View.java revision 88b2b90e7d79292229ca92b6bf416bfe61092fb1
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 && focusHost != this 6143 && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6144 viewRootImpl.setAccessibilityFocusedHost(null); 6145 } 6146 } 6147 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6148 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6149 invalidate(); 6150 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6151 notifyAccessibilityStateChanged(); 6152 6153 // Clear the text navigation state. 6154 setAccessibilityCursorPosition(-1); 6155 6156 // Try to move accessibility focus to the input focus. 6157 View rootView = getRootView(); 6158 if (rootView != null) { 6159 View inputFocus = rootView.findFocus(); 6160 if (inputFocus != null) { 6161 inputFocus.requestAccessibilityFocus(); 6162 } 6163 } 6164 } 6165 } 6166 6167 private void requestAccessibilityFocusFromHover() { 6168 if (includeForAccessibility() && isActionableForAccessibility()) { 6169 requestAccessibilityFocus(); 6170 } else { 6171 if (mParent != null) { 6172 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6173 if (nextFocus != null) { 6174 nextFocus.requestAccessibilityFocus(); 6175 } 6176 } 6177 } 6178 } 6179 6180 /** 6181 * @hide 6182 */ 6183 public boolean canTakeAccessibilityFocusFromHover() { 6184 if (includeForAccessibility() && isActionableForAccessibility()) { 6185 return true; 6186 } 6187 if (mParent != null) { 6188 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6189 } 6190 return false; 6191 } 6192 6193 /** 6194 * Clears accessibility focus without calling any callback methods 6195 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6196 * is used for clearing accessibility focus when giving this focus to 6197 * another view. 6198 */ 6199 void clearAccessibilityFocusNoCallbacks() { 6200 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6201 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6202 invalidate(); 6203 } 6204 } 6205 6206 /** 6207 * Call this to try to give focus to a specific view or to one of its 6208 * descendants. 6209 * 6210 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6211 * false), or if it is focusable and it is not focusable in touch mode 6212 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6213 * 6214 * See also {@link #focusSearch(int)}, which is what you call to say that you 6215 * have focus, and you want your parent to look for the next one. 6216 * 6217 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6218 * {@link #FOCUS_DOWN} and <code>null</code>. 6219 * 6220 * @return Whether this view or one of its descendants actually took focus. 6221 */ 6222 public final boolean requestFocus() { 6223 return requestFocus(View.FOCUS_DOWN); 6224 } 6225 6226 /** 6227 * Call this to try to give focus to a specific view or to one of its 6228 * descendants and give it a hint about what direction focus is heading. 6229 * 6230 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6231 * false), or if it is focusable and it is not focusable in touch mode 6232 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6233 * 6234 * See also {@link #focusSearch(int)}, which is what you call to say that you 6235 * have focus, and you want your parent to look for the next one. 6236 * 6237 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6238 * <code>null</code> set for the previously focused rectangle. 6239 * 6240 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6241 * @return Whether this view or one of its descendants actually took focus. 6242 */ 6243 public final boolean requestFocus(int direction) { 6244 return requestFocus(direction, null); 6245 } 6246 6247 /** 6248 * Call this to try to give focus to a specific view or to one of its descendants 6249 * and give it hints about the direction and a specific rectangle that the focus 6250 * is coming from. The rectangle can help give larger views a finer grained hint 6251 * about where focus is coming from, and therefore, where to show selection, or 6252 * forward focus change internally. 6253 * 6254 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6255 * false), or if it is focusable and it is not focusable in touch mode 6256 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6257 * 6258 * A View will not take focus if it is not visible. 6259 * 6260 * A View will not take focus if one of its parents has 6261 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6262 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6263 * 6264 * See also {@link #focusSearch(int)}, which is what you call to say that you 6265 * have focus, and you want your parent to look for the next one. 6266 * 6267 * You may wish to override this method if your custom {@link View} has an internal 6268 * {@link View} that it wishes to forward the request to. 6269 * 6270 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6271 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6272 * to give a finer grained hint about where focus is coming from. May be null 6273 * if there is no hint. 6274 * @return Whether this view or one of its descendants actually took focus. 6275 */ 6276 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6277 return requestFocusNoSearch(direction, previouslyFocusedRect); 6278 } 6279 6280 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6281 // need to be focusable 6282 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6283 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6284 return false; 6285 } 6286 6287 // need to be focusable in touch mode if in touch mode 6288 if (isInTouchMode() && 6289 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6290 return false; 6291 } 6292 6293 // need to not have any parents blocking us 6294 if (hasAncestorThatBlocksDescendantFocus()) { 6295 return false; 6296 } 6297 6298 handleFocusGainInternal(direction, previouslyFocusedRect); 6299 return true; 6300 } 6301 6302 /** 6303 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6304 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6305 * touch mode to request focus when they are touched. 6306 * 6307 * @return Whether this view or one of its descendants actually took focus. 6308 * 6309 * @see #isInTouchMode() 6310 * 6311 */ 6312 public final boolean requestFocusFromTouch() { 6313 // Leave touch mode if we need to 6314 if (isInTouchMode()) { 6315 ViewRootImpl viewRoot = getViewRootImpl(); 6316 if (viewRoot != null) { 6317 viewRoot.ensureTouchMode(false); 6318 } 6319 } 6320 return requestFocus(View.FOCUS_DOWN); 6321 } 6322 6323 /** 6324 * @return Whether any ancestor of this view blocks descendant focus. 6325 */ 6326 private boolean hasAncestorThatBlocksDescendantFocus() { 6327 ViewParent ancestor = mParent; 6328 while (ancestor instanceof ViewGroup) { 6329 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6330 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6331 return true; 6332 } else { 6333 ancestor = vgAncestor.getParent(); 6334 } 6335 } 6336 return false; 6337 } 6338 6339 /** 6340 * Gets the mode for determining whether this View is important for accessibility 6341 * which is if it fires accessibility events and if it is reported to 6342 * accessibility services that query the screen. 6343 * 6344 * @return The mode for determining whether a View is important for accessibility. 6345 * 6346 * @attr ref android.R.styleable#View_importantForAccessibility 6347 * 6348 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6349 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6350 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6351 */ 6352 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6353 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6354 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6355 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6356 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6357 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6358 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6359 }) 6360 public int getImportantForAccessibility() { 6361 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6362 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6363 } 6364 6365 /** 6366 * Sets how to determine whether this view is important for accessibility 6367 * which is if it fires accessibility events and if it is reported to 6368 * accessibility services that query the screen. 6369 * 6370 * @param mode How to determine whether this view is important for accessibility. 6371 * 6372 * @attr ref android.R.styleable#View_importantForAccessibility 6373 * 6374 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6375 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6376 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6377 */ 6378 public void setImportantForAccessibility(int mode) { 6379 if (mode != getImportantForAccessibility()) { 6380 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6381 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6382 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6383 notifyAccessibilityStateChanged(); 6384 } 6385 } 6386 6387 /** 6388 * Gets whether this view should be exposed for accessibility. 6389 * 6390 * @return Whether the view is exposed for accessibility. 6391 * 6392 * @hide 6393 */ 6394 public boolean isImportantForAccessibility() { 6395 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6396 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6397 switch (mode) { 6398 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6399 return true; 6400 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6401 return false; 6402 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6403 return isActionableForAccessibility() || hasListenersForAccessibility(); 6404 default: 6405 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6406 + mode); 6407 } 6408 } 6409 6410 /** 6411 * Gets the parent for accessibility purposes. Note that the parent for 6412 * accessibility is not necessary the immediate parent. It is the first 6413 * predecessor that is important for accessibility. 6414 * 6415 * @return The parent for accessibility purposes. 6416 */ 6417 public ViewParent getParentForAccessibility() { 6418 if (mParent instanceof View) { 6419 View parentView = (View) mParent; 6420 if (parentView.includeForAccessibility()) { 6421 return mParent; 6422 } else { 6423 return mParent.getParentForAccessibility(); 6424 } 6425 } 6426 return null; 6427 } 6428 6429 /** 6430 * Adds the children of a given View for accessibility. Since some Views are 6431 * not important for accessibility the children for accessibility are not 6432 * necessarily direct children of the riew, rather they are the first level of 6433 * descendants important for accessibility. 6434 * 6435 * @param children The list of children for accessibility. 6436 */ 6437 public void addChildrenForAccessibility(ArrayList<View> children) { 6438 if (includeForAccessibility()) { 6439 children.add(this); 6440 } 6441 } 6442 6443 /** 6444 * Whether to regard this view for accessibility. A view is regarded for 6445 * accessibility if it is important for accessibility or the querying 6446 * accessibility service has explicitly requested that view not 6447 * important for accessibility are regarded. 6448 * 6449 * @return Whether to regard the view for accessibility. 6450 * 6451 * @hide 6452 */ 6453 public boolean includeForAccessibility() { 6454 if (mAttachInfo != null) { 6455 if (!mAttachInfo.mIncludeNotImportantViews) { 6456 return isImportantForAccessibility(); 6457 } 6458 return true; 6459 } 6460 return false; 6461 } 6462 6463 /** 6464 * Returns whether the View is considered actionable from 6465 * accessibility perspective. Such view are important for 6466 * accessiiblity. 6467 * 6468 * @return True if the view is actionable for accessibility. 6469 * 6470 * @hide 6471 */ 6472 public boolean isActionableForAccessibility() { 6473 return (isClickable() || isLongClickable() || isFocusable()); 6474 } 6475 6476 /** 6477 * Returns whether the View has registered callbacks wich makes it 6478 * important for accessiiblity. 6479 * 6480 * @return True if the view is actionable for accessibility. 6481 */ 6482 private boolean hasListenersForAccessibility() { 6483 ListenerInfo info = getListenerInfo(); 6484 return mTouchDelegate != null || info.mOnKeyListener != null 6485 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6486 || info.mOnHoverListener != null || info.mOnDragListener != null; 6487 } 6488 6489 /** 6490 * Notifies accessibility services that some view's important for 6491 * accessibility state has changed. Note that such notifications 6492 * are made at most once every 6493 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6494 * to avoid unnecessary load to the system. Also once a view has 6495 * made a notifucation this method is a NOP until the notification has 6496 * been sent to clients. 6497 * 6498 * @hide 6499 * 6500 * TODO: Makse sure this method is called for any view state change 6501 * that is interesting for accessilility purposes. 6502 */ 6503 public void notifyAccessibilityStateChanged() { 6504 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6505 return; 6506 } 6507 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6508 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6509 if (mParent != null) { 6510 mParent.childAccessibilityStateChanged(this); 6511 } 6512 } 6513 } 6514 6515 /** 6516 * Reset the state indicating the this view has requested clients 6517 * interested in its accessiblity state to be notified. 6518 * 6519 * @hide 6520 */ 6521 public void resetAccessibilityStateChanged() { 6522 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6523 } 6524 6525 /** 6526 * Performs the specified accessibility action on the view. For 6527 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6528 * <p> 6529 * If an {@link AccessibilityDelegate} has been specified via calling 6530 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6531 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6532 * is responsible for handling this call. 6533 * </p> 6534 * 6535 * @param action The action to perform. 6536 * @param arguments Optional action arguments. 6537 * @return Whether the action was performed. 6538 */ 6539 public boolean performAccessibilityAction(int action, Bundle arguments) { 6540 if (mAccessibilityDelegate != null) { 6541 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6542 } else { 6543 return performAccessibilityActionInternal(action, arguments); 6544 } 6545 } 6546 6547 /** 6548 * @see #performAccessibilityAction(int, Bundle) 6549 * 6550 * Note: Called from the default {@link AccessibilityDelegate}. 6551 */ 6552 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6553 switch (action) { 6554 case AccessibilityNodeInfo.ACTION_CLICK: { 6555 if (isClickable()) { 6556 return performClick(); 6557 } 6558 } break; 6559 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6560 if (isLongClickable()) { 6561 return performLongClick(); 6562 } 6563 } break; 6564 case AccessibilityNodeInfo.ACTION_FOCUS: { 6565 if (!hasFocus()) { 6566 // Get out of touch mode since accessibility 6567 // wants to move focus around. 6568 getViewRootImpl().ensureTouchMode(false); 6569 return requestFocus(); 6570 } 6571 } break; 6572 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6573 if (hasFocus()) { 6574 clearFocus(); 6575 return !isFocused(); 6576 } 6577 } break; 6578 case AccessibilityNodeInfo.ACTION_SELECT: { 6579 if (!isSelected()) { 6580 setSelected(true); 6581 return isSelected(); 6582 } 6583 } break; 6584 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6585 if (isSelected()) { 6586 setSelected(false); 6587 return !isSelected(); 6588 } 6589 } break; 6590 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6591 if (!isAccessibilityFocused()) { 6592 return requestAccessibilityFocus(); 6593 } 6594 } break; 6595 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6596 if (isAccessibilityFocused()) { 6597 clearAccessibilityFocus(); 6598 return true; 6599 } 6600 } break; 6601 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6602 if (arguments != null) { 6603 final int granularity = arguments.getInt( 6604 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6605 return nextAtGranularity(granularity); 6606 } 6607 } break; 6608 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6609 if (arguments != null) { 6610 final int granularity = arguments.getInt( 6611 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6612 return previousAtGranularity(granularity); 6613 } 6614 } break; 6615 } 6616 return false; 6617 } 6618 6619 private boolean nextAtGranularity(int granularity) { 6620 CharSequence text = getIterableTextForAccessibility(); 6621 if (text == null || text.length() == 0) { 6622 return false; 6623 } 6624 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6625 if (iterator == null) { 6626 return false; 6627 } 6628 final int current = getAccessibilityCursorPosition(); 6629 final int[] range = iterator.following(current); 6630 if (range == null) { 6631 setAccessibilityCursorPosition(-1); 6632 return false; 6633 } 6634 final int start = range[0]; 6635 final int end = range[1]; 6636 setAccessibilityCursorPosition(start); 6637 sendViewTextTraversedAtGranularityEvent( 6638 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6639 granularity, start, end); 6640 return true; 6641 } 6642 6643 private boolean previousAtGranularity(int granularity) { 6644 CharSequence text = getIterableTextForAccessibility(); 6645 if (text == null || text.length() == 0) { 6646 return false; 6647 } 6648 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6649 if (iterator == null) { 6650 return false; 6651 } 6652 final int selectionStart = getAccessibilityCursorPosition(); 6653 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6654 final int[] range = iterator.preceding(current); 6655 if (range == null) { 6656 setAccessibilityCursorPosition(-1); 6657 return false; 6658 } 6659 final int start = range[0]; 6660 final int end = range[1]; 6661 setAccessibilityCursorPosition(end); 6662 sendViewTextTraversedAtGranularityEvent( 6663 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6664 granularity, start, end); 6665 return true; 6666 } 6667 6668 /** 6669 * Gets the text reported for accessibility purposes. 6670 * 6671 * @return The accessibility text. 6672 * 6673 * @hide 6674 */ 6675 public CharSequence getIterableTextForAccessibility() { 6676 return mContentDescription; 6677 } 6678 6679 /** 6680 * @hide 6681 */ 6682 public int getAccessibilityCursorPosition() { 6683 return mAccessibilityCursorPosition; 6684 } 6685 6686 /** 6687 * @hide 6688 */ 6689 public void setAccessibilityCursorPosition(int position) { 6690 mAccessibilityCursorPosition = position; 6691 } 6692 6693 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6694 int fromIndex, int toIndex) { 6695 if (mParent == null) { 6696 return; 6697 } 6698 AccessibilityEvent event = AccessibilityEvent.obtain( 6699 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6700 onInitializeAccessibilityEvent(event); 6701 onPopulateAccessibilityEvent(event); 6702 event.setFromIndex(fromIndex); 6703 event.setToIndex(toIndex); 6704 event.setAction(action); 6705 event.setMovementGranularity(granularity); 6706 mParent.requestSendAccessibilityEvent(this, event); 6707 } 6708 6709 /** 6710 * @hide 6711 */ 6712 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6713 switch (granularity) { 6714 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6715 CharSequence text = getIterableTextForAccessibility(); 6716 if (text != null && text.length() > 0) { 6717 CharacterTextSegmentIterator iterator = 6718 CharacterTextSegmentIterator.getInstance(mContext); 6719 iterator.initialize(text.toString()); 6720 return iterator; 6721 } 6722 } break; 6723 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6724 CharSequence text = getIterableTextForAccessibility(); 6725 if (text != null && text.length() > 0) { 6726 WordTextSegmentIterator iterator = 6727 WordTextSegmentIterator.getInstance(mContext); 6728 iterator.initialize(text.toString()); 6729 return iterator; 6730 } 6731 } break; 6732 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6733 CharSequence text = getIterableTextForAccessibility(); 6734 if (text != null && text.length() > 0) { 6735 ParagraphTextSegmentIterator iterator = 6736 ParagraphTextSegmentIterator.getInstance(); 6737 iterator.initialize(text.toString()); 6738 return iterator; 6739 } 6740 } break; 6741 } 6742 return null; 6743 } 6744 6745 /** 6746 * @hide 6747 */ 6748 public void dispatchStartTemporaryDetach() { 6749 clearAccessibilityFocus(); 6750 onStartTemporaryDetach(); 6751 } 6752 6753 /** 6754 * This is called when a container is going to temporarily detach a child, with 6755 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6756 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6757 * {@link #onDetachedFromWindow()} when the container is done. 6758 */ 6759 public void onStartTemporaryDetach() { 6760 removeUnsetPressCallback(); 6761 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6762 } 6763 6764 /** 6765 * @hide 6766 */ 6767 public void dispatchFinishTemporaryDetach() { 6768 onFinishTemporaryDetach(); 6769 } 6770 6771 /** 6772 * Called after {@link #onStartTemporaryDetach} when the container is done 6773 * changing the view. 6774 */ 6775 public void onFinishTemporaryDetach() { 6776 } 6777 6778 /** 6779 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6780 * for this view's window. Returns null if the view is not currently attached 6781 * to the window. Normally you will not need to use this directly, but 6782 * just use the standard high-level event callbacks like 6783 * {@link #onKeyDown(int, KeyEvent)}. 6784 */ 6785 public KeyEvent.DispatcherState getKeyDispatcherState() { 6786 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6787 } 6788 6789 /** 6790 * Dispatch a key event before it is processed by any input method 6791 * associated with the view hierarchy. This can be used to intercept 6792 * key events in special situations before the IME consumes them; a 6793 * typical example would be handling the BACK key to update the application's 6794 * UI instead of allowing the IME to see it and close itself. 6795 * 6796 * @param event The key event to be dispatched. 6797 * @return True if the event was handled, false otherwise. 6798 */ 6799 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6800 return onKeyPreIme(event.getKeyCode(), event); 6801 } 6802 6803 /** 6804 * Dispatch a key event to the next view on the focus path. This path runs 6805 * from the top of the view tree down to the currently focused view. If this 6806 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6807 * the next node down the focus path. This method also fires any key 6808 * listeners. 6809 * 6810 * @param event The key event to be dispatched. 6811 * @return True if the event was handled, false otherwise. 6812 */ 6813 public boolean dispatchKeyEvent(KeyEvent event) { 6814 if (mInputEventConsistencyVerifier != null) { 6815 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6816 } 6817 6818 // Give any attached key listener a first crack at the event. 6819 //noinspection SimplifiableIfStatement 6820 ListenerInfo li = mListenerInfo; 6821 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6822 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6823 return true; 6824 } 6825 6826 if (event.dispatch(this, mAttachInfo != null 6827 ? mAttachInfo.mKeyDispatchState : null, this)) { 6828 return true; 6829 } 6830 6831 if (mInputEventConsistencyVerifier != null) { 6832 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6833 } 6834 return false; 6835 } 6836 6837 /** 6838 * Dispatches a key shortcut event. 6839 * 6840 * @param event The key event to be dispatched. 6841 * @return True if the event was handled by the view, false otherwise. 6842 */ 6843 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6844 return onKeyShortcut(event.getKeyCode(), event); 6845 } 6846 6847 /** 6848 * Pass the touch screen motion event down to the target view, or this 6849 * view if it is the target. 6850 * 6851 * @param event The motion event to be dispatched. 6852 * @return True if the event was handled by the view, false otherwise. 6853 */ 6854 public boolean dispatchTouchEvent(MotionEvent event) { 6855 if (mInputEventConsistencyVerifier != null) { 6856 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6857 } 6858 6859 if (onFilterTouchEventForSecurity(event)) { 6860 //noinspection SimplifiableIfStatement 6861 ListenerInfo li = mListenerInfo; 6862 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6863 && li.mOnTouchListener.onTouch(this, event)) { 6864 return true; 6865 } 6866 6867 if (onTouchEvent(event)) { 6868 return true; 6869 } 6870 } 6871 6872 if (mInputEventConsistencyVerifier != null) { 6873 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6874 } 6875 return false; 6876 } 6877 6878 /** 6879 * Filter the touch event to apply security policies. 6880 * 6881 * @param event The motion event to be filtered. 6882 * @return True if the event should be dispatched, false if the event should be dropped. 6883 * 6884 * @see #getFilterTouchesWhenObscured 6885 */ 6886 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6887 //noinspection RedundantIfStatement 6888 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6889 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6890 // Window is obscured, drop this touch. 6891 return false; 6892 } 6893 return true; 6894 } 6895 6896 /** 6897 * Pass a trackball motion event down to the focused view. 6898 * 6899 * @param event The motion event to be dispatched. 6900 * @return True if the event was handled by the view, false otherwise. 6901 */ 6902 public boolean dispatchTrackballEvent(MotionEvent event) { 6903 if (mInputEventConsistencyVerifier != null) { 6904 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6905 } 6906 6907 return onTrackballEvent(event); 6908 } 6909 6910 /** 6911 * Dispatch a generic motion event. 6912 * <p> 6913 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6914 * are delivered to the view under the pointer. All other generic motion events are 6915 * delivered to the focused view. Hover events are handled specially and are delivered 6916 * to {@link #onHoverEvent(MotionEvent)}. 6917 * </p> 6918 * 6919 * @param event The motion event to be dispatched. 6920 * @return True if the event was handled by the view, false otherwise. 6921 */ 6922 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6923 if (mInputEventConsistencyVerifier != null) { 6924 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6925 } 6926 6927 final int source = event.getSource(); 6928 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6929 final int action = event.getAction(); 6930 if (action == MotionEvent.ACTION_HOVER_ENTER 6931 || action == MotionEvent.ACTION_HOVER_MOVE 6932 || action == MotionEvent.ACTION_HOVER_EXIT) { 6933 if (dispatchHoverEvent(event)) { 6934 return true; 6935 } 6936 } else if (dispatchGenericPointerEvent(event)) { 6937 return true; 6938 } 6939 } else if (dispatchGenericFocusedEvent(event)) { 6940 return true; 6941 } 6942 6943 if (dispatchGenericMotionEventInternal(event)) { 6944 return true; 6945 } 6946 6947 if (mInputEventConsistencyVerifier != null) { 6948 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6949 } 6950 return false; 6951 } 6952 6953 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6954 //noinspection SimplifiableIfStatement 6955 ListenerInfo li = mListenerInfo; 6956 if (li != null && li.mOnGenericMotionListener != null 6957 && (mViewFlags & ENABLED_MASK) == ENABLED 6958 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6959 return true; 6960 } 6961 6962 if (onGenericMotionEvent(event)) { 6963 return true; 6964 } 6965 6966 if (mInputEventConsistencyVerifier != null) { 6967 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6968 } 6969 return false; 6970 } 6971 6972 /** 6973 * Dispatch a hover event. 6974 * <p> 6975 * Do not call this method directly. 6976 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6977 * </p> 6978 * 6979 * @param event The motion event to be dispatched. 6980 * @return True if the event was handled by the view, false otherwise. 6981 */ 6982 protected boolean dispatchHoverEvent(MotionEvent event) { 6983 //noinspection SimplifiableIfStatement 6984 ListenerInfo li = mListenerInfo; 6985 if (li != null && li.mOnHoverListener != null 6986 && (mViewFlags & ENABLED_MASK) == ENABLED 6987 && li.mOnHoverListener.onHover(this, event)) { 6988 return true; 6989 } 6990 6991 return onHoverEvent(event); 6992 } 6993 6994 /** 6995 * Returns true if the view has a child to which it has recently sent 6996 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6997 * it does not have a hovered child, then it must be the innermost hovered view. 6998 * @hide 6999 */ 7000 protected boolean hasHoveredChild() { 7001 return false; 7002 } 7003 7004 /** 7005 * Dispatch a generic motion event to the view under the first pointer. 7006 * <p> 7007 * Do not call this method directly. 7008 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7009 * </p> 7010 * 7011 * @param event The motion event to be dispatched. 7012 * @return True if the event was handled by the view, false otherwise. 7013 */ 7014 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7015 return false; 7016 } 7017 7018 /** 7019 * Dispatch a generic motion event to the currently focused view. 7020 * <p> 7021 * Do not call this method directly. 7022 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7023 * </p> 7024 * 7025 * @param event The motion event to be dispatched. 7026 * @return True if the event was handled by the view, false otherwise. 7027 */ 7028 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7029 return false; 7030 } 7031 7032 /** 7033 * Dispatch a pointer event. 7034 * <p> 7035 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7036 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7037 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7038 * and should not be expected to handle other pointing device features. 7039 * </p> 7040 * 7041 * @param event The motion event to be dispatched. 7042 * @return True if the event was handled by the view, false otherwise. 7043 * @hide 7044 */ 7045 public final boolean dispatchPointerEvent(MotionEvent event) { 7046 if (event.isTouchEvent()) { 7047 return dispatchTouchEvent(event); 7048 } else { 7049 return dispatchGenericMotionEvent(event); 7050 } 7051 } 7052 7053 /** 7054 * Called when the window containing this view gains or loses window focus. 7055 * ViewGroups should override to route to their children. 7056 * 7057 * @param hasFocus True if the window containing this view now has focus, 7058 * false otherwise. 7059 */ 7060 public void dispatchWindowFocusChanged(boolean hasFocus) { 7061 onWindowFocusChanged(hasFocus); 7062 } 7063 7064 /** 7065 * Called when the window containing this view gains or loses focus. Note 7066 * that this is separate from view focus: to receive key events, both 7067 * your view and its window must have focus. If a window is displayed 7068 * on top of yours that takes input focus, then your own window will lose 7069 * focus but the view focus will remain unchanged. 7070 * 7071 * @param hasWindowFocus True if the window containing this view now has 7072 * focus, false otherwise. 7073 */ 7074 public void onWindowFocusChanged(boolean hasWindowFocus) { 7075 InputMethodManager imm = InputMethodManager.peekInstance(); 7076 if (!hasWindowFocus) { 7077 if (isPressed()) { 7078 setPressed(false); 7079 } 7080 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7081 imm.focusOut(this); 7082 } 7083 removeLongPressCallback(); 7084 removeTapCallback(); 7085 onFocusLost(); 7086 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7087 imm.focusIn(this); 7088 } 7089 refreshDrawableState(); 7090 } 7091 7092 /** 7093 * Returns true if this view is in a window that currently has window focus. 7094 * Note that this is not the same as the view itself having focus. 7095 * 7096 * @return True if this view is in a window that currently has window focus. 7097 */ 7098 public boolean hasWindowFocus() { 7099 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7100 } 7101 7102 /** 7103 * Dispatch a view visibility change down the view hierarchy. 7104 * ViewGroups should override to route to their children. 7105 * @param changedView The view whose visibility changed. Could be 'this' or 7106 * an ancestor view. 7107 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7108 * {@link #INVISIBLE} or {@link #GONE}. 7109 */ 7110 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7111 onVisibilityChanged(changedView, visibility); 7112 } 7113 7114 /** 7115 * Called when the visibility of the view or an ancestor of the view is changed. 7116 * @param changedView The view whose visibility changed. Could be 'this' or 7117 * an ancestor view. 7118 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7119 * {@link #INVISIBLE} or {@link #GONE}. 7120 */ 7121 protected void onVisibilityChanged(View changedView, int visibility) { 7122 if (visibility == VISIBLE) { 7123 if (mAttachInfo != null) { 7124 initialAwakenScrollBars(); 7125 } else { 7126 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7127 } 7128 } 7129 } 7130 7131 /** 7132 * Dispatch a hint about whether this view is displayed. For instance, when 7133 * a View moves out of the screen, it might receives a display hint indicating 7134 * the view is not displayed. Applications should not <em>rely</em> on this hint 7135 * as there is no guarantee that they will receive one. 7136 * 7137 * @param hint A hint about whether or not this view is displayed: 7138 * {@link #VISIBLE} or {@link #INVISIBLE}. 7139 */ 7140 public void dispatchDisplayHint(int hint) { 7141 onDisplayHint(hint); 7142 } 7143 7144 /** 7145 * Gives this view a hint about whether is displayed or not. For instance, when 7146 * a View moves out of the screen, it might receives a display hint indicating 7147 * the view is not displayed. Applications should not <em>rely</em> on this hint 7148 * as there is no guarantee that they will receive one. 7149 * 7150 * @param hint A hint about whether or not this view is displayed: 7151 * {@link #VISIBLE} or {@link #INVISIBLE}. 7152 */ 7153 protected void onDisplayHint(int hint) { 7154 } 7155 7156 /** 7157 * Dispatch a window visibility change down the view hierarchy. 7158 * ViewGroups should override to route to their children. 7159 * 7160 * @param visibility The new visibility of the window. 7161 * 7162 * @see #onWindowVisibilityChanged(int) 7163 */ 7164 public void dispatchWindowVisibilityChanged(int visibility) { 7165 onWindowVisibilityChanged(visibility); 7166 } 7167 7168 /** 7169 * Called when the window containing has change its visibility 7170 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7171 * that this tells you whether or not your window is being made visible 7172 * to the window manager; this does <em>not</em> tell you whether or not 7173 * your window is obscured by other windows on the screen, even if it 7174 * is itself visible. 7175 * 7176 * @param visibility The new visibility of the window. 7177 */ 7178 protected void onWindowVisibilityChanged(int visibility) { 7179 if (visibility == VISIBLE) { 7180 initialAwakenScrollBars(); 7181 } 7182 } 7183 7184 /** 7185 * Returns the current visibility of the window this view is attached to 7186 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7187 * 7188 * @return Returns the current visibility of the view's window. 7189 */ 7190 public int getWindowVisibility() { 7191 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7192 } 7193 7194 /** 7195 * Retrieve the overall visible display size in which the window this view is 7196 * attached to has been positioned in. This takes into account screen 7197 * decorations above the window, for both cases where the window itself 7198 * is being position inside of them or the window is being placed under 7199 * then and covered insets are used for the window to position its content 7200 * inside. In effect, this tells you the available area where content can 7201 * be placed and remain visible to users. 7202 * 7203 * <p>This function requires an IPC back to the window manager to retrieve 7204 * the requested information, so should not be used in performance critical 7205 * code like drawing. 7206 * 7207 * @param outRect Filled in with the visible display frame. If the view 7208 * is not attached to a window, this is simply the raw display size. 7209 */ 7210 public void getWindowVisibleDisplayFrame(Rect outRect) { 7211 if (mAttachInfo != null) { 7212 try { 7213 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7214 } catch (RemoteException e) { 7215 return; 7216 } 7217 // XXX This is really broken, and probably all needs to be done 7218 // in the window manager, and we need to know more about whether 7219 // we want the area behind or in front of the IME. 7220 final Rect insets = mAttachInfo.mVisibleInsets; 7221 outRect.left += insets.left; 7222 outRect.top += insets.top; 7223 outRect.right -= insets.right; 7224 outRect.bottom -= insets.bottom; 7225 return; 7226 } 7227 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7228 d.getRectSize(outRect); 7229 } 7230 7231 /** 7232 * Dispatch a notification about a resource configuration change down 7233 * the view hierarchy. 7234 * ViewGroups should override to route to their children. 7235 * 7236 * @param newConfig The new resource configuration. 7237 * 7238 * @see #onConfigurationChanged(android.content.res.Configuration) 7239 */ 7240 public void dispatchConfigurationChanged(Configuration newConfig) { 7241 onConfigurationChanged(newConfig); 7242 } 7243 7244 /** 7245 * Called when the current configuration of the resources being used 7246 * by the application have changed. You can use this to decide when 7247 * to reload resources that can changed based on orientation and other 7248 * configuration characterstics. You only need to use this if you are 7249 * not relying on the normal {@link android.app.Activity} mechanism of 7250 * recreating the activity instance upon a configuration change. 7251 * 7252 * @param newConfig The new resource configuration. 7253 */ 7254 protected void onConfigurationChanged(Configuration newConfig) { 7255 } 7256 7257 /** 7258 * Private function to aggregate all per-view attributes in to the view 7259 * root. 7260 */ 7261 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7262 performCollectViewAttributes(attachInfo, visibility); 7263 } 7264 7265 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7266 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7267 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7268 attachInfo.mKeepScreenOn = true; 7269 } 7270 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7271 ListenerInfo li = mListenerInfo; 7272 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7273 attachInfo.mHasSystemUiListeners = true; 7274 } 7275 } 7276 } 7277 7278 void needGlobalAttributesUpdate(boolean force) { 7279 final AttachInfo ai = mAttachInfo; 7280 if (ai != null) { 7281 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7282 || ai.mHasSystemUiListeners) { 7283 ai.mRecomputeGlobalAttributes = true; 7284 } 7285 } 7286 } 7287 7288 /** 7289 * Returns whether the device is currently in touch mode. Touch mode is entered 7290 * once the user begins interacting with the device by touch, and affects various 7291 * things like whether focus is always visible to the user. 7292 * 7293 * @return Whether the device is in touch mode. 7294 */ 7295 @ViewDebug.ExportedProperty 7296 public boolean isInTouchMode() { 7297 if (mAttachInfo != null) { 7298 return mAttachInfo.mInTouchMode; 7299 } else { 7300 return ViewRootImpl.isInTouchMode(); 7301 } 7302 } 7303 7304 /** 7305 * Returns the context the view is running in, through which it can 7306 * access the current theme, resources, etc. 7307 * 7308 * @return The view's Context. 7309 */ 7310 @ViewDebug.CapturedViewProperty 7311 public final Context getContext() { 7312 return mContext; 7313 } 7314 7315 /** 7316 * Handle a key event before it is processed by any input method 7317 * associated with the view hierarchy. This can be used to intercept 7318 * key events in special situations before the IME consumes them; a 7319 * typical example would be handling the BACK key to update the application's 7320 * UI instead of allowing the IME to see it and close itself. 7321 * 7322 * @param keyCode The value in event.getKeyCode(). 7323 * @param event Description of the key event. 7324 * @return If you handled the event, return true. If you want to allow the 7325 * event to be handled by the next receiver, return false. 7326 */ 7327 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7328 return false; 7329 } 7330 7331 /** 7332 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7333 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7334 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7335 * is released, if the view is enabled and clickable. 7336 * 7337 * @param keyCode A key code that represents the button pressed, from 7338 * {@link android.view.KeyEvent}. 7339 * @param event The KeyEvent object that defines the button action. 7340 */ 7341 public boolean onKeyDown(int keyCode, KeyEvent event) { 7342 boolean result = false; 7343 7344 switch (keyCode) { 7345 case KeyEvent.KEYCODE_DPAD_CENTER: 7346 case KeyEvent.KEYCODE_ENTER: { 7347 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7348 return true; 7349 } 7350 // Long clickable items don't necessarily have to be clickable 7351 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7352 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7353 (event.getRepeatCount() == 0)) { 7354 setPressed(true); 7355 checkForLongClick(0); 7356 return true; 7357 } 7358 break; 7359 } 7360 } 7361 return result; 7362 } 7363 7364 /** 7365 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7366 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7367 * the event). 7368 */ 7369 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7370 return false; 7371 } 7372 7373 /** 7374 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7375 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7376 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7377 * {@link KeyEvent#KEYCODE_ENTER} is released. 7378 * 7379 * @param keyCode A key code that represents the button pressed, from 7380 * {@link android.view.KeyEvent}. 7381 * @param event The KeyEvent object that defines the button action. 7382 */ 7383 public boolean onKeyUp(int keyCode, KeyEvent event) { 7384 boolean result = false; 7385 7386 switch (keyCode) { 7387 case KeyEvent.KEYCODE_DPAD_CENTER: 7388 case KeyEvent.KEYCODE_ENTER: { 7389 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7390 return true; 7391 } 7392 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7393 setPressed(false); 7394 7395 if (!mHasPerformedLongPress) { 7396 // This is a tap, so remove the longpress check 7397 removeLongPressCallback(); 7398 7399 result = performClick(); 7400 } 7401 } 7402 break; 7403 } 7404 } 7405 return result; 7406 } 7407 7408 /** 7409 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7410 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7411 * the event). 7412 * 7413 * @param keyCode A key code that represents the button pressed, from 7414 * {@link android.view.KeyEvent}. 7415 * @param repeatCount The number of times the action was made. 7416 * @param event The KeyEvent object that defines the button action. 7417 */ 7418 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7419 return false; 7420 } 7421 7422 /** 7423 * Called on the focused view when a key shortcut event is not handled. 7424 * Override this method to implement local key shortcuts for the View. 7425 * Key shortcuts can also be implemented by setting the 7426 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7427 * 7428 * @param keyCode The value in event.getKeyCode(). 7429 * @param event Description of the key event. 7430 * @return If you handled the event, return true. If you want to allow the 7431 * event to be handled by the next receiver, return false. 7432 */ 7433 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7434 return false; 7435 } 7436 7437 /** 7438 * Check whether the called view is a text editor, in which case it 7439 * would make sense to automatically display a soft input window for 7440 * it. Subclasses should override this if they implement 7441 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7442 * a call on that method would return a non-null InputConnection, and 7443 * they are really a first-class editor that the user would normally 7444 * start typing on when the go into a window containing your view. 7445 * 7446 * <p>The default implementation always returns false. This does 7447 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7448 * will not be called or the user can not otherwise perform edits on your 7449 * view; it is just a hint to the system that this is not the primary 7450 * purpose of this view. 7451 * 7452 * @return Returns true if this view is a text editor, else false. 7453 */ 7454 public boolean onCheckIsTextEditor() { 7455 return false; 7456 } 7457 7458 /** 7459 * Create a new InputConnection for an InputMethod to interact 7460 * with the view. The default implementation returns null, since it doesn't 7461 * support input methods. You can override this to implement such support. 7462 * This is only needed for views that take focus and text input. 7463 * 7464 * <p>When implementing this, you probably also want to implement 7465 * {@link #onCheckIsTextEditor()} to indicate you will return a 7466 * non-null InputConnection. 7467 * 7468 * @param outAttrs Fill in with attribute information about the connection. 7469 */ 7470 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7471 return null; 7472 } 7473 7474 /** 7475 * Called by the {@link android.view.inputmethod.InputMethodManager} 7476 * when a view who is not the current 7477 * input connection target is trying to make a call on the manager. The 7478 * default implementation returns false; you can override this to return 7479 * true for certain views if you are performing InputConnection proxying 7480 * to them. 7481 * @param view The View that is making the InputMethodManager call. 7482 * @return Return true to allow the call, false to reject. 7483 */ 7484 public boolean checkInputConnectionProxy(View view) { 7485 return false; 7486 } 7487 7488 /** 7489 * Show the context menu for this view. It is not safe to hold on to the 7490 * menu after returning from this method. 7491 * 7492 * You should normally not overload this method. Overload 7493 * {@link #onCreateContextMenu(ContextMenu)} or define an 7494 * {@link OnCreateContextMenuListener} to add items to the context menu. 7495 * 7496 * @param menu The context menu to populate 7497 */ 7498 public void createContextMenu(ContextMenu menu) { 7499 ContextMenuInfo menuInfo = getContextMenuInfo(); 7500 7501 // Sets the current menu info so all items added to menu will have 7502 // my extra info set. 7503 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7504 7505 onCreateContextMenu(menu); 7506 ListenerInfo li = mListenerInfo; 7507 if (li != null && li.mOnCreateContextMenuListener != null) { 7508 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7509 } 7510 7511 // Clear the extra information so subsequent items that aren't mine don't 7512 // have my extra info. 7513 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7514 7515 if (mParent != null) { 7516 mParent.createContextMenu(menu); 7517 } 7518 } 7519 7520 /** 7521 * Views should implement this if they have extra information to associate 7522 * with the context menu. The return result is supplied as a parameter to 7523 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7524 * callback. 7525 * 7526 * @return Extra information about the item for which the context menu 7527 * should be shown. This information will vary across different 7528 * subclasses of View. 7529 */ 7530 protected ContextMenuInfo getContextMenuInfo() { 7531 return null; 7532 } 7533 7534 /** 7535 * Views should implement this if the view itself is going to add items to 7536 * the context menu. 7537 * 7538 * @param menu the context menu to populate 7539 */ 7540 protected void onCreateContextMenu(ContextMenu menu) { 7541 } 7542 7543 /** 7544 * Implement this method to handle trackball motion events. The 7545 * <em>relative</em> movement of the trackball since the last event 7546 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7547 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7548 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7549 * they will often be fractional values, representing the more fine-grained 7550 * movement information available from a trackball). 7551 * 7552 * @param event The motion event. 7553 * @return True if the event was handled, false otherwise. 7554 */ 7555 public boolean onTrackballEvent(MotionEvent event) { 7556 return false; 7557 } 7558 7559 /** 7560 * Implement this method to handle generic motion events. 7561 * <p> 7562 * Generic motion events describe joystick movements, mouse hovers, track pad 7563 * touches, scroll wheel movements and other input events. The 7564 * {@link MotionEvent#getSource() source} of the motion event specifies 7565 * the class of input that was received. Implementations of this method 7566 * must examine the bits in the source before processing the event. 