty mask 12514 int flags = mPrivateFlags; 12515 mPrivateFlags &= ~DIRTY_MASK; 12516 12517 // Fast path for layouts with no backgrounds 12518 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12519 dispatchDraw(canvas); 12520 } else { 12521 draw(canvas); 12522 } 12523 12524 mPrivateFlags = flags; 12525 12526 canvas.restoreToCount(restoreCount); 12527 canvas.setBitmap(null); 12528 12529 if (attachInfo != null) { 12530 // Restore the cached Canvas for our siblings 12531 attachInfo.mCanvas = canvas; 12532 } 12533 12534 return bitmap; 12535 } 12536 12537 /** 12538 * Indicates whether this View is currently in edit mode. A View is usually 12539 * in edit mode when displayed within a developer tool. For instance, if 12540 * this View is being drawn by a visual user interface builder, this method 12541 * should return true. 12542 * 12543 * Subclasses should check the return value of this method to provide 12544 * different behaviors if their normal behavior might interfere with the 12545 * host environment. For instance: the class spawns a thread in its 12546 * constructor, the drawing code relies on device-specific features, etc. 12547 * 12548 * This method is usually checked in the drawing code of custom widgets. 12549 * 12550 * @return True if this View is in edit mode, false otherwise. 12551 */ 12552 public boolean isInEditMode() { 12553 return false; 12554 } 12555 12556 /** 12557 * If the View draws content inside its padding and enables fading edges, 12558 * it needs to support padding offsets. Padding offsets are added to the 12559 * fading edges to extend the length of the fade so that it covers pixels 12560 * drawn inside the padding. 12561 * 12562 * Subclasses of this class should override this method if they need 12563 * to draw content inside the padding. 12564 * 12565 * @return True if padding offset must be applied, false otherwise. 12566 * 12567 * @see #getLeftPaddingOffset() 12568 * @see #getRightPaddingOffset() 12569 * @see #getTopPaddingOffset() 12570 * @see #getBottomPaddingOffset() 12571 * 12572 * @since CURRENT 12573 */ 12574 protected boolean isPaddingOffsetRequired() { 12575 return false; 12576 } 12577 12578 /** 12579 * Amount by which to extend the left fading region. Called only when 12580 * {@link #isPaddingOffsetRequired()} returns true. 12581 * 12582 * @return The left padding offset in pixels. 12583 * 12584 * @see #isPaddingOffsetRequired() 12585 * 12586 * @since CURRENT 12587 */ 12588 protected int getLeftPaddingOffset() { 12589 return 0; 12590 } 12591 12592 /** 12593 * Amount by which to extend the right fading region. Called only when 12594 * {@link #isPaddingOffsetRequired()} returns true. 12595 * 12596 * @return The right padding offset in pixels. 12597 * 12598 * @see #isPaddingOffsetRequired() 12599 * 12600 * @since CURRENT 12601 */ 12602 protected int getRightPaddingOffset() { 12603 return 0; 12604 } 12605 12606 /** 12607 * Amount by which to extend the top fading region. Called only when 12608 * {@link #isPaddingOffsetRequired()} returns true. 12609 * 12610 * @return The top padding offset in pixels. 12611 * 12612 * @see #isPaddingOffsetRequired() 12613 * 12614 * @since CURRENT 12615 */ 12616 protected int getTopPaddingOffset() { 12617 return 0; 12618 } 12619 12620 /** 12621 * Amount by which to extend the bottom fading region. Called only when 12622 * {@link #isPaddingOffsetRequired()} returns true. 12623 * 12624 * @return The bottom padding offset in pixels. 12625 * 12626 * @see #isPaddingOffsetRequired() 12627 * 12628 * @since CURRENT 12629 */ 12630 protected int getBottomPaddingOffset() { 12631 return 0; 12632 } 12633 12634 /** 12635 * @hide 12636 * @param offsetRequired 12637 */ 12638 protected int getFadeTop(boolean offsetRequired) { 12639 int top = mPaddingTop; 12640 if (offsetRequired) top += getTopPaddingOffset(); 12641 return top; 12642 } 12643 12644 /** 12645 * @hide 12646 * @param offsetRequired 12647 */ 12648 protected int getFadeHeight(boolean offsetRequired) { 12649 int padding = mPaddingTop; 12650 if (offsetRequired) padding += getTopPaddingOffset(); 12651 return mBottom - mTop - mPaddingBottom - padding; 12652 } 12653 12654 /** 12655 * <p>Indicates whether this view is attached to a hardware accelerated 12656 * window or not.</p> 12657 * 12658 * <p>Even if this method returns true, it does not mean that every call 12659 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12660 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12661 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12662 * window is hardware accelerated, 12663 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12664 * return false, and this method will return true.</p> 12665 * 12666 * @return True if the view is attached to a window and the window is 12667 * hardware accelerated; false in any other case. 12668 */ 12669 public boolean isHardwareAccelerated() { 12670 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12671 } 12672 12673 /** 12674 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12675 * case of an active Animation being run on the view. 12676 */ 12677 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12678 Animation a, boolean scalingRequired) { 12679 Transformation invalidationTransform; 12680 final int flags = parent.mGroupFlags; 12681 final boolean initialized = a.isInitialized(); 12682 if (!initialized) { 12683 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12684 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12685 onAnimationStart(); 12686 } 12687 12688 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12689 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12690 if (parent.mInvalidationTransformation == null) { 12691 parent.mInvalidationTransformation = new Transformation(); 12692 } 12693 invalidationTransform = parent.mInvalidationTransformation; 12694 a.getTransformation(drawingTime, invalidationTransform, 1f); 12695 } else { 12696 invalidationTransform = parent.mChildTransformation; 12697 } 12698 if (more) { 12699 if (!a.willChangeBounds()) { 12700 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12701 parent.FLAG_OPTIMIZE_INVALIDATE) { 12702 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12703 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12704 // The child need to draw an animation, potentially offscreen, so 12705 // make sure we do not cancel invalidate requests 12706 parent.mPrivateFlags |= DRAW_ANIMATION; 12707 parent.invalidate(mLeft, mTop, mRight, mBottom); 12708 } 12709 } else { 12710 if (parent.mInvalidateRegion == null) { 12711 parent.mInvalidateRegion = new RectF(); 12712 } 12713 final RectF region = parent.mInvalidateRegion; 12714 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12715 invalidationTransform); 12716 12717 // The child need to draw an animation, potentially offscreen, so 12718 // make sure we do not cancel invalidate requests 12719 parent.mPrivateFlags |= DRAW_ANIMATION; 12720 12721 final int left = mLeft + (int) region.left; 12722 final int top = mTop + (int) region.top; 12723 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12724 top + (int) (region.height() + .5f)); 12725 } 12726 } 12727 return more; 12728 } 12729 12730 /** 12731 * This method is called by getDisplayList() when a display list is created or re-rendered. 12732 * It sets or resets the current value of all properties on that display list (resetting is 12733 * necessary when a display list is being re-created, because we need to make sure that 12734 * previously-set transform values 12735 */ 12736 void setDisplayListProperties(DisplayList displayList) { 12737 if (displayList != null) { 12738 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12739 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12740 if (mParent instanceof ViewGroup) { 12741 displayList.setClipChildren( 12742 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12743 } 12744 float alpha = 1; 12745 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12746 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12747 ViewGroup parentVG = (ViewGroup) mParent; 12748 final boolean hasTransform = 12749 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12750 if (hasTransform) { 12751 Transformation transform = parentVG.mChildTransformation; 12752 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12753 if (transformType != Transformation.TYPE_IDENTITY) { 12754 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12755 alpha = transform.getAlpha(); 12756 } 12757 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12758 displayList.setStaticMatrix(transform.getMatrix()); 12759 } 12760 } 12761 } 12762 } 12763 if (mTransformationInfo != null) { 12764 alpha *= mTransformationInfo.mAlpha; 12765 if (alpha < 1) { 12766 final int multipliedAlpha = (int) (255 * alpha); 12767 if (onSetAlpha(multipliedAlpha)) { 12768 alpha = 1; 12769 } 12770 } 12771 displayList.setTransformationInfo(alpha, 12772 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12773 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12774 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12775 mTransformationInfo.mScaleY); 12776 if (mTransformationInfo.mCamera == null) { 12777 mTransformationInfo.mCamera = new Camera(); 12778 mTransformationInfo.matrix3D = new Matrix(); 12779 } 12780 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12781 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12782 displayList.setPivotX(getPivotX()); 12783 displayList.setPivotY(getPivotY()); 12784 } 12785 } else if (alpha < 1) { 12786 displayList.setAlpha(alpha); 12787 } 12788 } 12789 } 12790 12791 /** 12792 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12793 * This draw() method is an implementation detail and is not intended to be overridden or 12794 * to be called from anywhere else other than ViewGroup.drawChild(). 12795 */ 12796 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12797 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12798 boolean more = false; 12799 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12800 final int flags = parent.mGroupFlags; 12801 12802 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12803 parent.mChildTransformation.clear(); 12804 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12805 } 12806 12807 Transformation transformToApply = null; 12808 boolean concatMatrix = false; 12809 12810 boolean scalingRequired = false; 12811 boolean caching; 12812 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12813 12814 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12815 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12816 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12817 caching = true; 12818 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12819 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12820 } else { 12821 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12822 } 12823 12824 final Animation a = getAnimation(); 12825 if (a != null) { 12826 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12827 concatMatrix = a.willChangeTransformationMatrix(); 12828 if (concatMatrix) { 12829 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12830 } 12831 transformToApply = parent.mChildTransformation; 12832 } else { 12833 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12834 mDisplayList != null) { 12835 // No longer animating: clear out old animation matrix 12836 mDisplayList.setAnimationMatrix(null); 12837 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12838 } 12839 if (!useDisplayListProperties && 12840 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12841 final boolean hasTransform = 12842 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12843 if (hasTransform) { 12844 final int transformType = parent.mChildTransformation.getTransformationType(); 12845 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12846 parent.mChildTransformation : null; 12847 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12848 } 12849 } 12850 } 12851 12852 concatMatrix |= !childHasIdentityMatrix; 12853 12854 // Sets the flag as early as possible to allow draw() implementations 12855 // to call invalidate() successfully when doing animations 12856 mPrivateFlags |= DRAWN; 12857 12858 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12859 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12860 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12861 return more; 12862 } 12863 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12864 12865 if (hardwareAccelerated) { 12866 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12867 // retain the flag's value temporarily in the mRecreateDisplayList flag 12868 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12869 mPrivateFlags &= ~INVALIDATED; 12870 } 12871 12872 computeScroll(); 12873 12874 final int sx = mScrollX; 12875 final int sy = mScrollY; 12876 12877 DisplayList displayList = null; 12878 Bitmap cache = null; 12879 boolean hasDisplayList = false; 12880 if (caching) { 12881 if (!hardwareAccelerated) { 12882 if (layerType != LAYER_TYPE_NONE) { 12883 layerType = LAYER_TYPE_SOFTWARE; 12884 buildDrawingCache(true); 12885 } 12886 cache = getDrawingCache(true); 12887 } else { 12888 switch (layerType) { 12889 case LAYER_TYPE_SOFTWARE: 12890 if (useDisplayListProperties) { 12891 hasDisplayList = canHaveDisplayList(); 12892 } else { 12893 buildDrawingCache(true); 12894 cache = getDrawingCache(true); 12895 } 12896 break; 12897 case LAYER_TYPE_HARDWARE: 12898 if (useDisplayListProperties) { 12899 hasDisplayList = canHaveDisplayList(); 12900 } 12901 break; 12902 case LAYER_TYPE_NONE: 12903 // Delay getting the display list until animation-driven alpha values are 12904 // set up and possibly passed on to the view 12905 hasDisplayList = canHaveDisplayList(); 12906 break; 12907 } 12908 } 12909 } 12910 useDisplayListProperties &= hasDisplayList; 12911 if (useDisplayListProperties) { 12912 displayList = getDisplayList(); 12913 if (!displayList.isValid()) { 12914 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12915 // to getDisplayList(), the display list will be marked invalid and we should not 12916 // try to use it again. 12917 displayList = null; 12918 hasDisplayList = false; 12919 useDisplayListProperties = false; 12920 } 12921 } 12922 12923 final boolean hasNoCache = cache == null || hasDisplayList; 12924 final boolean offsetForScroll = cache == null && !hasDisplayList && 12925 layerType != LAYER_TYPE_HARDWARE; 12926 12927 int restoreTo = -1; 12928 if (!useDisplayListProperties || transformToApply != null) { 12929 restoreTo = canvas.save(); 12930 } 12931 if (offsetForScroll) { 12932 canvas.translate(mLeft - sx, mTop - sy); 12933 } else { 12934 if (!useDisplayListProperties) { 12935 canvas.translate(mLeft, mTop); 12936 } 12937 if (scalingRequired) { 12938 if (useDisplayListProperties) { 12939 // TODO: Might not need this if we put everything inside the DL 12940 restoreTo = canvas.save(); 12941 } 12942 // mAttachInfo cannot be null, otherwise scalingRequired == false 12943 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12944 canvas.scale(scale, scale); 12945 } 12946 } 12947 12948 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12949 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12950 if (transformToApply != null || !childHasIdentityMatrix) { 12951 int transX = 0; 12952 int transY = 0; 12953 12954 if (offsetForScroll) { 12955 transX = -sx; 12956 transY = -sy; 12957 } 12958 12959 if (transformToApply != null) { 12960 if (concatMatrix) { 12961 if (useDisplayListProperties) { 12962 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12963 } else { 12964 // Undo the scroll translation, apply the transformation matrix, 12965 // then redo the scroll translate to get the correct result. 12966 canvas.translate(-transX, -transY); 12967 canvas.concat(transformToApply.getMatrix()); 12968 canvas.translate(transX, transY); 12969 } 12970 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12971 } 12972 12973 float transformAlpha = transformToApply.getAlpha(); 12974 if (transformAlpha < 1) { 12975 alpha *= transformToApply.getAlpha(); 12976 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12977 } 12978 } 12979 12980 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12981 canvas.translate(-transX, -transY); 12982 canvas.concat(getMatrix()); 12983 canvas.translate(transX, transY); 12984 } 12985 } 12986 12987 if (alpha < 1) { 12988 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12989 if (hasNoCache) { 12990 final int multipliedAlpha = (int) (255 * alpha); 12991 if (!onSetAlpha(multipliedAlpha)) { 12992 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12993 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12994 layerType != LAYER_TYPE_NONE) { 12995 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12996 } 12997 if (useDisplayListProperties) { 12998 displayList.setAlpha(alpha * getAlpha()); 12999 } else if (layerType == LAYER_TYPE_NONE) { 13000 final int scrollX = hasDisplayList ? 0 : sx; 13001 final int scrollY = hasDisplayList ? 0 : sy; 13002 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13003 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13004 } 13005 } else { 13006 // Alpha is handled by the child directly, clobber the layer's alpha 13007 mPrivateFlags |= ALPHA_SET; 13008 } 13009 } 13010 } 13011 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13012 onSetAlpha(255); 13013 mPrivateFlags &= ~ALPHA_SET; 13014 } 13015 13016 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13017 !useDisplayListProperties) { 13018 if (offsetForScroll) { 13019 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13020 } else { 13021 if (!scalingRequired || cache == null) { 13022 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13023 } else { 13024 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13025 } 13026 } 13027 } 13028 13029 if (!useDisplayListProperties && hasDisplayList) { 13030 displayList = getDisplayList(); 13031 if (!displayList.isValid()) { 13032 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13033 // to getDisplayList(), the display list will be marked invalid and we should not 13034 // try to use it again. 13035 displayList = null; 13036 hasDisplayList = false; 13037 } 13038 } 13039 13040 if (hasNoCache) { 13041 boolean layerRendered = false; 13042 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13043 final HardwareLayer layer = getHardwareLayer(); 13044 if (layer != null && layer.isValid()) { 13045 mLayerPaint.setAlpha((int) (alpha * 255)); 13046 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13047 layerRendered = true; 13048 } else { 13049 final int scrollX = hasDisplayList ? 0 : sx; 13050 final int scrollY = hasDisplayList ? 0 : sy; 13051 canvas.saveLayer(scrollX, scrollY, 13052 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13053 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13054 } 13055 } 13056 13057 if (!layerRendered) { 13058 if (!hasDisplayList) { 13059 // Fast path for layouts with no backgrounds 13060 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13061 if (ViewDebug.TRACE_HIERARCHY) { 13062 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 13063 } 13064 mPrivateFlags &= ~DIRTY_MASK; 13065 dispatchDraw(canvas); 13066 } else { 13067 draw(canvas); 13068 } 13069 } else { 13070 mPrivateFlags &= ~DIRTY_MASK; 13071 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13072 } 13073 } 13074 } else if (cache != null) { 13075 mPrivateFlags &= ~DIRTY_MASK; 13076 Paint cachePaint; 13077 13078 if (layerType == LAYER_TYPE_NONE) { 13079 cachePaint = parent.mCachePaint; 13080 if (cachePaint == null) { 13081 cachePaint = new Paint(); 13082 cachePaint.setDither(false); 13083 parent.mCachePaint = cachePaint; 13084 } 13085 if (alpha < 1) { 13086 cachePaint.setAlpha((int) (alpha * 255)); 13087 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13088 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13089 cachePaint.setAlpha(255); 13090 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13091 } 13092 } else { 13093 cachePaint = mLayerPaint; 13094 cachePaint.setAlpha((int) (alpha * 255)); 13095 } 13096 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13097 } 13098 13099 if (restoreTo >= 0) { 13100 canvas.restoreToCount(restoreTo); 13101 } 13102 13103 if (a != null && !more) { 13104 if (!hardwareAccelerated && !a.getFillAfter()) { 13105 onSetAlpha(255); 13106 } 13107 parent.finishAnimatingView(this, a); 13108 } 13109 13110 if (more && hardwareAccelerated) { 13111 // invalidation is the trigger to recreate display lists, so if we're using 13112 // display lists to render, force an invalidate to allow the animation to 13113 // continue drawing another frame 13114 parent.invalidate(true); 13115 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13116 // alpha animations should cause the child to recreate its display list 13117 invalidate(true); 13118 } 13119 } 13120 13121 mRecreateDisplayList = false; 13122 13123 return more; 13124 } 13125 13126 /** 13127 * Manually render this view (and all of its children) to the given Canvas. 13128 * The view must have already done a full layout before this function is 13129 * called. When implementing a view, implement 13130 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13131 * If you do need to override this method, call the superclass version. 13132 * 13133 * @param canvas The Canvas to which the View is rendered. 