View.java revision 7d3082a3f09e32e7c42b2896e90902157039b10e
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 hardware key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a hardware 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, 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 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1011 * item. 1012 */ 1013 public static final int FOCUS_BACKWARD = 0x00000001; 1014 1015 /** 1016 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1017 * item. 1018 */ 1019 public static final int FOCUS_FORWARD = 0x00000002; 1020 1021 /** 1022 * Use with {@link #focusSearch(int)}. Move focus to the left. 1023 */ 1024 public static final int FOCUS_LEFT = 0x00000011; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus up. 1028 */ 1029 public static final int FOCUS_UP = 0x00000021; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move focus to the right. 1033 */ 1034 public static final int FOCUS_RIGHT = 0x00000042; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus down. 1038 */ 1039 public static final int FOCUS_DOWN = 0x00000082; 1040 1041 /** 1042 * Bits of {@link #getMeasuredWidthAndState()} and 1043 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1044 */ 1045 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1046 1047 /** 1048 * Bits of {@link #getMeasuredWidthAndState()} and 1049 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1050 */ 1051 public static final int MEASURED_STATE_MASK = 0xff000000; 1052 1053 /** 1054 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1055 * for functions that combine both width and height into a single int, 1056 * such as {@link #getMeasuredState()} and the childState argument of 1057 * {@link #resolveSizeAndState(int, int, int)}. 1058 */ 1059 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1060 1061 /** 1062 * Bit of {@link #getMeasuredWidthAndState()} and 1063 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1064 * is smaller that the space the view would like to have. 1065 */ 1066 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1067 1068 /** 1069 * Base View state sets 1070 */ 1071 // Singles 1072 /** 1073 * Indicates the view has no states set. States are used with 1074 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1075 * view depending on its state. 1076 * 1077 * @see android.graphics.drawable.Drawable 1078 * @see #getDrawableState() 1079 */ 1080 protected static final int[] EMPTY_STATE_SET; 1081 /** 1082 * Indicates the view is enabled. States are used with 1083 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1084 * view depending on its state. 1085 * 1086 * @see android.graphics.drawable.Drawable 1087 * @see #getDrawableState() 1088 */ 1089 protected static final int[] ENABLED_STATE_SET; 1090 /** 1091 * Indicates the view is focused. States are used with 1092 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1093 * view depending on its state. 1094 * 1095 * @see android.graphics.drawable.Drawable 1096 * @see #getDrawableState() 1097 */ 1098 protected static final int[] FOCUSED_STATE_SET; 1099 /** 1100 * Indicates the view is selected. States are used with 1101 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1102 * view depending on its state. 1103 * 1104 * @see android.graphics.drawable.Drawable 1105 * @see #getDrawableState() 1106 */ 1107 protected static final int[] SELECTED_STATE_SET; 1108 /** 1109 * Indicates the view is pressed. States are used with 1110 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1111 * view depending on its state. 1112 * 1113 * @see android.graphics.drawable.Drawable 1114 * @see #getDrawableState() 1115 * @hide 1116 */ 1117 protected static final int[] PRESSED_STATE_SET; 1118 /** 1119 * Indicates the view's window has focus. 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[] WINDOW_FOCUSED_STATE_SET; 1127 // Doubles 1128 /** 1129 * Indicates the view is enabled and has the focus. 1130 * 1131 * @see #ENABLED_STATE_SET 1132 * @see #FOCUSED_STATE_SET 1133 */ 1134 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1135 /** 1136 * Indicates the view is enabled and selected. 1137 * 1138 * @see #ENABLED_STATE_SET 1139 * @see #SELECTED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_SELECTED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled and that its window has focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #WINDOW_FOCUSED_STATE_SET 1147 */ 1148 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1149 /** 1150 * Indicates the view is focused and selected. 1151 * 1152 * @see #FOCUSED_STATE_SET 1153 * @see #SELECTED_STATE_SET 1154 */ 1155 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1156 /** 1157 * Indicates the view has the focus and that its window has the focus. 1158 * 1159 * @see #FOCUSED_STATE_SET 1160 * @see #WINDOW_FOCUSED_STATE_SET 1161 */ 1162 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1163 /** 1164 * Indicates the view is selected and that its window has the focus. 1165 * 1166 * @see #SELECTED_STATE_SET 1167 * @see #WINDOW_FOCUSED_STATE_SET 1168 */ 1169 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1170 // Triples 1171 /** 1172 * Indicates the view is enabled, focused and selected. 1173 * 1174 * @see #ENABLED_STATE_SET 1175 * @see #FOCUSED_STATE_SET 1176 * @see #SELECTED_STATE_SET 1177 */ 1178 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1179 /** 1180 * Indicates the view is enabled, focused and its window has the focus. 1181 * 1182 * @see #ENABLED_STATE_SET 1183 * @see #FOCUSED_STATE_SET 1184 * @see #WINDOW_FOCUSED_STATE_SET 1185 */ 1186 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1187 /** 1188 * Indicates the view is enabled, selected and its window has the focus. 1189 * 1190 * @see #ENABLED_STATE_SET 1191 * @see #SELECTED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1195 /** 1196 * Indicates the view is focused, selected and its window has the focus. 1197 * 1198 * @see #FOCUSED_STATE_SET 1199 * @see #SELECTED_STATE_SET 1200 * @see #WINDOW_FOCUSED_STATE_SET 1201 */ 1202 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1203 /** 1204 * Indicates the view is enabled, focused, selected and its window 1205 * has the focus. 1206 * 1207 * @see #ENABLED_STATE_SET 1208 * @see #FOCUSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed and its window has the focus. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #WINDOW_FOCUSED_STATE_SET 1218 */ 1219 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1220 /** 1221 * Indicates the view is pressed and selected. 1222 * 1223 * @see #PRESSED_STATE_SET 1224 * @see #SELECTED_STATE_SET 1225 */ 1226 protected static final int[] PRESSED_SELECTED_STATE_SET; 1227 /** 1228 * Indicates the view is pressed, selected and its window has the focus. 1229 * 1230 * @see #PRESSED_STATE_SET 1231 * @see #SELECTED_STATE_SET 1232 * @see #WINDOW_FOCUSED_STATE_SET 1233 */ 1234 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1235 /** 1236 * Indicates the view is pressed and focused. 1237 * 1238 * @see #PRESSED_STATE_SET 1239 * @see #FOCUSED_STATE_SET 1240 */ 1241 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1242 /** 1243 * Indicates the view is pressed, focused and its window has the focus. 1244 * 1245 * @see #PRESSED_STATE_SET 1246 * @see #FOCUSED_STATE_SET 1247 * @see #WINDOW_FOCUSED_STATE_SET 1248 */ 1249 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1250 /** 1251 * Indicates the view is pressed, focused and selected. 1252 * 1253 * @see #PRESSED_STATE_SET 1254 * @see #SELECTED_STATE_SET 1255 * @see #FOCUSED_STATE_SET 1256 */ 1257 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1258 /** 1259 * Indicates the view is pressed, focused, selected and its window has the focus. 1260 * 1261 * @see #PRESSED_STATE_SET 1262 * @see #FOCUSED_STATE_SET 1263 * @see #SELECTED_STATE_SET 1264 * @see #WINDOW_FOCUSED_STATE_SET 1265 */ 1266 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1267 /** 1268 * Indicates the view is pressed and enabled. 1269 * 1270 * @see #PRESSED_STATE_SET 1271 * @see #ENABLED_STATE_SET 1272 */ 1273 protected static final int[] PRESSED_ENABLED_STATE_SET; 1274 /** 1275 * Indicates the view is pressed, enabled and its window has the focus. 1276 * 1277 * @see #PRESSED_STATE_SET 1278 * @see #ENABLED_STATE_SET 1279 * @see #WINDOW_FOCUSED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled and selected. 1284 * 1285 * @see #PRESSED_STATE_SET 1286 * @see #ENABLED_STATE_SET 1287 * @see #SELECTED_STATE_SET 1288 */ 1289 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1290 /** 1291 * Indicates the view is pressed, enabled, selected and its window has the 1292 * focus. 1293 * 1294 * @see #PRESSED_STATE_SET 1295 * @see #ENABLED_STATE_SET 1296 * @see #SELECTED_STATE_SET 1297 * @see #WINDOW_FOCUSED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, enabled and focused. 1302 * 1303 * @see #PRESSED_STATE_SET 1304 * @see #ENABLED_STATE_SET 1305 * @see #FOCUSED_STATE_SET 1306 */ 1307 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1308 /** 1309 * Indicates the view is pressed, enabled, focused and its window has the 1310 * focus. 1311 * 1312 * @see #PRESSED_STATE_SET 1313 * @see #ENABLED_STATE_SET 1314 * @see #FOCUSED_STATE_SET 1315 * @see #WINDOW_FOCUSED_STATE_SET 1316 */ 1317 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1318 /** 1319 * Indicates the view is pressed, enabled, focused and selected. 1320 * 1321 * @see #PRESSED_STATE_SET 1322 * @see #ENABLED_STATE_SET 1323 * @see #SELECTED_STATE_SET 1324 * @see #FOCUSED_STATE_SET 1325 */ 1326 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1327 /** 1328 * Indicates the view is pressed, enabled, focused, selected and its window 1329 * has the focus. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 * @see #FOCUSED_STATE_SET 1335 * @see #WINDOW_FOCUSED_STATE_SET 1336 */ 1337 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1338 1339 /** 1340 * The order here is very important to {@link #getDrawableState()} 1341 */ 1342 private static final int[][] VIEW_STATE_SETS; 1343 1344 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1345 static final int VIEW_STATE_SELECTED = 1 << 1; 1346 static final int VIEW_STATE_FOCUSED = 1 << 2; 1347 static final int VIEW_STATE_ENABLED = 1 << 3; 1348 static final int VIEW_STATE_PRESSED = 1 << 4; 1349 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1350 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1351 static final int VIEW_STATE_HOVERED = 1 << 7; 1352 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1353 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1354 1355 static final int[] VIEW_STATE_IDS = new int[] { 1356 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1357 R.attr.state_selected, VIEW_STATE_SELECTED, 1358 R.attr.state_focused, VIEW_STATE_FOCUSED, 1359 R.attr.state_enabled, VIEW_STATE_ENABLED, 1360 R.attr.state_pressed, VIEW_STATE_PRESSED, 1361 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1362 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1363 R.attr.state_hovered, VIEW_STATE_HOVERED, 1364 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1365 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1366 }; 1367 1368 static { 1369 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1370 throw new IllegalStateException( 1371 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1372 } 1373 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1374 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1375 int viewState = R.styleable.ViewDrawableStates[i]; 1376 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1377 if (VIEW_STATE_IDS[j] == viewState) { 1378 orderedIds[i * 2] = viewState; 1379 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1380 } 1381 } 1382 } 1383 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1384 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1385 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1386 int numBits = Integer.bitCount(i); 1387 int[] set = new int[numBits]; 1388 int pos = 0; 1389 for (int j = 0; j < orderedIds.length; j += 2) { 1390 if ((i & orderedIds[j+1]) != 0) { 1391 set[pos++] = orderedIds[j]; 1392 } 1393 } 1394 VIEW_STATE_SETS[i] = set; 1395 } 1396 1397 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1398 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1399 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1400 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1402 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1403 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1405 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1406 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1407 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1408 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1409 | VIEW_STATE_FOCUSED]; 1410 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1411 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1413 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1415 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1417 | VIEW_STATE_ENABLED]; 1418 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1420 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1421 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1422 | VIEW_STATE_ENABLED]; 1423 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1425 | VIEW_STATE_ENABLED]; 1426 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1428 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1429 1430 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1431 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1433 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1435 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1436 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1437 | VIEW_STATE_PRESSED]; 1438 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1439 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1440 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1441 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1442 | VIEW_STATE_PRESSED]; 1443 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1445 | VIEW_STATE_PRESSED]; 1446 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1449 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1451 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1462 | VIEW_STATE_PRESSED]; 1463 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1465 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1466 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1469 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1471 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1472 | VIEW_STATE_PRESSED]; 1473 } 1474 1475 /** 1476 * Accessibility event types that are dispatched for text population. 1477 */ 1478 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1479 AccessibilityEvent.TYPE_VIEW_CLICKED 1480 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1481 | AccessibilityEvent.TYPE_VIEW_SELECTED 1482 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1483 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1484 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1485 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1486 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1487 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1488 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1489 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1490 1491 /** 1492 * Temporary Rect currently for use in setBackground(). This will probably 1493 * be extended in the future to hold our own class with more than just 1494 * a Rect. :) 1495 */ 1496 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1497 1498 /** 1499 * Map used to store views' tags. 1500 */ 1501 private SparseArray<Object> mKeyedTags; 1502 1503 /** 1504 * The next available accessiiblity id. 1505 */ 1506 private static int sNextAccessibilityViewId; 1507 1508 /** 1509 * The animation currently associated with this view. 1510 * @hide 1511 */ 1512 protected Animation mCurrentAnimation = null; 1513 1514 /** 1515 * Width as measured during measure pass. 1516 * {@hide} 1517 */ 1518 @ViewDebug.ExportedProperty(category = "measurement") 1519 int mMeasuredWidth; 1520 1521 /** 1522 * Height as measured during measure pass. 1523 * {@hide} 1524 */ 1525 @ViewDebug.ExportedProperty(category = "measurement") 1526 int mMeasuredHeight; 1527 1528 /** 1529 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1530 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1531 * its display list. This flag, used only when hw accelerated, allows us to clear the 1532 * flag while retaining this information until it's needed (at getDisplayList() time and 1533 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1534 * 1535 * {@hide} 1536 */ 1537 boolean mRecreateDisplayList = false; 1538 1539 /** 1540 * The view's identifier. 1541 * {@hide} 1542 * 1543 * @see #setId(int) 1544 * @see #getId() 1545 */ 1546 @ViewDebug.ExportedProperty(resolveId = true) 1547 int mID = NO_ID; 1548 1549 /** 1550 * The stable ID of this view for accessibility purposes. 1551 */ 1552 int mAccessibilityViewId = NO_ID; 1553 1554 /** 1555 * @hide 1556 */ 1557 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1558 1559 /** 1560 * The view's tag. 1561 * {@hide} 1562 * 1563 * @see #setTag(Object) 1564 * @see #getTag() 1565 */ 1566 protected Object mTag; 1567 1568 // for mPrivateFlags: 1569 /** {@hide} */ 1570 static final int WANTS_FOCUS = 0x00000001; 1571 /** {@hide} */ 1572 static final int FOCUSED = 0x00000002; 1573 /** {@hide} */ 1574 static final int SELECTED = 0x00000004; 1575 /** {@hide} */ 1576 static final int IS_ROOT_NAMESPACE = 0x00000008; 1577 /** {@hide} */ 1578 static final int HAS_BOUNDS = 0x00000010; 1579 /** {@hide} */ 1580 static final int DRAWN = 0x00000020; 1581 /** 1582 * When this flag is set, this view is running an animation on behalf of its 1583 * children and should therefore not cancel invalidate requests, even if they 1584 * lie outside of this view's bounds. 1585 * 1586 * {@hide} 1587 */ 1588 static final int DRAW_ANIMATION = 0x00000040; 1589 /** {@hide} */ 1590 static final int SKIP_DRAW = 0x00000080; 1591 /** {@hide} */ 1592 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1593 /** {@hide} */ 1594 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1595 /** {@hide} */ 1596 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1597 /** {@hide} */ 1598 static final int MEASURED_DIMENSION_SET = 0x00000800; 1599 /** {@hide} */ 1600 static final int FORCE_LAYOUT = 0x00001000; 1601 /** {@hide} */ 1602 static final int LAYOUT_REQUIRED = 0x00002000; 1603 1604 private static final int PRESSED = 0x00004000; 1605 1606 /** {@hide} */ 1607 static final int DRAWING_CACHE_VALID = 0x00008000; 1608 /** 1609 * Flag used to indicate that this view should be drawn once more (and only once 1610 * more) after its animation has completed. 1611 * {@hide} 1612 */ 1613 static final int ANIMATION_STARTED = 0x00010000; 1614 1615 private static final int SAVE_STATE_CALLED = 0x00020000; 1616 1617 /** 1618 * Indicates that the View returned true when onSetAlpha() was called and that 1619 * the alpha must be restored. 1620 * {@hide} 1621 */ 1622 static final int ALPHA_SET = 0x00040000; 1623 1624 /** 1625 * Set by {@link #setScrollContainer(boolean)}. 1626 */ 1627 static final int SCROLL_CONTAINER = 0x00080000; 1628 1629 /** 1630 * Set by {@link #setScrollContainer(boolean)}. 1631 */ 1632 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1633 1634 /** 1635 * View flag indicating whether this view was invalidated (fully or partially.) 1636 * 1637 * @hide 1638 */ 1639 static final int DIRTY = 0x00200000; 1640 1641 /** 1642 * View flag indicating whether this view was invalidated by an opaque 1643 * invalidate request. 1644 * 1645 * @hide 1646 */ 1647 static final int DIRTY_OPAQUE = 0x00400000; 1648 1649 /** 1650 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1651 * 1652 * @hide 1653 */ 1654 static final int DIRTY_MASK = 0x00600000; 1655 1656 /** 1657 * Indicates whether the background is opaque. 1658 * 1659 * @hide 1660 */ 1661 static final int OPAQUE_BACKGROUND = 0x00800000; 1662 1663 /** 1664 * Indicates whether the scrollbars are opaque. 1665 * 1666 * @hide 1667 */ 1668 static final int OPAQUE_SCROLLBARS = 0x01000000; 1669 1670 /** 1671 * Indicates whether the view is opaque. 1672 * 1673 * @hide 1674 */ 1675 static final int OPAQUE_MASK = 0x01800000; 1676 1677 /** 1678 * Indicates a prepressed state; 1679 * the short time between ACTION_DOWN and recognizing 1680 * a 'real' press. Prepressed is used to recognize quick taps 1681 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1682 * 1683 * @hide 1684 */ 1685 private static final int PREPRESSED = 0x02000000; 1686 1687 /** 1688 * Indicates whether the view is temporarily detached. 1689 * 1690 * @hide 1691 */ 1692 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1693 1694 /** 1695 * Indicates that we should awaken scroll bars once attached 1696 * 1697 * @hide 1698 */ 1699 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1700 1701 /** 1702 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1703 * @hide 1704 */ 1705 private static final int HOVERED = 0x10000000; 1706 1707 /** 1708 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1709 * for transform operations 1710 * 1711 * @hide 1712 */ 1713 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1714 1715 /** {@hide} */ 1716 static final int ACTIVATED = 0x40000000; 1717 1718 /** 1719 * Indicates that this view was specifically invalidated, not just dirtied because some 1720 * child view was invalidated. The flag is used to determine when we need to recreate 1721 * a view's display list (as opposed to just returning a reference to its existing 1722 * display list). 1723 * 1724 * @hide 1725 */ 1726 static final int INVALIDATED = 0x80000000; 1727 1728 /* Masks for mPrivateFlags2 */ 1729 1730 /** 1731 * Indicates that this view has reported that it can accept the current drag's content. 1732 * Cleared when the drag operation concludes. 1733 * @hide 1734 */ 1735 static final int DRAG_CAN_ACCEPT = 0x00000001; 1736 1737 /** 1738 * Indicates that this view is currently directly under the drag location in a 1739 * drag-and-drop operation involving content that it can accept. Cleared when 1740 * the drag exits the view, or when the drag operation concludes. 1741 * @hide 1742 */ 1743 static final int DRAG_HOVERED = 0x00000002; 1744 1745 /** 1746 * Horizontal layout direction of this view is from Left to Right. 1747 * Use with {@link #setLayoutDirection}. 1748 */ 1749 public static final int LAYOUT_DIRECTION_LTR = 0; 1750 1751 /** 1752 * Horizontal layout direction of this view is from Right to Left. 1753 * Use with {@link #setLayoutDirection}. 1754 */ 1755 public static final int LAYOUT_DIRECTION_RTL = 1; 1756 1757 /** 1758 * Horizontal layout direction of this view is inherited from its parent. 1759 * Use with {@link #setLayoutDirection}. 1760 */ 1761 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1762 1763 /** 1764 * Horizontal layout direction of this view is from deduced from the default language 1765 * script for the locale. Use with {@link #setLayoutDirection}. 1766 */ 1767 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1768 1769 /** 1770 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1771 * @hide 1772 */ 1773 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1774 1775 /** 1776 * Mask for use with private flags indicating bits used for horizontal layout direction. 1777 * @hide 1778 */ 1779 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1780 1781 /** 1782 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1783 * right-to-left direction. 1784 * @hide 1785 */ 1786 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1787 1788 /** 1789 * Indicates whether the view horizontal layout direction has been resolved. 1790 * @hide 1791 */ 1792 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1793 1794 /** 1795 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1796 * @hide 1797 */ 1798 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1799 1800 /* 1801 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1802 * flag value. 1803 * @hide 1804 */ 1805 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1806 LAYOUT_DIRECTION_LTR, 1807 LAYOUT_DIRECTION_RTL, 1808 LAYOUT_DIRECTION_INHERIT, 1809 LAYOUT_DIRECTION_LOCALE 1810 }; 1811 1812 /** 1813 * Default horizontal layout direction. 1814 * @hide 1815 */ 1816 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1817 1818 /** 1819 * Indicates that the view is tracking some sort of transient state 1820 * that the app should not need to be aware of, but that the framework 1821 * should take special care to preserve. 1822 * 1823 * @hide 1824 */ 1825 static final int HAS_TRANSIENT_STATE = 0x00000100; 1826 1827 1828 /** 1829 * Text direction is inherited thru {@link ViewGroup} 1830 */ 1831 public static final int TEXT_DIRECTION_INHERIT = 0; 1832 1833 /** 1834 * Text direction is using "first strong algorithm". The first strong directional character 1835 * determines the paragraph direction. If there is no strong directional character, the 1836 * paragraph direction is the view's resolved layout direction. 1837 */ 1838 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1839 1840 /** 1841 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1842 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1843 * If there are neither, the paragraph direction is the view's resolved layout direction. 1844 */ 1845 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1846 1847 /** 1848 * Text direction is forced to LTR. 1849 */ 1850 public static final int TEXT_DIRECTION_LTR = 3; 1851 1852 /** 1853 * Text direction is forced to RTL. 1854 */ 1855 public static final int TEXT_DIRECTION_RTL = 4; 1856 1857 /** 1858 * Text direction is coming from the system Locale. 1859 */ 1860 public static final int TEXT_DIRECTION_LOCALE = 5; 1861 1862 /** 1863 * Default text direction is inherited 1864 */ 1865 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1866 1867 /** 1868 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1869 * @hide 1870 */ 1871 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1872 1873 /** 1874 * Mask for use with private flags indicating bits used for text direction. 1875 * @hide 1876 */ 1877 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1878 1879 /** 1880 * Array of text direction flags for mapping attribute "textDirection" to correct 1881 * flag value. 1882 * @hide 1883 */ 1884 private static final int[] TEXT_DIRECTION_FLAGS = { 1885 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1886 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1887 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1888 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1889 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1890 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1891 }; 1892 1893 /** 1894 * Indicates whether the view text direction has been resolved. 1895 * @hide 1896 */ 1897 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1898 1899 /** 1900 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1901 * @hide 1902 */ 1903 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1904 1905 /** 1906 * Mask for use with private flags indicating bits used for resolved text direction. 1907 * @hide 1908 */ 1909 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1910 1911 /** 1912 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1913 * @hide 1914 */ 1915 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1916 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1917 1918 /* 1919 * Default text alignment. The text alignment of this View is inherited from its parent. 1920 * Use with {@link #setTextAlignment(int)} 1921 */ 1922 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1923 1924 /** 1925 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1926 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1927 * 1928 * Use with {@link #setTextAlignment(int)} 1929 */ 1930 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1931 1932 /** 1933 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1934 * 1935 * Use with {@link #setTextAlignment(int)} 1936 */ 1937 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1938 1939 /** 1940 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1941 * 1942 * Use with {@link #setTextAlignment(int)} 1943 */ 1944 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1945 1946 /** 1947 * Center the paragraph, e.g. ALIGN_CENTER. 1948 * 1949 * Use with {@link #setTextAlignment(int)} 1950 */ 1951 public static final int TEXT_ALIGNMENT_CENTER = 4; 1952 1953 /** 1954 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 1955 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 1956 * 1957 * Use with {@link #setTextAlignment(int)} 1958 */ 1959 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 1960 1961 /** 1962 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 1963 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 1964 * 1965 * Use with {@link #setTextAlignment(int)} 1966 */ 1967 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 1968 1969 /** 1970 * Default text alignment is inherited 1971 */ 1972 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 1973 1974 /** 1975 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1976 * @hide 1977 */ 1978 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 1979 1980 /** 1981 * Mask for use with private flags indicating bits used for text alignment. 1982 * @hide 1983 */ 1984 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 1985 1986 /** 1987 * Array of text direction flags for mapping attribute "textAlignment" to correct 1988 * flag value. 1989 * @hide 1990 */ 1991 private static final int[] TEXT_ALIGNMENT_FLAGS = { 1992 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 1993 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 1994 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 1995 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 1996 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 1997 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 1998 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 1999 }; 2000 2001 /** 2002 * Indicates whether the view text alignment has been resolved. 2003 * @hide 2004 */ 2005 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2006 2007 /** 2008 * Bit shift to get the resolved text alignment. 2009 * @hide 2010 */ 2011 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2012 2013 /** 2014 * Mask for use with private flags indicating bits used for text alignment. 2015 * @hide 2016 */ 2017 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2018 2019 /** 2020 * Indicates whether if the view text alignment has been resolved to gravity 2021 */ 2022 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2023 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2024 2025 // Accessiblity constants for mPrivateFlags2 2026 2027 /** 2028 * Shift for the bits in {@link #mPrivateFlags2} related to the 2029 * "importantForAccessibility" attribute. 2030 */ 2031 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2032 2033 /** 2034 * Automatically determine whether a view is important for accessibility. 2035 */ 2036 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2037 2038 /** 2039 * The view is important for accessibility. 2040 */ 2041 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2042 2043 /** 2044 * The view is not important for accessibility. 2045 */ 2046 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2047 2048 /** 2049 * The default whether the view is important for accessiblity. 2050 */ 2051 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2052 2053 /** 2054 * Mask for obtainig the bits which specify how to determine 2055 * whether a view is important for accessibility. 2056 */ 2057 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2058 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2059 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2060 2061 /** 2062 * Flag indicating whether a view has accessibility focus. 2063 */ 2064 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2065 2066 /** 2067 * Flag indicating whether a view state for accessibility has changed. 2068 */ 2069 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2070 2071 /** 2072 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2073 * is used to check whether later changes to the view's transform should invalidate the 2074 * view to force the quickReject test to run again. 2075 */ 2076 static final int VIEW_QUICK_REJECTED = 0x10000000; 2077 2078 // There are a couple of flags left in mPrivateFlags2 2079 2080 /* End of masks for mPrivateFlags2 */ 2081 2082 /* Masks for mPrivateFlags3 */ 2083 2084 /** 2085 * Flag indicating that view has a transform animation set on it. This is used to track whether 2086 * an animation is cleared between successive frames, in order to tell the associated 2087 * DisplayList to clear its animation matrix. 2088 */ 2089 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2090 2091 /** 2092 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2093 * animation is cleared between successive frames, in order to tell the associated 2094 * DisplayList to restore its alpha value. 