7567 * The following code example shows how this is done. 7568 * </p><p> 7569 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7570 * are delivered to the view under the pointer. All other generic motion events are 7571 * delivered to the focused view. 7572 * </p> 7573 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7574 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7575 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7576 * // process the joystick movement... 7577 * return true; 7578 * } 7579 * } 7580 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7581 * switch (event.getAction()) { 7582 * case MotionEvent.ACTION_HOVER_MOVE: 7583 * // process the mouse hover movement... 7584 * return true; 7585 * case MotionEvent.ACTION_SCROLL: 7586 * // process the scroll wheel movement... 7587 * return true; 7588 * } 7589 * } 7590 * return super.onGenericMotionEvent(event); 7591 * }</pre> 7592 * 7593 * @param event The generic motion event being processed. 7594 * @return True if the event was handled, false otherwise. 7595 */ 7596 public boolean onGenericMotionEvent(MotionEvent event) { 7597 return false; 7598 } 7599 7600 /** 7601 * Implement this method to handle hover events. 7602 * <p> 7603 * This method is called whenever a pointer is hovering into, over, or out of the 7604 * bounds of a view and the view is not currently being touched. 7605 * Hover events are represented as pointer events with action 7606 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7607 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7608 * </p> 7609 * <ul> 7610 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7611 * when the pointer enters the bounds of the view.</li> 7612 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7613 * when the pointer has already entered the bounds of the view and has moved.</li> 7614 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7615 * when the pointer has exited the bounds of the view or when the pointer is 7616 * about to go down due to a button click, tap, or similar user action that 7617 * causes the view to be touched.</li> 7618 * </ul> 7619 * <p> 7620 * The view should implement this method to return true to indicate that it is 7621 * handling the hover event, such as by changing its drawable state. 7622 * </p><p> 7623 * The default implementation calls {@link #setHovered} to update the hovered state 7624 * of the view when a hover enter or hover exit event is received, if the view 7625 * is enabled and is clickable. The default implementation also sends hover 7626 * accessibility events. 7627 * </p> 7628 * 7629 * @param event The motion event that describes the hover. 7630 * @return True if the view handled the hover event. 7631 * 7632 * @see #isHovered 7633 * @see #setHovered 7634 * @see #onHoverChanged 7635 */ 7636 public boolean onHoverEvent(MotionEvent event) { 7637 // The root view may receive hover (or touch) events that are outside the bounds of 7638 // the window. This code ensures that we only send accessibility events for 7639 // hovers that are actually within the bounds of the root view. 7640 final int action = event.getActionMasked(); 7641 if (!mSendingHoverAccessibilityEvents) { 7642 if ((action == MotionEvent.ACTION_HOVER_ENTER 7643 || action == MotionEvent.ACTION_HOVER_MOVE) 7644 && !hasHoveredChild() 7645 && pointInView(event.getX(), event.getY())) { 7646 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7647 mSendingHoverAccessibilityEvents = true; 7648 requestAccessibilityFocusFromHover(); 7649 } 7650 } else { 7651 if (action == MotionEvent.ACTION_HOVER_EXIT 7652 || (action == MotionEvent.ACTION_MOVE 7653 && !pointInView(event.getX(), event.getY()))) { 7654 mSendingHoverAccessibilityEvents = false; 7655 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7656 // If the window does not have input focus we take away accessibility 7657 // focus as soon as the user stop hovering over the view. 7658 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7659 getViewRootImpl().setAccessibilityFocusedHost(null); 7660 } 7661 } 7662 } 7663 7664 if (isHoverable()) { 7665 switch (action) { 7666 case MotionEvent.ACTION_HOVER_ENTER: 7667 setHovered(true); 7668 break; 7669 case MotionEvent.ACTION_HOVER_EXIT: 7670 setHovered(false); 7671 break; 7672 } 7673 7674 // Dispatch the event to onGenericMotionEvent before returning true. 7675 // This is to provide compatibility with existing applications that 7676 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7677 // break because of the new default handling for hoverable views 7678 // in onHoverEvent. 7679 // Note that onGenericMotionEvent will be called by default when 7680 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7681 dispatchGenericMotionEventInternal(event); 7682 return true; 7683 } 7684 7685 return false; 7686 } 7687 7688 /** 7689 * Returns true if the view should handle {@link #onHoverEvent} 7690 * by calling {@link #setHovered} to change its hovered state. 7691 * 7692 * @return True if the view is hoverable. 7693 */ 7694 private boolean isHoverable() { 7695 final int viewFlags = mViewFlags; 7696 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7697 return false; 7698 } 7699 7700 return (viewFlags & CLICKABLE) == CLICKABLE 7701 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7702 } 7703 7704 /** 7705 * Returns true if the view is currently hovered. 7706 * 7707 * @return True if the view is currently hovered. 7708 * 7709 * @see #setHovered 7710 * @see #onHoverChanged 7711 */ 7712 @ViewDebug.ExportedProperty 7713 public boolean isHovered() { 7714 return (mPrivateFlags & HOVERED) != 0; 7715 } 7716 7717 /** 7718 * Sets whether the view is currently hovered. 7719 * <p> 7720 * Calling this method also changes the drawable state of the view. This 7721 * enables the view to react to hover by using different drawable resources 7722 * to change its appearance. 7723 * </p><p> 7724 * The {@link #onHoverChanged} method is called when the hovered state changes. 7725 * </p> 7726 * 7727 * @param hovered True if the view is hovered. 7728 * 7729 * @see #isHovered 7730 * @see #onHoverChanged 7731 */ 7732 public void setHovered(boolean hovered) { 7733 if (hovered) { 7734 if ((mPrivateFlags & HOVERED) == 0) { 7735 mPrivateFlags |= HOVERED; 7736 refreshDrawableState(); 7737 onHoverChanged(true); 7738 } 7739 } else { 7740 if ((mPrivateFlags & HOVERED) != 0) { 7741 mPrivateFlags &= ~HOVERED; 7742 refreshDrawableState(); 7743 onHoverChanged(false); 7744 } 7745 } 7746 } 7747 7748 /** 7749 * Implement this method to handle hover state changes. 7750 * <p> 7751 * This method is called whenever the hover state changes as a result of a 7752 * call to {@link #setHovered}. 7753 * </p> 7754 * 7755 * @param hovered The current hover state, as returned by {@link #isHovered}. 7756 * 7757 * @see #isHovered 7758 * @see #setHovered 7759 */ 7760 public void onHoverChanged(boolean hovered) { 7761 } 7762 7763 /** 7764 * Implement this method to handle touch screen motion events. 7765 * 7766 * @param event The motion event. 7767 * @return True if the event was handled, false otherwise. 7768 */ 7769 public boolean onTouchEvent(MotionEvent event) { 7770 final int viewFlags = mViewFlags; 7771 7772 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7773 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7774 setPressed(false); 7775 } 7776 // A disabled view that is clickable still consumes the touch 7777 // events, it just doesn't respond to them. 7778 return (((viewFlags & CLICKABLE) == CLICKABLE || 7779 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7780 } 7781 7782 if (mTouchDelegate != null) { 7783 if (mTouchDelegate.onTouchEvent(event)) { 7784 return true; 7785 } 7786 } 7787 7788 if (((viewFlags & CLICKABLE) == CLICKABLE || 7789 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7790 switch (event.getAction()) { 7791 case MotionEvent.ACTION_UP: 7792 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7793 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7794 // take focus if we don't have it already and we should in 7795 // touch mode. 7796 boolean focusTaken = false; 7797 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7798 focusTaken = requestFocus(); 7799 } 7800 7801 if (prepressed) { 7802 // The button is being released before we actually 7803 // showed it as pressed. Make it show the pressed 7804 // state now (before scheduling the click) to ensure 7805 // the user sees it. 7806 setPressed(true); 7807 } 7808 7809 if (!mHasPerformedLongPress) { 7810 // This is a tap, so remove the longpress check 7811 removeLongPressCallback(); 7812 7813 // Only perform take click actions if we were in the pressed state 7814 if (!focusTaken) { 7815 // Use a Runnable and post this rather than calling 7816 // performClick directly. This lets other visual state 7817 // of the view update before click actions start. 7818 if (mPerformClick == null) { 7819 mPerformClick = new PerformClick(); 7820 } 7821 if (!post(mPerformClick)) { 7822 performClick(); 7823 } 7824 } 7825 } 7826 7827 if (mUnsetPressedState == null) { 7828 mUnsetPressedState = new UnsetPressedState(); 7829 } 7830 7831 if (prepressed) { 7832 postDelayed(mUnsetPressedState, 7833 ViewConfiguration.getPressedStateDuration()); 7834 } else if (!post(mUnsetPressedState)) { 7835 // If the post failed, unpress right now 7836 mUnsetPressedState.run(); 7837 } 7838 removeTapCallback(); 7839 } 7840 break; 7841 7842 case MotionEvent.ACTION_DOWN: 7843 mHasPerformedLongPress = false; 7844 7845 if (performButtonActionOnTouchDown(event)) { 7846 break; 7847 } 7848 7849 // Walk up the hierarchy to determine if we're inside a scrolling container. 7850 boolean isInScrollingContainer = isInScrollingContainer(); 7851 7852 // For views inside a scrolling container, delay the pressed feedback for 7853 // a short period in case this is a scroll. 7854 if (isInScrollingContainer) { 7855 mPrivateFlags |= PREPRESSED; 7856 if (mPendingCheckForTap == null) { 7857 mPendingCheckForTap = new CheckForTap(); 7858 } 7859 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7860 } else { 7861 // Not inside a scrolling container, so show the feedback right away 7862 setPressed(true); 7863 checkForLongClick(0); 7864 } 7865 break; 7866 7867 case MotionEvent.ACTION_CANCEL: 7868 setPressed(false); 7869 removeTapCallback(); 7870 break; 7871 7872 case MotionEvent.ACTION_MOVE: 7873 final int x = (int) event.getX(); 7874 final int y = (int) event.getY(); 7875 7876 // Be lenient about moving outside of buttons 7877 if (!pointInView(x, y, mTouchSlop)) { 7878 // Outside button 7879 removeTapCallback(); 7880 if ((mPrivateFlags & PRESSED) != 0) { 7881 // Remove any future long press/tap checks 7882 removeLongPressCallback(); 7883 7884 setPressed(false); 7885 } 7886 } 7887 break; 7888 } 7889 return true; 7890 } 7891 7892 return false; 7893 } 7894 7895 /** 7896 * @hide 7897 */ 7898 public boolean isInScrollingContainer() { 7899 ViewParent p = getParent(); 7900 while (p != null && p instanceof ViewGroup) { 7901 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7902 return true; 7903 } 7904 p = p.getParent(); 7905 } 7906 return false; 7907 } 7908 7909 /** 7910 * Remove the longpress detection timer. 7911 */ 7912 private void removeLongPressCallback() { 7913 if (mPendingCheckForLongPress != null) { 7914 removeCallbacks(mPendingCheckForLongPress); 7915 } 7916 } 7917 7918 /** 7919 * Remove the pending click action 7920 */ 7921 private void removePerformClickCallback() { 7922 if (mPerformClick != null) { 7923 removeCallbacks(mPerformClick); 7924 } 7925 } 7926 7927 /** 7928 * Remove the prepress detection timer. 7929 */ 7930 private void removeUnsetPressCallback() { 7931 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7932 setPressed(false); 7933 removeCallbacks(mUnsetPressedState); 7934 } 7935 } 7936 7937 /** 7938 * Remove the tap detection timer. 7939 */ 7940 private void removeTapCallback() { 7941 if (mPendingCheckForTap != null) { 7942 mPrivateFlags &= ~PREPRESSED; 7943 removeCallbacks(mPendingCheckForTap); 7944 } 7945 } 7946 7947 /** 7948 * Cancels a pending long press. Your subclass can use this if you 7949 * want the context menu to come up if the user presses and holds 7950 * at the same place, but you don't want it to come up if they press 7951 * and then move around enough to cause scrolling. 7952 */ 7953 public void cancelLongPress() { 7954 removeLongPressCallback(); 7955 7956 /* 7957 * The prepressed state handled by the tap callback is a display 7958 * construct, but the tap callback will post a long press callback 7959 * less its own timeout. Remove it here. 7960 */ 7961 removeTapCallback(); 7962 } 7963 7964 /** 7965 * Remove the pending callback for sending a 7966 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7967 */ 7968 private void removeSendViewScrolledAccessibilityEventCallback() { 7969 if (mSendViewScrolledAccessibilityEvent != null) { 7970 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7971 } 7972 } 7973 7974 /** 7975 * Sets the TouchDelegate for this View. 7976 */ 7977 public void setTouchDelegate(TouchDelegate delegate) { 7978 mTouchDelegate = delegate; 7979 } 7980 7981 /** 7982 * Gets the TouchDelegate for this View. 7983 */ 7984 public TouchDelegate getTouchDelegate() { 7985 return mTouchDelegate; 7986 } 7987 7988 /** 7989 * Set flags controlling behavior of this view. 7990 * 7991 * @param flags Constant indicating the value which should be set 7992 * @param mask Constant indicating the bit range that should be changed 7993 */ 7994 void setFlags(int flags, int mask) { 7995 int old = mViewFlags; 7996 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7997 7998 int changed = mViewFlags ^ old; 7999 if (changed == 0) { 8000 return; 8001 } 8002 int privateFlags = mPrivateFlags; 8003 8004 /* Check if the FOCUSABLE bit has changed */ 8005 if (((changed & FOCUSABLE_MASK) != 0) && 8006 ((privateFlags & HAS_BOUNDS) !=0)) { 8007 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8008 && ((privateFlags & FOCUSED) != 0)) { 8009 /* Give up focus if we are no longer focusable */ 8010 clearFocus(); 8011 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8012 && ((privateFlags & FOCUSED) == 0)) { 8013 /* 8014 * Tell the view system that we are now available to take focus 8015 * if no one else already has it. 8016 */ 8017 if (mParent != null) mParent.focusableViewAvailable(this); 8018 } 8019 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8020 notifyAccessibilityStateChanged(); 8021 } 8022 } 8023 8024 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8025 if ((changed & VISIBILITY_MASK) != 0) { 8026 /* 8027 * If this view is becoming visible, invalidate it in case it changed while 8028 * it was not visible. Marking it drawn ensures that the invalidation will 8029 * go through. 8030 */ 8031 mPrivateFlags |= DRAWN; 8032 invalidate(true); 8033 8034 needGlobalAttributesUpdate(true); 8035 8036 // a view becoming visible is worth notifying the parent 8037 // about in case nothing has focus. even if this specific view 8038 // isn't focusable, it may contain something that is, so let 8039 // the root view try to give this focus if nothing else does. 8040 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8041 mParent.focusableViewAvailable(this); 8042 } 8043 } 8044 } 8045 8046 /* Check if the GONE bit has changed */ 8047 if ((changed & GONE) != 0) { 8048 needGlobalAttributesUpdate(false); 8049 requestLayout(); 8050 8051 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8052 if (hasFocus()) clearFocus(); 8053 clearAccessibilityFocus(); 8054 destroyDrawingCache(); 8055 if (mParent instanceof View) { 8056 // GONE views noop invalidation, so invalidate the parent 8057 ((View) mParent).invalidate(true); 8058 } 8059 // Mark the view drawn to ensure that it gets invalidated properly the next 8060 // time it is visible and gets invalidated 8061 mPrivateFlags |= DRAWN; 8062 } 8063 if (mAttachInfo != null) { 8064 mAttachInfo.mViewVisibilityChanged = true; 8065 } 8066 } 8067 8068 /* Check if the VISIBLE bit has changed */ 8069 if ((changed & INVISIBLE) != 0) { 8070 needGlobalAttributesUpdate(false); 8071 /* 8072 * If this view is becoming invisible, set the DRAWN flag so that 8073 * the next invalidate() will not be skipped. 8074 */ 8075 mPrivateFlags |= DRAWN; 8076 8077 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8078 // root view becoming invisible shouldn't clear focus and accessibility focus 8079 if (getRootView() != this) { 8080 clearFocus(); 8081 clearAccessibilityFocus(); 8082 } 8083 } 8084 if (mAttachInfo != null) { 8085 mAttachInfo.mViewVisibilityChanged = true; 8086 } 8087 } 8088 8089 if ((changed & VISIBILITY_MASK) != 0) { 8090 if (mParent instanceof ViewGroup) { 8091 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8092 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8093 ((View) mParent).invalidate(true); 8094 } else if (mParent != null) { 8095 mParent.invalidateChild(this, null); 8096 } 8097 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8098 } 8099 8100 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8101 destroyDrawingCache(); 8102 } 8103 8104 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8105 destroyDrawingCache(); 8106 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8107 invalidateParentCaches(); 8108 } 8109 8110 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8111 destroyDrawingCache(); 8112 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8113 } 8114 8115 if ((changed & DRAW_MASK) != 0) { 8116 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8117 if (mBackground != null) { 8118 mPrivateFlags &= ~SKIP_DRAW; 8119 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8120 } else { 8121 mPrivateFlags |= SKIP_DRAW; 8122 } 8123 } else { 8124 mPrivateFlags &= ~SKIP_DRAW; 8125 } 8126 requestLayout(); 8127 invalidate(true); 8128 } 8129 8130 if ((changed & KEEP_SCREEN_ON) != 0) { 8131 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8132 mParent.recomputeViewAttributes(this); 8133 } 8134 } 8135 8136 if (AccessibilityManager.getInstance(mContext).isEnabled() 8137 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8138 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8139 notifyAccessibilityStateChanged(); 8140 } 8141 } 8142 8143 /** 8144 * Change the view's z order in the tree, so it's on top of other sibling 8145 * views 8146 */ 8147 public void bringToFront() { 8148 if (mParent != null) { 8149 mParent.bringChildToFront(this); 8150 } 8151 } 8152 8153 /** 8154 * This is called in response to an internal scroll in this view (i.e., the 8155 * view scrolled its own contents). This is typically as a result of 8156 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8157 * called. 8158 * 8159 * @param l Current horizontal scroll origin. 8160 * @param t Current vertical scroll origin. 8161 * @param oldl Previous horizontal scroll origin. 8162 * @param oldt Previous vertical scroll origin. 8163 */ 8164 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8165 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8166 postSendViewScrolledAccessibilityEventCallback(); 8167 } 8168 8169 mBackgroundSizeChanged = true; 8170 8171 final AttachInfo ai = mAttachInfo; 8172 if (ai != null) { 8173 ai.mViewScrollChanged = true; 8174 } 8175 } 8176 8177 /** 8178 * Interface definition for a callback to be invoked when the layout bounds of a view 8179 * changes due to layout processing. 8180 */ 8181 public interface OnLayoutChangeListener { 8182 /** 8183 * Called when the focus state of a view has changed. 8184 * 8185 * @param v The view whose state has changed. 8186 * @param left The new value of the view's left property. 8187 * @param top The new value of the view's top property. 8188 * @param right The new value of the view's right property. 8189 * @param bottom The new value of the view's bottom property. 8190 * @param oldLeft The previous value of the view's left property. 8191 * @param oldTop The previous value of the view's top property. 8192 * @param oldRight The previous value of the view's right property. 8193 * @param oldBottom The previous value of the view's bottom property. 8194 */ 8195 void onLayoutChange(View v, int left, int top, int right, int bottom, 8196 int oldLeft, int oldTop, int oldRight, int oldBottom); 8197 } 8198 8199 /** 8200 * This is called during layout when the size of this view has changed. If 8201 * you were just added to the view hierarchy, you're called with the old 8202 * values of 0. 8203 * 8204 * @param w Current width of this view. 8205 * @param h Current height of this view. 8206 * @param oldw Old width of this view. 8207 * @param oldh Old height of this view. 8208 */ 8209 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8210 } 8211 8212 /** 8213 * Called by draw to draw the child views. This may be overridden 8214 * by derived classes to gain control just before its children are drawn 8215 * (but after its own view has been drawn). 8216 * @param canvas the canvas on which to draw the view 8217 */ 8218 protected void dispatchDraw(Canvas canvas) { 8219 8220 } 8221 8222 /** 8223 * Gets the parent of this view. Note that the parent is a 8224 * ViewParent and not necessarily a View. 8225 * 8226 * @return Parent of this view. 8227 */ 8228 public final ViewParent getParent() { 8229 return mParent; 8230 } 8231 8232 /** 8233 * Set the horizontal scrolled position of your view. This will cause a call to 8234 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8235 * invalidated. 8236 * @param value the x position to scroll to 8237 */ 8238 public void setScrollX(int value) { 8239 scrollTo(value, mScrollY); 8240 } 8241 8242 /** 8243 * Set the vertical scrolled position of your view. This will cause a call to 8244 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8245 * invalidated. 8246 * @param value the y position to scroll to 8247 */ 8248 public void setScrollY(int value) { 8249 scrollTo(mScrollX, value); 8250 } 8251 8252 /** 8253 * Return the scrolled left position of this view. This is the left edge of 8254 * the displayed part of your view. You do not need to draw any pixels 8255 * farther left, since those are outside of the frame of your view on 8256 * screen. 8257 * 8258 * @return The left edge of the displayed part of your view, in pixels. 8259 */ 8260 public final int getScrollX() { 8261 return mScrollX; 8262 } 8263 8264 /** 8265 * Return the scrolled top position of this view. This is the top edge of 8266 * the displayed part of your view. You do not need to draw any pixels above 8267 * it, since those are outside of the frame of your view on screen. 8268 * 8269 * @return The top edge of the displayed part of your view, in pixels. 8270 */ 8271 public final int getScrollY() { 8272 return mScrollY; 8273 } 8274 8275 /** 8276 * Return the width of the your view. 8277 * 8278 * @return The width of your view, in pixels. 8279 */ 8280 @ViewDebug.ExportedProperty(category = "layout") 8281 public final int getWidth() { 8282 return mRight - mLeft; 8283 } 8284 8285 /** 8286 * Return the height of your view. 8287 * 8288 * @return The height of your view, in pixels. 8289 */ 8290 @ViewDebug.ExportedProperty(category = "layout") 8291 public final int getHeight() { 8292 return mBottom - mTop; 8293 } 8294 8295 /** 8296 * Return the visible drawing bounds of your view. Fills in the output 8297 * rectangle with the values from getScrollX(), getScrollY(), 8298 * getWidth(), and getHeight(). 8299 * 8300 * @param outRect The (scrolled) drawing bounds of the view. 8301 */ 8302 public void getDrawingRect(Rect outRect) { 8303 outRect.left = mScrollX; 8304 outRect.top = mScrollY; 8305 outRect.right = mScrollX + (mRight - mLeft); 8306 outRect.bottom = mScrollY + (mBottom - mTop); 8307 } 8308 8309 /** 8310 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8311 * raw width component (that is the result is masked by 8312 * {@link #MEASURED_SIZE_MASK}). 8313 * 8314 * @return The raw measured width of this view. 8315 */ 8316 public final int getMeasuredWidth() { 8317 return mMeasuredWidth & MEASURED_SIZE_MASK; 8318 } 8319 8320 /** 8321 * Return the full width measurement information for this view as computed 8322 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8323 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8324 * This should be used during measurement and layout calculations only. Use 8325 * {@link #getWidth()} to see how wide a view is after layout. 8326 * 8327 * @return The measured width of this view as a bit mask. 8328 */ 8329 public final int getMeasuredWidthAndState() { 8330 return mMeasuredWidth; 8331 } 8332 8333 /** 8334 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8335 * raw width component (that is the result is masked by 8336 * {@link #MEASURED_SIZE_MASK}). 8337 * 8338 * @return The raw measured height of this view. 8339 */ 8340 public final int getMeasuredHeight() { 8341 return mMeasuredHeight & MEASURED_SIZE_MASK; 8342 } 8343 8344 /** 8345 * Return the full height measurement information for this view as computed 8346 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8347 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8348 * This should be used during measurement and layout calculations only. Use 8349 * {@link #getHeight()} to see how wide a view is after layout. 8350 * 8351 * @return The measured width of this view as a bit mask. 8352 */ 8353 public final int getMeasuredHeightAndState() { 8354 return mMeasuredHeight; 8355 } 8356 8357 /** 8358 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8359 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8360 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8361 * and the height component is at the shifted bits 8362 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8363 */ 8364 public final int getMeasuredState() { 8365 return (mMeasuredWidth&MEASURED_STATE_MASK) 8366 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8367 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8368 } 8369 8370 /** 8371 * The transform matrix of this view, which is calculated based on the current 8372 * roation, scale, and pivot properties. 8373 * 8374 * @see #getRotation() 8375 * @see #getScaleX() 8376 * @see #getScaleY() 8377 * @see #getPivotX() 8378 * @see #getPivotY() 8379 * @return The current transform matrix for the view 8380 */ 8381 public Matrix getMatrix() { 8382 if (mTransformationInfo != null) { 8383 updateMatrix(); 8384 return mTransformationInfo.mMatrix; 8385 } 8386 return Matrix.IDENTITY_MATRIX; 8387 } 8388 8389 /** 8390 * Utility function to determine if the value is far enough away from zero to be 8391 * considered non-zero. 8392 * @param value A floating point value to check for zero-ness 8393 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8394 */ 8395 private static boolean nonzero(float value) { 8396 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8397 } 8398 8399 /** 8400 * Returns true if the transform matrix is the identity matrix. 8401 * Recomputes the matrix if necessary. 8402 * 8403 * @return True if the transform matrix is the identity matrix, false otherwise. 8404 */ 8405 final boolean hasIdentityMatrix() { 8406 if (mTransformationInfo != null) { 8407 updateMatrix(); 8408 return mTransformationInfo.mMatrixIsIdentity; 8409 } 8410 return true; 8411 } 8412 8413 void ensureTransformationInfo() { 8414 if (mTransformationInfo == null) { 8415 mTransformationInfo = new TransformationInfo(); 8416 } 8417 } 8418 8419 /** 8420 * Recomputes the transform matrix if necessary. 8421 */ 8422 private void updateMatrix() { 8423 final TransformationInfo info = mTransformationInfo; 8424 if (info == null) { 8425 return; 8426 } 8427 if (info.mMatrixDirty) { 8428 // transform-related properties have changed since the last time someone 8429 // asked for the matrix; recalculate it with the current values 8430 8431 // Figure out if we need to update the pivot point 8432 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8433 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8434 info.mPrevWidth = mRight - mLeft; 8435 info.mPrevHeight = mBottom - mTop; 8436 info.mPivotX = info.mPrevWidth / 2f; 8437 info.mPivotY = info.mPrevHeight / 2f; 8438 } 8439 } 8440 info.mMatrix.reset(); 8441 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8442 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8443 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8444 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8445 } else { 8446 if (info.mCamera == null) { 8447 info.mCamera = new Camera(); 8448 info.matrix3D = new Matrix(); 8449 } 8450 info.mCamera.save(); 8451 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8452 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8453 info.mCamera.getMatrix(info.matrix3D); 8454 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8455 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8456 info.mPivotY + info.mTranslationY); 8457 info.mMatrix.postConcat(info.matrix3D); 8458 info.mCamera.restore(); 8459 } 8460 info.mMatrixDirty = false; 8461 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8462 info.mInverseMatrixDirty = true; 8463 } 8464 } 8465 8466 /** 8467 * Utility method to retrieve the inverse of the current mMatrix property. 8468 * We cache the matrix to avoid recalculating it when transform properties 8469 * have not changed. 8470 * 8471 * @return The inverse of the current matrix of this view. 8472 */ 8473 final Matrix getInverseMatrix() { 8474 final TransformationInfo info = mTransformationInfo; 8475 if (info != null) { 8476 updateMatrix(); 8477 if (info.mInverseMatrixDirty) { 8478 if (info.mInverseMatrix == null) { 8479 info.mInverseMatrix = new Matrix(); 8480 } 8481 info.mMatrix.invert(info.mInverseMatrix); 8482 info.mInverseMatrixDirty = false; 8483 } 8484 return info.mInverseMatrix; 8485 } 8486 return Matrix.IDENTITY_MATRIX; 8487 } 8488 8489 /** 8490 * Gets the distance along the Z axis from the camera to this view. 8491 * 8492 * @see #setCameraDistance(float) 8493 * 8494 * @return The distance along the Z axis. 8495 */ 8496 public float getCameraDistance() { 8497 ensureTransformationInfo(); 8498 final float dpi = mResources.getDisplayMetrics().densityDpi; 8499 final TransformationInfo info = mTransformationInfo; 8500 if (info.mCamera == null) { 8501 info.mCamera = new Camera(); 8502 info.matrix3D = new Matrix(); 8503 } 8504 return -(info.mCamera.getLocationZ() * dpi); 8505 } 8506 8507 /** 8508 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8509 * views are drawn) from the camera to this view. The camera's distance 8510 * affects 3D transformations, for instance rotations around the X and Y 8511 * axis. If the rotationX or rotationY properties are changed and this view is 8512 * large (more than half the size of the screen), it is recommended to always 8513 * use a camera distance that's greater than the height (X axis rotation) or 8514 * the width (Y axis rotation) of this view.</p> 8515 * 8516 * <p>The distance of the camera from the view plane can have an affect on the 8517 * perspective distortion of the view when it is rotated around the x or y axis. 8518 * For example, a large distance will result in a large viewing angle, and there 8519 * will not be much perspective distortion of the view as it rotates. A short 8520 * distance may cause much more perspective distortion upon rotation, and can 8521 * also result in some drawing artifacts if the rotated view ends up partially 8522 * behind the camera (which is why the recommendation is to use a distance at 8523 * least as far as the size of the view, if the view is to be rotated.)</p> 8524 * 8525 * <p>The distance is expressed in "depth pixels." The default distance depends 8526 * on the screen density. For instance, on a medium density display, the 8527 * default distance is 1280. On a high density display, the default distance 8528 * is 1920.</p> 8529 * 8530 * <p>If you want to specify a distance that leads to visually consistent 8531 * results across various densities, use the following formula:</p> 8532 * <pre> 8533 * float scale = context.getResources().getDisplayMetrics().density; 8534 * view.setCameraDistance(distance * scale); 8535 * </pre> 8536 * 8537 * <p>The density scale factor of a high density display is 1.5, 8538 * and 1920 = 1280 * 1.5.</p> 8539 * 8540 * @param distance The distance in "depth pixels", if negative the opposite 8541 * value is used 8542 * 8543 * @see #setRotationX(float) 8544 * @see #setRotationY(float) 8545 */ 8546 public void setCameraDistance(float distance) { 8547 invalidateViewProperty(true, false); 8548 8549 ensureTransformationInfo(); 8550 final float dpi = mResources.getDisplayMetrics().densityDpi; 8551 final TransformationInfo info = mTransformationInfo; 8552 if (info.mCamera == null) { 8553 info.mCamera = new Camera(); 8554 info.matrix3D = new Matrix(); 8555 } 8556 8557 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8558 info.mMatrixDirty = true; 8559 8560 invalidateViewProperty(false, false); 8561 if (mDisplayList != null) { 8562 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8563 } 8564 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8565 // View was rejected last time it was drawn by its parent; this may have changed 8566 invalidateParentIfNeeded(); 8567 } 8568 } 8569 8570 /** 8571 * The degrees that the view is rotated around the pivot point. 8572 * 8573 * @see #setRotation(float) 8574 * @see #getPivotX() 8575 * @see #getPivotY() 8576 * 8577 * @return The degrees of rotation. 8578 */ 8579 @ViewDebug.ExportedProperty(category = "drawing") 8580 public float getRotation() { 8581 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8582 } 8583 8584 /** 8585 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8586 * result in clockwise rotation. 8587 * 8588 * @param rotation The degrees of rotation. 8589 * 8590 * @see #getRotation() 8591 * @see #getPivotX() 8592 * @see #getPivotY() 8593 * @see #setRotationX(float) 8594 * @see #setRotationY(float) 8595 * 8596 * @attr ref android.R.styleable#View_rotation 8597 */ 8598 public void setRotation(float rotation) { 8599 ensureTransformationInfo(); 8600 final TransformationInfo info = mTransformationInfo; 8601 if (info.mRotation != rotation) { 8602 // Double-invalidation is necessary to capture view's old and new areas 8603 invalidateViewProperty(true, false); 8604 info.mRotation = rotation; 8605 info.mMatrixDirty = true; 8606 invalidateViewProperty(false, true); 8607 if (mDisplayList != null) { 8608 mDisplayList.setRotation(rotation); 8609 } 8610 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8611 // View was rejected last time it was drawn by its parent; this may have changed 8612 invalidateParentIfNeeded(); 8613 } 8614 } 8615 } 8616 8617 /** 8618 * The degrees that the view is rotated around the vertical axis through the pivot point. 8619 * 8620 * @see #getPivotX() 8621 * @see #getPivotY() 8622 * @see #setRotationY(float) 8623 * 8624 * @return The degrees of Y rotation. 8625 */ 8626 @ViewDebug.ExportedProperty(category = "drawing") 8627 public float getRotationY() { 8628 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8629 } 8630 8631 /** 8632 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8633 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8634 * down the y axis. 8635 * 8636 * When rotating large views, it is recommended to adjust the camera distance 8637 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8638 * 8639 * @param rotationY The degrees of Y rotation. 8640 * 8641 * @see #getRotationY() 8642 * @see #getPivotX() 8643 * @see #getPivotY() 8644 * @see #setRotation(float) 8645 * @see #setRotationX(float) 8646 * @see #setCameraDistance(float) 8647 * 8648 * @attr ref android.R.styleable#View_rotationY 8649 */ 8650 public void setRotationY(float rotationY) { 8651 ensureTransformationInfo(); 8652 final TransformationInfo info = mTransformationInfo; 8653 if (info.mRotationY != rotationY) { 8654 invalidateViewProperty(true, false); 8655 info.mRotationY = rotationY; 8656 info.mMatrixDirty = true; 8657 invalidateViewProperty(false, true); 8658 if (mDisplayList != null) { 8659 mDisplayList.setRotationY(rotationY); 8660 } 8661 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8662 // View was rejected last time it was drawn by its parent; this may have changed 8663 invalidateParentIfNeeded(); 8664 } 8665 } 8666 } 8667 8668 /** 8669 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8670 * 8671 * @see #getPivotX() 8672 * @see #getPivotY() 8673 * @see #setRotationX(float) 8674 * 8675 * @return The degrees of X rotation. 8676 */ 8677 @ViewDebug.ExportedProperty(category = "drawing") 8678 public float getRotationX() { 8679 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8680 } 8681 8682 /** 8683 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8684 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8685 * x axis. 8686 * 8687 * When rotating large views, it is recommended to adjust the camera distance 8688 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8689 * 8690 * @param rotationX The degrees of X rotation. 8691 * 8692 * @see #getRotationX() 8693 * @see #getPivotX() 8694 * @see #getPivotY() 8695 * @see #setRotation(float) 8696 * @see #setRotationY(float) 8697 * @see #setCameraDistance(float) 8698 * 8699 * @attr ref android.R.styleable#View_rotationX 8700 */ 8701 public void setRotationX(float rotationX) { 8702 ensureTransformationInfo(); 8703 final TransformationInfo info = mTransformationInfo; 8704 if (info.mRotationX != rotationX) { 8705 invalidateViewProperty(true, false); 8706 info.mRotationX = rotationX; 8707 info.mMatrixDirty = true; 8708 invalidateViewProperty(false, true); 8709 if (mDisplayList != null) { 8710 mDisplayList.setRotationX(rotationX); 8711 } 8712 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8713 // View was rejected last time it was drawn by its parent; this may have changed 8714 invalidateParentIfNeeded(); 8715 } 8716 } 8717 } 8718 8719 /** 8720 * The amount that the view is scaled in x around the pivot point, as a proportion of 8721 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8722 * 8723 * <p>By default, this is 1.0f. 8724 * 8725 * @see #getPivotX() 8726 * @see #getPivotY() 8727 * @return The scaling factor. 8728 */ 8729 @ViewDebug.ExportedProperty(category = "drawing") 8730 public float getScaleX() { 8731 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8732 } 8733 8734 /** 8735 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8736 * the view's unscaled width. A value of 1 means that no scaling is applied. 8737 * 8738 * @param scaleX The scaling factor. 8739 * @see #getPivotX() 8740 * @see #getPivotY() 8741 * 8742 * @attr ref android.R.styleable#View_scaleX 8743 */ 8744 public void setScaleX(float scaleX) { 8745 ensureTransformationInfo(); 8746 final TransformationInfo info = mTransformationInfo; 8747 if (info.mScaleX != scaleX) { 8748 invalidateViewProperty(true, false); 8749 info.mScaleX = scaleX; 8750 info.mMatrixDirty = true; 8751 invalidateViewProperty(false, true); 8752 if (mDisplayList != null) { 8753 mDisplayList.setScaleX(scaleX); 8754 } 8755 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8756 // View was rejected last time it was drawn by its parent; this may have changed 8757 invalidateParentIfNeeded(); 8758 } 8759 } 8760 } 8761 8762 /** 8763 * The amount that the view is scaled in y around the pivot point, as a proportion of 8764 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8765 * 8766 * <p>By default, this is 1.0f. 8767 * 8768 * @see #getPivotX() 8769 * @see #getPivotY() 8770 * @return The scaling factor. 8771 */ 8772 @ViewDebug.ExportedProperty(category = "drawing") 8773 public float getScaleY() { 8774 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8775 } 8776 8777 /** 8778 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8779 * the view's unscaled width. A value of 1 means that no scaling is applied. 8780 * 8781 * @param scaleY The scaling factor. 8782 * @see #getPivotX() 8783 * @see #getPivotY() 8784 * 8785 * @attr ref android.R.styleable#View_scaleY 8786 */ 8787 public void setScaleY(float scaleY) { 8788 ensureTransformationInfo(); 8789 final TransformationInfo info = mTransformationInfo; 8790 if (info.mScaleY != scaleY) { 8791 invalidateViewProperty(true, false); 8792 info.mScaleY = scaleY; 8793 info.mMatrixDirty = true; 8794 invalidateViewProperty(false, true); 8795 if (mDisplayList != null) { 8796 mDisplayList.setScaleY(scaleY); 8797 } 8798 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8799 // View was rejected last time it was drawn by its parent; this may have changed 8800 invalidateParentIfNeeded(); 8801 } 8802 } 8803 } 8804 8805 /** 8806 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8807 * and {@link #setScaleX(float) scaled}. 8808 * 8809 * @see #getRotation() 8810 * @see #getScaleX() 8811 * @see #getScaleY() 8812 * @see #getPivotY() 8813 * @return The x location of the pivot point. 8814 * 8815 * @attr ref android.R.styleable#View_transformPivotX 8816 */ 8817 @ViewDebug.ExportedProperty(category = "drawing") 8818 public float getPivotX() { 8819 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8820 } 8821 8822 /** 8823 * Sets the x location of the point around which the view is 8824 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8825 * By default, the pivot point is centered on the object. 8826 * Setting this property disables this behavior and causes the view to use only the 8827 * explicitly set pivotX and pivotY values. 8828 * 8829 * @param pivotX The x location of the pivot point. 8830 * @see #getRotation() 8831 * @see #getScaleX() 8832 * @see #getScaleY() 8833 * @see #getPivotY() 8834 * 8835 * @attr ref android.R.styleable#View_transformPivotX 8836 */ 8837 public void setPivotX(float pivotX) { 8838 ensureTransformationInfo(); 8839 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8840 final TransformationInfo info = mTransformationInfo; 8841 if (info.mPivotX != pivotX) { 8842 invalidateViewProperty(true, false); 8843 info.mPivotX = pivotX; 8844 info.mMatrixDirty = true; 8845 invalidateViewProperty(false, true); 8846 if (mDisplayList != null) { 8847 mDisplayList.setPivotX(pivotX); 8848 } 8849 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8850 // View was rejected last time it was drawn by its parent; this may have changed 8851 invalidateParentIfNeeded(); 8852 } 8853 } 8854 } 8855 8856 /** 8857 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8858 * and {@link #setScaleY(float) scaled}. 8859 * 8860 * @see #getRotation() 8861 * @see #getScaleX() 8862 * @see #getScaleY() 8863 * @see #getPivotY() 8864 * @return The y location of the pivot point. 8865 * 8866 * @attr ref android.R.styleable#View_transformPivotY 8867 */ 8868 @ViewDebug.ExportedProperty(category = "drawing") 8869 public float getPivotY() { 8870 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8871 } 8872 8873 /** 8874 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8875 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8876 * Setting this property disables this behavior and causes the view to use only the 8877 * explicitly set pivotX and pivotY values. 8878 * 8879 * @param pivotY The y location of the pivot point. 8880 * @see #getRotation() 8881 * @see #getScaleX() 8882 * @see #getScaleY() 8883 * @see #getPivotY() 8884 * 8885 * @attr ref android.R.styleable#View_transformPivotY 8886 */ 8887 public void setPivotY(float pivotY) { 8888 ensureTransformationInfo(); 8889 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8890 final TransformationInfo info = mTransformationInfo; 8891 if (info.mPivotY != pivotY) { 8892 invalidateViewProperty(true, false); 8893 info.mPivotY = pivotY; 8894 info.mMatrixDirty = true; 8895 invalidateViewProperty(false, true); 8896 if (mDisplayList != null) { 8897 mDisplayList.setPivotY(pivotY); 8898 } 8899 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8900 // View was rejected last time it was drawn by its parent; this may have changed 8901 invalidateParentIfNeeded(); 8902 } 8903 } 8904 } 8905 8906 /** 8907 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8908 * completely transparent and 1 means the view is completely opaque. 8909 * 8910 * <p>By default this is 1.0f. 8911 * @return The opacity of the view. 8912 */ 8913 @ViewDebug.ExportedProperty(category = "drawing") 8914 public float getAlpha() { 8915 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8916 } 8917 8918 /** 8919 * Returns whether this View has content which overlaps. This function, intended to be 8920 * overridden by specific View types, is an optimization when alpha is set on a view. If 8921 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8922 * and then composited it into place, which can be expensive. If the view has no overlapping 8923 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8924 * An example of overlapping rendering is a TextView with a background image, such as a 8925 * Button. An example of non-overlapping rendering is a TextView with no background, or 8926 * an ImageView with only the foreground image. The default implementation returns true; 8927 * subclasses should override if they have cases which can be optimized. 8928 * 8929 * @return true if the content in this view might overlap, false otherwise. 8930 */ 8931 public boolean hasOverlappingRendering() { 8932 return true; 8933 } 8934 8935 /** 8936 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8937 * completely transparent and 1 means the view is completely opaque.</p> 8938 * 8939 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8940 * responsible for applying the opacity itself. Otherwise, calling this method is 8941 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8942 * setting a hardware layer.</p> 8943 * 8944 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8945 * performance implications. It is generally best to use the alpha property sparingly and 8946 * transiently, as in the case of fading animations.</p> 8947 * 8948 * @param alpha The opacity of the view. 8949 * 8950 * @see #setLayerType(int, android.graphics.Paint) 8951 * 8952 * @attr ref android.R.styleable#View_alpha 8953 */ 8954 public void setAlpha(float alpha) { 8955 ensureTransformationInfo(); 8956 if (mTransformationInfo.mAlpha != alpha) { 8957 mTransformationInfo.mAlpha = alpha; 8958 if (onSetAlpha((int) (alpha * 255))) { 8959 mPrivateFlags |= ALPHA_SET; 8960 // subclass is handling alpha - don't optimize rendering cache invalidation 8961 invalidateParentCaches(); 8962 invalidate(true); 8963 } else { 8964 mPrivateFlags &= ~ALPHA_SET; 8965 invalidateViewProperty(true, false); 8966 if (mDisplayList != null) { 8967 mDisplayList.setAlpha(alpha); 8968 } 8969 } 8970 } 8971 } 8972 8973 /** 8974 * Faster version of setAlpha() which performs the same steps except there are 8975 * no calls to invalidate(). The caller of this function should perform proper invalidation 8976 * on the parent and this object. The return value indicates whether the subclass handles 8977 * alpha (the return value for onSetAlpha()). 8978 * 8979 * @param alpha The new value for the alpha property 8980 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8981 * the new value for the alpha property is different from the old value 8982 */ 8983 boolean setAlphaNoInvalidation(float alpha) { 8984 ensureTransformationInfo(); 8985 if (mTransformationInfo.mAlpha != alpha) { 8986 mTransformationInfo.mAlpha = alpha; 8987 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8988 if (subclassHandlesAlpha) { 8989 mPrivateFlags |= ALPHA_SET; 8990 return true; 8991 } else { 8992 mPrivateFlags &= ~ALPHA_SET; 8993 if (mDisplayList != null) { 8994 mDisplayList.setAlpha(alpha); 8995 } 8996 } 8997 } 8998 return false; 8999 } 9000 9001 /** 9002 * Top position of this view relative to its parent. 9003 * 9004 * @return The top of this view, in pixels. 9005 */ 9006 @ViewDebug.CapturedViewProperty 9007 public final int getTop() { 9008 return mTop; 9009 } 9010 9011 /** 9012 * Sets the top position of this view relative to its parent. This method is meant to be called 9013 * by the layout system and should not generally be called otherwise, because the property 9014 * may be changed at any time by the layout. 9015 * 9016 * @param top The top of this view, in pixels. 9017 */ 9018 public final void setTop(int top) { 9019 if (top != mTop) { 9020 updateMatrix(); 9021 final boolean matrixIsIdentity = mTransformationInfo == null 9022 || mTransformationInfo.mMatrixIsIdentity; 9023 if (matrixIsIdentity) { 9024 if (mAttachInfo != null) { 9025 int minTop; 9026 int yLoc; 9027 if (top < mTop) { 9028 minTop = top; 9029 yLoc = top - mTop; 9030 } else { 9031 minTop = mTop; 9032 yLoc = 0; 9033 } 9034 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9035 } 9036 } else { 9037 // Double-invalidation is necessary to capture view's old and new areas 9038 invalidate(true); 9039 } 9040 9041 int width = mRight - mLeft; 9042 int oldHeight = mBottom - mTop; 9043 9044 mTop = top; 9045 if (mDisplayList != null) { 9046 mDisplayList.setTop(mTop); 9047 } 9048 9049 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9050 9051 if (!matrixIsIdentity) { 9052 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9053 // A change in dimension means an auto-centered pivot point changes, too 9054 mTransformationInfo.mMatrixDirty = true; 9055 } 9056 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9057 invalidate(true); 9058 } 9059 mBackgroundSizeChanged = true; 9060 invalidateParentIfNeeded(); 9061 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9062 // View was rejected last time it was drawn by its parent; this may have changed 9063 invalidateParentIfNeeded(); 9064 } 9065 } 9066 } 9067 9068 /** 9069 * Bottom position of this view relative to its parent. 