13134 */ 13135 public void draw(Canvas canvas) { 13136 if (ViewDebug.TRACE_HIERARCHY) { 13137 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13138 } 13139 13140 final int privateFlags = mPrivateFlags; 13141 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13142 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13143 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13144 13145 /* 13146 * Draw traversal performs several drawing steps which must be executed 13147 * in the appropriate order: 13148 * 13149 * 1. Draw the background 13150 * 2. If necessary, save the canvas' layers to prepare for fading 13151 * 3. Draw view's content 13152 * 4. Draw children 13153 * 5. If necessary, draw the fading edges and restore layers 13154 * 6. Draw decorations (scrollbars for instance) 13155 */ 13156 13157 // Step 1, draw the background, if needed 13158 int saveCount; 13159 13160 if (!dirtyOpaque) { 13161 final Drawable background = mBackground; 13162 if (background != null) { 13163 final int scrollX = mScrollX; 13164 final int scrollY = mScrollY; 13165 13166 if (mBackgroundSizeChanged) { 13167 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13168 mBackgroundSizeChanged = false; 13169 } 13170 13171 if ((scrollX | scrollY) == 0) { 13172 background.draw(canvas); 13173 } else { 13174 canvas.translate(scrollX, scrollY); 13175 background.draw(canvas); 13176 canvas.translate(-scrollX, -scrollY); 13177 } 13178 } 13179 } 13180 13181 // skip step 2 & 5 if possible (common case) 13182 final int viewFlags = mViewFlags; 13183 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13184 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13185 if (!verticalEdges && !horizontalEdges) { 13186 // Step 3, draw the content 13187 if (!dirtyOpaque) onDraw(canvas); 13188 13189 // Step 4, draw the children 13190 dispatchDraw(canvas); 13191 13192 // Step 6, draw decorations (scrollbars) 13193 onDrawScrollBars(canvas); 13194 13195 // we're done... 13196 return; 13197 } 13198 13199 /* 13200 * Here we do the full fledged routine... 13201 * (this is an uncommon case where speed matters less, 13202 * this is why we repeat some of the tests that have been 13203 * done above) 13204 */ 13205 13206 boolean drawTop = false; 13207 boolean drawBottom = false; 13208 boolean drawLeft = false; 13209 boolean drawRight = false; 13210 13211 float topFadeStrength = 0.0f; 13212 float bottomFadeStrength = 0.0f; 13213 float leftFadeStrength = 0.0f; 13214 float rightFadeStrength = 0.0f; 13215 13216 // Step 2, save the canvas' layers 13217 int paddingLeft = mPaddingLeft; 13218 13219 final boolean offsetRequired = isPaddingOffsetRequired(); 13220 if (offsetRequired) { 13221 paddingLeft += getLeftPaddingOffset(); 13222 } 13223 13224 int left = mScrollX + paddingLeft; 13225 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13226 int top = mScrollY + getFadeTop(offsetRequired); 13227 int bottom = top + getFadeHeight(offsetRequired); 13228 13229 if (offsetRequired) { 13230 right += getRightPaddingOffset(); 13231 bottom += getBottomPaddingOffset(); 13232 } 13233 13234 final ScrollabilityCache scrollabilityCache = mScrollCache; 13235 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13236 int length = (int) fadeHeight; 13237 13238 // clip the fade length if top and bottom fades overlap 13239 // overlapping fades produce odd-looking artifacts 13240 if (verticalEdges && (top + length > bottom - length)) { 13241 length = (bottom - top) / 2; 13242 } 13243 13244 // also clip horizontal fades if necessary 13245 if (horizontalEdges && (left + length > right - length)) { 13246 length = (right - left) / 2; 13247 } 13248 13249 if (verticalEdges) { 13250 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13251 drawTop = topFadeStrength * fadeHeight > 1.0f; 13252 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13253 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13254 } 13255 13256 if (horizontalEdges) { 13257 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13258 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13259 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13260 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13261 } 13262 13263 saveCount = canvas.getSaveCount(); 13264 13265 int solidColor = getSolidColor(); 13266 if (solidColor == 0) { 13267 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13268 13269 if (drawTop) { 13270 canvas.saveLayer(left, top, right, top + length, null, flags); 13271 } 13272 13273 if (drawBottom) { 13274 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13275 } 13276 13277 if (drawLeft) { 13278 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13279 } 13280 13281 if (drawRight) { 13282 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13283 } 13284 } else { 13285 scrollabilityCache.setFadeColor(solidColor); 13286 } 13287 13288 // Step 3, draw the content 13289 if (!dirtyOpaque) onDraw(canvas); 13290 13291 // Step 4, draw the children 13292 dispatchDraw(canvas); 13293 13294 // Step 5, draw the fade effect and restore layers 13295 final Paint p = scrollabilityCache.paint; 13296 final Matrix matrix = scrollabilityCache.matrix; 13297 final Shader fade = scrollabilityCache.shader; 13298 13299 if (drawTop) { 13300 matrix.setScale(1, fadeHeight * topFadeStrength); 13301 matrix.postTranslate(left, top); 13302 fade.setLocalMatrix(matrix); 13303 canvas.drawRect(left, top, right, top + length, p); 13304 } 13305 13306 if (drawBottom) { 13307 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13308 matrix.postRotate(180); 13309 matrix.postTranslate(left, bottom); 13310 fade.setLocalMatrix(matrix); 13311 canvas.drawRect(left, bottom - length, right, bottom, p); 13312 } 13313 13314 if (drawLeft) { 13315 matrix.setScale(1, fadeHeight * leftFadeStrength); 13316 matrix.postRotate(-90); 13317 matrix.postTranslate(left, top); 13318 fade.setLocalMatrix(matrix); 13319 canvas.drawRect(left, top, left + length, bottom, p); 13320 } 13321 13322 if (drawRight) { 13323 matrix.setScale(1, fadeHeight * rightFadeStrength); 13324 matrix.postRotate(90); 13325 matrix.postTranslate(right, top); 13326 fade.setLocalMatrix(matrix); 13327 canvas.drawRect(right - length, top, right, bottom, p); 13328 } 13329 13330 canvas.restoreToCount(saveCount); 13331 13332 // Step 6, draw decorations (scrollbars) 13333 onDrawScrollBars(canvas); 13334 } 13335 13336 /** 13337 * Override this if your view is known to always be drawn on top of a solid color background, 13338 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13339 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13340 * should be set to 0xFF. 13341 * 13342 * @see #setVerticalFadingEdgeEnabled(boolean) 13343 * @see #setHorizontalFadingEdgeEnabled(boolean) 13344 * 13345 * @return The known solid color background for this view, or 0 if the color may vary 13346 */ 13347 @ViewDebug.ExportedProperty(category = "drawing") 13348 public int getSolidColor() { 13349 return 0; 13350 } 13351 13352 /** 13353 * Build a human readable string representation of the specified view flags. 13354 * 13355 * @param flags the view flags to convert to a string 13356 * @return a String representing the supplied flags 13357 */ 13358 private static String printFlags(int flags) { 13359 String output = ""; 13360 int numFlags = 0; 13361 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13362 output += "TAKES_FOCUS"; 13363 numFlags++; 13364 } 13365 13366 switch (flags & VISIBILITY_MASK) { 13367 case INVISIBLE: 13368 if (numFlags > 0) { 13369 output += " "; 13370 } 13371 output += "INVISIBLE"; 13372 // USELESS HERE numFlags++; 13373 break; 13374 case GONE: 13375 if (numFlags > 0) { 13376 output += " "; 13377 } 13378 output += "GONE"; 13379 // USELESS HERE numFlags++; 13380 break; 13381 default: 13382 break; 13383 } 13384 return output; 13385 } 13386 13387 /** 13388 * Build a human readable string representation of the specified private 13389 * view flags. 13390 * 13391 * @param privateFlags the private view flags to convert to a string 13392 * @return a String representing the supplied flags 13393 */ 13394 private static String printPrivateFlags(int privateFlags) { 13395 String output = ""; 13396 int numFlags = 0; 13397 13398 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13399 output += "WANTS_FOCUS"; 13400 numFlags++; 13401 } 13402 13403 if ((privateFlags & FOCUSED) == FOCUSED) { 13404 if (numFlags > 0) { 13405 output += " "; 13406 } 13407 output += "FOCUSED"; 13408 numFlags++; 13409 } 13410 13411 if ((privateFlags & SELECTED) == SELECTED) { 13412 if (numFlags > 0) { 13413 output += " "; 13414 } 13415 output += "SELECTED"; 13416 numFlags++; 13417 } 13418 13419 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13420 if (numFlags > 0) { 13421 output += " "; 13422 } 13423 output += "IS_ROOT_NAMESPACE"; 13424 numFlags++; 13425 } 13426 13427 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13428 if (numFlags > 0) { 13429 output += " "; 13430 } 13431 output += "HAS_BOUNDS"; 13432 numFlags++; 13433 } 13434 13435 if ((privateFlags & DRAWN) == DRAWN) { 13436 if (numFlags > 0) { 13437 output += " "; 13438 } 13439 output += "DRAWN"; 13440 // USELESS HERE numFlags++; 13441 } 13442 return output; 13443 } 13444 13445 /** 13446 * <p>Indicates whether or not this view's layout will be requested during 13447 * the next hierarchy layout pass.</p> 13448 * 13449 * @return true if the layout will be forced during next layout pass 13450 */ 13451 public boolean isLayoutRequested() { 13452 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13453 } 13454 13455 /** 13456 * Assign a size and position to a view and all of its 13457 * descendants 13458 * 13459 * <p>This is the second phase of the layout mechanism. 13460 * (The first is measuring). In this phase, each parent calls 13461 * layout on all of its children to position them. 13462 * This is typically done using the child measurements 13463 * that were stored in the measure pass().</p> 13464 * 13465 * <p>Derived classes should not override this method. 13466 * Derived classes with children should override 13467 * onLayout. In that method, they should 13468 * call layout on each of their children.</p> 13469 * 13470 * @param l Left position, relative to parent 13471 * @param t Top position, relative to parent 13472 * @param r Right position, relative to parent 13473 * @param b Bottom position, relative to parent 13474 */ 13475 @SuppressWarnings({"unchecked"}) 13476 public void layout(int l, int t, int r, int b) { 13477 int oldL = mLeft; 13478 int oldT = mTop; 13479 int oldB = mBottom; 13480 int oldR = mRight; 13481 boolean changed = setFrame(l, t, r, b); 13482 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13483 if (ViewDebug.TRACE_HIERARCHY) { 13484 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13485 } 13486 13487 onLayout(changed, l, t, r, b); 13488 mPrivateFlags &= ~LAYOUT_REQUIRED; 13489 13490 ListenerInfo li = mListenerInfo; 13491 if (li != null && li.mOnLayoutChangeListeners != null) { 13492 ArrayList<OnLayoutChangeListener> listenersCopy = 13493 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13494 int numListeners = listenersCopy.size(); 13495 for (int i = 0; i < numListeners; ++i) { 13496 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13497 } 13498 } 13499 } 13500 mPrivateFlags &= ~FORCE_LAYOUT; 13501 } 13502 13503 /** 13504 * Called from layout when this view should 13505 * assign a size and position to each of its children. 13506 * 13507 * Derived classes with children should override 13508 * this method and call layout on each of 13509 * their children. 13510 * @param changed This is a new size or position for this view 13511 * @param left Left position, relative to parent 13512 * @param top Top position, relative to parent 13513 * @param right Right position, relative to parent 13514 * @param bottom Bottom position, relative to parent 13515 */ 13516 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13517 } 13518 13519 /** 13520 * Assign a size and position to this view. 13521 * 13522 * This is called from layout. 13523 * 13524 * @param left Left position, relative to parent 13525 * @param top Top position, relative to parent 13526 * @param right Right position, relative to parent 13527 * @param bottom Bottom position, relative to parent 13528 * @return true if the new size and position are different than the 13529 * previous ones 13530 * {@hide} 13531 */ 13532 protected boolean setFrame(int left, int top, int right, int bottom) { 13533 boolean changed = false; 13534 13535 if (DBG) { 13536 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13537 + right + "," + bottom + ")"); 13538 } 13539 13540 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13541 changed = true; 13542 13543 // Remember our drawn bit 13544 int drawn = mPrivateFlags & DRAWN; 13545 13546 int oldWidth = mRight - mLeft; 13547 int oldHeight = mBottom - mTop; 13548 int newWidth = right - left; 13549 int newHeight = bottom - top; 13550 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13551 13552 // Invalidate our old position 13553 invalidate(sizeChanged); 13554 13555 mLeft = left; 13556 mTop = top; 13557 mRight = right; 13558 mBottom = bottom; 13559 if (mDisplayList != null) { 13560 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13561 } 13562 13563 mPrivateFlags |= HAS_BOUNDS; 13564 13565 13566 if (sizeChanged) { 13567 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13568 // A change in dimension means an auto-centered pivot point changes, too 13569 if (mTransformationInfo != null) { 13570 mTransformationInfo.mMatrixDirty = true; 13571 } 13572 } 13573 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13574 } 13575 13576 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13577 // If we are visible, force the DRAWN bit to on so that 13578 // this invalidate will go through (at least to our parent). 13579 // This is because someone may have invalidated this view 13580 // before this call to setFrame came in, thereby clearing 13581 // the DRAWN bit. 13582 mPrivateFlags |= DRAWN; 13583 invalidate(sizeChanged); 13584 // parent display list may need to be recreated based on a change in the bounds 13585 // of any child 13586 invalidateParentCaches(); 13587 } 13588 13589 // Reset drawn bit to original value (invalidate turns it off) 13590 mPrivateFlags |= drawn; 13591 13592 mBackgroundSizeChanged = true; 13593 } 13594 return changed; 13595 } 13596 13597 /** 13598 * Finalize inflating a view from XML. This is called as the last phase 13599 * of inflation, after all child views have been added. 13600 * 13601 * <p>Even if the subclass overrides onFinishInflate, they should always be 13602 * sure to call the super method, so that we get called. 13603 */ 13604 protected void onFinishInflate() { 13605 } 13606 13607 /** 13608 * Returns the resources associated with this view. 13609 * 13610 * @return Resources object. 13611 */ 13612 public Resources getResources() { 13613 return mResources; 13614 } 13615 13616 /** 13617 * Invalidates the specified Drawable. 13618 * 13619 * @param drawable the drawable to invalidate 13620 */ 13621 public void invalidateDrawable(Drawable drawable) { 13622 if (verifyDrawable(drawable)) { 13623 final Rect dirty = drawable.getBounds(); 13624 final int scrollX = mScrollX; 13625 final int scrollY = mScrollY; 13626 13627 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13628 dirty.right + scrollX, dirty.bottom + scrollY); 13629 } 13630 } 13631 13632 /** 13633 * Schedules an action on a drawable to occur at a specified time. 13634 * 13635 * @param who the recipient of the action 13636 * @param what the action to run on the drawable 13637 * @param when the time at which the action must occur. Uses the 13638 * {@link SystemClock#uptimeMillis} timebase. 13639 */ 13640 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13641 if (verifyDrawable(who) && what != null) { 13642 final long delay = when - SystemClock.uptimeMillis(); 13643 if (mAttachInfo != null) { 13644 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13645 Choreographer.CALLBACK_ANIMATION, what, who, 13646 Choreographer.subtractFrameDelay(delay)); 13647 } else { 13648 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13649 } 13650 } 13651 } 13652 13653 /** 13654 * Cancels a scheduled action on a drawable. 13655 * 13656 * @param who the recipient of the action 13657 * @param what the action to cancel 13658 */ 13659 public void unscheduleDrawable(Drawable who, Runnable what) { 13660 if (verifyDrawable(who) && what != null) { 13661 if (mAttachInfo != null) { 13662 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13663 Choreographer.CALLBACK_ANIMATION, what, who); 13664 } else { 13665 ViewRootImpl.getRunQueue().removeCallbacks(what); 13666 } 13667 } 13668 } 13669 13670 /** 13671 * Unschedule any events associated with the given Drawable. This can be 13672 * used when selecting a new Drawable into a view, so that the previous 13673 * one is completely unscheduled. 13674 * 13675 * @param who The Drawable to unschedule. 13676 * 13677 * @see #drawableStateChanged 13678 */ 13679 public void unscheduleDrawable(Drawable who) { 13680 if (mAttachInfo != null && who != null) { 13681 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13682 Choreographer.CALLBACK_ANIMATION, null, who); 13683 } 13684 } 13685 13686 /** 13687 * Return the layout direction of a given Drawable. 13688 * 13689 * @param who the Drawable to query 13690 */ 13691 public int getResolvedLayoutDirection(Drawable who) { 13692 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13693 } 13694 13695 /** 13696 * If your view subclass is displaying its own Drawable objects, it should 13697 * override this function and return true for any Drawable it is 13698 * displaying. This allows animations for those drawables to be 13699 * scheduled. 13700 * 13701 * <p>Be sure to call through to the super class when overriding this 13702 * function. 13703 * 13704 * @param who The Drawable to verify. Return true if it is one you are 13705 * displaying, else return the result of calling through to the 13706 * super class. 13707 * 13708 * @return boolean If true than the Drawable is being displayed in the 13709 * view; else false and it is not allowed to animate. 13710 * 13711 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13712 * @see #drawableStateChanged() 13713 */ 13714 protected boolean verifyDrawable(Drawable who) { 13715 return who == mBackground; 13716 } 13717 13718 /** 13719 * This function is called whenever the state of the view changes in such 13720 * a way that it impacts the state of drawables being shown. 13721 * 13722 * <p>Be sure to call through to the superclass when overriding this 13723 * function. 13724 * 13725 * @see Drawable#setState(int[]) 13726 */ 13727 protected void drawableStateChanged() { 13728 Drawable d = mBackground; 13729 if (d != null && d.isStateful()) { 13730 d.setState(getDrawableState()); 13731 } 13732 } 13733 13734 /** 13735 * Call this to force a view to update its drawable state. This will cause 13736 * drawableStateChanged to be called on this view. Views that are interested 13737 * in the new state should call getDrawableState. 13738 * 13739 * @see #drawableStateChanged 13740 * @see #getDrawableState 13741 */ 13742 public void refreshDrawableState() { 13743 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13744 drawableStateChanged(); 13745 13746 ViewParent parent = mParent; 13747 if (parent != null) { 13748 parent.childDrawableStateChanged(this); 13749 } 13750 } 13751 13752 /** 13753 * Return an array of resource IDs of the drawable states representing the 13754 * current state of the view. 13755 * 13756 * @return The current drawable state 13757 * 13758 * @see Drawable#setState(int[]) 13759 * @see #drawableStateChanged() 13760 * @see #onCreateDrawableState(int) 13761 */ 13762 public final int[] getDrawableState() { 13763 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13764 return mDrawableState; 13765 } else { 13766 mDrawableState = onCreateDrawableState(0); 13767 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13768 return mDrawableState; 13769 } 13770 } 13771 13772 /** 13773 * Generate the new {@link android.graphics.drawable.Drawable} state for 13774 * this view. This is called by the view 13775 * system when the cached Drawable state is determined to be invalid. To 13776 * retrieve the current state, you should use {@link #getDrawableState}. 13777 * 13778 * @param extraSpace if non-zero, this is the number of extra entries you 13779 * would like in the returned array in which you can place your own 13780 * states. 13781 * 13782 * @return Returns an array holding the current {@link Drawable} state of 13783 * the view. 13784 * 13785 * @see #mergeDrawableStates(int[], int[]) 13786 */ 13787 protected int[] onCreateDrawableState(int extraSpace) { 13788 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13789 mParent instanceof View) { 13790 return ((View) mParent).onCreateDrawableState(extraSpace); 13791 } 13792 13793 int[] drawableState; 13794 13795 int privateFlags = mPrivateFlags; 13796 13797 int viewStateIndex = 0; 13798 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13799 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13800 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13801 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13802 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13803 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13804 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13805 HardwareRenderer.isAvailable()) { 13806 // This is set if HW acceleration is requested, even if the current 13807 // process doesn't allow it. This is just to allow app preview 13808 // windows to better match their app. 13809 viewStateIndex |= VIEW_STATE_ACCELERATED; 13810 } 13811 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13812 13813 final int privateFlags2 = mPrivateFlags2; 13814 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13815 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13816 13817 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13818 13819 //noinspection ConstantIfStatement 13820 if (false) { 13821 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13822 Log.i("View", toString() 13823 + " pressed=" + ((privateFlags & PRESSED) != 0) 13824 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13825 + " fo=" + hasFocus() 13826 + " sl=" + ((privateFlags & SELECTED) != 0) 13827 + " wf=" + hasWindowFocus() 13828 + ": " + Arrays.toString(drawableState)); 13829 } 13830 13831 if (extraSpace == 0) { 13832 return drawableState; 13833 } 13834 13835 final int[] fullState; 13836 if (drawableState != null) { 13837 fullState = new int[drawableState.length + extraSpace]; 13838 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13839 } else { 13840 fullState = new int[extraSpace]; 13841 } 13842 13843 return fullState; 13844 } 13845 13846 /** 13847 * Merge your own state values in <var>additionalState</var> into the base 13848 * state values <var>baseState</var> that were returned by 13849 * {@link #onCreateDrawableState(int)}. 