2095 */ 2096 static final int VIEW_IS_ANIMATING_ALPHA = 0x2; 2097 2098 2099 /* End of masks for mPrivateFlags3 */ 2100 2101 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2102 2103 /** 2104 * Always allow a user to over-scroll this view, provided it is a 2105 * view that can scroll. 2106 * 2107 * @see #getOverScrollMode() 2108 * @see #setOverScrollMode(int) 2109 */ 2110 public static final int OVER_SCROLL_ALWAYS = 0; 2111 2112 /** 2113 * Allow a user to over-scroll this view only if the content is large 2114 * enough to meaningfully scroll, provided it is a view that can scroll. 2115 * 2116 * @see #getOverScrollMode() 2117 * @see #setOverScrollMode(int) 2118 */ 2119 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2120 2121 /** 2122 * Never allow a user to over-scroll this view. 2123 * 2124 * @see #getOverScrollMode() 2125 * @see #setOverScrollMode(int) 2126 */ 2127 public static final int OVER_SCROLL_NEVER = 2; 2128 2129 /** 2130 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2131 * requested the system UI (status bar) to be visible (the default). 2132 * 2133 * @see #setSystemUiVisibility(int) 2134 */ 2135 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2136 2137 /** 2138 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2139 * system UI to enter an unobtrusive "low profile" mode. 2140 * 2141 * <p>This is for use in games, book readers, video players, or any other 2142 * "immersive" application where the usual system chrome is deemed too distracting. 2143 * 2144 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2145 * 2146 * @see #setSystemUiVisibility(int) 2147 */ 2148 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2149 2150 /** 2151 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2152 * system navigation be temporarily hidden. 2153 * 2154 * <p>This is an even less obtrusive state than that called for by 2155 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2156 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2157 * those to disappear. This is useful (in conjunction with the 2158 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2159 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2160 * window flags) for displaying content using every last pixel on the display. 2161 * 2162 * <p>There is a limitation: because navigation controls are so important, the least user 2163 * interaction will cause them to reappear immediately. When this happens, both 2164 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2165 * so that both elements reappear at the same time. 2166 * 2167 * @see #setSystemUiVisibility(int) 2168 */ 2169 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2170 2171 /** 2172 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2173 * into the normal fullscreen mode so that its content can take over the screen 2174 * while still allowing the user to interact with the application. 2175 * 2176 * <p>This has the same visual effect as 2177 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2178 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2179 * meaning that non-critical screen decorations (such as the status bar) will be 2180 * hidden while the user is in the View's window, focusing the experience on 2181 * that content. Unlike the window flag, if you are using ActionBar in 2182 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2183 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2184 * hide the action bar. 2185 * 2186 * <p>This approach to going fullscreen is best used over the window flag when 2187 * it is a transient state -- that is, the application does this at certain 2188 * points in its user interaction where it wants to allow the user to focus 2189 * on content, but not as a continuous state. For situations where the application 2190 * would like to simply stay full screen the entire time (such as a game that 2191 * wants to take over the screen), the 2192 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2193 * is usually a better approach. The state set here will be removed by the system 2194 * in various situations (such as the user moving to another application) like 2195 * the other system UI states. 2196 * 2197 * <p>When using this flag, the application should provide some easy facility 2198 * for the user to go out of it. A common example would be in an e-book 2199 * reader, where tapping on the screen brings back whatever screen and UI 2200 * decorations that had been hidden while the user was immersed in reading 2201 * the book. 2202 * 2203 * @see #setSystemUiVisibility(int) 2204 */ 2205 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2206 2207 /** 2208 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2209 * flags, we would like a stable view of the content insets given to 2210 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2211 * will always represent the worst case that the application can expect 2212 * as a continuous state. In the stock Android UI this is the space for 2213 * the system bar, nav bar, and status bar, but not more transient elements 2214 * such as an input method. 2215 * 2216 * The stable layout your UI sees is based on the system UI modes you can 2217 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2218 * then you will get a stable layout for changes of the 2219 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2220 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2221 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2222 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2223 * with a stable layout. (Note that you should avoid using 2224 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2225 * 2226 * If you have set the window flag {@ WindowManager.LayoutParams#FLAG_FULLSCREEN} 2227 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2228 * then a hidden status bar will be considered a "stable" state for purposes 2229 * here. This allows your UI to continually hide the status bar, while still 2230 * using the system UI flags to hide the action bar while still retaining 2231 * a stable layout. Note that changing the window fullscreen flag will never 2232 * provide a stable layout for a clean transition. 2233 * 2234 * <p>If you are using ActionBar in 2235 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2236 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2237 * insets it adds to those given to the application. 2238 */ 2239 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2240 2241 /** 2242 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2243 * to be layed out as if it has requested 2244 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2245 * allows it to avoid artifacts when switching in and out of that mode, at 2246 * the expense that some of its user interface may be covered by screen 2247 * decorations when they are shown. You can perform layout of your inner 2248 * UI elements to account for the navagation system UI through the 2249 * {@link #fitSystemWindows(Rect)} method. 2250 */ 2251 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2252 2253 /** 2254 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2255 * to be layed out as if it has requested 2256 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2257 * allows it to avoid artifacts when switching in and out of that mode, at 2258 * the expense that some of its user interface may be covered by screen 2259 * decorations when they are shown. You can perform layout of your inner 2260 * UI elements to account for non-fullscreen system UI through the 2261 * {@link #fitSystemWindows(Rect)} method. 2262 */ 2263 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2264 2265 /** 2266 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2267 */ 2268 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2269 2270 /** 2271 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2272 */ 2273 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2274 2275 /** 2276 * @hide 2277 * 2278 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2279 * out of the public fields to keep the undefined bits out of the developer's way. 2280 * 2281 * Flag to make the status bar not expandable. Unless you also 2282 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2283 */ 2284 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2285 2286 /** 2287 * @hide 2288 * 2289 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2290 * out of the public fields to keep the undefined bits out of the developer's way. 2291 * 2292 * Flag to hide notification icons and scrolling ticker text. 2293 */ 2294 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2295 2296 /** 2297 * @hide 2298 * 2299 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2300 * out of the public fields to keep the undefined bits out of the developer's way. 2301 * 2302 * Flag to disable incoming notification alerts. This will not block 2303 * icons, but it will block sound, vibrating and other visual or aural notifications. 2304 */ 2305 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2306 2307 /** 2308 * @hide 2309 * 2310 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2311 * out of the public fields to keep the undefined bits out of the developer's way. 2312 * 2313 * Flag to hide only the scrolling ticker. Note that 2314 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2315 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2316 */ 2317 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2318 2319 /** 2320 * @hide 2321 * 2322 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2323 * out of the public fields to keep the undefined bits out of the developer's way. 2324 * 2325 * Flag to hide the center system info area. 2326 */ 2327 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2328 2329 /** 2330 * @hide 2331 * 2332 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2333 * out of the public fields to keep the undefined bits out of the developer's way. 2334 * 2335 * Flag to hide only the home button. Don't use this 2336 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2337 */ 2338 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2339 2340 /** 2341 * @hide 2342 * 2343 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2344 * out of the public fields to keep the undefined bits out of the developer's way. 2345 * 2346 * Flag to hide only the back button. Don't use this 2347 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2348 */ 2349 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2350 2351 /** 2352 * @hide 2353 * 2354 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2355 * out of the public fields to keep the undefined bits out of the developer's way. 2356 * 2357 * Flag to hide only the clock. You might use this if your activity has 2358 * its own clock making the status bar's clock redundant. 2359 */ 2360 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2361 2362 /** 2363 * @hide 2364 * 2365 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2366 * out of the public fields to keep the undefined bits out of the developer's way. 2367 * 2368 * Flag to hide only the recent apps button. Don't use this 2369 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2370 */ 2371 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2372 2373 /** 2374 * @hide 2375 */ 2376 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2377 2378 /** 2379 * These are the system UI flags that can be cleared by events outside 2380 * of an application. Currently this is just the ability to tap on the 2381 * screen while hiding the navigation bar to have it return. 2382 * @hide 2383 */ 2384 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2385 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2386 | SYSTEM_UI_FLAG_FULLSCREEN; 2387 2388 /** 2389 * Flags that can impact the layout in relation to system UI. 2390 */ 2391 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2392 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2393 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2394 2395 /** 2396 * Find views that render the specified text. 2397 * 2398 * @see #findViewsWithText(ArrayList, CharSequence, int) 2399 */ 2400 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2401 2402 /** 2403 * Find find views that contain the specified content description. 2404 * 2405 * @see #findViewsWithText(ArrayList, CharSequence, int) 2406 */ 2407 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2408 2409 /** 2410 * Find views that contain {@link AccessibilityNodeProvider}. Such 2411 * a View is a root of virtual view hierarchy and may contain the searched 2412 * text. If this flag is set Views with providers are automatically 2413 * added and it is a responsibility of the client to call the APIs of 2414 * the provider to determine whether the virtual tree rooted at this View 2415 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2416 * represeting the virtual views with this text. 2417 * 2418 * @see #findViewsWithText(ArrayList, CharSequence, int) 2419 * 2420 * @hide 2421 */ 2422 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2423 2424 /** 2425 * The undefined cursor position. 2426 */ 2427 private static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2428 2429 /** 2430 * Indicates that the screen has changed state and is now off. 2431 * 2432 * @see #onScreenStateChanged(int) 2433 */ 2434 public static final int SCREEN_STATE_OFF = 0x0; 2435 2436 /** 2437 * Indicates that the screen has changed state and is now on. 2438 * 2439 * @see #onScreenStateChanged(int) 2440 */ 2441 public static final int SCREEN_STATE_ON = 0x1; 2442 2443 /** 2444 * Controls the over-scroll mode for this view. 2445 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2446 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2447 * and {@link #OVER_SCROLL_NEVER}. 2448 */ 2449 private int mOverScrollMode; 2450 2451 /** 2452 * The parent this view is attached to. 2453 * {@hide} 2454 * 2455 * @see #getParent() 2456 */ 2457 protected ViewParent mParent; 2458 2459 /** 2460 * {@hide} 2461 */ 2462 AttachInfo mAttachInfo; 2463 2464 /** 2465 * {@hide} 2466 */ 2467 @ViewDebug.ExportedProperty(flagMapping = { 2468 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2469 name = "FORCE_LAYOUT"), 2470 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2471 name = "LAYOUT_REQUIRED"), 2472 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2473 name = "DRAWING_CACHE_INVALID", outputIf = false), 2474 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2475 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2476 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2477 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2478 }) 2479 int mPrivateFlags; 2480 int mPrivateFlags2; 2481 int mPrivateFlags3; 2482 2483 /** 2484 * This view's request for the visibility of the status bar. 2485 * @hide 2486 */ 2487 @ViewDebug.ExportedProperty(flagMapping = { 2488 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2489 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2490 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2491 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2492 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2493 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2494 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2495 equals = SYSTEM_UI_FLAG_VISIBLE, 2496 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2497 }) 2498 int mSystemUiVisibility; 2499 2500 /** 2501 * Reference count for transient state. 2502 * @see #setHasTransientState(boolean) 2503 */ 2504 int mTransientStateCount = 0; 2505 2506 /** 2507 * Count of how many windows this view has been attached to. 2508 */ 2509 int mWindowAttachCount; 2510 2511 /** 2512 * The layout parameters associated with this view and used by the parent 2513 * {@link android.view.ViewGroup} to determine how this view should be 2514 * laid out. 2515 * {@hide} 2516 */ 2517 protected ViewGroup.LayoutParams mLayoutParams; 2518 2519 /** 2520 * The view flags hold various views states. 2521 * {@hide} 2522 */ 2523 @ViewDebug.ExportedProperty 2524 int mViewFlags; 2525 2526 static class TransformationInfo { 2527 /** 2528 * The transform matrix for the View. This transform is calculated internally 2529 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2530 * is used by default. Do *not* use this variable directly; instead call 2531 * getMatrix(), which will automatically recalculate the matrix if necessary 2532 * to get the correct matrix based on the latest rotation and scale properties. 2533 */ 2534 private final Matrix mMatrix = new Matrix(); 2535 2536 /** 2537 * The transform matrix for the View. This transform is calculated internally 2538 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2539 * is used by default. Do *not* use this variable directly; instead call 2540 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2541 * to get the correct matrix based on the latest rotation and scale properties. 2542 */ 2543 private Matrix mInverseMatrix; 2544 2545 /** 2546 * An internal variable that tracks whether we need to recalculate the 2547 * transform matrix, based on whether the rotation or scaleX/Y properties 2548 * have changed since the matrix was last calculated. 2549 */ 2550 boolean mMatrixDirty = false; 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 private boolean mInverseMatrixDirty = true; 2558 2559 /** 2560 * A 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. This variable 2563 * is only valid after a call to updateMatrix() or to a function that 2564 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2565 */ 2566 private boolean mMatrixIsIdentity = true; 2567 2568 /** 2569 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2570 */ 2571 private Camera mCamera = null; 2572 2573 /** 2574 * This matrix is used when computing the matrix for 3D rotations. 2575 */ 2576 private Matrix matrix3D = null; 2577 2578 /** 2579 * These prev values are used to recalculate a centered pivot point when necessary. The 2580 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2581 * set), so thes values are only used then as well. 2582 */ 2583 private int mPrevWidth = -1; 2584 private int mPrevHeight = -1; 2585 2586 /** 2587 * The degrees rotation around the vertical axis through the pivot point. 2588 */ 2589 @ViewDebug.ExportedProperty 2590 float mRotationY = 0f; 2591 2592 /** 2593 * The degrees rotation around the horizontal axis through the pivot point. 2594 */ 2595 @ViewDebug.ExportedProperty 2596 float mRotationX = 0f; 2597 2598 /** 2599 * The degrees rotation around the pivot point. 2600 */ 2601 @ViewDebug.ExportedProperty 2602 float mRotation = 0f; 2603 2604 /** 2605 * The amount of translation of the object away from its left property (post-layout). 2606 */ 2607 @ViewDebug.ExportedProperty 2608 float mTranslationX = 0f; 2609 2610 /** 2611 * The amount of translation of the object away from its top property (post-layout). 2612 */ 2613 @ViewDebug.ExportedProperty 2614 float mTranslationY = 0f; 2615 2616 /** 2617 * The amount of scale in the x direction around the pivot point. A 2618 * value of 1 means no scaling is applied. 2619 */ 2620 @ViewDebug.ExportedProperty 2621 float mScaleX = 1f; 2622 2623 /** 2624 * The amount of scale in the y direction around the pivot point. A 2625 * value of 1 means no scaling is applied. 2626 */ 2627 @ViewDebug.ExportedProperty 2628 float mScaleY = 1f; 2629 2630 /** 2631 * The x location of the point around which the view is rotated and scaled. 2632 */ 2633 @ViewDebug.ExportedProperty 2634 float mPivotX = 0f; 2635 2636 /** 2637 * The y location of the point around which the view is rotated and scaled. 2638 */ 2639 @ViewDebug.ExportedProperty 2640 float mPivotY = 0f; 2641 2642 /** 2643 * The opacity of the View. This is a value from 0 to 1, where 0 means 2644 * completely transparent and 1 means completely opaque. 2645 */ 2646 @ViewDebug.ExportedProperty 2647 float mAlpha = 1f; 2648 } 2649 2650 TransformationInfo mTransformationInfo; 2651 2652 private boolean mLastIsOpaque; 2653 2654 /** 2655 * Convenience value to check for float values that are close enough to zero to be considered 2656 * zero. 2657 */ 2658 private static final float NONZERO_EPSILON = .001f; 2659 2660 /** 2661 * The distance in pixels from the left edge of this view's parent 2662 * to the left edge of this view. 2663 * {@hide} 2664 */ 2665 @ViewDebug.ExportedProperty(category = "layout") 2666 protected int mLeft; 2667 /** 2668 * The distance in pixels from the left edge of this view's parent 2669 * to the right edge of this view. 2670 * {@hide} 2671 */ 2672 @ViewDebug.ExportedProperty(category = "layout") 2673 protected int mRight; 2674 /** 2675 * The distance in pixels from the top edge of this view's parent 2676 * to the top edge of this view. 2677 * {@hide} 2678 */ 2679 @ViewDebug.ExportedProperty(category = "layout") 2680 protected int mTop; 2681 /** 2682 * The distance in pixels from the top edge of this view's parent 2683 * to the bottom edge of this view. 2684 * {@hide} 2685 */ 2686 @ViewDebug.ExportedProperty(category = "layout") 2687 protected int mBottom; 2688 2689 /** 2690 * The offset, in pixels, by which the content of this view is scrolled 2691 * horizontally. 2692 * {@hide} 2693 */ 2694 @ViewDebug.ExportedProperty(category = "scrolling") 2695 protected int mScrollX; 2696 /** 2697 * The offset, in pixels, by which the content of this view is scrolled 2698 * vertically. 2699 * {@hide} 2700 */ 2701 @ViewDebug.ExportedProperty(category = "scrolling") 2702 protected int mScrollY; 2703 2704 /** 2705 * The left padding in pixels, that is the distance in pixels between the 2706 * left edge of this view and the left edge of its content. 2707 * {@hide} 2708 */ 2709 @ViewDebug.ExportedProperty(category = "padding") 2710 protected int mPaddingLeft; 2711 /** 2712 * The right padding in pixels, that is the distance in pixels between the 2713 * right edge of this view and the right edge of its content. 2714 * {@hide} 2715 */ 2716 @ViewDebug.ExportedProperty(category = "padding") 2717 protected int mPaddingRight; 2718 /** 2719 * The top padding in pixels, that is the distance in pixels between the 2720 * top edge of this view and the top edge of its content. 2721 * {@hide} 2722 */ 2723 @ViewDebug.ExportedProperty(category = "padding") 2724 protected int mPaddingTop; 2725 /** 2726 * The bottom padding in pixels, that is the distance in pixels between the 2727 * bottom edge of this view and the bottom edge of its content. 2728 * {@hide} 2729 */ 2730 @ViewDebug.ExportedProperty(category = "padding") 2731 protected int mPaddingBottom; 2732 2733 /** 2734 * The layout insets in pixels, that is the distance in pixels between the 2735 * visible edges of this view its bounds. 2736 */ 2737 private Insets mLayoutInsets; 2738 2739 /** 2740 * Briefly describes the view and is primarily used for accessibility support. 2741 */ 2742 private CharSequence mContentDescription; 2743 2744 /** 2745 * Cache the paddingRight set by the user to append to the scrollbar's size. 2746 * 2747 * @hide 2748 */ 2749 @ViewDebug.ExportedProperty(category = "padding") 2750 protected int mUserPaddingRight; 2751 2752 /** 2753 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2754 * 2755 * @hide 2756 */ 2757 @ViewDebug.ExportedProperty(category = "padding") 2758 protected int mUserPaddingBottom; 2759 2760 /** 2761 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2762 * 2763 * @hide 2764 */ 2765 @ViewDebug.ExportedProperty(category = "padding") 2766 protected int mUserPaddingLeft; 2767 2768 /** 2769 * Cache if the user padding is relative. 2770 * 2771 */ 2772 @ViewDebug.ExportedProperty(category = "padding") 2773 boolean mUserPaddingRelative; 2774 2775 /** 2776 * Cache the paddingStart set by the user to append to the scrollbar's size. 2777 * 2778 */ 2779 @ViewDebug.ExportedProperty(category = "padding") 2780 int mUserPaddingStart; 2781 2782 /** 2783 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2784 * 2785 */ 2786 @ViewDebug.ExportedProperty(category = "padding") 2787 int mUserPaddingEnd; 2788 2789 /** 2790 * @hide 2791 */ 2792 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2793 /** 2794 * @hide 2795 */ 2796 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2797 2798 private Drawable mBackground; 2799 2800 private int mBackgroundResource; 2801 private boolean mBackgroundSizeChanged; 2802 2803 static class ListenerInfo { 2804 /** 2805 * Listener used to dispatch focus change events. 2806 * This field should be made private, so it is hidden from the SDK. 2807 * {@hide} 2808 */ 2809 protected OnFocusChangeListener mOnFocusChangeListener; 2810 2811 /** 2812 * Listeners for layout change events. 2813 */ 2814 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2815 2816 /** 2817 * Listeners for attach events. 2818 */ 2819 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2820 2821 /** 2822 * Listener used to dispatch click events. 2823 * This field should be made private, so it is hidden from the SDK. 2824 * {@hide} 2825 */ 2826 public OnClickListener mOnClickListener; 2827 2828 /** 2829 * Listener used to dispatch long click events. 2830 * This field should be made private, so it is hidden from the SDK. 2831 * {@hide} 2832 */ 2833 protected OnLongClickListener mOnLongClickListener; 2834 2835 /** 2836 * Listener used to build the context menu. 2837 * This field should be made private, so it is hidden from the SDK. 2838 * {@hide} 2839 */ 2840 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2841 2842 private OnKeyListener mOnKeyListener; 2843 2844 private OnTouchListener mOnTouchListener; 2845 2846 private OnHoverListener mOnHoverListener; 2847 2848 private OnGenericMotionListener mOnGenericMotionListener; 2849 2850 private OnDragListener mOnDragListener; 2851 2852 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2853 } 2854 2855 ListenerInfo mListenerInfo; 2856 2857 /** 2858 * The application environment this view lives in. 2859 * This field should be made private, so it is hidden from the SDK. 2860 * {@hide} 2861 */ 2862 protected Context mContext; 2863 2864 private final Resources mResources; 2865 2866 private ScrollabilityCache mScrollCache; 2867 2868 private int[] mDrawableState = null; 2869 2870 /** 2871 * Set to true when drawing cache is enabled and cannot be created. 2872 * 2873 * @hide 2874 */ 2875 public boolean mCachingFailed; 2876 2877 private Bitmap mDrawingCache; 2878 private Bitmap mUnscaledDrawingCache; 2879 private HardwareLayer mHardwareLayer; 2880 DisplayList mDisplayList; 2881 2882 /** 2883 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2884 * the user may specify which view to go to next. 2885 */ 2886 private int mNextFocusLeftId = View.NO_ID; 2887 2888 /** 2889 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2890 * the user may specify which view to go to next. 2891 */ 2892 private int mNextFocusRightId = View.NO_ID; 2893 2894 /** 2895 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2896 * the user may specify which view to go to next. 2897 */ 2898 private int mNextFocusUpId = View.NO_ID; 2899 2900 /** 2901 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2902 * the user may specify which view to go to next. 2903 */ 2904 private int mNextFocusDownId = View.NO_ID; 2905 2906 /** 2907 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2908 * the user may specify which view to go to next. 2909 */ 2910 int mNextFocusForwardId = View.NO_ID; 2911 2912 private CheckForLongPress mPendingCheckForLongPress; 2913 private CheckForTap mPendingCheckForTap = null; 2914 private PerformClick mPerformClick; 2915 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2916 2917 private UnsetPressedState mUnsetPressedState; 2918 2919 /** 2920 * Whether the long press's action has been invoked. The tap's action is invoked on the 2921 * up event while a long press is invoked as soon as the long press duration is reached, so 2922 * a long press could be performed before the tap is checked, in which case the tap's action 2923 * should not be invoked. 2924 */ 2925 private boolean mHasPerformedLongPress; 2926 2927 /** 2928 * The minimum height of the view. We'll try our best to have the height 2929 * of this view to at least this amount. 2930 */ 2931 @ViewDebug.ExportedProperty(category = "measurement") 2932 private int mMinHeight; 2933 2934 /** 2935 * The minimum width of the view. We'll try our best to have the width 2936 * of this view to at least this amount. 2937 */ 2938 @ViewDebug.ExportedProperty(category = "measurement") 2939 private int mMinWidth; 2940 2941 /** 2942 * The delegate to handle touch events that are physically in this view 2943 * but should be handled by another view. 2944 */ 2945 private TouchDelegate mTouchDelegate = null; 2946 2947 /** 2948 * Solid color to use as a background when creating the drawing cache. Enables 2949 * the cache to use 16 bit bitmaps instead of 32 bit. 2950 */ 2951 private int mDrawingCacheBackgroundColor = 0; 2952 2953 /** 2954 * Special tree observer used when mAttachInfo is null. 2955 */ 2956 private ViewTreeObserver mFloatingTreeObserver; 2957 2958 /** 2959 * Cache the touch slop from the context that created the view. 2960 */ 2961 private int mTouchSlop; 2962 2963 /** 2964 * Object that handles automatic animation of view properties. 2965 */ 2966 private ViewPropertyAnimator mAnimator = null; 2967 2968 /** 2969 * Flag indicating that a drag can cross window boundaries. When 2970 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2971 * with this flag set, all visible applications will be able to participate 2972 * in the drag operation and receive the dragged content. 2973 * 2974 * @hide 2975 */ 2976 public static final int DRAG_FLAG_GLOBAL = 1; 2977 2978 /** 2979 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2980 */ 2981 private float mVerticalScrollFactor; 2982 2983 /** 2984 * Position of the vertical scroll bar. 2985 */ 2986 private int mVerticalScrollbarPosition; 2987 2988 /** 2989 * Position the scroll bar at the default position as determined by the system. 2990 */ 2991 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2992 2993 /** 2994 * Position the scroll bar along the left edge. 2995 */ 2996 public static final int SCROLLBAR_POSITION_LEFT = 1; 2997 2998 /** 2999 * Position the scroll bar along the right edge. 3000 */ 3001 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3002 3003 /** 3004 * Indicates that the view does not have a layer. 3005 * 3006 * @see #getLayerType() 3007 * @see #setLayerType(int, android.graphics.Paint) 3008 * @see #LAYER_TYPE_SOFTWARE 3009 * @see #LAYER_TYPE_HARDWARE 3010 */ 3011 public static final int LAYER_TYPE_NONE = 0; 3012 3013 /** 3014 * <p>Indicates that the view has a software layer. A software layer is backed 3015 * by a bitmap and causes the view to be rendered using Android's software 3016 * rendering pipeline, even if hardware acceleration is enabled.</p> 3017 * 3018 * <p>Software layers have various usages:</p> 3019 * <p>When the application is not using hardware acceleration, a software layer 3020 * is useful to apply a specific color filter and/or blending mode and/or 3021 * translucency to a view and all its children.</p> 3022 * <p>When the application is using hardware acceleration, a software layer 3023 * is useful to render drawing primitives not supported by the hardware 3024 * accelerated pipeline. It can also be used to cache a complex view tree 3025 * into a texture and reduce the complexity of drawing operations. For instance, 3026 * when animating a complex view tree with a translation, a software layer can 3027 * be used to render the view tree only once.</p> 3028 * <p>Software layers should be avoided when the affected view tree updates 3029 * often. Every update will require to re-render the software layer, which can 3030 * potentially be slow (particularly when hardware acceleration is turned on 3031 * since the layer will have to be uploaded into a hardware texture after every 3032 * update.)</p> 3033 * 3034 * @see #getLayerType() 3035 * @see #setLayerType(int, android.graphics.Paint) 3036 * @see #LAYER_TYPE_NONE 3037 * @see #LAYER_TYPE_HARDWARE 3038 */ 3039 public static final int LAYER_TYPE_SOFTWARE = 1; 3040 3041 /** 3042 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3043 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3044 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3045 * rendering pipeline, but only if hardware acceleration is turned on for the 3046 * view hierarchy. When hardware acceleration is turned off, hardware layers 3047 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3048 * 3049 * <p>A hardware layer is useful to apply a specific color filter and/or 3050 * blending mode and/or translucency to a view and all its children.</p> 3051 * <p>A hardware layer can be used to cache a complex view tree into a 3052 * texture and reduce the complexity of drawing operations. For instance, 3053 * when animating a complex view tree with a translation, a hardware layer can 3054 * be used to render the view tree only once.