9070 * 9071 * @return The bottom of this view, in pixels. 9072 */ 9073 @ViewDebug.CapturedViewProperty 9074 public final int getBottom() { 9075 return mBottom; 9076 } 9077 9078 /** 9079 * True if this view has changed since the last time being drawn. 9080 * 9081 * @return The dirty state of this view. 9082 */ 9083 public boolean isDirty() { 9084 return (mPrivateFlags & DIRTY_MASK) != 0; 9085 } 9086 9087 /** 9088 * Sets the bottom position of this view relative to its parent. This method is meant to be 9089 * called by the layout system and should not generally be called otherwise, because the 9090 * property may be changed at any time by the layout. 9091 * 9092 * @param bottom The bottom of this view, in pixels. 9093 */ 9094 public final void setBottom(int bottom) { 9095 if (bottom != mBottom) { 9096 updateMatrix(); 9097 final boolean matrixIsIdentity = mTransformationInfo == null 9098 || mTransformationInfo.mMatrixIsIdentity; 9099 if (matrixIsIdentity) { 9100 if (mAttachInfo != null) { 9101 int maxBottom; 9102 if (bottom < mBottom) { 9103 maxBottom = mBottom; 9104 } else { 9105 maxBottom = bottom; 9106 } 9107 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9108 } 9109 } else { 9110 // Double-invalidation is necessary to capture view's old and new areas 9111 invalidate(true); 9112 } 9113 9114 int width = mRight - mLeft; 9115 int oldHeight = mBottom - mTop; 9116 9117 mBottom = bottom; 9118 if (mDisplayList != null) { 9119 mDisplayList.setBottom(mBottom); 9120 } 9121 9122 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9123 9124 if (!matrixIsIdentity) { 9125 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9126 // A change in dimension means an auto-centered pivot point changes, too 9127 mTransformationInfo.mMatrixDirty = true; 9128 } 9129 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9130 invalidate(true); 9131 } 9132 mBackgroundSizeChanged = true; 9133 invalidateParentIfNeeded(); 9134 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9135 // View was rejected last time it was drawn by its parent; this may have changed 9136 invalidateParentIfNeeded(); 9137 } 9138 } 9139 } 9140 9141 /** 9142 * Left position of this view relative to its parent. 9143 * 9144 * @return The left edge of this view, in pixels. 9145 */ 9146 @ViewDebug.CapturedViewProperty 9147 public final int getLeft() { 9148 return mLeft; 9149 } 9150 9151 /** 9152 * Sets the left position of this view relative to its parent. This method is meant to be called 9153 * by the layout system and should not generally be called otherwise, because the property 9154 * may be changed at any time by the layout. 9155 * 9156 * @param left The bottom of this view, in pixels. 9157 */ 9158 public final void setLeft(int left) { 9159 if (left != mLeft) { 9160 updateMatrix(); 9161 final boolean matrixIsIdentity = mTransformationInfo == null 9162 || mTransformationInfo.mMatrixIsIdentity; 9163 if (matrixIsIdentity) { 9164 if (mAttachInfo != null) { 9165 int minLeft; 9166 int xLoc; 9167 if (left < mLeft) { 9168 minLeft = left; 9169 xLoc = left - mLeft; 9170 } else { 9171 minLeft = mLeft; 9172 xLoc = 0; 9173 } 9174 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9175 } 9176 } else { 9177 // Double-invalidation is necessary to capture view's old and new areas 9178 invalidate(true); 9179 } 9180 9181 int oldWidth = mRight - mLeft; 9182 int height = mBottom - mTop; 9183 9184 mLeft = left; 9185 if (mDisplayList != null) { 9186 mDisplayList.setLeft(left); 9187 } 9188 9189 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9190 9191 if (!matrixIsIdentity) { 9192 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9193 // A change in dimension means an auto-centered pivot point changes, too 9194 mTransformationInfo.mMatrixDirty = true; 9195 } 9196 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9197 invalidate(true); 9198 } 9199 mBackgroundSizeChanged = true; 9200 invalidateParentIfNeeded(); 9201 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9202 // View was rejected last time it was drawn by its parent; this may have changed 9203 invalidateParentIfNeeded(); 9204 } 9205 } 9206 } 9207 9208 /** 9209 * Right position of this view relative to its parent. 9210 * 9211 * @return The right edge of this view, in pixels. 9212 */ 9213 @ViewDebug.CapturedViewProperty 9214 public final int getRight() { 9215 return mRight; 9216 } 9217 9218 /** 9219 * Sets the right position of this view relative to its parent. This method is meant to be called 9220 * by the layout system and should not generally be called otherwise, because the property 9221 * may be changed at any time by the layout. 9222 * 9223 * @param right The bottom of this view, in pixels. 9224 */ 9225 public final void setRight(int right) { 9226 if (right != mRight) { 9227 updateMatrix(); 9228 final boolean matrixIsIdentity = mTransformationInfo == null 9229 || mTransformationInfo.mMatrixIsIdentity; 9230 if (matrixIsIdentity) { 9231 if (mAttachInfo != null) { 9232 int maxRight; 9233 if (right < mRight) { 9234 maxRight = mRight; 9235 } else { 9236 maxRight = right; 9237 } 9238 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9239 } 9240 } else { 9241 // Double-invalidation is necessary to capture view's old and new areas 9242 invalidate(true); 9243 } 9244 9245 int oldWidth = mRight - mLeft; 9246 int height = mBottom - mTop; 9247 9248 mRight = right; 9249 if (mDisplayList != null) { 9250 mDisplayList.setRight(mRight); 9251 } 9252 9253 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9254 9255 if (!matrixIsIdentity) { 9256 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9257 // A change in dimension means an auto-centered pivot point changes, too 9258 mTransformationInfo.mMatrixDirty = true; 9259 } 9260 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9261 invalidate(true); 9262 } 9263 mBackgroundSizeChanged = true; 9264 invalidateParentIfNeeded(); 9265 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9266 // View was rejected last time it was drawn by its parent; this may have changed 9267 invalidateParentIfNeeded(); 9268 } 9269 } 9270 } 9271 9272 /** 9273 * The visual x position of this view, in pixels. This is equivalent to the 9274 * {@link #setTranslationX(float) translationX} property plus the current 9275 * {@link #getLeft() left} property. 9276 * 9277 * @return The visual x position of this view, in pixels. 9278 */ 9279 @ViewDebug.ExportedProperty(category = "drawing") 9280 public float getX() { 9281 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9282 } 9283 9284 /** 9285 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9286 * {@link #setTranslationX(float) translationX} property to be the difference between 9287 * the x value passed in and the current {@link #getLeft() left} property. 9288 * 9289 * @param x The visual x position of this view, in pixels. 9290 */ 9291 public void setX(float x) { 9292 setTranslationX(x - mLeft); 9293 } 9294 9295 /** 9296 * The visual y position of this view, in pixels. This is equivalent to the 9297 * {@link #setTranslationY(float) translationY} property plus the current 9298 * {@link #getTop() top} property. 9299 * 9300 * @return The visual y position of this view, in pixels. 9301 */ 9302 @ViewDebug.ExportedProperty(category = "drawing") 9303 public float getY() { 9304 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9305 } 9306 9307 /** 9308 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9309 * {@link #setTranslationY(float) translationY} property to be the difference between 9310 * the y value passed in and the current {@link #getTop() top} property. 9311 * 9312 * @param y The visual y position of this view, in pixels. 9313 */ 9314 public void setY(float y) { 9315 setTranslationY(y - mTop); 9316 } 9317 9318 9319 /** 9320 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9321 * This position is post-layout, in addition to wherever the object's 9322 * layout placed it. 9323 * 9324 * @return The horizontal position of this view relative to its left position, in pixels. 9325 */ 9326 @ViewDebug.ExportedProperty(category = "drawing") 9327 public float getTranslationX() { 9328 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9329 } 9330 9331 /** 9332 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9333 * This effectively positions the object post-layout, in addition to wherever the object's 9334 * layout placed it. 9335 * 9336 * @param translationX The horizontal position of this view relative to its left position, 9337 * in pixels. 9338 * 9339 * @attr ref android.R.styleable#View_translationX 9340 */ 9341 public void setTranslationX(float translationX) { 9342 ensureTransformationInfo(); 9343 final TransformationInfo info = mTransformationInfo; 9344 if (info.mTranslationX != translationX) { 9345 // Double-invalidation is necessary to capture view's old and new areas 9346 invalidateViewProperty(true, false); 9347 info.mTranslationX = translationX; 9348 info.mMatrixDirty = true; 9349 invalidateViewProperty(false, true); 9350 if (mDisplayList != null) { 9351 mDisplayList.setTranslationX(translationX); 9352 } 9353 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9354 // View was rejected last time it was drawn by its parent; this may have changed 9355 invalidateParentIfNeeded(); 9356 } 9357 } 9358 } 9359 9360 /** 9361 * The horizontal location of this view relative to its {@link #getTop() top} position. 9362 * This position is post-layout, in addition to wherever the object's 9363 * layout placed it. 9364 * 9365 * @return The vertical position of this view relative to its top position, 9366 * in pixels. 9367 */ 9368 @ViewDebug.ExportedProperty(category = "drawing") 9369 public float getTranslationY() { 9370 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9371 } 9372 9373 /** 9374 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9375 * This effectively positions the object post-layout, in addition to wherever the object's 9376 * layout placed it. 9377 * 9378 * @param translationY The vertical position of this view relative to its top position, 9379 * in pixels. 9380 * 9381 * @attr ref android.R.styleable#View_translationY 9382 */ 9383 public void setTranslationY(float translationY) { 9384 ensureTransformationInfo(); 9385 final TransformationInfo info = mTransformationInfo; 9386 if (info.mTranslationY != translationY) { 9387 invalidateViewProperty(true, false); 9388 info.mTranslationY = translationY; 9389 info.mMatrixDirty = true; 9390 invalidateViewProperty(false, true); 9391 if (mDisplayList != null) { 9392 mDisplayList.setTranslationY(translationY); 9393 } 9394 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9395 // View was rejected last time it was drawn by its parent; this may have changed 9396 invalidateParentIfNeeded(); 9397 } 9398 } 9399 } 9400 9401 /** 9402 * Hit rectangle in parent's coordinates 9403 * 9404 * @param outRect The hit rectangle of the view. 9405 */ 9406 public void getHitRect(Rect outRect) { 9407 updateMatrix(); 9408 final TransformationInfo info = mTransformationInfo; 9409 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9410 outRect.set(mLeft, mTop, mRight, mBottom); 9411 } else { 9412 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9413 tmpRect.set(-info.mPivotX, -info.mPivotY, 9414 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9415 info.mMatrix.mapRect(tmpRect); 9416 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9417 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9418 } 9419 } 9420 9421 /** 9422 * Determines whether the given point, in local coordinates is inside the view. 9423 */ 9424 /*package*/ final boolean pointInView(float localX, float localY) { 9425 return localX >= 0 && localX < (mRight - mLeft) 9426 && localY >= 0 && localY < (mBottom - mTop); 9427 } 9428 9429 /** 9430 * Utility method to determine whether the given point, in local coordinates, 9431 * is inside the view, where the area of the view is expanded by the slop factor. 9432 * This method is called while processing touch-move events to determine if the event 9433 * is still within the view. 9434 */ 9435 private boolean pointInView(float localX, float localY, float slop) { 9436 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9437 localY < ((mBottom - mTop) + slop); 9438 } 9439 9440 /** 9441 * When a view has focus and the user navigates away from it, the next view is searched for 9442 * starting from the rectangle filled in by this method. 9443 * 9444 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9445 * of the view. However, if your view maintains some idea of internal selection, 9446 * such as a cursor, or a selected row or column, you should override this method and 9447 * fill in a more specific rectangle. 9448 * 9449 * @param r The rectangle to fill in, in this view's coordinates. 9450 */ 9451 public void getFocusedRect(Rect r) { 9452 getDrawingRect(r); 9453 } 9454 9455 /** 9456 * If some part of this view is not clipped by any of its parents, then 9457 * return that area in r in global (root) coordinates. To convert r to local 9458 * coordinates (without taking possible View rotations into account), offset 9459 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9460 * If the view is completely clipped or translated out, return false. 9461 * 9462 * @param r If true is returned, r holds the global coordinates of the 9463 * visible portion of this view. 9464 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9465 * between this view and its root. globalOffet may be null. 9466 * @return true if r is non-empty (i.e. part of the view is visible at the 9467 * root level. 9468 */ 9469 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9470 int width = mRight - mLeft; 9471 int height = mBottom - mTop; 9472 if (width > 0 && height > 0) { 9473 r.set(0, 0, width, height); 9474 if (globalOffset != null) { 9475 globalOffset.set(-mScrollX, -mScrollY); 9476 } 9477 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9478 } 9479 return false; 9480 } 9481 9482 public final boolean getGlobalVisibleRect(Rect r) { 9483 return getGlobalVisibleRect(r, null); 9484 } 9485 9486 public final boolean getLocalVisibleRect(Rect r) { 9487 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9488 if (getGlobalVisibleRect(r, offset)) { 9489 r.offset(-offset.x, -offset.y); // make r local 9490 return true; 9491 } 9492 return false; 9493 } 9494 9495 /** 9496 * Offset this view's vertical location by the specified number of pixels. 9497 * 9498 * @param offset the number of pixels to offset the view by 9499 */ 9500 public void offsetTopAndBottom(int offset) { 9501 if (offset != 0) { 9502 updateMatrix(); 9503 final boolean matrixIsIdentity = mTransformationInfo == null 9504 || mTransformationInfo.mMatrixIsIdentity; 9505 if (matrixIsIdentity) { 9506 if (mDisplayList != null) { 9507 invalidateViewProperty(false, false); 9508 } else { 9509 final ViewParent p = mParent; 9510 if (p != null && mAttachInfo != null) { 9511 final Rect r = mAttachInfo.mTmpInvalRect; 9512 int minTop; 9513 int maxBottom; 9514 int yLoc; 9515 if (offset < 0) { 9516 minTop = mTop + offset; 9517 maxBottom = mBottom; 9518 yLoc = offset; 9519 } else { 9520 minTop = mTop; 9521 maxBottom = mBottom + offset; 9522 yLoc = 0; 9523 } 9524 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9525 p.invalidateChild(this, r); 9526 } 9527 } 9528 } else { 9529 invalidateViewProperty(false, false); 9530 } 9531 9532 mTop += offset; 9533 mBottom += offset; 9534 if (mDisplayList != null) { 9535 mDisplayList.offsetTopBottom(offset); 9536 invalidateViewProperty(false, false); 9537 } else { 9538 if (!matrixIsIdentity) { 9539 invalidateViewProperty(false, true); 9540 } 9541 invalidateParentIfNeeded(); 9542 } 9543 } 9544 } 9545 9546 /** 9547 * Offset this view's horizontal location by the specified amount of pixels. 9548 * 9549 * @param offset the numer of pixels to offset the view by 9550 */ 9551 public void offsetLeftAndRight(int offset) { 9552 if (offset != 0) { 9553 updateMatrix(); 9554 final boolean matrixIsIdentity = mTransformationInfo == null 9555 || mTransformationInfo.mMatrixIsIdentity; 9556 if (matrixIsIdentity) { 9557 if (mDisplayList != null) { 9558 invalidateViewProperty(false, false); 9559 } else { 9560 final ViewParent p = mParent; 9561 if (p != null && mAttachInfo != null) { 9562 final Rect r = mAttachInfo.mTmpInvalRect; 9563 int minLeft; 9564 int maxRight; 9565 if (offset < 0) { 9566 minLeft = mLeft + offset; 9567 maxRight = mRight; 9568 } else { 9569 minLeft = mLeft; 9570 maxRight = mRight + offset; 9571 } 9572 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9573 p.invalidateChild(this, r); 9574 } 9575 } 9576 } else { 9577 invalidateViewProperty(false, false); 9578 } 9579 9580 mLeft += offset; 9581 mRight += offset; 9582 if (mDisplayList != null) { 9583 mDisplayList.offsetLeftRight(offset); 9584 invalidateViewProperty(false, false); 9585 } else { 9586 if (!matrixIsIdentity) { 9587 invalidateViewProperty(false, true); 9588 } 9589 invalidateParentIfNeeded(); 9590 } 9591 } 9592 } 9593 9594 /** 9595 * Get the LayoutParams associated with this view. All views should have 9596 * layout parameters. These supply parameters to the <i>parent</i> of this 9597 * view specifying how it should be arranged. There are many subclasses of 9598 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9599 * of ViewGroup that are responsible for arranging their children. 9600 * 9601 * This method may return null if this View is not attached to a parent 9602 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9603 * was not invoked successfully. When a View is attached to a parent 9604 * ViewGroup, this method must not return null. 9605 * 9606 * @return The LayoutParams associated with this view, or null if no 9607 * parameters have been set yet 9608 */ 9609 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9610 public ViewGroup.LayoutParams getLayoutParams() { 9611 return mLayoutParams; 9612 } 9613 9614 /** 9615 * Set the layout parameters associated with this view. These supply 9616 * parameters to the <i>parent</i> of this view specifying how it should be 9617 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9618 * correspond to the different subclasses of ViewGroup that are responsible 9619 * for arranging their children. 9620 * 9621 * @param params The layout parameters for this view, cannot be null 9622 */ 9623 public void setLayoutParams(ViewGroup.LayoutParams params) { 9624 if (params == null) { 9625 throw new NullPointerException("Layout parameters cannot be null"); 9626 } 9627 mLayoutParams = params; 9628 if (mParent instanceof ViewGroup) { 9629 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9630 } 9631 requestLayout(); 9632 } 9633 9634 /** 9635 * Set the scrolled position of your view. This will cause a call to 9636 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9637 * invalidated. 9638 * @param x the x position to scroll to 9639 * @param y the y position to scroll to 9640 */ 9641 public void scrollTo(int x, int y) { 9642 if (mScrollX != x || mScrollY != y) { 9643 int oldX = mScrollX; 9644 int oldY = mScrollY; 9645 mScrollX = x; 9646 mScrollY = y; 9647 invalidateParentCaches(); 9648 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9649 if (!awakenScrollBars()) { 9650 postInvalidateOnAnimation(); 9651 } 9652 } 9653 } 9654 9655 /** 9656 * Move the scrolled position of your view. This will cause a call to 9657 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9658 * invalidated. 9659 * @param x the amount of pixels to scroll by horizontally 9660 * @param y the amount of pixels to scroll by vertically 9661 */ 9662 public void scrollBy(int x, int y) { 9663 scrollTo(mScrollX + x, mScrollY + y); 9664 } 9665 9666 /** 9667 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9668 * animation to fade the scrollbars out after a default delay. If a subclass 9669 * provides animated scrolling, the start delay should equal the duration 9670 * of the scrolling animation.</p> 9671 * 9672 * <p>The animation starts only if at least one of the scrollbars is 9673 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9674 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9675 * this method returns true, and false otherwise. If the animation is 9676 * started, this method calls {@link #invalidate()}; in that case the 9677 * caller should not call {@link #invalidate()}.</p> 9678 * 9679 * <p>This method should be invoked every time a subclass directly updates 9680 * the scroll parameters.</p> 9681 * 9682 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9683 * and {@link #scrollTo(int, int)}.</p> 9684 * 9685 * @return true if the animation is played, false otherwise 9686 * 9687 * @see #awakenScrollBars(int) 9688 * @see #scrollBy(int, int) 9689 * @see #scrollTo(int, int) 9690 * @see #isHorizontalScrollBarEnabled() 9691 * @see #isVerticalScrollBarEnabled() 9692 * @see #setHorizontalScrollBarEnabled(boolean) 9693 * @see #setVerticalScrollBarEnabled(boolean) 9694 */ 9695 protected boolean awakenScrollBars() { 9696 return mScrollCache != null && 9697 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9698 } 9699 9700 /** 9701 * Trigger the scrollbars to draw. 9702 * This method differs from awakenScrollBars() only in its default duration. 9703 * initialAwakenScrollBars() will show the scroll bars for longer than 9704 * usual to give the user more of a chance to notice them. 9705 * 9706 * @return true if the animation is played, false otherwise. 9707 */ 9708 private boolean initialAwakenScrollBars() { 9709 return mScrollCache != null && 9710 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9711 } 9712 9713 /** 9714 * <p> 9715 * Trigger the scrollbars to draw. When invoked this method starts an 9716 * animation to fade the scrollbars out after a fixed delay. If a subclass 9717 * provides animated scrolling, the start delay should equal the duration of 9718 * the scrolling animation. 9719 * </p> 9720 * 9721 * <p> 9722 * The animation starts only if at least one of the scrollbars is enabled, 9723 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9724 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9725 * this method returns true, and false otherwise. If the animation is 9726 * started, this method calls {@link #invalidate()}; in that case the caller 9727 * should not call {@link #invalidate()}. 9728 * </p> 9729 * 9730 * <p> 9731 * This method should be invoked everytime a subclass directly updates the 9732 * scroll parameters. 9733 * </p> 9734 * 9735 * @param startDelay the delay, in milliseconds, after which the animation 9736 * should start; when the delay is 0, the animation starts 9737 * immediately 9738 * @return true if the animation is played, false otherwise 9739 * 9740 * @see #scrollBy(int, int) 9741 * @see #scrollTo(int, int) 9742 * @see #isHorizontalScrollBarEnabled() 9743 * @see #isVerticalScrollBarEnabled() 9744 * @see #setHorizontalScrollBarEnabled(boolean) 9745 * @see #setVerticalScrollBarEnabled(boolean) 9746 */ 9747 protected boolean awakenScrollBars(int startDelay) { 9748 return awakenScrollBars(startDelay, true); 9749 } 9750 9751 /** 9752 * <p> 9753 * Trigger the scrollbars to draw. When invoked this method starts an 9754 * animation to fade the scrollbars out after a fixed delay. If a subclass 9755 * provides animated scrolling, the start delay should equal the duration of 9756 * the scrolling animation. 9757 * </p> 9758 * 9759 * <p> 9760 * The animation starts only if at least one of the scrollbars is enabled, 9761 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9762 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9763 * this method returns true, and false otherwise. If the animation is 9764 * started, this method calls {@link #invalidate()} if the invalidate parameter 9765 * is set to true; in that case the caller 9766 * should not call {@link #invalidate()}. 9767 * </p> 9768 * 9769 * <p> 9770 * This method should be invoked everytime a subclass directly updates the 9771 * scroll parameters. 9772 * </p> 9773 * 9774 * @param startDelay the delay, in milliseconds, after which the animation 9775 * should start; when the delay is 0, the animation starts 9776 * immediately 9777 * 9778 * @param invalidate Wheter this method should call invalidate 9779 * 9780 * @return true if the animation is played, false otherwise 9781 * 9782 * @see #scrollBy(int, int) 9783 * @see #scrollTo(int, int) 9784 * @see #isHorizontalScrollBarEnabled() 9785 * @see #isVerticalScrollBarEnabled() 9786 * @see #setHorizontalScrollBarEnabled(boolean) 9787 * @see #setVerticalScrollBarEnabled(boolean) 9788 */ 9789 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9790 final ScrollabilityCache scrollCache = mScrollCache; 9791 9792 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9793 return false; 9794 } 9795 9796 if (scrollCache.scrollBar == null) { 9797 scrollCache.scrollBar = new ScrollBarDrawable(); 9798 } 9799 9800 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9801 9802 if (invalidate) { 9803 // Invalidate to show the scrollbars 9804 postInvalidateOnAnimation(); 9805 } 9806 9807 if (scrollCache.state == ScrollabilityCache.OFF) { 9808 // FIXME: this is copied from WindowManagerService. 9809 // We should get this value from the system when it 9810 // is possible to do so. 9811 final int KEY_REPEAT_FIRST_DELAY = 750; 9812 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9813 } 9814 9815 // Tell mScrollCache when we should start fading. This may 9816 // extend the fade start time if one was already scheduled 9817 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9818 scrollCache.fadeStartTime = fadeStartTime; 9819 scrollCache.state = ScrollabilityCache.ON; 9820 9821 // Schedule our fader to run, unscheduling any old ones first 9822 if (mAttachInfo != null) { 9823 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9824 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9825 } 9826 9827 return true; 9828 } 9829 9830 return false; 9831 } 9832 9833 /** 9834 * Do not invalidate views which are not visible and which are not running an animation. They 9835 * will not get drawn and they should not set dirty flags as if they will be drawn 9836 */ 9837 private boolean skipInvalidate() { 9838 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9839 (!(mParent instanceof ViewGroup) || 9840 !((ViewGroup) mParent).isViewTransitioning(this)); 9841 } 9842 /** 9843 * Mark the area defined by dirty as needing to be drawn. If the view is 9844 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9845 * in the future. This must be called from a UI thread. To call from a non-UI 9846 * thread, call {@link #postInvalidate()}. 9847 * 9848 * WARNING: This method is destructive to dirty. 9849 * @param dirty the rectangle representing the bounds of the dirty region 9850 */ 9851 public void invalidate(Rect dirty) { 9852 if (ViewDebug.TRACE_HIERARCHY) { 9853 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9854 } 9855 9856 if (skipInvalidate()) { 9857 return; 9858 } 9859 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9860 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9861 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9862 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9863 mPrivateFlags |= INVALIDATED; 9864 mPrivateFlags |= DIRTY; 9865 final ViewParent p = mParent; 9866 final AttachInfo ai = mAttachInfo; 9867 //noinspection PointlessBooleanExpression,ConstantConditions 9868 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9869 if (p != null && ai != null && ai.mHardwareAccelerated) { 9870 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9871 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9872 p.invalidateChild(this, null); 9873 return; 9874 } 9875 } 9876 if (p != null && ai != null) { 9877 final int scrollX = mScrollX; 9878 final int scrollY = mScrollY; 9879 final Rect r = ai.mTmpInvalRect; 9880 r.set(dirty.left - scrollX, dirty.top - scrollY, 9881 dirty.right - scrollX, dirty.bottom - scrollY); 9882 mParent.invalidateChild(this, r); 9883 } 9884 } 9885 } 9886 9887 /** 9888 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9889 * The coordinates of the dirty rect are relative to the view. 9890 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9891 * will be called at some point in the future. This must be called from 9892 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9893 * @param l the left position of the dirty region 9894 * @param t the top position of the dirty region 9895 * @param r the right position of the dirty region 9896 * @param b the bottom position of the dirty region 9897 */ 9898 public void invalidate(int l, int t, int r, int b) { 9899 if (ViewDebug.TRACE_HIERARCHY) { 9900 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9901 } 9902 9903 if (skipInvalidate()) { 9904 return; 9905 } 9906 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9907 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9908 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9909 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9910 mPrivateFlags |= INVALIDATED; 9911 mPrivateFlags |= DIRTY; 9912 final ViewParent p = mParent; 9913 final AttachInfo ai = mAttachInfo; 9914 //noinspection PointlessBooleanExpression,ConstantConditions 9915 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9916 if (p != null && ai != null && ai.mHardwareAccelerated) { 9917 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9918 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9919 p.invalidateChild(this, null); 9920 return; 9921 } 9922 } 9923 if (p != null && ai != null && l < r && t < b) { 9924 final int scrollX = mScrollX; 9925 final int scrollY = mScrollY; 9926 final Rect tmpr = ai.mTmpInvalRect; 9927 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9928 p.invalidateChild(this, tmpr); 9929 } 9930 } 9931 } 9932 9933 /** 9934 * Invalidate the whole view. If the view is visible, 9935 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9936 * the future. This must be called from a UI thread. To call from a non-UI thread, 9937 * call {@link #postInvalidate()}. 9938 */ 9939 public void invalidate() { 9940 invalidate(true); 9941 } 9942 9943 /** 9944 * This is where the invalidate() work actually happens. A full invalidate() 9945 * causes the drawing cache to be invalidated, but this function can be called with 9946 * invalidateCache set to false to skip that invalidation step for cases that do not 9947 * need it (for example, a component that remains at the same dimensions with the same 9948 * content). 9949 * 9950 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9951 * well. This is usually true for a full invalidate, but may be set to false if the 9952 * View's contents or dimensions have not changed. 9953 */ 9954 void invalidate(boolean invalidateCache) { 9955 if (ViewDebug.TRACE_HIERARCHY) { 9956 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9957 } 9958 9959 if (skipInvalidate()) { 9960 return; 9961 } 9962 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9963 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9964 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9965 mLastIsOpaque = isOpaque(); 9966 mPrivateFlags &= ~DRAWN; 9967 mPrivateFlags |= DIRTY; 9968 if (invalidateCache) { 9969 mPrivateFlags |= INVALIDATED; 9970 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9971 } 9972 final AttachInfo ai = mAttachInfo; 9973 final ViewParent p = mParent; 9974 //noinspection PointlessBooleanExpression,ConstantConditions 9975 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9976 if (p != null && ai != null && ai.mHardwareAccelerated) { 9977 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9978 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9979 p.invalidateChild(this, null); 9980 return; 9981 } 9982 } 9983 9984 if (p != null && ai != null) { 9985 final Rect r = ai.mTmpInvalRect; 9986 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9987 // Don't call invalidate -- we don't want to internally scroll 9988 // our own bounds 9989 p.invalidateChild(this, r); 9990 } 9991 } 9992 } 9993 9994 /** 9995 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9996 * set any flags or handle all of the cases handled by the default invalidation methods. 9997 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9998 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9999 * walk up the hierarchy, transforming the dirty rect as necessary. 10000 * 10001 * The method also handles normal invalidation logic if display list properties are not 10002 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10003 * backup approach, to handle these cases used in the various property-setting methods. 10004 * 10005 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10006 * are not being used in this view 10007 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10008 * list properties are not being used in this view 10009 */ 10010 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10011 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10012 if (invalidateParent) { 10013 invalidateParentCaches(); 10014 } 10015 if (forceRedraw) { 10016 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10017 } 10018 invalidate(false); 10019 } else { 10020 final AttachInfo ai = mAttachInfo; 10021 final ViewParent p = mParent; 10022 if (p != null && ai != null) { 10023 final Rect r = ai.mTmpInvalRect; 10024 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10025 if (mParent instanceof ViewGroup) { 10026 ((ViewGroup) mParent).invalidateChildFast(this, r); 10027 } else { 10028 mParent.invalidateChild(this, r); 10029 } 10030 } 10031 } 10032 } 10033 10034 /** 10035 * Utility method to transform a given Rect by the current matrix of this view. 10036 */ 10037 void transformRect(final Rect rect) { 10038 if (!getMatrix().isIdentity()) { 10039 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10040 boundingRect.set(rect); 10041 getMatrix().mapRect(boundingRect); 10042 rect.set((int) (boundingRect.left - 0.5f), 10043 (int) (boundingRect.top - 0.5f), 10044 (int) (boundingRect.right + 0.5f), 10045 (int) (boundingRect.bottom + 0.5f)); 10046 } 10047 } 10048 10049 /** 10050 * Used to indicate that the parent of this view should clear its caches. This functionality 10051 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10052 * which is necessary when various parent-managed properties of the view change, such as 10053 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10054 * clears the parent caches and does not causes an invalidate event. 10055 * 10056 * @hide 10057 */ 10058 protected void invalidateParentCaches() { 10059 if (mParent instanceof View) { 10060 ((View) mParent).mPrivateFlags |= INVALIDATED; 10061 } 10062 } 10063 10064 /** 10065 * Used to indicate that the parent of this view should be invalidated. This functionality 10066 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10067 * which is necessary when various parent-managed properties of the view change, such as 10068 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10069 * an invalidation event to the parent. 10070 * 10071 * @hide 10072 */ 10073 protected void invalidateParentIfNeeded() { 10074 if (isHardwareAccelerated() && mParent instanceof View) { 10075 ((View) mParent).invalidate(true); 10076 } 10077 } 10078 10079 /** 10080 * Indicates whether this View is opaque. An opaque View guarantees that it will 10081 * draw all the pixels overlapping its bounds using a fully opaque color. 10082 * 10083 * Subclasses of View should override this method whenever possible to indicate 10084 * whether an instance is opaque. Opaque Views are treated in a special way by 10085 * the View hierarchy, possibly allowing it to perform optimizations during 10086 * invalidate/draw passes. 10087 * 10088 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10089 */ 10090 @ViewDebug.ExportedProperty(category = "drawing") 10091 public boolean isOpaque() { 10092 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10093 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10094 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10095 } 10096 10097 /** 10098 * @hide 10099 */ 10100 protected void computeOpaqueFlags() { 10101 // Opaque if: 10102 // - Has a background 10103 // - Background is opaque 10104 // - Doesn't have scrollbars or scrollbars are inside overlay 10105 10106 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10107 mPrivateFlags |= OPAQUE_BACKGROUND; 10108 } else { 10109 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10110 } 10111 10112 final int flags = mViewFlags; 10113 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10114 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10115 mPrivateFlags |= OPAQUE_SCROLLBARS; 10116 } else { 10117 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10118 } 10119 } 10120 10121 /** 10122 * @hide 10123 */ 10124 protected boolean hasOpaqueScrollbars() { 10125 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10126 } 10127 10128 /** 10129 * @return A handler associated with the thread running the View. This 10130 * handler can be used to pump events in the UI events queue. 10131 */ 10132 public Handler getHandler() { 10133 if (mAttachInfo != null) { 10134 return mAttachInfo.mHandler; 10135 } 10136 return null; 10137 } 10138 10139 /** 10140 * Gets the view root associated with the View. 10141 * @return The view root, or null if none. 10142 * @hide 10143 */ 10144 public ViewRootImpl getViewRootImpl() { 10145 if (mAttachInfo != null) { 10146 return mAttachInfo.mViewRootImpl; 10147 } 10148 return null; 10149 } 10150 10151 /** 10152 * <p>Causes the Runnable to be added to the message queue. 10153 * The runnable will be run on the user interface thread.</p> 10154 * 10155 * <p>This method can be invoked from outside of the UI thread 10156 * only when this View is attached to a window.</p> 10157 * 10158 * @param action The Runnable that will be executed. 10159 * 10160 * @return Returns true if the Runnable was successfully placed in to the 10161 * message queue. Returns false on failure, usually because the 10162 * looper processing the message queue is exiting. 10163 * 10164 * @see #postDelayed 10165 * @see #removeCallbacks 10166 */ 10167 public boolean post(Runnable action) { 10168 final AttachInfo attachInfo = mAttachInfo; 10169 if (attachInfo != null) { 10170 return attachInfo.mHandler.post(action); 10171 } 10172 // Assume that post will succeed later 10173 ViewRootImpl.getRunQueue().post(action); 10174 return true; 10175 } 10176 10177 /** 10178 * <p>Causes the Runnable to be added to the message queue, to be run 10179 * after the specified amount of time elapses. 10180 * The runnable will be run on the user interface thread.</p> 10181 * 10182 * <p>This method can be invoked from outside of the UI thread 10183 * only when this View is attached to a window.</p> 10184 * 10185 * @param action The Runnable that will be executed. 10186 * @param delayMillis The delay (in milliseconds) until the Runnable 10187 * will be executed. 10188 * 10189 * @return true if the Runnable was successfully placed in to the 10190 * message queue. Returns false on failure, usually because the 10191 * looper processing the message queue is exiting. Note that a 10192 * result of true does not mean the Runnable will be processed -- 10193 * if the looper is quit before the delivery time of the message 10194 * occurs then the message will be dropped. 10195 * 10196 * @see #post 10197 * @see #removeCallbacks 10198 */ 10199 public boolean postDelayed(Runnable action, long delayMillis) { 10200 final AttachInfo attachInfo = mAttachInfo; 10201 if (attachInfo != null) { 10202 return attachInfo.mHandler.postDelayed(action, delayMillis); 10203 } 10204 // Assume that post will succeed later 10205 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10206 return true; 10207 } 10208 10209 /** 10210 * <p>Causes the Runnable to execute on the next animation time step. 10211 * The runnable will be run on the user interface thread.</p> 10212 * 10213 * <p>This method can be invoked from outside of the UI thread 10214 * only when this View is attached to a window.</p> 10215 * 10216 * @param action The Runnable that will be executed. 10217 * 10218 * @see #postOnAnimationDelayed 10219 * @see #removeCallbacks 10220 */ 10221 public void postOnAnimation(Runnable action) { 10222 final AttachInfo attachInfo = mAttachInfo; 10223 if (attachInfo != null) { 10224 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10225 Choreographer.CALLBACK_ANIMATION, action, null); 10226 } else { 10227 // Assume that post will succeed later 10228 ViewRootImpl.getRunQueue().post(action); 10229 } 10230 } 10231 10232 /** 10233 * <p>Causes the Runnable to execute on the next animation time step, 10234 * after the specified amount of time elapses. 10235 * The runnable will be run on the user interface thread.</p> 10236 * 10237 * <p>This method can be invoked from outside of the UI thread 10238 * only when this View is attached to a window.</p> 10239 * 10240 * @param action The Runnable that will be executed. 10241 * @param delayMillis The delay (in milliseconds) until the Runnable 10242 * will be executed. 10243 * 10244 * @see #postOnAnimation 10245 * @see #removeCallbacks 10246 */ 10247 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10248 final AttachInfo attachInfo = mAttachInfo; 10249 if (attachInfo != null) { 10250 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10251 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10252 } else { 10253 // Assume that post will succeed later 10254 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10255 } 10256 } 10257 10258 /** 10259 * <p>Removes the specified Runnable from the message queue.</p> 10260 * 10261 * <p>This method can be invoked from outside of the UI thread 10262 * only when this View is attached to a window.</p> 10263 * 10264 * @param action The Runnable to remove from the message handling queue 10265 * 10266 * @return true if this view could ask the Handler to remove the Runnable, 10267 * false otherwise. When the returned value is true, the Runnable 10268 * may or may not have been actually removed from the message queue 10269 * (for instance, if the Runnable was not in the queue already.) 10270 * 10271 * @see #post 10272 * @see #postDelayed 10273 * @see #postOnAnimation 10274 * @see #postOnAnimationDelayed 10275 */ 10276 public boolean removeCallbacks(Runnable action) { 10277 if (action != null) { 10278 final AttachInfo attachInfo = mAttachInfo; 10279 if (attachInfo != null) { 10280 attachInfo.mHandler.removeCallbacks(action); 10281 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10282 Choreographer.CALLBACK_ANIMATION, action, null); 10283 } else { 10284 // Assume that post will succeed later 10285 ViewRootImpl.getRunQueue().removeCallbacks(action); 10286 } 10287 } 10288 return true; 10289 } 10290 10291 /** 10292 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10293 * Use this to invalidate the View from a non-UI thread.</p> 10294 * 10295 * <p>This method can be invoked from outside of the UI thread 10296 * only when this View is attached to a window.</p> 10297 * 10298 * @see #invalidate() 10299 * @see #postInvalidateDelayed(long) 10300 */ 10301 public void postInvalidate() { 10302 postInvalidateDelayed(0); 10303 } 10304 10305 /** 10306 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10307 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10308 * 10309 * <p>This method can be invoked from outside of the UI thread 10310 * only when this View is attached to a window.</p> 10311 * 10312 * @param left The left coordinate of the rectangle to invalidate. 10313 * @param top The top coordinate of the rectangle to invalidate. 10314 * @param right The right coordinate of the rectangle to invalidate. 10315 * @param bottom The bottom coordinate of the rectangle to invalidate. 10316 * 10317 * @see #invalidate(int, int, int, int) 10318 * @see #invalidate(Rect) 10319 * @see #postInvalidateDelayed(long, int, int, int, int) 10320 */ 10321 public void postInvalidate(int left, int top, int right, int bottom) { 10322 postInvalidateDelayed(0, left, top, right, bottom); 10323 } 10324 10325 /** 10326 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10327 * loop. Waits for the specified amount of time.</p> 10328 * 10329 * <p>This method can be invoked from outside of the UI thread 10330 * only when this View is attached to a window.</p> 10331 * 10332 * @param delayMilliseconds the duration in milliseconds to delay the 10333 * invalidation by 10334 * 10335 * @see #invalidate() 10336 * @see #postInvalidate() 10337 */ 10338 public void postInvalidateDelayed(long delayMilliseconds) { 10339 // We try only with the AttachInfo because there's no point in invalidating 10340 // if we are not attached to our window 10341 final AttachInfo attachInfo = mAttachInfo; 10342 if (attachInfo != null) { 10343 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10344 } 10345 } 10346 10347 /** 10348 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10349 * through the event loop. Waits for the specified amount of time.</p> 10350 * 10351 * <p>This method can be invoked from outside of the UI thread 10352 * only when this View is attached to a window.</p> 10353 * 10354 * @param delayMilliseconds the duration in milliseconds to delay the 10355 * invalidation by 10356 * @param left The left coordinate of the rectangle to invalidate. 10357 * @param top The top coordinate of the rectangle to invalidate. 10358 * @param right The right coordinate of the rectangle to invalidate. 10359 * @param bottom The bottom coordinate of the rectangle to invalidate. 10360 * 10361 * @see #invalidate(int, int, int, int) 10362 * @see #invalidate(Rect) 10363 * @see #postInvalidate(int, int, int, int) 10364 */ 10365 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10366 int right, int bottom) { 10367 10368 // We try only with the AttachInfo because there's no point in invalidating 10369 // if we are not attached to our window 10370 final AttachInfo attachInfo = mAttachInfo; 10371 if (attachInfo != null) { 10372 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10373 info.target = this; 10374 info.left = left; 10375 info.top = top; 10376 info.right = right; 10377 info.bottom = bottom; 10378 10379 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10380 } 10381 } 10382 10383 /** 10384 * <p>Cause an invalidate to happen on the next animation time step, typically the 10385 * next display frame.</p> 10386 * 10387 * <p>This method can be invoked from outside of the UI thread 10388 * only when this View is attached to a window.</p> 10389 * 10390 * @see #invalidate() 10391 */ 10392 public void postInvalidateOnAnimation() { 10393 // We try only with the AttachInfo because there's no point in invalidating 10394 // if we are not attached to our window 10395 final AttachInfo attachInfo = mAttachInfo; 10396 if (attachInfo != null) { 10397 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10398 } 10399 } 10400 10401 /** 10402 * <p>Cause an invalidate of the specified area to happen on the next animation 10403 * time step, typically the next display frame.</p> 10404 * 10405 * <p>This method can be invoked from outside of the UI thread 10406 * only when this View is attached to a window.</p> 10407 * 10408 * @param left The left coordinate of the rectangle to invalidate. 10409 * @param top The top coordinate of the rectangle to invalidate. 10410 * @param right The right coordinate of the rectangle to invalidate. 10411 * @param bottom The bottom coordinate of the rectangle to invalidate. 10412 * 10413 * @see #invalidate(int, int, int, int) 10414 * @see #invalidate(Rect) 10415 */ 10416 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10417 // We try only with the AttachInfo because there's no point in invalidating 10418 // if we are not attached to our window 10419 final AttachInfo attachInfo = mAttachInfo; 10420 if (attachInfo != null) { 10421 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10422 info.target = this; 10423 info.left = left; 10424 info.top = top; 10425 info.right = right; 10426 info.bottom = bottom; 10427 10428 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10429 } 10430 } 10431 10432 /** 10433 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10434 * This event is sent at most once every 10435 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10436 */ 10437 private void postSendViewScrolledAccessibilityEventCallback() { 10438 if (mSendViewScrolledAccessibilityEvent == null) { 10439 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10440 } 10441 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10442 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10443 postDelayed(mSendViewScrolledAccessibilityEvent, 10444 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10445 } 10446 } 10447 10448 /** 10449 * Called by a parent to request that a child update its values for mScrollX 10450 * and mScrollY if necessary. This will typically be done if the child is 10451 * animating a scroll using a {@link android.widget.Scroller Scroller} 10452 * object. 10453 */ 10454 public void computeScroll() { 10455 } 10456 10457 /** 10458 * <p>Indicate whether the horizontal edges are faded when the view is 10459 * scrolled horizontally.