13850 * 13851 * @param baseState The base state values returned by 13852 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13853 * own additional state values. 13854 * 13855 * @param additionalState The additional state values you would like 13856 * added to <var>baseState</var>; this array is not modified. 13857 * 13858 * @return As a convenience, the <var>baseState</var> array you originally 13859 * passed into the function is returned. 13860 * 13861 * @see #onCreateDrawableState(int) 13862 */ 13863 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13864 final int N = baseState.length; 13865 int i = N - 1; 13866 while (i >= 0 && baseState[i] == 0) { 13867 i--; 13868 } 13869 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13870 return baseState; 13871 } 13872 13873 /** 13874 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13875 * on all Drawable objects associated with this view. 13876 */ 13877 public void jumpDrawablesToCurrentState() { 13878 if (mBackground != null) { 13879 mBackground.jumpToCurrentState(); 13880 } 13881 } 13882 13883 /** 13884 * Sets the background color for this view. 13885 * @param color the color of the background 13886 */ 13887 @RemotableViewMethod 13888 public void setBackgroundColor(int color) { 13889 if (mBackground instanceof ColorDrawable) { 13890 ((ColorDrawable) mBackground).setColor(color); 13891 } else { 13892 setBackground(new ColorDrawable(color)); 13893 } 13894 } 13895 13896 /** 13897 * Set the background to a given resource. The resource should refer to 13898 * a Drawable object or 0 to remove the background. 13899 * @param resid The identifier of the resource. 13900 * 13901 * @attr ref android.R.styleable#View_background 13902 */ 13903 @RemotableViewMethod 13904 public void setBackgroundResource(int resid) { 13905 if (resid != 0 && resid == mBackgroundResource) { 13906 return; 13907 } 13908 13909 Drawable d= null; 13910 if (resid != 0) { 13911 d = mResources.getDrawable(resid); 13912 } 13913 setBackground(d); 13914 13915 mBackgroundResource = resid; 13916 } 13917 13918 /** 13919 * Set the background to a given Drawable, or remove the background. If the 13920 * background has padding, this View's padding is set to the background's 13921 * padding. However, when a background is removed, this View's padding isn't 13922 * touched. If setting the padding is desired, please use 13923 * {@link #setPadding(int, int, int, int)}. 13924 * 13925 * @param background The Drawable to use as the background, or null to remove the 13926 * background 13927 */ 13928 public void setBackground(Drawable background) { 13929 //noinspection deprecation 13930 setBackgroundDrawable(background); 13931 } 13932 13933 /** 13934 * @deprecated use {@link #setBackground(Drawable)} instead 13935 */ 13936 @Deprecated 13937 public void setBackgroundDrawable(Drawable background) { 13938 if (background == mBackground) { 13939 return; 13940 } 13941 13942 boolean requestLayout = false; 13943 13944 mBackgroundResource = 0; 13945 13946 /* 13947 * Regardless of whether we're setting a new background or not, we want 13948 * to clear the previous drawable. 13949 */ 13950 if (mBackground != null) { 13951 mBackground.setCallback(null); 13952 unscheduleDrawable(mBackground); 13953 } 13954 13955 if (background != null) { 13956 Rect padding = sThreadLocal.get(); 13957 if (padding == null) { 13958 padding = new Rect(); 13959 sThreadLocal.set(padding); 13960 } 13961 if (background.getPadding(padding)) { 13962 switch (background.getResolvedLayoutDirectionSelf()) { 13963 case LAYOUT_DIRECTION_RTL: 13964 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13965 break; 13966 case LAYOUT_DIRECTION_LTR: 13967 default: 13968 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13969 } 13970 } 13971 13972 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13973 // if it has a different minimum size, we should layout again 13974 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13975 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13976 requestLayout = true; 13977 } 13978 13979 background.setCallback(this); 13980 if (background.isStateful()) { 13981 background.setState(getDrawableState()); 13982 } 13983 background.setVisible(getVisibility() == VISIBLE, false); 13984 mBackground = background; 13985 13986 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13987 mPrivateFlags &= ~SKIP_DRAW; 13988 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13989 requestLayout = true; 13990 } 13991 } else { 13992 /* Remove the background */ 13993 mBackground = null; 13994 13995 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13996 /* 13997 * This view ONLY drew the background before and we're removing 13998 * the background, so now it won't draw anything 13999 * (hence we SKIP_DRAW) 14000 */ 14001 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14002 mPrivateFlags |= SKIP_DRAW; 14003 } 14004 14005 /* 14006 * When the background is set, we try to apply its padding to this 14007 * View. When the background is removed, we don't touch this View's 14008 * padding. This is noted in the Javadocs. Hence, we don't need to 14009 * requestLayout(), the invalidate() below is sufficient. 14010 */ 14011 14012 // The old background's minimum size could have affected this 14013 // View's layout, so let's requestLayout 14014 requestLayout = true; 14015 } 14016 14017 computeOpaqueFlags(); 14018 14019 if (requestLayout) { 14020 requestLayout(); 14021 } 14022 14023 mBackgroundSizeChanged = true; 14024 invalidate(true); 14025 } 14026 14027 /** 14028 * Gets the background drawable 14029 * 14030 * @return The drawable used as the background for this view, if any. 14031 * 14032 * @see #setBackground(Drawable) 14033 * 14034 * @attr ref android.R.styleable#View_background 14035 */ 14036 public Drawable getBackground() { 14037 return mBackground; 14038 } 14039 14040 /** 14041 * Sets the padding. The view may add on the space required to display 14042 * the scrollbars, depending on the style and visibility of the scrollbars. 14043 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14044 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14045 * from the values set in this call. 14046 * 14047 * @attr ref android.R.styleable#View_padding 14048 * @attr ref android.R.styleable#View_paddingBottom 14049 * @attr ref android.R.styleable#View_paddingLeft 14050 * @attr ref android.R.styleable#View_paddingRight 14051 * @attr ref android.R.styleable#View_paddingTop 14052 * @param left the left padding in pixels 14053 * @param top the top padding in pixels 14054 * @param right the right padding in pixels 14055 * @param bottom the bottom padding in pixels 14056 */ 14057 public void setPadding(int left, int top, int right, int bottom) { 14058 mUserPaddingStart = -1; 14059 mUserPaddingEnd = -1; 14060 mUserPaddingRelative = false; 14061 14062 internalSetPadding(left, top, right, bottom); 14063 } 14064 14065 private void internalSetPadding(int left, int top, int right, int bottom) { 14066 mUserPaddingLeft = left; 14067 mUserPaddingRight = right; 14068 mUserPaddingBottom = bottom; 14069 14070 final int viewFlags = mViewFlags; 14071 boolean changed = false; 14072 14073 // Common case is there are no scroll bars. 14074 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14075 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14076 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14077 ? 0 : getVerticalScrollbarWidth(); 14078 switch (mVerticalScrollbarPosition) { 14079 case SCROLLBAR_POSITION_DEFAULT: 14080 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14081 left += offset; 14082 } else { 14083 right += offset; 14084 } 14085 break; 14086 case SCROLLBAR_POSITION_RIGHT: 14087 right += offset; 14088 break; 14089 case SCROLLBAR_POSITION_LEFT: 14090 left += offset; 14091 break; 14092 } 14093 } 14094 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14095 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14096 ? 0 : getHorizontalScrollbarHeight(); 14097 } 14098 } 14099 14100 if (mPaddingLeft != left) { 14101 changed = true; 14102 mPaddingLeft = left; 14103 } 14104 if (mPaddingTop != top) { 14105 changed = true; 14106 mPaddingTop = top; 14107 } 14108 if (mPaddingRight != right) { 14109 changed = true; 14110 mPaddingRight = right; 14111 } 14112 if (mPaddingBottom != bottom) { 14113 changed = true; 14114 mPaddingBottom = bottom; 14115 } 14116 14117 if (changed) { 14118 requestLayout(); 14119 } 14120 } 14121 14122 /** 14123 * Sets the relative padding. The view may add on the space required to display 14124 * the scrollbars, depending on the style and visibility of the scrollbars. 14125 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14126 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14127 * from the values set in this call. 14128 * 14129 * @attr ref android.R.styleable#View_padding 14130 * @attr ref android.R.styleable#View_paddingBottom 14131 * @attr ref android.R.styleable#View_paddingStart 14132 * @attr ref android.R.styleable#View_paddingEnd 14133 * @attr ref android.R.styleable#View_paddingTop 14134 * @param start the start padding in pixels 14135 * @param top the top padding in pixels 14136 * @param end the end padding in pixels 14137 * @param bottom the bottom padding in pixels 14138 */ 14139 public void setPaddingRelative(int start, int top, int end, int bottom) { 14140 mUserPaddingStart = start; 14141 mUserPaddingEnd = end; 14142 mUserPaddingRelative = true; 14143 14144 switch(getResolvedLayoutDirection()) { 14145 case LAYOUT_DIRECTION_RTL: 14146 internalSetPadding(end, top, start, bottom); 14147 break; 14148 case LAYOUT_DIRECTION_LTR: 14149 default: 14150 internalSetPadding(start, top, end, bottom); 14151 } 14152 } 14153 14154 /** 14155 * Returns the top padding of this view. 14156 * 14157 * @return the top padding in pixels 14158 */ 14159 public int getPaddingTop() { 14160 return mPaddingTop; 14161 } 14162 14163 /** 14164 * Returns the bottom padding of this view. If there are inset and enabled 14165 * scrollbars, this value may include the space required to display the 14166 * scrollbars as well. 14167 * 14168 * @return the bottom padding in pixels 14169 */ 14170 public int getPaddingBottom() { 14171 return mPaddingBottom; 14172 } 14173 14174 /** 14175 * Returns the left padding of this view. If there are inset and enabled 14176 * scrollbars, this value may include the space required to display the 14177 * scrollbars as well. 14178 * 14179 * @return the left padding in pixels 14180 */ 14181 public int getPaddingLeft() { 14182 return mPaddingLeft; 14183 } 14184 14185 /** 14186 * Returns the start padding of this view depending on its resolved layout direction. 14187 * If there are inset and enabled scrollbars, this value may include the space 14188 * required to display the scrollbars as well. 14189 * 14190 * @return the start padding in pixels 14191 */ 14192 public int getPaddingStart() { 14193 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14194 mPaddingRight : mPaddingLeft; 14195 } 14196 14197 /** 14198 * Returns the right padding of this view. If there are inset and enabled 14199 * scrollbars, this value may include the space required to display the 14200 * scrollbars as well. 14201 * 14202 * @return the right padding in pixels 14203 */ 14204 public int getPaddingRight() { 14205 return mPaddingRight; 14206 } 14207 14208 /** 14209 * Returns the end padding of this view depending on its resolved layout direction. 14210 * If there are inset and enabled scrollbars, this value may include the space 14211 * required to display the scrollbars as well. 14212 * 14213 * @return the end padding in pixels 14214 */ 14215 public int getPaddingEnd() { 14216 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14217 mPaddingLeft : mPaddingRight; 14218 } 14219 14220 /** 14221 * Return if the padding as been set thru relative values 14222 * {@link #setPaddingRelative(int, int, int, int)} or thru 14223 * @attr ref android.R.styleable#View_paddingStart or 14224 * @attr ref android.R.styleable#View_paddingEnd 14225 * 14226 * @return true if the padding is relative or false if it is not. 14227 */ 14228 public boolean isPaddingRelative() { 14229 return mUserPaddingRelative; 14230 } 14231 14232 /** 14233 * @hide 14234 */ 14235 public Insets getOpticalInsets() { 14236 if (mLayoutInsets == null) { 14237 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14238 } 14239 return mLayoutInsets; 14240 } 14241 14242 /** 14243 * @hide 14244 */ 14245 public void setLayoutInsets(Insets layoutInsets) { 14246 mLayoutInsets = layoutInsets; 14247 } 14248 14249 /** 14250 * Changes the selection state of this view. A view can be selected or not. 14251 * Note that selection is not the same as focus. Views are typically 14252 * selected in the context of an AdapterView like ListView or GridView; 14253 * the selected view is the view that is highlighted. 14254 * 14255 * @param selected true if the view must be selected, false otherwise 14256 */ 14257 public void setSelected(boolean selected) { 14258 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14259 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14260 if (!selected) resetPressedState(); 14261 invalidate(true); 14262 refreshDrawableState(); 14263 dispatchSetSelected(selected); 14264 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14265 notifyAccessibilityStateChanged(); 14266 } 14267 } 14268 } 14269 14270 /** 14271 * Dispatch setSelected to all of this View's children. 14272 * 14273 * @see #setSelected(boolean) 14274 * 14275 * @param selected The new selected state 14276 */ 14277 protected void dispatchSetSelected(boolean selected) { 14278 } 14279 14280 /** 14281 * Indicates the selection state of this view. 14282 * 14283 * @return true if the view is selected, false otherwise 14284 */ 14285 @ViewDebug.ExportedProperty 14286 public boolean isSelected() { 14287 return (mPrivateFlags & SELECTED) != 0; 14288 } 14289 14290 /** 14291 * Changes the activated state of this view. A view can be activated or not. 14292 * Note that activation is not the same as selection. Selection is 14293 * a transient property, representing the view (hierarchy) the user is 14294 * currently interacting with. Activation is a longer-term state that the 14295 * user can move views in and out of. For example, in a list view with 14296 * single or multiple selection enabled, the views in the current selection 14297 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14298 * here.) The activated state is propagated down to children of the view it 14299 * is set on. 14300 * 14301 * @param activated true if the view must be activated, false otherwise 14302 */ 14303 public void setActivated(boolean activated) { 14304 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14305 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14306 invalidate(true); 14307 refreshDrawableState(); 14308 dispatchSetActivated(activated); 14309 } 14310 } 14311 14312 /** 14313 * Dispatch setActivated to all of this View's children. 14314 * 14315 * @see #setActivated(boolean) 14316 * 14317 * @param activated The new activated state 14318 */ 14319 protected void dispatchSetActivated(boolean activated) { 14320 } 14321 14322 /** 14323 * Indicates the activation state of this view. 14324 * 14325 * @return true if the view is activated, false otherwise 14326 */ 14327 @ViewDebug.ExportedProperty 14328 public boolean isActivated() { 14329 return (mPrivateFlags & ACTIVATED) != 0; 14330 } 14331 14332 /** 14333 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14334 * observer can be used to get notifications when global events, like 14335 * layout, happen. 14336 * 14337 * The returned ViewTreeObserver observer is not guaranteed to remain 14338 * valid for the lifetime of this View. If the caller of this method keeps 14339 * a long-lived reference to ViewTreeObserver, it should always check for 14340 * the return value of {@link ViewTreeObserver#isAlive()}. 14341 * 14342 * @return The ViewTreeObserver for this view's hierarchy. 14343 */ 14344 public ViewTreeObserver getViewTreeObserver() { 14345 if (mAttachInfo != null) { 14346 return mAttachInfo.mTreeObserver; 14347 } 14348 if (mFloatingTreeObserver == null) { 14349 mFloatingTreeObserver = new ViewTreeObserver(); 14350 } 14351 return mFloatingTreeObserver; 14352 } 14353 14354 /** 14355 * <p>Finds the topmost view in the current view hierarchy.</p> 14356 * 14357 * @return the topmost view containing this view 14358 */ 14359 public View getRootView() { 14360 if (mAttachInfo != null) { 14361 final View v = mAttachInfo.mRootView; 14362 if (v != null) { 14363 return v; 14364 } 14365 } 14366 14367 View parent = this; 14368 14369 while (parent.mParent != null && parent.mParent instanceof View) { 14370 parent = (View) parent.mParent; 14371 } 14372 14373 return parent; 14374 } 14375 14376 /** 14377 * <p>Computes the coordinates of this view on the screen. The argument 14378 * must be an array of two integers. After the method returns, the array 14379 * contains the x and y location in that order.</p> 14380 * 14381 * @param location an array of two integers in which to hold the coordinates 14382 */ 14383 public void getLocationOnScreen(int[] location) { 14384 getLocationInWindow(location); 14385 14386 final AttachInfo info = mAttachInfo; 14387 if (info != null) { 14388 location[0] += info.mWindowLeft; 14389 location[1] += info.mWindowTop; 14390 } 14391 } 14392 14393 /** 14394 * <p>Computes the coordinates of this view in its window. The argument 14395 * must be an array of two integers. After the method returns, the array 14396 * contains the x and y location in that order.</p> 14397 * 14398 * @param location an array of two integers in which to hold the coordinates 14399 */ 14400 public void getLocationInWindow(int[] location) { 14401 if (location == null || location.length < 2) { 14402 throw new IllegalArgumentException("location must be an array of two integers"); 14403 } 14404 14405 if (mAttachInfo == null) { 14406 // When the view is not attached to a window, this method does not make sense 14407 location[0] = location[1] = 0; 14408 return; 14409 } 14410 14411 float[] position = mAttachInfo.mTmpTransformLocation; 14412 position[0] = position[1] = 0.0f; 14413 14414 if (!hasIdentityMatrix()) { 14415 getMatrix().mapPoints(position); 14416 } 14417 14418 position[0] += mLeft; 14419 position[1] += mTop; 14420 14421 ViewParent viewParent = mParent; 14422 while (viewParent instanceof View) { 14423 final View view = (View) viewParent; 14424 14425 position[0] -= view.mScrollX; 14426 position[1] -= view.mScrollY; 14427 14428 if (!view.hasIdentityMatrix()) { 14429 view.getMatrix().mapPoints(position); 14430 } 14431 14432 position[0] += view.mLeft; 14433 position[1] += view.mTop; 14434 14435 viewParent = view.mParent; 14436 } 14437 14438 if (viewParent instanceof ViewRootImpl) { 14439 // *cough* 14440 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14441 position[1] -= vr.mCurScrollY; 14442 } 14443 14444 location[0] = (int) (position[0] + 0.5f); 14445 location[1] = (int) (position[1] + 0.5f); 14446 } 14447 14448 /** 14449 * {@hide} 14450 * @param id the id of the view to be found 14451 * @return the view of the specified id, null if cannot be found 14452 */ 14453 protected View findViewTraversal(int id) { 14454 if (id == mID) { 14455 return this; 14456 } 14457 return null; 14458 } 14459 14460 /** 14461 * {@hide} 14462 * @param tag the tag of the view to be found 14463 * @return the view of specified tag, null if cannot be found 14464 */ 14465 protected View findViewWithTagTraversal(Object tag) { 14466 if (tag != null && tag.equals(mTag)) { 14467 return this; 14468 } 14469 return null; 14470 } 14471 14472 /** 14473 * {@hide} 14474 * @param predicate The predicate to evaluate. 14475 * @param childToSkip If not null, ignores this child during the recursive traversal. 14476 * @return The first view that matches the predicate or null. 14477 */ 14478 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14479 if (predicate.apply(this)) { 14480 return this; 14481 } 14482 return null; 14483 } 14484 14485 /** 14486 * Look for a child view with the given id. If this view has the given 14487 * id, return this view. 14488 * 14489 * @param id The id to search for. 14490 * @return The view that has the given id in the hierarchy or null 14491 */ 14492 public final View findViewById(int id) { 14493 if (id < 0) { 14494 return null; 14495 } 14496 return findViewTraversal(id); 14497 } 14498 14499 /** 14500 * Finds a view by its unuque and stable accessibility id. 14501 * 14502 * @param accessibilityId The searched accessibility id. 14503 * @return The found view. 14504 */ 14505 final View findViewByAccessibilityId(int accessibilityId) { 14506 if (accessibilityId < 0) { 14507 return null; 14508 } 14509 return findViewByAccessibilityIdTraversal(accessibilityId); 14510 } 14511 14512 /** 14513 * Performs the traversal to find a view by its unuque and stable accessibility id. 14514 * 14515 * <strong>Note:</strong>This method does not stop at the root namespace 14516 * boundary since the user can touch the screen at an arbitrary location 14517 * potentially crossing the root namespace bounday which will send an 14518 * accessibility event to accessibility services and they should be able 14519 * to obtain the event source. Also accessibility ids are guaranteed to be 14520 * unique in the window. 14521 * 14522 * @param accessibilityId The accessibility id. 14523 * @return The found view. 14524 */ 14525 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14526 if (getAccessibilityViewId() == accessibilityId) { 14527 return this; 14528 } 14529 return null; 14530 } 14531 14532 /** 14533 * Look for a child view with the given tag. If this view has the given 14534 * tag, return this view. 14535 * 14536 * @param tag The tag to search for, using "tag.equals(getTag())". 