</p> 3055 * <p>A hardware layer can also be used to increase the rendering quality when 3056 * rotation transformations are applied on a view. It can also be used to 3057 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3058 * 3059 * @see #getLayerType() 3060 * @see #setLayerType(int, android.graphics.Paint) 3061 * @see #LAYER_TYPE_NONE 3062 * @see #LAYER_TYPE_SOFTWARE 3063 */ 3064 public static final int LAYER_TYPE_HARDWARE = 2; 3065 3066 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3067 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3068 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3069 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3070 }) 3071 int mLayerType = LAYER_TYPE_NONE; 3072 Paint mLayerPaint; 3073 Rect mLocalDirtyRect; 3074 3075 /** 3076 * Set to true when the view is sending hover accessibility events because it 3077 * is the innermost hovered view. 3078 */ 3079 private boolean mSendingHoverAccessibilityEvents; 3080 3081 /** 3082 * Simple constructor to use when creating a view from code. 3083 * 3084 * @param context The Context the view is running in, through which it can 3085 * access the current theme, resources, etc. 3086 */ 3087 public View(Context context) { 3088 mContext = context; 3089 mResources = context != null ? context.getResources() : null; 3090 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3091 // Set layout and text direction defaults 3092 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3093 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3094 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3095 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3096 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3097 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3098 mUserPaddingStart = -1; 3099 mUserPaddingEnd = -1; 3100 mUserPaddingRelative = false; 3101 } 3102 3103 /** 3104 * Delegate for injecting accessiblity functionality. 3105 */ 3106 AccessibilityDelegate mAccessibilityDelegate; 3107 3108 /** 3109 * Consistency verifier for debugging purposes. 3110 * @hide 3111 */ 3112 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3113 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3114 new InputEventConsistencyVerifier(this, 0) : null; 3115 3116 /** 3117 * Constructor that is called when inflating a view from XML. This is called 3118 * when a view is being constructed from an XML file, supplying attributes 3119 * that were specified in the XML file. This version uses a default style of 3120 * 0, so the only attribute values applied are those in the Context's Theme 3121 * and the given AttributeSet. 3122 * 3123 * <p> 3124 * The method onFinishInflate() will be called after all children have been 3125 * added. 3126 * 3127 * @param context The Context the view is running in, through which it can 3128 * access the current theme, resources, etc. 3129 * @param attrs The attributes of the XML tag that is inflating the view. 3130 * @see #View(Context, AttributeSet, int) 3131 */ 3132 public View(Context context, AttributeSet attrs) { 3133 this(context, attrs, 0); 3134 } 3135 3136 /** 3137 * Perform inflation from XML and apply a class-specific base style. This 3138 * constructor of View allows subclasses to use their own base style when 3139 * they are inflating. For example, a Button class's constructor would call 3140 * this version of the super class constructor and supply 3141 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3142 * the theme's button style to modify all of the base view attributes (in 3143 * particular its background) as well as the Button class's attributes. 3144 * 3145 * @param context The Context the view is running in, through which it can 3146 * access the current theme, resources, etc. 3147 * @param attrs The attributes of the XML tag that is inflating the view. 3148 * @param defStyle The default style to apply to this view. If 0, no style 3149 * will be applied (beyond what is included in the theme). This may 3150 * either be an attribute resource, whose value will be retrieved 3151 * from the current theme, or an explicit style resource. 3152 * @see #View(Context, AttributeSet) 3153 */ 3154 public View(Context context, AttributeSet attrs, int defStyle) { 3155 this(context); 3156 3157 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3158 defStyle, 0); 3159 3160 Drawable background = null; 3161 3162 int leftPadding = -1; 3163 int topPadding = -1; 3164 int rightPadding = -1; 3165 int bottomPadding = -1; 3166 int startPadding = -1; 3167 int endPadding = -1; 3168 3169 int padding = -1; 3170 3171 int viewFlagValues = 0; 3172 int viewFlagMasks = 0; 3173 3174 boolean setScrollContainer = false; 3175 3176 int x = 0; 3177 int y = 0; 3178 3179 float tx = 0; 3180 float ty = 0; 3181 float rotation = 0; 3182 float rotationX = 0; 3183 float rotationY = 0; 3184 float sx = 1f; 3185 float sy = 1f; 3186 boolean transformSet = false; 3187 3188 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3189 3190 int overScrollMode = mOverScrollMode; 3191 final int N = a.getIndexCount(); 3192 for (int i = 0; i < N; i++) { 3193 int attr = a.getIndex(i); 3194 switch (attr) { 3195 case com.android.internal.R.styleable.View_background: 3196 background = a.getDrawable(attr); 3197 break; 3198 case com.android.internal.R.styleable.View_padding: 3199 padding = a.getDimensionPixelSize(attr, -1); 3200 break; 3201 case com.android.internal.R.styleable.View_paddingLeft: 3202 leftPadding = a.getDimensionPixelSize(attr, -1); 3203 break; 3204 case com.android.internal.R.styleable.View_paddingTop: 3205 topPadding = a.getDimensionPixelSize(attr, -1); 3206 break; 3207 case com.android.internal.R.styleable.View_paddingRight: 3208 rightPadding = a.getDimensionPixelSize(attr, -1); 3209 break; 3210 case com.android.internal.R.styleable.View_paddingBottom: 3211 bottomPadding = a.getDimensionPixelSize(attr, -1); 3212 break; 3213 case com.android.internal.R.styleable.View_paddingStart: 3214 startPadding = a.getDimensionPixelSize(attr, -1); 3215 break; 3216 case com.android.internal.R.styleable.View_paddingEnd: 3217 endPadding = a.getDimensionPixelSize(attr, -1); 3218 break; 3219 case com.android.internal.R.styleable.View_scrollX: 3220 x = a.getDimensionPixelOffset(attr, 0); 3221 break; 3222 case com.android.internal.R.styleable.View_scrollY: 3223 y = a.getDimensionPixelOffset(attr, 0); 3224 break; 3225 case com.android.internal.R.styleable.View_alpha: 3226 setAlpha(a.getFloat(attr, 1f)); 3227 break; 3228 case com.android.internal.R.styleable.View_transformPivotX: 3229 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3230 break; 3231 case com.android.internal.R.styleable.View_transformPivotY: 3232 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3233 break; 3234 case com.android.internal.R.styleable.View_translationX: 3235 tx = a.getDimensionPixelOffset(attr, 0); 3236 transformSet = true; 3237 break; 3238 case com.android.internal.R.styleable.View_translationY: 3239 ty = a.getDimensionPixelOffset(attr, 0); 3240 transformSet = true; 3241 break; 3242 case com.android.internal.R.styleable.View_rotation: 3243 rotation = a.getFloat(attr, 0); 3244 transformSet = true; 3245 break; 3246 case com.android.internal.R.styleable.View_rotationX: 3247 rotationX = a.getFloat(attr, 0); 3248 transformSet = true; 3249 break; 3250 case com.android.internal.R.styleable.View_rotationY: 3251 rotationY = a.getFloat(attr, 0); 3252 transformSet = true; 3253 break; 3254 case com.android.internal.R.styleable.View_scaleX: 3255 sx = a.getFloat(attr, 1f); 3256 transformSet = true; 3257 break; 3258 case com.android.internal.R.styleable.View_scaleY: 3259 sy = a.getFloat(attr, 1f); 3260 transformSet = true; 3261 break; 3262 case com.android.internal.R.styleable.View_id: 3263 mID = a.getResourceId(attr, NO_ID); 3264 break; 3265 case com.android.internal.R.styleable.View_tag: 3266 mTag = a.getText(attr); 3267 break; 3268 case com.android.internal.R.styleable.View_fitsSystemWindows: 3269 if (a.getBoolean(attr, false)) { 3270 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3271 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3272 } 3273 break; 3274 case com.android.internal.R.styleable.View_focusable: 3275 if (a.getBoolean(attr, false)) { 3276 viewFlagValues |= FOCUSABLE; 3277 viewFlagMasks |= FOCUSABLE_MASK; 3278 } 3279 break; 3280 case com.android.internal.R.styleable.View_focusableInTouchMode: 3281 if (a.getBoolean(attr, false)) { 3282 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3283 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3284 } 3285 break; 3286 case com.android.internal.R.styleable.View_clickable: 3287 if (a.getBoolean(attr, false)) { 3288 viewFlagValues |= CLICKABLE; 3289 viewFlagMasks |= CLICKABLE; 3290 } 3291 break; 3292 case com.android.internal.R.styleable.View_longClickable: 3293 if (a.getBoolean(attr, false)) { 3294 viewFlagValues |= LONG_CLICKABLE; 3295 viewFlagMasks |= LONG_CLICKABLE; 3296 } 3297 break; 3298 case com.android.internal.R.styleable.View_saveEnabled: 3299 if (!a.getBoolean(attr, true)) { 3300 viewFlagValues |= SAVE_DISABLED; 3301 viewFlagMasks |= SAVE_DISABLED_MASK; 3302 } 3303 break; 3304 case com.android.internal.R.styleable.View_duplicateParentState: 3305 if (a.getBoolean(attr, false)) { 3306 viewFlagValues |= DUPLICATE_PARENT_STATE; 3307 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3308 } 3309 break; 3310 case com.android.internal.R.styleable.View_visibility: 3311 final int visibility = a.getInt(attr, 0); 3312 if (visibility != 0) { 3313 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3314 viewFlagMasks |= VISIBILITY_MASK; 3315 } 3316 break; 3317 case com.android.internal.R.styleable.View_layoutDirection: 3318 // Clear any layout direction flags (included resolved bits) already set 3319 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3320 // Set the layout direction flags depending on the value of the attribute 3321 final int layoutDirection = a.getInt(attr, -1); 3322 final int value = (layoutDirection != -1) ? 3323 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3324 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3325 break; 3326 case com.android.internal.R.styleable.View_drawingCacheQuality: 3327 final int cacheQuality = a.getInt(attr, 0); 3328 if (cacheQuality != 0) { 3329 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3330 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3331 } 3332 break; 3333 case com.android.internal.R.styleable.View_contentDescription: 3334 setContentDescription(a.getString(attr)); 3335 break; 3336 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3337 if (!a.getBoolean(attr, true)) { 3338 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3339 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3340 } 3341 break; 3342 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3343 if (!a.getBoolean(attr, true)) { 3344 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3345 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3346 } 3347 break; 3348 case R.styleable.View_scrollbars: 3349 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3350 if (scrollbars != SCROLLBARS_NONE) { 3351 viewFlagValues |= scrollbars; 3352 viewFlagMasks |= SCROLLBARS_MASK; 3353 initializeScrollbars(a); 3354 } 3355 break; 3356 //noinspection deprecation 3357 case R.styleable.View_fadingEdge: 3358 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3359 // Ignore the attribute starting with ICS 3360 break; 3361 } 3362 // With builds < ICS, fall through and apply fading edges 3363 case R.styleable.View_requiresFadingEdge: 3364 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3365 if (fadingEdge != FADING_EDGE_NONE) { 3366 viewFlagValues |= fadingEdge; 3367 viewFlagMasks |= FADING_EDGE_MASK; 3368 initializeFadingEdge(a); 3369 } 3370 break; 3371 case R.styleable.View_scrollbarStyle: 3372 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3373 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3374 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3375 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3376 } 3377 break; 3378 case R.styleable.View_isScrollContainer: 3379 setScrollContainer = true; 3380 if (a.getBoolean(attr, false)) { 3381 setScrollContainer(true); 3382 } 3383 break; 3384 case com.android.internal.R.styleable.View_keepScreenOn: 3385 if (a.getBoolean(attr, false)) { 3386 viewFlagValues |= KEEP_SCREEN_ON; 3387 viewFlagMasks |= KEEP_SCREEN_ON; 3388 } 3389 break; 3390 case R.styleable.View_filterTouchesWhenObscured: 3391 if (a.getBoolean(attr, false)) { 3392 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3393 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3394 } 3395 break; 3396 case R.styleable.View_nextFocusLeft: 3397 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3398 break; 3399 case R.styleable.View_nextFocusRight: 3400 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3401 break; 3402 case R.styleable.View_nextFocusUp: 3403 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3404 break; 3405 case R.styleable.View_nextFocusDown: 3406 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3407 break; 3408 case R.styleable.View_nextFocusForward: 3409 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3410 break; 3411 case R.styleable.View_minWidth: 3412 mMinWidth = a.getDimensionPixelSize(attr, 0); 3413 break; 3414 case R.styleable.View_minHeight: 3415 mMinHeight = a.getDimensionPixelSize(attr, 0); 3416 break; 3417 case R.styleable.View_onClick: 3418 if (context.isRestricted()) { 3419 throw new IllegalStateException("The android:onClick attribute cannot " 3420 + "be used within a restricted context"); 3421 } 3422 3423 final String handlerName = a.getString(attr); 3424 if (handlerName != null) { 3425 setOnClickListener(new OnClickListener() { 3426 private Method mHandler; 3427 3428 public void onClick(View v) { 3429 if (mHandler == null) { 3430 try { 3431 mHandler = getContext().getClass().getMethod(handlerName, 3432 View.class); 3433 } catch (NoSuchMethodException e) { 3434 int id = getId(); 3435 String idText = id == NO_ID ? "" : " with id '" 3436 + getContext().getResources().getResourceEntryName( 3437 id) + "'"; 3438 throw new IllegalStateException("Could not find a method " + 3439 handlerName + "(View) in the activity " 3440 + getContext().getClass() + " for onClick handler" 3441 + " on view " + View.this.getClass() + idText, e); 3442 } 3443 } 3444 3445 try { 3446 mHandler.invoke(getContext(), View.this); 3447 } catch (IllegalAccessException e) { 3448 throw new IllegalStateException("Could not execute non " 3449 + "public method of the activity", e); 3450 } catch (InvocationTargetException e) { 3451 throw new IllegalStateException("Could not execute " 3452 + "method of the activity", e); 3453 } 3454 } 3455 }); 3456 } 3457 break; 3458 case R.styleable.View_overScrollMode: 3459 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3460 break; 3461 case R.styleable.View_verticalScrollbarPosition: 3462 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3463 break; 3464 case R.styleable.View_layerType: 3465 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3466 break; 3467 case R.styleable.View_textDirection: 3468 // Clear any text direction flag already set 3469 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3470 // Set the text direction flags depending on the value of the attribute 3471 final int textDirection = a.getInt(attr, -1); 3472 if (textDirection != -1) { 3473 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3474 } 3475 break; 3476 case R.styleable.View_textAlignment: 3477 // Clear any text alignment flag already set 3478 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3479 // Set the text alignment flag depending on the value of the attribute 3480 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3481 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3482 break; 3483 case R.styleable.View_importantForAccessibility: 3484 setImportantForAccessibility(a.getInt(attr, 3485 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3486 break; 3487 } 3488 } 3489 3490 a.recycle(); 3491 3492 setOverScrollMode(overScrollMode); 3493 3494 if (background != null) { 3495 setBackground(background); 3496 } 3497 3498 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3499 // layout direction). Those cached values will be used later during padding resolution. 3500 mUserPaddingStart = startPadding; 3501 mUserPaddingEnd = endPadding; 3502 3503 updateUserPaddingRelative(); 3504 3505 if (padding >= 0) { 3506 leftPadding = padding; 3507 topPadding = padding; 3508 rightPadding = padding; 3509 bottomPadding = padding; 3510 } 3511 3512 // If the user specified the padding (either with android:padding or 3513 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3514 // use the default padding or the padding from the background drawable 3515 // (stored at this point in mPadding*) 3516 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3517 topPadding >= 0 ? topPadding : mPaddingTop, 3518 rightPadding >= 0 ? rightPadding : mPaddingRight, 3519 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3520 3521 if (viewFlagMasks != 0) { 3522 setFlags(viewFlagValues, viewFlagMasks); 3523 } 3524 3525 // Needs to be called after mViewFlags is set 3526 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3527 recomputePadding(); 3528 } 3529 3530 if (x != 0 || y != 0) { 3531 scrollTo(x, y); 3532 } 3533 3534 if (transformSet) { 3535 setTranslationX(tx); 3536 setTranslationY(ty); 3537 setRotation(rotation); 3538 setRotationX(rotationX); 3539 setRotationY(rotationY); 3540 setScaleX(sx); 3541 setScaleY(sy); 3542 } 3543 3544 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3545 setScrollContainer(true); 3546 } 3547 3548 computeOpaqueFlags(); 3549 } 3550 3551 private void updateUserPaddingRelative() { 3552 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3553 } 3554 3555 /** 3556 * Non-public constructor for use in testing 3557 */ 3558 View() { 3559 mResources = null; 3560 } 3561 3562 /** 3563 * <p> 3564 * Initializes the fading edges from a given set of styled attributes. This 3565 * method should be called by subclasses that need fading edges and when an 3566 * instance of these subclasses is created programmatically rather than 3567 * being inflated from XML. This method is automatically called when the XML 3568 * is inflated. 3569 * </p> 3570 * 3571 * @param a the styled attributes set to initialize the fading edges from 3572 */ 3573 protected void initializeFadingEdge(TypedArray a) { 3574 initScrollCache(); 3575 3576 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3577 R.styleable.View_fadingEdgeLength, 3578 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3579 } 3580 3581 /** 3582 * Returns the size of the vertical faded edges used to indicate that more 3583 * content in this view is visible. 3584 * 3585 * @return The size in pixels of the vertical faded edge or 0 if vertical 3586 * faded edges are not enabled for this view. 3587 * @attr ref android.R.styleable#View_fadingEdgeLength 3588 */ 3589 public int getVerticalFadingEdgeLength() { 3590 if (isVerticalFadingEdgeEnabled()) { 3591 ScrollabilityCache cache = mScrollCache; 3592 if (cache != null) { 3593 return cache.fadingEdgeLength; 3594 } 3595 } 3596 return 0; 3597 } 3598 3599 /** 3600 * Set the size of the faded edge used to indicate that more content in this 3601 * view is available. Will not change whether the fading edge is enabled; use 3602 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3603 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3604 * for the vertical or horizontal fading edges. 3605 * 3606 * @param length The size in pixels of the faded edge used to indicate that more 3607 * content in this view is visible. 3608 */ 3609 public void setFadingEdgeLength(int length) { 3610 initScrollCache(); 3611 mScrollCache.fadingEdgeLength = length; 3612 } 3613 3614 /** 3615 * Returns the size of the horizontal faded edges used to indicate that more 3616 * content in this view is visible. 3617 * 3618 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3619 * faded edges are not enabled for this view. 3620 * @attr ref android.R.styleable#View_fadingEdgeLength 3621 */ 3622 public int getHorizontalFadingEdgeLength() { 3623 if (isHorizontalFadingEdgeEnabled()) { 3624 ScrollabilityCache cache = mScrollCache; 3625 if (cache != null) { 3626 return cache.fadingEdgeLength; 3627 } 3628 } 3629 return 0; 3630 } 3631 3632 /** 3633 * Returns the width of the vertical scrollbar. 3634 * 3635 * @return The width in pixels of the vertical scrollbar or 0 if there 3636 * is no vertical scrollbar. 3637 */ 3638 public int getVerticalScrollbarWidth() { 3639 ScrollabilityCache cache = mScrollCache; 3640 if (cache != null) { 3641 ScrollBarDrawable scrollBar = cache.scrollBar; 3642 if (scrollBar != null) { 3643 int size = scrollBar.getSize(true); 3644 if (size <= 0) { 3645 size = cache.scrollBarSize; 3646 } 3647 return size; 3648 } 3649 return 0; 3650 } 3651 return 0; 3652 } 3653 3654 /** 3655 * Returns the height of the horizontal scrollbar. 3656 * 3657 * @return The height in pixels of the horizontal scrollbar or 0 if 3658 * there is no horizontal scrollbar. 3659 */ 3660 protected int getHorizontalScrollbarHeight() { 3661 ScrollabilityCache cache = mScrollCache; 3662 if (cache != null) { 3663 ScrollBarDrawable scrollBar = cache.scrollBar; 3664 if (scrollBar != null) { 3665 int size = scrollBar.getSize(false); 3666 if (size <= 0) { 3667 size = cache.scrollBarSize; 3668 } 3669 return size; 3670 } 3671 return 0; 3672 } 3673 return 0; 3674 } 3675 3676 /** 3677 * <p> 3678 * Initializes the scrollbars from a given set of styled attributes. This 3679 * method should be called by subclasses that need scrollbars and when an 3680 * instance of these subclasses is created programmatically rather than 3681 * being inflated from XML. This method is automatically called when the XML 3682 * is inflated. 3683 * </p> 3684 * 3685 * @param a the styled attributes set to initialize the scrollbars from 3686 */ 3687 protected void initializeScrollbars(TypedArray a) { 3688 initScrollCache(); 3689 3690 final ScrollabilityCache scrollabilityCache = mScrollCache; 3691 3692 if (scrollabilityCache.scrollBar == null) { 3693 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3694 } 3695 3696 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3697 3698 if (!fadeScrollbars) { 3699 scrollabilityCache.state = ScrollabilityCache.ON; 3700 } 3701 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3702 3703 3704 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3705 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3706 .getScrollBarFadeDuration()); 3707 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3708 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3709 ViewConfiguration.getScrollDefaultDelay()); 3710 3711 3712 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3713 com.android.internal.R.styleable.View_scrollbarSize, 3714 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3715 3716 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3717 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3718 3719 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3720 if (thumb != null) { 3721 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3722 } 3723 3724 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3725 false); 3726 if (alwaysDraw) { 3727 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3728 } 3729 3730 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3731 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3732 3733 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3734 if (thumb != null) { 3735 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3736 } 3737 3738 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3739 false); 3740 if (alwaysDraw) { 3741 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3742 } 3743 3744 // Apply layout direction to the new Drawables if needed 3745 final int layoutDirection = getResolvedLayoutDirection(); 3746 if (track != null) { 3747 track.setLayoutDirection(layoutDirection); 3748 } 3749 if (thumb != null) { 3750 thumb.setLayoutDirection(layoutDirection); 3751 } 3752 3753 // Re-apply user/background padding so that scrollbar(s) get added 3754 resolvePadding(); 3755 } 3756 3757 /** 3758 * <p> 3759 * Initalizes the scrollability cache if necessary. 3760 * </p> 3761 */ 3762 private void initScrollCache() { 3763 if (mScrollCache == null) { 3764 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3765 } 3766 } 3767 3768 private ScrollabilityCache getScrollCache() { 3769 initScrollCache(); 3770 return mScrollCache; 3771 } 3772 3773 /** 3774 * Set the position of the vertical scroll bar. Should be one of 3775 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3776 * {@link #SCROLLBAR_POSITION_RIGHT}. 3777 * 3778 * @param position Where the vertical scroll bar should be positioned. 3779 */ 3780 public void setVerticalScrollbarPosition(int position) { 3781 if (mVerticalScrollbarPosition != position) { 3782 mVerticalScrollbarPosition = position; 3783 computeOpaqueFlags(); 3784 resolvePadding(); 3785 } 3786 } 3787 3788 /** 3789 * @return The position where the vertical scroll bar will show, if applicable. 3790 * @see #setVerticalScrollbarPosition(int) 3791 */ 3792 public int getVerticalScrollbarPosition() { 3793 return mVerticalScrollbarPosition; 3794 } 3795 3796 ListenerInfo getListenerInfo() { 3797 if (mListenerInfo != null) { 3798 return mListenerInfo; 3799 } 3800 mListenerInfo = new ListenerInfo(); 3801 return mListenerInfo; 3802 } 3803 3804 /** 3805 * Register a callback to be invoked when focus of this view changed. 3806 * 3807 * @param l The callback that will run. 3808 */ 3809 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3810 getListenerInfo().mOnFocusChangeListener = l; 3811 } 3812 3813 /** 3814 * Add a listener that will be called when the bounds of the view change due to 3815 * layout processing. 3816 * 3817 * @param listener The listener that will be called when layout bounds change. 3818 */ 3819 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3820 ListenerInfo li = getListenerInfo(); 3821 if (li.mOnLayoutChangeListeners == null) { 3822 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3823 } 3824 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3825 li.mOnLayoutChangeListeners.add(listener); 3826 } 3827 } 3828 3829 /** 3830 * Remove a listener for layout changes. 3831 * 3832 * @param listener The listener for layout bounds change. 3833 */ 3834 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3835 ListenerInfo li = mListenerInfo; 3836 if (li == null || li.mOnLayoutChangeListeners == null) { 3837 return; 3838 } 3839 li.mOnLayoutChangeListeners.remove(listener); 3840 } 3841 3842 /** 3843 * Add a listener for attach state changes. 3844 * 3845 * This listener will be called whenever this view is attached or detached 3846 * from a window. Remove the listener using 3847 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3848 * 3849 * @param listener Listener to attach 3850 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3851 */ 3852 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3853 ListenerInfo li = getListenerInfo(); 3854 if (li.mOnAttachStateChangeListeners == null) { 3855 li.mOnAttachStateChangeListeners 3856 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3857 } 3858 li.mOnAttachStateChangeListeners.add(listener); 3859 } 3860 3861 /** 3862 * Remove a listener for attach state changes. The listener will receive no further 3863 * notification of window attach/detach events. 3864 * 3865 * @param listener Listener to remove 3866 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3867 */ 3868 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3869 ListenerInfo li = mListenerInfo; 3870 if (li == null || li.mOnAttachStateChangeListeners == null) { 3871 return; 3872 } 3873 li.mOnAttachStateChangeListeners.remove(listener); 3874 } 3875 3876 /** 3877 * Returns the focus-change callback registered for this view. 3878 * 3879 * @return The callback, or null if one is not registered. 3880 */ 3881 public OnFocusChangeListener getOnFocusChangeListener() { 3882 ListenerInfo li = mListenerInfo; 3883 return li != null ? li.mOnFocusChangeListener : null; 3884 } 3885 3886 /** 3887 * Register a callback to be invoked when this view is clicked. If this view is not 3888 * clickable, it becomes clickable. 3889 * 3890 * @param l The callback that will run 3891 * 3892 * @see #setClickable(boolean) 3893 */ 3894 public void setOnClickListener(OnClickListener l) { 3895 if (!isClickable()) { 3896 setClickable(true); 3897 } 3898 getListenerInfo().mOnClickListener = l; 3899 } 3900 3901 /** 3902 * Return whether this view has an attached OnClickListener. Returns 3903 * true if there is a listener, false if there is none. 3904 */ 3905 public boolean hasOnClickListeners() { 3906 ListenerInfo li = mListenerInfo; 3907 return (li != null && li.mOnClickListener != null); 3908 } 3909 3910 /** 3911 * Register a callback to be invoked when this view is clicked and held. If this view is not 3912 * long clickable, it becomes long clickable. 3913 * 3914 * @param l The callback that will run 3915 * 3916 * @see #setLongClickable(boolean) 3917 */ 3918 public void setOnLongClickListener(OnLongClickListener l) { 3919 if (!isLongClickable()) { 3920 setLongClickable(true); 3921 } 3922 getListenerInfo().mOnLongClickListener = l; 3923 } 3924 3925 /** 3926 * Register a callback to be invoked when the context menu for this view is 3927 * being built. If this view is not long clickable, it becomes long clickable. 3928 * 3929 * @param l The callback that will run 3930 * 3931 */ 3932 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3933 if (!isLongClickable()) { 3934 setLongClickable(true); 3935 } 3936 getListenerInfo().mOnCreateContextMenuListener = l; 3937 } 3938 3939 /** 3940 * Call this view's OnClickListener, if it is defined. Performs all normal 3941 * actions associated with clicking: reporting accessibility event, playing 3942 * a sound, etc. 3943 * 3944 * @return True there was an assigned OnClickListener that was called, false 3945 * otherwise is returned. 3946 */ 3947 public boolean performClick() { 3948 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3949 3950 ListenerInfo li = mListenerInfo; 3951 if (li != null && li.mOnClickListener != null) { 3952 playSoundEffect(SoundEffectConstants.CLICK); 3953 li.mOnClickListener.onClick(this); 3954 return true; 3955 } 3956 3957 return false; 3958 } 3959 3960 /** 3961 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3962 * this only calls the listener, and does not do any associated clicking 3963 * actions like reporting an accessibility event. 3964 * 3965 * @return True there was an assigned OnClickListener that was called, false 3966 * otherwise is returned. 3967 */ 3968 public boolean callOnClick() { 3969 ListenerInfo li = mListenerInfo; 3970 if (li != null && li.mOnClickListener != null) { 3971 li.mOnClickListener.onClick(this); 3972 return true; 3973 } 3974 return false; 3975 } 3976 3977 /** 3978 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3979 * OnLongClickListener did not consume the event. 3980 * 3981 * @return True if one of the above receivers consumed the event, false otherwise. 3982 */ 3983 public boolean performLongClick() { 3984 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3985 3986 boolean handled = false; 3987 ListenerInfo li = mListenerInfo; 3988 if (li != null && li.mOnLongClickListener != null) { 3989 handled = li.mOnLongClickListener.onLongClick(View.this); 3990 } 3991 if (!handled) { 3992 handled = showContextMenu(); 3993 } 3994 if (handled) { 3995 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3996 } 3997 return handled; 3998 } 3999 4000 /** 4001 * Performs button-related actions during a touch down event. 4002 * 4003 * @param event The event. 4004 * @return True if the down was consumed. 4005 * 4006 * @hide 4007 */ 4008 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4009 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4010 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4011 return true; 4012 } 4013 } 4014 return false; 4015 } 4016 4017 /** 4018 * Bring up the context menu for this view. 4019 * 4020 * @return Whether a context menu was displayed. 4021 */ 4022 public boolean showContextMenu() { 4023 return getParent().showContextMenuForChild(this); 4024 } 4025 4026 /** 4027 * Bring up the context menu for this view, referring to the item under the specified point. 4028 * 4029 * @param x The referenced x coordinate. 4030 * @param y The referenced y coordinate. 4031 * @param metaState The keyboard modifiers that were pressed. 4032 * @return Whether a context menu was displayed. 4033 * 4034 * @hide 4035 */ 4036 public boolean showContextMenu(float x, float y, int metaState) { 4037 return showContextMenu(); 4038 } 4039 4040 /** 4041 * Start an action mode. 4042 * 4043 * @param callback Callback that will control the lifecycle of the action mode 4044 * @return The new action mode if it is started, null otherwise 4045 * 4046 * @see ActionMode 4047 */ 4048 public ActionMode startActionMode(ActionMode.Callback callback) { 4049 ViewParent parent = getParent(); 4050 if (parent == null) return null; 4051 return parent.startActionModeForChild(this, callback); 4052 } 4053 4054 /** 4055 * Register a callback to be invoked when a hardware key is pressed in this view. 4056 * Key presses in software input methods will generally not trigger the methods of 4057 * this listener. 