</p> 10460 * 10461 * @return true if the horizontal edges should are faded on scroll, false 10462 * otherwise 10463 * 10464 * @see #setHorizontalFadingEdgeEnabled(boolean) 10465 * 10466 * @attr ref android.R.styleable#View_requiresFadingEdge 10467 */ 10468 public boolean isHorizontalFadingEdgeEnabled() { 10469 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10470 } 10471 10472 /** 10473 * <p>Define whether the horizontal edges should be faded when this view 10474 * is scrolled horizontally.</p> 10475 * 10476 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10477 * be faded when the view is scrolled 10478 * horizontally 10479 * 10480 * @see #isHorizontalFadingEdgeEnabled() 10481 * 10482 * @attr ref android.R.styleable#View_requiresFadingEdge 10483 */ 10484 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10485 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10486 if (horizontalFadingEdgeEnabled) { 10487 initScrollCache(); 10488 } 10489 10490 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10491 } 10492 } 10493 10494 /** 10495 * <p>Indicate whether the vertical edges are faded when the view is 10496 * scrolled horizontally.</p> 10497 * 10498 * @return true if the vertical edges should are faded on scroll, false 10499 * otherwise 10500 * 10501 * @see #setVerticalFadingEdgeEnabled(boolean) 10502 * 10503 * @attr ref android.R.styleable#View_requiresFadingEdge 10504 */ 10505 public boolean isVerticalFadingEdgeEnabled() { 10506 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10507 } 10508 10509 /** 10510 * <p>Define whether the vertical edges should be faded when this view 10511 * is scrolled vertically.</p> 10512 * 10513 * @param verticalFadingEdgeEnabled true if the vertical edges should 10514 * be faded when the view is scrolled 10515 * vertically 10516 * 10517 * @see #isVerticalFadingEdgeEnabled() 10518 * 10519 * @attr ref android.R.styleable#View_requiresFadingEdge 10520 */ 10521 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10522 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10523 if (verticalFadingEdgeEnabled) { 10524 initScrollCache(); 10525 } 10526 10527 mViewFlags ^= FADING_EDGE_VERTICAL; 10528 } 10529 } 10530 10531 /** 10532 * Returns the strength, or intensity, of the top faded edge. The strength is 10533 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10534 * returns 0.0 or 1.0 but no value in between. 10535 * 10536 * Subclasses should override this method to provide a smoother fade transition 10537 * when scrolling occurs. 10538 * 10539 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10540 */ 10541 protected float getTopFadingEdgeStrength() { 10542 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10543 } 10544 10545 /** 10546 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10547 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10548 * returns 0.0 or 1.0 but no value in between. 10549 * 10550 * Subclasses should override this method to provide a smoother fade transition 10551 * when scrolling occurs. 10552 * 10553 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10554 */ 10555 protected float getBottomFadingEdgeStrength() { 10556 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10557 computeVerticalScrollRange() ? 1.0f : 0.0f; 10558 } 10559 10560 /** 10561 * Returns the strength, or intensity, of the left faded edge. The strength is 10562 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10563 * returns 0.0 or 1.0 but no value in between. 10564 * 10565 * Subclasses should override this method to provide a smoother fade transition 10566 * when scrolling occurs. 10567 * 10568 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10569 */ 10570 protected float getLeftFadingEdgeStrength() { 10571 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10572 } 10573 10574 /** 10575 * Returns the strength, or intensity, of the right faded edge. The strength is 10576 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10577 * returns 0.0 or 1.0 but no value in between. 10578 * 10579 * Subclasses should override this method to provide a smoother fade transition 10580 * when scrolling occurs. 10581 * 10582 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10583 */ 10584 protected float getRightFadingEdgeStrength() { 10585 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10586 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10587 } 10588 10589 /** 10590 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10591 * scrollbar is not drawn by default.</p> 10592 * 10593 * @return true if the horizontal scrollbar should be painted, false 10594 * otherwise 10595 * 10596 * @see #setHorizontalScrollBarEnabled(boolean) 10597 */ 10598 public boolean isHorizontalScrollBarEnabled() { 10599 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10600 } 10601 10602 /** 10603 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10604 * scrollbar is not drawn by default.</p> 10605 * 10606 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10607 * be painted 10608 * 10609 * @see #isHorizontalScrollBarEnabled() 10610 */ 10611 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10612 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10613 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10614 computeOpaqueFlags(); 10615 resolvePadding(); 10616 } 10617 } 10618 10619 /** 10620 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10621 * scrollbar is not drawn by default.</p> 10622 * 10623 * @return true if the vertical scrollbar should be painted, false 10624 * otherwise 10625 * 10626 * @see #setVerticalScrollBarEnabled(boolean) 10627 */ 10628 public boolean isVerticalScrollBarEnabled() { 10629 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10630 } 10631 10632 /** 10633 * <p>Define whether the vertical scrollbar should be drawn or not. The 10634 * scrollbar is not drawn by default.</p> 10635 * 10636 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10637 * be painted 10638 * 10639 * @see #isVerticalScrollBarEnabled() 10640 */ 10641 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10642 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10643 mViewFlags ^= SCROLLBARS_VERTICAL; 10644 computeOpaqueFlags(); 10645 resolvePadding(); 10646 } 10647 } 10648 10649 /** 10650 * @hide 10651 */ 10652 protected void recomputePadding() { 10653 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10654 } 10655 10656 /** 10657 * Define whether scrollbars will fade when the view is not scrolling. 10658 * 10659 * @param fadeScrollbars wheter to enable fading 10660 * 10661 * @attr ref android.R.styleable#View_fadeScrollbars 10662 */ 10663 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10664 initScrollCache(); 10665 final ScrollabilityCache scrollabilityCache = mScrollCache; 10666 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10667 if (fadeScrollbars) { 10668 scrollabilityCache.state = ScrollabilityCache.OFF; 10669 } else { 10670 scrollabilityCache.state = ScrollabilityCache.ON; 10671 } 10672 } 10673 10674 /** 10675 * 10676 * Returns true if scrollbars will fade when this view is not scrolling 10677 * 10678 * @return true if scrollbar fading is enabled 10679 * 10680 * @attr ref android.R.styleable#View_fadeScrollbars 10681 */ 10682 public boolean isScrollbarFadingEnabled() { 10683 return mScrollCache != null && mScrollCache.fadeScrollBars; 10684 } 10685 10686 /** 10687 * 10688 * Returns the delay before scrollbars fade. 10689 * 10690 * @return the delay before scrollbars fade 10691 * 10692 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10693 */ 10694 public int getScrollBarDefaultDelayBeforeFade() { 10695 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10696 mScrollCache.scrollBarDefaultDelayBeforeFade; 10697 } 10698 10699 /** 10700 * Define the delay before scrollbars fade. 10701 * 10702 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10703 * 10704 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10705 */ 10706 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10707 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10708 } 10709 10710 /** 10711 * 10712 * Returns the scrollbar fade duration. 10713 * 10714 * @return the scrollbar fade duration 10715 * 10716 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10717 */ 10718 public int getScrollBarFadeDuration() { 10719 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10720 mScrollCache.scrollBarFadeDuration; 10721 } 10722 10723 /** 10724 * Define the scrollbar fade duration. 10725 * 10726 * @param scrollBarFadeDuration - the scrollbar fade duration 10727 * 10728 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10729 */ 10730 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10731 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10732 } 10733 10734 /** 10735 * 10736 * Returns the scrollbar size. 10737 * 10738 * @return the scrollbar size 10739 * 10740 * @attr ref android.R.styleable#View_scrollbarSize 10741 */ 10742 public int getScrollBarSize() { 10743 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10744 mScrollCache.scrollBarSize; 10745 } 10746 10747 /** 10748 * Define the scrollbar size. 10749 * 10750 * @param scrollBarSize - the scrollbar size 10751 * 10752 * @attr ref android.R.styleable#View_scrollbarSize 10753 */ 10754 public void setScrollBarSize(int scrollBarSize) { 10755 getScrollCache().scrollBarSize = scrollBarSize; 10756 } 10757 10758 /** 10759 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10760 * inset. When inset, they add to the padding of the view. And the scrollbars 10761 * can be drawn inside the padding area or on the edge of the view. For example, 10762 * if a view has a background drawable and you want to draw the scrollbars 10763 * inside the padding specified by the drawable, you can use 10764 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10765 * appear at the edge of the view, ignoring the padding, then you can use 10766 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10767 * @param style the style of the scrollbars. Should be one of 10768 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10769 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10770 * @see #SCROLLBARS_INSIDE_OVERLAY 10771 * @see #SCROLLBARS_INSIDE_INSET 10772 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10773 * @see #SCROLLBARS_OUTSIDE_INSET 10774 * 10775 * @attr ref android.R.styleable#View_scrollbarStyle 10776 */ 10777 public void setScrollBarStyle(int style) { 10778 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10779 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10780 computeOpaqueFlags(); 10781 resolvePadding(); 10782 } 10783 } 10784 10785 /** 10786 * <p>Returns the current scrollbar style.</p> 10787 * @return the current scrollbar style 10788 * @see #SCROLLBARS_INSIDE_OVERLAY 10789 * @see #SCROLLBARS_INSIDE_INSET 10790 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10791 * @see #SCROLLBARS_OUTSIDE_INSET 10792 * 10793 * @attr ref android.R.styleable#View_scrollbarStyle 10794 */ 10795 @ViewDebug.ExportedProperty(mapping = { 10796 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10797 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10798 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10799 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10800 }) 10801 public int getScrollBarStyle() { 10802 return mViewFlags & SCROLLBARS_STYLE_MASK; 10803 } 10804 10805 /** 10806 * <p>Compute the horizontal range that the horizontal scrollbar 10807 * represents.</p> 10808 * 10809 * <p>The range is expressed in arbitrary units that must be the same as the 10810 * units used by {@link #computeHorizontalScrollExtent()} and 10811 * {@link #computeHorizontalScrollOffset()}.</p> 10812 * 10813 * <p>The default range is the drawing width of this view.</p> 10814 * 10815 * @return the total horizontal range represented by the horizontal 10816 * scrollbar 10817 * 10818 * @see #computeHorizontalScrollExtent() 10819 * @see #computeHorizontalScrollOffset() 10820 * @see android.widget.ScrollBarDrawable 10821 */ 10822 protected int computeHorizontalScrollRange() { 10823 return getWidth(); 10824 } 10825 10826 /** 10827 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10828 * within the horizontal range. This value is used to compute the position 10829 * of the thumb within the scrollbar's track.</p> 10830 * 10831 * <p>The range is expressed in arbitrary units that must be the same as the 10832 * units used by {@link #computeHorizontalScrollRange()} and 10833 * {@link #computeHorizontalScrollExtent()}.</p> 10834 * 10835 * <p>The default offset is the scroll offset of this view.</p> 10836 * 10837 * @return the horizontal offset of the scrollbar's thumb 10838 * 10839 * @see #computeHorizontalScrollRange() 10840 * @see #computeHorizontalScrollExtent() 10841 * @see android.widget.ScrollBarDrawable 10842 */ 10843 protected int computeHorizontalScrollOffset() { 10844 return mScrollX; 10845 } 10846 10847 /** 10848 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10849 * within the horizontal range. This value is used to compute the length 10850 * of the thumb within the scrollbar's track.</p> 10851 * 10852 * <p>The range is expressed in arbitrary units that must be the same as the 10853 * units used by {@link #computeHorizontalScrollRange()} and 10854 * {@link #computeHorizontalScrollOffset()}.</p> 10855 * 10856 * <p>The default extent is the drawing width of this view.</p> 10857 * 10858 * @return the horizontal extent of the scrollbar's thumb 10859 * 10860 * @see #computeHorizontalScrollRange() 10861 * @see #computeHorizontalScrollOffset() 10862 * @see android.widget.ScrollBarDrawable 10863 */ 10864 protected int computeHorizontalScrollExtent() { 10865 return getWidth(); 10866 } 10867 10868 /** 10869 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10870 * 10871 * <p>The range is expressed in arbitrary units that must be the same as the 10872 * units used by {@link #computeVerticalScrollExtent()} and 10873 * {@link #computeVerticalScrollOffset()}.</p> 10874 * 10875 * @return the total vertical range represented by the vertical scrollbar 10876 * 10877 * <p>The default range is the drawing height of this view.</p> 10878 * 10879 * @see #computeVerticalScrollExtent() 10880 * @see #computeVerticalScrollOffset() 10881 * @see android.widget.ScrollBarDrawable 10882 */ 10883 protected int computeVerticalScrollRange() { 10884 return getHeight(); 10885 } 10886 10887 /** 10888 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10889 * within the horizontal range. This value is used to compute the position 10890 * of the thumb within the scrollbar's track.</p> 10891 * 10892 * <p>The range is expressed in arbitrary units that must be the same as the 10893 * units used by {@link #computeVerticalScrollRange()} and 10894 * {@link #computeVerticalScrollExtent()}.</p> 10895 * 10896 * <p>The default offset is the scroll offset of this view.</p> 10897 * 10898 * @return the vertical offset of the scrollbar's thumb 10899 * 10900 * @see #computeVerticalScrollRange() 10901 * @see #computeVerticalScrollExtent() 10902 * @see android.widget.ScrollBarDrawable 10903 */ 10904 protected int computeVerticalScrollOffset() { 10905 return mScrollY; 10906 } 10907 10908 /** 10909 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10910 * within the vertical range. This value is used to compute the length 10911 * of the thumb within the scrollbar's track.</p> 10912 * 10913 * <p>The range is expressed in arbitrary units that must be the same as the 10914 * units used by {@link #computeVerticalScrollRange()} and 10915 * {@link #computeVerticalScrollOffset()}.</p> 10916 * 10917 * <p>The default extent is the drawing height of this view.</p> 10918 * 10919 * @return the vertical extent of the scrollbar's thumb 10920 * 10921 * @see #computeVerticalScrollRange() 10922 * @see #computeVerticalScrollOffset() 10923 * @see android.widget.ScrollBarDrawable 10924 */ 10925 protected int computeVerticalScrollExtent() { 10926 return getHeight(); 10927 } 10928 10929 /** 10930 * Check if this view can be scrolled horizontally in a certain direction. 10931 * 10932 * @param direction Negative to check scrolling left, positive to check scrolling right. 10933 * @return true if this view can be scrolled in the specified direction, false otherwise. 10934 */ 10935 public boolean canScrollHorizontally(int direction) { 10936 final int offset = computeHorizontalScrollOffset(); 10937 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10938 if (range == 0) return false; 10939 if (direction < 0) { 10940 return offset > 0; 10941 } else { 10942 return offset < range - 1; 10943 } 10944 } 10945 10946 /** 10947 * Check if this view can be scrolled vertically in a certain direction. 10948 * 10949 * @param direction Negative to check scrolling up, positive to check scrolling down. 10950 * @return true if this view can be scrolled in the specified direction, false otherwise. 10951 */ 10952 public boolean canScrollVertically(int direction) { 10953 final int offset = computeVerticalScrollOffset(); 10954 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10955 if (range == 0) return false; 10956 if (direction < 0) { 10957 return offset > 0; 10958 } else { 10959 return offset < range - 1; 10960 } 10961 } 10962 10963 /** 10964 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10965 * scrollbars are painted only if they have been awakened first.</p> 10966 * 10967 * @param canvas the canvas on which to draw the scrollbars 10968 * 10969 * @see #awakenScrollBars(int) 10970 */ 10971 protected final void onDrawScrollBars(Canvas canvas) { 10972 // scrollbars are drawn only when the animation is running 10973 final ScrollabilityCache cache = mScrollCache; 10974 if (cache != null) { 10975 10976 int state = cache.state; 10977 10978 if (state == ScrollabilityCache.OFF) { 10979 return; 10980 } 10981 10982 boolean invalidate = false; 10983 10984 if (state == ScrollabilityCache.FADING) { 10985 // We're fading -- get our fade interpolation 10986 if (cache.interpolatorValues == null) { 10987 cache.interpolatorValues = new float[1]; 10988 } 10989 10990 float[] values = cache.interpolatorValues; 10991 10992 // Stops the animation if we're done 10993 if (cache.scrollBarInterpolator.timeToValues(values) == 10994 Interpolator.Result.FREEZE_END) { 10995 cache.state = ScrollabilityCache.OFF; 10996 } else { 10997 cache.scrollBar.setAlpha(Math.round(values[0])); 10998 } 10999 11000 // This will make the scroll bars inval themselves after 11001 // drawing. We only want this when we're fading so that 11002 // we prevent excessive redraws 11003 invalidate = true; 11004 } else { 11005 // We're just on -- but we may have been fading before so 11006 // reset alpha 11007 cache.scrollBar.setAlpha(255); 11008 } 11009 11010 11011 final int viewFlags = mViewFlags; 11012 11013 final boolean drawHorizontalScrollBar = 11014 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11015 final boolean drawVerticalScrollBar = 11016 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11017 && !isVerticalScrollBarHidden(); 11018 11019 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11020 final int width = mRight - mLeft; 11021 final int height = mBottom - mTop; 11022 11023 final ScrollBarDrawable scrollBar = cache.scrollBar; 11024 11025 final int scrollX = mScrollX; 11026 final int scrollY = mScrollY; 11027 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11028 11029 int left, top, right, bottom; 11030 11031 if (drawHorizontalScrollBar) { 11032 int size = scrollBar.getSize(false); 11033 if (size <= 0) { 11034 size = cache.scrollBarSize; 11035 } 11036 11037 scrollBar.setParameters(computeHorizontalScrollRange(), 11038 computeHorizontalScrollOffset(), 11039 computeHorizontalScrollExtent(), false); 11040 final int verticalScrollBarGap = drawVerticalScrollBar ? 11041 getVerticalScrollbarWidth() : 0; 11042 top = scrollY + height - size - (mUserPaddingBottom & inside); 11043 left = scrollX + (mPaddingLeft & inside); 11044 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11045 bottom = top + size; 11046 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11047 if (invalidate) { 11048 invalidate(left, top, right, bottom); 11049 } 11050 } 11051 11052 if (drawVerticalScrollBar) { 11053 int size = scrollBar.getSize(true); 11054 if (size <= 0) { 11055 size = cache.scrollBarSize; 11056 } 11057 11058 scrollBar.setParameters(computeVerticalScrollRange(), 11059 computeVerticalScrollOffset(), 11060 computeVerticalScrollExtent(), true); 11061 switch (mVerticalScrollbarPosition) { 11062 default: 11063 case SCROLLBAR_POSITION_DEFAULT: 11064 case SCROLLBAR_POSITION_RIGHT: 11065 left = scrollX + width - size - (mUserPaddingRight & inside); 11066 break; 11067 case SCROLLBAR_POSITION_LEFT: 11068 left = scrollX + (mUserPaddingLeft & inside); 11069 break; 11070 } 11071 top = scrollY + (mPaddingTop & inside); 11072 right = left + size; 11073 bottom = scrollY + height - (mUserPaddingBottom & inside); 11074 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11075 if (invalidate) { 11076 invalidate(left, top, right, bottom); 11077 } 11078 } 11079 } 11080 } 11081 } 11082 11083 /** 11084 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11085 * FastScroller is visible. 11086 * @return whether to temporarily hide the vertical scrollbar 11087 * @hide 11088 */ 11089 protected boolean isVerticalScrollBarHidden() { 11090 return false; 11091 } 11092 11093 /** 11094 * <p>Draw the horizontal scrollbar if 11095 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11096 * 11097 * @param canvas the canvas on which to draw the scrollbar 11098 * @param scrollBar the scrollbar's drawable 11099 * 11100 * @see #isHorizontalScrollBarEnabled() 11101 * @see #computeHorizontalScrollRange() 11102 * @see #computeHorizontalScrollExtent() 11103 * @see #computeHorizontalScrollOffset() 11104 * @see android.widget.ScrollBarDrawable 11105 * @hide 11106 */ 11107 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11108 int l, int t, int r, int b) { 11109 scrollBar.setBounds(l, t, r, b); 11110 scrollBar.draw(canvas); 11111 } 11112 11113 /** 11114 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11115 * returns true.</p> 11116 * 11117 * @param canvas the canvas on which to draw the scrollbar 11118 * @param scrollBar the scrollbar's drawable 11119 * 11120 * @see #isVerticalScrollBarEnabled() 11121 * @see #computeVerticalScrollRange() 11122 * @see #computeVerticalScrollExtent() 11123 * @see #computeVerticalScrollOffset() 11124 * @see android.widget.ScrollBarDrawable 11125 * @hide 11126 */ 11127 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11128 int l, int t, int r, int b) { 11129 scrollBar.setBounds(l, t, r, b); 11130 scrollBar.draw(canvas); 11131 } 11132 11133 /** 11134 * Implement this to do your drawing. 11135 * 11136 * @param canvas the canvas on which the background will be drawn 11137 */ 11138 protected void onDraw(Canvas canvas) { 11139 } 11140 11141 /* 11142 * Caller is responsible for calling requestLayout if necessary. 11143 * (This allows addViewInLayout to not request a new layout.) 11144 */ 11145 void assignParent(ViewParent parent) { 11146 if (mParent == null) { 11147 mParent = parent; 11148 } else if (parent == null) { 11149 mParent = null; 11150 } else { 11151 throw new RuntimeException("view " + this + " being added, but" 11152 + " it already has a parent"); 11153 } 11154 } 11155 11156 /** 11157 * This is called when the view is attached to a window. At this point it 11158 * has a Surface and will start drawing. Note that this function is 11159 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11160 * however it may be called any time before the first onDraw -- including 11161 * before or after {@link #onMeasure(int, int)}. 11162 * 11163 * @see #onDetachedFromWindow() 11164 */ 11165 protected void onAttachedToWindow() { 11166 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11167 mParent.requestTransparentRegion(this); 11168 } 11169 11170 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11171 initialAwakenScrollBars(); 11172 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11173 } 11174 11175 jumpDrawablesToCurrentState(); 11176 11177 // Order is important here: LayoutDirection MUST be resolved before Padding 11178 // and TextDirection 11179 resolveLayoutDirection(); 11180 resolvePadding(); 11181 resolveTextDirection(); 11182 resolveTextAlignment(); 11183 11184 clearAccessibilityFocus(); 11185 if (isFocused()) { 11186 InputMethodManager imm = InputMethodManager.peekInstance(); 11187 imm.focusIn(this); 11188 } 11189 11190 if (mAttachInfo != null && mDisplayList != null) { 11191 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11192 } 11193 } 11194 11195 /** 11196 * @see #onScreenStateChanged(int) 11197 */ 11198 void dispatchScreenStateChanged(int screenState) { 11199 onScreenStateChanged(screenState); 11200 } 11201 11202 /** 11203 * This method is called whenever the state of the screen this view is 11204 * attached to changes. A state change will usually occurs when the screen 11205 * turns on or off (whether it happens automatically or the user does it 11206 * manually.) 11207 * 11208 * @param screenState The new state of the screen. Can be either 11209 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11210 */ 11211 public void onScreenStateChanged(int screenState) { 11212 } 11213 11214 /** 11215 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11216 */ 11217 private boolean hasRtlSupport() { 11218 return mContext.getApplicationInfo().hasRtlSupport(); 11219 } 11220 11221 /** 11222 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11223 * that the parent directionality can and will be resolved before its children. 11224 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11225 */ 11226 public void resolveLayoutDirection() { 11227 // Clear any previous layout direction resolution 11228 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11229 11230 if (hasRtlSupport()) { 11231 // Set resolved depending on layout direction 11232 switch (getLayoutDirection()) { 11233 case LAYOUT_DIRECTION_INHERIT: 11234 // If this is root view, no need to look at parent's layout dir. 11235 if (canResolveLayoutDirection()) { 11236 ViewGroup viewGroup = ((ViewGroup) mParent); 11237 11238 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11239 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11240 } 11241 } else { 11242 // Nothing to do, LTR by default 11243 } 11244 break; 11245 case LAYOUT_DIRECTION_RTL: 11246 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11247 break; 11248 case LAYOUT_DIRECTION_LOCALE: 11249 if(isLayoutDirectionRtl(Locale.getDefault())) { 11250 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11251 } 11252 break; 11253 default: 11254 // Nothing to do, LTR by default 11255 } 11256 } 11257 11258 // Set to resolved 11259 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11260 onResolvedLayoutDirectionChanged(); 11261 // Resolve padding 11262 resolvePadding(); 11263 } 11264 11265 /** 11266 * Called when layout direction has been resolved. 11267 * 11268 * The default implementation does nothing. 11269 */ 11270 public void onResolvedLayoutDirectionChanged() { 11271 } 11272 11273 /** 11274 * Resolve padding depending on layout direction. 11275 */ 11276 public void resolvePadding() { 11277 // If the user specified the absolute padding (either with android:padding or 11278 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11279 // use the default padding or the padding from the background drawable 11280 // (stored at this point in mPadding*) 11281 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11282 switch (resolvedLayoutDirection) { 11283 case LAYOUT_DIRECTION_RTL: 11284 // Start user padding override Right user padding. Otherwise, if Right user 11285 // padding is not defined, use the default Right padding. If Right user padding 11286 // is defined, just use it. 11287 if (mUserPaddingStart >= 0) { 11288 mUserPaddingRight = mUserPaddingStart; 11289 } else if (mUserPaddingRight < 0) { 11290 mUserPaddingRight = mPaddingRight; 11291 } 11292 if (mUserPaddingEnd >= 0) { 11293 mUserPaddingLeft = mUserPaddingEnd; 11294 } else if (mUserPaddingLeft < 0) { 11295 mUserPaddingLeft = mPaddingLeft; 11296 } 11297 break; 11298 case LAYOUT_DIRECTION_LTR: 11299 default: 11300 // Start user padding override Left user padding. Otherwise, if Left user 11301 // padding is not defined, use the default left padding. If Left user padding 11302 // is defined, just use it. 11303 if (mUserPaddingStart >= 0) { 11304 mUserPaddingLeft = mUserPaddingStart; 11305 } else if (mUserPaddingLeft < 0) { 11306 mUserPaddingLeft = mPaddingLeft; 11307 } 11308 if (mUserPaddingEnd >= 0) { 11309 mUserPaddingRight = mUserPaddingEnd; 11310 } else if (mUserPaddingRight < 0) { 11311 mUserPaddingRight = mPaddingRight; 11312 } 11313 } 11314 11315 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11316 11317 if(isPaddingRelative()) { 11318 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11319 } else { 11320 recomputePadding(); 11321 } 11322 onPaddingChanged(resolvedLayoutDirection); 11323 } 11324 11325 /** 11326 * Resolve padding depending on the layout direction. Subclasses that care about 11327 * padding resolution should override this method. The default implementation does 11328 * nothing. 11329 * 11330 * @param layoutDirection the direction of the layout 11331 * 11332 * @see {@link #LAYOUT_DIRECTION_LTR} 11333 * @see {@link #LAYOUT_DIRECTION_RTL} 11334 */ 11335 public void onPaddingChanged(int layoutDirection) { 11336 } 11337 11338 /** 11339 * Check if layout direction resolution can be done. 11340 * 11341 * @return true if layout direction resolution can be done otherwise return false. 11342 */ 11343 public boolean canResolveLayoutDirection() { 11344 switch (getLayoutDirection()) { 11345 case LAYOUT_DIRECTION_INHERIT: 11346 return (mParent != null) && (mParent instanceof ViewGroup); 11347 default: 11348 return true; 11349 } 11350 } 11351 11352 /** 11353 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11354 * when reset is done. 11355 */ 11356 public void resetResolvedLayoutDirection() { 11357 // Reset the current resolved bits 11358 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11359 onResolvedLayoutDirectionReset(); 11360 // Reset also the text direction 11361 resetResolvedTextDirection(); 11362 } 11363 11364 /** 11365 * Called during reset of resolved layout direction. 11366 * 11367 * Subclasses need to override this method to clear cached information that depends on the 11368 * resolved layout direction, or to inform child views that inherit their layout direction. 11369 * 11370 * The default implementation does nothing. 11371 */ 11372 public void onResolvedLayoutDirectionReset() { 11373 } 11374 11375 /** 11376 * Check if a Locale uses an RTL script. 11377 * 11378 * @param locale Locale to check 11379 * @return true if the Locale uses an RTL script. 11380 */ 11381 protected static boolean isLayoutDirectionRtl(Locale locale) { 11382 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11383 } 11384 11385 /** 11386 * This is called when the view is detached from a window. At this point it 11387 * no longer has a surface for drawing. 11388 * 11389 * @see #onAttachedToWindow() 11390 */ 11391 protected void onDetachedFromWindow() { 11392 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11393 11394 removeUnsetPressCallback(); 11395 removeLongPressCallback(); 11396 removePerformClickCallback(); 11397 removeSendViewScrolledAccessibilityEventCallback(); 11398 11399 destroyDrawingCache(); 11400 11401 destroyLayer(false); 11402 11403 if (mAttachInfo != null) { 11404 if (mDisplayList != null) { 11405 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11406 } 11407 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11408 } else { 11409 if (mDisplayList != null) { 11410 // Should never happen 11411 mDisplayList.invalidate(); 11412 } 11413 } 11414 11415 mCurrentAnimation = null; 11416 11417 resetResolvedLayoutDirection(); 11418 resetResolvedTextAlignment(); 11419 resetAccessibilityStateChanged(); 11420 } 11421 11422 /** 11423 * @return The number of times this view has been attached to a window 11424 */ 11425 protected int getWindowAttachCount() { 11426 return mWindowAttachCount; 11427 } 11428 11429 /** 11430 * Retrieve a unique token identifying the window this view is attached to. 11431 * @return Return the window's token for use in 11432 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11433 */ 11434 public IBinder getWindowToken() { 11435 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11436 } 11437 11438 /** 11439 * Retrieve a unique token identifying the top-level "real" window of 11440 * the window that this view is attached to. That is, this is like 11441 * {@link #getWindowToken}, except if the window this view in is a panel 11442 * window (attached to another containing window), then the token of 11443 * the containing window is returned instead. 11444 * 11445 * @return Returns the associated window token, either 11446 * {@link #getWindowToken()} or the containing window's token. 11447 */ 11448 public IBinder getApplicationWindowToken() { 11449 AttachInfo ai = mAttachInfo; 11450 if (ai != null) { 11451 IBinder appWindowToken = ai.mPanelParentWindowToken; 11452 if (appWindowToken == null) { 11453 appWindowToken = ai.mWindowToken; 11454 } 11455 return appWindowToken; 11456 } 11457 return null; 11458 } 11459 11460 /** 11461 * Retrieve private session object this view hierarchy is using to 11462 * communicate with the window manager. 11463 * @return the session object to communicate with the window manager 11464 */ 11465 /*package*/ IWindowSession getWindowSession() { 11466 return mAttachInfo != null ? mAttachInfo.mSession : null; 11467 } 11468 11469 /** 11470 * @param info the {@link android.view.View.AttachInfo} to associated with 11471 * this view 11472 */ 11473 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11474 //System.out.println("Attached! " + this); 11475 mAttachInfo = info; 11476 mWindowAttachCount++; 11477 // We will need to evaluate the drawable state at least once. 11478 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11479 if (mFloatingTreeObserver != null) { 11480 info.mTreeObserver.merge(mFloatingTreeObserver); 11481 mFloatingTreeObserver = null; 11482 } 11483 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11484 mAttachInfo.mScrollContainers.add(this); 11485 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11486 } 11487 performCollectViewAttributes(mAttachInfo, visibility); 11488 onAttachedToWindow(); 11489 11490 ListenerInfo li = mListenerInfo; 11491 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11492 li != null ? li.mOnAttachStateChangeListeners : null; 11493 if (listeners != null && listeners.size() > 0) { 11494 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11495 // perform the dispatching. The iterator is a safe guard against listeners that 11496 // could mutate the list by calling the various add/remove methods. This prevents 11497 // the array from being modified while we iterate it. 11498 for (OnAttachStateChangeListener listener : listeners) { 11499 listener.onViewAttachedToWindow(this); 11500 } 11501 } 11502 11503 int vis = info.mWindowVisibility; 11504 if (vis != GONE) { 11505 onWindowVisibilityChanged(vis); 11506 } 11507 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11508 // If nobody has evaluated the drawable state yet, then do it now. 11509 refreshDrawableState(); 11510 } 11511 } 11512 11513 void dispatchDetachedFromWindow() { 11514 AttachInfo info = mAttachInfo; 11515 if (info != null) { 11516 int vis = info.mWindowVisibility; 11517 if (vis != GONE) { 11518 onWindowVisibilityChanged(GONE); 11519 } 11520 } 11521 11522 onDetachedFromWindow(); 11523 11524 ListenerInfo li = mListenerInfo; 11525 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11526 li != null ? li.mOnAttachStateChangeListeners : null; 11527 if (listeners != null && listeners.size() > 0) { 11528 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11529 // perform the dispatching. The iterator is a safe guard against listeners that 11530 // could mutate the list by calling the various add/remove methods. This prevents 11531 // the array from being modified while we iterate it. 11532 for (OnAttachStateChangeListener listener : listeners) { 11533 listener.onViewDetachedFromWindow(this); 11534 } 11535 } 11536 11537 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11538 mAttachInfo.mScrollContainers.remove(this); 11539 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11540 } 11541 11542 mAttachInfo = null; 11543 } 11544 11545 /** 11546 * Store this view hierarchy's frozen state into the given container. 11547 * 11548 * @param container The SparseArray in which to save the view's state. 11549 * 11550 * @see #restoreHierarchyState(android.util.SparseArray) 11551 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11552 * @see #onSaveInstanceState() 11553 */ 11554 public void saveHierarchyState(SparseArray<Parcelable> container) { 11555 dispatchSaveInstanceState(container); 11556 } 11557 11558 /** 11559 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11560 * this view and its children. May be overridden to modify how freezing happens to a 11561 * view's children; for example, some views may want to not store state for their children. 11562 * 11563 * @param container The SparseArray in which to save the view's state. 11564 * 11565 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11566 * @see #saveHierarchyState(android.util.SparseArray) 11567 * @see #onSaveInstanceState() 11568 */ 11569 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11570 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11571 mPrivateFlags &= ~SAVE_STATE_CALLED; 11572 Parcelable state = onSaveInstanceState(); 11573 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11574 throw new IllegalStateException( 11575 "Derived class did not call super.onSaveInstanceState()"); 11576 } 11577 if (state != null) { 11578 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11579 // + ": " + state); 11580 container.put(mID, state); 11581 } 11582 } 11583 } 11584 11585 /** 11586 * Hook allowing a view to generate a representation of its internal state 11587 * that can later be used to create a new instance with that same state. 11588 * This state should only contain information that is not persistent or can 11589 * not be reconstructed later. For example, you will never store your 11590 * current position on screen because that will be computed again when a 11591 * new instance of the view is placed in its view hierarchy. 11592 * <p> 11593 * Some examples of things you may store here: the current cursor position 11594 * in a text view (but usually not the text itself since that is stored in a 11595 * content provider or other persistent storage), the currently selected 11596 * item in a list view. 11597 * 11598 * @return Returns a Parcelable object containing the view's current dynamic 11599 * state, or null if there is nothing interesting to save. The 11600 * default implementation returns null. 11601 * @see #onRestoreInstanceState(android.os.Parcelable) 11602 * @see #saveHierarchyState(android.util.SparseArray) 11603 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11604 * @see #setSaveEnabled(boolean) 11605 */ 11606 protected Parcelable onSaveInstanceState() { 11607 mPrivateFlags |= SAVE_STATE_CALLED; 11608 return BaseSavedState.EMPTY_STATE; 11609 } 11610 11611 /** 11612 * Restore this view hierarchy's frozen state from the given container. 11613 * 11614 * @param container The SparseArray which holds previously frozen states. 11615 * 11616 * @see #saveHierarchyState(android.util.SparseArray) 11617 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11618 * @see #onRestoreInstanceState(android.os.Parcelable) 11619 */ 11620 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11621 dispatchRestoreInstanceState(container); 11622 } 11623 11624 /** 11625 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11626 * state for this view and its children. May be overridden to modify how restoring 11627 * happens to a view's children; for example, some views may want to not store state 11628 * for their children. 11629 * 11630 * @param container The SparseArray which holds previously saved state. 11631 * 11632 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11633 * @see #restoreHierarchyState(android.util.SparseArray) 11634 * @see #onRestoreInstanceState(android.os.Parcelable) 11635 */ 11636 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11637 if (mID != NO_ID) { 11638 Parcelable state = container.get(mID); 11639 if (state != null) { 11640 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11641 // + ": " + state); 11642 mPrivateFlags &= ~SAVE_STATE_CALLED; 11643 onRestoreInstanceState(state); 11644 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11645 throw new IllegalStateException( 11646 "Derived class did not call super.onRestoreInstanceState()"); 11647 } 11648 } 11649 } 11650 } 11651 11652 /** 11653 * Hook allowing a view to re-apply a representation of its internal state that had previously 11654 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11655 * null state. 11656 * 11657 * @param state The frozen state that had previously been returned by 11658 * {@link #onSaveInstanceState}. 11659 * 11660 * @see #onSaveInstanceState() 11661 * @see #restoreHierarchyState(android.util.SparseArray) 11662 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11663 */ 11664 protected void onRestoreInstanceState(Parcelable state) { 11665 mPrivateFlags |= SAVE_STATE_CALLED; 11666 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11667 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11668 + "received " + state.getClass().toString() + " instead. This usually happens " 11669 + "when two views of different type have the same id in the same hierarchy. " 11670 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11671 + "other views do not use the same id."); 11672 } 11673 } 11674 11675 /** 11676 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11677 * 11678 * @return the drawing start time in milliseconds 11679 */ 11680 public long getDrawingTime() { 11681 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11682 } 11683 11684 /** 11685 * <p>Enables or disables the duplication of the parent's state into this view. When 11686 * duplication is enabled, this view gets its drawable state from its parent rather 11687 * than from its own internal properties.</p> 11688 * 11689 * <p>Note: in the current implementation, setting this property to true after the 11690 * view was added to a ViewGroup might have no effect at all. This property should 11691 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11692 * 11693 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11694 * property is enabled, an exception will be thrown.</p> 11695 * 11696 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11697 * parent, these states should not be affected by this method.</p> 11698 * 11699 * @param enabled True to enable duplication of the parent's drawable state, false 11700 * to disable it. 11701 * 11702 * @see #getDrawableState() 11703 * @see #isDuplicateParentStateEnabled() 11704 */ 11705 public void setDuplicateParentStateEnabled(boolean enabled) { 11706 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11707 } 11708 11709 /** 11710 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11711 * 11712 * @return True if this view's drawable state is duplicated from the parent, 11713 * false otherwise 11714 * 11715 * @see #getDrawableState() 11716 * @see #setDuplicateParentStateEnabled(boolean) 11717 */ 11718 public boolean isDuplicateParentStateEnabled() { 11719 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11720 } 11721 11722 /** 11723 * <p>Specifies the type of layer backing this view. The layer can be 11724 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11725 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11726 * 11727 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11728 * instance that controls how the layer is composed on screen. The following 11729 * properties of the paint are taken into account when composing the layer:</p> 11730 * <ul> 11731 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11732 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11733 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11734 * </ul> 11735 * 11736 * <p>If this view has an alpha value set to < 1.0 by calling 11737 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11738 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11739 * equivalent to setting a hardware layer on this view and providing a paint with 11740 * the desired alpha value.<p> 11741 * 11742 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11743 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11744 * for more information on when and how to use layers.</p> 11745 * 11746 * @param layerType The ype of layer to use with this view, must be one of 11747 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11748 * {@link #LAYER_TYPE_HARDWARE} 11749 * @param paint The paint used to compose the layer. This argument is optional 11750 * and can be null. It is ignored when the layer type is 11751 * {@link #LAYER_TYPE_NONE} 11752 * 11753 * @see #getLayerType() 11754 * @see #LAYER_TYPE_NONE 11755 * @see #LAYER_TYPE_SOFTWARE 11756 * @see #LAYER_TYPE_HARDWARE 11757 * @see #setAlpha(float) 11758 * 11759 * @attr ref android.R.styleable#View_layerType 11760 */ 11761 public void setLayerType(int layerType, Paint paint) { 11762 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11763 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11764 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11765 } 11766 11767 if (layerType == mLayerType) { 11768 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11769 mLayerPaint = paint == null ? new Paint() : paint; 11770 invalidateParentCaches(); 11771 invalidate(true); 11772 } 11773 return; 11774 } 11775 11776 // Destroy any previous software drawing cache if needed 11777 switch (mLayerType) { 11778 case LAYER_TYPE_HARDWARE: 11779 destroyLayer(false); 11780 // fall through - non-accelerated views may use software layer mechanism instead 11781 case LAYER_TYPE_SOFTWARE: 11782 destroyDrawingCache(); 11783 break; 11784 default: 11785 break; 11786 } 11787 11788 mLayerType = layerType; 11789 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11790 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11791 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11792 11793 invalidateParentCaches(); 11794 invalidate(true); 11795 } 11796 11797 /** 11798 * Indicates whether this view has a static layer. A view with layer type 11799 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11800 * dynamic. 11801 */ 11802 boolean hasStaticLayer() { 11803 return true; 11804 } 11805 11806 /** 11807 * Indicates what type of layer is currently associated with this view. By default 11808 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11809 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11810 * for more information on the different types of layers. 11811 * 11812 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11813 * {@link #LAYER_TYPE_HARDWARE} 11814 * 11815 * @see #setLayerType(int, android.graphics.Paint) 11816 * @see #buildLayer() 11817 * @see #LAYER_TYPE_NONE 11818 * @see #LAYER_TYPE_SOFTWARE 11819 * @see #LAYER_TYPE_HARDWARE 11820 */ 11821 public int getLayerType() { 11822 return mLayerType; 11823 } 11824 11825 /** 11826 * Forces this view's layer to be created and this view to be rendered 11827 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11828 * invoking this method will have no effect. 11829 * 11830 * This method can for instance be used to render a view into its layer before 11831 * starting an animation. If this view is complex, rendering into the layer 11832 * before starting the animation will avoid skipping frames. 11833 * 11834 * @throws IllegalStateException If this view is not attached to a window 11835 * 11836 * @see #setLayerType(int, android.graphics.Paint) 11837 */ 11838 public void buildLayer() { 11839 if (mLayerType == LAYER_TYPE_NONE) return; 11840 11841 if (mAttachInfo == null) { 11842 throw new IllegalStateException("This view must be attached to a window first"); 11843 } 11844 11845 switch (mLayerType) { 11846 case LAYER_TYPE_HARDWARE: 11847 if (mAttachInfo.mHardwareRenderer != null && 11848 mAttachInfo.mHardwareRenderer.isEnabled() && 11849 mAttachInfo.mHardwareRenderer.validate()) { 11850 getHardwareLayer(); 11851 } 11852 break; 11853 case LAYER_TYPE_SOFTWARE: 11854 buildDrawingCache(true); 11855 break; 11856 } 11857 } 11858 11859 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11860 void flushLayer() { 11861 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11862 mHardwareLayer.flush(); 11863 } 11864 } 11865 11866 /** 11867 * <p>Returns a hardware layer that can be used to draw this view again 11868 * without executing its draw method.</p> 11869 * 11870 * @return A HardwareLayer ready to render, or null if an error occurred. 