14537 * @return The View that has the given tag in the hierarchy or null 14538 */ 14539 public final View findViewWithTag(Object tag) { 14540 if (tag == null) { 14541 return null; 14542 } 14543 return findViewWithTagTraversal(tag); 14544 } 14545 14546 /** 14547 * {@hide} 14548 * Look for a child view that matches the specified predicate. 14549 * If this view matches the predicate, return this view. 14550 * 14551 * @param predicate The predicate to evaluate. 14552 * @return The first view that matches the predicate or null. 14553 */ 14554 public final View findViewByPredicate(Predicate<View> predicate) { 14555 return findViewByPredicateTraversal(predicate, null); 14556 } 14557 14558 /** 14559 * {@hide} 14560 * Look for a child view that matches the specified predicate, 14561 * starting with the specified view and its descendents and then 14562 * recusively searching the ancestors and siblings of that view 14563 * until this view is reached. 14564 * 14565 * This method is useful in cases where the predicate does not match 14566 * a single unique view (perhaps multiple views use the same id) 14567 * and we are trying to find the view that is "closest" in scope to the 14568 * starting view. 14569 * 14570 * @param start The view to start from. 14571 * @param predicate The predicate to evaluate. 14572 * @return The first view that matches the predicate or null. 14573 */ 14574 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14575 View childToSkip = null; 14576 for (;;) { 14577 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14578 if (view != null || start == this) { 14579 return view; 14580 } 14581 14582 ViewParent parent = start.getParent(); 14583 if (parent == null || !(parent instanceof View)) { 14584 return null; 14585 } 14586 14587 childToSkip = start; 14588 start = (View) parent; 14589 } 14590 } 14591 14592 /** 14593 * Sets the identifier for this view. The identifier does not have to be 14594 * unique in this view's hierarchy. The identifier should be a positive 14595 * number. 14596 * 14597 * @see #NO_ID 14598 * @see #getId() 14599 * @see #findViewById(int) 14600 * 14601 * @param id a number used to identify the view 14602 * 14603 * @attr ref android.R.styleable#View_id 14604 */ 14605 public void setId(int id) { 14606 mID = id; 14607 } 14608 14609 /** 14610 * {@hide} 14611 * 14612 * @param isRoot true if the view belongs to the root namespace, false 14613 * otherwise 14614 */ 14615 public void setIsRootNamespace(boolean isRoot) { 14616 if (isRoot) { 14617 mPrivateFlags |= IS_ROOT_NAMESPACE; 14618 } else { 14619 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14620 } 14621 } 14622 14623 /** 14624 * {@hide} 14625 * 14626 * @return true if the view belongs to the root namespace, false otherwise 14627 */ 14628 public boolean isRootNamespace() { 14629 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14630 } 14631 14632 /** 14633 * Returns this view's identifier. 14634 * 14635 * @return a positive integer used to identify the view or {@link #NO_ID} 14636 * if the view has no ID 14637 * 14638 * @see #setId(int) 14639 * @see #findViewById(int) 14640 * @attr ref android.R.styleable#View_id 14641 */ 14642 @ViewDebug.CapturedViewProperty 14643 public int getId() { 14644 return mID; 14645 } 14646 14647 /** 14648 * Returns this view's tag. 14649 * 14650 * @return the Object stored in this view as a tag 14651 * 14652 * @see #setTag(Object) 14653 * @see #getTag(int) 14654 */ 14655 @ViewDebug.ExportedProperty 14656 public Object getTag() { 14657 return mTag; 14658 } 14659 14660 /** 14661 * Sets the tag associated with this view. A tag can be used to mark 14662 * a view in its hierarchy and does not have to be unique within the 14663 * hierarchy. Tags can also be used to store data within a view without 14664 * resorting to another data structure. 14665 * 14666 * @param tag an Object to tag the view with 14667 * 14668 * @see #getTag() 14669 * @see #setTag(int, Object) 14670 */ 14671 public void setTag(final Object tag) { 14672 mTag = tag; 14673 } 14674 14675 /** 14676 * Returns the tag associated with this view and the specified key. 14677 * 14678 * @param key The key identifying the tag 14679 * 14680 * @return the Object stored in this view as a tag 14681 * 14682 * @see #setTag(int, Object) 14683 * @see #getTag() 14684 */ 14685 public Object getTag(int key) { 14686 if (mKeyedTags != null) return mKeyedTags.get(key); 14687 return null; 14688 } 14689 14690 /** 14691 * Sets a tag associated with this view and a key. A tag can be used 14692 * to mark a view in its hierarchy and does not have to be unique within 14693 * the hierarchy. Tags can also be used to store data within a view 14694 * without resorting to another data structure. 14695 * 14696 * The specified key should be an id declared in the resources of the 14697 * application to ensure it is unique (see the <a 14698 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14699 * Keys identified as belonging to 14700 * the Android framework or not associated with any package will cause 14701 * an {@link IllegalArgumentException} to be thrown. 14702 * 14703 * @param key The key identifying the tag 14704 * @param tag An Object to tag the view with 14705 * 14706 * @throws IllegalArgumentException If they specified key is not valid 14707 * 14708 * @see #setTag(Object) 14709 * @see #getTag(int) 14710 */ 14711 public void setTag(int key, final Object tag) { 14712 // If the package id is 0x00 or 0x01, it's either an undefined package 14713 // or a framework id 14714 if ((key >>> 24) < 2) { 14715 throw new IllegalArgumentException("The key must be an application-specific " 14716 + "resource id."); 14717 } 14718 14719 setKeyedTag(key, tag); 14720 } 14721 14722 /** 14723 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14724 * framework id. 14725 * 14726 * @hide 14727 */ 14728 public void setTagInternal(int key, Object tag) { 14729 if ((key >>> 24) != 0x1) { 14730 throw new IllegalArgumentException("The key must be a framework-specific " 14731 + "resource id."); 14732 } 14733 14734 setKeyedTag(key, tag); 14735 } 14736 14737 private void setKeyedTag(int key, Object tag) { 14738 if (mKeyedTags == null) { 14739 mKeyedTags = new SparseArray<Object>(); 14740 } 14741 14742 mKeyedTags.put(key, tag); 14743 } 14744 14745 /** 14746 * @param consistency The type of consistency. See ViewDebug for more information. 14747 * 14748 * @hide 14749 */ 14750 protected boolean dispatchConsistencyCheck(int consistency) { 14751 return onConsistencyCheck(consistency); 14752 } 14753 14754 /** 14755 * Method that subclasses should implement to check their consistency. The type of 14756 * consistency check is indicated by the bit field passed as a parameter. 14757 * 14758 * @param consistency The type of consistency. See ViewDebug for more information. 14759 * 14760 * @throws IllegalStateException if the view is in an inconsistent state. 14761 * 14762 * @hide 14763 */ 14764 protected boolean onConsistencyCheck(int consistency) { 14765 boolean result = true; 14766 14767 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14768 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14769 14770 if (checkLayout) { 14771 if (getParent() == null) { 14772 result = false; 14773 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14774 "View " + this + " does not have a parent."); 14775 } 14776 14777 if (mAttachInfo == null) { 14778 result = false; 14779 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14780 "View " + this + " is not attached to a window."); 14781 } 14782 } 14783 14784 if (checkDrawing) { 14785 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14786 // from their draw() method 14787 14788 if ((mPrivateFlags & DRAWN) != DRAWN && 14789 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14790 result = false; 14791 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14792 "View " + this + " was invalidated but its drawing cache is valid."); 14793 } 14794 } 14795 14796 return result; 14797 } 14798 14799 /** 14800 * Prints information about this view in the log output, with the tag 14801 * {@link #VIEW_LOG_TAG}. 14802 * 14803 * @hide 14804 */ 14805 public void debug() { 14806 debug(0); 14807 } 14808 14809 /** 14810 * Prints information about this view in the log output, with the tag 14811 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14812 * indentation defined by the <code>depth</code>. 14813 * 14814 * @param depth the indentation level 14815 * 14816 * @hide 14817 */ 14818 protected void debug(int depth) { 14819 String output = debugIndent(depth - 1); 14820 14821 output += "+ " + this; 14822 int id = getId(); 14823 if (id != -1) { 14824 output += " (id=" + id + ")"; 14825 } 14826 Object tag = getTag(); 14827 if (tag != null) { 14828 output += " (tag=" + tag + ")"; 14829 } 14830 Log.d(VIEW_LOG_TAG, output); 14831 14832 if ((mPrivateFlags & FOCUSED) != 0) { 14833 output = debugIndent(depth) + " FOCUSED"; 14834 Log.d(VIEW_LOG_TAG, output); 14835 } 14836 14837 output = debugIndent(depth); 14838 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14839 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14840 + "} "; 14841 Log.d(VIEW_LOG_TAG, output); 14842 14843 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14844 || mPaddingBottom != 0) { 14845 output = debugIndent(depth); 14846 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14847 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14848 Log.d(VIEW_LOG_TAG, output); 14849 } 14850 14851 output = debugIndent(depth); 14852 output += "mMeasureWidth=" + mMeasuredWidth + 14853 " mMeasureHeight=" + mMeasuredHeight; 14854 Log.d(VIEW_LOG_TAG, output); 14855 14856 output = debugIndent(depth); 14857 if (mLayoutParams == null) { 14858 output += "BAD! no layout params"; 14859 } else { 14860 output = mLayoutParams.debug(output); 14861 } 14862 Log.d(VIEW_LOG_TAG, output); 14863 14864 output = debugIndent(depth); 14865 output += "flags={"; 14866 output += View.printFlags(mViewFlags); 14867 output += "}"; 14868 Log.d(VIEW_LOG_TAG, output); 14869 14870 output = debugIndent(depth); 14871 output += "privateFlags={"; 14872 output += View.printPrivateFlags(mPrivateFlags); 14873 output += "}"; 14874 Log.d(VIEW_LOG_TAG, output); 14875 } 14876 14877 /** 14878 * Creates a string of whitespaces used for indentation. 14879 * 14880 * @param depth the indentation level 14881 * @return a String containing (depth * 2 + 3) * 2 white spaces 14882 * 14883 * @hide 14884 */ 14885 protected static String debugIndent(int depth) { 14886 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14887 for (int i = 0; i < (depth * 2) + 3; i++) { 14888 spaces.append(' ').append(' '); 14889 } 14890 return spaces.toString(); 14891 } 14892 14893 /** 14894 * <p>Return the offset of the widget's text baseline from the widget's top 14895 * boundary. If this widget does not support baseline alignment, this 14896 * method returns -1. </p> 14897 * 14898 * @return the offset of the baseline within the widget's bounds or -1 14899 * if baseline alignment is not supported 14900 */ 14901 @ViewDebug.ExportedProperty(category = "layout") 14902 public int getBaseline() { 14903 return -1; 14904 } 14905 14906 /** 14907 * Call this when something has changed which has invalidated the 14908 * layout of this view. This will schedule a layout pass of the view 14909 * tree. 14910 */ 14911 public void requestLayout() { 14912 if (ViewDebug.TRACE_HIERARCHY) { 14913 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14914 } 14915 14916 mPrivateFlags |= FORCE_LAYOUT; 14917 mPrivateFlags |= INVALIDATED; 14918 14919 if (mLayoutParams != null) { 14920 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14921 } 14922 14923 if (mParent != null && !mParent.isLayoutRequested()) { 14924 mParent.requestLayout(); 14925 } 14926 } 14927 14928 /** 14929 * Forces this view to be laid out during the next layout pass. 14930 * This method does not call requestLayout() or forceLayout() 14931 * on the parent. 14932 */ 14933 public void forceLayout() { 14934 mPrivateFlags |= FORCE_LAYOUT; 14935 mPrivateFlags |= INVALIDATED; 14936 } 14937 14938 /** 14939 * <p> 14940 * This is called to find out how big a view should be. The parent 14941 * supplies constraint information in the width and height parameters. 14942 * </p> 14943 * 14944 * <p> 14945 * The actual measurement work of a view is performed in 14946 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14947 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14948 * </p> 14949 * 14950 * 14951 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14952 * parent 14953 * @param heightMeasureSpec Vertical space requirements as imposed by the 14954 * parent 14955 * 14956 * @see #onMeasure(int, int) 14957 */ 14958 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14959 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14960 widthMeasureSpec != mOldWidthMeasureSpec || 14961 heightMeasureSpec != mOldHeightMeasureSpec) { 14962 14963 // first clears the measured dimension flag 14964 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14965 14966 if (ViewDebug.TRACE_HIERARCHY) { 14967 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14968 } 14969 14970 // measure ourselves, this should set the measured dimension flag back 14971 onMeasure(widthMeasureSpec, heightMeasureSpec); 14972 14973 // flag not set, setMeasuredDimension() was not invoked, we raise 14974 // an exception to warn the developer 14975 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14976 throw new IllegalStateException("onMeasure() did not set the" 14977 + " measured dimension by calling" 14978 + " setMeasuredDimension()"); 14979 } 14980 14981 mPrivateFlags |= LAYOUT_REQUIRED; 14982 } 14983 14984 mOldWidthMeasureSpec = widthMeasureSpec; 14985 mOldHeightMeasureSpec = heightMeasureSpec; 14986 } 14987 14988 /** 14989 * <p> 14990 * Measure the view and its content to determine the measured width and the 14991 * measured height. This method is invoked by {@link #measure(int, int)} and 14992 * should be overriden by subclasses to provide accurate and efficient 14993 * measurement of their contents. 14994 * </p> 14995 * 14996 * <p> 14997 * <strong>CONTRACT:</strong> When overriding this method, you 14998 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14999 * measured width and height of this view. Failure to do so will trigger an 15000 * <code>IllegalStateException</code>, thrown by 15001 * {@link #measure(int, int)}. Calling the superclass' 15002 * {@link #onMeasure(int, int)} is a valid use. 15003 * </p> 15004 * 15005 * <p> 15006 * The base class implementation of measure defaults to the background size, 15007 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15008 * override {@link #onMeasure(int, int)} to provide better measurements of 15009 * their content. 15010 * </p> 15011 * 15012 * <p> 15013 * If this method is overridden, it is the subclass's responsibility to make 15014 * sure the measured height and width are at least the view's minimum height 15015 * and width ({@link #getSuggestedMinimumHeight()} and 15016 * {@link #getSuggestedMinimumWidth()}). 15017 * </p> 15018 * 15019 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15020 * The requirements are encoded with 15021 * {@link android.view.View.MeasureSpec}. 15022 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15023 * The requirements are encoded with 15024 * {@link android.view.View.MeasureSpec}. 15025 * 15026 * @see #getMeasuredWidth() 15027 * @see #getMeasuredHeight() 15028 * @see #setMeasuredDimension(int, int) 15029 * @see #getSuggestedMinimumHeight() 15030 * @see #getSuggestedMinimumWidth() 15031 * @see android.view.View.MeasureSpec#getMode(int) 15032 * @see android.view.View.MeasureSpec#getSize(int) 15033 */ 15034 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15035 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15036 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15037 } 15038 15039 /** 15040 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15041 * measured width and measured height. Failing to do so will trigger an 15042 * exception at measurement time.</p> 15043 * 15044 * @param measuredWidth The measured width of this view. May be a complex 15045 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15046 * {@link #MEASURED_STATE_TOO_SMALL}. 15047 * @param measuredHeight The measured height of this view. May be a complex 15048 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15049 * {@link #MEASURED_STATE_TOO_SMALL}. 15050 */ 15051 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15052 mMeasuredWidth = measuredWidth; 15053 mMeasuredHeight = measuredHeight; 15054 15055 mPrivateFlags |= MEASURED_DIMENSION_SET; 15056 } 15057 15058 /** 15059 * Merge two states as returned by {@link #getMeasuredState()}. 15060 * @param curState The current state as returned from a view or the result 15061 * of combining multiple views. 15062 * @param newState The new view state to combine. 15063 * @return Returns a new integer reflecting the combination of the two 15064 * states. 15065 */ 15066 public static int combineMeasuredStates(int curState, int newState) { 15067 return curState | newState; 15068 } 15069 15070 /** 15071 * Version of {@link #resolveSizeAndState(int, int, int)} 15072 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15073 */ 15074 public static int resolveSize(int size, int measureSpec) { 15075 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15076 } 15077 15078 /** 15079 * Utility to reconcile a desired size and state, with constraints imposed 15080 * by a MeasureSpec. Will take the desired size, unless a different size 15081 * is imposed by the constraints. The returned value is a compound integer, 15082 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15083 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15084 * size is smaller than the size the view wants to be. 15085 * 15086 * @param size How big the view wants to be 15087 * @param measureSpec Constraints imposed by the parent 15088 * @return Size information bit mask as defined by 15089 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15090 */ 15091 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15092 int result = size; 15093 int specMode = MeasureSpec.getMode(measureSpec); 15094 int specSize = MeasureSpec.getSize(measureSpec); 15095 switch (specMode) { 15096 case MeasureSpec.UNSPECIFIED: 15097 result = size; 15098 break; 15099 case MeasureSpec.AT_MOST: 15100 if (specSize < size) { 15101 result = specSize | MEASURED_STATE_TOO_SMALL; 15102 } else { 15103 result = size; 15104 } 15105 break; 15106 case MeasureSpec.EXACTLY: 15107 result = specSize; 15108 break; 15109 } 15110 return result | (childMeasuredState&MEASURED_STATE_MASK); 15111 } 15112 15113 /** 15114 * Utility to return a default size. Uses the supplied size if the 15115 * MeasureSpec imposed no constraints. Will get larger if allowed 15116 * by the MeasureSpec. 15117 * 15118 * @param size Default size for this view 15119 * @param measureSpec Constraints imposed by the parent 15120 * @return The size this view should be. 15121 */ 15122 public static int getDefaultSize(int size, int measureSpec) { 15123 int result = size; 15124 int specMode = MeasureSpec.getMode(measureSpec); 15125 int specSize = MeasureSpec.getSize(measureSpec); 15126 15127 switch (specMode) { 15128 case MeasureSpec.UNSPECIFIED: 15129 result = size; 15130 break; 15131 case MeasureSpec.AT_MOST: 15132 case MeasureSpec.EXACTLY: 15133 result = specSize; 15134 break; 15135 } 15136 return result; 15137 } 15138 15139 /** 15140 * Returns the suggested minimum height that the view should use. This 15141 * returns the maximum of the view's minimum height 15142 * and the background's minimum height 15143 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15144 * <p> 15145 * When being used in {@link #onMeasure(int, int)}, the caller should still 15146 * ensure the returned height is within the requirements of the parent. 15147 * 15148 * @return The suggested minimum height of the view. 15149 */ 15150 protected int getSuggestedMinimumHeight() { 15151 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15152 15153 } 15154 15155 /** 15156 * Returns the suggested minimum width that the view should use. This 15157 * returns the maximum of the view's minimum width) 15158 * and the background's minimum width 15159 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15160 * <p> 15161 * When being used in {@link #onMeasure(int, int)}, the caller should still 15162 * ensure the returned width is within the requirements of the parent. 15163 * 15164 * @return The suggested minimum width of the view. 15165 */ 15166 protected int getSuggestedMinimumWidth() { 15167 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15168 } 15169 15170 /** 15171 * Returns the minimum height of the view. 15172 * 15173 * @return the minimum height the view will try to be. 15174 * 15175 * @see #setMinimumHeight(int) 15176 * 15177 * @attr ref android.R.styleable#View_minHeight 15178 */ 15179 public int getMinimumHeight() { 15180 return mMinHeight; 15181 } 15182 15183 /** 15184 * Sets the minimum height of the view. It is not guaranteed the view will 15185 * be able to achieve this minimum height (for example, if its parent layout 15186 * constrains it with less available height). 15187 * 15188 * @param minHeight The minimum height the view will try to be. 15189 * 15190 * @see #getMinimumHeight() 15191 * 15192 * @attr ref android.R.styleable#View_minHeight 15193 */ 15194 public void setMinimumHeight(int minHeight) { 15195 mMinHeight = minHeight; 15196 requestLayout(); 15197 } 15198 15199 /** 15200 * Returns the minimum width of the view. 15201 * 15202 * @return the minimum width the view will try to be. 15203 * 15204 * @see #setMinimumWidth(int) 15205 * 15206 * @attr ref android.R.styleable#View_minWidth 15207 */ 15208 public int getMinimumWidth() { 15209 return mMinWidth; 15210 } 15211 15212 /** 15213 * Sets the minimum width of the view. It is not guaranteed the view will 15214 * be able to achieve this minimum width (for example, if its parent layout 15215 * constrains it with less available width). 