4058 * @param l the key listener to attach to this view 4059 */ 4060 public void setOnKeyListener(OnKeyListener l) { 4061 getListenerInfo().mOnKeyListener = l; 4062 } 4063 4064 /** 4065 * Register a callback to be invoked when a touch event is sent to this view. 4066 * @param l the touch listener to attach to this view 4067 */ 4068 public void setOnTouchListener(OnTouchListener l) { 4069 getListenerInfo().mOnTouchListener = l; 4070 } 4071 4072 /** 4073 * Register a callback to be invoked when a generic motion event is sent to this view. 4074 * @param l the generic motion listener to attach to this view 4075 */ 4076 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4077 getListenerInfo().mOnGenericMotionListener = l; 4078 } 4079 4080 /** 4081 * Register a callback to be invoked when a hover event is sent to this view. 4082 * @param l the hover listener to attach to this view 4083 */ 4084 public void setOnHoverListener(OnHoverListener l) { 4085 getListenerInfo().mOnHoverListener = l; 4086 } 4087 4088 /** 4089 * Register a drag event listener callback object for this View. The parameter is 4090 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4091 * View, the system calls the 4092 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4093 * @param l An implementation of {@link android.view.View.OnDragListener}. 4094 */ 4095 public void setOnDragListener(OnDragListener l) { 4096 getListenerInfo().mOnDragListener = l; 4097 } 4098 4099 /** 4100 * Give this view focus. This will cause 4101 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4102 * 4103 * Note: this does not check whether this {@link View} should get focus, it just 4104 * gives it focus no matter what. It should only be called internally by framework 4105 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4106 * 4107 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4108 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4109 * focus moved when requestFocus() is called. It may not always 4110 * apply, in which case use the default View.FOCUS_DOWN. 4111 * @param previouslyFocusedRect The rectangle of the view that had focus 4112 * prior in this View's coordinate system. 4113 */ 4114 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4115 if (DBG) { 4116 System.out.println(this + " requestFocus()"); 4117 } 4118 4119 if ((mPrivateFlags & FOCUSED) == 0) { 4120 mPrivateFlags |= FOCUSED; 4121 4122 if (mParent != null) { 4123 mParent.requestChildFocus(this, this); 4124 } 4125 4126 onFocusChanged(true, direction, previouslyFocusedRect); 4127 refreshDrawableState(); 4128 4129 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4130 notifyAccessibilityStateChanged(); 4131 } 4132 } 4133 } 4134 4135 /** 4136 * Request that a rectangle of this view be visible on the screen, 4137 * scrolling if necessary just enough. 4138 * 4139 * <p>A View should call this if it maintains some notion of which part 4140 * of its content is interesting. For example, a text editing view 4141 * should call this when its cursor moves. 4142 * 4143 * @param rectangle The rectangle. 4144 * @return Whether any parent scrolled. 4145 */ 4146 public boolean requestRectangleOnScreen(Rect rectangle) { 4147 return requestRectangleOnScreen(rectangle, false); 4148 } 4149 4150 /** 4151 * Request that a rectangle of this view be visible on the screen, 4152 * scrolling if necessary just enough. 4153 * 4154 * <p>A View should call this if it maintains some notion of which part 4155 * of its content is interesting. For example, a text editing view 4156 * should call this when its cursor moves. 4157 * 4158 * <p>When <code>immediate</code> is set to true, scrolling will not be 4159 * animated. 4160 * 4161 * @param rectangle The rectangle. 4162 * @param immediate True to forbid animated scrolling, false otherwise 4163 * @return Whether any parent scrolled. 4164 */ 4165 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4166 View child = this; 4167 ViewParent parent = mParent; 4168 boolean scrolled = false; 4169 while (parent != null) { 4170 scrolled |= parent.requestChildRectangleOnScreen(child, 4171 rectangle, immediate); 4172 4173 // offset rect so next call has the rectangle in the 4174 // coordinate system of its direct child. 4175 rectangle.offset(child.getLeft(), child.getTop()); 4176 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4177 4178 if (!(parent instanceof View)) { 4179 break; 4180 } 4181 4182 child = (View) parent; 4183 parent = child.getParent(); 4184 } 4185 return scrolled; 4186 } 4187 4188 /** 4189 * Called when this view wants to give up focus. If focus is cleared 4190 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4191 * <p> 4192 * <strong>Note:</strong> When a View clears focus the framework is trying 4193 * to give focus to the first focusable View from the top. Hence, if this 4194 * View is the first from the top that can take focus, then all callbacks 4195 * related to clearing focus will be invoked after wich the framework will 4196 * give focus to this view. 4197 * </p> 4198 */ 4199 public void clearFocus() { 4200 if (DBG) { 4201 System.out.println(this + " clearFocus()"); 4202 } 4203 4204 if ((mPrivateFlags & FOCUSED) != 0) { 4205 mPrivateFlags &= ~FOCUSED; 4206 4207 if (mParent != null) { 4208 mParent.clearChildFocus(this); 4209 } 4210 4211 onFocusChanged(false, 0, null); 4212 4213 refreshDrawableState(); 4214 4215 ensureInputFocusOnFirstFocusable(); 4216 4217 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4218 notifyAccessibilityStateChanged(); 4219 } 4220 } 4221 } 4222 4223 void ensureInputFocusOnFirstFocusable() { 4224 View root = getRootView(); 4225 if (root != null) { 4226 root.requestFocus(); 4227 } 4228 } 4229 4230 /** 4231 * Called internally by the view system when a new view is getting focus. 4232 * This is what clears the old focus. 4233 */ 4234 void unFocus() { 4235 if (DBG) { 4236 System.out.println(this + " unFocus()"); 4237 } 4238 4239 if ((mPrivateFlags & FOCUSED) != 0) { 4240 mPrivateFlags &= ~FOCUSED; 4241 4242 onFocusChanged(false, 0, null); 4243 refreshDrawableState(); 4244 4245 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4246 notifyAccessibilityStateChanged(); 4247 } 4248 } 4249 } 4250 4251 /** 4252 * Returns true if this view has focus iteself, or is the ancestor of the 4253 * view that has focus. 4254 * 4255 * @return True if this view has or contains focus, false otherwise. 4256 */ 4257 @ViewDebug.ExportedProperty(category = "focus") 4258 public boolean hasFocus() { 4259 return (mPrivateFlags & FOCUSED) != 0; 4260 } 4261 4262 /** 4263 * Returns true if this view is focusable or if it contains a reachable View 4264 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4265 * is a View whose parents do not block descendants focus. 4266 * 4267 * Only {@link #VISIBLE} views are considered focusable. 4268 * 4269 * @return True if the view is focusable or if the view contains a focusable 4270 * View, false otherwise. 4271 * 4272 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4273 */ 4274 public boolean hasFocusable() { 4275 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4276 } 4277 4278 /** 4279 * Called by the view system when the focus state of this view changes. 4280 * When the focus change event is caused by directional navigation, direction 4281 * and previouslyFocusedRect provide insight into where the focus is coming from. 4282 * When overriding, be sure to call up through to the super class so that 4283 * the standard focus handling will occur. 4284 * 4285 * @param gainFocus True if the View has focus; false otherwise. 4286 * @param direction The direction focus has moved when requestFocus() 4287 * is called to give this view focus. Values are 4288 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4289 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4290 * It may not always apply, in which case use the default. 4291 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4292 * system, of the previously focused view. If applicable, this will be 4293 * passed in as finer grained information about where the focus is coming 4294 * from (in addition to direction). Will be <code>null</code> otherwise. 4295 */ 4296 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4297 if (gainFocus) { 4298 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4299 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4300 } 4301 } 4302 4303 InputMethodManager imm = InputMethodManager.peekInstance(); 4304 if (!gainFocus) { 4305 if (isPressed()) { 4306 setPressed(false); 4307 } 4308 if (imm != null && mAttachInfo != null 4309 && mAttachInfo.mHasWindowFocus) { 4310 imm.focusOut(this); 4311 } 4312 onFocusLost(); 4313 } else if (imm != null && mAttachInfo != null 4314 && mAttachInfo.mHasWindowFocus) { 4315 imm.focusIn(this); 4316 } 4317 4318 invalidate(true); 4319 ListenerInfo li = mListenerInfo; 4320 if (li != null && li.mOnFocusChangeListener != null) { 4321 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4322 } 4323 4324 if (mAttachInfo != null) { 4325 mAttachInfo.mKeyDispatchState.reset(this); 4326 } 4327 } 4328 4329 /** 4330 * Sends an accessibility event of the given type. If accessiiblity is 4331 * not enabled this method has no effect. The default implementation calls 4332 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4333 * to populate information about the event source (this View), then calls 4334 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4335 * populate the text content of the event source including its descendants, 4336 * and last calls 4337 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4338 * on its parent to resuest sending of the event to interested parties. 4339 * <p> 4340 * If an {@link AccessibilityDelegate} has been specified via calling 4341 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4342 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4343 * responsible for handling this call. 4344 * </p> 4345 * 4346 * @param eventType The type of the event to send, as defined by several types from 4347 * {@link android.view.accessibility.AccessibilityEvent}, such as 4348 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4349 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4350 * 4351 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4352 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4353 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4354 * @see AccessibilityDelegate 4355 */ 4356 public void sendAccessibilityEvent(int eventType) { 4357 if (mAccessibilityDelegate != null) { 4358 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4359 } else { 4360 sendAccessibilityEventInternal(eventType); 4361 } 4362 } 4363 4364 /** 4365 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4366 * {@link AccessibilityEvent} to make an announcement which is related to some 4367 * sort of a context change for which none of the events representing UI transitions 4368 * is a good fit. For example, announcing a new page in a book. If accessibility 4369 * is not enabled this method does nothing. 4370 * 4371 * @param text The announcement text. 4372 */ 4373 public void announceForAccessibility(CharSequence text) { 4374 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4375 AccessibilityEvent event = AccessibilityEvent.obtain( 4376 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4377 onInitializeAccessibilityEvent(event); 4378 event.getText().add(text); 4379 event.setContentDescription(null); 4380 mParent.requestSendAccessibilityEvent(this, event); 4381 } 4382 } 4383 4384 /** 4385 * @see #sendAccessibilityEvent(int) 4386 * 4387 * Note: Called from the default {@link AccessibilityDelegate}. 4388 */ 4389 void sendAccessibilityEventInternal(int eventType) { 4390 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4391 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4392 } 4393 } 4394 4395 /** 4396 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4397 * takes as an argument an empty {@link AccessibilityEvent} and does not 4398 * perform a check whether accessibility is enabled. 4399 * <p> 4400 * If an {@link AccessibilityDelegate} has been specified via calling 4401 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4402 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4403 * is responsible for handling this call. 4404 * </p> 4405 * 4406 * @param event The event to send. 4407 * 4408 * @see #sendAccessibilityEvent(int) 4409 */ 4410 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4411 if (mAccessibilityDelegate != null) { 4412 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4413 } else { 4414 sendAccessibilityEventUncheckedInternal(event); 4415 } 4416 } 4417 4418 /** 4419 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4420 * 4421 * Note: Called from the default {@link AccessibilityDelegate}. 4422 */ 4423 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4424 if (!isShown()) { 4425 return; 4426 } 4427 onInitializeAccessibilityEvent(event); 4428 // Only a subset of accessibility events populates text content. 4429 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4430 dispatchPopulateAccessibilityEvent(event); 4431 } 4432 // In the beginning we called #isShown(), so we know that getParent() is not null. 4433 getParent().requestSendAccessibilityEvent(this, event); 4434 } 4435 4436 /** 4437 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4438 * to its children for adding their text content to the event. Note that the 4439 * event text is populated in a separate dispatch path since we add to the 4440 * event not only the text of the source but also the text of all its descendants. 4441 * A typical implementation will call 4442 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4443 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4444 * on each child. Override this method if custom population of the event text 4445 * content is required. 4446 * <p> 4447 * If an {@link AccessibilityDelegate} has been specified via calling 4448 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4449 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4450 * is responsible for handling this call. 4451 * </p> 4452 * <p> 4453 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4454 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4455 * </p> 4456 * 4457 * @param event The event. 4458 * 4459 * @return True if the event population was completed. 4460 */ 4461 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4462 if (mAccessibilityDelegate != null) { 4463 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4464 } else { 4465 return dispatchPopulateAccessibilityEventInternal(event); 4466 } 4467 } 4468 4469 /** 4470 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4471 * 4472 * Note: Called from the default {@link AccessibilityDelegate}. 4473 */ 4474 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4475 onPopulateAccessibilityEvent(event); 4476 return false; 4477 } 4478 4479 /** 4480 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4481 * giving a chance to this View to populate the accessibility event with its 4482 * text content. While this method is free to modify event 4483 * attributes other than text content, doing so should normally be performed in 4484 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4485 * <p> 4486 * Example: Adding formatted date string to an accessibility event in addition 4487 * to the text added by the super implementation: 4488 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4489 * super.onPopulateAccessibilityEvent(event); 4490 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4491 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4492 * mCurrentDate.getTimeInMillis(), flags); 4493 * event.getText().add(selectedDateUtterance); 4494 * }</pre> 4495 * <p> 4496 * If an {@link AccessibilityDelegate} has been specified via calling 4497 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4498 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4499 * is responsible for handling this call. 4500 * </p> 4501 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4502 * information to the event, in case the default implementation has basic information to add. 4503 * </p> 4504 * 4505 * @param event The accessibility event which to populate. 4506 * 4507 * @see #sendAccessibilityEvent(int) 4508 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4509 */ 4510 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4511 if (mAccessibilityDelegate != null) { 4512 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4513 } else { 4514 onPopulateAccessibilityEventInternal(event); 4515 } 4516 } 4517 4518 /** 4519 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4520 * 4521 * Note: Called from the default {@link AccessibilityDelegate}. 4522 */ 4523 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4524 4525 } 4526 4527 /** 4528 * Initializes an {@link AccessibilityEvent} with information about 4529 * this View which is the event source. In other words, the source of 4530 * an accessibility event is the view whose state change triggered firing 4531 * the event. 4532 * <p> 4533 * Example: Setting the password property of an event in addition 4534 * to properties set by the super implementation: 4535 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4536 * super.onInitializeAccessibilityEvent(event); 4537 * event.setPassword(true); 4538 * }</pre> 4539 * <p> 4540 * If an {@link AccessibilityDelegate} has been specified via calling 4541 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4542 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4543 * is responsible for handling this call. 4544 * </p> 4545 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4546 * information to the event, in case the default implementation has basic information to add. 4547 * </p> 4548 * @param event The event to initialize. 4549 * 4550 * @see #sendAccessibilityEvent(int) 4551 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4552 */ 4553 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4554 if (mAccessibilityDelegate != null) { 4555 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4556 } else { 4557 onInitializeAccessibilityEventInternal(event); 4558 } 4559 } 4560 4561 /** 4562 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4563 * 4564 * Note: Called from the default {@link AccessibilityDelegate}. 4565 */ 4566 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4567 event.setSource(this); 4568 event.setClassName(View.class.getName()); 4569 event.setPackageName(getContext().getPackageName()); 4570 event.setEnabled(isEnabled()); 4571 event.setContentDescription(mContentDescription); 4572 4573 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4574 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4575 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4576 FOCUSABLES_ALL); 4577 event.setItemCount(focusablesTempList.size()); 4578 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4579 focusablesTempList.clear(); 4580 } 4581 } 4582 4583 /** 4584 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4585 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4586 * This method is responsible for obtaining an accessibility node info from a 4587 * pool of reusable instances and calling 4588 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4589 * initialize the former. 4590 * <p> 4591 * Note: The client is responsible for recycling the obtained instance by calling 4592 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4593 * </p> 4594 * 4595 * @return A populated {@link AccessibilityNodeInfo}. 4596 * 4597 * @see AccessibilityNodeInfo 4598 */ 4599 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4600 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4601 if (provider != null) { 4602 return provider.createAccessibilityNodeInfo(View.NO_ID); 4603 } else { 4604 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4605 onInitializeAccessibilityNodeInfo(info); 4606 return info; 4607 } 4608 } 4609 4610 /** 4611 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4612 * The base implementation sets: 4613 * <ul> 4614 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4615 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4616 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4617 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4618 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4619 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4620 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4621 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4622 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4623 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4624 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4625 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4626 * </ul> 4627 * <p> 4628 * Subclasses should override this method, call the super implementation, 4629 * and set additional attributes. 4630 * </p> 4631 * <p> 4632 * If an {@link AccessibilityDelegate} has been specified via calling 4633 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4634 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4635 * is responsible for handling this call. 4636 * </p> 4637 * 4638 * @param info The instance to initialize. 4639 */ 4640 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4641 if (mAccessibilityDelegate != null) { 4642 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4643 } else { 4644 onInitializeAccessibilityNodeInfoInternal(info); 4645 } 4646 } 4647 4648 /** 4649 * Gets the location of this view in screen coordintates. 4650 * 4651 * @param outRect The output location 4652 */ 4653 private void getBoundsOnScreen(Rect outRect) { 4654 if (mAttachInfo == null) { 4655 return; 4656 } 4657 4658 RectF position = mAttachInfo.mTmpTransformRect; 4659 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4660 4661 if (!hasIdentityMatrix()) { 4662 getMatrix().mapRect(position); 4663 } 4664 4665 position.offset(mLeft, mTop); 4666 4667 ViewParent parent = mParent; 4668 while (parent instanceof View) { 4669 View parentView = (View) parent; 4670 4671 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4672 4673 if (!parentView.hasIdentityMatrix()) { 4674 parentView.getMatrix().mapRect(position); 4675 } 4676 4677 position.offset(parentView.mLeft, parentView.mTop); 4678 4679 parent = parentView.mParent; 4680 } 4681 4682 if (parent instanceof ViewRootImpl) { 4683 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4684 position.offset(0, -viewRootImpl.mCurScrollY); 4685 } 4686 4687 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4688 4689 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4690 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4691 } 4692 4693 /** 4694 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4695 * 4696 * Note: Called from the default {@link AccessibilityDelegate}. 4697 */ 4698 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4699 Rect bounds = mAttachInfo.mTmpInvalRect; 4700 4701 getDrawingRect(bounds); 4702 info.setBoundsInParent(bounds); 4703 4704 getBoundsOnScreen(bounds); 4705 info.setBoundsInScreen(bounds); 4706 4707 ViewParent parent = getParentForAccessibility(); 4708 if (parent instanceof View) { 4709 info.setParent((View) parent); 4710 } 4711 4712 info.setVisibleToUser(isVisibleToUser()); 4713 4714 info.setPackageName(mContext.getPackageName()); 4715 info.setClassName(View.class.getName()); 4716 info.setContentDescription(getContentDescription()); 4717 4718 info.setEnabled(isEnabled()); 4719 info.setClickable(isClickable()); 4720 info.setFocusable(isFocusable()); 4721 info.setFocused(isFocused()); 4722 info.setAccessibilityFocused(isAccessibilityFocused()); 4723 info.setSelected(isSelected()); 4724 info.setLongClickable(isLongClickable()); 4725 4726 // TODO: These make sense only if we are in an AdapterView but all 4727 // views can be selected. Maybe from accessiiblity perspective 4728 // we should report as selectable view in an AdapterView. 4729 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4730 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4731 4732 if (isFocusable()) { 4733 if (isFocused()) { 4734 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4735 } else { 4736 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4737 } 4738 } 4739 4740 if (!isAccessibilityFocused()) { 4741 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4742 } else { 4743 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4744 } 4745 4746 if (isClickable() && isEnabled()) { 4747 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4748 } 4749 4750 if (isLongClickable() && isEnabled()) { 4751 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4752 } 4753 4754 if (mContentDescription != null && mContentDescription.length() > 0) { 4755 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4756 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4757 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4758 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4759 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4760 } 4761 } 4762 4763 /** 4764 * Returns the delta between the actual and last reported window left. 4765 * 4766 * @hide 4767 */ 4768 public int getActualAndReportedWindowLeftDelta() { 4769// if (mAttachInfo != null) { 4770// return mAttachInfo.mActualWindowLeft - mAttachInfo.mWindowLeft; 4771// } 4772 return 0; 4773 } 4774 4775 /** 4776 * Returns the delta between the actual and last reported window top. 4777 * 4778 * @hide 4779 */ 4780 public int getActualAndReportedWindowTopDelta() { 4781// if (mAttachInfo != null) { 4782// return mAttachInfo.mActualWindowTop - mAttachInfo.mWindowTop; 4783// } 4784 return 0; 4785 } 4786 4787 /** 4788 * Computes whether this view is visible to the user. Such a view is 4789 * attached, visible, all its predecessors are visible, it is not clipped 4790 * entirely by its predecessors, and has an alpha greater than zero. 4791 * 4792 * @return Whether the view is visible on the screen. 4793 * 4794 * @hide 4795 */ 4796 protected boolean isVisibleToUser() { 4797 return isVisibleToUser(null); 4798 } 4799 4800 /** 4801 * Computes whether the given portion of this view is visible to the user. Such a view is 4802 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4803 * the specified portion is not clipped entirely by its predecessors. 4804 * 4805 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4806 * <code>null</code>, and the entire view will be tested in this case. 4807 * When <code>true</code> is returned by the function, the actual visible 4808 * region will be stored in this parameter; that is, if boundInView is fully 4809 * contained within the view, no modification will be made, otherwise regions 4810 * outside of the visible area of the view will be clipped. 4811 * 4812 * @return Whether the specified portion of the view is visible on the screen. 4813 * 4814 * @hide 4815 */ 4816 protected boolean isVisibleToUser(Rect boundInView) { 4817 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4818 Point offset = mAttachInfo.mPoint; 4819 // The first two checks are made also made by isShown() which 4820 // however traverses the tree up to the parent to catch that. 4821 // Therefore, we do some fail fast check to minimize the up 4822 // tree traversal. 4823 boolean isVisible = mAttachInfo != null 4824 && mAttachInfo.mWindowVisibility == View.VISIBLE 4825 && getAlpha() > 0 4826 && isShown() 4827 && getGlobalVisibleRect(visibleRect, offset); 4828 if (isVisible && boundInView != null) { 4829 visibleRect.offset(-offset.x, -offset.y); 4830 isVisible &= boundInView.intersect(visibleRect); 4831 } 4832 return isVisible; 4833 } 4834 4835 /** 4836 * Sets a delegate for implementing accessibility support via compositon as 4837 * opposed to inheritance. The delegate's primary use is for implementing 4838 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4839 * 4840 * @param delegate The delegate instance. 4841 * 4842 * @see AccessibilityDelegate 4843 */ 4844 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4845 mAccessibilityDelegate = delegate; 4846 } 4847 4848 /** 4849 * Gets the provider for managing a virtual view hierarchy rooted at this View 4850 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4851 * that explore the window content. 4852 * <p> 4853 * If this method returns an instance, this instance is responsible for managing 4854 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4855 * View including the one representing the View itself. Similarly the returned 4856 * instance is responsible for performing accessibility actions on any virtual 4857 * view or the root view itself. 4858 * </p> 4859 * <p> 4860 * If an {@link AccessibilityDelegate} has been specified via calling 4861 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4862 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4863 * is responsible for handling this call. 4864 * </p> 4865 * 4866 * @return The provider. 4867 * 4868 * @see AccessibilityNodeProvider 4869 */ 4870 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4871 if (mAccessibilityDelegate != null) { 4872 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4873 } else { 4874 return null; 4875 } 4876 } 4877 4878 /** 4879 * Gets the unique identifier of this view on the screen for accessibility purposes. 4880 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4881 * 4882 * @return The view accessibility id. 4883 * 4884 * @hide 4885 */ 4886 public int getAccessibilityViewId() { 4887 if (mAccessibilityViewId == NO_ID) { 4888 mAccessibilityViewId = sNextAccessibilityViewId++; 4889 } 4890 return mAccessibilityViewId; 4891 } 4892 4893 /** 4894 * Gets the unique identifier of the window in which this View reseides. 4895 * 4896 * @return The window accessibility id. 4897 * 4898 * @hide 4899 */ 4900 public int getAccessibilityWindowId() { 4901 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4902 } 4903 4904 /** 4905 * Gets the {@link View} description. It briefly describes the view and is 4906 * primarily used for accessibility support. Set this property to enable 4907 * better accessibility support for your application. This is especially 4908 * true for views that do not have textual representation (For example, 4909 * ImageButton). 4910 * 4911 * @return The content description. 4912 * 4913 * @attr ref android.R.styleable#View_contentDescription 4914 */ 4915 @ViewDebug.ExportedProperty(category = "accessibility") 4916 public CharSequence getContentDescription() { 4917 return mContentDescription; 4918 } 4919 4920 /** 4921 * Sets the {@link View} description. It briefly describes the view and is 4922 * primarily used for accessibility support. Set this property to enable 4923 * better accessibility support for your application. This is especially 4924 * true for views that do not have textual representation (For example, 4925 * ImageButton). 4926 * 4927 * @param contentDescription The content description. 4928 * 4929 * @attr ref android.R.styleable#View_contentDescription 4930 */ 4931 @RemotableViewMethod 4932 public void setContentDescription(CharSequence contentDescription) { 4933 mContentDescription = contentDescription; 4934 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 4935 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 4936 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 4937 } 4938 } 4939 4940 /** 4941 * Invoked whenever this view loses focus, either by losing window focus or by losing 4942 * focus within its window. This method can be used to clear any state tied to the 4943 * focus. For instance, if a button is held pressed with the trackball and the window 4944 * loses focus, this method can be used to cancel the press. 4945 * 4946 * Subclasses of View overriding this method should always call super.onFocusLost(). 4947 * 4948 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4949 * @see #onWindowFocusChanged(boolean) 4950 * 4951 * @hide pending API council approval 4952 */ 4953 protected void onFocusLost() { 4954 resetPressedState(); 4955 } 4956 4957 private void resetPressedState() { 4958 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4959 return; 4960 } 4961 4962 if (isPressed()) { 4963 setPressed(false); 4964 4965 if (!mHasPerformedLongPress) { 4966 removeLongPressCallback(); 4967 } 4968 } 4969 } 4970 4971 /** 4972 * Returns true if this view has focus 4973 * 4974 * @return True if this view has focus, false otherwise. 4975 */ 4976 @ViewDebug.ExportedProperty(category = "focus") 4977 public boolean isFocused() { 4978 return (mPrivateFlags & FOCUSED) != 0; 4979 } 4980 4981 /** 4982 * Find the view in the hierarchy rooted at this view that currently has 4983 * focus. 4984 * 4985 * @return The view that currently has focus, or null if no focused view can 4986 * be found. 4987 */ 4988 public View findFocus() { 4989 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4990 } 4991 4992 /** 4993 * Indicates whether this view is one of the set of scrollable containers in 4994 * its window. 