11871 */ 11872 HardwareLayer getHardwareLayer() { 11873 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11874 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11875 return null; 11876 } 11877 11878 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11879 11880 final int width = mRight - mLeft; 11881 final int height = mBottom - mTop; 11882 11883 if (width == 0 || height == 0) { 11884 return null; 11885 } 11886 11887 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11888 if (mHardwareLayer == null) { 11889 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11890 width, height, isOpaque()); 11891 mLocalDirtyRect.set(0, 0, width, height); 11892 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11893 mHardwareLayer.resize(width, height); 11894 mLocalDirtyRect.set(0, 0, width, height); 11895 } 11896 11897 // The layer is not valid if the underlying GPU resources cannot be allocated 11898 if (!mHardwareLayer.isValid()) { 11899 return null; 11900 } 11901 11902 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11903 mLocalDirtyRect.setEmpty(); 11904 } 11905 11906 return mHardwareLayer; 11907 } 11908 11909 /** 11910 * Destroys this View's hardware layer if possible. 11911 * 11912 * @return True if the layer was destroyed, false otherwise. 11913 * 11914 * @see #setLayerType(int, android.graphics.Paint) 11915 * @see #LAYER_TYPE_HARDWARE 11916 */ 11917 boolean destroyLayer(boolean valid) { 11918 if (mHardwareLayer != null) { 11919 AttachInfo info = mAttachInfo; 11920 if (info != null && info.mHardwareRenderer != null && 11921 info.mHardwareRenderer.isEnabled() && 11922 (valid || info.mHardwareRenderer.validate())) { 11923 mHardwareLayer.destroy(); 11924 mHardwareLayer = null; 11925 11926 invalidate(true); 11927 invalidateParentCaches(); 11928 } 11929 return true; 11930 } 11931 return false; 11932 } 11933 11934 /** 11935 * Destroys all hardware rendering resources. This method is invoked 11936 * when the system needs to reclaim resources. Upon execution of this 11937 * method, you should free any OpenGL resources created by the view. 11938 * 11939 * Note: you <strong>must</strong> call 11940 * <code>super.destroyHardwareResources()</code> when overriding 11941 * this method. 11942 * 11943 * @hide 11944 */ 11945 protected void destroyHardwareResources() { 11946 destroyLayer(true); 11947 } 11948 11949 /** 11950 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11951 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11952 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11953 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11954 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11955 * null.</p> 11956 * 11957 * <p>Enabling the drawing cache is similar to 11958 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11959 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11960 * drawing cache has no effect on rendering because the system uses a different mechanism 11961 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11962 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11963 * for information on how to enable software and hardware layers.</p> 11964 * 11965 * <p>This API can be used to manually generate 11966 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11967 * {@link #getDrawingCache()}.</p> 11968 * 11969 * @param enabled true to enable the drawing cache, false otherwise 11970 * 11971 * @see #isDrawingCacheEnabled() 11972 * @see #getDrawingCache() 11973 * @see #buildDrawingCache() 11974 * @see #setLayerType(int, android.graphics.Paint) 11975 */ 11976 public void setDrawingCacheEnabled(boolean enabled) { 11977 mCachingFailed = false; 11978 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11979 } 11980 11981 /** 11982 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11983 * 11984 * @return true if the drawing cache is enabled 11985 * 11986 * @see #setDrawingCacheEnabled(boolean) 11987 * @see #getDrawingCache() 11988 */ 11989 @ViewDebug.ExportedProperty(category = "drawing") 11990 public boolean isDrawingCacheEnabled() { 11991 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11992 } 11993 11994 /** 11995 * Debugging utility which recursively outputs the dirty state of a view and its 11996 * descendants. 11997 * 11998 * @hide 11999 */ 12000 @SuppressWarnings({"UnusedDeclaration"}) 12001 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12002 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12003 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12004 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12005 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12006 if (clear) { 12007 mPrivateFlags &= clearMask; 12008 } 12009 if (this instanceof ViewGroup) { 12010 ViewGroup parent = (ViewGroup) this; 12011 final int count = parent.getChildCount(); 12012 for (int i = 0; i < count; i++) { 12013 final View child = parent.getChildAt(i); 12014 child.outputDirtyFlags(indent + " ", clear, clearMask); 12015 } 12016 } 12017 } 12018 12019 /** 12020 * This method is used by ViewGroup to cause its children to restore or recreate their 12021 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12022 * to recreate its own display list, which would happen if it went through the normal 12023 * draw/dispatchDraw mechanisms. 12024 * 12025 * @hide 12026 */ 12027 protected void dispatchGetDisplayList() {} 12028 12029 /** 12030 * A view that is not attached or hardware accelerated cannot create a display list. 12031 * This method checks these conditions and returns the appropriate result. 12032 * 12033 * @return true if view has the ability to create a display list, false otherwise. 12034 * 12035 * @hide 12036 */ 12037 public boolean canHaveDisplayList() { 12038 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12039 } 12040 12041 /** 12042 * @return The HardwareRenderer associated with that view or null if hardware rendering 12043 * is not supported or this this has not been attached to a window. 12044 * 12045 * @hide 12046 */ 12047 public HardwareRenderer getHardwareRenderer() { 12048 if (mAttachInfo != null) { 12049 return mAttachInfo.mHardwareRenderer; 12050 } 12051 return null; 12052 } 12053 12054 /** 12055 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12056 * Otherwise, the same display list will be returned (after having been rendered into 12057 * along the way, depending on the invalidation state of the view). 12058 * 12059 * @param displayList The previous version of this displayList, could be null. 12060 * @param isLayer Whether the requester of the display list is a layer. If so, 12061 * the view will avoid creating a layer inside the resulting display list. 12062 * @return A new or reused DisplayList object. 12063 */ 12064 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12065 if (!canHaveDisplayList()) { 12066 return null; 12067 } 12068 12069 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12070 displayList == null || !displayList.isValid() || 12071 (!isLayer && mRecreateDisplayList))) { 12072 // Don't need to recreate the display list, just need to tell our 12073 // children to restore/recreate theirs 12074 if (displayList != null && displayList.isValid() && 12075 !isLayer && !mRecreateDisplayList) { 12076 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12077 mPrivateFlags &= ~DIRTY_MASK; 12078 dispatchGetDisplayList(); 12079 12080 return displayList; 12081 } 12082 12083 if (!isLayer) { 12084 // If we got here, we're recreating it. Mark it as such to ensure that 12085 // we copy in child display lists into ours in drawChild() 12086 mRecreateDisplayList = true; 12087 } 12088 if (displayList == null) { 12089 final String name = getClass().getSimpleName(); 12090 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12091 // If we're creating a new display list, make sure our parent gets invalidated 12092 // since they will need to recreate their display list to account for this 12093 // new child display list. 12094 invalidateParentCaches(); 12095 } 12096 12097 boolean caching = false; 12098 final HardwareCanvas canvas = displayList.start(); 12099 int width = mRight - mLeft; 12100 int height = mBottom - mTop; 12101 12102 try { 12103 canvas.setViewport(width, height); 12104 // The dirty rect should always be null for a display list 12105 canvas.onPreDraw(null); 12106 int layerType = ( 12107 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12108 getLayerType() : LAYER_TYPE_NONE; 12109 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12110 if (layerType == LAYER_TYPE_HARDWARE) { 12111 final HardwareLayer layer = getHardwareLayer(); 12112 if (layer != null && layer.isValid()) { 12113 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12114 } else { 12115 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12116 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12117 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12118 } 12119 caching = true; 12120 } else { 12121 buildDrawingCache(true); 12122 Bitmap cache = getDrawingCache(true); 12123 if (cache != null) { 12124 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12125 caching = true; 12126 } 12127 } 12128 } else { 12129 12130 computeScroll(); 12131 12132 canvas.translate(-mScrollX, -mScrollY); 12133 if (!isLayer) { 12134 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12135 mPrivateFlags &= ~DIRTY_MASK; 12136 } 12137 12138 // Fast path for layouts with no backgrounds 12139 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12140 dispatchDraw(canvas); 12141 } else { 12142 draw(canvas); 12143 } 12144 } 12145 } finally { 12146 canvas.onPostDraw(); 12147 12148 displayList.end(); 12149 displayList.setCaching(caching); 12150 if (isLayer) { 12151 displayList.setLeftTopRightBottom(0, 0, width, height); 12152 } else { 12153 setDisplayListProperties(displayList); 12154 } 12155 } 12156 } else if (!isLayer) { 12157 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12158 mPrivateFlags &= ~DIRTY_MASK; 12159 } 12160 12161 return displayList; 12162 } 12163 12164 /** 12165 * Get the DisplayList for the HardwareLayer 12166 * 12167 * @param layer The HardwareLayer whose DisplayList we want 12168 * @return A DisplayList fopr the specified HardwareLayer 12169 */ 12170 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12171 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12172 layer.setDisplayList(displayList); 12173 return displayList; 12174 } 12175 12176 12177 /** 12178 * <p>Returns a display list that can be used to draw this view again 12179 * without executing its draw method.</p> 12180 * 12181 * @return A DisplayList ready to replay, or null if caching is not enabled. 12182 * 12183 * @hide 12184 */ 12185 public DisplayList getDisplayList() { 12186 mDisplayList = getDisplayList(mDisplayList, false); 12187 return mDisplayList; 12188 } 12189 12190 /** 12191 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12192 * 12193 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12194 * 12195 * @see #getDrawingCache(boolean) 12196 */ 12197 public Bitmap getDrawingCache() { 12198 return getDrawingCache(false); 12199 } 12200 12201 /** 12202 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12203 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12204 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12205 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12206 * request the drawing cache by calling this method and draw it on screen if the 12207 * returned bitmap is not null.</p> 12208 * 12209 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12210 * this method will create a bitmap of the same size as this view. Because this bitmap 12211 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12212 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12213 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12214 * size than the view. This implies that your application must be able to handle this 12215 * size.</p> 12216 * 12217 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12218 * the current density of the screen when the application is in compatibility 12219 * mode. 12220 * 12221 * @return A bitmap representing this view or null if cache is disabled. 12222 * 12223 * @see #setDrawingCacheEnabled(boolean) 12224 * @see #isDrawingCacheEnabled() 12225 * @see #buildDrawingCache(boolean) 12226 * @see #destroyDrawingCache() 12227 */ 12228 public Bitmap getDrawingCache(boolean autoScale) { 12229 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12230 return null; 12231 } 12232 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12233 buildDrawingCache(autoScale); 12234 } 12235 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12236 } 12237 12238 /** 12239 * <p>Frees the resources used by the drawing cache. If you call 12240 * {@link #buildDrawingCache()} manually without calling 12241 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12242 * should cleanup the cache with this method afterwards.</p> 12243 * 12244 * @see #setDrawingCacheEnabled(boolean) 12245 * @see #buildDrawingCache() 12246 * @see #getDrawingCache() 12247 */ 12248 public void destroyDrawingCache() { 12249 if (mDrawingCache != null) { 12250 mDrawingCache.recycle(); 12251 mDrawingCache = null; 12252 } 12253 if (mUnscaledDrawingCache != null) { 12254 mUnscaledDrawingCache.recycle(); 12255 mUnscaledDrawingCache = null; 12256 } 12257 } 12258 12259 /** 12260 * Setting a solid background color for the drawing cache's bitmaps will improve 12261 * performance and memory usage. Note, though that this should only be used if this 12262 * view will always be drawn on top of a solid color. 12263 * 12264 * @param color The background color to use for the drawing cache's bitmap 12265 * 12266 * @see #setDrawingCacheEnabled(boolean) 12267 * @see #buildDrawingCache() 12268 * @see #getDrawingCache() 12269 */ 12270 public void setDrawingCacheBackgroundColor(int color) { 12271 if (color != mDrawingCacheBackgroundColor) { 12272 mDrawingCacheBackgroundColor = color; 12273 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12274 } 12275 } 12276 12277 /** 12278 * @see #setDrawingCacheBackgroundColor(int) 12279 * 12280 * @return The background color to used for the drawing cache's bitmap 12281 */ 12282 public int getDrawingCacheBackgroundColor() { 12283 return mDrawingCacheBackgroundColor; 12284 } 12285 12286 /** 12287 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12288 * 12289 * @see #buildDrawingCache(boolean) 12290 */ 12291 public void buildDrawingCache() { 12292 buildDrawingCache(false); 12293 } 12294 12295 /** 12296 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12297 * 12298 * <p>If you call {@link #buildDrawingCache()} manually without calling 12299 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12300 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12301 * 12302 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12303 * this method will create a bitmap of the same size as this view. Because this bitmap 12304 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12305 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12306 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12307 * size than the view. This implies that your application must be able to handle this 12308 * size.</p> 12309 * 12310 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12311 * you do not need the drawing cache bitmap, calling this method will increase memory 12312 * usage and cause the view to be rendered in software once, thus negatively impacting 12313 * performance.</p> 12314 * 12315 * @see #getDrawingCache() 12316 * @see #destroyDrawingCache() 12317 */ 12318 public void buildDrawingCache(boolean autoScale) { 12319 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12320 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12321 mCachingFailed = false; 12322 12323 if (ViewDebug.TRACE_HIERARCHY) { 12324 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12325 } 12326 12327 int width = mRight - mLeft; 12328 int height = mBottom - mTop; 12329 12330 final AttachInfo attachInfo = mAttachInfo; 12331 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12332 12333 if (autoScale && scalingRequired) { 12334 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12335 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12336 } 12337 12338 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12339 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12340 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12341 12342 if (width <= 0 || height <= 0 || 12343 // Projected bitmap size in bytes 12344 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12345 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12346 destroyDrawingCache(); 12347 mCachingFailed = true; 12348 return; 12349 } 12350 12351 boolean clear = true; 12352 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12353 12354 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12355 Bitmap.Config quality; 12356 if (!opaque) { 12357 // Never pick ARGB_4444 because it looks awful 12358 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12359 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12360 case DRAWING_CACHE_QUALITY_AUTO: 12361 quality = Bitmap.Config.ARGB_8888; 12362 break; 12363 case DRAWING_CACHE_QUALITY_LOW: 12364 quality = Bitmap.Config.ARGB_8888; 12365 break; 12366 case DRAWING_CACHE_QUALITY_HIGH: 12367 quality = Bitmap.Config.ARGB_8888; 12368 break; 12369 default: 12370 quality = Bitmap.Config.ARGB_8888; 12371 break; 12372 } 12373 } else { 12374 // Optimization for translucent windows 12375 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12376 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12377 } 12378 12379 // Try to cleanup memory 12380 if (bitmap != null) bitmap.recycle(); 12381 12382 try { 12383 bitmap = Bitmap.createBitmap(width, height, quality); 12384 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12385 if (autoScale) { 12386 mDrawingCache = bitmap; 12387 } else { 12388 mUnscaledDrawingCache = bitmap; 12389 } 12390 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12391 } catch (OutOfMemoryError e) { 12392 // If there is not enough memory to create the bitmap cache, just 12393 // ignore the issue as bitmap caches are not required to draw the 12394 // view hierarchy 12395 if (autoScale) { 12396 mDrawingCache = null; 12397 } else { 12398 mUnscaledDrawingCache = null; 12399 } 12400 mCachingFailed = true; 12401 return; 12402 } 12403 12404 clear = drawingCacheBackgroundColor != 0; 12405 } 12406 12407 Canvas canvas; 12408 if (attachInfo != null) { 12409 canvas = attachInfo.mCanvas; 12410 if (canvas == null) { 12411 canvas = new Canvas(); 12412 } 12413 canvas.setBitmap(bitmap); 12414 // Temporarily clobber the cached Canvas in case one of our children 12415 // is also using a drawing cache. Without this, the children would 12416 // steal the canvas by attaching their own bitmap to it and bad, bad 12417 // thing would happen (invisible views, corrupted drawings, etc.) 12418 attachInfo.mCanvas = null; 12419 } else { 12420 // This case should hopefully never or seldom happen 12421 canvas = new Canvas(bitmap); 12422 } 12423 12424 if (clear) { 12425 bitmap.eraseColor(drawingCacheBackgroundColor); 12426 } 12427 12428 computeScroll(); 12429 final int restoreCount = canvas.save(); 12430 12431 if (autoScale && scalingRequired) { 12432 final float scale = attachInfo.mApplicationScale; 12433 canvas.scale(scale, scale); 12434 } 12435 12436 canvas.translate(-mScrollX, -mScrollY); 12437 12438 mPrivateFlags |= DRAWN; 12439 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12440 mLayerType != LAYER_TYPE_NONE) { 12441 mPrivateFlags |= DRAWING_CACHE_VALID; 12442 } 12443 12444 // Fast path for layouts with no backgrounds 12445 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12446 if (ViewDebug.TRACE_HIERARCHY) { 12447 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12448 } 12449 mPrivateFlags &= ~DIRTY_MASK; 12450 dispatchDraw(canvas); 12451 } else { 12452 draw(canvas); 12453 } 12454 12455 canvas.restoreToCount(restoreCount); 12456 canvas.setBitmap(null); 12457 12458 if (attachInfo != null) { 12459 // Restore the cached Canvas for our siblings 12460 attachInfo.mCanvas = canvas; 12461 } 12462 } 12463 } 12464 12465 /** 12466 * Create a snapshot of the view into a bitmap. We should probably make 12467 * some form of this public, but should think about the API. 12468 */ 12469 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12470 int width = mRight - mLeft; 12471 int height = mBottom - mTop; 12472 12473 final AttachInfo attachInfo = mAttachInfo; 12474 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12475 width = (int) ((width * scale) + 0.5f); 12476 height = (int) ((height * scale) + 0.5f); 12477 12478 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12479 if (bitmap == null) { 12480 throw new OutOfMemoryError(); 12481 } 12482 12483 Resources resources = getResources(); 12484 if (resources != null) { 12485 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12486 } 12487 12488 Canvas canvas; 12489 if (attachInfo != null) { 12490 canvas = attachInfo.mCanvas; 12491 if (canvas == null) { 12492 canvas = new Canvas(); 12493 } 12494 canvas.setBitmap(bitmap); 12495 // Temporarily clobber the cached Canvas in case one of our children 12496 // is also using a drawing cache. Without this, the children would 12497 // steal the canvas by attaching their own bitmap to it and bad, bad 12498 // things would happen (invisible views, corrupted drawings, etc.) 12499 attachInfo.mCanvas = null; 12500 } else { 12501 // This case should hopefully never or seldom happen 12502 canvas = new Canvas(bitmap); 12503 } 12504 12505 if ((backgroundColor & 0xff000000) != 0) { 12506 bitmap.eraseColor(backgroundColor); 12507 } 12508 12509 computeScroll(); 12510 final int restoreCount = canvas.save(); 12511 canvas.scale(scale, scale); 12512 canvas.translate(-mScrollX, -mScrollY); 12513 12514 // Temporarily remove the dirty mask 12515 int flags = mPrivateFlags; 12516 mPrivateFlags &= ~DIRTY_MASK; 12517 12518 // Fast path for layouts with no backgrounds 12519 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12520 dispatchDraw(canvas); 12521 } else { 12522 draw(canvas); 12523 } 12524 12525 mPrivateFlags = flags; 12526 12527 canvas.restoreToCount(restoreCount); 12528 canvas.setBitmap(null); 12529 12530 if (attachInfo != null) { 12531 // Restore the cached Canvas for our siblings 12532 attachInfo.mCanvas = canvas; 12533 } 12534 12535 return bitmap; 12536 } 12537 12538 /** 12539 * Indicates whether this View is currently in edit mode. A View is usually 12540 * in edit mode when displayed within a developer tool. For instance, if 12541 * this View is being drawn by a visual user interface builder, this method 12542 * should return true. 12543 * 12544 * Subclasses should check the return value of this method to provide 12545 * different behaviors if their normal behavior might interfere with the 12546 * host environment. For instance: the class spawns a thread in its 12547 * constructor, the drawing code relies on device-specific features, etc. 12548 * 12549 * This method is usually checked in the drawing code of custom widgets. 12550 * 12551 * @return True if this View is in edit mode, false otherwise. 12552 */ 12553 public boolean isInEditMode() { 12554 return false; 12555 } 12556 12557 /** 12558 * If the View draws content inside its padding and enables fading edges, 12559 * it needs to support padding offsets. Padding offsets are added to the 12560 * fading edges to extend the length of the fade so that it covers pixels 12561 * drawn inside the padding. 12562 * 12563 * Subclasses of this class should override this method if they need 12564 * to draw content inside the padding. 12565 * 12566 * @return True if padding offset must be applied, false otherwise. 12567 * 12568 * @see #getLeftPaddingOffset() 12569 * @see #getRightPaddingOffset() 12570 * @see #getTopPaddingOffset() 12571 * @see #getBottomPaddingOffset() 12572 * 12573 * @since CURRENT 12574 */ 12575 protected boolean isPaddingOffsetRequired() { 12576 return false; 12577 } 12578 12579 /** 12580 * Amount by which to extend the left fading region. Called only when 12581 * {@link #isPaddingOffsetRequired()} returns true. 12582 * 12583 * @return The left padding offset in pixels. 12584 * 12585 * @see #isPaddingOffsetRequired() 12586 * 12587 * @since CURRENT 12588 */ 12589 protected int getLeftPaddingOffset() { 12590 return 0; 12591 } 12592 12593 /** 12594 * Amount by which to extend the right fading region. Called only when 12595 * {@link #isPaddingOffsetRequired()} returns true. 12596 * 12597 * @return The right padding offset in pixels. 12598 * 12599 * @see #isPaddingOffsetRequired() 12600 * 12601 * @since CURRENT 12602 */ 12603 protected int getRightPaddingOffset() { 12604 return 0; 12605 } 12606 12607 /** 12608 * Amount by which to extend the top fading region. Called only when 12609 * {@link #isPaddingOffsetRequired()} returns true. 12610 * 12611 * @return The top padding offset in pixels. 12612 * 12613 * @see #isPaddingOffsetRequired() 12614 * 12615 * @since CURRENT 12616 */ 12617 protected int getTopPaddingOffset() { 12618 return 0; 12619 } 12620 12621 /** 12622 * Amount by which to extend the bottom fading region. Called only when 12623 * {@link #isPaddingOffsetRequired()} returns true. 12624 * 12625 * @return The bottom padding offset in pixels. 12626 * 12627 * @see #isPaddingOffsetRequired() 12628 * 12629 * @since CURRENT 12630 */ 12631 protected int getBottomPaddingOffset() { 12632 return 0; 12633 } 12634 12635 /** 12636 * @hide 12637 * @param offsetRequired 12638 */ 12639 protected int getFadeTop(boolean offsetRequired) { 12640 int top = mPaddingTop; 12641 if (offsetRequired) top += getTopPaddingOffset(); 12642 return top; 12643 } 12644 12645 /** 12646 * @hide 12647 * @param offsetRequired 12648 */ 12649 protected int getFadeHeight(boolean offsetRequired) { 12650 int padding = mPaddingTop; 12651 if (offsetRequired) padding += getTopPaddingOffset(); 12652 return mBottom - mTop - mPaddingBottom - padding; 12653 } 12654 12655 /** 12656 * <p>Indicates whether this view is attached to a hardware accelerated 12657 * window or not.</p> 12658 * 12659 * <p>Even if this method returns true, it does not mean that every call 12660 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12661 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12662 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12663 * window is hardware accelerated, 12664 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12665 * return false, and this method will return true.</p> 12666 * 12667 * @return True if the view is attached to a window and the window is 12668 * hardware accelerated; false in any other case. 12669 */ 12670 public boolean isHardwareAccelerated() { 12671 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12672 } 12673 12674 /** 12675 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12676 * case of an active Animation being run on the view. 12677 */ 12678 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12679 Animation a, boolean scalingRequired) { 12680 Transformation invalidationTransform; 12681 final int flags = parent.mGroupFlags; 12682 final boolean initialized = a.isInitialized(); 12683 if (!initialized) { 12684 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12685 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12686 onAnimationStart(); 12687 } 12688 12689 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12690 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12691 if (parent.mInvalidationTransformation == null) { 12692 parent.mInvalidationTransformation = new Transformation(); 12693 } 12694 invalidationTransform = parent.mInvalidationTransformation; 12695 a.getTransformation(drawingTime, invalidationTransform, 1f); 12696 } else { 12697 invalidationTransform = parent.mChildTransformation; 12698 } 12699 if (more) { 12700 if (!a.willChangeBounds()) { 12701 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12702 parent.FLAG_OPTIMIZE_INVALIDATE) { 12703 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12704 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12705 // The child need to draw an animation, potentially offscreen, so 12706 // make sure we do not cancel invalidate requests 12707 parent.mPrivateFlags |= DRAW_ANIMATION; 12708 parent.invalidate(mLeft, mTop, mRight, mBottom); 12709 } 12710 } else { 12711 if (parent.mInvalidateRegion == null) { 12712 parent.mInvalidateRegion = new RectF(); 12713 } 12714 final RectF region = parent.mInvalidateRegion; 12715 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12716 invalidationTransform); 12717 12718 // The child need to draw an animation, potentially offscreen, so 12719 // make sure we do not cancel invalidate requests 12720 parent.mPrivateFlags |= DRAW_ANIMATION; 12721 12722 final int left = mLeft + (int) region.left; 12723 final int top = mTop + (int) region.top; 12724 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12725 top + (int) (region.height() + .5f)); 12726 } 12727 } 12728 return more; 12729 } 12730 12731 /** 12732 * This method is called by getDisplayList() when a display list is created or re-rendered. 12733 * It sets or resets the current value of all properties on that display list (resetting is 12734 * necessary when a display list is being re-created, because we need to make sure that 12735 * previously-set transform values 12736 */ 12737 void setDisplayListProperties(DisplayList displayList) { 12738 if (displayList != null) { 12739 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12740 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12741 if (mParent instanceof ViewGroup) { 12742 displayList.setClipChildren( 12743 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12744 } 12745 float alpha = 1; 12746 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12747 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12748 ViewGroup parentVG = (ViewGroup) mParent; 12749 final boolean hasTransform = 12750 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12751 if (hasTransform) { 12752 Transformation transform = parentVG.mChildTransformation; 12753 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12754 if (transformType != Transformation.TYPE_IDENTITY) { 12755 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12756 alpha = transform.getAlpha(); 12757 } 12758 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12759 displayList.setStaticMatrix(transform.getMatrix()); 12760 } 12761 } 12762 } 12763 } 12764 if (mTransformationInfo != null) { 12765 alpha *= mTransformationInfo.mAlpha; 12766 if (alpha < 1) { 12767 final int multipliedAlpha = (int) (255 * alpha); 12768 if (onSetAlpha(multipliedAlpha)) { 12769 alpha = 1; 12770 } 12771 } 12772 displayList.setTransformationInfo(alpha, 12773 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12774 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12775 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12776 mTransformationInfo.mScaleY); 12777 if (mTransformationInfo.mCamera == null) { 12778 mTransformationInfo.mCamera = new Camera(); 12779 mTransformationInfo.matrix3D = new Matrix(); 12780 } 12781 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12782 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12783 displayList.setPivotX(getPivotX()); 12784 displayList.setPivotY(getPivotY()); 12785 } 12786 } else if (alpha < 1) { 12787 displayList.setAlpha(alpha); 12788 } 12789 } 12790 } 12791 12792 /** 12793 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12794 * This draw() method is an implementation detail and is not intended to be overridden or 12795 * to be called from anywhere else other than ViewGroup.drawChild(). 12796 */ 12797 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12798 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12799 boolean more = false; 12800 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12801 final int flags = parent.mGroupFlags; 12802 12803 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12804 parent.mChildTransformation.clear(); 12805 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12806 } 12807 12808 Transformation transformToApply = null; 12809 boolean concatMatrix = false; 12810 12811 boolean scalingRequired = false; 12812 boolean caching; 12813 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12814 12815 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12816 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12817 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12818 caching = true; 12819 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12820 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12821 } else { 12822 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12823 } 12824 12825 final Animation a = getAnimation(); 12826 if (a != null) { 12827 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12828 concatMatrix = a.willChangeTransformationMatrix(); 12829 if (concatMatrix) { 12830 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12831 } 12832 transformToApply = parent.mChildTransformation; 12833 } else { 12834 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12835 mDisplayList != null) { 12836 // No longer animating: clear out old animation matrix 12837 mDisplayList.setAnimationMatrix(null); 12838 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12839 } 12840 if (!useDisplayListProperties && 12841 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12842 final boolean hasTransform = 12843 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12844 if (hasTransform) { 12845 final int transformType = parent.mChildTransformation.getTransformationType(); 12846 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12847 parent.mChildTransformation : null; 12848 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12849 } 12850 } 12851 } 12852 12853 concatMatrix |= !childHasIdentityMatrix; 12854 12855 // Sets the flag as early as possible to allow draw() implementations 12856 // to call invalidate() successfully when doing animations 12857 mPrivateFlags |= DRAWN; 12858 12859 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12860 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12861 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12862 return more; 12863 } 12864 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12865 12866 if (hardwareAccelerated) { 12867 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12868 // retain the flag's value temporarily in the mRecreateDisplayList flag 12869 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12870 mPrivateFlags &= ~INVALIDATED; 12871 } 12872 12873 computeScroll(); 12874 12875 final int sx = mScrollX; 12876 final int sy = mScrollY; 12877 12878 DisplayList displayList = null; 12879 Bitmap cache = null; 12880 boolean hasDisplayList = false; 12881 if (caching) { 12882 if (!hardwareAccelerated) { 12883 if (layerType != LAYER_TYPE_NONE) { 12884 layerType = LAYER_TYPE_SOFTWARE; 12885 buildDrawingCache(true); 12886 } 12887 cache = getDrawingCache(true); 12888 } else { 12889 switch (layerType) { 12890 case LAYER_TYPE_SOFTWARE: 12891 if (useDisplayListProperties) { 12892 hasDisplayList = canHaveDisplayList(); 12893 } else { 12894 buildDrawingCache(true); 12895 cache = getDrawingCache(true); 12896 } 12897 break; 12898 case LAYER_TYPE_HARDWARE: 12899 if (useDisplayListProperties) { 12900 hasDisplayList = canHaveDisplayList(); 12901 } 12902 break; 12903 case LAYER_TYPE_NONE: 12904 // Delay getting the display list until animation-driven alpha values are 12905 // set up and possibly passed on to the view 12906 hasDisplayList = canHaveDisplayList(); 12907 break; 12908 } 12909 } 12910 } 12911 useDisplayListProperties &= hasDisplayList; 12912 if (useDisplayListProperties) { 12913 displayList = getDisplayList(); 12914 if (!displayList.isValid()) { 12915 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12916 // to getDisplayList(), the display list will be marked invalid and we should not 12917 // try to use it again. 12918 displayList = null; 12919 hasDisplayList = false; 12920 useDisplayListProperties = false; 12921 } 12922 } 12923 12924 final boolean hasNoCache = cache == null || hasDisplayList; 12925 final boolean offsetForScroll = cache == null && !hasDisplayList && 12926 layerType != LAYER_TYPE_HARDWARE; 12927 12928 int restoreTo = -1; 12929 if (!useDisplayListProperties || transformToApply != null) { 12930 restoreTo = canvas.save(); 12931 } 12932 if (offsetForScroll) { 12933 canvas.translate(mLeft - sx, mTop - sy); 12934 } else { 12935 if (!useDisplayListProperties) { 12936 canvas.translate(mLeft, mTop); 12937 } 12938 if (scalingRequired) { 12939 if (useDisplayListProperties) { 12940 // TODO: Might not need this if we put everything inside the DL 12941 restoreTo = canvas.save(); 12942 } 12943 // mAttachInfo cannot be null, otherwise scalingRequired == false 12944 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12945 canvas.scale(scale, scale); 12946 } 12947 } 12948 12949 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12950 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12951 if (transformToApply != null || !childHasIdentityMatrix) { 12952 int transX = 0; 12953 int transY = 0; 12954 12955 if (offsetForScroll) { 12956 transX = -sx; 12957 transY = -sy; 12958 } 12959 12960 if (transformToApply != null) { 12961 if (concatMatrix) { 12962 if (useDisplayListProperties) { 12963 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12964 } else { 12965 // Undo the scroll translation, apply the transformation matrix, 12966 // then redo the scroll translate to get the correct result. 12967 canvas.translate(-transX, -transY); 12968 canvas.concat(transformToApply.getMatrix()); 12969 canvas.translate(transX, transY); 12970 } 12971 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12972 } 12973 12974 float transformAlpha = transformToApply.getAlpha(); 12975 if (transformAlpha < 1) { 12976 alpha *= transformToApply.getAlpha(); 12977 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12978 } 12979 } 12980 12981 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12982 canvas.translate(-transX, -transY); 12983 canvas.concat(getMatrix()); 12984 canvas.translate(transX, transY); 12985 } 12986 } 12987 12988 if (alpha < 1) { 12989 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12990 if (hasNoCache) { 12991 final int multipliedAlpha = (int) (255 * alpha); 12992 if (!onSetAlpha(multipliedAlpha)) { 12993 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12994 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12995 layerType != LAYER_TYPE_NONE) { 12996 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12997 } 12998 if (useDisplayListProperties) { 12999 displayList.setAlpha(alpha * getAlpha()); 13000 } else if (layerType == LAYER_TYPE_NONE) { 13001 final int scrollX = hasDisplayList ? 0 : sx; 13002 final int scrollY = hasDisplayList ? 0 : sy; 13003 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13004 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13005 } 13006 } else { 13007 // Alpha is handled by the child directly, clobber the layer's alpha 13008 mPrivateFlags |= ALPHA_SET; 13009 } 13010 } 13011 } 13012 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13013 onSetAlpha(255); 13014 mPrivateFlags &= ~ALPHA_SET; 13015 } 13016 13017 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13018 !useDisplayListProperties) { 13019 if (offsetForScroll) { 13020 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13021 } else { 13022 if (!scalingRequired || cache == null) { 13023 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13024 } else { 13025 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13026 } 13027 } 13028 } 13029 13030 if (!useDisplayListProperties && hasDisplayList) { 13031 displayList = getDisplayList(); 13032 if (!displayList.isValid()) { 13033 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13034 // to getDisplayList(), the display list will be marked invalid and we should not 13035 // try to use it again. 13036 displayList = null; 13037 hasDisplayList = false; 13038 } 13039 } 13040 13041 if (hasNoCache) { 13042 boolean layerRendered = false; 13043 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13044 final HardwareLayer layer = getHardwareLayer(); 13045 if (layer != null && layer.isValid()) { 13046 mLayerPaint.setAlpha((int) (alpha * 255)); 13047 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13048 layerRendered = true; 13049 } else { 13050 final int scrollX = hasDisplayList ? 0 : sx; 13051 final int scrollY = hasDisplayList ? 0 : sy; 13052 canvas.saveLayer(scrollX, scrollY, 13053 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13054 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13055 } 13056 } 13057 13058 if (!layerRendered) { 13059 if (!hasDisplayList) { 13060 // Fast path for layouts with no backgrounds 13061 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13062 if (ViewDebug.TRACE_HIERARCHY) { 13063 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 13064 } 13065 mPrivateFlags &= ~DIRTY_MASK; 13066 dispatchDraw(canvas); 13067 } else { 13068 draw(canvas); 13069 } 13070 } else { 13071 mPrivateFlags &= ~DIRTY_MASK; 13072 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13073 } 13074 } 13075 } else if (cache != null) { 13076 mPrivateFlags &= ~DIRTY_MASK; 13077 Paint cachePaint; 13078 13079 if (layerType == LAYER_TYPE_NONE) { 13080 cachePaint = parent.mCachePaint; 13081 if (cachePaint == null) { 13082 cachePaint = new Paint(); 13083 cachePaint.setDither(false); 13084 parent.mCachePaint = cachePaint; 13085 } 13086 if (alpha < 1) { 13087 cachePaint.setAlpha((int) (alpha * 255)); 13088 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13089 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13090 cachePaint.setAlpha(255); 13091 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13092 } 13093 } else { 13094 cachePaint = mLayerPaint; 13095 cachePaint.setAlpha((int) (alpha * 255)); 13096 } 13097 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13098 } 13099 13100 if (restoreTo >= 0) { 13101 canvas.restoreToCount(restoreTo); 13102 } 13103 13104 if (a != null && !more) { 13105 if (!hardwareAccelerated && !a.getFillAfter()) { 13106 onSetAlpha(255); 13107 } 13108 parent.finishAnimatingView(this, a); 13109 } 13110 13111 if (more && hardwareAccelerated) { 13112 // invalidation is the trigger to recreate display lists, so if we're using 13113 // display lists to render, force an invalidate to allow the animation to 13114 // continue drawing another frame 13115 parent.invalidate(true); 13116 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13117 // alpha animations should cause the child to recreate its display list 13118 invalidate(true); 13119 } 13120 } 13121 13122 mRecreateDisplayList = false; 13123 13124 return more; 13125 } 13126 13127 /** 13128 * Manually render this view (and all of its children) to the given Canvas. 13129 * The view must have already done a full layout before this function is 13130 * called. When implementing a view, implement 13131 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13132 * If you do need to override this method, call the superclass version. 13133 * 13134 * @param canvas The Canvas to which the View is rendered. 13135 */ 13136 public void draw(Canvas canvas) { 13137 if (ViewDebug.TRACE_HIERARCHY) { 13138 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13139 } 13140 13141 final int privateFlags = mPrivateFlags; 13142 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13143 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13144 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13145 13146 /* 13147 * Draw traversal performs several drawing steps which must be executed 13148 * in the appropriate order: 13149 * 13150 * 1. Draw the background 13151 * 2. If necessary, save the canvas' layers to prepare for fading 13152 * 3. Draw view's content 13153 * 4. Draw children 13154 * 5. If necessary, draw the fading edges and restore layers 13155 * 6. Draw decorations (scrollbars for instance) 13156 */ 13157 13158 // Step 1, draw the background, if needed 13159 int saveCount; 13160 13161 if (!dirtyOpaque) { 13162 final Drawable background = mBackground; 13163 if (background != null) { 13164 final int scrollX = mScrollX; 13165 final int scrollY = mScrollY; 13166 13167 if (mBackgroundSizeChanged) { 13168 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13169 mBackgroundSizeChanged = false; 13170 } 13171 13172 if ((scrollX | scrollY) == 0) { 13173 background.draw(canvas); 13174 } else { 13175 canvas.translate(scrollX, scrollY); 13176 background.draw(canvas); 13177 canvas.translate(-scrollX, -scrollY); 13178 } 13179 } 13180 } 13181 13182 // skip step 2 & 5 if possible (common case) 13183 final int viewFlags = mViewFlags; 13184 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13185 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13186 if (!verticalEdges && !horizontalEdges) { 13187 // Step 3, draw the content 13188 if (!dirtyOpaque) onDraw(canvas); 13189 13190 // Step 4, draw the children 13191 dispatchDraw(canvas); 13192 13193 // Step 6, draw decorations (scrollbars) 13194 onDrawScrollBars(canvas); 13195 13196 // we're done... 13197 return; 13198 } 13199 13200 /* 13201 * Here we do the full fledged routine... 13202 * (this is an uncommon case where speed matters less, 13203 * this is why we repeat some of the tests that have been 13204 * done above) 13205 */ 13206 13207 boolean drawTop = false; 13208 boolean drawBottom = false; 13209 boolean drawLeft = false; 13210 boolean drawRight = false; 13211 13212 float topFadeStrength = 0.0f; 13213 float bottomFadeStrength = 0.0f; 13214 float leftFadeStrength = 0.0f; 13215 float rightFadeStrength = 0.0f; 13216 13217 // Step 2, save the canvas' layers 13218 int paddingLeft = mPaddingLeft; 13219 13220 final boolean offsetRequired = isPaddingOffsetRequired(); 13221 if (offsetRequired) { 13222 paddingLeft += getLeftPaddingOffset(); 13223 } 13224 13225 int left = mScrollX + paddingLeft; 13226 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13227 int top = mScrollY + getFadeTop(offsetRequired); 13228 int bottom = top + getFadeHeight(offsetRequired); 13229 13230 if (offsetRequired) { 13231 right += getRightPaddingOffset(); 13232 bottom += getBottomPaddingOffset(); 13233 } 13234 13235 final ScrollabilityCache scrollabilityCache = mScrollCache; 13236 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13237 int length = (int) fadeHeight; 13238 13239 // clip the fade length if top and bottom fades overlap 13240 // overlapping fades produce odd-looking artifacts 13241 if (verticalEdges && (top + length > bottom - length)) { 13242 length = (bottom - top) / 2; 13243 } 13244 13245 // also clip horizontal fades if necessary 13246 if (horizontalEdges && (left + length > right - length)) { 13247 length = (right - left) / 2; 13248 } 13249 13250 if (verticalEdges) { 13251 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13252 drawTop = topFadeStrength * fadeHeight > 1.0f; 13253 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13254 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13255 } 13256 13257 if (horizontalEdges) { 13258 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13259 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13260 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13261 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13262 } 13263 13264 saveCount = canvas.getSaveCount(); 13265 13266 int solidColor = getSolidColor(); 13267 if (solidColor == 0) { 13268 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13269 13270 if (drawTop) { 13271 canvas.saveLayer(left, top, right, top + length, null, flags); 13272 } 13273 13274 if (drawBottom) { 13275 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13276 } 13277 13278 if (drawLeft) { 13279 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13280 } 13281 13282 if (drawRight) { 13283 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13284 } 13285 } else { 13286 scrollabilityCache.setFadeColor(solidColor); 13287 } 13288 13289 // Step 3, draw the content 13290 if (!dirtyOpaque) onDraw(canvas); 13291 13292 // Step 4, draw the children 13293 dispatchDraw(canvas); 13294 13295 // Step 5, draw the fade effect and restore layers 13296 final Paint p = scrollabilityCache.paint; 13297 final Matrix matrix = scrollabilityCache.matrix; 13298 final Shader fade = scrollabilityCache.shader; 13299 13300 if (drawTop) { 13301 matrix.setScale(1, fadeHeight * topFadeStrength); 13302 matrix.postTranslate(left, top); 13303 fade.setLocalMatrix(matrix); 13304 canvas.drawRect(left, top, right, top + length, p); 13305 } 13306 13307 if (drawBottom) { 13308 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13309 matrix.postRotate(180); 13310 matrix.postTranslate(left, bottom); 13311 fade.setLocalMatrix(matrix); 13312 canvas.drawRect(left, bottom - length, right, bottom, p); 13313 } 13314 13315 if (drawLeft) { 13316 matrix.setScale(1, fadeHeight * leftFadeStrength); 13317 matrix.postRotate(-90); 13318 matrix.postTranslate(left, top); 13319 fade.setLocalMatrix(matrix); 13320 canvas.drawRect(left, top, left + length, bottom, p); 13321 } 13322 13323 if (drawRight) { 13324 matrix.setScale(1, fadeHeight * rightFadeStrength); 13325 matrix.postRotate(90); 13326 matrix.postTranslate(right, top); 13327 fade.setLocalMatrix(matrix); 13328 canvas.drawRect(right - length, top, right, bottom, p); 13329 } 13330 13331 canvas.restoreToCount(saveCount); 13332 13333 // Step 6, draw decorations (scrollbars) 13334 onDrawScrollBars(canvas); 13335 } 13336 13337 /** 13338 * Override this if your view is known to always be drawn on top of a solid color background, 13339 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13340 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13341 * should be set to 0xFF. 13342 * 13343 * @see #setVerticalFadingEdgeEnabled(boolean) 13344 * @see #setHorizontalFadingEdgeEnabled(boolean) 13345 * 13346 * @return The known solid color background for this view, or 0 if the color may vary 13347 */ 13348 @ViewDebug.ExportedProperty(category = "drawing") 13349 public int getSolidColor() { 13350 return 0; 13351 } 13352 13353 /** 13354 * Build a human readable string representation of the specified view flags. 