15216 * 15217 * @param minWidth The minimum width the view will try to be. 15218 * 15219 * @see #getMinimumWidth() 15220 * 15221 * @attr ref android.R.styleable#View_minWidth 15222 */ 15223 public void setMinimumWidth(int minWidth) { 15224 mMinWidth = minWidth; 15225 requestLayout(); 15226 15227 } 15228 15229 /** 15230 * Get the animation currently associated with this view. 15231 * 15232 * @return The animation that is currently playing or 15233 * scheduled to play for this view. 15234 */ 15235 public Animation getAnimation() { 15236 return mCurrentAnimation; 15237 } 15238 15239 /** 15240 * Start the specified animation now. 15241 * 15242 * @param animation the animation to start now 15243 */ 15244 public void startAnimation(Animation animation) { 15245 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15246 setAnimation(animation); 15247 invalidateParentCaches(); 15248 invalidate(true); 15249 } 15250 15251 /** 15252 * Cancels any animations for this view. 15253 */ 15254 public void clearAnimation() { 15255 if (mCurrentAnimation != null) { 15256 mCurrentAnimation.detach(); 15257 } 15258 mCurrentAnimation = null; 15259 invalidateParentIfNeeded(); 15260 } 15261 15262 /** 15263 * Sets the next animation to play for this view. 15264 * If you want the animation to play immediately, use 15265 * {@link #startAnimation(android.view.animation.Animation)} instead. 15266 * This method provides allows fine-grained 15267 * control over the start time and invalidation, but you 15268 * must make sure that 1) the animation has a start time set, and 15269 * 2) the view's parent (which controls animations on its children) 15270 * will be invalidated when the animation is supposed to 15271 * start. 15272 * 15273 * @param animation The next animation, or null. 15274 */ 15275 public void setAnimation(Animation animation) { 15276 mCurrentAnimation = animation; 15277 15278 if (animation != null) { 15279 // If the screen is off assume the animation start time is now instead of 15280 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15281 // would cause the animation to start when the screen turns back on 15282 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15283 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15284 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15285 } 15286 animation.reset(); 15287 } 15288 } 15289 15290 /** 15291 * Invoked by a parent ViewGroup to notify the start of the animation 15292 * currently associated with this view. If you override this method, 15293 * always call super.onAnimationStart(); 15294 * 15295 * @see #setAnimation(android.view.animation.Animation) 15296 * @see #getAnimation() 15297 */ 15298 protected void onAnimationStart() { 15299 mPrivateFlags |= ANIMATION_STARTED; 15300 } 15301 15302 /** 15303 * Invoked by a parent ViewGroup to notify the end of the animation 15304 * currently associated with this view. If you override this method, 15305 * always call super.onAnimationEnd(); 15306 * 15307 * @see #setAnimation(android.view.animation.Animation) 15308 * @see #getAnimation() 15309 */ 15310 protected void onAnimationEnd() { 15311 mPrivateFlags &= ~ANIMATION_STARTED; 15312 } 15313 15314 /** 15315 * Invoked if there is a Transform that involves alpha. Subclass that can 15316 * draw themselves with the specified alpha should return true, and then 15317 * respect that alpha when their onDraw() is called. If this returns false 15318 * then the view may be redirected to draw into an offscreen buffer to 15319 * fulfill the request, which will look fine, but may be slower than if the 15320 * subclass handles it internally. The default implementation returns false. 15321 * 15322 * @param alpha The alpha (0..255) to apply to the view's drawing 15323 * @return true if the view can draw with the specified alpha. 15324 */ 15325 protected boolean onSetAlpha(int alpha) { 15326 return false; 15327 } 15328 15329 /** 15330 * This is used by the RootView to perform an optimization when 15331 * the view hierarchy contains one or several SurfaceView. 15332 * SurfaceView is always considered transparent, but its children are not, 15333 * therefore all View objects remove themselves from the global transparent 15334 * region (passed as a parameter to this function). 15335 * 15336 * @param region The transparent region for this ViewAncestor (window). 15337 * 15338 * @return Returns true if the effective visibility of the view at this 15339 * point is opaque, regardless of the transparent region; returns false 15340 * if it is possible for underlying windows to be seen behind the view. 15341 * 15342 * {@hide} 15343 */ 15344 public boolean gatherTransparentRegion(Region region) { 15345 final AttachInfo attachInfo = mAttachInfo; 15346 if (region != null && attachInfo != null) { 15347 final int pflags = mPrivateFlags; 15348 if ((pflags & SKIP_DRAW) == 0) { 15349 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15350 // remove it from the transparent region. 15351 final int[] location = attachInfo.mTransparentLocation; 15352 getLocationInWindow(location); 15353 region.op(location[0], location[1], location[0] + mRight - mLeft, 15354 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15355 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15356 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15357 // exists, so we remove the background drawable's non-transparent 15358 // parts from this transparent region. 15359 applyDrawableToTransparentRegion(mBackground, region); 15360 } 15361 } 15362 return true; 15363 } 15364 15365 /** 15366 * Play a sound effect for this view. 15367 * 15368 * <p>The framework will play sound effects for some built in actions, such as 15369 * clicking, but you may wish to play these effects in your widget, 15370 * for instance, for internal navigation. 15371 * 15372 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15373 * {@link #isSoundEffectsEnabled()} is true. 15374 * 15375 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15376 */ 15377 public void playSoundEffect(int soundConstant) { 15378 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15379 return; 15380 } 15381 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15382 } 15383 15384 /** 15385 * BZZZTT!!1! 15386 * 15387 * <p>Provide haptic feedback to the user for this view. 15388 * 15389 * <p>The framework will provide haptic feedback for some built in actions, 15390 * such as long presses, but you may wish to provide feedback for your 15391 * own widget. 15392 * 15393 * <p>The feedback will only be performed if 15394 * {@link #isHapticFeedbackEnabled()} is true. 15395 * 15396 * @param feedbackConstant One of the constants defined in 15397 * {@link HapticFeedbackConstants} 15398 */ 15399 public boolean performHapticFeedback(int feedbackConstant) { 15400 return performHapticFeedback(feedbackConstant, 0); 15401 } 15402 15403 /** 15404 * BZZZTT!!1! 15405 * 15406 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15407 * 15408 * @param feedbackConstant One of the constants defined in 15409 * {@link HapticFeedbackConstants} 15410 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15411 */ 15412 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15413 if (mAttachInfo == null) { 15414 return false; 15415 } 15416 //noinspection SimplifiableIfStatement 15417 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15418 && !isHapticFeedbackEnabled()) { 15419 return false; 15420 } 15421 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15422 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15423 } 15424 15425 /** 15426 * Request that the visibility of the status bar or other screen/window 15427 * decorations be changed. 15428 * 15429 * <p>This method is used to put the over device UI into temporary modes 15430 * where the user's attention is focused more on the application content, 15431 * by dimming or hiding surrounding system affordances. This is typically 15432 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15433 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15434 * to be placed behind the action bar (and with these flags other system 15435 * affordances) so that smooth transitions between hiding and showing them 15436 * can be done. 15437 * 15438 * <p>Two representative examples of the use of system UI visibility is 15439 * implementing a content browsing application (like a magazine reader) 15440 * and a video playing application. 15441 * 15442 * <p>The first code shows a typical implementation of a View in a content 15443 * browsing application. In this implementation, the application goes 15444 * into a content-oriented mode by hiding the status bar and action bar, 15445 * and putting the navigation elements into lights out mode. The user can 15446 * then interact with content while in this mode. Such an application should 15447 * provide an easy way for the user to toggle out of the mode (such as to 15448 * check information in the status bar or access notifications). In the 15449 * implementation here, this is done simply by tapping on the content. 15450 * 15451 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15452 * content} 15453 * 15454 * <p>This second code sample shows a typical implementation of a View 15455 * in a video playing application. In this situation, while the video is 15456 * playing the application would like to go into a complete full-screen mode, 15457 * to use as much of the display as possible for the video. When in this state 15458 * the user can not interact with the application; the system intercepts 15459 * touching on the screen to pop the UI out of full screen mode. See 15460 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15461 * 15462 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15463 * content} 15464 * 15465 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15466 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15467 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15468 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15469 */ 15470 public void setSystemUiVisibility(int visibility) { 15471 if (visibility != mSystemUiVisibility) { 15472 mSystemUiVisibility = visibility; 15473 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15474 mParent.recomputeViewAttributes(this); 15475 } 15476 } 15477 } 15478 15479 /** 15480 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15481 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15482 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15483 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15484 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15485 */ 15486 public int getSystemUiVisibility() { 15487 return mSystemUiVisibility; 15488 } 15489 15490 /** 15491 * Returns the current system UI visibility that is currently set for 15492 * the entire window. This is the combination of the 15493 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15494 * views in the window. 15495 */ 15496 public int getWindowSystemUiVisibility() { 15497 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15498 } 15499 15500 /** 15501 * Override to find out when the window's requested system UI visibility 15502 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15503 * This is different from the callbacks recieved through 15504 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15505 * in that this is only telling you about the local request of the window, 15506 * not the actual values applied by the system. 15507 */ 15508 public void onWindowSystemUiVisibilityChanged(int visible) { 15509 } 15510 15511 /** 15512 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15513 * the view hierarchy. 15514 */ 15515 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15516 onWindowSystemUiVisibilityChanged(visible); 15517 } 15518 15519 /** 15520 * Set a listener to receive callbacks when the visibility of the system bar changes. 15521 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15522 */ 15523 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15524 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15525 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15526 mParent.recomputeViewAttributes(this); 15527 } 15528 } 15529 15530 /** 15531 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15532 * the view hierarchy. 15533 */ 15534 public void dispatchSystemUiVisibilityChanged(int visibility) { 15535 ListenerInfo li = mListenerInfo; 15536 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15537 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15538 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15539 } 15540 } 15541 15542 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15543 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15544 if (val != mSystemUiVisibility) { 15545 setSystemUiVisibility(val); 15546 return true; 15547 } 15548 return false; 15549 } 15550 15551 /** @hide */ 15552 public void setDisabledSystemUiVisibility(int flags) { 15553 if (mAttachInfo != null) { 15554 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15555 mAttachInfo.mDisabledSystemUiVisibility = flags; 15556 if (mParent != null) { 15557 mParent.recomputeViewAttributes(this); 15558 } 15559 } 15560 } 15561 } 15562 15563 /** 15564 * Creates an image that the system displays during the drag and drop 15565 * operation. This is called a "drag shadow". The default implementation 15566 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15567 * appearance as the given View. The default also positions the center of the drag shadow 15568 * directly under the touch point. If no View is provided (the constructor with no parameters 15569 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15570 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15571 * default is an invisible drag shadow. 15572 * <p> 15573 * You are not required to use the View you provide to the constructor as the basis of the 15574 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15575 * anything you want as the drag shadow. 15576 * </p> 15577 * <p> 15578 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15579 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15580 * size and position of the drag shadow. It uses this data to construct a 15581 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15582 * so that your application can draw the shadow image in the Canvas. 15583 * </p> 15584 * 15585 * <div class="special reference"> 15586 * <h3>Developer Guides</h3> 15587 * <p>For a guide to implementing drag and drop features, read the 15588 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15589 * </div> 15590 */ 15591 public static class DragShadowBuilder { 15592 private final WeakReference<View> mView; 15593 15594 /** 15595 * Constructs a shadow image builder based on a View. By default, the resulting drag 15596 * shadow will have the same appearance and dimensions as the View, with the touch point 15597 * over the center of the View. 15598 * @param view A View. Any View in scope can be used. 15599 */ 15600 public DragShadowBuilder(View view) { 15601 mView = new WeakReference<View>(view); 15602 } 15603 15604 /** 15605 * Construct a shadow builder object with no associated View. This 15606 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15607 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15608 * to supply the drag shadow's dimensions and appearance without 15609 * reference to any View object. If they are not overridden, then the result is an 15610 * invisible drag shadow. 15611 */ 15612 public DragShadowBuilder() { 15613 mView = new WeakReference<View>(null); 15614 } 15615 15616 /** 15617 * Returns the View object that had been passed to the 15618 * {@link #View.DragShadowBuilder(View)} 15619 * constructor. If that View parameter was {@code null} or if the 15620 * {@link #View.DragShadowBuilder()} 15621 * constructor was used to instantiate the builder object, this method will return 15622 * null. 15623 * 15624 * @return The View object associate with this builder object. 15625 */ 15626 @SuppressWarnings({"JavadocReference"}) 15627 final public View getView() { 15628 return mView.get(); 15629 } 15630 15631 /** 15632 * Provides the metrics for the shadow image. These include the dimensions of 15633 * the shadow image, and the point within that shadow that should 15634 * be centered under the touch location while dragging. 15635 * <p> 15636 * The default implementation sets the dimensions of the shadow to be the 15637 * same as the dimensions of the View itself and centers the shadow under 15638 * the touch point. 15639 * </p> 15640 * 15641 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15642 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15643 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15644 * image. 15645 * 15646 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15647 * shadow image that should be underneath the touch point during the drag and drop 15648 * operation. Your application must set {@link android.graphics.Point#x} to the 15649 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15650 */ 15651 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15652 final View view = mView.get(); 15653 if (view != null) { 15654 shadowSize.set(view.getWidth(), view.getHeight()); 15655 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15656 } else { 15657 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15658 } 15659 } 15660 15661 /** 15662 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15663 * based on the dimensions it received from the 15664 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15665 * 15666 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15667 */ 15668 public void onDrawShadow(Canvas canvas) { 15669 final View view = mView.get(); 15670 if (view != null) { 15671 view.draw(canvas); 15672 } else { 15673 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15674 } 15675 } 15676 } 15677 15678 /** 15679 * Starts a drag and drop operation. When your application calls this method, it passes a 15680 * {@link android.view.View.DragShadowBuilder} object to the system. The 15681 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15682 * to get metrics for the drag shadow, and then calls the object's 15683 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15684 * <p> 15685 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15686 * drag events to all the View objects in your application that are currently visible. It does 15687 * this either by calling the View object's drag listener (an implementation of 15688 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15689 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15690 * Both are passed a {@link android.view.DragEvent} object that has a 15691 * {@link android.view.DragEvent#getAction()} value of 15692 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15693 * </p> 15694 * <p> 15695 * Your application can invoke startDrag() on any attached View object. The View object does not 15696 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15697 * be related to the View the user selected for dragging. 15698 * </p> 15699 * @param data A {@link android.content.ClipData} object pointing to the data to be 15700 * transferred by the drag and drop operation. 15701 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15702 * drag shadow. 15703 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15704 * drop operation. This Object is put into every DragEvent object sent by the system during the 15705 * current drag. 15706 * <p> 15707 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15708 * to the target Views. For example, it can contain flags that differentiate between a 15709 * a copy operation and a move operation. 15710 * </p> 15711 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15712 * so the parameter should be set to 0. 15713 * @return {@code true} if the method completes successfully, or 15714 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15715 * do a drag, and so no drag operation is in progress. 15716 */ 15717 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15718 Object myLocalState, int flags) { 15719 if (ViewDebug.DEBUG_DRAG) { 15720 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15721 } 15722 boolean okay = false; 15723 15724 Point shadowSize = new Point(); 15725 Point shadowTouchPoint = new Point(); 15726 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15727 15728 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15729 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15730 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15731 } 15732 15733 if (ViewDebug.DEBUG_DRAG) { 15734 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15735 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15736 } 15737 Surface surface = new Surface(); 15738 try { 15739 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15740 flags, shadowSize.x, shadowSize.y, surface); 15741 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15742 + " surface=" + surface); 15743 if (token != null) { 15744 Canvas canvas = surface.lockCanvas(null); 15745 try { 15746 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15747 shadowBuilder.onDrawShadow(canvas); 15748 } finally { 15749 surface.unlockCanvasAndPost(canvas); 15750 } 15751 15752 final ViewRootImpl root = getViewRootImpl(); 15753 15754 // Cache the local state object for delivery with DragEvents 15755 root.setLocalDragState(myLocalState); 15756 15757 // repurpose 'shadowSize' for the last touch point 15758 root.getLastTouchPoint(shadowSize); 15759 15760 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15761 shadowSize.x, shadowSize.y, 15762 shadowTouchPoint.x, shadowTouchPoint.y, data); 15763 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15764 15765 // Off and running! Release our local surface instance; the drag 15766 // shadow surface is now managed by the system process. 