4995 * 4996 * @return whether this view is one of the set of scrollable containers in 4997 * its window 4998 * 4999 * @attr ref android.R.styleable#View_isScrollContainer 5000 */ 5001 public boolean isScrollContainer() { 5002 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5003 } 5004 5005 /** 5006 * Change whether this view is one of the set of scrollable containers in 5007 * its window. This will be used to determine whether the window can 5008 * resize or must pan when a soft input area is open -- scrollable 5009 * containers allow the window to use resize mode since the container 5010 * will appropriately shrink. 5011 * 5012 * @attr ref android.R.styleable#View_isScrollContainer 5013 */ 5014 public void setScrollContainer(boolean isScrollContainer) { 5015 if (isScrollContainer) { 5016 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5017 mAttachInfo.mScrollContainers.add(this); 5018 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5019 } 5020 mPrivateFlags |= SCROLL_CONTAINER; 5021 } else { 5022 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5023 mAttachInfo.mScrollContainers.remove(this); 5024 } 5025 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5026 } 5027 } 5028 5029 /** 5030 * Returns the quality of the drawing cache. 5031 * 5032 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5033 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5034 * 5035 * @see #setDrawingCacheQuality(int) 5036 * @see #setDrawingCacheEnabled(boolean) 5037 * @see #isDrawingCacheEnabled() 5038 * 5039 * @attr ref android.R.styleable#View_drawingCacheQuality 5040 */ 5041 public int getDrawingCacheQuality() { 5042 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5043 } 5044 5045 /** 5046 * Set the drawing cache quality of this view. This value is used only when the 5047 * drawing cache is enabled 5048 * 5049 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5050 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5051 * 5052 * @see #getDrawingCacheQuality() 5053 * @see #setDrawingCacheEnabled(boolean) 5054 * @see #isDrawingCacheEnabled() 5055 * 5056 * @attr ref android.R.styleable#View_drawingCacheQuality 5057 */ 5058 public void setDrawingCacheQuality(int quality) { 5059 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5060 } 5061 5062 /** 5063 * Returns whether the screen should remain on, corresponding to the current 5064 * value of {@link #KEEP_SCREEN_ON}. 5065 * 5066 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5067 * 5068 * @see #setKeepScreenOn(boolean) 5069 * 5070 * @attr ref android.R.styleable#View_keepScreenOn 5071 */ 5072 public boolean getKeepScreenOn() { 5073 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5074 } 5075 5076 /** 5077 * Controls whether the screen should remain on, modifying the 5078 * value of {@link #KEEP_SCREEN_ON}. 5079 * 5080 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5081 * 5082 * @see #getKeepScreenOn() 5083 * 5084 * @attr ref android.R.styleable#View_keepScreenOn 5085 */ 5086 public void setKeepScreenOn(boolean keepScreenOn) { 5087 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5088 } 5089 5090 /** 5091 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5092 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5093 * 5094 * @attr ref android.R.styleable#View_nextFocusLeft 5095 */ 5096 public int getNextFocusLeftId() { 5097 return mNextFocusLeftId; 5098 } 5099 5100 /** 5101 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5102 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5103 * decide automatically. 5104 * 5105 * @attr ref android.R.styleable#View_nextFocusLeft 5106 */ 5107 public void setNextFocusLeftId(int nextFocusLeftId) { 5108 mNextFocusLeftId = nextFocusLeftId; 5109 } 5110 5111 /** 5112 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5113 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5114 * 5115 * @attr ref android.R.styleable#View_nextFocusRight 5116 */ 5117 public int getNextFocusRightId() { 5118 return mNextFocusRightId; 5119 } 5120 5121 /** 5122 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5123 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5124 * decide automatically. 5125 * 5126 * @attr ref android.R.styleable#View_nextFocusRight 5127 */ 5128 public void setNextFocusRightId(int nextFocusRightId) { 5129 mNextFocusRightId = nextFocusRightId; 5130 } 5131 5132 /** 5133 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5134 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5135 * 5136 * @attr ref android.R.styleable#View_nextFocusUp 5137 */ 5138 public int getNextFocusUpId() { 5139 return mNextFocusUpId; 5140 } 5141 5142 /** 5143 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5144 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5145 * decide automatically. 5146 * 5147 * @attr ref android.R.styleable#View_nextFocusUp 5148 */ 5149 public void setNextFocusUpId(int nextFocusUpId) { 5150 mNextFocusUpId = nextFocusUpId; 5151 } 5152 5153 /** 5154 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5155 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5156 * 5157 * @attr ref android.R.styleable#View_nextFocusDown 5158 */ 5159 public int getNextFocusDownId() { 5160 return mNextFocusDownId; 5161 } 5162 5163 /** 5164 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5165 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5166 * decide automatically. 5167 * 5168 * @attr ref android.R.styleable#View_nextFocusDown 5169 */ 5170 public void setNextFocusDownId(int nextFocusDownId) { 5171 mNextFocusDownId = nextFocusDownId; 5172 } 5173 5174 /** 5175 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5176 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5177 * 5178 * @attr ref android.R.styleable#View_nextFocusForward 5179 */ 5180 public int getNextFocusForwardId() { 5181 return mNextFocusForwardId; 5182 } 5183 5184 /** 5185 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5186 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5187 * decide automatically. 5188 * 5189 * @attr ref android.R.styleable#View_nextFocusForward 5190 */ 5191 public void setNextFocusForwardId(int nextFocusForwardId) { 5192 mNextFocusForwardId = nextFocusForwardId; 5193 } 5194 5195 /** 5196 * Returns the visibility of this view and all of its ancestors 5197 * 5198 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5199 */ 5200 public boolean isShown() { 5201 View current = this; 5202 //noinspection ConstantConditions 5203 do { 5204 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5205 return false; 5206 } 5207 ViewParent parent = current.mParent; 5208 if (parent == null) { 5209 return false; // We are not attached to the view root 5210 } 5211 if (!(parent instanceof View)) { 5212 return true; 5213 } 5214 current = (View) parent; 5215 } while (current != null); 5216 5217 return false; 5218 } 5219 5220 /** 5221 * Called by the view hierarchy when the content insets for a window have 5222 * changed, to allow it to adjust its content to fit within those windows. 5223 * The content insets tell you the space that the status bar, input method, 5224 * and other system windows infringe on the application's window. 5225 * 5226 * <p>You do not normally need to deal with this function, since the default 5227 * window decoration given to applications takes care of applying it to the 5228 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5229 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5230 * and your content can be placed under those system elements. You can then 5231 * use this method within your view hierarchy if you have parts of your UI 5232 * which you would like to ensure are not being covered. 5233 * 5234 * <p>The default implementation of this method simply applies the content 5235 * inset's to the view's padding, consuming that content (modifying the 5236 * insets to be 0), and returning true. This behavior is off by default, but can 5237 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5238 * 5239 * <p>This function's traversal down the hierarchy is depth-first. The same content 5240 * insets object is propagated down the hierarchy, so any changes made to it will 5241 * be seen by all following views (including potentially ones above in 5242 * the hierarchy since this is a depth-first traversal). The first view 5243 * that returns true will abort the entire traversal. 5244 * 5245 * <p>The default implementation works well for a situation where it is 5246 * used with a container that covers the entire window, allowing it to 5247 * apply the appropriate insets to its content on all edges. If you need 5248 * a more complicated layout (such as two different views fitting system 5249 * windows, one on the top of the window, and one on the bottom), 5250 * you can override the method and handle the insets however you would like. 5251 * Note that the insets provided by the framework are always relative to the 5252 * far edges of the window, not accounting for the location of the called view 5253 * within that window. (In fact when this method is called you do not yet know 5254 * where the layout will place the view, as it is done before layout happens.) 5255 * 5256 * <p>Note: unlike many View methods, there is no dispatch phase to this 5257 * call. If you are overriding it in a ViewGroup and want to allow the 5258 * call to continue to your children, you must be sure to call the super 5259 * implementation. 5260 * 5261 * <p>Here is a sample layout that makes use of fitting system windows 5262 * to have controls for a video view placed inside of the window decorations 5263 * that it hides and shows. This can be used with code like the second 5264 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5265 * 5266 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5267 * 5268 * @param insets Current content insets of the window. Prior to 5269 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5270 * the insets or else you and Android will be unhappy. 5271 * 5272 * @return Return true if this view applied the insets and it should not 5273 * continue propagating further down the hierarchy, false otherwise. 5274 * @see #getFitsSystemWindows() 5275 * @see #setFitsSystemWindows() 5276 * @see #setSystemUiVisibility(int) 5277 */ 5278 protected boolean fitSystemWindows(Rect insets) { 5279 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5280 mUserPaddingStart = -1; 5281 mUserPaddingEnd = -1; 5282 mUserPaddingRelative = false; 5283 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5284 || mAttachInfo == null 5285 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5286 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5287 return true; 5288 } else { 5289 internalSetPadding(0, 0, 0, 0); 5290 return false; 5291 } 5292 } 5293 return false; 5294 } 5295 5296 /** 5297 * Sets whether or not this view should account for system screen decorations 5298 * such as the status bar and inset its content; that is, controlling whether 5299 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5300 * executed. See that method for more details. 5301 * 5302 * <p>Note that if you are providing your own implementation of 5303 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5304 * flag to true -- your implementation will be overriding the default 5305 * implementation that checks this flag. 5306 * 5307 * @param fitSystemWindows If true, then the default implementation of 5308 * {@link #fitSystemWindows(Rect)} will be executed. 5309 * 5310 * @attr ref android.R.styleable#View_fitsSystemWindows 5311 * @see #getFitsSystemWindows() 5312 * @see #fitSystemWindows(Rect) 5313 * @see #setSystemUiVisibility(int) 5314 */ 5315 public void setFitsSystemWindows(boolean fitSystemWindows) { 5316 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5317 } 5318 5319 /** 5320 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5321 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5322 * will be executed. 5323 * 5324 * @return Returns true if the default implementation of 5325 * {@link #fitSystemWindows(Rect)} will be executed. 5326 * 5327 * @attr ref android.R.styleable#View_fitsSystemWindows 5328 * @see #setFitsSystemWindows() 5329 * @see #fitSystemWindows(Rect) 5330 * @see #setSystemUiVisibility(int) 5331 */ 5332 public boolean getFitsSystemWindows() { 5333 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5334 } 5335 5336 /** @hide */ 5337 public boolean fitsSystemWindows() { 5338 return getFitsSystemWindows(); 5339 } 5340 5341 /** 5342 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5343 */ 5344 public void requestFitSystemWindows() { 5345 if (mParent != null) { 5346 mParent.requestFitSystemWindows(); 5347 } 5348 } 5349 5350 /** 5351 * For use by PhoneWindow to make its own system window fitting optional. 5352 * @hide 5353 */ 5354 public void makeOptionalFitsSystemWindows() { 5355 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5356 } 5357 5358 /** 5359 * Returns the visibility status for this view. 5360 * 5361 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5362 * @attr ref android.R.styleable#View_visibility 5363 */ 5364 @ViewDebug.ExportedProperty(mapping = { 5365 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5366 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5367 @ViewDebug.IntToString(from = GONE, to = "GONE") 5368 }) 5369 public int getVisibility() { 5370 return mViewFlags & VISIBILITY_MASK; 5371 } 5372 5373 /** 5374 * Set the enabled state of this view. 5375 * 5376 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5377 * @attr ref android.R.styleable#View_visibility 5378 */ 5379 @RemotableViewMethod 5380 public void setVisibility(int visibility) { 5381 setFlags(visibility, VISIBILITY_MASK); 5382 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5383 } 5384 5385 /** 5386 * Returns the enabled status for this view. The interpretation of the 5387 * enabled state varies by subclass. 5388 * 5389 * @return True if this view is enabled, false otherwise. 5390 */ 5391 @ViewDebug.ExportedProperty 5392 public boolean isEnabled() { 5393 return (mViewFlags & ENABLED_MASK) == ENABLED; 5394 } 5395 5396 /** 5397 * Set the enabled state of this view. The interpretation of the enabled 5398 * state varies by subclass. 5399 * 5400 * @param enabled True if this view is enabled, false otherwise. 5401 */ 5402 @RemotableViewMethod 5403 public void setEnabled(boolean enabled) { 5404 if (enabled == isEnabled()) return; 5405 5406 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5407 5408 /* 5409 * The View most likely has to change its appearance, so refresh 5410 * the drawable state. 5411 */ 5412 refreshDrawableState(); 5413 5414 // Invalidate too, since the default behavior for views is to be 5415 // be drawn at 50% alpha rather than to change the drawable. 5416 invalidate(true); 5417 } 5418 5419 /** 5420 * Set whether this view can receive the focus. 5421 * 5422 * Setting this to false will also ensure that this view is not focusable 5423 * in touch mode. 5424 * 5425 * @param focusable If true, this view can receive the focus. 5426 * 5427 * @see #setFocusableInTouchMode(boolean) 5428 * @attr ref android.R.styleable#View_focusable 5429 */ 5430 public void setFocusable(boolean focusable) { 5431 if (!focusable) { 5432 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5433 } 5434 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5435 } 5436 5437 /** 5438 * Set whether this view can receive focus while in touch mode. 5439 * 5440 * Setting this to true will also ensure that this view is focusable. 5441 * 5442 * @param focusableInTouchMode If true, this view can receive the focus while 5443 * in touch mode. 5444 * 5445 * @see #setFocusable(boolean) 5446 * @attr ref android.R.styleable#View_focusableInTouchMode 5447 */ 5448 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5449 // Focusable in touch mode should always be set before the focusable flag 5450 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5451 // which, in touch mode, will not successfully request focus on this view 5452 // because the focusable in touch mode flag is not set 5453 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5454 if (focusableInTouchMode) { 5455 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5456 } 5457 } 5458 5459 /** 5460 * Set whether this view should have sound effects enabled for events such as 5461 * clicking and touching. 5462 * 5463 * <p>You may wish to disable sound effects for a view if you already play sounds, 5464 * for instance, a dial key that plays dtmf tones. 5465 * 5466 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5467 * @see #isSoundEffectsEnabled() 5468 * @see #playSoundEffect(int) 5469 * @attr ref android.R.styleable#View_soundEffectsEnabled 5470 */ 5471 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5472 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5473 } 5474 5475 /** 5476 * @return whether this view should have sound effects enabled for events such as 5477 * clicking and touching. 5478 * 5479 * @see #setSoundEffectsEnabled(boolean) 5480 * @see #playSoundEffect(int) 5481 * @attr ref android.R.styleable#View_soundEffectsEnabled 5482 */ 5483 @ViewDebug.ExportedProperty 5484 public boolean isSoundEffectsEnabled() { 5485 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5486 } 5487 5488 /** 5489 * Set whether this view should have haptic feedback for events such as 5490 * long presses. 5491 * 5492 * <p>You may wish to disable haptic feedback if your view already controls 5493 * its own haptic feedback. 5494 * 5495 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5496 * @see #isHapticFeedbackEnabled() 5497 * @see #performHapticFeedback(int) 5498 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5499 */ 5500 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5501 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5502 } 5503 5504 /** 5505 * @return whether this view should have haptic feedback enabled for events 5506 * long presses. 5507 * 5508 * @see #setHapticFeedbackEnabled(boolean) 5509 * @see #performHapticFeedback(int) 5510 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5511 */ 5512 @ViewDebug.ExportedProperty 5513 public boolean isHapticFeedbackEnabled() { 5514 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5515 } 5516 5517 /** 5518 * Returns the layout direction for this view. 5519 * 5520 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5521 * {@link #LAYOUT_DIRECTION_RTL}, 5522 * {@link #LAYOUT_DIRECTION_INHERIT} or 5523 * {@link #LAYOUT_DIRECTION_LOCALE}. 5524 * @attr ref android.R.styleable#View_layoutDirection 5525 */ 5526 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5527 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5528 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5529 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5530 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5531 }) 5532 public int getLayoutDirection() { 5533 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5534 } 5535 5536 /** 5537 * Set the layout direction for this view. This will propagate a reset of layout direction 5538 * resolution to the view's children and resolve layout direction for this view. 5539 * 5540 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5541 * {@link #LAYOUT_DIRECTION_RTL}, 5542 * {@link #LAYOUT_DIRECTION_INHERIT} or 5543 * {@link #LAYOUT_DIRECTION_LOCALE}. 5544 * 5545 * @attr ref android.R.styleable#View_layoutDirection 5546 */ 5547 @RemotableViewMethod 5548 public void setLayoutDirection(int layoutDirection) { 5549 if (getLayoutDirection() != layoutDirection) { 5550 // Reset the current layout direction and the resolved one 5551 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5552 resetResolvedLayoutDirection(); 5553 // Set the new layout direction (filtered) and ask for a layout pass 5554 mPrivateFlags2 |= 5555 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5556 requestLayout(); 5557 } 5558 } 5559 5560 /** 5561 * Returns the resolved layout direction for this view. 5562 * 5563 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5564 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5565 */ 5566 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5567 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5568 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5569 }) 5570 public int getResolvedLayoutDirection() { 5571 // The layout direction will be resolved only if needed 5572 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5573 resolveLayoutDirection(); 5574 } 5575 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5576 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5577 } 5578 5579 /** 5580 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5581 * layout attribute and/or the inherited value from the parent 5582 * 5583 * @return true if the layout is right-to-left. 5584 */ 5585 @ViewDebug.ExportedProperty(category = "layout") 5586 public boolean isLayoutRtl() { 5587 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5588 } 5589 5590 /** 5591 * Indicates whether the view is currently tracking transient state that the 5592 * app should not need to concern itself with saving and restoring, but that 5593 * the framework should take special note to preserve when possible. 5594 * 5595 * <p>A view with transient state cannot be trivially rebound from an external 5596 * data source, such as an adapter binding item views in a list. This may be 5597 * because the view is performing an animation, tracking user selection 5598 * of content, or similar.</p> 5599 * 5600 * @return true if the view has transient state 5601 */ 5602 @ViewDebug.ExportedProperty(category = "layout") 5603 public boolean hasTransientState() { 5604 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5605 } 5606 5607 /** 5608 * Set whether this view is currently tracking transient state that the 5609 * framework should attempt to preserve when possible. This flag is reference counted, 5610 * so every call to setHasTransientState(true) should be paired with a later call 5611 * to setHasTransientState(false). 5612 * 5613 * <p>A view with transient state cannot be trivially rebound from an external 5614 * data source, such as an adapter binding item views in a list. This may be 5615 * because the view is performing an animation, tracking user selection 5616 * of content, or similar.</p> 5617 * 5618 * @param hasTransientState true if this view has transient state 5619 */ 5620 public void setHasTransientState(boolean hasTransientState) { 5621 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5622 mTransientStateCount - 1; 5623 if (mTransientStateCount < 0) { 5624 mTransientStateCount = 0; 5625 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5626 "unmatched pair of setHasTransientState calls"); 5627 } 5628 if ((hasTransientState && mTransientStateCount == 1) || 5629 (!hasTransientState && mTransientStateCount == 0)) { 5630 // update flag if we've just incremented up from 0 or decremented down to 0 5631 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5632 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5633 if (mParent != null) { 5634 try { 5635 mParent.childHasTransientStateChanged(this, hasTransientState); 5636 } catch (AbstractMethodError e) { 5637 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5638 " does not fully implement ViewParent", e); 5639 } 5640 } 5641 } 5642 } 5643 5644 /** 5645 * If this view doesn't do any drawing on its own, set this flag to 5646 * allow further optimizations. By default, this flag is not set on 5647 * View, but could be set on some View subclasses such as ViewGroup. 5648 * 5649 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5650 * you should clear this flag. 5651 * 5652 * @param willNotDraw whether or not this View draw on its own 5653 */ 5654 public void setWillNotDraw(boolean willNotDraw) { 5655 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5656 } 5657 5658 /** 5659 * Returns whether or not this View draws on its own. 5660 * 5661 * @return true if this view has nothing to draw, false otherwise 5662 */ 5663 @ViewDebug.ExportedProperty(category = "drawing") 5664 public boolean willNotDraw() { 5665 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5666 } 5667 5668 /** 5669 * When a View's drawing cache is enabled, drawing is redirected to an 5670 * offscreen bitmap. Some views, like an ImageView, must be able to 5671 * bypass this mechanism if they already draw a single bitmap, to avoid 5672 * unnecessary usage of the memory. 5673 * 5674 * @param willNotCacheDrawing true if this view does not cache its 5675 * drawing, false otherwise 5676 */ 5677 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5678 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5679 } 5680 5681 /** 5682 * Returns whether or not this View can cache its drawing or not. 5683 * 5684 * @return true if this view does not cache its drawing, false otherwise 5685 */ 5686 @ViewDebug.ExportedProperty(category = "drawing") 5687 public boolean willNotCacheDrawing() { 5688 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5689 } 5690 5691 /** 5692 * Indicates whether this view reacts to click events or not. 5693 * 5694 * @return true if the view is clickable, false otherwise 5695 * 5696 * @see #setClickable(boolean) 5697 * @attr ref android.R.styleable#View_clickable 5698 */ 5699 @ViewDebug.ExportedProperty 5700 public boolean isClickable() { 5701 return (mViewFlags & CLICKABLE) == CLICKABLE; 5702 } 5703 5704 /** 5705 * Enables or disables click events for this view. When a view 5706 * is clickable it will change its state to "pressed" on every click. 5707 * Subclasses should set the view clickable to visually react to 5708 * user's clicks. 5709 * 5710 * @param clickable true to make the view clickable, false otherwise 5711 * 5712 * @see #isClickable() 5713 * @attr ref android.R.styleable#View_clickable 5714 */ 5715 public void setClickable(boolean clickable) { 5716 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5717 } 5718 5719 /** 5720 * Indicates whether this view reacts to long click events or not. 5721 * 5722 * @return true if the view is long clickable, false otherwise 5723 * 5724 * @see #setLongClickable(boolean) 5725 * @attr ref android.R.styleable#View_longClickable 5726 */ 5727 public boolean isLongClickable() { 5728 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5729 } 5730 5731 /** 5732 * Enables or disables long click events for this view. When a view is long 5733 * clickable it reacts to the user holding down the button for a longer 5734 * duration than a tap. This event can either launch the listener or a 5735 * context menu. 5736 * 5737 * @param longClickable true to make the view long clickable, false otherwise 5738 * @see #isLongClickable() 5739 * @attr ref android.R.styleable#View_longClickable 5740 */ 5741 public void setLongClickable(boolean longClickable) { 5742 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5743 } 5744 5745 /** 5746 * Sets the pressed state for this view. 5747 * 5748 * @see #isClickable() 5749 * @see #setClickable(boolean) 5750 * 5751 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5752 * the View's internal state from a previously set "pressed" state. 5753 */ 5754 public void setPressed(boolean pressed) { 5755 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5756 5757 if (pressed) { 5758 mPrivateFlags |= PRESSED; 5759 } else { 5760 mPrivateFlags &= ~PRESSED; 5761 } 5762 5763 if (needsRefresh) { 5764 refreshDrawableState(); 5765 } 5766 dispatchSetPressed(pressed); 5767 } 5768 5769 /** 5770 * Dispatch setPressed to all of this View's children. 5771 * 5772 * @see #setPressed(boolean) 5773 * 5774 * @param pressed The new pressed state 5775 */ 5776 protected void dispatchSetPressed(boolean pressed) { 5777 } 5778 5779 /** 5780 * Indicates whether the view is currently in pressed state. Unless 5781 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5782 * the pressed state. 5783 * 5784 * @see #setPressed(boolean) 5785 * @see #isClickable() 5786 * @see #setClickable(boolean) 5787 * 5788 * @return true if the view is currently pressed, false otherwise 5789 */ 5790 public boolean isPressed() { 5791 return (mPrivateFlags & PRESSED) == PRESSED; 5792 } 5793 5794 /** 5795 * Indicates whether this view will save its state (that is, 5796 * whether its {@link #onSaveInstanceState} method will be called). 5797 * 5798 * @return Returns true if the view state saving is enabled, else false. 5799 * 5800 * @see #setSaveEnabled(boolean) 5801 * @attr ref android.R.styleable#View_saveEnabled 5802 */ 5803 public boolean isSaveEnabled() { 5804 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5805 } 5806 5807 /** 5808 * Controls whether the saving of this view's state is 5809 * enabled (that is, whether its {@link #onSaveInstanceState} method 5810 * will be called). Note that even if freezing is enabled, the 5811 * view still must have an id assigned to it (via {@link #setId(int)}) 5812 * for its state to be saved. This flag can only disable the 5813 * saving of this view; any child views may still have their state saved. 5814 * 5815 * @param enabled Set to false to <em>disable</em> state saving, or true 5816 * (the default) to allow it. 5817 * 5818 * @see #isSaveEnabled() 5819 * @see #setId(int) 5820 * @see #onSaveInstanceState() 5821 * @attr ref android.R.styleable#View_saveEnabled 5822 */ 5823 public void setSaveEnabled(boolean enabled) { 5824 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5825 } 5826 5827 /** 5828 * Gets whether the framework should discard touches when the view's 5829 * window is obscured by another visible window. 5830 * Refer to the {@link View} security documentation for more details. 5831 * 5832 * @return True if touch filtering is enabled. 5833 * 5834 * @see #setFilterTouchesWhenObscured(boolean) 5835 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5836 */ 5837 @ViewDebug.ExportedProperty 5838 public boolean getFilterTouchesWhenObscured() { 5839 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5840 } 5841 5842 /** 5843 * Sets whether the framework should discard touches when the view's 5844 * window is obscured by another visible window. 5845 * Refer to the {@link View} security documentation for more details. 5846 * 5847 * @param enabled True if touch filtering should be enabled. 5848 * 5849 * @see #getFilterTouchesWhenObscured 5850 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5851 */ 5852 public void setFilterTouchesWhenObscured(boolean enabled) { 5853 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5854 FILTER_TOUCHES_WHEN_OBSCURED); 5855 } 5856 5857 /** 5858 * Indicates whether the entire hierarchy under this view will save its 5859 * state when a state saving traversal occurs from its parent. The default 5860 * is true; if false, these views will not be saved unless 5861 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5862 * 5863 * @return Returns true if the view state saving from parent is enabled, else false. 5864 * 5865 * @see #setSaveFromParentEnabled(boolean) 5866 */ 5867 public boolean isSaveFromParentEnabled() { 5868 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5869 } 5870 5871 /** 5872 * Controls whether the entire hierarchy under this view will save its 5873 * state when a state saving traversal occurs from its parent. The default 5874 * is true; if false, these views will not be saved unless 5875 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5876 * 5877 * @param enabled Set to false to <em>disable</em> state saving, or true 5878 * (the default) to allow it. 5879 * 5880 * @see #isSaveFromParentEnabled() 5881 * @see #setId(int) 5882 * @see #onSaveInstanceState() 5883 */ 5884 public void setSaveFromParentEnabled(boolean enabled) { 5885 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5886 } 5887 5888 5889 /** 5890 * Returns whether this View is able to take focus. 5891 * 5892 * @return True if this view can take focus, or false otherwise. 5893 * @attr ref android.R.styleable#View_focusable 5894 */ 5895 @ViewDebug.ExportedProperty(category = "focus") 5896 public final boolean isFocusable() { 5897 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5898 } 5899 5900 /** 5901 * When a view is focusable, it may not want to take focus when in touch mode. 5902 * For example, a button would like focus when the user is navigating via a D-pad 5903 * so that the user can click on it, but once the user starts touching the screen, 5904 * the button shouldn't take focus 5905 * @return Whether the view is focusable in touch mode. 5906 * @attr ref android.R.styleable#View_focusableInTouchMode 5907 */ 5908 @ViewDebug.ExportedProperty 5909 public final boolean isFocusableInTouchMode() { 5910 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5911 } 5912 5913 /** 5914 * Find the nearest view in the specified direction that can take focus. 5915 * This does not actually give focus to that view. 5916 * 5917 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5918 * 5919 * @return The nearest focusable in the specified direction, or null if none 5920 * can be found. 