13355 * 13356 * @param flags the view flags to convert to a string 13357 * @return a String representing the supplied flags 13358 */ 13359 private static String printFlags(int flags) { 13360 String output = ""; 13361 int numFlags = 0; 13362 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13363 output += "TAKES_FOCUS"; 13364 numFlags++; 13365 } 13366 13367 switch (flags & VISIBILITY_MASK) { 13368 case INVISIBLE: 13369 if (numFlags > 0) { 13370 output += " "; 13371 } 13372 output += "INVISIBLE"; 13373 // USELESS HERE numFlags++; 13374 break; 13375 case GONE: 13376 if (numFlags > 0) { 13377 output += " "; 13378 } 13379 output += "GONE"; 13380 // USELESS HERE numFlags++; 13381 break; 13382 default: 13383 break; 13384 } 13385 return output; 13386 } 13387 13388 /** 13389 * Build a human readable string representation of the specified private 13390 * view flags. 13391 * 13392 * @param privateFlags the private view flags to convert to a string 13393 * @return a String representing the supplied flags 13394 */ 13395 private static String printPrivateFlags(int privateFlags) { 13396 String output = ""; 13397 int numFlags = 0; 13398 13399 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13400 output += "WANTS_FOCUS"; 13401 numFlags++; 13402 } 13403 13404 if ((privateFlags & FOCUSED) == FOCUSED) { 13405 if (numFlags > 0) { 13406 output += " "; 13407 } 13408 output += "FOCUSED"; 13409 numFlags++; 13410 } 13411 13412 if ((privateFlags & SELECTED) == SELECTED) { 13413 if (numFlags > 0) { 13414 output += " "; 13415 } 13416 output += "SELECTED"; 13417 numFlags++; 13418 } 13419 13420 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13421 if (numFlags > 0) { 13422 output += " "; 13423 } 13424 output += "IS_ROOT_NAMESPACE"; 13425 numFlags++; 13426 } 13427 13428 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13429 if (numFlags > 0) { 13430 output += " "; 13431 } 13432 output += "HAS_BOUNDS"; 13433 numFlags++; 13434 } 13435 13436 if ((privateFlags & DRAWN) == DRAWN) { 13437 if (numFlags > 0) { 13438 output += " "; 13439 } 13440 output += "DRAWN"; 13441 // USELESS HERE numFlags++; 13442 } 13443 return output; 13444 } 13445 13446 /** 13447 * <p>Indicates whether or not this view's layout will be requested during 13448 * the next hierarchy layout pass.</p> 13449 * 13450 * @return true if the layout will be forced during next layout pass 13451 */ 13452 public boolean isLayoutRequested() { 13453 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13454 } 13455 13456 /** 13457 * Assign a size and position to a view and all of its 13458 * descendants 13459 * 13460 * <p>This is the second phase of the layout mechanism. 13461 * (The first is measuring). In this phase, each parent calls 13462 * layout on all of its children to position them. 13463 * This is typically done using the child measurements 13464 * that were stored in the measure pass().</p> 13465 * 13466 * <p>Derived classes should not override this method. 13467 * Derived classes with children should override 13468 * onLayout. In that method, they should 13469 * call layout on each of their children.</p> 13470 * 13471 * @param l Left position, relative to parent 13472 * @param t Top position, relative to parent 13473 * @param r Right position, relative to parent 13474 * @param b Bottom position, relative to parent 13475 */ 13476 @SuppressWarnings({"unchecked"}) 13477 public void layout(int l, int t, int r, int b) { 13478 int oldL = mLeft; 13479 int oldT = mTop; 13480 int oldB = mBottom; 13481 int oldR = mRight; 13482 boolean changed = setFrame(l, t, r, b); 13483 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13484 if (ViewDebug.TRACE_HIERARCHY) { 13485 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13486 } 13487 13488 onLayout(changed, l, t, r, b); 13489 mPrivateFlags &= ~LAYOUT_REQUIRED; 13490 13491 ListenerInfo li = mListenerInfo; 13492 if (li != null && li.mOnLayoutChangeListeners != null) { 13493 ArrayList<OnLayoutChangeListener> listenersCopy = 13494 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13495 int numListeners = listenersCopy.size(); 13496 for (int i = 0; i < numListeners; ++i) { 13497 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13498 } 13499 } 13500 } 13501 mPrivateFlags &= ~FORCE_LAYOUT; 13502 } 13503 13504 /** 13505 * Called from layout when this view should 13506 * assign a size and position to each of its children. 13507 * 13508 * Derived classes with children should override 13509 * this method and call layout on each of 13510 * their children. 13511 * @param changed This is a new size or position for this view 13512 * @param left Left position, relative to parent 13513 * @param top Top position, relative to parent 13514 * @param right Right position, relative to parent 13515 * @param bottom Bottom position, relative to parent 13516 */ 13517 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13518 } 13519 13520 /** 13521 * Assign a size and position to this view. 13522 * 13523 * This is called from layout. 13524 * 13525 * @param left Left position, relative to parent 13526 * @param top Top position, relative to parent 13527 * @param right Right position, relative to parent 13528 * @param bottom Bottom position, relative to parent 13529 * @return true if the new size and position are different than the 13530 * previous ones 13531 * {@hide} 13532 */ 13533 protected boolean setFrame(int left, int top, int right, int bottom) { 13534 boolean changed = false; 13535 13536 if (DBG) { 13537 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13538 + right + "," + bottom + ")"); 13539 } 13540 13541 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13542 changed = true; 13543 13544 // Remember our drawn bit 13545 int drawn = mPrivateFlags & DRAWN; 13546 13547 int oldWidth = mRight - mLeft; 13548 int oldHeight = mBottom - mTop; 13549 int newWidth = right - left; 13550 int newHeight = bottom - top; 13551 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13552 13553 // Invalidate our old position 13554 invalidate(sizeChanged); 13555 13556 mLeft = left; 13557 mTop = top; 13558 mRight = right; 13559 mBottom = bottom; 13560 if (mDisplayList != null) { 13561 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13562 } 13563 13564 mPrivateFlags |= HAS_BOUNDS; 13565 13566 13567 if (sizeChanged) { 13568 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13569 // A change in dimension means an auto-centered pivot point changes, too 13570 if (mTransformationInfo != null) { 13571 mTransformationInfo.mMatrixDirty = true; 13572 } 13573 } 13574 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13575 } 13576 13577 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13578 // If we are visible, force the DRAWN bit to on so that 13579 // this invalidate will go through (at least to our parent). 13580 // This is because someone may have invalidated this view 13581 // before this call to setFrame came in, thereby clearing 13582 // the DRAWN bit. 13583 mPrivateFlags |= DRAWN; 13584 invalidate(sizeChanged); 13585 // parent display list may need to be recreated based on a change in the bounds 13586 // of any child 13587 invalidateParentCaches(); 13588 } 13589 13590 // Reset drawn bit to original value (invalidate turns it off) 13591 mPrivateFlags |= drawn; 13592 13593 mBackgroundSizeChanged = true; 13594 } 13595 return changed; 13596 } 13597 13598 /** 13599 * Finalize inflating a view from XML. This is called as the last phase 13600 * of inflation, after all child views have been added. 13601 * 13602 * <p>Even if the subclass overrides onFinishInflate, they should always be 13603 * sure to call the super method, so that we get called. 13604 */ 13605 protected void onFinishInflate() { 13606 } 13607 13608 /** 13609 * Returns the resources associated with this view. 13610 * 13611 * @return Resources object. 13612 */ 13613 public Resources getResources() { 13614 return mResources; 13615 } 13616 13617 /** 13618 * Invalidates the specified Drawable. 13619 * 13620 * @param drawable the drawable to invalidate 13621 */ 13622 public void invalidateDrawable(Drawable drawable) { 13623 if (verifyDrawable(drawable)) { 13624 final Rect dirty = drawable.getBounds(); 13625 final int scrollX = mScrollX; 13626 final int scrollY = mScrollY; 13627 13628 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13629 dirty.right + scrollX, dirty.bottom + scrollY); 13630 } 13631 } 13632 13633 /** 13634 * Schedules an action on a drawable to occur at a specified time. 13635 * 13636 * @param who the recipient of the action 13637 * @param what the action to run on the drawable 13638 * @param when the time at which the action must occur. Uses the 13639 * {@link SystemClock#uptimeMillis} timebase. 13640 */ 13641 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13642 if (verifyDrawable(who) && what != null) { 13643 final long delay = when - SystemClock.uptimeMillis(); 13644 if (mAttachInfo != null) { 13645 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13646 Choreographer.CALLBACK_ANIMATION, what, who, 13647 Choreographer.subtractFrameDelay(delay)); 13648 } else { 13649 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13650 } 13651 } 13652 } 13653 13654 /** 13655 * Cancels a scheduled action on a drawable. 13656 * 13657 * @param who the recipient of the action 13658 * @param what the action to cancel 13659 */ 13660 public void unscheduleDrawable(Drawable who, Runnable what) { 13661 if (verifyDrawable(who) && what != null) { 13662 if (mAttachInfo != null) { 13663 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13664 Choreographer.CALLBACK_ANIMATION, what, who); 13665 } else { 13666 ViewRootImpl.getRunQueue().removeCallbacks(what); 13667 } 13668 } 13669 } 13670 13671 /** 13672 * Unschedule any events associated with the given Drawable. This can be 13673 * used when selecting a new Drawable into a view, so that the previous 13674 * one is completely unscheduled. 13675 * 13676 * @param who The Drawable to unschedule. 13677 * 13678 * @see #drawableStateChanged 13679 */ 13680 public void unscheduleDrawable(Drawable who) { 13681 if (mAttachInfo != null && who != null) { 13682 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13683 Choreographer.CALLBACK_ANIMATION, null, who); 13684 } 13685 } 13686 13687 /** 13688 * Return the layout direction of a given Drawable. 13689 * 13690 * @param who the Drawable to query 13691 */ 13692 public int getResolvedLayoutDirection(Drawable who) { 13693 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13694 } 13695 13696 /** 13697 * If your view subclass is displaying its own Drawable objects, it should 13698 * override this function and return true for any Drawable it is 13699 * displaying. This allows animations for those drawables to be 13700 * scheduled. 13701 * 13702 * <p>Be sure to call through to the super class when overriding this 13703 * function. 13704 * 13705 * @param who The Drawable to verify. Return true if it is one you are 13706 * displaying, else return the result of calling through to the 13707 * super class. 13708 * 13709 * @return boolean If true than the Drawable is being displayed in the 13710 * view; else false and it is not allowed to animate. 13711 * 13712 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13713 * @see #drawableStateChanged() 13714 */ 13715 protected boolean verifyDrawable(Drawable who) { 13716 return who == mBackground; 13717 } 13718 13719 /** 13720 * This function is called whenever the state of the view changes in such 13721 * a way that it impacts the state of drawables being shown. 13722 * 13723 * <p>Be sure to call through to the superclass when overriding this 13724 * function. 13725 * 13726 * @see Drawable#setState(int[]) 13727 */ 13728 protected void drawableStateChanged() { 13729 Drawable d = mBackground; 13730 if (d != null && d.isStateful()) { 13731 d.setState(getDrawableState()); 13732 } 13733 } 13734 13735 /** 13736 * Call this to force a view to update its drawable state. This will cause 13737 * drawableStateChanged to be called on this view. Views that are interested 13738 * in the new state should call getDrawableState. 13739 * 13740 * @see #drawableStateChanged 13741 * @see #getDrawableState 13742 */ 13743 public void refreshDrawableState() { 13744 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13745 drawableStateChanged(); 13746 13747 ViewParent parent = mParent; 13748 if (parent != null) { 13749 parent.childDrawableStateChanged(this); 13750 } 13751 } 13752 13753 /** 13754 * Return an array of resource IDs of the drawable states representing the 13755 * current state of the view. 13756 * 13757 * @return The current drawable state 13758 * 13759 * @see Drawable#setState(int[]) 13760 * @see #drawableStateChanged() 13761 * @see #onCreateDrawableState(int) 13762 */ 13763 public final int[] getDrawableState() { 13764 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13765 return mDrawableState; 13766 } else { 13767 mDrawableState = onCreateDrawableState(0); 13768 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13769 return mDrawableState; 13770 } 13771 } 13772 13773 /** 13774 * Generate the new {@link android.graphics.drawable.Drawable} state for 13775 * this view. This is called by the view 13776 * system when the cached Drawable state is determined to be invalid. To 13777 * retrieve the current state, you should use {@link #getDrawableState}. 13778 * 13779 * @param extraSpace if non-zero, this is the number of extra entries you 13780 * would like in the returned array in which you can place your own 13781 * states. 13782 * 13783 * @return Returns an array holding the current {@link Drawable} state of 13784 * the view. 13785 * 13786 * @see #mergeDrawableStates(int[], int[]) 13787 */ 13788 protected int[] onCreateDrawableState(int extraSpace) { 13789 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13790 mParent instanceof View) { 13791 return ((View) mParent).onCreateDrawableState(extraSpace); 13792 } 13793 13794 int[] drawableState; 13795 13796 int privateFlags = mPrivateFlags; 13797 13798 int viewStateIndex = 0; 13799 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13800 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13801 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13802 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13803 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13804 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13805 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13806 HardwareRenderer.isAvailable()) { 13807 // This is set if HW acceleration is requested, even if the current 13808 // process doesn't allow it. This is just to allow app preview 13809 // windows to better match their app. 13810 viewStateIndex |= VIEW_STATE_ACCELERATED; 13811 } 13812 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13813 13814 final int privateFlags2 = mPrivateFlags2; 13815 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13816 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13817 13818 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13819 13820 //noinspection ConstantIfStatement 13821 if (false) { 13822 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13823 Log.i("View", toString() 13824 + " pressed=" + ((privateFlags & PRESSED) != 0) 13825 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13826 + " fo=" + hasFocus() 13827 + " sl=" + ((privateFlags & SELECTED) != 0) 13828 + " wf=" + hasWindowFocus() 13829 + ": " + Arrays.toString(drawableState)); 13830 } 13831 13832 if (extraSpace == 0) { 13833 return drawableState; 13834 } 13835 13836 final int[] fullState; 13837 if (drawableState != null) { 13838 fullState = new int[drawableState.length + extraSpace]; 13839 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13840 } else { 13841 fullState = new int[extraSpace]; 13842 } 13843 13844 return fullState; 13845 } 13846 13847 /** 13848 * Merge your own state values in <var>additionalState</var> into the base 13849 * state values <var>baseState</var> that were returned by 13850 * {@link #onCreateDrawableState(int)}. 13851 * 13852 * @param baseState The base state values returned by 13853 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13854 * own additional state values. 13855 * 13856 * @param additionalState The additional state values you would like 13857 * added to <var>baseState</var>; this array is not modified. 13858 * 13859 * @return As a convenience, the <var>baseState</var> array you originally 13860 * passed into the function is returned. 13861 * 13862 * @see #onCreateDrawableState(int) 13863 */ 13864 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13865 final int N = baseState.length; 13866 int i = N - 1; 13867 while (i >= 0 && baseState[i] == 0) { 13868 i--; 13869 } 13870 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13871 return baseState; 13872 } 13873 13874 /** 13875 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13876 * on all Drawable objects associated with this view. 13877 */ 13878 public void jumpDrawablesToCurrentState() { 13879 if (mBackground != null) { 13880 mBackground.jumpToCurrentState(); 13881 } 13882 } 13883 13884 /** 13885 * Sets the background color for this view. 13886 * @param color the color of the background 13887 */ 13888 @RemotableViewMethod 13889 public void setBackgroundColor(int color) { 13890 if (mBackground instanceof ColorDrawable) { 13891 ((ColorDrawable) mBackground).setColor(color); 13892 } else { 13893 setBackground(new ColorDrawable(color)); 13894 } 13895 } 13896 13897 /** 13898 * Set the background to a given resource. The resource should refer to 13899 * a Drawable object or 0 to remove the background. 13900 * @param resid The identifier of the resource. 13901 * 13902 * @attr ref android.R.styleable#View_background 13903 */ 13904 @RemotableViewMethod 13905 public void setBackgroundResource(int resid) { 13906 if (resid != 0 && resid == mBackgroundResource) { 13907 return; 13908 } 13909 13910 Drawable d= null; 13911 if (resid != 0) { 13912 d = mResources.getDrawable(resid); 13913 } 13914 setBackground(d); 13915 13916 mBackgroundResource = resid; 13917 } 13918 13919 /** 13920 * Set the background to a given Drawable, or remove the background. If the 13921 * background has padding, this View's padding is set to the background's 13922 * padding. However, when a background is removed, this View's padding isn't 13923 * touched. If setting the padding is desired, please use 13924 * {@link #setPadding(int, int, int, int)}. 13925 * 13926 * @param background The Drawable to use as the background, or null to remove the 13927 * background 13928 */ 13929 public void setBackground(Drawable background) { 13930 //noinspection deprecation 13931 setBackgroundDrawable(background); 13932 } 13933 13934 /** 13935 * @deprecated use {@link #setBackground(Drawable)} instead 13936 */ 13937 @Deprecated 13938 public void setBackgroundDrawable(Drawable background) { 13939 if (background == mBackground) { 13940 return; 13941 } 13942 13943 boolean requestLayout = false; 13944 13945 mBackgroundResource = 0; 13946 13947 /* 13948 * Regardless of whether we're setting a new background or not, we want 13949 * to clear the previous drawable. 13950 */ 13951 if (mBackground != null) { 13952 mBackground.setCallback(null); 13953 unscheduleDrawable(mBackground); 13954 } 13955 13956 if (background != null) { 13957 Rect padding = sThreadLocal.get(); 13958 if (padding == null) { 13959 padding = new Rect(); 13960 sThreadLocal.set(padding); 13961 } 13962 if (background.getPadding(padding)) { 13963 switch (background.getResolvedLayoutDirectionSelf()) { 13964 case LAYOUT_DIRECTION_RTL: 13965 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13966 break; 13967 case LAYOUT_DIRECTION_LTR: 13968 default: 13969 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13970 } 13971 } 13972 13973 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13974 // if it has a different minimum size, we should layout again 13975 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13976 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13977 requestLayout = true; 13978 } 13979 13980 background.setCallback(this); 13981 if (background.isStateful()) { 13982 background.setState(getDrawableState()); 13983 } 13984 background.setVisible(getVisibility() == VISIBLE, false); 13985 mBackground = background; 13986 13987 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13988 mPrivateFlags &= ~SKIP_DRAW; 13989 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13990 requestLayout = true; 13991 } 13992 } else { 13993 /* Remove the background */ 13994 mBackground = null; 13995 13996 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13997 /* 13998 * This view ONLY drew the background before and we're removing 13999 * the background, so now it won't draw anything 14000 * (hence we SKIP_DRAW) 14001 */ 14002 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14003 mPrivateFlags |= SKIP_DRAW; 14004 } 14005 14006 /* 14007 * When the background is set, we try to apply its padding to this 14008 * View. When the background is removed, we don't touch this View's 14009 * padding. This is noted in the Javadocs. Hence, we don't need to 14010 * requestLayout(), the invalidate() below is sufficient. 14011 */ 14012 14013 // The old background's minimum size could have affected this 14014 // View's layout, so let's requestLayout 14015 requestLayout = true; 14016 } 14017 14018 computeOpaqueFlags(); 14019 14020 if (requestLayout) { 14021 requestLayout(); 14022 } 14023 14024 mBackgroundSizeChanged = true; 14025 invalidate(true); 14026 } 14027 14028 /** 14029 * Gets the background drawable 14030 * 14031 * @return The drawable used as the background for this view, if any. 14032 * 14033 * @see #setBackground(Drawable) 14034 * 14035 * @attr ref android.R.styleable#View_background 14036 */ 14037 public Drawable getBackground() { 14038 return mBackground; 14039 } 14040 14041 /** 14042 * Sets the padding. The view may add on the space required to display 14043 * the scrollbars, depending on the style and visibility of the scrollbars. 14044 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14045 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14046 * from the values set in this call. 14047 * 14048 * @attr ref android.R.styleable#View_padding 14049 * @attr ref android.R.styleable#View_paddingBottom 14050 * @attr ref android.R.styleable#View_paddingLeft 14051 * @attr ref android.R.styleable#View_paddingRight 14052 * @attr ref android.R.styleable#View_paddingTop 14053 * @param left the left padding in pixels 14054 * @param top the top padding in pixels 14055 * @param right the right padding in pixels 14056 * @param bottom the bottom padding in pixels 14057 */ 14058 public void setPadding(int left, int top, int right, int bottom) { 14059 mUserPaddingStart = -1; 14060 mUserPaddingEnd = -1; 14061 mUserPaddingRelative = false; 14062 14063 internalSetPadding(left, top, right, bottom); 14064 } 14065 14066 private void internalSetPadding(int left, int top, int right, int bottom) { 14067 mUserPaddingLeft = left; 14068 mUserPaddingRight = right; 14069 mUserPaddingBottom = bottom; 14070 14071 final int viewFlags = mViewFlags; 14072 boolean changed = false; 14073 14074 // Common case is there are no scroll bars. 14075 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14076 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14077 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14078 ? 0 : getVerticalScrollbarWidth(); 14079 switch (mVerticalScrollbarPosition) { 14080 case SCROLLBAR_POSITION_DEFAULT: 14081 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14082 left += offset; 14083 } else { 14084 right += offset; 14085 } 14086 break; 14087 case SCROLLBAR_POSITION_RIGHT: 14088 right += offset; 14089 break; 14090 case SCROLLBAR_POSITION_LEFT: 14091 left += offset; 14092 break; 14093 } 14094 } 14095 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14096 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14097 ? 0 : getHorizontalScrollbarHeight(); 14098 } 14099 } 14100 14101 if (mPaddingLeft != left) { 14102 changed = true; 14103 mPaddingLeft = left; 14104 } 14105 if (mPaddingTop != top) { 14106 changed = true; 14107 mPaddingTop = top; 14108 } 14109 if (mPaddingRight != right) { 14110 changed = true; 14111 mPaddingRight = right; 14112 } 14113 if (mPaddingBottom != bottom) { 14114 changed = true; 14115 mPaddingBottom = bottom; 14116 } 14117 14118 if (changed) { 14119 requestLayout(); 14120 } 14121 } 14122 14123 /** 14124 * Sets the relative padding. The view may add on the space required to display 14125 * the scrollbars, depending on the style and visibility of the scrollbars. 14126 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14127 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14128 * from the values set in this call. 14129 * 14130 * @attr ref android.R.styleable#View_padding 14131 * @attr ref android.R.styleable#View_paddingBottom 14132 * @attr ref android.R.styleable#View_paddingStart 14133 * @attr ref android.R.styleable#View_paddingEnd 14134 * @attr ref android.R.styleable#View_paddingTop 14135 * @param start the start padding in pixels 14136 * @param top the top padding in pixels 14137 * @param end the end padding in pixels 14138 * @param bottom the bottom padding in pixels 14139 */ 14140 public void setPaddingRelative(int start, int top, int end, int bottom) { 14141 mUserPaddingStart = start; 14142 mUserPaddingEnd = end; 14143 mUserPaddingRelative = true; 14144 14145 switch(getResolvedLayoutDirection()) { 14146 case LAYOUT_DIRECTION_RTL: 14147 internalSetPadding(end, top, start, bottom); 14148 break; 14149 case LAYOUT_DIRECTION_LTR: 14150 default: 14151 internalSetPadding(start, top, end, bottom); 14152 } 14153 } 14154 14155 /** 14156 * Returns the top padding of this view. 14157 * 14158 * @return the top padding in pixels 14159 */ 14160 public int getPaddingTop() { 14161 return mPaddingTop; 14162 } 14163 14164 /** 14165 * Returns the bottom padding of this view. If there are inset and enabled 14166 * scrollbars, this value may include the space required to display the 14167 * scrollbars as well. 14168 * 14169 * @return the bottom padding in pixels 14170 */ 14171 public int getPaddingBottom() { 14172 return mPaddingBottom; 14173 } 14174 14175 /** 14176 * Returns the left padding of this view. If there are inset and enabled 14177 * scrollbars, this value may include the space required to display the 14178 * scrollbars as well. 14179 * 14180 * @return the left padding in pixels 14181 */ 14182 public int getPaddingLeft() { 14183 return mPaddingLeft; 14184 } 14185 14186 /** 14187 * Returns the start padding of this view depending on its resolved layout direction. 14188 * If there are inset and enabled scrollbars, this value may include the space 14189 * required to display the scrollbars as well. 14190 * 14191 * @return the start padding in pixels 14192 */ 14193 public int getPaddingStart() { 14194 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14195 mPaddingRight : mPaddingLeft; 14196 } 14197 14198 /** 14199 * Returns the right padding of this view. If there are inset and enabled 14200 * scrollbars, this value may include the space required to display the 14201 * scrollbars as well. 14202 * 14203 * @return the right padding in pixels 14204 */ 14205 public int getPaddingRight() { 14206 return mPaddingRight; 14207 } 14208 14209 /** 14210 * Returns the end padding of this view depending on its resolved layout direction. 14211 * If there are inset and enabled scrollbars, this value may include the space 14212 * required to display the scrollbars as well. 14213 * 14214 * @return the end padding in pixels 14215 */ 14216 public int getPaddingEnd() { 14217 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14218 mPaddingLeft : mPaddingRight; 14219 } 14220 14221 /** 14222 * Return if the padding as been set thru relative values 14223 * {@link #setPaddingRelative(int, int, int, int)} or thru 14224 * @attr ref android.R.styleable#View_paddingStart or 14225 * @attr ref android.R.styleable#View_paddingEnd 14226 * 14227 * @return true if the padding is relative or false if it is not. 14228 */ 14229 public boolean isPaddingRelative() { 14230 return mUserPaddingRelative; 14231 } 14232 14233 /** 14234 * @hide 14235 */ 14236 public Insets getOpticalInsets() { 14237 if (mLayoutInsets == null) { 14238 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14239 } 14240 return mLayoutInsets; 14241 } 14242 14243 /** 14244 * @hide 14245 */ 14246 public void setLayoutInsets(Insets layoutInsets) { 14247 mLayoutInsets = layoutInsets; 14248 } 14249 14250 /** 14251 * Changes the selection state of this view. A view can be selected or not. 14252 * Note that selection is not the same as focus. Views are typically 14253 * selected in the context of an AdapterView like ListView or GridView; 14254 * the selected view is the view that is highlighted. 14255 * 14256 * @param selected true if the view must be selected, false otherwise 14257 */ 14258 public void setSelected(boolean selected) { 14259 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14260 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14261 if (!selected) resetPressedState(); 14262 invalidate(true); 14263 refreshDrawableState(); 14264 dispatchSetSelected(selected); 14265 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14266 notifyAccessibilityStateChanged(); 14267 } 14268 } 14269 } 14270 14271 /** 14272 * Dispatch setSelected to all of this View's children. 14273 * 14274 * @see #setSelected(boolean) 14275 * 14276 * @param selected The new selected state 14277 */ 14278 protected void dispatchSetSelected(boolean selected) { 14279 } 14280 14281 /** 14282 * Indicates the selection state of this view. 14283 * 14284 * @return true if the view is selected, false otherwise 14285 */ 14286 @ViewDebug.ExportedProperty 14287 public boolean isSelected() { 14288 return (mPrivateFlags & SELECTED) != 0; 14289 } 14290 14291 /** 14292 * Changes the activated state of this view. A view can be activated or not. 14293 * Note that activation is not the same as selection. Selection is 14294 * a transient property, representing the view (hierarchy) the user is 14295 * currently interacting with. Activation is a longer-term state that the 14296 * user can move views in and out of. For example, in a list view with 14297 * single or multiple selection enabled, the views in the current selection 14298 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14299 * here.) The activated state is propagated down to children of the view it 14300 * is set on. 14301 * 14302 * @param activated true if the view must be activated, false otherwise 14303 */ 14304 public void setActivated(boolean activated) { 14305 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14306 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14307 invalidate(true); 14308 refreshDrawableState(); 14309 dispatchSetActivated(activated); 14310 } 14311 } 14312 14313 /** 14314 * Dispatch setActivated to all of this View's children. 14315 * 14316 * @see #setActivated(boolean) 14317 * 14318 * @param activated The new activated state 14319 */ 14320 protected void dispatchSetActivated(boolean activated) { 14321 } 14322 14323 /** 14324 * Indicates the activation state of this view. 14325 * 14326 * @return true if the view is activated, false otherwise 14327 */ 14328 @ViewDebug.ExportedProperty 14329 public boolean isActivated() { 14330 return (mPrivateFlags & ACTIVATED) != 0; 14331 } 14332 14333 /** 14334 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14335 * observer can be used to get notifications when global events, like 14336 * layout, happen. 14337 * 14338 * The returned ViewTreeObserver observer is not guaranteed to remain 14339 * valid for the lifetime of this View. If the caller of this method keeps 14340 * a long-lived reference to ViewTreeObserver, it should always check for 14341 * the return value of {@link ViewTreeObserver#isAlive()}. 14342 * 14343 * @return The ViewTreeObserver for this view's hierarchy. 14344 */ 14345 public ViewTreeObserver getViewTreeObserver() { 14346 if (mAttachInfo != null) { 14347 return mAttachInfo.mTreeObserver; 14348 } 14349 if (mFloatingTreeObserver == null) { 14350 mFloatingTreeObserver = new ViewTreeObserver(); 14351 } 14352 return mFloatingTreeObserver; 14353 } 14354 14355 /** 14356 * <p>Finds the topmost view in the current view hierarchy.</p> 14357 * 14358 * @return the topmost view containing this view 14359 */ 14360 public View getRootView() { 14361 if (mAttachInfo != null) { 14362 final View v = mAttachInfo.mRootView; 14363 if (v != null) { 14364 return v; 14365 } 14366 } 14367 14368 View parent = this; 14369 14370 while (parent.mParent != null && parent.mParent instanceof View) { 14371 parent = (View) parent.mParent; 14372 } 14373 14374 return parent; 14375 } 14376 14377 /** 14378 * <p>Computes the coordinates of this view on the screen. The argument 14379 * must be an array of two integers. After the method returns, the array 14380 * contains the x and y location in that order.</p> 14381 * 14382 * @param location an array of two integers in which to hold the coordinates 14383 */ 14384 public void getLocationOnScreen(int[] location) { 14385 getLocationInWindow(location); 14386 14387 final AttachInfo info = mAttachInfo; 14388 if (info != null) { 14389 location[0] += info.mWindowLeft; 14390 location[1] += info.mWindowTop; 14391 } 14392 } 14393 14394 /** 14395 * <p>Computes the coordinates of this view in its window. The argument 14396 * must be an array of two integers. After the method returns, the array 14397 * contains the x and y location in that order.</p> 14398 * 14399 * @param location an array of two integers in which to hold the coordinates 14400 */ 14401 public void getLocationInWindow(int[] location) { 14402 if (location == null || location.length < 2) { 14403 throw new IllegalArgumentException("location must be an array of two integers"); 14404 } 14405 14406 if (mAttachInfo == null) { 14407 // When the view is not attached to a window, this method does not make sense 14408 location[0] = location[1] = 0; 14409 return; 14410 } 14411 14412 float[] position = mAttachInfo.mTmpTransformLocation; 14413 position[0] = position[1] = 0.0f; 14414 14415 if (!hasIdentityMatrix()) { 14416 getMatrix().mapPoints(position); 14417 } 14418 14419 position[0] += mLeft; 14420 position[1] += mTop; 14421 14422 ViewParent viewParent = mParent; 14423 while (viewParent instanceof View) { 14424 final View view = (View) viewParent; 14425 14426 position[0] -= view.mScrollX; 14427 position[1] -= view.mScrollY; 14428 14429 if (!view.hasIdentityMatrix()) { 14430 view.getMatrix().mapPoints(position); 14431 } 14432 14433 position[0] += view.mLeft; 14434 position[1] += view.mTop; 14435 14436 viewParent = view.mParent; 14437 } 14438 14439 if (viewParent instanceof ViewRootImpl) { 14440 // *cough* 14441 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14442 position[1] -= vr.mCurScrollY; 14443 } 14444 14445 location[0] = (int) (position[0] + 0.5f); 14446 location[1] = (int) (position[1] + 0.5f); 14447 } 14448 14449 /** 14450 * {@hide} 14451 * @param id the id of the view to be found 14452 * @return the view of the specified id, null if cannot be found 14453 */ 14454 protected View findViewTraversal(int id) { 14455 if (id == mID) { 14456 return this; 14457 } 14458 return null; 14459 } 14460 14461 /** 14462 * {@hide} 14463 * @param tag the tag of the view to be found 14464 * @return the view of specified tag, null if cannot be found 14465 */ 14466 protected View findViewWithTagTraversal(Object tag) { 14467 if (tag != null && tag.equals(mTag)) { 14468 return this; 14469 } 14470 return null; 14471 } 14472 14473 /** 14474 * {@hide} 14475 * @param predicate The predicate to evaluate. 14476 * @param childToSkip If not null, ignores this child during the recursive traversal. 14477 * @return The first view that matches the predicate or null. 14478 */ 14479 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14480 if (predicate.apply(this)) { 14481 return this; 14482 } 14483 return null; 14484 } 14485 14486 /** 14487 * Look for a child view with the given id. If this view has the given 14488 * id, return this view. 14489 * 14490 * @param id The id to search for. 14491 * @return The view that has the given id in the hierarchy or null 14492 */ 14493 public final View findViewById(int id) { 14494 if (id < 0) { 14495 return null; 14496 } 14497 return findViewTraversal(id); 14498 } 14499 14500 /** 14501 * Finds a view by its unuque and stable accessibility id. 14502 * 14503 * @param accessibilityId The searched accessibility id. 14504 * @return The found view. 14505 */ 14506 final View findViewByAccessibilityId(int accessibilityId) { 14507 if (accessibilityId < 0) { 14508 return null; 14509 } 14510 return findViewByAccessibilityIdTraversal(accessibilityId); 14511 } 14512 14513 /** 14514 * Performs the traversal to find a view by its unuque and stable accessibility id. 14515 * 14516 * <strong>Note:</strong>This method does not stop at the root namespace 14517 * boundary since the user can touch the screen at an arbitrary location 14518 * potentially crossing the root namespace bounday which will send an 14519 * accessibility event to accessibility services and they should be able 14520 * to obtain the event source. Also accessibility ids are guaranteed to be 14521 * unique in the window. 14522 * 14523 * @param accessibilityId The accessibility id. 14524 * @return The found view. 14525 */ 14526 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14527 if (getAccessibilityViewId() == accessibilityId) { 14528 return this; 14529 } 14530 return null; 14531 } 14532 14533 /** 14534 * Look for a child view with the given tag. If this view has the given 14535 * tag, return this view. 14536 * 14537 * @param tag The tag to search for, using "tag.equals(getTag())". 14538 * @return The View that has the given tag in the hierarchy or null 14539 */ 14540 public final View findViewWithTag(Object tag) { 14541 if (tag == null) { 14542 return null; 14543 } 14544 return findViewWithTagTraversal(tag); 14545 } 14546 14547 /** 14548 * {@hide} 14549 * Look for a child view that matches the specified predicate. 14550 * If this view matches the predicate, return this view. 14551 * 14552 * @param predicate The predicate to evaluate. 14553 * @return The first view that matches the predicate or null. 14554 */ 14555 public final View findViewByPredicate(Predicate<View> predicate) { 14556 return findViewByPredicateTraversal(predicate, null); 14557 } 14558 14559 /** 14560 * {@hide} 14561 * Look for a child view that matches the specified predicate, 14562 * starting with the specified view and its descendents and then 14563 * recusively searching the ancestors and siblings of that view 14564 * until this view is reached. 14565 * 14566 * This method is useful in cases where the predicate does not match 14567 * a single unique view (perhaps multiple views use the same id) 14568 * and we are trying to find the view that is "closest" in scope to the 14569 * starting view. 14570 * 14571 * @param start The view to start from. 14572 * @param predicate The predicate to evaluate. 14573 * @return The first view that matches the predicate or null. 14574 */ 14575 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14576 View childToSkip = null; 14577 for (;;) { 14578 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14579 if (view != null || start == this) { 14580 return view; 14581 } 14582 14583 ViewParent parent = start.getParent(); 14584 if (parent == null || !(parent instanceof View)) { 14585 return null; 14586 } 14587 14588 childToSkip = start; 14589 start = (View) parent; 14590 } 14591 } 14592 14593 /** 14594 * Sets the identifier for this view. The identifier does not have to be 14595 * unique in this view's hierarchy. The identifier should be a positive 14596 * number. 14597 * 14598 * @see #NO_ID 14599 * @see #getId() 14600 * @see #findViewById(int) 14601 * 14602 * @param id a number used to identify the view 14603 * 14604 * @attr ref android.R.styleable#View_id 14605 */ 14606 public void setId(int id) { 14607 mID = id; 14608 } 14609 14610 /** 14611 * {@hide} 14612 * 14613 * @param isRoot true if the view belongs to the root namespace, false 14614 * otherwise 14615 */ 14616 public void setIsRootNamespace(boolean isRoot) { 14617 if (isRoot) { 14618 mPrivateFlags |= IS_ROOT_NAMESPACE; 14619 } else { 14620 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14621 } 14622 } 14623 14624 /** 14625 * {@hide} 14626 * 14627 * @return true if the view belongs to the root namespace, false otherwise 14628 */ 14629 public boolean isRootNamespace() { 14630 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14631 } 14632 14633 /** 14634 * Returns this view's identifier. 14635 * 14636 * @return a positive integer used to identify the view or {@link #NO_ID} 14637 * if the view has no ID 14638 * 14639 * @see #setId(int) 14640 * @see #findViewById(int) 14641 * @attr ref android.R.styleable#View_id 14642 */ 14643 @ViewDebug.CapturedViewProperty 14644 public int getId() { 14645 return mID; 14646 } 14647 14648 /** 14649 * Returns this view's tag. 14650 * 14651 * @return the Object stored in this view as a tag 14652 * 14653 * @see #setTag(Object) 14654 * @see #getTag(int) 14655 */ 14656 @ViewDebug.ExportedProperty 14657 public Object getTag() { 14658 return mTag; 14659 } 14660 14661 /** 14662 * Sets the tag associated with this view. A tag can be used to mark 14663 * a view in its hierarchy and does not have to be unique within the 14664 * hierarchy. Tags can also be used to store data within a view without 14665 * resorting to another data structure. 14666 * 14667 * @param tag an Object to tag the view with 14668 * 14669 * @see #getTag() 14670 * @see #setTag(int, Object) 14671 */ 14672 public void setTag(final Object tag) { 14673 mTag = tag; 14674 } 14675 14676 /** 14677 * Returns the tag associated with this view and the specified key. 14678 * 14679 * @param key The key identifying the tag 14680 * 14681 * @return the Object stored in this view as a tag 14682 * 14683 * @see #setTag(int, Object) 14684 * @see #getTag() 14685 */ 14686 public Object getTag(int key) { 14687 if (mKeyedTags != null) return mKeyedTags.get(key); 14688 return null; 14689 } 14690 14691 /** 14692 * Sets a tag associated with this view and a key. A tag can be used 14693 * to mark a view in its hierarchy and does not have to be unique within 14694 * the hierarchy. Tags can also be used to store data within a view 14695 * without resorting to another data structure. 14696 * 14697 * The specified key should be an id declared in the resources of the 14698 * application to ensure it is unique (see the <a 14699 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14700 * Keys identified as belonging to 14701 * the Android framework or not associated with any package will cause 14702 * an {@link IllegalArgumentException} to be thrown. 14703 * 14704 * @param key The key identifying the tag 14705 * @param tag An Object to tag the view with 14706 * 14707 * @throws IllegalArgumentException If they specified key is not valid 14708 * 14709 * @see #setTag(Object) 14710 * @see #getTag(int) 14711 */ 14712 public void setTag(int key, final Object tag) { 14713 // If the package id is 0x00 or 0x01, it's either an undefined package 14714 // or a framework id 14715 if ((key >>> 24) < 2) { 14716 throw new IllegalArgumentException("The key must be an application-specific " 14717 + "resource id."); 14718 } 14719 14720 setKeyedTag(key, tag); 14721 } 14722 14723 /** 14724 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14725 * framework id. 14726 * 14727 * @hide 14728 */ 14729 public void setTagInternal(int key, Object tag) { 14730 if ((key >>> 24) != 0x1) { 14731 throw new IllegalArgumentException("The key must be a framework-specific " 14732 + "resource id."); 14733 } 14734 14735 setKeyedTag(key, tag); 14736 } 14737 14738 private void setKeyedTag(int key, Object tag) { 14739 if (mKeyedTags == null) { 14740 mKeyedTags = new SparseArray<Object>(); 14741 } 14742 14743 mKeyedTags.put(key, tag); 14744 } 14745 14746 /** 14747 * @param consistency The type of consistency. See ViewDebug for more information. 14748 * 14749 * @hide 14750 */ 14751 protected boolean dispatchConsistencyCheck(int consistency) { 14752 return onConsistencyCheck(consistency); 14753 } 14754 14755 /** 14756 * Method that subclasses should implement to check their consistency. The type of 14757 * consistency check is indicated by the bit field passed as a parameter. 14758 * 14759 * @param consistency The type of consistency. See ViewDebug for more information. 14760 * 14761 * @throws IllegalStateException if the view is in an inconsistent state. 14762 * 14763 * @hide 14764 */ 14765 protected boolean onConsistencyCheck(int consistency) { 14766 boolean result = true; 14767 14768 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14769 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14770 14771 if (checkLayout) { 14772 if (getParent() == null) { 14773 result = false; 14774 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14775 "View " + this + " does not have a parent."); 14776 } 14777 14778 if (mAttachInfo == null) { 14779 result = false; 14780 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14781 "View " + this + " is not attached to a window."); 14782 } 14783 } 14784 14785 if (checkDrawing) { 14786 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14787 // from their draw() method 14788 14789 if ((mPrivateFlags & DRAWN) != DRAWN && 14790 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14791 result = false; 14792 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14793 "View " + this + " was invalidated but its drawing cache is valid."); 14794 } 14795 } 14796 14797 return result; 14798 } 14799 14800 /** 14801 * Prints information about this view in the log output, with the tag 14802 * {@link #VIEW_LOG_TAG}. 14803 * 14804 * @hide 14805 */ 14806 public void debug() { 14807 debug(0); 14808 } 14809 14810 /** 14811 * Prints information about this view in the log output, with the tag 14812 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14813 * indentation defined by the <code>depth</code>. 14814 * 14815 * @param depth the indentation level 14816 * 14817 * @hide 14818 */ 14819 protected void debug(int depth) { 14820 String output = debugIndent(depth - 1); 14821 14822 output += "+ " + this; 14823 int id = getId(); 14824 if (id != -1) { 14825 output += " (id=" + id + ")"; 14826 } 14827 Object tag = getTag(); 14828 if (tag != null) { 14829 output += " (tag=" + tag + ")"; 14830 } 14831 Log.d(VIEW_LOG_TAG, output); 14832 14833 if ((mPrivateFlags & FOCUSED) != 0) { 14834 output = debugIndent(depth) + " FOCUSED"; 14835 Log.d(VIEW_LOG_TAG, output); 14836 } 14837 14838 output = debugIndent(depth); 14839 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14840 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14841 + "} "; 14842 Log.d(VIEW_LOG_TAG, output); 14843 14844 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14845 || mPaddingBottom != 0) { 14846 output = debugIndent(depth); 14847 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14848 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14849 Log.d(VIEW_LOG_TAG, output); 14850 } 14851 14852 output = debugIndent(depth); 14853 output += "mMeasureWidth=" + mMeasuredWidth + 14854 " mMeasureHeight=" + mMeasuredHeight; 14855 Log.d(VIEW_LOG_TAG, output); 14856 14857 output = debugIndent(depth); 14858 if (mLayoutParams == null) { 14859 output += "BAD! no layout params"; 14860 } else { 14861 output = mLayoutParams.debug(output); 14862 } 14863 Log.d(VIEW_LOG_TAG, output); 14864 14865 output = debugIndent(depth); 14866 output += "flags={"; 14867 output += View.printFlags(mViewFlags); 14868 output += "}"; 14869 Log.d(VIEW_LOG_TAG, output); 14870 14871 output = debugIndent(depth); 14872 output += "privateFlags={"; 14873 output += View.printPrivateFlags(mPrivateFlags); 14874 output += "}"; 14875 Log.d(VIEW_LOG_TAG, output); 14876 } 14877 14878 /** 14879 * Creates a string of whitespaces used for indentation. 14880 * 14881 * @param depth the indentation level 14882 * @return a String containing (depth * 2 + 3) * 2 white spaces 14883 * 14884 * @hide 14885 */ 14886 protected static String debugIndent(int depth) { 14887 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14888 for (int i = 0; i < (depth * 2) + 3; i++) { 14889 spaces.append(' ').append(' '); 14890 } 14891 return spaces.toString(); 14892 } 14893 14894 /** 14895 * <p>Return the offset of the widget's text baseline from the widget's top 14896 * boundary. If this widget does not support baseline alignment, this 14897 * method returns -1. </p> 14898 * 14899 * @return the offset of the baseline within the widget's bounds or -1 14900 * if baseline alignment is not supported 14901 */ 14902 @ViewDebug.ExportedProperty(category = "layout") 14903 public int getBaseline() { 14904 return -1; 14905 } 14906 14907 /** 14908 * Call this when something has changed which has invalidated the 14909 * layout of this view. This will schedule a layout pass of the view 14910 * tree. 14911 */ 14912 public void requestLayout() { 14913 if (ViewDebug.TRACE_HIERARCHY) { 14914 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14915 } 14916 14917 mPrivateFlags |= FORCE_LAYOUT; 14918 mPrivateFlags |= INVALIDATED; 14919 14920 if (mLayoutParams != null) { 14921 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14922 } 14923 14924 if (mParent != null && !mParent.isLayoutRequested()) { 14925 mParent.requestLayout(); 14926 } 14927 } 14928 14929 /** 14930 * Forces this view to be laid out during the next layout pass. 14931 * This method does not call requestLayout() or forceLayout() 14932 * on the parent. 