15767 surface.release(); 15768 } 15769 } catch (Exception e) { 15770 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15771 surface.destroy(); 15772 } 15773 15774 return okay; 15775 } 15776 15777 /** 15778 * Handles drag events sent by the system following a call to 15779 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15780 *<p> 15781 * When the system calls this method, it passes a 15782 * {@link android.view.DragEvent} object. A call to 15783 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15784 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15785 * operation. 15786 * @param event The {@link android.view.DragEvent} sent by the system. 15787 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15788 * in DragEvent, indicating the type of drag event represented by this object. 15789 * @return {@code true} if the method was successful, otherwise {@code false}. 15790 * <p> 15791 * The method should return {@code true} in response to an action type of 15792 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15793 * operation. 15794 * </p> 15795 * <p> 15796 * The method should also return {@code true} in response to an action type of 15797 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15798 * {@code false} if it didn't. 15799 * </p> 15800 */ 15801 public boolean onDragEvent(DragEvent event) { 15802 return false; 15803 } 15804 15805 /** 15806 * Detects if this View is enabled and has a drag event listener. 15807 * If both are true, then it calls the drag event listener with the 15808 * {@link android.view.DragEvent} it received. If the drag event listener returns 15809 * {@code true}, then dispatchDragEvent() returns {@code true}. 15810 * <p> 15811 * For all other cases, the method calls the 15812 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15813 * method and returns its result. 15814 * </p> 15815 * <p> 15816 * This ensures that a drag event is always consumed, even if the View does not have a drag 15817 * event listener. However, if the View has a listener and the listener returns true, then 15818 * onDragEvent() is not called. 15819 * </p> 15820 */ 15821 public boolean dispatchDragEvent(DragEvent event) { 15822 //noinspection SimplifiableIfStatement 15823 ListenerInfo li = mListenerInfo; 15824 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15825 && li.mOnDragListener.onDrag(this, event)) { 15826 return true; 15827 } 15828 return onDragEvent(event); 15829 } 15830 15831 boolean canAcceptDrag() { 15832 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15833 } 15834 15835 /** 15836 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15837 * it is ever exposed at all. 15838 * @hide 15839 */ 15840 public void onCloseSystemDialogs(String reason) { 15841 } 15842 15843 /** 15844 * Given a Drawable whose bounds have been set to draw into this view, 15845 * update a Region being computed for 15846 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15847 * that any non-transparent parts of the Drawable are removed from the 15848 * given transparent region. 15849 * 15850 * @param dr The Drawable whose transparency is to be applied to the region. 15851 * @param region A Region holding the current transparency information, 15852 * where any parts of the region that are set are considered to be 15853 * transparent. On return, this region will be modified to have the 15854 * transparency information reduced by the corresponding parts of the 15855 * Drawable that are not transparent. 15856 * {@hide} 15857 */ 15858 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15859 if (DBG) { 15860 Log.i("View", "Getting transparent region for: " + this); 15861 } 15862 final Region r = dr.getTransparentRegion(); 15863 final Rect db = dr.getBounds(); 15864 final AttachInfo attachInfo = mAttachInfo; 15865 if (r != null && attachInfo != null) { 15866 final int w = getRight()-getLeft(); 15867 final int h = getBottom()-getTop(); 15868 if (db.left > 0) { 15869 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15870 r.op(0, 0, db.left, h, Region.Op.UNION); 15871 } 15872 if (db.right < w) { 15873 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15874 r.op(db.right, 0, w, h, Region.Op.UNION); 15875 } 15876 if (db.top > 0) { 15877 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15878 r.op(0, 0, w, db.top, Region.Op.UNION); 15879 } 15880 if (db.bottom < h) { 15881 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15882 r.op(0, db.bottom, w, h, Region.Op.UNION); 15883 } 15884 final int[] location = attachInfo.mTransparentLocation; 15885 getLocationInWindow(location); 15886 r.translate(location[0], location[1]); 15887 region.op(r, Region.Op.INTERSECT); 15888 } else { 15889 region.op(db, Region.Op.DIFFERENCE); 15890 } 15891 } 15892 15893 private void checkForLongClick(int delayOffset) { 15894 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15895 mHasPerformedLongPress = false; 15896 15897 if (mPendingCheckForLongPress == null) { 15898 mPendingCheckForLongPress = new CheckForLongPress(); 15899 } 15900 mPendingCheckForLongPress.rememberWindowAttachCount(); 15901 postDelayed(mPendingCheckForLongPress, 15902 ViewConfiguration.getLongPressTimeout() - delayOffset); 15903 } 15904 } 15905 15906 /** 15907 * Inflate a view from an XML resource. This convenience method wraps the {@link 15908 * LayoutInflater} class, which provides a full range of options for view inflation. 15909 * 15910 * @param context The Context object for your activity or application. 15911 * @param resource The resource ID to inflate 15912 * @param root A view group that will be the parent. Used to properly inflate the 15913 * layout_* parameters. 15914 * @see LayoutInflater 15915 */ 15916 public static View inflate(Context context, int resource, ViewGroup root) { 15917 LayoutInflater factory = LayoutInflater.from(context); 15918 return factory.inflate(resource, root); 15919 } 15920 15921 /** 15922 * Scroll the view with standard behavior for scrolling beyond the normal 15923 * content boundaries. Views that call this method should override 15924 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15925 * results of an over-scroll operation. 15926 * 15927 * Views can use this method to handle any touch or fling-based scrolling. 15928 * 15929 * @param deltaX Change in X in pixels 15930 * @param deltaY Change in Y in pixels 15931 * @param scrollX Current X scroll value in pixels before applying deltaX 15932 * @param scrollY Current Y scroll value in pixels before applying deltaY 15933 * @param scrollRangeX Maximum content scroll range along the X axis 15934 * @param scrollRangeY Maximum content scroll range along the Y axis 15935 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15936 * along the X axis. 15937 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15938 * along the Y axis. 15939 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15940 * @return true if scrolling was clamped to an over-scroll boundary along either 15941 * axis, false otherwise. 15942 */ 15943 @SuppressWarnings({"UnusedParameters"}) 15944 protected boolean overScrollBy(int deltaX, int deltaY, 15945 int scrollX, int scrollY, 15946 int scrollRangeX, int scrollRangeY, 15947 int maxOverScrollX, int maxOverScrollY, 15948 boolean isTouchEvent) { 15949 final int overScrollMode = mOverScrollMode; 15950 final boolean canScrollHorizontal = 15951 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15952 final boolean canScrollVertical = 15953 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15954 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15955 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15956 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15957 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15958 15959 int newScrollX = scrollX + deltaX; 15960 if (!overScrollHorizontal) { 15961 maxOverScrollX = 0; 15962 } 15963 15964 int newScrollY = scrollY + deltaY; 15965 if (!overScrollVertical) { 15966 maxOverScrollY = 0; 15967 } 15968 15969 // Clamp values if at the limits and record 15970 final int left = -maxOverScrollX; 15971 final int right = maxOverScrollX + scrollRangeX; 15972 final int top = -maxOverScrollY; 15973 final int bottom = maxOverScrollY + scrollRangeY; 15974 15975 boolean clampedX = false; 15976 if (newScrollX > right) { 15977 newScrollX = right; 15978 clampedX = true; 15979 } else if (newScrollX < left) { 15980 newScrollX = left; 15981 clampedX = true; 15982 } 15983 15984 boolean clampedY = false; 15985 if (newScrollY > bottom) { 15986 newScrollY = bottom; 15987 clampedY = true; 15988 } else if (newScrollY < top) { 15989 newScrollY = top; 15990 clampedY = true; 15991 } 15992 15993 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15994 15995 return clampedX || clampedY; 15996 } 15997 15998 /** 15999 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16000 * respond to the results of an over-scroll operation. 16001 * 16002 * @param scrollX New X scroll value in pixels 16003 * @param scrollY New Y scroll value in pixels 16004 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16005 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16006 */ 16007 protected void onOverScrolled(int scrollX, int scrollY, 16008 boolean clampedX, boolean clampedY) { 16009 // Intentionally empty. 16010 } 16011 16012 /** 16013 * Returns the over-scroll mode for this view. The result will be 16014 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16015 * (allow over-scrolling only if the view content is larger than the container), 16016 * or {@link #OVER_SCROLL_NEVER}. 16017 * 16018 * @return This view's over-scroll mode. 16019 */ 16020 public int getOverScrollMode() { 16021 return mOverScrollMode; 16022 } 16023 16024 /** 16025 * Set the over-scroll mode for this view. Valid over-scroll modes are 16026 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16027 * (allow over-scrolling only if the view content is larger than the container), 16028 * or {@link #OVER_SCROLL_NEVER}. 16029 * 16030 * Setting the over-scroll mode of a view will have an effect only if the 16031 * view is capable of scrolling. 16032 * 16033 * @param overScrollMode The new over-scroll mode for this view. 16034 */ 16035 public void setOverScrollMode(int overScrollMode) { 16036 if (overScrollMode != OVER_SCROLL_ALWAYS && 16037 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16038 overScrollMode != OVER_SCROLL_NEVER) { 16039 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16040 } 16041 mOverScrollMode = overScrollMode; 16042 } 16043 16044 /** 16045 * Gets a scale factor that determines the distance the view should scroll 16046 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16047 * @return The vertical scroll scale factor. 16048 * @hide 16049 */ 16050 protected float getVerticalScrollFactor() { 16051 if (mVerticalScrollFactor == 0) { 16052 TypedValue outValue = new TypedValue(); 16053 if (!mContext.getTheme().resolveAttribute( 16054 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16055 throw new IllegalStateException( 16056 "Expected theme to define listPreferredItemHeight."); 16057 } 16058 mVerticalScrollFactor = outValue.getDimension( 16059 mContext.getResources().getDisplayMetrics()); 16060 } 16061 return mVerticalScrollFactor; 16062 } 16063 16064 /** 16065 * Gets a scale factor that determines the distance the view should scroll 16066 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16067 * @return The horizontal scroll scale factor. 16068 * @hide 16069 */ 16070 protected float getHorizontalScrollFactor() { 16071 // TODO: Should use something else. 16072 return getVerticalScrollFactor(); 16073 } 16074 16075 /** 16076 * Return the value specifying the text direction or policy that was set with 16077 * {@link #setTextDirection(int)}. 16078 * 16079 * @return the defined text direction. It can be one of: 16080 * 16081 * {@link #TEXT_DIRECTION_INHERIT}, 16082 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16083 * {@link #TEXT_DIRECTION_ANY_RTL}, 16084 * {@link #TEXT_DIRECTION_LTR}, 16085 * {@link #TEXT_DIRECTION_RTL}, 16086 * {@link #TEXT_DIRECTION_LOCALE} 16087 */ 16088 @ViewDebug.ExportedProperty(category = "text", mapping = { 16089 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16090 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16091 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16092 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16093 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16094 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16095 }) 16096 public int getTextDirection() { 16097 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16098 } 16099 16100 /** 16101 * Set the text direction. 16102 * 16103 * @param textDirection the direction to set. Should be one of: 16104 * 16105 * {@link #TEXT_DIRECTION_INHERIT}, 16106 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16107 * {@link #TEXT_DIRECTION_ANY_RTL}, 16108 * {@link #TEXT_DIRECTION_LTR}, 16109 * {@link #TEXT_DIRECTION_RTL}, 16110 * {@link #TEXT_DIRECTION_LOCALE} 16111 */ 16112 public void setTextDirection(int textDirection) { 16113 if (getTextDirection() != textDirection) { 16114 // Reset the current text direction and the resolved one 16115 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16116 resetResolvedTextDirection(); 16117 // Set the new text direction 16118 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16119 // Refresh 16120 requestLayout(); 16121 invalidate(true); 16122 } 16123 } 16124 16125 /** 16126 * Return the resolved text direction. 16127 * 16128 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16129 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16130 * up the parent chain of the view. if there is no parent, then it will return the default 16131 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16132 * 16133 * @return the resolved text direction. Returns one of: 16134 * 16135 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16136 * {@link #TEXT_DIRECTION_ANY_RTL}, 16137 * {@link #TEXT_DIRECTION_LTR}, 16138 * {@link #TEXT_DIRECTION_RTL}, 16139 * {@link #TEXT_DIRECTION_LOCALE} 16140 */ 16141 public int getResolvedTextDirection() { 16142 // The text direction will be resolved only if needed 16143 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16144 resolveTextDirection(); 16145 } 16146 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16147 } 16148 16149 /** 16150 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16151 * resolution is done. 16152 */ 16153 public void resolveTextDirection() { 16154 // Reset any previous text direction resolution 16155 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16156 16157 if (hasRtlSupport()) { 16158 // Set resolved text direction flag depending on text direction flag 16159 final int textDirection = getTextDirection(); 16160 switch(textDirection) { 16161 case TEXT_DIRECTION_INHERIT: 16162 if (canResolveTextDirection()) { 16163 ViewGroup viewGroup = ((ViewGroup) mParent); 16164 16165 // Set current resolved direction to the same value as the parent's one 16166 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16167 switch (parentResolvedDirection) { 16168 case TEXT_DIRECTION_FIRST_STRONG: 16169 case TEXT_DIRECTION_ANY_RTL: 16170 case TEXT_DIRECTION_LTR: 16171 case TEXT_DIRECTION_RTL: 16172 case TEXT_DIRECTION_LOCALE: 16173 mPrivateFlags2 |= 16174 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16175 break; 16176 default: 16177 // Default resolved direction is "first strong" heuristic 16178 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16179 } 16180 } else { 16181 // We cannot do the resolution if there is no parent, so use the default one 16182 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16183 } 16184 break; 16185 case TEXT_DIRECTION_FIRST_STRONG: 16186 case TEXT_DIRECTION_ANY_RTL: 16187 case TEXT_DIRECTION_LTR: 16188 case TEXT_DIRECTION_RTL: 16189 case TEXT_DIRECTION_LOCALE: 16190 // Resolved direction is the same as text direction 16191 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16192 break; 16193 default: 16194 // Default resolved direction is "first strong" heuristic 16195 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16196 } 16197 } else { 16198 // Default resolved direction is "first strong" heuristic 16199 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16200 } 16201 16202 // Set to resolved 16203 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16204 onResolvedTextDirectionChanged(); 16205 } 16206 16207 /** 16208 * Called when text direction has been resolved. Subclasses that care about text direction 16209 * resolution should override this method. 16210 * 16211 * The default implementation does nothing. 16212 */ 16213 public void onResolvedTextDirectionChanged() { 16214 } 16215 16216 /** 16217 * Check if text direction resolution can be done. 16218 * 16219 * @return true if text direction resolution can be done otherwise return false. 16220 */ 16221 public boolean canResolveTextDirection() { 16222 switch (getTextDirection()) { 16223 case TEXT_DIRECTION_INHERIT: 16224 return (mParent != null) && (mParent instanceof ViewGroup); 16225 default: 16226 return true; 16227 } 16228 } 16229 16230 /** 16231 * Reset resolved text direction. Text direction can be resolved with a call to 16232 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16233 * reset is done. 16234 */ 16235 public void resetResolvedTextDirection() { 16236 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16237 onResolvedTextDirectionReset(); 16238 } 16239 16240 /** 16241 * Called when text direction is reset. Subclasses that care about text direction reset should 16242 * override this method and do a reset of the text direction of their children. The default 16243 * implementation does nothing. 16244 */ 16245 public void onResolvedTextDirectionReset() { 16246 } 16247 16248 /** 16249 * Return the value specifying the text alignment or policy that was set with 16250 * {@link #setTextAlignment(int)}. 16251 * 16252 * @return the defined text alignment. It can be one of: 16253 * 16254 * {@link #TEXT_ALIGNMENT_INHERIT}, 16255 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16256 * {@link #TEXT_ALIGNMENT_CENTER}, 16257 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16258 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16259 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16260 * {@link #TEXT_ALIGNMENT_VIEW_END} 16261 */ 16262 @ViewDebug.ExportedProperty(category = "text", mapping = { 16263 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16264 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16265 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16266 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16267 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16268 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16269 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16270 }) 16271 public int getTextAlignment() { 16272 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16273 } 16274 16275 /** 16276 * Set the text alignment. 16277 * 16278 * @param textAlignment The text alignment to set. Should be one of 16279 * 16280 * {@link #TEXT_ALIGNMENT_INHERIT}, 16281 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16282 * {@link #TEXT_ALIGNMENT_CENTER}, 16283 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16284 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16285 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16286 * {@link #TEXT_ALIGNMENT_VIEW_END} 16287 * 16288 * @attr ref android.R.styleable#View_textAlignment 16289 */ 16290 public void setTextAlignment(int textAlignment) { 16291 if (textAlignment != getTextAlignment()) { 16292 // Reset the current and resolved text alignment 16293 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16294 resetResolvedTextAlignment(); 16295 // Set the new text alignment 16296 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16297 // Refresh 16298 requestLayout(); 16299 invalidate(true); 16300 } 16301 } 16302 16303 /** 16304 * Return the resolved text alignment. 16305 * 16306 * The resolved text alignment. This needs resolution if the value is 16307 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16308 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16309 * 16310 * @return the resolved text alignment. Returns one of: 16311 * 16312 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16313 * {@link #TEXT_ALIGNMENT_CENTER}, 16314 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16315 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16316 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16317 * {@link #TEXT_ALIGNMENT_VIEW_END} 16318 */ 16319 @ViewDebug.ExportedProperty(category = "text", mapping = { 16320 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16321 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16322 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16323 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16324 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16325 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16326 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16327 }) 16328 public int getResolvedTextAlignment() { 16329 // If text alignment is not resolved, then resolve it 16330 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16331 resolveTextAlignment(); 16332 } 16333 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16334 } 16335 16336 /** 16337 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16338 * resolution is done. 16339 */ 16340 public void resolveTextAlignment() { 16341 // Reset any previous text alignment resolution 16342 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16343 16344 if (hasRtlSupport()) { 16345 // Set resolved text alignment flag depending on text alignment flag 16346 final int textAlignment = getTextAlignment(); 16347 switch (textAlignment) { 16348 case TEXT_ALIGNMENT_INHERIT: 16349 // Check if we can resolve the text alignment 16350 if (canResolveLayoutDirection() && mParent instanceof View) { 16351 View view = (View) mParent; 16352 16353 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16354 switch (parentResolvedTextAlignment) { 16355 case TEXT_ALIGNMENT_GRAVITY: 16356 case TEXT_ALIGNMENT_TEXT_START: 16357 case TEXT_ALIGNMENT_TEXT_END: 16358 case TEXT_ALIGNMENT_CENTER: 16359 case TEXT_ALIGNMENT_VIEW_START: 16360 case TEXT_ALIGNMENT_VIEW_END: 16361 // Resolved text alignment is the same as the parent resolved 16362 // text alignment 16363 mPrivateFlags2 |= 16364 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16365 break; 16366 default: 16367 // Use default resolved text alignment 16368 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16369 } 16370 } 16371 else { 16372 // We cannot do the resolution if there is no parent so use the default 16373 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16374 } 16375 break; 16376 case TEXT_ALIGNMENT_GRAVITY: 16377 case TEXT_ALIGNMENT_TEXT_START: 16378 case TEXT_ALIGNMENT_TEXT_END: 16379 case TEXT_ALIGNMENT_CENTER: 16380 case TEXT_ALIGNMENT_VIEW_START: 16381 case TEXT_ALIGNMENT_VIEW_END: 16382 // Resolved text alignment is the same as text alignment 16383 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16384 break; 16385 default: 16386 // Use default resolved text alignment 16387 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16388 } 16389 } else { 16390 // Use default resolved text alignment 16391 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16392 } 16393 16394 // Set the resolved 16395 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16396 onResolvedTextAlignmentChanged(); 16397 } 16398 16399 /** 16400 * Check if text alignment resolution can be done. 16401 * 16402 * @return true if text alignment resolution can be done otherwise return false. 