5921 */ 5922 public View focusSearch(int direction) { 5923 if (mParent != null) { 5924 return mParent.focusSearch(this, direction); 5925 } else { 5926 return null; 5927 } 5928 } 5929 5930 /** 5931 * This method is the last chance for the focused view and its ancestors to 5932 * respond to an arrow key. This is called when the focused view did not 5933 * consume the key internally, nor could the view system find a new view in 5934 * the requested direction to give focus to. 5935 * 5936 * @param focused The currently focused view. 5937 * @param direction The direction focus wants to move. One of FOCUS_UP, 5938 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5939 * @return True if the this view consumed this unhandled move. 5940 */ 5941 public boolean dispatchUnhandledMove(View focused, int direction) { 5942 return false; 5943 } 5944 5945 /** 5946 * If a user manually specified the next view id for a particular direction, 5947 * use the root to look up the view. 5948 * @param root The root view of the hierarchy containing this view. 5949 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5950 * or FOCUS_BACKWARD. 5951 * @return The user specified next view, or null if there is none. 5952 */ 5953 View findUserSetNextFocus(View root, int direction) { 5954 switch (direction) { 5955 case FOCUS_LEFT: 5956 if (mNextFocusLeftId == View.NO_ID) return null; 5957 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5958 case FOCUS_RIGHT: 5959 if (mNextFocusRightId == View.NO_ID) return null; 5960 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5961 case FOCUS_UP: 5962 if (mNextFocusUpId == View.NO_ID) return null; 5963 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5964 case FOCUS_DOWN: 5965 if (mNextFocusDownId == View.NO_ID) return null; 5966 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5967 case FOCUS_FORWARD: 5968 if (mNextFocusForwardId == View.NO_ID) return null; 5969 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5970 case FOCUS_BACKWARD: { 5971 if (mID == View.NO_ID) return null; 5972 final int id = mID; 5973 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5974 @Override 5975 public boolean apply(View t) { 5976 return t.mNextFocusForwardId == id; 5977 } 5978 }); 5979 } 5980 } 5981 return null; 5982 } 5983 5984 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5985 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5986 @Override 5987 public boolean apply(View t) { 5988 return t.mID == childViewId; 5989 } 5990 }); 5991 5992 if (result == null) { 5993 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5994 + "by user for id " + childViewId); 5995 } 5996 return result; 5997 } 5998 5999 /** 6000 * Find and return all focusable views that are descendants of this view, 6001 * possibly including this view if it is focusable itself. 6002 * 6003 * @param direction The direction of the focus 6004 * @return A list of focusable views 6005 */ 6006 public ArrayList<View> getFocusables(int direction) { 6007 ArrayList<View> result = new ArrayList<View>(24); 6008 addFocusables(result, direction); 6009 return result; 6010 } 6011 6012 /** 6013 * Add any focusable views that are descendants of this view (possibly 6014 * including this view if it is focusable itself) to views. If we are in touch mode, 6015 * only add views that are also focusable in touch mode. 6016 * 6017 * @param views Focusable views found so far 6018 * @param direction The direction of the focus 6019 */ 6020 public void addFocusables(ArrayList<View> views, int direction) { 6021 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6022 } 6023 6024 /** 6025 * Adds any focusable views that are descendants of this view (possibly 6026 * including this view if it is focusable itself) to views. This method 6027 * adds all focusable views regardless if we are in touch mode or 6028 * only views focusable in touch mode if we are in touch mode or 6029 * only views that can take accessibility focus if accessibility is enabeld 6030 * depending on the focusable mode paramater. 6031 * 6032 * @param views Focusable views found so far or null if all we are interested is 6033 * the number of focusables. 6034 * @param direction The direction of the focus. 6035 * @param focusableMode The type of focusables to be added. 6036 * 6037 * @see #FOCUSABLES_ALL 6038 * @see #FOCUSABLES_TOUCH_MODE 6039 */ 6040 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6041 if (views == null) { 6042 return; 6043 } 6044 if (!isFocusable()) { 6045 return; 6046 } 6047 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6048 && isInTouchMode() && !isFocusableInTouchMode()) { 6049 return; 6050 } 6051 views.add(this); 6052 } 6053 6054 /** 6055 * Finds the Views that contain given text. The containment is case insensitive. 6056 * The search is performed by either the text that the View renders or the content 6057 * description that describes the view for accessibility purposes and the view does 6058 * not render or both. Clients can specify how the search is to be performed via 6059 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6060 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6061 * 6062 * @param outViews The output list of matching Views. 6063 * @param searched The text to match against. 6064 * 6065 * @see #FIND_VIEWS_WITH_TEXT 6066 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6067 * @see #setContentDescription(CharSequence) 6068 */ 6069 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6070 if (getAccessibilityNodeProvider() != null) { 6071 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6072 outViews.add(this); 6073 } 6074 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6075 && (searched != null && searched.length() > 0) 6076 && (mContentDescription != null && mContentDescription.length() > 0)) { 6077 String searchedLowerCase = searched.toString().toLowerCase(); 6078 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6079 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6080 outViews.add(this); 6081 } 6082 } 6083 } 6084 6085 /** 6086 * Find and return all touchable views that are descendants of this view, 6087 * possibly including this view if it is touchable itself. 6088 * 6089 * @return A list of touchable views 6090 */ 6091 public ArrayList<View> getTouchables() { 6092 ArrayList<View> result = new ArrayList<View>(); 6093 addTouchables(result); 6094 return result; 6095 } 6096 6097 /** 6098 * Add any touchable views that are descendants of this view (possibly 6099 * including this view if it is touchable itself) to views. 6100 * 6101 * @param views Touchable views found so far 6102 */ 6103 public void addTouchables(ArrayList<View> views) { 6104 final int viewFlags = mViewFlags; 6105 6106 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6107 && (viewFlags & ENABLED_MASK) == ENABLED) { 6108 views.add(this); 6109 } 6110 } 6111 6112 /** 6113 * Returns whether this View is accessibility focused. 6114 * 6115 * @return True if this View is accessibility focused. 6116 */ 6117 boolean isAccessibilityFocused() { 6118 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6119 } 6120 6121 /** 6122 * Call this to try to give accessibility focus to this view. 6123 * 6124 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6125 * returns false or the view is no visible or the view already has accessibility 6126 * focus. 6127 * 6128 * See also {@link #focusSearch(int)}, which is what you call to say that you 6129 * have focus, and you want your parent to look for the next one. 6130 * 6131 * @return Whether this view actually took accessibility focus. 6132 * 6133 * @hide 6134 */ 6135 public boolean requestAccessibilityFocus() { 6136 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6137 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6138 return false; 6139 } 6140 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6141 return false; 6142 } 6143 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6144 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6145 ViewRootImpl viewRootImpl = getViewRootImpl(); 6146 if (viewRootImpl != null) { 6147 viewRootImpl.setAccessibilityFocus(this, null); 6148 } 6149 invalidate(); 6150 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6151 notifyAccessibilityStateChanged(); 6152 return true; 6153 } 6154 return false; 6155 } 6156 6157 /** 6158 * Call this to try to clear accessibility focus of this view. 6159 * 6160 * See also {@link #focusSearch(int)}, which is what you call to say that you 6161 * have focus, and you want your parent to look for the next one. 6162 * 6163 * @hide 6164 */ 6165 public void clearAccessibilityFocus() { 6166 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6167 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6168 invalidate(); 6169 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6170 notifyAccessibilityStateChanged(); 6171 } 6172 // Clear the global reference of accessibility focus if this 6173 // view or any of its descendants had accessibility focus. 6174 ViewRootImpl viewRootImpl = getViewRootImpl(); 6175 if (viewRootImpl != null) { 6176 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6177 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6178 viewRootImpl.setAccessibilityFocus(null, null); 6179 } 6180 } 6181 } 6182 6183 private void sendAccessibilityHoverEvent(int eventType) { 6184 // Since we are not delivering to a client accessibility events from not 6185 // important views (unless the clinet request that) we need to fire the 6186 // event from the deepest view exposed to the client. As a consequence if 6187 // the user crosses a not exposed view the client will see enter and exit 6188 // of the exposed predecessor followed by and enter and exit of that same 6189 // predecessor when entering and exiting the not exposed descendant. This 6190 // is fine since the client has a clear idea which view is hovered at the 6191 // price of a couple more events being sent. This is a simple and 6192 // working solution. 6193 View source = this; 6194 while (true) { 6195 if (source.includeForAccessibility()) { 6196 source.sendAccessibilityEvent(eventType); 6197 return; 6198 } 6199 ViewParent parent = source.getParent(); 6200 if (parent instanceof View) { 6201 source = (View) parent; 6202 } else { 6203 return; 6204 } 6205 } 6206 } 6207 6208 /** 6209 * Clears accessibility focus without calling any callback methods 6210 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6211 * is used for clearing accessibility focus when giving this focus to 6212 * another view. 6213 */ 6214 void clearAccessibilityFocusNoCallbacks() { 6215 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6216 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6217 invalidate(); 6218 } 6219 } 6220 6221 /** 6222 * Call this to try to give focus to a specific view or to one of its 6223 * descendants. 6224 * 6225 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6226 * false), or if it is focusable and it is not focusable in touch mode 6227 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6228 * 6229 * See also {@link #focusSearch(int)}, which is what you call to say that you 6230 * have focus, and you want your parent to look for the next one. 6231 * 6232 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6233 * {@link #FOCUS_DOWN} and <code>null</code>. 6234 * 6235 * @return Whether this view or one of its descendants actually took focus. 6236 */ 6237 public final boolean requestFocus() { 6238 return requestFocus(View.FOCUS_DOWN); 6239 } 6240 6241 /** 6242 * Call this to try to give focus to a specific view or to one of its 6243 * descendants and give it a hint about what direction focus is heading. 6244 * 6245 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6246 * false), or if it is focusable and it is not focusable in touch mode 6247 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6248 * 6249 * See also {@link #focusSearch(int)}, which is what you call to say that you 6250 * have focus, and you want your parent to look for the next one. 6251 * 6252 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6253 * <code>null</code> set for the previously focused rectangle. 6254 * 6255 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6256 * @return Whether this view or one of its descendants actually took focus. 6257 */ 6258 public final boolean requestFocus(int direction) { 6259 return requestFocus(direction, null); 6260 } 6261 6262 /** 6263 * Call this to try to give focus to a specific view or to one of its descendants 6264 * and give it hints about the direction and a specific rectangle that the focus 6265 * is coming from. The rectangle can help give larger views a finer grained hint 6266 * about where focus is coming from, and therefore, where to show selection, or 6267 * forward focus change internally. 6268 * 6269 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6270 * false), or if it is focusable and it is not focusable in touch mode 6271 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6272 * 6273 * A View will not take focus if it is not visible. 6274 * 6275 * A View will not take focus if one of its parents has 6276 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6277 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6278 * 6279 * See also {@link #focusSearch(int)}, which is what you call to say that you 6280 * have focus, and you want your parent to look for the next one. 6281 * 6282 * You may wish to override this method if your custom {@link View} has an internal 6283 * {@link View} that it wishes to forward the request to. 6284 * 6285 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6286 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6287 * to give a finer grained hint about where focus is coming from. May be null 6288 * if there is no hint. 6289 * @return Whether this view or one of its descendants actually took focus. 6290 */ 6291 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6292 return requestFocusNoSearch(direction, previouslyFocusedRect); 6293 } 6294 6295 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6296 // need to be focusable 6297 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6298 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6299 return false; 6300 } 6301 6302 // need to be focusable in touch mode if in touch mode 6303 if (isInTouchMode() && 6304 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6305 return false; 6306 } 6307 6308 // need to not have any parents blocking us 6309 if (hasAncestorThatBlocksDescendantFocus()) { 6310 return false; 6311 } 6312 6313 handleFocusGainInternal(direction, previouslyFocusedRect); 6314 return true; 6315 } 6316 6317 /** 6318 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6319 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6320 * touch mode to request focus when they are touched. 6321 * 6322 * @return Whether this view or one of its descendants actually took focus. 6323 * 6324 * @see #isInTouchMode() 6325 * 6326 */ 6327 public final boolean requestFocusFromTouch() { 6328 // Leave touch mode if we need to 6329 if (isInTouchMode()) { 6330 ViewRootImpl viewRoot = getViewRootImpl(); 6331 if (viewRoot != null) { 6332 viewRoot.ensureTouchMode(false); 6333 } 6334 } 6335 return requestFocus(View.FOCUS_DOWN); 6336 } 6337 6338 /** 6339 * @return Whether any ancestor of this view blocks descendant focus. 6340 */ 6341 private boolean hasAncestorThatBlocksDescendantFocus() { 6342 ViewParent ancestor = mParent; 6343 while (ancestor instanceof ViewGroup) { 6344 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6345 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6346 return true; 6347 } else { 6348 ancestor = vgAncestor.getParent(); 6349 } 6350 } 6351 return false; 6352 } 6353 6354 /** 6355 * Gets the mode for determining whether this View is important for accessibility 6356 * which is if it fires accessibility events and if it is reported to 6357 * accessibility services that query the screen. 6358 * 6359 * @return The mode for determining whether a View is important for accessibility. 6360 * 6361 * @attr ref android.R.styleable#View_importantForAccessibility 6362 * 6363 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6364 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6365 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6366 */ 6367 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6368 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6369 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6370 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6371 }) 6372 public int getImportantForAccessibility() { 6373 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6374 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6375 } 6376 6377 /** 6378 * Sets how to determine whether this view is important for accessibility 6379 * which is if it fires accessibility events and if it is reported to 6380 * accessibility services that query the screen. 6381 * 6382 * @param mode How to determine whether this view is important for accessibility. 6383 * 6384 * @attr ref android.R.styleable#View_importantForAccessibility 6385 * 6386 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6387 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6388 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6389 */ 6390 public void setImportantForAccessibility(int mode) { 6391 if (mode != getImportantForAccessibility()) { 6392 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6393 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6394 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6395 notifyAccessibilityStateChanged(); 6396 } 6397 } 6398 6399 /** 6400 * Gets whether this view should be exposed for accessibility. 6401 * 6402 * @return Whether the view is exposed for accessibility. 6403 * 6404 * @hide 6405 */ 6406 public boolean isImportantForAccessibility() { 6407 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6408 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6409 switch (mode) { 6410 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6411 return true; 6412 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6413 return false; 6414 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6415 return isActionableForAccessibility() || hasListenersForAccessibility(); 6416 default: 6417 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6418 + mode); 6419 } 6420 } 6421 6422 /** 6423 * Gets the parent for accessibility purposes. Note that the parent for 6424 * accessibility is not necessary the immediate parent. It is the first 6425 * predecessor that is important for accessibility. 6426 * 6427 * @return The parent for accessibility purposes. 6428 */ 6429 public ViewParent getParentForAccessibility() { 6430 if (mParent instanceof View) { 6431 View parentView = (View) mParent; 6432 if (parentView.includeForAccessibility()) { 6433 return mParent; 6434 } else { 6435 return mParent.getParentForAccessibility(); 6436 } 6437 } 6438 return null; 6439 } 6440 6441 /** 6442 * Adds the children of a given View for accessibility. Since some Views are 6443 * not important for accessibility the children for accessibility are not 6444 * necessarily direct children of the riew, rather they are the first level of 6445 * descendants important for accessibility. 6446 * 6447 * @param children The list of children for accessibility. 6448 */ 6449 public void addChildrenForAccessibility(ArrayList<View> children) { 6450 if (includeForAccessibility()) { 6451 children.add(this); 6452 } 6453 } 6454 6455 /** 6456 * Whether to regard this view for accessibility. A view is regarded for 6457 * accessibility if it is important for accessibility or the querying 6458 * accessibility service has explicitly requested that view not 6459 * important for accessibility are regarded. 6460 * 6461 * @return Whether to regard the view for accessibility. 6462 * 6463 * @hide 6464 */ 6465 public boolean includeForAccessibility() { 6466 if (mAttachInfo != null) { 6467 if (!mAttachInfo.mIncludeNotImportantViews) { 6468 return isImportantForAccessibility(); 6469 } 6470 return true; 6471 } 6472 return false; 6473 } 6474 6475 /** 6476 * Returns whether the View is considered actionable from 6477 * accessibility perspective. Such view are important for 6478 * accessiiblity. 6479 * 6480 * @return True if the view is actionable for accessibility. 6481 * 6482 * @hide 6483 */ 6484 public boolean isActionableForAccessibility() { 6485 return (isClickable() || isLongClickable() || isFocusable()); 6486 } 6487 6488 /** 6489 * Returns whether the View has registered callbacks wich makes it 6490 * important for accessiiblity. 6491 * 6492 * @return True if the view is actionable for accessibility. 6493 */ 6494 private boolean hasListenersForAccessibility() { 6495 ListenerInfo info = getListenerInfo(); 6496 return mTouchDelegate != null || info.mOnKeyListener != null 6497 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6498 || info.mOnHoverListener != null || info.mOnDragListener != null; 6499 } 6500 6501 /** 6502 * Notifies accessibility services that some view's important for 6503 * accessibility state has changed. Note that such notifications 6504 * are made at most once every 6505 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6506 * to avoid unnecessary load to the system. Also once a view has 6507 * made a notifucation this method is a NOP until the notification has 6508 * been sent to clients. 6509 * 6510 * @hide 6511 * 6512 * TODO: Makse sure this method is called for any view state change 6513 * that is interesting for accessilility purposes. 6514 */ 6515 public void notifyAccessibilityStateChanged() { 6516 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6517 return; 6518 } 6519 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6520 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6521 if (mParent != null) { 6522 mParent.childAccessibilityStateChanged(this); 6523 } 6524 } 6525 } 6526 6527 /** 6528 * Reset the state indicating the this view has requested clients 6529 * interested in its accessiblity state to be notified. 6530 * 6531 * @hide 6532 */ 6533 public void resetAccessibilityStateChanged() { 6534 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6535 } 6536 6537 /** 6538 * Performs the specified accessibility action on the view. For 6539 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6540 * <p> 6541 * If an {@link AccessibilityDelegate} has been specified via calling 6542 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6543 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6544 * is responsible for handling this call. 6545 * </p> 6546 * 6547 * @param action The action to perform. 6548 * @param arguments Optional action arguments. 6549 * @return Whether the action was performed. 6550 */ 6551 public boolean performAccessibilityAction(int action, Bundle arguments) { 6552 if (mAccessibilityDelegate != null) { 6553 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6554 } else { 6555 return performAccessibilityActionInternal(action, arguments); 6556 } 6557 } 6558 6559 /** 6560 * @see #performAccessibilityAction(int, Bundle) 6561 * 6562 * Note: Called from the default {@link AccessibilityDelegate}. 6563 */ 6564 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6565 switch (action) { 6566 case AccessibilityNodeInfo.ACTION_CLICK: { 6567 if (isClickable()) { 6568 return performClick(); 6569 } 6570 } break; 6571 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6572 if (isLongClickable()) { 6573 return performLongClick(); 6574 } 6575 } break; 6576 case AccessibilityNodeInfo.ACTION_FOCUS: { 6577 if (!hasFocus()) { 6578 // Get out of touch mode since accessibility 6579 // wants to move focus around. 6580 getViewRootImpl().ensureTouchMode(false); 6581 return requestFocus(); 6582 } 6583 } break; 6584 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6585 if (hasFocus()) { 6586 clearFocus(); 6587 return !isFocused(); 6588 } 6589 } break; 6590 case AccessibilityNodeInfo.ACTION_SELECT: { 6591 if (!isSelected()) { 6592 setSelected(true); 6593 return isSelected(); 6594 } 6595 } break; 6596 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6597 if (isSelected()) { 6598 setSelected(false); 6599 return !isSelected(); 6600 } 6601 } break; 6602 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6603 if (!isAccessibilityFocused()) { 6604 return requestAccessibilityFocus(); 6605 } 6606 } break; 6607 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6608 if (isAccessibilityFocused()) { 6609 clearAccessibilityFocus(); 6610 return true; 6611 } 6612 } break; 6613 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6614 if (arguments != null) { 6615 final int granularity = arguments.getInt( 6616 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6617 return nextAtGranularity(granularity); 6618 } 6619 } break; 6620 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6621 if (arguments != null) { 6622 final int granularity = arguments.getInt( 6623 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6624 return previousAtGranularity(granularity); 6625 } 6626 } break; 6627 } 6628 return false; 6629 } 6630 6631 private boolean nextAtGranularity(int granularity) { 6632 CharSequence text = getIterableTextForAccessibility(); 6633 if (text == null || text.length() == 0) { 6634 return false; 6635 } 6636 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6637 if (iterator == null) { 6638 return false; 6639 } 6640 final int current = getAccessibilityCursorPosition(); 6641 final int[] range = iterator.following(current); 6642 if (range == null) { 6643 return false; 6644 } 6645 final int start = range[0]; 6646 final int end = range[1]; 6647 setAccessibilityCursorPosition(end); 6648 sendViewTextTraversedAtGranularityEvent( 6649 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6650 granularity, start, end); 6651 return true; 6652 } 6653 6654 private boolean previousAtGranularity(int granularity) { 6655 CharSequence text = getIterableTextForAccessibility(); 6656 if (text == null || text.length() == 0) { 6657 return false; 6658 } 6659 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6660 if (iterator == null) { 6661 return false; 6662 } 6663 int current = getAccessibilityCursorPosition(); 6664 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 6665 current = text.length(); 6666 } else if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6667 // When traversing by character we always put the cursor after the character 6668 // to ease edit and have to compensate before asking the for previous segment. 6669 current--; 6670 } 6671 final int[] range = iterator.preceding(current); 6672 if (range == null) { 6673 return false; 6674 } 6675 final int start = range[0]; 6676 final int end = range[1]; 6677 // Always put the cursor after the character to ease edit. 6678 if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6679 setAccessibilityCursorPosition(end); 6680 } else { 6681 setAccessibilityCursorPosition(start); 6682 } 6683 sendViewTextTraversedAtGranularityEvent( 6684 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6685 granularity, start, end); 6686 return true; 6687 } 6688 6689 /** 6690 * Gets the text reported for accessibility purposes. 6691 * 6692 * @return The accessibility text. 6693 * 6694 * @hide 6695 */ 6696 public CharSequence getIterableTextForAccessibility() { 6697 return mContentDescription; 6698 } 6699 6700 /** 6701 * @hide 6702 */ 6703 public int getAccessibilityCursorPosition() { 6704 return mAccessibilityCursorPosition; 6705 } 6706 6707 /** 6708 * @hide 6709 */ 6710 public void setAccessibilityCursorPosition(int position) { 6711 mAccessibilityCursorPosition = position; 6712 } 6713 6714 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6715 int fromIndex, int toIndex) { 6716 if (mParent == null) { 6717 return; 6718 } 6719 AccessibilityEvent event = AccessibilityEvent.obtain( 6720 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6721 onInitializeAccessibilityEvent(event); 6722 onPopulateAccessibilityEvent(event); 6723 event.setFromIndex(fromIndex); 6724 event.setToIndex(toIndex); 6725 event.setAction(action); 6726 event.setMovementGranularity(granularity); 6727 mParent.requestSendAccessibilityEvent(this, event); 6728 } 6729 6730 /** 6731 * @hide 6732 */ 6733 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6734 switch (granularity) { 6735 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6736 CharSequence text = getIterableTextForAccessibility(); 6737 if (text != null && text.length() > 0) { 6738 CharacterTextSegmentIterator iterator = 6739 CharacterTextSegmentIterator.getInstance( 6740 mContext.getResources().getConfiguration().locale); 6741 iterator.initialize(text.toString()); 6742 return iterator; 6743 } 6744 } break; 6745 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6746 CharSequence text = getIterableTextForAccessibility(); 6747 if (text != null && text.length() > 0) { 6748 WordTextSegmentIterator iterator = 6749 WordTextSegmentIterator.getInstance( 6750 mContext.getResources().getConfiguration().locale); 6751 iterator.initialize(text.toString()); 6752 return iterator; 6753 } 6754 } break; 6755 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6756 CharSequence text = getIterableTextForAccessibility(); 6757 if (text != null && text.length() > 0) { 6758 ParagraphTextSegmentIterator iterator = 6759 ParagraphTextSegmentIterator.getInstance(); 6760 iterator.initialize(text.toString()); 6761 return iterator; 6762 } 6763 } break; 6764 } 6765 return null; 6766 } 6767 6768 /** 6769 * @hide 6770 */ 6771 public void dispatchStartTemporaryDetach() { 6772 clearAccessibilityFocus(); 6773 clearDisplayList(); 6774 6775 onStartTemporaryDetach(); 6776 } 6777 6778 /** 6779 * This is called when a container is going to temporarily detach a child, with 6780 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6781 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6782 * {@link #onDetachedFromWindow()} when the container is done. 6783 */ 6784 public void onStartTemporaryDetach() { 6785 removeUnsetPressCallback(); 6786 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6787 } 6788 6789 /** 6790 * @hide 6791 */ 6792 public void dispatchFinishTemporaryDetach() { 6793 onFinishTemporaryDetach(); 6794 } 6795 6796 /** 6797 * Called after {@link #onStartTemporaryDetach} when the container is done 6798 * changing the view. 6799 */ 6800 public void onFinishTemporaryDetach() { 6801 } 6802 6803 /** 6804 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6805 * for this view's window. Returns null if the view is not currently attached 6806 * to the window. Normally you will not need to use this directly, but 6807 * just use the standard high-level event callbacks like 6808 * {@link #onKeyDown(int, KeyEvent)}. 6809 */ 6810 public KeyEvent.DispatcherState getKeyDispatcherState() { 6811 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6812 } 6813 6814 /** 6815 * Dispatch a key event before it is processed by any input method 6816 * associated with the view hierarchy. This can be used to intercept 6817 * key events in special situations before the IME consumes them; a 6818 * typical example would be handling the BACK key to update the application's 6819 * UI instead of allowing the IME to see it and close itself. 6820 * 6821 * @param event The key event to be dispatched. 6822 * @return True if the event was handled, false otherwise. 6823 */ 6824 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6825 return onKeyPreIme(event.getKeyCode(), event); 6826 } 6827 6828 /** 6829 * Dispatch a key event to the next view on the focus path. This path runs 6830 * from the top of the view tree down to the currently focused view. If this 6831 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6832 * the next node down the focus path. This method also fires any key 6833 * listeners. 6834 * 6835 * @param event The key event to be dispatched. 6836 * @return True if the event was handled, false otherwise. 6837 */ 6838 public boolean dispatchKeyEvent(KeyEvent event) { 6839 if (mInputEventConsistencyVerifier != null) { 6840 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6841 } 6842 6843 // Give any attached key listener a first crack at the event. 6844 //noinspection SimplifiableIfStatement 6845 ListenerInfo li = mListenerInfo; 6846 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6847 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6848 return true; 6849 } 6850 6851 if (event.dispatch(this, mAttachInfo != null 6852 ? mAttachInfo.mKeyDispatchState : null, this)) { 6853 return true; 6854 } 6855 6856 if (mInputEventConsistencyVerifier != null) { 6857 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6858 } 6859 return false; 6860 } 6861 6862 /** 6863 * Dispatches a key shortcut event. 6864 * 6865 * @param event The key event to be dispatched. 6866 * @return True if the event was handled by the view, false otherwise. 6867 */ 6868 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6869 return onKeyShortcut(event.getKeyCode(), event); 6870 } 6871 6872 /** 6873 * Pass the touch screen motion event down to the target view, or this 6874 * view if it is the target. 6875 * 6876 * @param event The motion event to be dispatched. 6877 * @return True if the event was handled by the view, false otherwise. 6878 */ 6879 public boolean dispatchTouchEvent(MotionEvent event) { 6880 if (mInputEventConsistencyVerifier != null) { 6881 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6882 } 6883 6884 if (onFilterTouchEventForSecurity(event)) { 6885 //noinspection SimplifiableIfStatement 6886 ListenerInfo li = mListenerInfo; 6887 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6888 && li.mOnTouchListener.onTouch(this, event)) { 6889 return true; 6890 } 6891 6892 if (onTouchEvent(event)) { 6893 return true; 6894 } 6895 } 6896 6897 if (mInputEventConsistencyVerifier != null) { 6898 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6899 } 6900 return false; 6901 } 6902 6903 /** 6904 * Filter the touch event to apply security policies. 