14933 */ 14934 public void forceLayout() { 14935 mPrivateFlags |= FORCE_LAYOUT; 14936 mPrivateFlags |= INVALIDATED; 14937 } 14938 14939 /** 14940 * <p> 14941 * This is called to find out how big a view should be. The parent 14942 * supplies constraint information in the width and height parameters. 14943 * </p> 14944 * 14945 * <p> 14946 * The actual measurement work of a view is performed in 14947 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14948 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14949 * </p> 14950 * 14951 * 14952 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14953 * parent 14954 * @param heightMeasureSpec Vertical space requirements as imposed by the 14955 * parent 14956 * 14957 * @see #onMeasure(int, int) 14958 */ 14959 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14960 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14961 widthMeasureSpec != mOldWidthMeasureSpec || 14962 heightMeasureSpec != mOldHeightMeasureSpec) { 14963 14964 // first clears the measured dimension flag 14965 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14966 14967 if (ViewDebug.TRACE_HIERARCHY) { 14968 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14969 } 14970 14971 // measure ourselves, this should set the measured dimension flag back 14972 onMeasure(widthMeasureSpec, heightMeasureSpec); 14973 14974 // flag not set, setMeasuredDimension() was not invoked, we raise 14975 // an exception to warn the developer 14976 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14977 throw new IllegalStateException("onMeasure() did not set the" 14978 + " measured dimension by calling" 14979 + " setMeasuredDimension()"); 14980 } 14981 14982 mPrivateFlags |= LAYOUT_REQUIRED; 14983 } 14984 14985 mOldWidthMeasureSpec = widthMeasureSpec; 14986 mOldHeightMeasureSpec = heightMeasureSpec; 14987 } 14988 14989 /** 14990 * <p> 14991 * Measure the view and its content to determine the measured width and the 14992 * measured height. This method is invoked by {@link #measure(int, int)} and 14993 * should be overriden by subclasses to provide accurate and efficient 14994 * measurement of their contents. 14995 * </p> 14996 * 14997 * <p> 14998 * <strong>CONTRACT:</strong> When overriding this method, you 14999 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15000 * measured width and height of this view. Failure to do so will trigger an 15001 * <code>IllegalStateException</code>, thrown by 15002 * {@link #measure(int, int)}. Calling the superclass' 15003 * {@link #onMeasure(int, int)} is a valid use. 15004 * </p> 15005 * 15006 * <p> 15007 * The base class implementation of measure defaults to the background size, 15008 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15009 * override {@link #onMeasure(int, int)} to provide better measurements of 15010 * their content. 15011 * </p> 15012 * 15013 * <p> 15014 * If this method is overridden, it is the subclass's responsibility to make 15015 * sure the measured height and width are at least the view's minimum height 15016 * and width ({@link #getSuggestedMinimumHeight()} and 15017 * {@link #getSuggestedMinimumWidth()}). 15018 * </p> 15019 * 15020 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15021 * The requirements are encoded with 15022 * {@link android.view.View.MeasureSpec}. 15023 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15024 * The requirements are encoded with 15025 * {@link android.view.View.MeasureSpec}. 15026 * 15027 * @see #getMeasuredWidth() 15028 * @see #getMeasuredHeight() 15029 * @see #setMeasuredDimension(int, int) 15030 * @see #getSuggestedMinimumHeight() 15031 * @see #getSuggestedMinimumWidth() 15032 * @see android.view.View.MeasureSpec#getMode(int) 15033 * @see android.view.View.MeasureSpec#getSize(int) 15034 */ 15035 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15036 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15037 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15038 } 15039 15040 /** 15041 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15042 * measured width and measured height. Failing to do so will trigger an 15043 * exception at measurement time.</p> 15044 * 15045 * @param measuredWidth The measured width of this view. May be a complex 15046 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15047 * {@link #MEASURED_STATE_TOO_SMALL}. 15048 * @param measuredHeight The measured height of this view. May be a complex 15049 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15050 * {@link #MEASURED_STATE_TOO_SMALL}. 15051 */ 15052 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15053 mMeasuredWidth = measuredWidth; 15054 mMeasuredHeight = measuredHeight; 15055 15056 mPrivateFlags |= MEASURED_DIMENSION_SET; 15057 } 15058 15059 /** 15060 * Merge two states as returned by {@link #getMeasuredState()}. 15061 * @param curState The current state as returned from a view or the result 15062 * of combining multiple views. 15063 * @param newState The new view state to combine. 15064 * @return Returns a new integer reflecting the combination of the two 15065 * states. 15066 */ 15067 public static int combineMeasuredStates(int curState, int newState) { 15068 return curState | newState; 15069 } 15070 15071 /** 15072 * Version of {@link #resolveSizeAndState(int, int, int)} 15073 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15074 */ 15075 public static int resolveSize(int size, int measureSpec) { 15076 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15077 } 15078 15079 /** 15080 * Utility to reconcile a desired size and state, with constraints imposed 15081 * by a MeasureSpec. Will take the desired size, unless a different size 15082 * is imposed by the constraints. The returned value is a compound integer, 15083 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15084 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15085 * size is smaller than the size the view wants to be. 15086 * 15087 * @param size How big the view wants to be 15088 * @param measureSpec Constraints imposed by the parent 15089 * @return Size information bit mask as defined by 15090 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15091 */ 15092 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15093 int result = size; 15094 int specMode = MeasureSpec.getMode(measureSpec); 15095 int specSize = MeasureSpec.getSize(measureSpec); 15096 switch (specMode) { 15097 case MeasureSpec.UNSPECIFIED: 15098 result = size; 15099 break; 15100 case MeasureSpec.AT_MOST: 15101 if (specSize < size) { 15102 result = specSize | MEASURED_STATE_TOO_SMALL; 15103 } else { 15104 result = size; 15105 } 15106 break; 15107 case MeasureSpec.EXACTLY: 15108 result = specSize; 15109 break; 15110 } 15111 return result | (childMeasuredState&MEASURED_STATE_MASK); 15112 } 15113 15114 /** 15115 * Utility to return a default size. Uses the supplied size if the 15116 * MeasureSpec imposed no constraints. Will get larger if allowed 15117 * by the MeasureSpec. 15118 * 15119 * @param size Default size for this view 15120 * @param measureSpec Constraints imposed by the parent 15121 * @return The size this view should be. 15122 */ 15123 public static int getDefaultSize(int size, int measureSpec) { 15124 int result = size; 15125 int specMode = MeasureSpec.getMode(measureSpec); 15126 int specSize = MeasureSpec.getSize(measureSpec); 15127 15128 switch (specMode) { 15129 case MeasureSpec.UNSPECIFIED: 15130 result = size; 15131 break; 15132 case MeasureSpec.AT_MOST: 15133 case MeasureSpec.EXACTLY: 15134 result = specSize; 15135 break; 15136 } 15137 return result; 15138 } 15139 15140 /** 15141 * Returns the suggested minimum height that the view should use. This 15142 * returns the maximum of the view's minimum height 15143 * and the background's minimum height 15144 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15145 * <p> 15146 * When being used in {@link #onMeasure(int, int)}, the caller should still 15147 * ensure the returned height is within the requirements of the parent. 15148 * 15149 * @return The suggested minimum height of the view. 15150 */ 15151 protected int getSuggestedMinimumHeight() { 15152 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15153 15154 } 15155 15156 /** 15157 * Returns the suggested minimum width that the view should use. This 15158 * returns the maximum of the view's minimum width) 15159 * and the background's minimum width 15160 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15161 * <p> 15162 * When being used in {@link #onMeasure(int, int)}, the caller should still 15163 * ensure the returned width is within the requirements of the parent. 15164 * 15165 * @return The suggested minimum width of the view. 15166 */ 15167 protected int getSuggestedMinimumWidth() { 15168 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15169 } 15170 15171 /** 15172 * Returns the minimum height of the view. 15173 * 15174 * @return the minimum height the view will try to be. 15175 * 15176 * @see #setMinimumHeight(int) 15177 * 15178 * @attr ref android.R.styleable#View_minHeight 15179 */ 15180 public int getMinimumHeight() { 15181 return mMinHeight; 15182 } 15183 15184 /** 15185 * Sets the minimum height of the view. It is not guaranteed the view will 15186 * be able to achieve this minimum height (for example, if its parent layout 15187 * constrains it with less available height). 15188 * 15189 * @param minHeight The minimum height the view will try to be. 15190 * 15191 * @see #getMinimumHeight() 15192 * 15193 * @attr ref android.R.styleable#View_minHeight 15194 */ 15195 public void setMinimumHeight(int minHeight) { 15196 mMinHeight = minHeight; 15197 requestLayout(); 15198 } 15199 15200 /** 15201 * Returns the minimum width of the view. 15202 * 15203 * @return the minimum width the view will try to be. 15204 * 15205 * @see #setMinimumWidth(int) 15206 * 15207 * @attr ref android.R.styleable#View_minWidth 15208 */ 15209 public int getMinimumWidth() { 15210 return mMinWidth; 15211 } 15212 15213 /** 15214 * Sets the minimum width of the view. It is not guaranteed the view will 15215 * be able to achieve this minimum width (for example, if its parent layout 15216 * constrains it with less available width). 15217 * 15218 * @param minWidth The minimum width the view will try to be. 15219 * 15220 * @see #getMinimumWidth() 15221 * 15222 * @attr ref android.R.styleable#View_minWidth 15223 */ 15224 public void setMinimumWidth(int minWidth) { 15225 mMinWidth = minWidth; 15226 requestLayout(); 15227 15228 } 15229 15230 /** 15231 * Get the animation currently associated with this view. 15232 * 15233 * @return The animation that is currently playing or 15234 * scheduled to play for this view. 15235 */ 15236 public Animation getAnimation() { 15237 return mCurrentAnimation; 15238 } 15239 15240 /** 15241 * Start the specified animation now. 15242 * 15243 * @param animation the animation to start now 15244 */ 15245 public void startAnimation(Animation animation) { 15246 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15247 setAnimation(animation); 15248 invalidateParentCaches(); 15249 invalidate(true); 15250 } 15251 15252 /** 15253 * Cancels any animations for this view. 15254 */ 15255 public void clearAnimation() { 15256 if (mCurrentAnimation != null) { 15257 mCurrentAnimation.detach(); 15258 } 15259 mCurrentAnimation = null; 15260 invalidateParentIfNeeded(); 15261 } 15262 15263 /** 15264 * Sets the next animation to play for this view. 15265 * If you want the animation to play immediately, use 15266 * {@link #startAnimation(android.view.animation.Animation)} instead. 15267 * This method provides allows fine-grained 15268 * control over the start time and invalidation, but you 15269 * must make sure that 1) the animation has a start time set, and 15270 * 2) the view's parent (which controls animations on its children) 15271 * will be invalidated when the animation is supposed to 15272 * start. 15273 * 15274 * @param animation The next animation, or null. 15275 */ 15276 public void setAnimation(Animation animation) { 15277 mCurrentAnimation = animation; 15278 15279 if (animation != null) { 15280 // If the screen is off assume the animation start time is now instead of 15281 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15282 // would cause the animation to start when the screen turns back on 15283 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15284 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15285 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15286 } 15287 animation.reset(); 15288 } 15289 } 15290 15291 /** 15292 * Invoked by a parent ViewGroup to notify the start of the animation 15293 * currently associated with this view. If you override this method, 15294 * always call super.onAnimationStart(); 15295 * 15296 * @see #setAnimation(android.view.animation.Animation) 15297 * @see #getAnimation() 15298 */ 15299 protected void onAnimationStart() { 15300 mPrivateFlags |= ANIMATION_STARTED; 15301 } 15302 15303 /** 15304 * Invoked by a parent ViewGroup to notify the end of the animation 15305 * currently associated with this view. If you override this method, 15306 * always call super.onAnimationEnd(); 15307 * 15308 * @see #setAnimation(android.view.animation.Animation) 15309 * @see #getAnimation() 15310 */ 15311 protected void onAnimationEnd() { 15312 mPrivateFlags &= ~ANIMATION_STARTED; 15313 } 15314 15315 /** 15316 * Invoked if there is a Transform that involves alpha. Subclass that can 15317 * draw themselves with the specified alpha should return true, and then 15318 * respect that alpha when their onDraw() is called. If this returns false 15319 * then the view may be redirected to draw into an offscreen buffer to 15320 * fulfill the request, which will look fine, but may be slower than if the 15321 * subclass handles it internally. The default implementation returns false. 15322 * 15323 * @param alpha The alpha (0..255) to apply to the view's drawing 15324 * @return true if the view can draw with the specified alpha. 15325 */ 15326 protected boolean onSetAlpha(int alpha) { 15327 return false; 15328 } 15329 15330 /** 15331 * This is used by the RootView to perform an optimization when 15332 * the view hierarchy contains one or several SurfaceView. 15333 * SurfaceView is always considered transparent, but its children are not, 15334 * therefore all View objects remove themselves from the global transparent 15335 * region (passed as a parameter to this function). 15336 * 15337 * @param region The transparent region for this ViewAncestor (window). 15338 * 15339 * @return Returns true if the effective visibility of the view at this 15340 * point is opaque, regardless of the transparent region; returns false 15341 * if it is possible for underlying windows to be seen behind the view. 15342 * 15343 * {@hide} 15344 */ 15345 public boolean gatherTransparentRegion(Region region) { 15346 final AttachInfo attachInfo = mAttachInfo; 15347 if (region != null && attachInfo != null) { 15348 final int pflags = mPrivateFlags; 15349 if ((pflags & SKIP_DRAW) == 0) { 15350 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15351 // remove it from the transparent region. 15352 final int[] location = attachInfo.mTransparentLocation; 15353 getLocationInWindow(location); 15354 region.op(location[0], location[1], location[0] + mRight - mLeft, 15355 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15356 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15357 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15358 // exists, so we remove the background drawable's non-transparent 15359 // parts from this transparent region. 15360 applyDrawableToTransparentRegion(mBackground, region); 15361 } 15362 } 15363 return true; 15364 } 15365 15366 /** 15367 * Play a sound effect for this view. 15368 * 15369 * <p>The framework will play sound effects for some built in actions, such as 15370 * clicking, but you may wish to play these effects in your widget, 15371 * for instance, for internal navigation. 15372 * 15373 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15374 * {@link #isSoundEffectsEnabled()} is true. 15375 * 15376 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15377 */ 15378 public void playSoundEffect(int soundConstant) { 15379 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15380 return; 15381 } 15382 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15383 } 15384 15385 /** 15386 * BZZZTT!!1! 15387 * 15388 * <p>Provide haptic feedback to the user for this view. 15389 * 15390 * <p>The framework will provide haptic feedback for some built in actions, 15391 * such as long presses, but you may wish to provide feedback for your 15392 * own widget. 15393 * 15394 * <p>The feedback will only be performed if 15395 * {@link #isHapticFeedbackEnabled()} is true. 15396 * 15397 * @param feedbackConstant One of the constants defined in 15398 * {@link HapticFeedbackConstants} 15399 */ 15400 public boolean performHapticFeedback(int feedbackConstant) { 15401 return performHapticFeedback(feedbackConstant, 0); 15402 } 15403 15404 /** 15405 * BZZZTT!!1! 15406 * 15407 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15408 * 15409 * @param feedbackConstant One of the constants defined in 15410 * {@link HapticFeedbackConstants} 15411 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15412 */ 15413 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15414 if (mAttachInfo == null) { 15415 return false; 15416 } 15417 //noinspection SimplifiableIfStatement 15418 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15419 && !isHapticFeedbackEnabled()) { 15420 return false; 15421 } 15422 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15423 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15424 } 15425 15426 /** 15427 * Request that the visibility of the status bar or other screen/window 15428 * decorations be changed. 15429 * 15430 * <p>This method is used to put the over device UI into temporary modes 15431 * where the user's attention is focused more on the application content, 15432 * by dimming or hiding surrounding system affordances. This is typically 15433 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15434 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15435 * to be placed behind the action bar (and with these flags other system 15436 * affordances) so that smooth transitions between hiding and showing them 15437 * can be done. 15438 * 15439 * <p>Two representative examples of the use of system UI visibility is 15440 * implementing a content browsing application (like a magazine reader) 15441 * and a video playing application. 15442 * 15443 * <p>The first code shows a typical implementation of a View in a content 15444 * browsing application. In this implementation, the application goes 15445 * into a content-oriented mode by hiding the status bar and action bar, 15446 * and putting the navigation elements into lights out mode. The user can 15447 * then interact with content while in this mode. Such an application should 15448 * provide an easy way for the user to toggle out of the mode (such as to 15449 * check information in the status bar or access notifications). In the 15450 * implementation here, this is done simply by tapping on the content. 15451 * 15452 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15453 * content} 15454 * 15455 * <p>This second code sample shows a typical implementation of a View 15456 * in a video playing application. In this situation, while the video is 15457 * playing the application would like to go into a complete full-screen mode, 15458 * to use as much of the display as possible for the video. When in this state 15459 * the user can not interact with the application; the system intercepts 15460 * touching on the screen to pop the UI out of full screen mode. See 15461 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15462 * 15463 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15464 * content} 15465 * 15466 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15467 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15468 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15469 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15470 */ 15471 public void setSystemUiVisibility(int visibility) { 15472 if (visibility != mSystemUiVisibility) { 15473 mSystemUiVisibility = visibility; 15474 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15475 mParent.recomputeViewAttributes(this); 15476 } 15477 } 15478 } 15479 15480 /** 15481 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15482 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15483 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15484 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15485 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15486 */ 15487 public int getSystemUiVisibility() { 15488 return mSystemUiVisibility; 15489 } 15490 15491 /** 15492 * Returns the current system UI visibility that is currently set for 15493 * the entire window. This is the combination of the 15494 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15495 * views in the window. 15496 */ 15497 public int getWindowSystemUiVisibility() { 15498 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15499 } 15500 15501 /** 15502 * Override to find out when the window's requested system UI visibility 15503 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15504 * This is different from the callbacks recieved through 15505 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15506 * in that this is only telling you about the local request of the window, 15507 * not the actual values applied by the system. 15508 */ 15509 public void onWindowSystemUiVisibilityChanged(int visible) { 15510 } 15511 15512 /** 15513 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15514 * the view hierarchy. 15515 */ 15516 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15517 onWindowSystemUiVisibilityChanged(visible); 15518 } 15519 15520 /** 15521 * Set a listener to receive callbacks when the visibility of the system bar changes. 15522 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15523 */ 15524 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15525 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15526 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15527 mParent.recomputeViewAttributes(this); 15528 } 15529 } 15530 15531 /** 15532 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15533 * the view hierarchy. 15534 */ 15535 public void dispatchSystemUiVisibilityChanged(int visibility) { 15536 ListenerInfo li = mListenerInfo; 15537 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15538 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15539 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15540 } 15541 } 15542 15543 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15544 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15545 if (val != mSystemUiVisibility) { 15546 setSystemUiVisibility(val); 15547 return true; 15548 } 15549 return false; 15550 } 15551 15552 /** @hide */ 15553 public void setDisabledSystemUiVisibility(int flags) { 15554 if (mAttachInfo != null) { 15555 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15556 mAttachInfo.mDisabledSystemUiVisibility = flags; 15557 if (mParent != null) { 15558 mParent.recomputeViewAttributes(this); 15559 } 15560 } 15561 } 15562 } 15563 15564 /** 15565 * Creates an image that the system displays during the drag and drop 15566 * operation. This is called a "drag shadow". The default implementation 15567 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15568 * appearance as the given View. The default also positions the center of the drag shadow 15569 * directly under the touch point. If no View is provided (the constructor with no parameters 15570 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15571 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15572 * default is an invisible drag shadow. 15573 * <p> 15574 * You are not required to use the View you provide to the constructor as the basis of the 15575 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15576 * anything you want as the drag shadow. 15577 * </p> 15578 * <p> 15579 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15580 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15581 * size and position of the drag shadow. It uses this data to construct a 15582 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15583 * so that your application can draw the shadow image in the Canvas. 15584 * </p> 15585 * 15586 * <div class="special reference"> 15587 * <h3>Developer Guides</h3> 15588 * <p>For a guide to implementing drag and drop features, read the 15589 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15590 * </div> 15591 */ 15592 public static class DragShadowBuilder { 15593 private final WeakReference<View> mView; 15594 15595 /** 15596 * Constructs a shadow image builder based on a View. By default, the resulting drag 15597 * shadow will have the same appearance and dimensions as the View, with the touch point 15598 * over the center of the View. 15599 * @param view A View. Any View in scope can be used. 15600 */ 15601 public DragShadowBuilder(View view) { 15602 mView = new WeakReference<View>(view); 15603 } 15604 15605 /** 15606 * Construct a shadow builder object with no associated View. This 15607 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15608 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15609 * to supply the drag shadow's dimensions and appearance without 15610 * reference to any View object. If they are not overridden, then the result is an 15611 * invisible drag shadow. 15612 */ 15613 public DragShadowBuilder() { 15614 mView = new WeakReference<View>(null); 15615 } 15616 15617 /** 15618 * Returns the View object that had been passed to the 15619 * {@link #View.DragShadowBuilder(View)} 15620 * constructor. If that View parameter was {@code null} or if the 15621 * {@link #View.DragShadowBuilder()} 15622 * constructor was used to instantiate the builder object, this method will return 15623 * null. 15624 * 15625 * @return The View object associate with this builder object. 15626 */ 15627 @SuppressWarnings({"JavadocReference"}) 15628 final public View getView() { 15629 return mView.get(); 15630 } 15631 15632 /** 15633 * Provides the metrics for the shadow image. These include the dimensions of 15634 * the shadow image, and the point within that shadow that should 15635 * be centered under the touch location while dragging. 15636 * <p> 15637 * The default implementation sets the dimensions of the shadow to be the 15638 * same as the dimensions of the View itself and centers the shadow under 15639 * the touch point. 15640 * </p> 15641 * 15642 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15643 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15644 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15645 * image. 15646 * 15647 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15648 * shadow image that should be underneath the touch point during the drag and drop 15649 * operation. Your application must set {@link android.graphics.Point#x} to the 15650 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15651 */ 15652 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15653 final View view = mView.get(); 15654 if (view != null) { 15655 shadowSize.set(view.getWidth(), view.getHeight()); 15656 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15657 } else { 15658 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15659 } 15660 } 15661 15662 /** 15663 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15664 * based on the dimensions it received from the 15665 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15666 * 15667 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15668 */ 15669 public void onDrawShadow(Canvas canvas) { 15670 final View view = mView.get(); 15671 if (view != null) { 15672 view.draw(canvas); 15673 } else { 15674 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15675 } 15676 } 15677 } 15678 15679 /** 15680 * Starts a drag and drop operation. When your application calls this method, it passes a 15681 * {@link android.view.View.DragShadowBuilder} object to the system. The 15682 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15683 * to get metrics for the drag shadow, and then calls the object's 15684 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15685 * <p> 15686 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15687 * drag events to all the View objects in your application that are currently visible. It does 15688 * this either by calling the View object's drag listener (an implementation of 15689 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15690 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15691 * Both are passed a {@link android.view.DragEvent} object that has a 15692 * {@link android.view.DragEvent#getAction()} value of 15693 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15694 * </p> 15695 * <p> 15696 * Your application can invoke startDrag() on any attached View object. The View object does not 15697 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15698 * be related to the View the user selected for dragging. 15699 * </p> 15700 * @param data A {@link android.content.ClipData} object pointing to the data to be 15701 * transferred by the drag and drop operation. 15702 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15703 * drag shadow. 15704 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15705 * drop operation. This Object is put into every DragEvent object sent by the system during the 15706 * current drag. 15707 * <p> 15708 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15709 * to the target Views. For example, it can contain flags that differentiate between a 15710 * a copy operation and a move operation. 15711 * </p> 15712 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15713 * so the parameter should be set to 0. 15714 * @return {@code true} if the method completes successfully, or 15715 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15716 * do a drag, and so no drag operation is in progress. 15717 */ 15718 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15719 Object myLocalState, int flags) { 15720 if (ViewDebug.DEBUG_DRAG) { 15721 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15722 } 15723 boolean okay = false; 15724 15725 Point shadowSize = new Point(); 15726 Point shadowTouchPoint = new Point(); 15727 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15728 15729 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15730 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15731 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15732 } 15733 15734 if (ViewDebug.DEBUG_DRAG) { 15735 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15736 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15737 } 15738 Surface surface = new Surface(); 15739 try { 15740 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15741 flags, shadowSize.x, shadowSize.y, surface); 15742 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15743 + " surface=" + surface); 15744 if (token != null) { 15745 Canvas canvas = surface.lockCanvas(null); 15746 try { 15747 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15748 shadowBuilder.onDrawShadow(canvas); 15749 } finally { 15750 surface.unlockCanvasAndPost(canvas); 15751 } 15752 15753 final ViewRootImpl root = getViewRootImpl(); 15754 15755 // Cache the local state object for delivery with DragEvents 15756 root.setLocalDragState(myLocalState); 15757 15758 // repurpose 'shadowSize' for the last touch point 15759 root.getLastTouchPoint(shadowSize); 15760 15761 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15762 shadowSize.x, shadowSize.y, 15763 shadowTouchPoint.x, shadowTouchPoint.y, data); 15764 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15765 15766 // Off and running! Release our local surface instance; the drag 15767 // shadow surface is now managed by the system process. 15768 surface.release(); 15769 } 15770 } catch (Exception e) { 15771 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15772 surface.destroy(); 15773 } 15774 15775 return okay; 15776 } 15777 15778 /** 15779 * Handles drag events sent by the system following a call to 15780 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15781 *<p> 15782 * When the system calls this method, it passes a 15783 * {@link android.view.DragEvent} object. A call to 15784 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15785 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15786 * operation. 15787 * @param event The {@link android.view.DragEvent} sent by the system. 15788 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15789 * in DragEvent, indicating the type of drag event represented by this object. 15790 * @return {@code true} if the method was successful, otherwise {@code false}. 15791 * <p> 15792 * The method should return {@code true} in response to an action type of 15793 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15794 * operation. 15795 * </p> 15796 * <p> 15797 * The method should also return {@code true} in response to an action type of 15798 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15799 * {@code false} if it didn't. 15800 * </p> 15801 */ 15802 public boolean onDragEvent(DragEvent event) { 15803 return false; 15804 } 15805 15806 /** 15807 * Detects if this View is enabled and has a drag event listener. 15808 * If both are true, then it calls the drag event listener with the 15809 * {@link android.view.DragEvent} it received. If the drag event listener returns 15810 * {@code true}, then dispatchDragEvent() returns {@code true}. 15811 * <p> 15812 * For all other cases, the method calls the 15813 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15814 * method and returns its result. 15815 * </p> 15816 * <p> 15817 * This ensures that a drag event is always consumed, even if the View does not have a drag 15818 * event listener. However, if the View has a listener and the listener returns true, then 15819 * onDragEvent() is not called. 15820 * </p> 15821 */ 15822 public boolean dispatchDragEvent(DragEvent event) { 15823 //noinspection SimplifiableIfStatement 15824 ListenerInfo li = mListenerInfo; 15825 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15826 && li.mOnDragListener.onDrag(this, event)) { 15827 return true; 15828 } 15829 return onDragEvent(event); 15830 } 15831 15832 boolean canAcceptDrag() { 15833 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15834 } 15835 15836 /** 15837 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15838 * it is ever exposed at all. 15839 * @hide 15840 */ 15841 public void onCloseSystemDialogs(String reason) { 15842 } 15843 15844 /** 15845 * Given a Drawable whose bounds have been set to draw into this view, 15846 * update a Region being computed for 15847 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15848 * that any non-transparent parts of the Drawable are removed from the 15849 * given transparent region. 15850 * 15851 * @param dr The Drawable whose transparency is to be applied to the region. 15852 * @param region A Region holding the current transparency information, 15853 * where any parts of the region that are set are considered to be 15854 * transparent. On return, this region will be modified to have the 15855 * transparency information reduced by the corresponding parts of the 15856 * Drawable that are not transparent. 15857 * {@hide} 15858 */ 15859 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15860 if (DBG) { 15861 Log.i("View", "Getting transparent region for: " + this); 15862 } 15863 final Region r = dr.getTransparentRegion(); 15864 final Rect db = dr.getBounds(); 15865 final AttachInfo attachInfo = mAttachInfo; 15866 if (r != null && attachInfo != null) { 15867 final int w = getRight()-getLeft(); 15868 final int h = getBottom()-getTop(); 15869 if (db.left > 0) { 15870 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15871 r.op(0, 0, db.left, h, Region.Op.UNION); 15872 } 15873 if (db.right < w) { 15874 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15875 r.op(db.right, 0, w, h, Region.Op.UNION); 15876 } 15877 if (db.top > 0) { 15878 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15879 r.op(0, 0, w, db.top, Region.Op.UNION); 15880 } 15881 if (db.bottom < h) { 15882 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15883 r.op(0, db.bottom, w, h, Region.Op.UNION); 15884 } 15885 final int[] location = attachInfo.mTransparentLocation; 15886 getLocationInWindow(location); 15887 r.translate(location[0], location[1]); 15888 region.op(r, Region.Op.INTERSECT); 15889 } else { 15890 region.op(db, Region.Op.DIFFERENCE); 15891 } 15892 } 15893 15894 private void checkForLongClick(int delayOffset) { 15895 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15896 mHasPerformedLongPress = false; 15897 15898 if (mPendingCheckForLongPress == null) { 15899 mPendingCheckForLongPress = new CheckForLongPress(); 15900 } 15901 mPendingCheckForLongPress.rememberWindowAttachCount(); 15902 postDelayed(mPendingCheckForLongPress, 15903 ViewConfiguration.getLongPressTimeout() - delayOffset); 15904 } 15905 } 15906 15907 /** 15908 * Inflate a view from an XML resource. This convenience method wraps the {@link 15909 * LayoutInflater} class, which provides a full range of options for view inflation. 15910 * 15911 * @param context The Context object for your activity or application. 15912 * @param resource The resource ID to inflate 15913 * @param root A view group that will be the parent. Used to properly inflate the 15914 * layout_* parameters. 15915 * @see LayoutInflater 15916 */ 15917 public static View inflate(Context context, int resource, ViewGroup root) { 15918 LayoutInflater factory = LayoutInflater.from(context); 15919 return factory.inflate(resource, root); 15920 } 15921 15922 /** 15923 * Scroll the view with standard behavior for scrolling beyond the normal 15924 * content boundaries. Views that call this method should override 15925 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15926 * results of an over-scroll operation. 15927 * 15928 * Views can use this method to handle any touch or fling-based scrolling. 15929 * 15930 * @param deltaX Change in X in pixels 15931 * @param deltaY Change in Y in pixels 15932 * @param scrollX Current X scroll value in pixels before applying deltaX 15933 * @param scrollY Current Y scroll value in pixels before applying deltaY 15934 * @param scrollRangeX Maximum content scroll range along the X axis 15935 * @param scrollRangeY Maximum content scroll range along the Y axis 15936 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15937 * along the X axis. 15938 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15939 * along the Y axis. 15940 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15941 * @return true if scrolling was clamped to an over-scroll boundary along either 15942 * axis, false otherwise. 15943 */ 15944 @SuppressWarnings({"UnusedParameters"}) 15945 protected boolean overScrollBy(int deltaX, int deltaY, 15946 int scrollX, int scrollY, 15947 int scrollRangeX, int scrollRangeY, 15948 int maxOverScrollX, int maxOverScrollY, 15949 boolean isTouchEvent) { 15950 final int overScrollMode = mOverScrollMode; 15951 final boolean canScrollHorizontal = 15952 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15953 final boolean canScrollVertical = 15954 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15955 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15956 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15957 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15958 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15959 15960 int newScrollX = scrollX + deltaX; 15961 if (!overScrollHorizontal) { 15962 maxOverScrollX = 0; 15963 } 15964 15965 int newScrollY = scrollY + deltaY; 15966 if (!overScrollVertical) { 15967 maxOverScrollY = 0; 15968 } 15969 15970 // Clamp values if at the limits and record 15971 final int left = -maxOverScrollX; 15972 final int right = maxOverScrollX + scrollRangeX; 15973 final int top = -maxOverScrollY; 15974 final int bottom = maxOverScrollY + scrollRangeY; 15975 15976 boolean clampedX = false; 15977 if (newScrollX > right) { 15978 newScrollX = right; 15979 clampedX = true; 15980 } else if (newScrollX < left) { 15981 newScrollX = left; 15982 clampedX = true; 15983 } 15984 15985 boolean clampedY = false; 15986 if (newScrollY > bottom) { 15987 newScrollY = bottom; 15988 clampedY = true; 15989 } else if (newScrollY < top) { 15990 newScrollY = top; 15991 clampedY = true; 15992 } 15993 15994 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15995 15996 return clampedX || clampedY; 15997 } 15998 15999 /** 16000 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16001 * respond to the results of an over-scroll operation. 16002 * 16003 * @param scrollX New X scroll value in pixels 16004 * @param scrollY New Y scroll value in pixels 16005 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16006 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16007 */ 16008 protected void onOverScrolled(int scrollX, int scrollY, 16009 boolean clampedX, boolean clampedY) { 16010 // Intentionally empty. 16011 } 16012 16013 /** 16014 * Returns the over-scroll mode for this view. The result will be 16015 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16016 * (allow over-scrolling only if the view content is larger than the container), 16017 * or {@link #OVER_SCROLL_NEVER}. 16018 * 16019 * @return This view's over-scroll mode. 16020 */ 16021 public int getOverScrollMode() { 16022 return mOverScrollMode; 16023 } 16024 16025 /** 16026 * Set the over-scroll mode for this view. Valid over-scroll modes are 16027 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16028 * (allow over-scrolling only if the view content is larger than the container), 16029 * or {@link #OVER_SCROLL_NEVER}. 16030 * 16031 * Setting the over-scroll mode of a view will have an effect only if the 16032 * view is capable of scrolling. 16033 * 16034 * @param overScrollMode The new over-scroll mode for this view. 16035 */ 16036 public void setOverScrollMode(int overScrollMode) { 16037 if (overScrollMode != OVER_SCROLL_ALWAYS && 16038 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16039 overScrollMode != OVER_SCROLL_NEVER) { 16040 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16041 } 16042 mOverScrollMode = overScrollMode; 16043 } 16044 16045 /** 16046 * Gets a scale factor that determines the distance the view should scroll 16047 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16048 * @return The vertical scroll scale factor. 16049 * @hide 16050 */ 16051 protected float getVerticalScrollFactor() { 16052 if (mVerticalScrollFactor == 0) { 16053 TypedValue outValue = new TypedValue(); 16054 if (!mContext.getTheme().resolveAttribute( 16055 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16056 throw new IllegalStateException( 16057 "Expected theme to define listPreferredItemHeight."); 16058 } 16059 mVerticalScrollFactor = outValue.getDimension( 16060 mContext.getResources().getDisplayMetrics()); 16061 } 16062 return mVerticalScrollFactor; 16063 } 16064 16065 /** 16066 * Gets a scale factor that determines the distance the view should scroll 16067 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16068 * @return The horizontal scroll scale factor. 16069 * @hide 16070 */ 16071 protected float getHorizontalScrollFactor() { 16072 // TODO: Should use something else. 16073 return getVerticalScrollFactor(); 16074 } 16075 16076 /** 16077 * Return the value specifying the text direction or policy that was set with 16078 * {@link #setTextDirection(int)}. 16079 * 16080 * @return the defined text direction. It can be one of: 16081 * 16082 * {@link #TEXT_DIRECTION_INHERIT}, 16083 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16084 * {@link #TEXT_DIRECTION_ANY_RTL}, 16085 * {@link #TEXT_DIRECTION_LTR}, 16086 * {@link #TEXT_DIRECTION_RTL}, 16087 * {@link #TEXT_DIRECTION_LOCALE} 16088 */ 16089 @ViewDebug.ExportedProperty(category = "text", mapping = { 16090 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16091 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16092 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16093 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16094 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16095 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16096 }) 16097 public int getTextDirection() { 16098 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16099 } 16100 16101 /** 16102 * Set the text direction. 16103 * 16104 * @param textDirection the direction to set. Should be one of: 16105 * 16106 * {@link #TEXT_DIRECTION_INHERIT}, 16107 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16108 * {@link #TEXT_DIRECTION_ANY_RTL}, 16109 * {@link #TEXT_DIRECTION_LTR}, 16110 * {@link #TEXT_DIRECTION_RTL}, 16111 * {@link #TEXT_DIRECTION_LOCALE} 16112 */ 16113 public void setTextDirection(int textDirection) { 16114 if (getTextDirection() != textDirection) { 16115 // Reset the current text direction and the resolved one 16116 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16117 resetResolvedTextDirection(); 16118 // Set the new text direction 16119 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16120 // Refresh 16121 requestLayout(); 16122 invalidate(true); 16123 } 16124 } 16125 16126 /** 16127 * Return the resolved text direction. 16128 * 16129 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16130 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16131 * up the parent chain of the view. if there is no parent, then it will return the default 16132 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16133 * 16134 * @return the resolved text direction. Returns one of: 16135 * 16136 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16137 * {@link #TEXT_DIRECTION_ANY_RTL}, 16138 * {@link #TEXT_DIRECTION_LTR}, 16139 * {@link #TEXT_DIRECTION_RTL}, 16140 * {@link #TEXT_DIRECTION_LOCALE} 16141 */ 16142 public int getResolvedTextDirection() { 16143 // The text direction will be resolved only if needed 16144 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16145 resolveTextDirection(); 16146 } 16147 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16148 } 16149 16150 /** 16151 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16152 * resolution is done. 16153 */ 16154 public void resolveTextDirection() { 16155 // Reset any previous text direction resolution 16156 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16157 16158 if (hasRtlSupport()) { 16159 // Set resolved text direction flag depending on text direction flag 16160 final int textDirection = getTextDirection(); 16161 switch(textDirection) { 16162 case TEXT_DIRECTION_INHERIT: 16163 if (canResolveTextDirection()) { 16164 ViewGroup viewGroup = ((ViewGroup) mParent); 16165 16166 // Set current resolved direction to the same value as the parent's one 16167 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16168 switch (parentResolvedDirection) { 16169 case TEXT_DIRECTION_FIRST_STRONG: 16170 case TEXT_DIRECTION_ANY_RTL: 16171 case TEXT_DIRECTION_LTR: 16172 case TEXT_DIRECTION_RTL: 16173 case TEXT_DIRECTION_LOCALE: 16174 mPrivateFlags2 |= 16175 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16176 break; 16177 default: 16178 // Default resolved direction is "first strong" heuristic 16179 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16180 } 16181 } else { 16182 // We cannot do the resolution if there is no parent, so use the default one 16183 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16184 } 16185 break; 16186 case TEXT_DIRECTION_FIRST_STRONG: 16187 case TEXT_DIRECTION_ANY_RTL: 16188 case TEXT_DIRECTION_LTR: 16189 case TEXT_DIRECTION_RTL: 16190 case TEXT_DIRECTION_LOCALE: 16191 // Resolved direction is the same as text direction 16192 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16193 break; 16194 default: 16195 // Default resolved direction is "first strong" heuristic 16196 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16197 } 16198 } else { 16199 // Default resolved direction is "first strong" heuristic 16200 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16201 } 16202 16203 // Set to resolved 16204 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16205 onResolvedTextDirectionChanged(); 16206 } 16207 16208 /** 16209 * Called when text direction has been resolved. Subclasses that care about text direction 16210 * resolution should override this method. 16211 * 16212 * The default implementation does nothing. 16213 */ 16214 public void onResolvedTextDirectionChanged() { 16215 } 16216 16217 /** 16218 * Check if text direction resolution can be done. 16219 * 16220 * @return true if text direction resolution can be done otherwise return false. 