16403 */ 16404 public boolean canResolveTextAlignment() { 16405 switch (getTextAlignment()) { 16406 case TEXT_DIRECTION_INHERIT: 16407 return (mParent != null); 16408 default: 16409 return true; 16410 } 16411 } 16412 16413 /** 16414 * Called when text alignment has been resolved. Subclasses that care about text alignment 16415 * resolution should override this method. 16416 * 16417 * The default implementation does nothing. 16418 */ 16419 public void onResolvedTextAlignmentChanged() { 16420 } 16421 16422 /** 16423 * Reset resolved text alignment. Text alignment can be resolved with a call to 16424 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16425 * reset is done. 16426 */ 16427 public void resetResolvedTextAlignment() { 16428 // Reset any previous text alignment resolution 16429 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16430 onResolvedTextAlignmentReset(); 16431 } 16432 16433 /** 16434 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16435 * override this method and do a reset of the text alignment of their children. The default 16436 * implementation does nothing. 16437 */ 16438 public void onResolvedTextAlignmentReset() { 16439 } 16440 16441 // 16442 // Properties 16443 // 16444 /** 16445 * A Property wrapper around the <code>alpha</code> functionality handled by the 16446 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16447 */ 16448 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16449 @Override 16450 public void setValue(View object, float value) { 16451 object.setAlpha(value); 16452 } 16453 16454 @Override 16455 public Float get(View object) { 16456 return object.getAlpha(); 16457 } 16458 }; 16459 16460 /** 16461 * A Property wrapper around the <code>translationX</code> functionality handled by the 16462 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16463 */ 16464 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16465 @Override 16466 public void setValue(View object, float value) { 16467 object.setTranslationX(value); 16468 } 16469 16470 @Override 16471 public Float get(View object) { 16472 return object.getTranslationX(); 16473 } 16474 }; 16475 16476 /** 16477 * A Property wrapper around the <code>translationY</code> functionality handled by the 16478 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16479 */ 16480 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16481 @Override 16482 public void setValue(View object, float value) { 16483 object.setTranslationY(value); 16484 } 16485 16486 @Override 16487 public Float get(View object) { 16488 return object.getTranslationY(); 16489 } 16490 }; 16491 16492 /** 16493 * A Property wrapper around the <code>x</code> functionality handled by the 16494 * {@link View#setX(float)} and {@link View#getX()} methods. 16495 */ 16496 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16497 @Override 16498 public void setValue(View object, float value) { 16499 object.setX(value); 16500 } 16501 16502 @Override 16503 public Float get(View object) { 16504 return object.getX(); 16505 } 16506 }; 16507 16508 /** 16509 * A Property wrapper around the <code>y</code> functionality handled by the 16510 * {@link View#setY(float)} and {@link View#getY()} methods. 16511 */ 16512 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16513 @Override 16514 public void setValue(View object, float value) { 16515 object.setY(value); 16516 } 16517 16518 @Override 16519 public Float get(View object) { 16520 return object.getY(); 16521 } 16522 }; 16523 16524 /** 16525 * A Property wrapper around the <code>rotation</code> functionality handled by the 16526 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16527 */ 16528 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16529 @Override 16530 public void setValue(View object, float value) { 16531 object.setRotation(value); 16532 } 16533 16534 @Override 16535 public Float get(View object) { 16536 return object.getRotation(); 16537 } 16538 }; 16539 16540 /** 16541 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16542 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16543 */ 16544 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16545 @Override 16546 public void setValue(View object, float value) { 16547 object.setRotationX(value); 16548 } 16549 16550 @Override 16551 public Float get(View object) { 16552 return object.getRotationX(); 16553 } 16554 }; 16555 16556 /** 16557 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16558 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16559 */ 16560 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16561 @Override 16562 public void setValue(View object, float value) { 16563 object.setRotationY(value); 16564 } 16565 16566 @Override 16567 public Float get(View object) { 16568 return object.getRotationY(); 16569 } 16570 }; 16571 16572 /** 16573 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16574 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16575 */ 16576 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16577 @Override 16578 public void setValue(View object, float value) { 16579 object.setScaleX(value); 16580 } 16581 16582 @Override 16583 public Float get(View object) { 16584 return object.getScaleX(); 16585 } 16586 }; 16587 16588 /** 16589 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16590 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16591 */ 16592 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16593 @Override 16594 public void setValue(View object, float value) { 16595 object.setScaleY(value); 16596 } 16597 16598 @Override 16599 public Float get(View object) { 16600 return object.getScaleY(); 16601 } 16602 }; 16603 16604 /** 16605 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16606 * Each MeasureSpec represents a requirement for either the width or the height. 16607 * A MeasureSpec is comprised of a size and a mode. There are three possible 16608 * modes: 16609 * <dl> 16610 * <dt>UNSPECIFIED</dt> 16611 * <dd> 16612 * The parent has not imposed any constraint on the child. It can be whatever size 16613 * it wants. 16614 * </dd> 16615 * 16616 * <dt>EXACTLY</dt> 16617 * <dd> 16618 * The parent has determined an exact size for the child. The child is going to be 16619 * given those bounds regardless of how big it wants to be. 16620 * </dd> 16621 * 16622 * <dt>AT_MOST</dt> 16623 * <dd> 16624 * The child can be as large as it wants up to the specified size. 16625 * </dd> 16626 * </dl> 16627 * 16628 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16629 * is provided to pack and unpack the <size, mode> tuple into the int. 16630 */ 16631 public static class MeasureSpec { 16632 private static final int MODE_SHIFT = 30; 16633 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16634 16635 /** 16636 * Measure specification mode: The parent has not imposed any constraint 16637 * on the child. It can be whatever size it wants. 16638 */ 16639 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16640 16641 /** 16642 * Measure specification mode: The parent has determined an exact size 16643 * for the child. The child is going to be given those bounds regardless 16644 * of how big it wants to be. 16645 */ 16646 public static final int EXACTLY = 1 << MODE_SHIFT; 16647 16648 /** 16649 * Measure specification mode: The child can be as large as it wants up 16650 * to the specified size. 16651 */ 16652 public static final int AT_MOST = 2 << MODE_SHIFT; 16653 16654 /** 16655 * Creates a measure specification based on the supplied size and mode. 16656 * 16657 * The mode must always be one of the following: 16658 * <ul> 16659 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16660 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16661 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16662 * </ul> 16663 * 16664 * @param size the size of the measure specification 16665 * @param mode the mode of the measure specification 16666 * @return the measure specification based on size and mode 16667 */ 16668 public static int makeMeasureSpec(int size, int mode) { 16669 return size + mode; 16670 } 16671 16672 /** 16673 * Extracts the mode from the supplied measure specification. 16674 * 16675 * @param measureSpec the measure specification to extract the mode from 16676 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16677 * {@link android.view.View.MeasureSpec#AT_MOST} or 16678 * {@link android.view.View.MeasureSpec#EXACTLY} 16679 */ 16680 public static int getMode(int measureSpec) { 16681 return (measureSpec & MODE_MASK); 16682 } 16683 16684 /** 16685 * Extracts the size from the supplied measure specification. 16686 * 16687 * @param measureSpec the measure specification to extract the size from 16688 * @return the size in pixels defined in the supplied measure specification 16689 */ 16690 public static int getSize(int measureSpec) { 16691 return (measureSpec & ~MODE_MASK); 16692 } 16693 16694 /** 16695 * Returns a String representation of the specified measure 16696 * specification. 16697 * 16698 * @param measureSpec the measure specification to convert to a String 16699 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16700 */ 16701 public static String toString(int measureSpec) { 16702 int mode = getMode(measureSpec); 16703 int size = getSize(measureSpec); 16704 16705 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16706 16707 if (mode == UNSPECIFIED) 16708 sb.append("UNSPECIFIED "); 16709 else if (mode == EXACTLY) 16710 sb.append("EXACTLY "); 16711 else if (mode == AT_MOST) 16712 sb.append("AT_MOST "); 16713 else 16714 sb.append(mode).append(" "); 16715 16716 sb.append(size); 16717 return sb.toString(); 16718 } 16719 } 16720 16721 class CheckForLongPress implements Runnable { 16722 16723 private int mOriginalWindowAttachCount; 16724 16725 public void run() { 16726 if (isPressed() && (mParent != null) 16727 && mOriginalWindowAttachCount == mWindowAttachCount) { 16728 if (performLongClick()) { 16729 mHasPerformedLongPress = true; 16730 } 16731 } 16732 } 16733 16734 public void rememberWindowAttachCount() { 16735 mOriginalWindowAttachCount = mWindowAttachCount; 16736 } 16737 } 16738 16739 private final class CheckForTap implements Runnable { 16740 public void run() { 16741 mPrivateFlags &= ~PREPRESSED; 16742 setPressed(true); 16743 checkForLongClick(ViewConfiguration.getTapTimeout()); 16744 } 16745 } 16746 16747 private final class PerformClick implements Runnable { 16748 public void run() { 16749 performClick(); 16750 } 16751 } 16752 16753 /** @hide */ 16754 public void hackTurnOffWindowResizeAnim(boolean off) { 16755 mAttachInfo.mTurnOffWindowResizeAnim = off; 16756 } 16757 16758 /** 16759 * This method returns a ViewPropertyAnimator object, which can be used to animate 16760 * specific properties on this View. 16761 * 16762 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16763 */ 16764 public ViewPropertyAnimator animate() { 16765 if (mAnimator == null) { 16766 mAnimator = new ViewPropertyAnimator(this); 16767 } 16768 return mAnimator; 16769 } 16770 16771 /** 16772 * Interface definition for a callback to be invoked when a key event is 16773 * dispatched to this view. The callback will be invoked before the key 16774 * event is given to the view. 16775 */ 16776 public interface OnKeyListener { 16777 /** 16778 * Called when a key is dispatched to a view. This allows listeners to 16779 * get a chance to respond before the target view. 16780 * 16781 * @param v The view the key has been dispatched to. 16782 * @param keyCode The code for the physical key that was pressed 16783 * @param event The KeyEvent object containing full information about 16784 * the event. 16785 * @return True if the listener has consumed the event, false otherwise. 16786 */ 16787 boolean onKey(View v, int keyCode, KeyEvent event); 16788 } 16789 16790 /** 16791 * Interface definition for a callback to be invoked when a touch event is 16792 * dispatched to this view. The callback will be invoked before the touch 16793 * event is given to the view. 16794 */ 16795 public interface OnTouchListener { 16796 /** 16797 * Called when a touch event is dispatched to a view. This allows listeners to 16798 * get a chance to respond before the target view. 16799 * 16800 * @param v The view the touch event has been dispatched to. 16801 * @param event The MotionEvent object containing full information about 16802 * the event. 16803 * @return True if the listener has consumed the event, false otherwise. 16804 */ 16805 boolean onTouch(View v, MotionEvent event); 16806 } 16807 16808 /** 16809 * Interface definition for a callback to be invoked when a hover event is 16810 * dispatched to this view. The callback will be invoked before the hover 16811 * event is given to the view. 16812 */ 16813 public interface OnHoverListener { 16814 /** 16815 * Called when a hover event is dispatched to a view. This allows listeners to 16816 * get a chance to respond before the target view. 16817 * 16818 * @param v The view the hover event has been dispatched to. 16819 * @param event The MotionEvent object containing full information about 16820 * the event. 16821 * @return True if the listener has consumed the event, false otherwise. 16822 */ 16823 boolean onHover(View v, MotionEvent event); 16824 } 16825 16826 /** 16827 * Interface definition for a callback to be invoked when a generic motion event is 16828 * dispatched to this view. The callback will be invoked before the generic motion 16829 * event is given to the view. 16830 */ 16831 public interface OnGenericMotionListener { 16832 /** 16833 * Called when a generic motion event is dispatched to a view. This allows listeners to 16834 * get a chance to respond before the target view. 16835 * 16836 * @param v The view the generic motion event has been dispatched to. 16837 * @param event The MotionEvent object containing full information about 16838 * the event. 16839 * @return True if the listener has consumed the event, false otherwise. 16840 */ 16841 boolean onGenericMotion(View v, MotionEvent event); 16842 } 16843 16844 /** 16845 * Interface definition for a callback to be invoked when a view has been clicked and held. 16846 */ 16847 public interface OnLongClickListener { 16848 /** 16849 * Called when a view has been clicked and held. 16850 * 16851 * @param v The view that was clicked and held. 16852 * 16853 * @return true if the callback consumed the long click, false otherwise. 16854 */ 16855 boolean onLongClick(View v); 16856 } 16857 16858 /** 16859 * Interface definition for a callback to be invoked when a drag is being dispatched 16860 * to this view. The callback will be invoked before the hosting view's own 16861 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16862 * onDrag(event) behavior, it should return 'false' from this callback. 16863 * 16864 * <div class="special reference"> 16865 * <h3>Developer Guides</h3> 16866 * <p>For a guide to implementing drag and drop features, read the 16867 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16868 * </div> 16869 */ 16870 public interface OnDragListener { 16871 /** 16872 * Called when a drag event is dispatched to a view. This allows listeners 16873 * to get a chance to override base View behavior. 16874 * 16875 * @param v The View that received the drag event. 16876 * @param event The {@link android.view.DragEvent} object for the drag event. 16877 * @return {@code true} if the drag event was handled successfully, or {@code false} 16878 * if the drag event was not handled. Note that {@code false} will trigger the View 16879 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16880 */ 16881 boolean onDrag(View v, DragEvent event); 16882 } 16883 16884 /** 16885 * Interface definition for a callback to be invoked when the focus state of 16886 * a view changed. 16887 */ 16888 public interface OnFocusChangeListener { 16889 /** 16890 * Called when the focus state of a view has changed. 16891 * 16892 * @param v The view whose state has changed. 16893 * @param hasFocus The new focus state of v. 16894 */ 16895 void onFocusChange(View v, boolean hasFocus); 16896 } 16897 16898 /** 16899 * Interface definition for a callback to be invoked when a view is clicked. 16900 */ 16901 public interface OnClickListener { 16902 /** 16903 * Called when a view has been clicked. 16904 * 16905 * @param v The view that was clicked. 16906 */ 16907 void onClick(View v); 16908 } 16909 16910 /** 16911 * Interface definition for a callback to be invoked when the context menu 16912 * for this view is being built. 16913 */ 16914 public interface OnCreateContextMenuListener { 16915 /** 16916 * Called when the context menu for this view is being built. It is not 16917 * safe to hold onto the menu after this method returns. 16918 * 16919 * @param menu The context menu that is being built 16920 * @param v The view for which the context menu is being built 16921 * @param menuInfo Extra information about the item for which the 16922 * context menu should be shown. This information will vary 16923 * depending on the class of v. 16924 */ 16925 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16926 } 16927 16928 /** 16929 * Interface definition for a callback to be invoked when the status bar changes 16930 * visibility. This reports <strong>global</strong> changes to the system UI 16931 * state, not what the application is requesting. 16932 * 16933 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16934 */ 16935 public interface OnSystemUiVisibilityChangeListener { 16936 /** 16937 * Called when the status bar changes visibility because of a call to 16938 * {@link View#setSystemUiVisibility(int)}. 16939 * 16940 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16941 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16942 * This tells you the <strong>global</strong> state of these UI visibility 16943 * flags, not what your app is currently applying. 16944 */ 16945 public void onSystemUiVisibilityChange(int visibility); 16946 } 16947 16948 /** 16949 * Interface definition for a callback to be invoked when this view is attached 16950 * or detached from its window. 16951 */ 16952 public interface OnAttachStateChangeListener { 16953 /** 16954 * Called when the view is attached to a window. 16955 * @param v The view that was attached 16956 */ 16957 public void onViewAttachedToWindow(View v); 16958 /** 16959 * Called when the view is detached from a window. 16960 * @param v The view that was detached 16961 */ 16962 public void onViewDetachedFromWindow(View v); 16963 } 16964 16965 private final class UnsetPressedState implements Runnable { 16966 public void run() { 16967 setPressed(false); 16968 } 16969 } 16970 16971 /** 16972 * Base class for derived classes that want to save and restore their own 16973 * state in {@link android.view.View#onSaveInstanceState()}. 16974 */ 16975 public static class BaseSavedState extends AbsSavedState { 16976 /** 16977 * Constructor used when reading from a parcel. Reads the state of the superclass. 16978 * 16979 * @param source 16980 */ 16981 public BaseSavedState(Parcel source) { 16982 super(source); 16983 } 16984 16985 /** 16986 * Constructor called by derived classes when creating their SavedState objects 16987 * 16988 * @param superState The state of the superclass of this view 16989 */ 16990 public BaseSavedState(Parcelable superState) { 16991 super(superState); 16992 } 16993 16994 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16995 new Parcelable.Creator<BaseSavedState>() { 16996 public BaseSavedState createFromParcel(Parcel in) { 16997 return new BaseSavedState(in); 16998 } 16999 17000 public BaseSavedState[] newArray(int size) { 17001 return new BaseSavedState[size]; 17002 } 17003 }; 17004 } 17005 17006 /** 17007 * A set of information given to a view when it is attached to its parent 17008 * window. 17009 */ 17010 static class AttachInfo { 17011 interface Callbacks { 17012 void playSoundEffect(int effectId); 17013 boolean performHapticFeedback(int effectId, boolean always); 17014 } 17015 17016 /** 17017 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17018 * to a Handler. This class contains the target (View) to invalidate and 17019 * the coordinates of the dirty rectangle. 17020 * 17021 * For performance purposes, this class also implements a pool of up to 17022 * POOL_LIMIT objects that get reused. This reduces memory allocations 17023 * whenever possible. 