6905 * 6906 * @param event The motion event to be filtered. 6907 * @return True if the event should be dispatched, false if the event should be dropped. 6908 * 6909 * @see #getFilterTouchesWhenObscured 6910 */ 6911 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6912 //noinspection RedundantIfStatement 6913 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6914 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6915 // Window is obscured, drop this touch. 6916 return false; 6917 } 6918 return true; 6919 } 6920 6921 /** 6922 * Pass a trackball motion event down to the focused view. 6923 * 6924 * @param event The motion event to be dispatched. 6925 * @return True if the event was handled by the view, false otherwise. 6926 */ 6927 public boolean dispatchTrackballEvent(MotionEvent event) { 6928 if (mInputEventConsistencyVerifier != null) { 6929 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6930 } 6931 6932 return onTrackballEvent(event); 6933 } 6934 6935 /** 6936 * Dispatch a generic motion event. 6937 * <p> 6938 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6939 * are delivered to the view under the pointer. All other generic motion events are 6940 * delivered to the focused view. Hover events are handled specially and are delivered 6941 * to {@link #onHoverEvent(MotionEvent)}. 6942 * </p> 6943 * 6944 * @param event The motion event to be dispatched. 6945 * @return True if the event was handled by the view, false otherwise. 6946 */ 6947 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6948 if (mInputEventConsistencyVerifier != null) { 6949 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6950 } 6951 6952 final int source = event.getSource(); 6953 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6954 final int action = event.getAction(); 6955 if (action == MotionEvent.ACTION_HOVER_ENTER 6956 || action == MotionEvent.ACTION_HOVER_MOVE 6957 || action == MotionEvent.ACTION_HOVER_EXIT) { 6958 if (dispatchHoverEvent(event)) { 6959 return true; 6960 } 6961 } else if (dispatchGenericPointerEvent(event)) { 6962 return true; 6963 } 6964 } else if (dispatchGenericFocusedEvent(event)) { 6965 return true; 6966 } 6967 6968 if (dispatchGenericMotionEventInternal(event)) { 6969 return true; 6970 } 6971 6972 if (mInputEventConsistencyVerifier != null) { 6973 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6974 } 6975 return false; 6976 } 6977 6978 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6979 //noinspection SimplifiableIfStatement 6980 ListenerInfo li = mListenerInfo; 6981 if (li != null && li.mOnGenericMotionListener != null 6982 && (mViewFlags & ENABLED_MASK) == ENABLED 6983 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6984 return true; 6985 } 6986 6987 if (onGenericMotionEvent(event)) { 6988 return true; 6989 } 6990 6991 if (mInputEventConsistencyVerifier != null) { 6992 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6993 } 6994 return false; 6995 } 6996 6997 /** 6998 * Dispatch a hover event. 6999 * <p> 7000 * Do not call this method directly. 7001 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7002 * </p> 7003 * 7004 * @param event The motion event to be dispatched. 7005 * @return True if the event was handled by the view, false otherwise. 7006 */ 7007 protected boolean dispatchHoverEvent(MotionEvent event) { 7008 //noinspection SimplifiableIfStatement 7009 ListenerInfo li = mListenerInfo; 7010 if (li != null && li.mOnHoverListener != null 7011 && (mViewFlags & ENABLED_MASK) == ENABLED 7012 && li.mOnHoverListener.onHover(this, event)) { 7013 return true; 7014 } 7015 7016 return onHoverEvent(event); 7017 } 7018 7019 /** 7020 * Returns true if the view has a child to which it has recently sent 7021 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7022 * it does not have a hovered child, then it must be the innermost hovered view. 7023 * @hide 7024 */ 7025 protected boolean hasHoveredChild() { 7026 return false; 7027 } 7028 7029 /** 7030 * Dispatch a generic motion event to the view under the first pointer. 7031 * <p> 7032 * Do not call this method directly. 7033 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7034 * </p> 7035 * 7036 * @param event The motion event to be dispatched. 7037 * @return True if the event was handled by the view, false otherwise. 7038 */ 7039 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7040 return false; 7041 } 7042 7043 /** 7044 * Dispatch a generic motion event to the currently focused view. 7045 * <p> 7046 * Do not call this method directly. 7047 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7048 * </p> 7049 * 7050 * @param event The motion event to be dispatched. 7051 * @return True if the event was handled by the view, false otherwise. 7052 */ 7053 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7054 return false; 7055 } 7056 7057 /** 7058 * Dispatch a pointer event. 7059 * <p> 7060 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7061 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7062 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7063 * and should not be expected to handle other pointing device features. 7064 * </p> 7065 * 7066 * @param event The motion event to be dispatched. 7067 * @return True if the event was handled by the view, false otherwise. 7068 * @hide 7069 */ 7070 public final boolean dispatchPointerEvent(MotionEvent event) { 7071 if (event.isTouchEvent()) { 7072 return dispatchTouchEvent(event); 7073 } else { 7074 return dispatchGenericMotionEvent(event); 7075 } 7076 } 7077 7078 /** 7079 * Called when the window containing this view gains or loses window focus. 7080 * ViewGroups should override to route to their children. 7081 * 7082 * @param hasFocus True if the window containing this view now has focus, 7083 * false otherwise. 7084 */ 7085 public void dispatchWindowFocusChanged(boolean hasFocus) { 7086 onWindowFocusChanged(hasFocus); 7087 } 7088 7089 /** 7090 * Called when the window containing this view gains or loses focus. Note 7091 * that this is separate from view focus: to receive key events, both 7092 * your view and its window must have focus. If a window is displayed 7093 * on top of yours that takes input focus, then your own window will lose 7094 * focus but the view focus will remain unchanged. 7095 * 7096 * @param hasWindowFocus True if the window containing this view now has 7097 * focus, false otherwise. 7098 */ 7099 public void onWindowFocusChanged(boolean hasWindowFocus) { 7100 InputMethodManager imm = InputMethodManager.peekInstance(); 7101 if (!hasWindowFocus) { 7102 if (isPressed()) { 7103 setPressed(false); 7104 } 7105 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7106 imm.focusOut(this); 7107 } 7108 removeLongPressCallback(); 7109 removeTapCallback(); 7110 onFocusLost(); 7111 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7112 imm.focusIn(this); 7113 } 7114 refreshDrawableState(); 7115 } 7116 7117 /** 7118 * Returns true if this view is in a window that currently has window focus. 7119 * Note that this is not the same as the view itself having focus. 7120 * 7121 * @return True if this view is in a window that currently has window focus. 7122 */ 7123 public boolean hasWindowFocus() { 7124 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7125 } 7126 7127 /** 7128 * Dispatch a view visibility change down the view hierarchy. 7129 * ViewGroups should override to route to their children. 7130 * @param changedView The view whose visibility changed. Could be 'this' or 7131 * an ancestor view. 7132 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7133 * {@link #INVISIBLE} or {@link #GONE}. 7134 */ 7135 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7136 onVisibilityChanged(changedView, visibility); 7137 } 7138 7139 /** 7140 * Called when the visibility of the view or an ancestor of the view is changed. 7141 * @param changedView The view whose visibility changed. Could be 'this' or 7142 * an ancestor view. 7143 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7144 * {@link #INVISIBLE} or {@link #GONE}. 7145 */ 7146 protected void onVisibilityChanged(View changedView, int visibility) { 7147 if (visibility == VISIBLE) { 7148 if (mAttachInfo != null) { 7149 initialAwakenScrollBars(); 7150 } else { 7151 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7152 } 7153 } 7154 } 7155 7156 /** 7157 * Dispatch a hint about whether this view is displayed. For instance, when 7158 * a View moves out of the screen, it might receives a display hint indicating 7159 * the view is not displayed. Applications should not <em>rely</em> on this hint 7160 * as there is no guarantee that they will receive one. 7161 * 7162 * @param hint A hint about whether or not this view is displayed: 7163 * {@link #VISIBLE} or {@link #INVISIBLE}. 7164 */ 7165 public void dispatchDisplayHint(int hint) { 7166 onDisplayHint(hint); 7167 } 7168 7169 /** 7170 * Gives this view a hint about whether is displayed or not. For instance, when 7171 * a View moves out of the screen, it might receives a display hint indicating 7172 * the view is not displayed. Applications should not <em>rely</em> on this hint 7173 * as there is no guarantee that they will receive one. 7174 * 7175 * @param hint A hint about whether or not this view is displayed: 7176 * {@link #VISIBLE} or {@link #INVISIBLE}. 7177 */ 7178 protected void onDisplayHint(int hint) { 7179 } 7180 7181 /** 7182 * Dispatch a window visibility change down the view hierarchy. 7183 * ViewGroups should override to route to their children. 7184 * 7185 * @param visibility The new visibility of the window. 7186 * 7187 * @see #onWindowVisibilityChanged(int) 7188 */ 7189 public void dispatchWindowVisibilityChanged(int visibility) { 7190 onWindowVisibilityChanged(visibility); 7191 } 7192 7193 /** 7194 * Called when the window containing has change its visibility 7195 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7196 * that this tells you whether or not your window is being made visible 7197 * to the window manager; this does <em>not</em> tell you whether or not 7198 * your window is obscured by other windows on the screen, even if it 7199 * is itself visible. 7200 * 7201 * @param visibility The new visibility of the window. 7202 */ 7203 protected void onWindowVisibilityChanged(int visibility) { 7204 if (visibility == VISIBLE) { 7205 initialAwakenScrollBars(); 7206 } 7207 } 7208 7209 /** 7210 * Returns the current visibility of the window this view is attached to 7211 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7212 * 7213 * @return Returns the current visibility of the view's window. 7214 */ 7215 public int getWindowVisibility() { 7216 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7217 } 7218 7219 /** 7220 * Retrieve the overall visible display size in which the window this view is 7221 * attached to has been positioned in. This takes into account screen 7222 * decorations above the window, for both cases where the window itself 7223 * is being position inside of them or the window is being placed under 7224 * then and covered insets are used for the window to position its content 7225 * inside. In effect, this tells you the available area where content can 7226 * be placed and remain visible to users. 7227 * 7228 * <p>This function requires an IPC back to the window manager to retrieve 7229 * the requested information, so should not be used in performance critical 7230 * code like drawing. 7231 * 7232 * @param outRect Filled in with the visible display frame. If the view 7233 * is not attached to a window, this is simply the raw display size. 7234 */ 7235 public void getWindowVisibleDisplayFrame(Rect outRect) { 7236 if (mAttachInfo != null) { 7237 try { 7238 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7239 } catch (RemoteException e) { 7240 return; 7241 } 7242 // XXX This is really broken, and probably all needs to be done 7243 // in the window manager, and we need to know more about whether 7244 // we want the area behind or in front of the IME. 7245 final Rect insets = mAttachInfo.mVisibleInsets; 7246 outRect.left += insets.left; 7247 outRect.top += insets.top; 7248 outRect.right -= insets.right; 7249 outRect.bottom -= insets.bottom; 7250 return; 7251 } 7252 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7253 d.getRectSize(outRect); 7254 } 7255 7256 /** 7257 * Dispatch a notification about a resource configuration change down 7258 * the view hierarchy. 7259 * ViewGroups should override to route to their children. 7260 * 7261 * @param newConfig The new resource configuration. 7262 * 7263 * @see #onConfigurationChanged(android.content.res.Configuration) 7264 */ 7265 public void dispatchConfigurationChanged(Configuration newConfig) { 7266 onConfigurationChanged(newConfig); 7267 } 7268 7269 /** 7270 * Called when the current configuration of the resources being used 7271 * by the application have changed. You can use this to decide when 7272 * to reload resources that can changed based on orientation and other 7273 * configuration characterstics. You only need to use this if you are 7274 * not relying on the normal {@link android.app.Activity} mechanism of 7275 * recreating the activity instance upon a configuration change. 7276 * 7277 * @param newConfig The new resource configuration. 7278 */ 7279 protected void onConfigurationChanged(Configuration newConfig) { 7280 } 7281 7282 /** 7283 * Private function to aggregate all per-view attributes in to the view 7284 * root. 7285 */ 7286 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7287 performCollectViewAttributes(attachInfo, visibility); 7288 } 7289 7290 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7291 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7292 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7293 attachInfo.mKeepScreenOn = true; 7294 } 7295 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7296 ListenerInfo li = mListenerInfo; 7297 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7298 attachInfo.mHasSystemUiListeners = true; 7299 } 7300 } 7301 } 7302 7303 void needGlobalAttributesUpdate(boolean force) { 7304 final AttachInfo ai = mAttachInfo; 7305 if (ai != null) { 7306 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7307 || ai.mHasSystemUiListeners) { 7308 ai.mRecomputeGlobalAttributes = true; 7309 } 7310 } 7311 } 7312 7313 /** 7314 * Returns whether the device is currently in touch mode. Touch mode is entered 7315 * once the user begins interacting with the device by touch, and affects various 7316 * things like whether focus is always visible to the user. 7317 * 7318 * @return Whether the device is in touch mode. 7319 */ 7320 @ViewDebug.ExportedProperty 7321 public boolean isInTouchMode() { 7322 if (mAttachInfo != null) { 7323 return mAttachInfo.mInTouchMode; 7324 } else { 7325 return ViewRootImpl.isInTouchMode(); 7326 } 7327 } 7328 7329 /** 7330 * Returns the context the view is running in, through which it can 7331 * access the current theme, resources, etc. 7332 * 7333 * @return The view's Context. 7334 */ 7335 @ViewDebug.CapturedViewProperty 7336 public final Context getContext() { 7337 return mContext; 7338 } 7339 7340 /** 7341 * Handle a key event before it is processed by any input method 7342 * associated with the view hierarchy. This can be used to intercept 7343 * key events in special situations before the IME consumes them; a 7344 * typical example would be handling the BACK key to update the application's 7345 * UI instead of allowing the IME to see it and close itself. 7346 * 7347 * @param keyCode The value in event.getKeyCode(). 7348 * @param event Description of the key event. 7349 * @return If you handled the event, return true. If you want to allow the 7350 * event to be handled by the next receiver, return false. 7351 */ 7352 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7353 return false; 7354 } 7355 7356 /** 7357 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7358 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7359 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7360 * is released, if the view is enabled and clickable. 7361 * 7362 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7363 * although some may elect to do so in some situations. Do not rely on this to 7364 * catch software key presses. 7365 * 7366 * @param keyCode A key code that represents the button pressed, from 7367 * {@link android.view.KeyEvent}. 7368 * @param event The KeyEvent object that defines the button action. 7369 */ 7370 public boolean onKeyDown(int keyCode, KeyEvent event) { 7371 boolean result = false; 7372 7373 switch (keyCode) { 7374 case KeyEvent.KEYCODE_DPAD_CENTER: 7375 case KeyEvent.KEYCODE_ENTER: { 7376 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7377 return true; 7378 } 7379 // Long clickable items don't necessarily have to be clickable 7380 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7381 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7382 (event.getRepeatCount() == 0)) { 7383 setPressed(true); 7384 checkForLongClick(0); 7385 return true; 7386 } 7387 break; 7388 } 7389 } 7390 return result; 7391 } 7392 7393 /** 7394 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7395 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7396 * the event). 7397 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7398 * although some may elect to do so in some situations. Do not rely on this to 7399 * catch software key presses. 7400 */ 7401 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7402 return false; 7403 } 7404 7405 /** 7406 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7407 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7408 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7409 * {@link KeyEvent#KEYCODE_ENTER} is released. 7410 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7411 * although some may elect to do so in some situations. Do not rely on this to 7412 * catch software key presses. 7413 * 7414 * @param keyCode A key code that represents the button pressed, from 7415 * {@link android.view.KeyEvent}. 7416 * @param event The KeyEvent object that defines the button action. 7417 */ 7418 public boolean onKeyUp(int keyCode, KeyEvent event) { 7419 boolean result = false; 7420 7421 switch (keyCode) { 7422 case KeyEvent.KEYCODE_DPAD_CENTER: 7423 case KeyEvent.KEYCODE_ENTER: { 7424 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7425 return true; 7426 } 7427 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7428 setPressed(false); 7429 7430 if (!mHasPerformedLongPress) { 7431 // This is a tap, so remove the longpress check 7432 removeLongPressCallback(); 7433 7434 result = performClick(); 7435 } 7436 } 7437 break; 7438 } 7439 } 7440 return result; 7441 } 7442 7443 /** 7444 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7445 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7446 * the event). 7447 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7448 * although some may elect to do so in some situations. Do not rely on this to 7449 * catch software key presses. 7450 * 7451 * @param keyCode A key code that represents the button pressed, from 7452 * {@link android.view.KeyEvent}. 7453 * @param repeatCount The number of times the action was made. 7454 * @param event The KeyEvent object that defines the button action. 7455 */ 7456 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7457 return false; 7458 } 7459 7460 /** 7461 * Called on the focused view when a key shortcut event is not handled. 7462 * Override this method to implement local key shortcuts for the View. 7463 * Key shortcuts can also be implemented by setting the 7464 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7465 * 7466 * @param keyCode The value in event.getKeyCode(). 7467 * @param event Description of the key event. 7468 * @return If you handled the event, return true. If you want to allow the 7469 * event to be handled by the next receiver, return false. 7470 */ 7471 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7472 return false; 7473 } 7474 7475 /** 7476 * Check whether the called view is a text editor, in which case it 7477 * would make sense to automatically display a soft input window for 7478 * it. Subclasses should override this if they implement 7479 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7480 * a call on that method would return a non-null InputConnection, and 7481 * they are really a first-class editor that the user would normally 7482 * start typing on when the go into a window containing your view. 7483 * 7484 * <p>The default implementation always returns false. This does 7485 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7486 * will not be called or the user can not otherwise perform edits on your 7487 * view; it is just a hint to the system that this is not the primary 7488 * purpose of this view. 7489 * 7490 * @return Returns true if this view is a text editor, else false. 7491 */ 7492 public boolean onCheckIsTextEditor() { 7493 return false; 7494 } 7495 7496 /** 7497 * Create a new InputConnection for an InputMethod to interact 7498 * with the view. The default implementation returns null, since it doesn't 7499 * support input methods. You can override this to implement such support. 7500 * This is only needed for views that take focus and text input. 7501 * 7502 * <p>When implementing this, you probably also want to implement 7503 * {@link #onCheckIsTextEditor()} to indicate you will return a 7504 * non-null InputConnection. 7505 * 7506 * @param outAttrs Fill in with attribute information about the connection. 7507 */ 7508 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7509 return null; 7510 } 7511 7512 /** 7513 * Called by the {@link android.view.inputmethod.InputMethodManager} 7514 * when a view who is not the current 7515 * input connection target is trying to make a call on the manager. The 7516 * default implementation returns false; you can override this to return 7517 * true for certain views if you are performing InputConnection proxying 7518 * to them. 7519 * @param view The View that is making the InputMethodManager call. 7520 * @return Return true to allow the call, false to reject. 7521 */ 7522 public boolean checkInputConnectionProxy(View view) { 7523 return false; 7524 } 7525 7526 /** 7527 * Show the context menu for this view. It is not safe to hold on to the 7528 * menu after returning from this method. 7529 * 7530 * You should normally not overload this method. Overload 7531 * {@link #onCreateContextMenu(ContextMenu)} or define an 7532 * {@link OnCreateContextMenuListener} to add items to the context menu. 7533 * 7534 * @param menu The context menu to populate 7535 */ 7536 public void createContextMenu(ContextMenu menu) { 7537 ContextMenuInfo menuInfo = getContextMenuInfo(); 7538 7539 // Sets the current menu info so all items added to menu will have 7540 // my extra info set. 7541 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7542 7543 onCreateContextMenu(menu); 7544 ListenerInfo li = mListenerInfo; 7545 if (li != null && li.mOnCreateContextMenuListener != null) { 7546 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7547 } 7548 7549 // Clear the extra information so subsequent items that aren't mine don't 7550 // have my extra info. 7551 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7552 7553 if (mParent != null) { 7554 mParent.createContextMenu(menu); 7555 } 7556 } 7557 7558 /** 7559 * Views should implement this if they have extra information to associate 7560 * with the context menu. The return result is supplied as a parameter to 7561 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7562 * callback. 7563 * 7564 * @return Extra information about the item for which the context menu 7565 * should be shown. This information will vary across different 7566 * subclasses of View. 7567 */ 7568 protected ContextMenuInfo getContextMenuInfo() { 7569 return null; 7570 } 7571 7572 /** 7573 * Views should implement this if the view itself is going to add items to 7574 * the context menu. 7575 * 7576 * @param menu the context menu to populate 7577 */ 7578 protected void onCreateContextMenu(ContextMenu menu) { 7579 } 7580 7581 /** 7582 * Implement this method to handle trackball motion events. The 7583 * <em>relative</em> movement of the trackball since the last event 7584 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7585 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7586 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7587 * they will often be fractional values, representing the more fine-grained 7588 * movement information available from a trackball). 7589 * 7590 * @param event The motion event. 7591 * @return True if the event was handled, false otherwise. 7592 */ 7593 public boolean onTrackballEvent(MotionEvent event) { 7594 return false; 7595 } 7596 7597 /** 7598 * Implement this method to handle generic motion events. 7599 * <p> 7600 * Generic motion events describe joystick movements, mouse hovers, track pad 7601 * touches, scroll wheel movements and other input events. The 7602 * {@link MotionEvent#getSource() source} of the motion event specifies 7603 * the class of input that was received. Implementations of this method 7604 * must examine the bits in the source before processing the event. 7605 * The following code example shows how this is done. 7606 * </p><p> 7607 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7608 * are delivered to the view under the pointer. All other generic motion events are 7609 * delivered to the focused view. 7610 * </p> 7611 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7612 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7613 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7614 * // process the joystick movement... 7615 * return true; 7616 * } 7617 * } 7618 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7619 * switch (event.getAction()) { 7620 * case MotionEvent.ACTION_HOVER_MOVE: 7621 * // process the mouse hover movement... 7622 * return true; 7623 * case MotionEvent.ACTION_SCROLL: 7624 * // process the scroll wheel movement... 7625 * return true; 7626 * } 7627 * } 7628 * return super.onGenericMotionEvent(event); 7629 * }</pre> 7630 * 7631 * @param event The generic motion event being processed. 7632 * @return True if the event was handled, false otherwise. 7633 */ 7634 public boolean onGenericMotionEvent(MotionEvent event) { 7635 return false; 7636 } 7637 7638 /** 7639 * Implement this method to handle hover events. 7640 * <p> 7641 * This method is called whenever a pointer is hovering into, over, or out of the 7642 * bounds of a view and the view is not currently being touched. 7643 * Hover events are represented as pointer events with action 7644 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7645 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7646 * </p> 7647 * <ul> 7648 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7649 * when the pointer enters the bounds of the view.</li> 7650 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7651 * when the pointer has already entered the bounds of the view and has moved.</li> 7652 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7653 * when the pointer has exited the bounds of the view or when the pointer is 7654 * about to go down due to a button click, tap, or similar user action that 7655 * causes the view to be touched.</li> 7656 * </ul> 7657 * <p> 7658 * The view should implement this method to return true to indicate that it is 7659 * handling the hover event, such as by changing its drawable state. 7660 * </p><p> 7661 * The default implementation calls {@link #setHovered} to update the hovered state 7662 * of the view when a hover enter or hover exit event is received, if the view 7663 * is enabled and is clickable. The default implementation also sends hover 7664 * accessibility events. 7665 * </p> 7666 * 7667 * @param event The motion event that describes the hover. 7668 * @return True if the view handled the hover event. 7669 * 7670 * @see #isHovered 7671 * @see #setHovered 7672 * @see #onHoverChanged 7673 */ 7674 public boolean onHoverEvent(MotionEvent event) { 7675 // The root view may receive hover (or touch) events that are outside the bounds of 7676 // the window. This code ensures that we only send accessibility events for 7677 // hovers that are actually within the bounds of the root view. 7678 final int action = event.getActionMasked(); 7679 if (!mSendingHoverAccessibilityEvents) { 7680 if ((action == MotionEvent.ACTION_HOVER_ENTER 7681 || action == MotionEvent.ACTION_HOVER_MOVE) 7682 && !hasHoveredChild() 7683 && pointInView(event.getX(), event.getY())) { 7684 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7685 mSendingHoverAccessibilityEvents = true; 7686 } 7687 } else { 7688 if (action == MotionEvent.ACTION_HOVER_EXIT 7689 || (action == MotionEvent.ACTION_MOVE 7690 && !pointInView(event.getX(), event.getY()))) { 7691 mSendingHoverAccessibilityEvents = false; 7692 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7693 // If the window does not have input focus we take away accessibility 7694 // focus as soon as the user stop hovering over the view. 7695 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7696 getViewRootImpl().setAccessibilityFocus(null, null); 7697 } 7698 } 7699 } 7700 7701 if (isHoverable()) { 7702 switch (action) { 7703 case MotionEvent.ACTION_HOVER_ENTER: 7704 setHovered(true); 7705 break; 7706 case MotionEvent.ACTION_HOVER_EXIT: 7707 setHovered(false); 7708 break; 7709 } 7710 7711 // Dispatch the event to onGenericMotionEvent before returning true. 7712 // This is to provide compatibility with existing applications that 7713 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7714 // break because of the new default handling for hoverable views 7715 // in onHoverEvent. 7716 // Note that onGenericMotionEvent will be called by default when 7717 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7718 dispatchGenericMotionEventInternal(event); 7719 return true; 7720 } 7721 7722 return false; 7723 } 7724 7725 /** 7726 * Returns true if the view should handle {@link #onHoverEvent} 7727 * by calling {@link #setHovered} to change its hovered state. 7728 * 7729 * @return True if the view is hoverable. 7730 */ 7731 private boolean isHoverable() { 7732 final int viewFlags = mViewFlags; 7733 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7734 return false; 7735 } 7736 7737 return (viewFlags & CLICKABLE) == CLICKABLE 7738 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7739 } 7740 7741 /** 7742 * Returns true if the view is currently hovered. 7743 * 7744 * @return True if the view is currently hovered. 7745 * 7746 * @see #setHovered 7747 * @see #onHoverChanged 7748 */ 7749 @ViewDebug.ExportedProperty 7750 public boolean isHovered() { 7751 return (mPrivateFlags & HOVERED) != 0; 7752 } 7753 7754 /** 7755 * Sets whether the view is currently hovered. 7756 * <p> 7757 * Calling this method also changes the drawable state of the view. This 7758 * enables the view to react to hover by using different drawable resources 7759 * to change its appearance. 7760 * </p><p> 7761 * The {@link #onHoverChanged} method is called when the hovered state changes. 7762 * </p> 7763 * 7764 * @param hovered True if the view is hovered. 7765 * 7766 * @see #isHovered 7767 * @see #onHoverChanged 7768 */ 7769 public void setHovered(boolean hovered) { 7770 if (hovered) { 7771 if ((mPrivateFlags & HOVERED) == 0) { 7772 mPrivateFlags |= HOVERED; 7773 refreshDrawableState(); 7774 onHoverChanged(true); 7775 } 7776 } else { 7777 if ((mPrivateFlags & HOVERED) != 0) { 7778 mPrivateFlags &= ~HOVERED; 7779 refreshDrawableState(); 7780 onHoverChanged(false); 7781 } 7782 } 7783 } 7784 7785 /** 7786 * Implement this method to handle hover state changes. 7787 * <p> 7788 * This method is called whenever the hover state changes as a result of a 7789 * call to {@link #setHovered}. 7790 * </p> 7791 * 7792 * @param hovered The current hover state, as returned by {@link #isHovered}. 7793 * 7794 * @see #isHovered 7795 * @see #setHovered 7796 */ 7797 public void onHoverChanged(boolean hovered) { 7798 } 7799 7800 /** 7801 * Implement this method to handle touch screen motion events. 7802 * 7803 * @param event The motion event. 7804 * @return True if the event was handled, false otherwise. 