16221 */ 16222 public boolean canResolveTextDirection() { 16223 switch (getTextDirection()) { 16224 case TEXT_DIRECTION_INHERIT: 16225 return (mParent != null) && (mParent instanceof ViewGroup); 16226 default: 16227 return true; 16228 } 16229 } 16230 16231 /** 16232 * Reset resolved text direction. Text direction can be resolved with a call to 16233 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16234 * reset is done. 16235 */ 16236 public void resetResolvedTextDirection() { 16237 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16238 onResolvedTextDirectionReset(); 16239 } 16240 16241 /** 16242 * Called when text direction is reset. Subclasses that care about text direction reset should 16243 * override this method and do a reset of the text direction of their children. The default 16244 * implementation does nothing. 16245 */ 16246 public void onResolvedTextDirectionReset() { 16247 } 16248 16249 /** 16250 * Return the value specifying the text alignment or policy that was set with 16251 * {@link #setTextAlignment(int)}. 16252 * 16253 * @return the defined text alignment. It can be one of: 16254 * 16255 * {@link #TEXT_ALIGNMENT_INHERIT}, 16256 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16257 * {@link #TEXT_ALIGNMENT_CENTER}, 16258 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16259 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16260 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16261 * {@link #TEXT_ALIGNMENT_VIEW_END} 16262 */ 16263 @ViewDebug.ExportedProperty(category = "text", mapping = { 16264 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16265 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16266 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16267 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16268 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16269 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16270 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16271 }) 16272 public int getTextAlignment() { 16273 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16274 } 16275 16276 /** 16277 * Set the text alignment. 16278 * 16279 * @param textAlignment The text alignment to set. Should be one of 16280 * 16281 * {@link #TEXT_ALIGNMENT_INHERIT}, 16282 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16283 * {@link #TEXT_ALIGNMENT_CENTER}, 16284 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16285 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16286 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16287 * {@link #TEXT_ALIGNMENT_VIEW_END} 16288 * 16289 * @attr ref android.R.styleable#View_textAlignment 16290 */ 16291 public void setTextAlignment(int textAlignment) { 16292 if (textAlignment != getTextAlignment()) { 16293 // Reset the current and resolved text alignment 16294 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16295 resetResolvedTextAlignment(); 16296 // Set the new text alignment 16297 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16298 // Refresh 16299 requestLayout(); 16300 invalidate(true); 16301 } 16302 } 16303 16304 /** 16305 * Return the resolved text alignment. 16306 * 16307 * The resolved text alignment. This needs resolution if the value is 16308 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16309 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16310 * 16311 * @return the resolved text alignment. Returns one of: 16312 * 16313 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16314 * {@link #TEXT_ALIGNMENT_CENTER}, 16315 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16316 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16317 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16318 * {@link #TEXT_ALIGNMENT_VIEW_END} 16319 */ 16320 @ViewDebug.ExportedProperty(category = "text", mapping = { 16321 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16322 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16323 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16324 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16325 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16326 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16327 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16328 }) 16329 public int getResolvedTextAlignment() { 16330 // If text alignment is not resolved, then resolve it 16331 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16332 resolveTextAlignment(); 16333 } 16334 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16335 } 16336 16337 /** 16338 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16339 * resolution is done. 16340 */ 16341 public void resolveTextAlignment() { 16342 // Reset any previous text alignment resolution 16343 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16344 16345 if (hasRtlSupport()) { 16346 // Set resolved text alignment flag depending on text alignment flag 16347 final int textAlignment = getTextAlignment(); 16348 switch (textAlignment) { 16349 case TEXT_ALIGNMENT_INHERIT: 16350 // Check if we can resolve the text alignment 16351 if (canResolveLayoutDirection() && mParent instanceof View) { 16352 View view = (View) mParent; 16353 16354 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16355 switch (parentResolvedTextAlignment) { 16356 case TEXT_ALIGNMENT_GRAVITY: 16357 case TEXT_ALIGNMENT_TEXT_START: 16358 case TEXT_ALIGNMENT_TEXT_END: 16359 case TEXT_ALIGNMENT_CENTER: 16360 case TEXT_ALIGNMENT_VIEW_START: 16361 case TEXT_ALIGNMENT_VIEW_END: 16362 // Resolved text alignment is the same as the parent resolved 16363 // text alignment 16364 mPrivateFlags2 |= 16365 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16366 break; 16367 default: 16368 // Use default resolved text alignment 16369 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16370 } 16371 } 16372 else { 16373 // We cannot do the resolution if there is no parent so use the default 16374 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16375 } 16376 break; 16377 case TEXT_ALIGNMENT_GRAVITY: 16378 case TEXT_ALIGNMENT_TEXT_START: 16379 case TEXT_ALIGNMENT_TEXT_END: 16380 case TEXT_ALIGNMENT_CENTER: 16381 case TEXT_ALIGNMENT_VIEW_START: 16382 case TEXT_ALIGNMENT_VIEW_END: 16383 // Resolved text alignment is the same as text alignment 16384 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16385 break; 16386 default: 16387 // Use default resolved text alignment 16388 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16389 } 16390 } else { 16391 // Use default resolved text alignment 16392 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16393 } 16394 16395 // Set the resolved 16396 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16397 onResolvedTextAlignmentChanged(); 16398 } 16399 16400 /** 16401 * Check if text alignment resolution can be done. 16402 * 16403 * @return true if text alignment resolution can be done otherwise return false. 16404 */ 16405 public boolean canResolveTextAlignment() { 16406 switch (getTextAlignment()) { 16407 case TEXT_DIRECTION_INHERIT: 16408 return (mParent != null); 16409 default: 16410 return true; 16411 } 16412 } 16413 16414 /** 16415 * Called when text alignment has been resolved. Subclasses that care about text alignment 16416 * resolution should override this method. 16417 * 16418 * The default implementation does nothing. 16419 */ 16420 public void onResolvedTextAlignmentChanged() { 16421 } 16422 16423 /** 16424 * Reset resolved text alignment. Text alignment can be resolved with a call to 16425 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16426 * reset is done. 16427 */ 16428 public void resetResolvedTextAlignment() { 16429 // Reset any previous text alignment resolution 16430 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16431 onResolvedTextAlignmentReset(); 16432 } 16433 16434 /** 16435 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16436 * override this method and do a reset of the text alignment of their children. The default 16437 * implementation does nothing. 16438 */ 16439 public void onResolvedTextAlignmentReset() { 16440 } 16441 16442 // 16443 // Properties 16444 // 16445 /** 16446 * A Property wrapper around the <code>alpha</code> functionality handled by the 16447 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16448 */ 16449 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16450 @Override 16451 public void setValue(View object, float value) { 16452 object.setAlpha(value); 16453 } 16454 16455 @Override 16456 public Float get(View object) { 16457 return object.getAlpha(); 16458 } 16459 }; 16460 16461 /** 16462 * A Property wrapper around the <code>translationX</code> functionality handled by the 16463 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16464 */ 16465 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16466 @Override 16467 public void setValue(View object, float value) { 16468 object.setTranslationX(value); 16469 } 16470 16471 @Override 16472 public Float get(View object) { 16473 return object.getTranslationX(); 16474 } 16475 }; 16476 16477 /** 16478 * A Property wrapper around the <code>translationY</code> functionality handled by the 16479 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16480 */ 16481 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16482 @Override 16483 public void setValue(View object, float value) { 16484 object.setTranslationY(value); 16485 } 16486 16487 @Override 16488 public Float get(View object) { 16489 return object.getTranslationY(); 16490 } 16491 }; 16492 16493 /** 16494 * A Property wrapper around the <code>x</code> functionality handled by the 16495 * {@link View#setX(float)} and {@link View#getX()} methods. 16496 */ 16497 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16498 @Override 16499 public void setValue(View object, float value) { 16500 object.setX(value); 16501 } 16502 16503 @Override 16504 public Float get(View object) { 16505 return object.getX(); 16506 } 16507 }; 16508 16509 /** 16510 * A Property wrapper around the <code>y</code> functionality handled by the 16511 * {@link View#setY(float)} and {@link View#getY()} methods. 16512 */ 16513 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16514 @Override 16515 public void setValue(View object, float value) { 16516 object.setY(value); 16517 } 16518 16519 @Override 16520 public Float get(View object) { 16521 return object.getY(); 16522 } 16523 }; 16524 16525 /** 16526 * A Property wrapper around the <code>rotation</code> functionality handled by the 16527 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16528 */ 16529 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16530 @Override 16531 public void setValue(View object, float value) { 16532 object.setRotation(value); 16533 } 16534 16535 @Override 16536 public Float get(View object) { 16537 return object.getRotation(); 16538 } 16539 }; 16540 16541 /** 16542 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16543 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16544 */ 16545 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16546 @Override 16547 public void setValue(View object, float value) { 16548 object.setRotationX(value); 16549 } 16550 16551 @Override 16552 public Float get(View object) { 16553 return object.getRotationX(); 16554 } 16555 }; 16556 16557 /** 16558 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16559 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16560 */ 16561 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16562 @Override 16563 public void setValue(View object, float value) { 16564 object.setRotationY(value); 16565 } 16566 16567 @Override 16568 public Float get(View object) { 16569 return object.getRotationY(); 16570 } 16571 }; 16572 16573 /** 16574 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16575 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16576 */ 16577 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16578 @Override 16579 public void setValue(View object, float value) { 16580 object.setScaleX(value); 16581 } 16582 16583 @Override 16584 public Float get(View object) { 16585 return object.getScaleX(); 16586 } 16587 }; 16588 16589 /** 16590 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16591 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16592 */ 16593 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16594 @Override 16595 public void setValue(View object, float value) { 16596 object.setScaleY(value); 16597 } 16598 16599 @Override 16600 public Float get(View object) { 16601 return object.getScaleY(); 16602 } 16603 }; 16604 16605 /** 16606 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16607 * Each MeasureSpec represents a requirement for either the width or the height. 16608 * A MeasureSpec is comprised of a size and a mode. There are three possible 16609 * modes: 16610 * <dl> 16611 * <dt>UNSPECIFIED</dt> 16612 * <dd> 16613 * The parent has not imposed any constraint on the child. It can be whatever size 16614 * it wants. 16615 * </dd> 16616 * 16617 * <dt>EXACTLY</dt> 16618 * <dd> 16619 * The parent has determined an exact size for the child. The child is going to be 16620 * given those bounds regardless of how big it wants to be. 16621 * </dd> 16622 * 16623 * <dt>AT_MOST</dt> 16624 * <dd> 16625 * The child can be as large as it wants up to the specified size. 16626 * </dd> 16627 * </dl> 16628 * 16629 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16630 * is provided to pack and unpack the <size, mode> tuple into the int. 16631 */ 16632 public static class MeasureSpec { 16633 private static final int MODE_SHIFT = 30; 16634 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16635 16636 /** 16637 * Measure specification mode: The parent has not imposed any constraint 16638 * on the child. It can be whatever size it wants. 16639 */ 16640 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16641 16642 /** 16643 * Measure specification mode: The parent has determined an exact size 16644 * for the child. The child is going to be given those bounds regardless 16645 * of how big it wants to be. 16646 */ 16647 public static final int EXACTLY = 1 << MODE_SHIFT; 16648 16649 /** 16650 * Measure specification mode: The child can be as large as it wants up 16651 * to the specified size. 16652 */ 16653 public static final int AT_MOST = 2 << MODE_SHIFT; 16654 16655 /** 16656 * Creates a measure specification based on the supplied size and mode. 16657 * 16658 * The mode must always be one of the following: 16659 * <ul> 16660 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16661 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16662 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16663 * </ul> 16664 * 16665 * @param size the size of the measure specification 16666 * @param mode the mode of the measure specification 16667 * @return the measure specification based on size and mode 16668 */ 16669 public static int makeMeasureSpec(int size, int mode) { 16670 return size + mode; 16671 } 16672 16673 /** 16674 * Extracts the mode from the supplied measure specification. 16675 * 16676 * @param measureSpec the measure specification to extract the mode from 16677 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16678 * {@link android.view.View.MeasureSpec#AT_MOST} or 16679 * {@link android.view.View.MeasureSpec#EXACTLY} 16680 */ 16681 public static int getMode(int measureSpec) { 16682 return (measureSpec & MODE_MASK); 16683 } 16684 16685 /** 16686 * Extracts the size from the supplied measure specification. 16687 * 16688 * @param measureSpec the measure specification to extract the size from 16689 * @return the size in pixels defined in the supplied measure specification 16690 */ 16691 public static int getSize(int measureSpec) { 16692 return (measureSpec & ~MODE_MASK); 16693 } 16694 16695 /** 16696 * Returns a String representation of the specified measure 16697 * specification. 16698 * 16699 * @param measureSpec the measure specification to convert to a String 16700 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16701 */ 16702 public static String toString(int measureSpec) { 16703 int mode = getMode(measureSpec); 16704 int size = getSize(measureSpec); 16705 16706 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16707 16708 if (mode == UNSPECIFIED) 16709 sb.append("UNSPECIFIED "); 16710 else if (mode == EXACTLY) 16711 sb.append("EXACTLY "); 16712 else if (mode == AT_MOST) 16713 sb.append("AT_MOST "); 16714 else 16715 sb.append(mode).append(" "); 16716 16717 sb.append(size); 16718 return sb.toString(); 16719 } 16720 } 16721 16722 class CheckForLongPress implements Runnable { 16723 16724 private int mOriginalWindowAttachCount; 16725 16726 public void run() { 16727 if (isPressed() && (mParent != null) 16728 && mOriginalWindowAttachCount == mWindowAttachCount) { 16729 if (performLongClick()) { 16730 mHasPerformedLongPress = true; 16731 } 16732 } 16733 } 16734 16735 public void rememberWindowAttachCount() { 16736 mOriginalWindowAttachCount = mWindowAttachCount; 16737 } 16738 } 16739 16740 private final class CheckForTap implements Runnable { 16741 public void run() { 16742 mPrivateFlags &= ~PREPRESSED; 16743 setPressed(true); 16744 checkForLongClick(ViewConfiguration.getTapTimeout()); 16745 } 16746 } 16747 16748 private final class PerformClick implements Runnable { 16749 public void run() { 16750 performClick(); 16751 } 16752 } 16753 16754 /** @hide */ 16755 public void hackTurnOffWindowResizeAnim(boolean off) { 16756 mAttachInfo.mTurnOffWindowResizeAnim = off; 16757 } 16758 16759 /** 16760 * This method returns a ViewPropertyAnimator object, which can be used to animate 16761 * specific properties on this View. 16762 * 16763 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16764 */ 16765 public ViewPropertyAnimator animate() { 16766 if (mAnimator == null) { 16767 mAnimator = new ViewPropertyAnimator(this); 16768 } 16769 return mAnimator; 16770 } 16771 16772 /** 16773 * Interface definition for a callback to be invoked when a key event is 16774 * dispatched to this view. The callback will be invoked before the key 16775 * event is given to the view. 16776 */ 16777 public interface OnKeyListener { 16778 /** 16779 * Called when a key is dispatched to a view. This allows listeners to 16780 * get a chance to respond before the target view. 16781 * 16782 * @param v The view the key has been dispatched to. 16783 * @param keyCode The code for the physical key that was pressed 16784 * @param event The KeyEvent object containing full information about 16785 * the event. 16786 * @return True if the listener has consumed the event, false otherwise. 16787 */ 16788 boolean onKey(View v, int keyCode, KeyEvent event); 16789 } 16790 16791 /** 16792 * Interface definition for a callback to be invoked when a touch event is 16793 * dispatched to this view. The callback will be invoked before the touch 16794 * event is given to the view. 16795 */ 16796 public interface OnTouchListener { 16797 /** 16798 * Called when a touch event is dispatched to a view. This allows listeners to 16799 * get a chance to respond before the target view. 16800 * 16801 * @param v The view the touch event has been dispatched to. 16802 * @param event The MotionEvent object containing full information about 16803 * the event. 16804 * @return True if the listener has consumed the event, false otherwise. 16805 */ 16806 boolean onTouch(View v, MotionEvent event); 16807 } 16808 16809 /** 16810 * Interface definition for a callback to be invoked when a hover event is 16811 * dispatched to this view. The callback will be invoked before the hover 16812 * event is given to the view. 16813 */ 16814 public interface OnHoverListener { 16815 /** 16816 * Called when a hover event is dispatched to a view. This allows listeners to 16817 * get a chance to respond before the target view. 16818 * 16819 * @param v The view the hover event has been dispatched to. 16820 * @param event The MotionEvent object containing full information about 16821 * the event. 16822 * @return True if the listener has consumed the event, false otherwise. 16823 */ 16824 boolean onHover(View v, MotionEvent event); 16825 } 16826 16827 /** 16828 * Interface definition for a callback to be invoked when a generic motion event is 16829 * dispatched to this view. The callback will be invoked before the generic motion 16830 * event is given to the view. 16831 */ 16832 public interface OnGenericMotionListener { 16833 /** 16834 * Called when a generic motion event is dispatched to a view. This allows listeners to 16835 * get a chance to respond before the target view. 16836 * 16837 * @param v The view the generic motion event has been dispatched to. 16838 * @param event The MotionEvent object containing full information about 16839 * the event. 16840 * @return True if the listener has consumed the event, false otherwise. 16841 */ 16842 boolean onGenericMotion(View v, MotionEvent event); 16843 } 16844 16845 /** 16846 * Interface definition for a callback to be invoked when a view has been clicked and held. 16847 */ 16848 public interface OnLongClickListener { 16849 /** 16850 * Called when a view has been clicked and held. 16851 * 16852 * @param v The view that was clicked and held. 16853 * 16854 * @return true if the callback consumed the long click, false otherwise. 16855 */ 16856 boolean onLongClick(View v); 16857 } 16858 16859 /** 16860 * Interface definition for a callback to be invoked when a drag is being dispatched 16861 * to this view. The callback will be invoked before the hosting view's own 16862 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16863 * onDrag(event) behavior, it should return 'false' from this callback. 16864 * 16865 * <div class="special reference"> 16866 * <h3>Developer Guides</h3> 16867 * <p>For a guide to implementing drag and drop features, read the 16868 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16869 * </div> 16870 */ 16871 public interface OnDragListener { 16872 /** 16873 * Called when a drag event is dispatched to a view. This allows listeners 16874 * to get a chance to override base View behavior. 16875 * 16876 * @param v The View that received the drag event. 16877 * @param event The {@link android.view.DragEvent} object for the drag event. 16878 * @return {@code true} if the drag event was handled successfully, or {@code false} 16879 * if the drag event was not handled. Note that {@code false} will trigger the View 16880 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16881 */ 16882 boolean onDrag(View v, DragEvent event); 16883 } 16884 16885 /** 16886 * Interface definition for a callback to be invoked when the focus state of 16887 * a view changed. 16888 */ 16889 public interface OnFocusChangeListener { 16890 /** 16891 * Called when the focus state of a view has changed. 16892 * 16893 * @param v The view whose state has changed. 16894 * @param hasFocus The new focus state of v. 16895 */ 16896 void onFocusChange(View v, boolean hasFocus); 16897 } 16898 16899 /** 16900 * Interface definition for a callback to be invoked when a view is clicked. 16901 */ 16902 public interface OnClickListener { 16903 /** 16904 * Called when a view has been clicked. 16905 * 16906 * @param v The view that was clicked. 16907 */ 16908 void onClick(View v); 16909 } 16910 16911 /** 16912 * Interface definition for a callback to be invoked when the context menu 16913 * for this view is being built. 16914 */ 16915 public interface OnCreateContextMenuListener { 16916 /** 16917 * Called when the context menu for this view is being built. It is not 16918 * safe to hold onto the menu after this method returns. 16919 * 16920 * @param menu The context menu that is being built 16921 * @param v The view for which the context menu is being built 16922 * @param menuInfo Extra information about the item for which the 16923 * context menu should be shown. This information will vary 16924 * depending on the class of v. 16925 */ 16926 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16927 } 16928 16929 /** 16930 * Interface definition for a callback to be invoked when the status bar changes 16931 * visibility. This reports <strong>global</strong> changes to the system UI 16932 * state, not what the application is requesting. 16933 * 16934 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16935 */ 16936 public interface OnSystemUiVisibilityChangeListener { 16937 /** 16938 * Called when the status bar changes visibility because of a call to 16939 * {@link View#setSystemUiVisibility(int)}. 16940 * 16941 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16942 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16943 * This tells you the <strong>global</strong> state of these UI visibility 16944 * flags, not what your app is currently applying. 16945 */ 16946 public void onSystemUiVisibilityChange(int visibility); 16947 } 16948 16949 /** 16950 * Interface definition for a callback to be invoked when this view is attached 16951 * or detached from its window. 16952 */ 16953 public interface OnAttachStateChangeListener { 16954 /** 16955 * Called when the view is attached to a window. 16956 * @param v The view that was attached 16957 */ 16958 public void onViewAttachedToWindow(View v); 16959 /** 16960 * Called when the view is detached from a window. 16961 * @param v The view that was detached 16962 */ 16963 public void onViewDetachedFromWindow(View v); 16964 } 16965 16966 private final class UnsetPressedState implements Runnable { 16967 public void run() { 16968 setPressed(false); 16969 } 16970 } 16971 16972 /** 16973 * Base class for derived classes that want to save and restore their own 16974 * state in {@link android.view.View#onSaveInstanceState()}. 16975 */ 16976 public static class BaseSavedState extends AbsSavedState { 16977 /** 16978 * Constructor used when reading from a parcel. Reads the state of the superclass. 16979 * 16980 * @param source 16981 */ 16982 public BaseSavedState(Parcel source) { 16983 super(source); 16984 } 16985 16986 /** 16987 * Constructor called by derived classes when creating their SavedState objects 16988 * 16989 * @param superState The state of the superclass of this view 16990 */ 16991 public BaseSavedState(Parcelable superState) { 16992 super(superState); 16993 } 16994 16995 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16996 new Parcelable.Creator<BaseSavedState>() { 16997 public BaseSavedState createFromParcel(Parcel in) { 16998 return new BaseSavedState(in); 16999 } 17000 17001 public BaseSavedState[] newArray(int size) { 17002 return new BaseSavedState[size]; 17003 } 17004 }; 17005 } 17006 17007 /** 17008 * A set of information given to a view when it is attached to its parent 17009 * window. 17010 */ 17011 static class AttachInfo { 17012 interface Callbacks { 17013 void playSoundEffect(int effectId); 17014 boolean performHapticFeedback(int effectId, boolean always); 17015 } 17016 17017 /** 17018 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17019 * to a Handler. This class contains the target (View) to invalidate and 17020 * the coordinates of the dirty rectangle. 17021 * 17022 * For performance purposes, this class also implements a pool of up to 17023 * POOL_LIMIT objects that get reused. This reduces memory allocations 17024 * whenever possible. 17025 */ 17026 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17027 private static final int POOL_LIMIT = 10; 17028 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17029 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17030 public InvalidateInfo newInstance() { 17031 return new InvalidateInfo(); 17032 } 17033 17034 public void onAcquired(InvalidateInfo element) { 17035 } 17036 17037 public void onReleased(InvalidateInfo element) { 17038 element.target = null; 17039 } 17040 }, POOL_LIMIT) 17041 ); 17042 17043 private InvalidateInfo mNext; 17044 private boolean mIsPooled; 17045 17046 View target; 17047 17048 int left; 17049 int top; 17050 int right; 17051 int bottom; 17052 17053 public void setNextPoolable(InvalidateInfo element) { 17054 mNext = element; 17055 } 17056 17057 public InvalidateInfo getNextPoolable() { 17058 return mNext; 17059 } 17060 17061 static InvalidateInfo acquire() { 17062 return sPool.acquire(); 17063 } 17064 17065 void release() { 17066 sPool.release(this); 17067 } 17068 17069 public boolean isPooled() { 17070 return mIsPooled; 17071 } 17072 17073 public void setPooled(boolean isPooled) { 17074 mIsPooled = isPooled; 17075 } 17076 } 17077 17078 final IWindowSession mSession; 17079 17080 final IWindow mWindow; 17081 17082 final IBinder mWindowToken; 17083 17084 final Callbacks mRootCallbacks; 17085 17086 HardwareCanvas mHardwareCanvas; 17087 17088 /** 17089 * The top view of the hierarchy. 17090 */ 17091 View mRootView; 17092 17093 IBinder mPanelParentWindowToken; 17094 Surface mSurface; 17095 17096 boolean mHardwareAccelerated; 17097 boolean mHardwareAccelerationRequested; 17098 HardwareRenderer mHardwareRenderer; 17099 17100 boolean mScreenOn; 17101 17102 /** 17103 * Scale factor used by the compatibility mode 17104 */ 17105 float mApplicationScale; 17106 17107 /** 17108 * Indicates whether the application is in compatibility mode 17109 */ 17110 boolean mScalingRequired; 17111 17112 /** 17113 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17114 */ 17115 boolean mTurnOffWindowResizeAnim; 17116 17117 /** 17118 * Left position of this view's window 17119 */ 17120 int mWindowLeft; 17121 17122 /** 17123 * Top position of this view's window 17124 */ 17125 int mWindowTop; 17126 17127 /** 17128 * Indicates whether views need to use 32-bit drawing caches 17129 */ 17130 boolean mUse32BitDrawingCache; 17131 17132 /** 17133 * For windows that are full-screen but using insets to layout inside 17134 * of the screen decorations, these are the current insets for the 17135 * content of the window. 17136 */ 17137 final Rect mContentInsets = new Rect(); 17138 17139 /** 17140 * For windows that are full-screen but using insets to layout inside 17141 * of the screen decorations, these are the current insets for the 17142 * actual visible parts of the window. 17143 */ 17144 final Rect mVisibleInsets = new Rect(); 17145 17146 /** 17147 * The internal insets given by this window. This value is 17148 * supplied by the client (through 17149 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17150 * be given to the window manager when changed to be used in laying 17151 * out windows behind it. 17152 */ 17153 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17154 = new ViewTreeObserver.InternalInsetsInfo(); 17155 17156 /** 17157 * All views in the window's hierarchy that serve as scroll containers, 17158 * used to determine if the window can be resized or must be panned 17159 * to adjust for a soft input area. 17160 */ 17161 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17162 17163 final KeyEvent.DispatcherState mKeyDispatchState 17164 = new KeyEvent.DispatcherState(); 17165 17166 /** 17167 * Indicates whether the view's window currently has the focus. 17168 */ 17169 boolean mHasWindowFocus; 17170 17171 /** 17172 * The current visibility of the window. 17173 */ 17174 int mWindowVisibility; 17175 17176 /** 17177 * Indicates the time at which drawing started to occur. 17178 */ 17179 long mDrawingTime; 17180 17181 /** 17182 * Indicates whether or not ignoring the DIRTY_MASK flags. 17183 */ 17184 boolean mIgnoreDirtyState; 17185 17186 /** 17187 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17188 * to avoid clearing that flag prematurely. 17189 */ 17190 boolean mSetIgnoreDirtyState = false; 17191 17192 /** 17193 * Indicates whether the view's window is currently in touch mode. 17194 */ 17195 boolean mInTouchMode; 17196 17197 /** 17198 * Indicates that ViewAncestor should trigger a global layout change 17199 * the next time it performs a traversal 17200 */ 17201 boolean mRecomputeGlobalAttributes; 17202 17203 /** 17204 * Always report new attributes at next traversal. 17205 */ 17206 boolean mForceReportNewAttributes; 17207 17208 /** 17209 * Set during a traveral if any views want to keep the screen on. 17210 */ 17211 boolean mKeepScreenOn; 17212 17213 /** 17214 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17215 */ 17216 int mSystemUiVisibility; 17217 17218 /** 17219 * Hack to force certain system UI visibility flags to be cleared. 17220 */ 17221 int mDisabledSystemUiVisibility; 17222 17223 /** 17224 * Last global system UI visibility reported by the window manager. 17225 */ 17226 int mGlobalSystemUiVisibility; 17227 17228 /** 17229 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17230 * attached. 17231 */ 17232 boolean mHasSystemUiListeners; 17233 17234 /** 17235 * Set if the visibility of any views has changed. 17236 */ 17237 boolean mViewVisibilityChanged; 17238 17239 /** 17240 * Set to true if a view has been scrolled. 17241 */ 17242 boolean mViewScrollChanged; 17243 17244 /** 17245 * Global to the view hierarchy used as a temporary for dealing with 17246 * x/y points in the transparent region computations. 17247 */ 17248 final int[] mTransparentLocation = new int[2]; 17249 17250 /** 17251 * Global to the view hierarchy used as a temporary for dealing with 17252 * x/y points in the ViewGroup.invalidateChild implementation. 17253 */ 17254 final int[] mInvalidateChildLocation = new int[2]; 17255 17256 17257 /** 17258 * Global to the view hierarchy used as a temporary for dealing with 17259 * x/y location when view is transformed. 17260 */ 17261 final float[] mTmpTransformLocation = new float[2]; 17262 17263 /** 17264 * The view tree observer used to dispatch global events like 17265 * layout, pre-draw, touch mode change, etc. 17266 */ 17267 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17268 17269 /** 17270 * A Canvas used by the view hierarchy to perform bitmap caching. 17271 */ 17272 Canvas mCanvas; 17273 17274 /** 17275 * The view root impl. 17276 */ 17277 final ViewRootImpl mViewRootImpl; 17278 17279 /** 17280 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17281 * handler can be used to pump events in the UI events queue. 17282 */ 17283 final Handler mHandler; 17284 17285 /** 17286 * Temporary for use in computing invalidate rectangles while 17287 * calling up the hierarchy. 17288 */ 17289 final Rect mTmpInvalRect = new Rect(); 17290 17291 /** 17292 * Temporary for use in computing hit areas with transformed views 17293 */ 17294 final RectF mTmpTransformRect = new RectF(); 17295 17296 /** 17297 * Temporary list for use in collecting focusable descendents of a view. 17298 */ 17299 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17300 17301 /** 17302 * The id of the window for accessibility purposes. 17303 */ 17304 int mAccessibilityWindowId = View.NO_ID; 17305 17306 /** 17307 * Whether to ingore not exposed for accessibility Views when 17308 * reporting the view tree to accessibility services. 17309 */ 17310 boolean mIncludeNotImportantViews; 17311 17312 /** 17313 * The drawable for highlighting accessibility focus. 17314 */ 17315 Drawable mAccessibilityFocusDrawable; 17316 17317 /** 17318 * Show where the margins, bounds and layout bounds are for each view. 17319 */ 17320 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17321 17322 /** 17323 * Point used to compute visible regions. 17324 */ 17325 final Point mPoint = new Point(); 17326 17327 /** 17328 * Creates a new set of attachment information with the specified 17329 * events handler and thread. 17330 * 17331 * @param handler the events handler the view must use 17332 */ 17333 AttachInfo(IWindowSession session, IWindow window, 17334 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17335 mSession = session; 17336 mWindow = window; 17337 mWindowToken = window.asBinder(); 17338 mViewRootImpl = viewRootImpl; 17339 mHandler = handler; 17340 mRootCallbacks = effectPlayer; 17341 } 17342 } 17343 17344 /** 17345 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17346 * is supported. This avoids keeping too many unused fields in most 17347 * instances of View.</p> 17348 */ 17349 private static class ScrollabilityCache implements Runnable { 17350 17351 /** 17352 * Scrollbars are not visible 17353 */ 17354 public static final int OFF = 0; 17355 17356 /** 17357 * Scrollbars are visible 17358 */ 17359 public static final int ON = 1; 17360 17361 /** 17362 * Scrollbars are fading away 17363 */ 17364 public static final int FADING = 2; 17365 17366 public boolean fadeScrollBars; 17367 17368 public int fadingEdgeLength; 17369 public int scrollBarDefaultDelayBeforeFade; 17370 public int scrollBarFadeDuration; 17371 17372 public int scrollBarSize; 17373 public ScrollBarDrawable scrollBar; 17374 public float[] interpolatorValues; 17375 public View host; 17376 17377 public final Paint paint; 17378 public final Matrix matrix; 17379 public Shader shader; 17380 17381 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17382 17383 private static final float[] OPAQUE = { 255 }; 17384 private static final float[] TRANSPARENT = { 0.0f }; 17385 17386 /** 17387 * When fading should start. This time moves into the future every time 17388 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17389 */ 17390 public long fadeStartTime; 17391 17392 17393 /** 17394 * The current state of the scrollbars: ON, OFF, or FADING 17395 */ 17396 public int state = OFF; 17397 17398 private int mLastColor; 17399 17400 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17401 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17402 scrollBarSize = configuration.getScaledScrollBarSize(); 17403 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17404 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17405 17406 paint = new Paint(); 17407 matrix = new Matrix(); 17408 // use use a height of 1, and then wack the matrix each time we 17409 // actually use it. 17410 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17411 17412 paint.setShader(shader); 17413 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17414 this.host = host; 17415 } 17416 17417 public void setFadeColor(int color) { 17418 if (color != 0 && color != mLastColor) { 17419 mLastColor = color; 17420 color |= 0xFF000000; 17421 17422 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17423 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17424 17425 paint.setShader(shader); 17426 // Restore the default transfer mode (src_over) 17427 paint.setXfermode(null); 17428 } 17429 } 17430 17431 public void run() { 17432 long now = AnimationUtils.currentAnimationTimeMillis(); 17433 if (now >= fadeStartTime) { 17434 17435 // the animation fades the scrollbars out by changing 17436 // the opacity (alpha) from fully opaque to fully 17437 // transparent 17438 int nextFrame = (int) now; 17439 int framesCount = 0; 17440 17441 Interpolator interpolator = scrollBarInterpolator; 17442 17443 // Start opaque 17444 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17445 17446 // End transparent 17447 nextFrame += scrollBarFadeDuration; 17448 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17449 17450 state = FADING; 17451 17452 // Kick off the fade animation 17453 host.invalidate(true); 17454 } 17455 } 17456 } 17457 17458 /** 17459 * Resuable callback for sending 17460 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17461 */ 17462 private class SendViewScrolledAccessibilityEvent implements Runnable { 17463 public volatile boolean mIsPending; 17464 17465 public void run() { 17466 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17467 mIsPending = false; 17468 } 17469 } 17470 17471 /** 17472 * <p> 17473 * This class represents a delegate that can be registered in a {@link View} 17474 * to enhance accessibility support via composition rather via inheritance. 17475 * It is specifically targeted to widget developers that extend basic View 17476 * classes i.e. classes in package android.view, that would like their 17477 * applications to be backwards compatible. 17478 * </p> 17479 * <div class="special reference"> 17480 * <h3>Developer Guides</h3> 17481 * <p>For more information about making applications accessible, read the 17482 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17483 * developer guide.</p> 17484 * </div> 17485 * <p> 17486 * A scenario in which a developer would like to use an accessibility delegate 17487 * is overriding a method introduced in a later API version then the minimal API 17488 * version supported by the application. For example, the method 17489 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17490 * in API version 4 when the accessibility APIs were first introduced. If a 17491 * developer would like his application to run on API version 4 devices (assuming 17492 * all other APIs used by the application are version 4 or lower) and take advantage 17493 * of this method, instead of overriding the method which would break the application's 17494 * backwards compatibility, he can override the corresponding method in this 17495 * delegate and register the delegate in the target View if the API version of 17496 * the system is high enough i.e. the API version is same or higher to the API 17497 * version that introduced 17498 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17499 * </p> 17500 * <p> 17501 * Here is an example implementation: 17502 * </p> 17503 * <code><pre><p> 17504 * if (Build.VERSION.SDK_INT >= 14) { 17505 * // If the API version is equal of higher than the version in 17506 * // which onInitializeAccessibilityNodeInfo was introduced we 17507 * // register a delegate with a customized implementation. 17508 * View view = findViewById(R.id.view_id); 17509 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17510 * public void onInitializeAccessibilityNodeInfo(View host, 17511 * AccessibilityNodeInfo info) { 17512 * // Let the default implementation populate the info. 17513 * super.onInitializeAccessibilityNodeInfo(host, info); 17514 * // Set some other information. 17515 * info.setEnabled(host.isEnabled()); 17516 * } 17517 * }); 17518 * } 17519 * </code></pre></p> 17520 * <p> 17521 * This delegate contains methods that correspond to the accessibility methods 17522 * in View. If a delegate has been specified the implementation in View hands 17523 * off handling to the corresponding method in this delegate. The default 17524 * implementation the delegate methods behaves exactly as the corresponding 17525 * method in View for the case of no accessibility delegate been set. Hence, 17526 * to customize the behavior of a View method, clients can override only the 17527 * corresponding delegate method without altering the behavior of the rest 17528 * accessibility related methods of the host view. 17529 * </p> 17530 */ 17531 public static class AccessibilityDelegate { 17532 17533 /** 17534 * Sends an accessibility event of the given type. If accessibility is not 17535 * enabled this method has no effect. 17536 * <p> 17537 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17538 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17539 * been set. 17540 * </p> 17541 * 17542 * @param host The View hosting the delegate. 17543 * @param eventType The type of the event to send. 17544 * 17545 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17546 */ 17547 public void sendAccessibilityEvent(View host, int eventType) { 17548 host.sendAccessibilityEventInternal(eventType); 17549 } 17550 17551 /** 17552 * Performs the specified accessibility action on the view. For 17553 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17554 * <p> 17555 * The default implementation behaves as 17556 * {@link View#performAccessibilityAction(int, Bundle) 17557 * View#performAccessibilityAction(int, Bundle)} for the case of 17558 * no accessibility delegate been set. 17559 * </p> 17560 * 17561 * @param action The action to perform. 17562 * @return Whether the action was performed. 17563 * 17564 * @see View#performAccessibilityAction(int, Bundle) 17565 * View#performAccessibilityAction(int, Bundle) 17566 */ 17567 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17568 return host.performAccessibilityActionInternal(action, args); 17569 } 17570 17571 /** 17572 * Sends an accessibility event. This method behaves exactly as 17573 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17574 * empty {@link AccessibilityEvent} and does not perform a check whether 17575 * accessibility is enabled. 17576 * <p> 17577 * The default implementation behaves as 17578 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17579 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17580 * the case of no accessibility delegate been set. 17581 * </p> 17582 * 17583 * @param host The View hosting the delegate. 17584 * @param event The event to send. 17585 * 17586 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17587 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17588 */ 17589 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17590 host.sendAccessibilityEventUncheckedInternal(event); 17591 } 17592 17593 /** 17594 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17595 * to its children for adding their text content to the event. 17596 * <p> 17597 * The default implementation behaves as 17598 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17599 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17600 * the case of no accessibility delegate been set. 17601 * </p> 17602 * 17603 * @param host The View hosting the delegate. 17604 * @param event The event. 17605 * @return True if the event population was completed. 17606 * 17607 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17608 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17609 */ 17610 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17611 return host.dispatchPopulateAccessibilityEventInternal(event); 17612 } 17613 17614 /** 17615 * Gives a chance to the host View to populate the accessibility event with its 17616 * text content. 17617 * <p> 17618 * The default implementation behaves as 17619 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17620 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17621 * the case of no accessibility delegate been set. 17622 * </p> 17623 * 17624 * @param host The View hosting the delegate. 17625 * @param event The accessibility event which to populate. 17626 * 17627 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17628 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17629 */ 17630 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17631 host.onPopulateAccessibilityEventInternal(event); 17632 } 17633 17634 /** 17635 * Initializes an {@link AccessibilityEvent} with information about the 17636 * the host View which is the event source. 17637 * <p> 17638 * The default implementation behaves as 17639 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17640 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17641 * the case of no accessibility delegate been set. 17642 * </p> 17643 * 17644 * @param host The View hosting the delegate. 17645 * @param event The event to initialize. 17646 * 17647 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17648 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17649 */ 17650 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17651 host.onInitializeAccessibilityEventInternal(event); 17652 } 17653 17654 /** 17655 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17656 * <p> 17657 * The default implementation behaves as 17658 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17659 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17660 * the case of no accessibility delegate been set. 17661 * </p> 17662 * 17663 * @param host The View hosting the delegate. 17664 * @param info The instance to initialize. 17665 * 17666 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17667 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17668 */ 17669 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17670 host.onInitializeAccessibilityNodeInfoInternal(info); 17671 } 17672 17673 /** 17674 * Called when a child of the host View has requested sending an 17675 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17676 * to augment the event. 17677 * <p> 17678 * The default implementation behaves as 17679 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17680 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17681 * the case of no accessibility delegate been set. 17682 * </p> 17683 * 17684 * @param host The View hosting the delegate. 17685 * @param child The child which requests sending the event. 17686 * @param event The event to be sent. 17687 * @return True if the event should be sent 17688 * 17689 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17690 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17691 */ 17692 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17693 AccessibilityEvent event) { 17694 return host.onRequestSendAccessibilityEventInternal(child, event); 17695 } 17696 17697 /** 17698 * Gets the provider for managing a virtual view hierarchy rooted at this View 17699 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17700 * that explore the window content. 17701 * <p> 17702 * The default implementation behaves as 17703 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17704 * the case of no accessibility delegate been set. 17705 * </p> 17706 * 17707 * @return The provider. 17708 * 17709 * @see AccessibilityNodeProvider 17710 */ 17711 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17712 return null; 17713 } 17714 } 17715} 17716