17024 */ 17025 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17026 private static final int POOL_LIMIT = 10; 17027 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17028 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17029 public InvalidateInfo newInstance() { 17030 return new InvalidateInfo(); 17031 } 17032 17033 public void onAcquired(InvalidateInfo element) { 17034 } 17035 17036 public void onReleased(InvalidateInfo element) { 17037 element.target = null; 17038 } 17039 }, POOL_LIMIT) 17040 ); 17041 17042 private InvalidateInfo mNext; 17043 private boolean mIsPooled; 17044 17045 View target; 17046 17047 int left; 17048 int top; 17049 int right; 17050 int bottom; 17051 17052 public void setNextPoolable(InvalidateInfo element) { 17053 mNext = element; 17054 } 17055 17056 public InvalidateInfo getNextPoolable() { 17057 return mNext; 17058 } 17059 17060 static InvalidateInfo acquire() { 17061 return sPool.acquire(); 17062 } 17063 17064 void release() { 17065 sPool.release(this); 17066 } 17067 17068 public boolean isPooled() { 17069 return mIsPooled; 17070 } 17071 17072 public void setPooled(boolean isPooled) { 17073 mIsPooled = isPooled; 17074 } 17075 } 17076 17077 final IWindowSession mSession; 17078 17079 final IWindow mWindow; 17080 17081 final IBinder mWindowToken; 17082 17083 final Callbacks mRootCallbacks; 17084 17085 HardwareCanvas mHardwareCanvas; 17086 17087 /** 17088 * The top view of the hierarchy. 17089 */ 17090 View mRootView; 17091 17092 IBinder mPanelParentWindowToken; 17093 Surface mSurface; 17094 17095 boolean mHardwareAccelerated; 17096 boolean mHardwareAccelerationRequested; 17097 HardwareRenderer mHardwareRenderer; 17098 17099 boolean mScreenOn; 17100 17101 /** 17102 * Scale factor used by the compatibility mode 17103 */ 17104 float mApplicationScale; 17105 17106 /** 17107 * Indicates whether the application is in compatibility mode 17108 */ 17109 boolean mScalingRequired; 17110 17111 /** 17112 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17113 */ 17114 boolean mTurnOffWindowResizeAnim; 17115 17116 /** 17117 * Left position of this view's window 17118 */ 17119 int mWindowLeft; 17120 17121 /** 17122 * Top position of this view's window 17123 */ 17124 int mWindowTop; 17125 17126 /** 17127 * Indicates whether views need to use 32-bit drawing caches 17128 */ 17129 boolean mUse32BitDrawingCache; 17130 17131 /** 17132 * For windows that are full-screen but using insets to layout inside 17133 * of the screen decorations, these are the current insets for the 17134 * content of the window. 17135 */ 17136 final Rect mContentInsets = new Rect(); 17137 17138 /** 17139 * For windows that are full-screen but using insets to layout inside 17140 * of the screen decorations, these are the current insets for the 17141 * actual visible parts of the window. 17142 */ 17143 final Rect mVisibleInsets = new Rect(); 17144 17145 /** 17146 * The internal insets given by this window. This value is 17147 * supplied by the client (through 17148 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17149 * be given to the window manager when changed to be used in laying 17150 * out windows behind it. 17151 */ 17152 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17153 = new ViewTreeObserver.InternalInsetsInfo(); 17154 17155 /** 17156 * All views in the window's hierarchy that serve as scroll containers, 17157 * used to determine if the window can be resized or must be panned 17158 * to adjust for a soft input area. 17159 */ 17160 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17161 17162 final KeyEvent.DispatcherState mKeyDispatchState 17163 = new KeyEvent.DispatcherState(); 17164 17165 /** 17166 * Indicates whether the view's window currently has the focus. 17167 */ 17168 boolean mHasWindowFocus; 17169 17170 /** 17171 * The current visibility of the window. 17172 */ 17173 int mWindowVisibility; 17174 17175 /** 17176 * Indicates the time at which drawing started to occur. 17177 */ 17178 long mDrawingTime; 17179 17180 /** 17181 * Indicates whether or not ignoring the DIRTY_MASK flags. 17182 */ 17183 boolean mIgnoreDirtyState; 17184 17185 /** 17186 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17187 * to avoid clearing that flag prematurely. 17188 */ 17189 boolean mSetIgnoreDirtyState = false; 17190 17191 /** 17192 * Indicates whether the view's window is currently in touch mode. 17193 */ 17194 boolean mInTouchMode; 17195 17196 /** 17197 * Indicates that ViewAncestor should trigger a global layout change 17198 * the next time it performs a traversal 17199 */ 17200 boolean mRecomputeGlobalAttributes; 17201 17202 /** 17203 * Always report new attributes at next traversal. 17204 */ 17205 boolean mForceReportNewAttributes; 17206 17207 /** 17208 * Set during a traveral if any views want to keep the screen on. 17209 */ 17210 boolean mKeepScreenOn; 17211 17212 /** 17213 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17214 */ 17215 int mSystemUiVisibility; 17216 17217 /** 17218 * Hack to force certain system UI visibility flags to be cleared. 17219 */ 17220 int mDisabledSystemUiVisibility; 17221 17222 /** 17223 * Last global system UI visibility reported by the window manager. 17224 */ 17225 int mGlobalSystemUiVisibility; 17226 17227 /** 17228 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17229 * attached. 17230 */ 17231 boolean mHasSystemUiListeners; 17232 17233 /** 17234 * Set if the visibility of any views has changed. 17235 */ 17236 boolean mViewVisibilityChanged; 17237 17238 /** 17239 * Set to true if a view has been scrolled. 17240 */ 17241 boolean mViewScrollChanged; 17242 17243 /** 17244 * Global to the view hierarchy used as a temporary for dealing with 17245 * x/y points in the transparent region computations. 17246 */ 17247 final int[] mTransparentLocation = new int[2]; 17248 17249 /** 17250 * Global to the view hierarchy used as a temporary for dealing with 17251 * x/y points in the ViewGroup.invalidateChild implementation. 17252 */ 17253 final int[] mInvalidateChildLocation = new int[2]; 17254 17255 17256 /** 17257 * Global to the view hierarchy used as a temporary for dealing with 17258 * x/y location when view is transformed. 17259 */ 17260 final float[] mTmpTransformLocation = new float[2]; 17261 17262 /** 17263 * The view tree observer used to dispatch global events like 17264 * layout, pre-draw, touch mode change, etc. 17265 */ 17266 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17267 17268 /** 17269 * A Canvas used by the view hierarchy to perform bitmap caching. 17270 */ 17271 Canvas mCanvas; 17272 17273 /** 17274 * The view root impl. 17275 */ 17276 final ViewRootImpl mViewRootImpl; 17277 17278 /** 17279 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17280 * handler can be used to pump events in the UI events queue. 17281 */ 17282 final Handler mHandler; 17283 17284 /** 17285 * Temporary for use in computing invalidate rectangles while 17286 * calling up the hierarchy. 17287 */ 17288 final Rect mTmpInvalRect = new Rect(); 17289 17290 /** 17291 * Temporary for use in computing hit areas with transformed views 17292 */ 17293 final RectF mTmpTransformRect = new RectF(); 17294 17295 /** 17296 * Temporary list for use in collecting focusable descendents of a view. 17297 */ 17298 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17299 17300 /** 17301 * The id of the window for accessibility purposes. 17302 */ 17303 int mAccessibilityWindowId = View.NO_ID; 17304 17305 /** 17306 * Whether to ingore not exposed for accessibility Views when 17307 * reporting the view tree to accessibility services. 17308 */ 17309 boolean mIncludeNotImportantViews; 17310 17311 /** 17312 * The drawable for highlighting accessibility focus. 17313 */ 17314 Drawable mAccessibilityFocusDrawable; 17315 17316 /** 17317 * Show where the margins, bounds and layout bounds are for each view. 17318 */ 17319 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17320 17321 /** 17322 * Point used to compute visible regions. 17323 */ 17324 final Point mPoint = new Point(); 17325 17326 /** 17327 * Creates a new set of attachment information with the specified 17328 * events handler and thread. 17329 * 17330 * @param handler the events handler the view must use 17331 */ 17332 AttachInfo(IWindowSession session, IWindow window, 17333 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17334 mSession = session; 17335 mWindow = window; 17336 mWindowToken = window.asBinder(); 17337 mViewRootImpl = viewRootImpl; 17338 mHandler = handler; 17339 mRootCallbacks = effectPlayer; 17340 } 17341 } 17342 17343 /** 17344 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17345 * is supported. This avoids keeping too many unused fields in most 17346 * instances of View.</p> 17347 */ 17348 private static class ScrollabilityCache implements Runnable { 17349 17350 /** 17351 * Scrollbars are not visible 17352 */ 17353 public static final int OFF = 0; 17354 17355 /** 17356 * Scrollbars are visible 17357 */ 17358 public static final int ON = 1; 17359 17360 /** 17361 * Scrollbars are fading away 17362 */ 17363 public static final int FADING = 2; 17364 17365 public boolean fadeScrollBars; 17366 17367 public int fadingEdgeLength; 17368 public int scrollBarDefaultDelayBeforeFade; 17369 public int scrollBarFadeDuration; 17370 17371 public int scrollBarSize; 17372 public ScrollBarDrawable scrollBar; 17373 public float[] interpolatorValues; 17374 public View host; 17375 17376 public final Paint paint; 17377 public final Matrix matrix; 17378 public Shader shader; 17379 17380 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17381 17382 private static final float[] OPAQUE = { 255 }; 17383 private static final float[] TRANSPARENT = { 0.0f }; 17384 17385 /** 17386 * When fading should start. This time moves into the future every time 17387 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17388 */ 17389 public long fadeStartTime; 17390 17391 17392 /** 17393 * The current state of the scrollbars: ON, OFF, or FADING 17394 */ 17395 public int state = OFF; 17396 17397 private int mLastColor; 17398 17399 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17400 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17401 scrollBarSize = configuration.getScaledScrollBarSize(); 17402 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17403 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17404 17405 paint = new Paint(); 17406 matrix = new Matrix(); 17407 // use use a height of 1, and then wack the matrix each time we 17408 // actually use it. 17409 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17410 17411 paint.setShader(shader); 17412 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17413 this.host = host; 17414 } 17415 17416 public void setFadeColor(int color) { 17417 if (color != 0 && color != mLastColor) { 17418 mLastColor = color; 17419 color |= 0xFF000000; 17420 17421 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17422 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17423 17424 paint.setShader(shader); 17425 // Restore the default transfer mode (src_over) 17426 paint.setXfermode(null); 17427 } 17428 } 17429 17430 public void run() { 17431 long now = AnimationUtils.currentAnimationTimeMillis(); 17432 if (now >= fadeStartTime) { 17433 17434 // the animation fades the scrollbars out by changing 17435 // the opacity (alpha) from fully opaque to fully 17436 // transparent 17437 int nextFrame = (int) now; 17438 int framesCount = 0; 17439 17440 Interpolator interpolator = scrollBarInterpolator; 17441 17442 // Start opaque 17443 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17444 17445 // End transparent 17446 nextFrame += scrollBarFadeDuration; 17447 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17448 17449 state = FADING; 17450 17451 // Kick off the fade animation 17452 host.invalidate(true); 17453 } 17454 } 17455 } 17456 17457 /** 17458 * Resuable callback for sending 17459 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17460 */ 17461 private class SendViewScrolledAccessibilityEvent implements Runnable { 17462 public volatile boolean mIsPending; 17463 17464 public void run() { 17465 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17466 mIsPending = false; 17467 } 17468 } 17469 17470 /** 17471 * <p> 17472 * This class represents a delegate that can be registered in a {@link View} 17473 * to enhance accessibility support via composition rather via inheritance. 17474 * It is specifically targeted to widget developers that extend basic View 17475 * classes i.e. classes in package android.view, that would like their 17476 * applications to be backwards compatible. 17477 * </p> 17478 * <div class="special reference"> 17479 * <h3>Developer Guides</h3> 17480 * <p>For more information about making applications accessible, read the 17481 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17482 * developer guide.</p> 17483 * </div> 17484 * <p> 17485 * A scenario in which a developer would like to use an accessibility delegate 17486 * is overriding a method introduced in a later API version then the minimal API 17487 * version supported by the application. For example, the method 17488 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17489 * in API version 4 when the accessibility APIs were first introduced. If a 17490 * developer would like his application to run on API version 4 devices (assuming 17491 * all other APIs used by the application are version 4 or lower) and take advantage 17492 * of this method, instead of overriding the method which would break the application's 17493 * backwards compatibility, he can override the corresponding method in this 17494 * delegate and register the delegate in the target View if the API version of 17495 * the system is high enough i.e. the API version is same or higher to the API 17496 * version that introduced 17497 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17498 * </p> 17499 * <p> 17500 * Here is an example implementation: 17501 * </p> 17502 * <code><pre><p> 17503 * if (Build.VERSION.SDK_INT >= 14) { 17504 * // If the API version is equal of higher than the version in 17505 * // which onInitializeAccessibilityNodeInfo was introduced we 17506 * // register a delegate with a customized implementation. 17507 * View view = findViewById(R.id.view_id); 17508 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17509 * public void onInitializeAccessibilityNodeInfo(View host, 17510 * AccessibilityNodeInfo info) { 17511 * // Let the default implementation populate the info. 17512 * super.onInitializeAccessibilityNodeInfo(host, info); 17513 * // Set some other information. 17514 * info.setEnabled(host.isEnabled()); 17515 * } 17516 * }); 17517 * } 17518 * </code></pre></p> 17519 * <p> 17520 * This delegate contains methods that correspond to the accessibility methods 17521 * in View. If a delegate has been specified the implementation in View hands 17522 * off handling to the corresponding method in this delegate. The default 17523 * implementation the delegate methods behaves exactly as the corresponding 17524 * method in View for the case of no accessibility delegate been set. Hence, 17525 * to customize the behavior of a View method, clients can override only the 17526 * corresponding delegate method without altering the behavior of the rest 17527 * accessibility related methods of the host view. 17528 * </p> 17529 */ 17530 public static class AccessibilityDelegate { 17531 17532 /** 17533 * Sends an accessibility event of the given type. If accessibility is not 17534 * enabled this method has no effect. 17535 * <p> 17536 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17537 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17538 * been set. 17539 * </p> 17540 * 17541 * @param host The View hosting the delegate. 17542 * @param eventType The type of the event to send. 17543 * 17544 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17545 */ 17546 public void sendAccessibilityEvent(View host, int eventType) { 17547 host.sendAccessibilityEventInternal(eventType); 17548 } 17549 17550 /** 17551 * Performs the specified accessibility action on the view. For 17552 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17553 * <p> 17554 * The default implementation behaves as 17555 * {@link View#performAccessibilityAction(int, Bundle) 17556 * View#performAccessibilityAction(int, Bundle)} for the case of 17557 * no accessibility delegate been set. 17558 * </p> 17559 * 17560 * @param action The action to perform. 17561 * @return Whether the action was performed. 17562 * 17563 * @see View#performAccessibilityAction(int, Bundle) 17564 * View#performAccessibilityAction(int, Bundle) 17565 */ 17566 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17567 return host.performAccessibilityActionInternal(action, args); 17568 } 17569 17570 /** 17571 * Sends an accessibility event. This method behaves exactly as 17572 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17573 * empty {@link AccessibilityEvent} and does not perform a check whether 17574 * accessibility is enabled. 17575 * <p> 17576 * The default implementation behaves as 17577 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17578 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17579 * the case of no accessibility delegate been set. 17580 * </p> 17581 * 17582 * @param host The View hosting the delegate. 17583 * @param event The event to send. 17584 * 17585 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17586 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17587 */ 17588 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17589 host.sendAccessibilityEventUncheckedInternal(event); 17590 } 17591 17592 /** 17593 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17594 * to its children for adding their text content to the event. 17595 * <p> 17596 * The default implementation behaves as 17597 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17598 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17599 * the case of no accessibility delegate been set. 17600 * </p> 17601 * 17602 * @param host The View hosting the delegate. 17603 * @param event The event. 17604 * @return True if the event population was completed. 17605 * 17606 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17607 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17608 */ 17609 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17610 return host.dispatchPopulateAccessibilityEventInternal(event); 17611 } 17612 17613 /** 17614 * Gives a chance to the host View to populate the accessibility event with its 17615 * text content. 17616 * <p> 17617 * The default implementation behaves as 17618 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17619 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17620 * the case of no accessibility delegate been set. 17621 * </p> 17622 * 17623 * @param host The View hosting the delegate. 17624 * @param event The accessibility event which to populate. 17625 * 17626 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17627 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17628 */ 17629 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17630 host.onPopulateAccessibilityEventInternal(event); 17631 } 17632 17633 /** 17634 * Initializes an {@link AccessibilityEvent} with information about the 17635 * the host View which is the event source. 17636 * <p> 17637 * The default implementation behaves as 17638 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17639 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17640 * the case of no accessibility delegate been set. 17641 * </p> 17642 * 17643 * @param host The View hosting the delegate. 17644 * @param event The event to initialize. 17645 * 17646 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17647 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17648 */ 17649 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17650 host.onInitializeAccessibilityEventInternal(event); 17651 } 17652 17653 /** 17654 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17655 * <p> 17656 * The default implementation behaves as 17657 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17658 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17659 * the case of no accessibility delegate been set. 17660 * </p> 17661 * 17662 * @param host The View hosting the delegate. 17663 * @param info The instance to initialize. 17664 * 17665 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17666 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17667 */ 17668 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17669 host.onInitializeAccessibilityNodeInfoInternal(info); 17670 } 17671 17672 /** 17673 * Called when a child of the host View has requested sending an 17674 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17675 * to augment the event. 17676 * <p> 17677 * The default implementation behaves as 17678 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17679 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17680 * the case of no accessibility delegate been set. 17681 * </p> 17682 * 17683 * @param host The View hosting the delegate. 17684 * @param child The child which requests sending the event. 17685 * @param event The event to be sent. 17686 * @return True if the event should be sent 17687 * 17688 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17689 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17690 */ 17691 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17692 AccessibilityEvent event) { 17693 return host.onRequestSendAccessibilityEventInternal(child, event); 17694 } 17695 17696 /** 17697 * Gets the provider for managing a virtual view hierarchy rooted at this View 17698 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17699 * that explore the window content. 17700 * <p> 17701 * The default implementation behaves as 17702 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17703 * the case of no accessibility delegate been set. 17704 * </p> 17705 * 17706 * @return The provider. 17707 * 17708 * @see AccessibilityNodeProvider 17709 */ 17710 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17711 return null; 17712 } 17713 } 17714} 17715