7805 */ 7806 public boolean onTouchEvent(MotionEvent event) { 7807 final int viewFlags = mViewFlags; 7808 7809 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7810 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7811 setPressed(false); 7812 } 7813 // A disabled view that is clickable still consumes the touch 7814 // events, it just doesn't respond to them. 7815 return (((viewFlags & CLICKABLE) == CLICKABLE || 7816 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7817 } 7818 7819 if (mTouchDelegate != null) { 7820 if (mTouchDelegate.onTouchEvent(event)) { 7821 return true; 7822 } 7823 } 7824 7825 if (((viewFlags & CLICKABLE) == CLICKABLE || 7826 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7827 switch (event.getAction()) { 7828 case MotionEvent.ACTION_UP: 7829 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7830 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7831 // take focus if we don't have it already and we should in 7832 // touch mode. 7833 boolean focusTaken = false; 7834 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7835 focusTaken = requestFocus(); 7836 } 7837 7838 if (prepressed) { 7839 // The button is being released before we actually 7840 // showed it as pressed. Make it show the pressed 7841 // state now (before scheduling the click) to ensure 7842 // the user sees it. 7843 setPressed(true); 7844 } 7845 7846 if (!mHasPerformedLongPress) { 7847 // This is a tap, so remove the longpress check 7848 removeLongPressCallback(); 7849 7850 // Only perform take click actions if we were in the pressed state 7851 if (!focusTaken) { 7852 // Use a Runnable and post this rather than calling 7853 // performClick directly. This lets other visual state 7854 // of the view update before click actions start. 7855 if (mPerformClick == null) { 7856 mPerformClick = new PerformClick(); 7857 } 7858 if (!post(mPerformClick)) { 7859 performClick(); 7860 } 7861 } 7862 } 7863 7864 if (mUnsetPressedState == null) { 7865 mUnsetPressedState = new UnsetPressedState(); 7866 } 7867 7868 if (prepressed) { 7869 postDelayed(mUnsetPressedState, 7870 ViewConfiguration.getPressedStateDuration()); 7871 } else if (!post(mUnsetPressedState)) { 7872 // If the post failed, unpress right now 7873 mUnsetPressedState.run(); 7874 } 7875 removeTapCallback(); 7876 } 7877 break; 7878 7879 case MotionEvent.ACTION_DOWN: 7880 mHasPerformedLongPress = false; 7881 7882 if (performButtonActionOnTouchDown(event)) { 7883 break; 7884 } 7885 7886 // Walk up the hierarchy to determine if we're inside a scrolling container. 7887 boolean isInScrollingContainer = isInScrollingContainer(); 7888 7889 // For views inside a scrolling container, delay the pressed feedback for 7890 // a short period in case this is a scroll. 7891 if (isInScrollingContainer) { 7892 mPrivateFlags |= PREPRESSED; 7893 if (mPendingCheckForTap == null) { 7894 mPendingCheckForTap = new CheckForTap(); 7895 } 7896 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7897 } else { 7898 // Not inside a scrolling container, so show the feedback right away 7899 setPressed(true); 7900 checkForLongClick(0); 7901 } 7902 break; 7903 7904 case MotionEvent.ACTION_CANCEL: 7905 setPressed(false); 7906 removeTapCallback(); 7907 break; 7908 7909 case MotionEvent.ACTION_MOVE: 7910 final int x = (int) event.getX(); 7911 final int y = (int) event.getY(); 7912 7913 // Be lenient about moving outside of buttons 7914 if (!pointInView(x, y, mTouchSlop)) { 7915 // Outside button 7916 removeTapCallback(); 7917 if ((mPrivateFlags & PRESSED) != 0) { 7918 // Remove any future long press/tap checks 7919 removeLongPressCallback(); 7920 7921 setPressed(false); 7922 } 7923 } 7924 break; 7925 } 7926 return true; 7927 } 7928 7929 return false; 7930 } 7931 7932 /** 7933 * @hide 7934 */ 7935 public boolean isInScrollingContainer() { 7936 ViewParent p = getParent(); 7937 while (p != null && p instanceof ViewGroup) { 7938 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7939 return true; 7940 } 7941 p = p.getParent(); 7942 } 7943 return false; 7944 } 7945 7946 /** 7947 * Remove the longpress detection timer. 7948 */ 7949 private void removeLongPressCallback() { 7950 if (mPendingCheckForLongPress != null) { 7951 removeCallbacks(mPendingCheckForLongPress); 7952 } 7953 } 7954 7955 /** 7956 * Remove the pending click action 7957 */ 7958 private void removePerformClickCallback() { 7959 if (mPerformClick != null) { 7960 removeCallbacks(mPerformClick); 7961 } 7962 } 7963 7964 /** 7965 * Remove the prepress detection timer. 7966 */ 7967 private void removeUnsetPressCallback() { 7968 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7969 setPressed(false); 7970 removeCallbacks(mUnsetPressedState); 7971 } 7972 } 7973 7974 /** 7975 * Remove the tap detection timer. 7976 */ 7977 private void removeTapCallback() { 7978 if (mPendingCheckForTap != null) { 7979 mPrivateFlags &= ~PREPRESSED; 7980 removeCallbacks(mPendingCheckForTap); 7981 } 7982 } 7983 7984 /** 7985 * Cancels a pending long press. Your subclass can use this if you 7986 * want the context menu to come up if the user presses and holds 7987 * at the same place, but you don't want it to come up if they press 7988 * and then move around enough to cause scrolling. 7989 */ 7990 public void cancelLongPress() { 7991 removeLongPressCallback(); 7992 7993 /* 7994 * The prepressed state handled by the tap callback is a display 7995 * construct, but the tap callback will post a long press callback 7996 * less its own timeout. Remove it here. 7997 */ 7998 removeTapCallback(); 7999 } 8000 8001 /** 8002 * Remove the pending callback for sending a 8003 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8004 */ 8005 private void removeSendViewScrolledAccessibilityEventCallback() { 8006 if (mSendViewScrolledAccessibilityEvent != null) { 8007 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8008 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8009 } 8010 } 8011 8012 /** 8013 * Sets the TouchDelegate for this View. 8014 */ 8015 public void setTouchDelegate(TouchDelegate delegate) { 8016 mTouchDelegate = delegate; 8017 } 8018 8019 /** 8020 * Gets the TouchDelegate for this View. 8021 */ 8022 public TouchDelegate getTouchDelegate() { 8023 return mTouchDelegate; 8024 } 8025 8026 /** 8027 * Set flags controlling behavior of this view. 8028 * 8029 * @param flags Constant indicating the value which should be set 8030 * @param mask Constant indicating the bit range that should be changed 8031 */ 8032 void setFlags(int flags, int mask) { 8033 int old = mViewFlags; 8034 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8035 8036 int changed = mViewFlags ^ old; 8037 if (changed == 0) { 8038 return; 8039 } 8040 int privateFlags = mPrivateFlags; 8041 8042 /* Check if the FOCUSABLE bit has changed */ 8043 if (((changed & FOCUSABLE_MASK) != 0) && 8044 ((privateFlags & HAS_BOUNDS) !=0)) { 8045 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8046 && ((privateFlags & FOCUSED) != 0)) { 8047 /* Give up focus if we are no longer focusable */ 8048 clearFocus(); 8049 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8050 && ((privateFlags & FOCUSED) == 0)) { 8051 /* 8052 * Tell the view system that we are now available to take focus 8053 * if no one else already has it. 8054 */ 8055 if (mParent != null) mParent.focusableViewAvailable(this); 8056 } 8057 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8058 notifyAccessibilityStateChanged(); 8059 } 8060 } 8061 8062 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8063 if ((changed & VISIBILITY_MASK) != 0) { 8064 /* 8065 * If this view is becoming visible, invalidate it in case it changed while 8066 * it was not visible. Marking it drawn ensures that the invalidation will 8067 * go through. 8068 */ 8069 mPrivateFlags |= DRAWN; 8070 invalidate(true); 8071 8072 needGlobalAttributesUpdate(true); 8073 8074 // a view becoming visible is worth notifying the parent 8075 // about in case nothing has focus. even if this specific view 8076 // isn't focusable, it may contain something that is, so let 8077 // the root view try to give this focus if nothing else does. 8078 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8079 mParent.focusableViewAvailable(this); 8080 } 8081 } 8082 } 8083 8084 /* Check if the GONE bit has changed */ 8085 if ((changed & GONE) != 0) { 8086 needGlobalAttributesUpdate(false); 8087 requestLayout(); 8088 8089 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8090 if (hasFocus()) clearFocus(); 8091 clearAccessibilityFocus(); 8092 destroyDrawingCache(); 8093 if (mParent instanceof View) { 8094 // GONE views noop invalidation, so invalidate the parent 8095 ((View) mParent).invalidate(true); 8096 } 8097 // Mark the view drawn to ensure that it gets invalidated properly the next 8098 // time it is visible and gets invalidated 8099 mPrivateFlags |= DRAWN; 8100 } 8101 if (mAttachInfo != null) { 8102 mAttachInfo.mViewVisibilityChanged = true; 8103 } 8104 } 8105 8106 /* Check if the VISIBLE bit has changed */ 8107 if ((changed & INVISIBLE) != 0) { 8108 needGlobalAttributesUpdate(false); 8109 /* 8110 * If this view is becoming invisible, set the DRAWN flag so that 8111 * the next invalidate() will not be skipped. 8112 */ 8113 mPrivateFlags |= DRAWN; 8114 8115 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8116 // root view becoming invisible shouldn't clear focus and accessibility focus 8117 if (getRootView() != this) { 8118 clearFocus(); 8119 clearAccessibilityFocus(); 8120 } 8121 } 8122 if (mAttachInfo != null) { 8123 mAttachInfo.mViewVisibilityChanged = true; 8124 } 8125 } 8126 8127 if ((changed & VISIBILITY_MASK) != 0) { 8128 if (mParent instanceof ViewGroup) { 8129 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8130 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8131 ((View) mParent).invalidate(true); 8132 } else if (mParent != null) { 8133 mParent.invalidateChild(this, null); 8134 } 8135 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8136 } 8137 8138 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8139 destroyDrawingCache(); 8140 } 8141 8142 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8143 destroyDrawingCache(); 8144 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8145 invalidateParentCaches(); 8146 } 8147 8148 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8149 destroyDrawingCache(); 8150 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8151 } 8152 8153 if ((changed & DRAW_MASK) != 0) { 8154 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8155 if (mBackground != null) { 8156 mPrivateFlags &= ~SKIP_DRAW; 8157 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8158 } else { 8159 mPrivateFlags |= SKIP_DRAW; 8160 } 8161 } else { 8162 mPrivateFlags &= ~SKIP_DRAW; 8163 } 8164 requestLayout(); 8165 invalidate(true); 8166 } 8167 8168 if ((changed & KEEP_SCREEN_ON) != 0) { 8169 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8170 mParent.recomputeViewAttributes(this); 8171 } 8172 } 8173 8174 if (AccessibilityManager.getInstance(mContext).isEnabled() 8175 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8176 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8177 notifyAccessibilityStateChanged(); 8178 } 8179 } 8180 8181 /** 8182 * Change the view's z order in the tree, so it's on top of other sibling 8183 * views 8184 */ 8185 public void bringToFront() { 8186 if (mParent != null) { 8187 mParent.bringChildToFront(this); 8188 } 8189 } 8190 8191 /** 8192 * This is called in response to an internal scroll in this view (i.e., the 8193 * view scrolled its own contents). This is typically as a result of 8194 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8195 * called. 8196 * 8197 * @param l Current horizontal scroll origin. 8198 * @param t Current vertical scroll origin. 8199 * @param oldl Previous horizontal scroll origin. 8200 * @param oldt Previous vertical scroll origin. 8201 */ 8202 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8203 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8204 postSendViewScrolledAccessibilityEventCallback(); 8205 } 8206 8207 mBackgroundSizeChanged = true; 8208 8209 final AttachInfo ai = mAttachInfo; 8210 if (ai != null) { 8211 ai.mViewScrollChanged = true; 8212 } 8213 } 8214 8215 /** 8216 * Interface definition for a callback to be invoked when the layout bounds of a view 8217 * changes due to layout processing. 8218 */ 8219 public interface OnLayoutChangeListener { 8220 /** 8221 * Called when the focus state of a view has changed. 8222 * 8223 * @param v The view whose state has changed. 8224 * @param left The new value of the view's left property. 8225 * @param top The new value of the view's top property. 8226 * @param right The new value of the view's right property. 8227 * @param bottom The new value of the view's bottom property. 8228 * @param oldLeft The previous value of the view's left property. 8229 * @param oldTop The previous value of the view's top property. 8230 * @param oldRight The previous value of the view's right property. 8231 * @param oldBottom The previous value of the view's bottom property. 8232 */ 8233 void onLayoutChange(View v, int left, int top, int right, int bottom, 8234 int oldLeft, int oldTop, int oldRight, int oldBottom); 8235 } 8236 8237 /** 8238 * This is called during layout when the size of this view has changed. If 8239 * you were just added to the view hierarchy, you're called with the old 8240 * values of 0. 8241 * 8242 * @param w Current width of this view. 8243 * @param h Current height of this view. 8244 * @param oldw Old width of this view. 8245 * @param oldh Old height of this view. 8246 */ 8247 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8248 } 8249 8250 /** 8251 * Called by draw to draw the child views. This may be overridden 8252 * by derived classes to gain control just before its children are drawn 8253 * (but after its own view has been drawn). 8254 * @param canvas the canvas on which to draw the view 8255 */ 8256 protected void dispatchDraw(Canvas canvas) { 8257 8258 } 8259 8260 /** 8261 * Gets the parent of this view. Note that the parent is a 8262 * ViewParent and not necessarily a View. 8263 * 8264 * @return Parent of this view. 8265 */ 8266 public final ViewParent getParent() { 8267 return mParent; 8268 } 8269 8270 /** 8271 * Set the horizontal scrolled position of your view. This will cause a call to 8272 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8273 * invalidated. 8274 * @param value the x position to scroll to 8275 */ 8276 public void setScrollX(int value) { 8277 scrollTo(value, mScrollY); 8278 } 8279 8280 /** 8281 * Set the vertical scrolled position of your view. This will cause a call to 8282 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8283 * invalidated. 8284 * @param value the y position to scroll to 8285 */ 8286 public void setScrollY(int value) { 8287 scrollTo(mScrollX, value); 8288 } 8289 8290 /** 8291 * Return the scrolled left position of this view. This is the left edge of 8292 * the displayed part of your view. You do not need to draw any pixels 8293 * farther left, since those are outside of the frame of your view on 8294 * screen. 8295 * 8296 * @return The left edge of the displayed part of your view, in pixels. 8297 */ 8298 public final int getScrollX() { 8299 return mScrollX; 8300 } 8301 8302 /** 8303 * Return the scrolled top position of this view. This is the top edge of 8304 * the displayed part of your view. You do not need to draw any pixels above 8305 * it, since those are outside of the frame of your view on screen. 8306 * 8307 * @return The top edge of the displayed part of your view, in pixels. 8308 */ 8309 public final int getScrollY() { 8310 return mScrollY; 8311 } 8312 8313 /** 8314 * Return the width of the your view. 8315 * 8316 * @return The width of your view, in pixels. 8317 */ 8318 @ViewDebug.ExportedProperty(category = "layout") 8319 public final int getWidth() { 8320 return mRight - mLeft; 8321 } 8322 8323 /** 8324 * Return the height of your view. 8325 * 8326 * @return The height of your view, in pixels. 8327 */ 8328 @ViewDebug.ExportedProperty(category = "layout") 8329 public final int getHeight() { 8330 return mBottom - mTop; 8331 } 8332 8333 /** 8334 * Return the visible drawing bounds of your view. Fills in the output 8335 * rectangle with the values from getScrollX(), getScrollY(), 8336 * getWidth(), and getHeight(). 8337 * 8338 * @param outRect The (scrolled) drawing bounds of the view. 8339 */ 8340 public void getDrawingRect(Rect outRect) { 8341 outRect.left = mScrollX; 8342 outRect.top = mScrollY; 8343 outRect.right = mScrollX + (mRight - mLeft); 8344 outRect.bottom = mScrollY + (mBottom - mTop); 8345 } 8346 8347 /** 8348 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8349 * raw width component (that is the result is masked by 8350 * {@link #MEASURED_SIZE_MASK}). 8351 * 8352 * @return The raw measured width of this view. 8353 */ 8354 public final int getMeasuredWidth() { 8355 return mMeasuredWidth & MEASURED_SIZE_MASK; 8356 } 8357 8358 /** 8359 * Return the full width measurement information for this view as computed 8360 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8361 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8362 * This should be used during measurement and layout calculations only. Use 8363 * {@link #getWidth()} to see how wide a view is after layout. 8364 * 8365 * @return The measured width of this view as a bit mask. 8366 */ 8367 public final int getMeasuredWidthAndState() { 8368 return mMeasuredWidth; 8369 } 8370 8371 /** 8372 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8373 * raw width component (that is the result is masked by 8374 * {@link #MEASURED_SIZE_MASK}). 8375 * 8376 * @return The raw measured height of this view. 8377 */ 8378 public final int getMeasuredHeight() { 8379 return mMeasuredHeight & MEASURED_SIZE_MASK; 8380 } 8381 8382 /** 8383 * Return the full height measurement information for this view as computed 8384 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8385 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8386 * This should be used during measurement and layout calculations only. Use 8387 * {@link #getHeight()} to see how wide a view is after layout. 8388 * 8389 * @return The measured width of this view as a bit mask. 8390 */ 8391 public final int getMeasuredHeightAndState() { 8392 return mMeasuredHeight; 8393 } 8394 8395 /** 8396 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8397 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8398 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8399 * and the height component is at the shifted bits 8400 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8401 */ 8402 public final int getMeasuredState() { 8403 return (mMeasuredWidth&MEASURED_STATE_MASK) 8404 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8405 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8406 } 8407 8408 /** 8409 * The transform matrix of this view, which is calculated based on the current 8410 * roation, scale, and pivot properties. 8411 * 8412 * @see #getRotation() 8413 * @see #getScaleX() 8414 * @see #getScaleY() 8415 * @see #getPivotX() 8416 * @see #getPivotY() 8417 * @return The current transform matrix for the view 8418 */ 8419 public Matrix getMatrix() { 8420 if (mTransformationInfo != null) { 8421 updateMatrix(); 8422 return mTransformationInfo.mMatrix; 8423 } 8424 return Matrix.IDENTITY_MATRIX; 8425 } 8426 8427 /** 8428 * Utility function to determine if the value is far enough away from zero to be 8429 * considered non-zero. 8430 * @param value A floating point value to check for zero-ness 8431 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8432 */ 8433 private static boolean nonzero(float value) { 8434 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8435 } 8436 8437 /** 8438 * Returns true if the transform matrix is the identity matrix. 8439 * Recomputes the matrix if necessary. 8440 * 8441 * @return True if the transform matrix is the identity matrix, false otherwise. 8442 */ 8443 final boolean hasIdentityMatrix() { 8444 if (mTransformationInfo != null) { 8445 updateMatrix(); 8446 return mTransformationInfo.mMatrixIsIdentity; 8447 } 8448 return true; 8449 } 8450 8451 void ensureTransformationInfo() { 8452 if (mTransformationInfo == null) { 8453 mTransformationInfo = new TransformationInfo(); 8454 } 8455 } 8456 8457 /** 8458 * Recomputes the transform matrix if necessary. 8459 */ 8460 private void updateMatrix() { 8461 final TransformationInfo info = mTransformationInfo; 8462 if (info == null) { 8463 return; 8464 } 8465 if (info.mMatrixDirty) { 8466 // transform-related properties have changed since the last time someone 8467 // asked for the matrix; recalculate it with the current values 8468 8469 // Figure out if we need to update the pivot point 8470 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8471 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8472 info.mPrevWidth = mRight - mLeft; 8473 info.mPrevHeight = mBottom - mTop; 8474 info.mPivotX = info.mPrevWidth / 2f; 8475 info.mPivotY = info.mPrevHeight / 2f; 8476 } 8477 } 8478 info.mMatrix.reset(); 8479 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8480 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8481 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8482 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8483 } else { 8484 if (info.mCamera == null) { 8485 info.mCamera = new Camera(); 8486 info.matrix3D = new Matrix(); 8487 } 8488 info.mCamera.save(); 8489 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8490 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8491 info.mCamera.getMatrix(info.matrix3D); 8492 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8493 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8494 info.mPivotY + info.mTranslationY); 8495 info.mMatrix.postConcat(info.matrix3D); 8496 info.mCamera.restore(); 8497 } 8498 info.mMatrixDirty = false; 8499 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8500 info.mInverseMatrixDirty = true; 8501 } 8502 } 8503 8504 /** 8505 * When searching for a view to focus this rectangle is used when considering if this view is 8506 * a good candidate for receiving focus. 8507 * 8508 * By default, the rectangle is the {@link #getDrawingRect}) of the view. 8509 * 8510 * @param r The rectangle to fill in, in this view's coordinates. 8511 */ 8512 public void getFocusRect(Rect r) { 8513 getDrawingRect(r); 8514 } 8515 8516 /** 8517 * Utility method to retrieve the inverse of the current mMatrix property. 8518 * We cache the matrix to avoid recalculating it when transform properties 8519 * have not changed. 8520 * 8521 * @return The inverse of the current matrix of this view. 8522 */ 8523 final Matrix getInverseMatrix() { 8524 final TransformationInfo info = mTransformationInfo; 8525 if (info != null) { 8526 updateMatrix(); 8527 if (info.mInverseMatrixDirty) { 8528 if (info.mInverseMatrix == null) { 8529 info.mInverseMatrix = new Matrix(); 8530 } 8531 info.mMatrix.invert(info.mInverseMatrix); 8532 info.mInverseMatrixDirty = false; 8533 } 8534 return info.mInverseMatrix; 8535 } 8536 return Matrix.IDENTITY_MATRIX; 8537 } 8538 8539 /** 8540 * Gets the distance along the Z axis from the camera to this view. 8541 * 8542 * @see #setCameraDistance(float) 8543 * 8544 * @return The distance along the Z axis. 8545 */ 8546 public float getCameraDistance() { 8547 ensureTransformationInfo(); 8548 final float dpi = mResources.getDisplayMetrics().densityDpi; 8549 final TransformationInfo info = mTransformationInfo; 8550 if (info.mCamera == null) { 8551 info.mCamera = new Camera(); 8552 info.matrix3D = new Matrix(); 8553 } 8554 return -(info.mCamera.getLocationZ() * dpi); 8555 } 8556 8557 /** 8558 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8559 * views are drawn) from the camera to this view. The camera's distance 8560 * affects 3D transformations, for instance rotations around the X and Y 8561 * axis. If the rotationX or rotationY properties are changed and this view is 8562 * large (more than half the size of the screen), it is recommended to always 8563 * use a camera distance that's greater than the height (X axis rotation) or 8564 * the width (Y axis rotation) of this view.</p> 8565 * 8566 * <p>The distance of the camera from the view plane can have an affect on the 8567 * perspective distortion of the view when it is rotated around the x or y axis. 8568 * For example, a large distance will result in a large viewing angle, and there 8569 * will not be much perspective distortion of the view as it rotates. A short 8570 * distance may cause much more perspective distortion upon rotation, and can 8571 * also result in some drawing artifacts if the rotated view ends up partially 8572 * behind the camera (which is why the recommendation is to use a distance at 8573 * least as far as the size of the view, if the view is to be rotated.)</p> 8574 * 8575 * <p>The distance is expressed in "depth pixels." The default distance depends 8576 * on the screen density. For instance, on a medium density display, the 8577 * default distance is 1280. On a high density display, the default distance 8578 * is 1920.</p> 8579 * 8580 * <p>If you want to specify a distance that leads to visually consistent 8581 * results across various densities, use the following formula:</p> 8582 * <pre> 8583 * float scale = context.getResources().getDisplayMetrics().density; 8584 * view.setCameraDistance(distance * scale); 8585 * </pre> 8586 * 8587 * <p>The density scale factor of a high density display is 1.5, 8588 * and 1920 = 1280 * 1.5.</p> 8589 * 8590 * @param distance The distance in "depth pixels", if negative the opposite 8591 * value is used 8592 * 8593 * @see #setRotationX(float) 8594 * @see #setRotationY(float) 8595 */ 8596 public void setCameraDistance(float distance) { 8597 invalidateViewProperty(true, false); 8598 8599 ensureTransformationInfo(); 8600 final float dpi = mResources.getDisplayMetrics().densityDpi; 8601 final TransformationInfo info = mTransformationInfo; 8602 if (info.mCamera == null) { 8603 info.mCamera = new Camera(); 8604 info.matrix3D = new Matrix(); 8605 } 8606 8607 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8608 info.mMatrixDirty = true; 8609 8610 invalidateViewProperty(false, false); 8611 if (mDisplayList != null) { 8612 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8613 } 8614 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8615 // View was rejected last time it was drawn by its parent; this may have changed 8616 invalidateParentIfNeeded(); 8617 } 8618 } 8619 8620 /** 8621 * The degrees that the view is rotated around the pivot point. 8622 * 8623 * @see #setRotation(float) 8624 * @see #getPivotX() 8625 * @see #getPivotY() 8626 * 8627 * @return The degrees of rotation. 8628 */ 8629 @ViewDebug.ExportedProperty(category = "drawing") 8630 public float getRotation() { 8631 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8632 } 8633 8634 /** 8635 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8636 * result in clockwise rotation. 8637 * 8638 * @param rotation The degrees of rotation. 8639 * 8640 * @see #getRotation() 8641 * @see #getPivotX() 8642 * @see #getPivotY() 8643 * @see #setRotationX(float) 8644 * @see #setRotationY(float) 8645 * 8646 * @attr ref android.R.styleable#View_rotation 8647 */ 8648 public void setRotation(float rotation) { 8649 ensureTransformationInfo(); 8650 final TransformationInfo info = mTransformationInfo; 8651 if (info.mRotation != rotation) { 8652 // Double-invalidation is necessary to capture view's old and new areas 8653 invalidateViewProperty(true, false); 8654 info.mRotation = rotation; 8655 info.mMatrixDirty = true; 8656 invalidateViewProperty(false, true); 8657 if (mDisplayList != null) { 8658 mDisplayList.setRotation(rotation); 8659 } 8660 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8661 // View was rejected last time it was drawn by its parent; this may have changed 8662 invalidateParentIfNeeded(); 8663 } 8664 } 8665 } 8666 8667 /** 8668 * The degrees that the view is rotated around the vertical axis through the pivot point. 8669 * 8670 * @see #getPivotX() 8671 * @see #getPivotY() 8672 * @see #setRotationY(float) 8673 * 8674 * @return The degrees of Y rotation. 8675 */ 8676 @ViewDebug.ExportedProperty(category = "drawing") 8677 public float getRotationY() { 8678 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8679 } 8680 8681 /** 8682 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8683 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8684 * down the y axis. 8685 * 8686 * When rotating large views, it is recommended to adjust the camera distance 8687 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8688 * 8689 * @param rotationY The degrees of Y rotation. 8690 * 8691 * @see #getRotationY() 8692 * @see #getPivotX() 8693 * @see #getPivotY() 8694 * @see #setRotation(float) 8695 * @see #setRotationX(float) 8696 * @see #setCameraDistance(float) 8697 * 8698 * @attr ref android.R.styleable#View_rotationY 8699 */ 8700 public void setRotationY(float rotationY) { 8701 ensureTransformationInfo(); 8702 final TransformationInfo info = mTransformationInfo; 8703 if (info.mRotationY != rotationY) { 8704 invalidateViewProperty(true, false); 8705 info.mRotationY = rotationY; 8706 info.mMatrixDirty = true; 8707 invalidateViewProperty(false, true); 8708 if (mDisplayList != null) { 8709 mDisplayList.setRotationY(rotationY); 8710 } 8711 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8712 // View was rejected last time it was drawn by its parent; this may have changed 8713 invalidateParentIfNeeded(); 8714 } 8715 } 8716 } 8717 8718 /** 8719 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8720 * 8721 * @see #getPivotX() 8722 * @see #getPivotY() 8723 * @see #setRotationX(float) 8724 * 8725 * @return The degrees of X rotation. 8726 */ 8727 @ViewDebug.ExportedProperty(category = "drawing") 8728 public float getRotationX() { 8729 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8730 } 8731 8732 /** 8733 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8734 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8735 * x axis. 8736 * 8737 * When rotating large views, it is recommended to adjust the camera distance 8738 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8739 * 8740 * @param rotationX The degrees of X rotation. 8741 * 8742 * @see #getRotationX() 8743 * @see #getPivotX() 8744 * @see #getPivotY() 8745 * @see #setRotation(float) 8746 * @see #setRotationY(float) 8747 * @see #setCameraDistance(float) 8748 * 8749 * @attr ref android.R.styleable#View_rotationX 8750 */ 8751 public void setRotationX(float rotationX) { 8752 ensureTransformationInfo(); 8753 final TransformationInfo info = mTransformationInfo; 8754 if (info.mRotationX != rotationX) { 8755 invalidateViewProperty(true, false); 8756 info.mRotationX = rotationX; 8757 info.mMatrixDirty = true; 8758 invalidateViewProperty(false, true); 8759 if (mDisplayList != null) { 8760 mDisplayList.setRotationX(rotationX); 8761 } 8762 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8763 // View was rejected last time it was drawn by its parent; this may have changed 8764 invalidateParentIfNeeded(); 8765 } 8766 } 8767 } 8768 8769 /** 8770 * The amount that the view is scaled in x around the pivot point, as a proportion of 8771 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8772 * 8773 * <p>By default, this is 1.0f. 8774 * 8775 * @see #getPivotX() 8776 * @see #getPivotY() 8777 * @return The scaling factor. 8778 */ 8779 @ViewDebug.ExportedProperty(category = "drawing") 8780 public float getScaleX() { 8781 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8782 } 8783 8784 /** 8785 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8786 * the view's unscaled width. A value of 1 means that no scaling is applied. 8787 * 8788 * @param scaleX The scaling factor. 8789 * @see #getPivotX() 8790 * @see #getPivotY() 8791 * 8792 * @attr ref android.R.styleable#View_scaleX 8793 */ 8794 public void setScaleX(float scaleX) { 8795 ensureTransformationInfo(); 8796 final TransformationInfo info = mTransformationInfo; 8797 if (info.mScaleX != scaleX) { 8798 invalidateViewProperty(true, false); 8799 info.mScaleX = scaleX; 8800 info.mMatrixDirty = true; 8801 invalidateViewProperty(false, true); 8802 if (mDisplayList != null) { 8803 mDisplayList.setScaleX(scaleX); 8804 } 8805 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8806 // View was rejected last time it was drawn by its parent; this may have changed 8807 invalidateParentIfNeeded(); 8808 } 8809 } 8810 } 8811 8812 /** 8813 * The amount that the view is scaled in y around the pivot point, as a proportion of 8814 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8815 * 8816 * <p>By default, this is 1.0f. 8817 * 8818 * @see #getPivotX() 8819 * @see #getPivotY() 8820 * @return The scaling factor. 8821 */ 8822 @ViewDebug.ExportedProperty(category = "drawing") 8823 public float getScaleY() { 8824 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8825 } 8826 8827 /** 8828 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8829 * the view's unscaled width. A value of 1 means that no scaling is applied. 8830 * 8831 * @param scaleY The scaling factor. 8832 * @see #getPivotX() 8833 * @see #getPivotY() 8834 * 8835 * @attr ref android.R.styleable#View_scaleY 8836 */ 8837 public void setScaleY(float scaleY) { 8838 ensureTransformationInfo(); 8839 final TransformationInfo info = mTransformationInfo; 8840 if (info.mScaleY != scaleY) { 8841 invalidateViewProperty(true, false); 8842 info.mScaleY = scaleY; 8843 info.mMatrixDirty = true; 8844 invalidateViewProperty(false, true); 8845 if (mDisplayList != null) { 8846 mDisplayList.setScaleY(scaleY); 8847 } 8848 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8849 // View was rejected last time it was drawn by its parent; this may have changed 8850 invalidateParentIfNeeded(); 8851 } 8852 } 8853 } 8854 8855 /** 8856 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8857 * and {@link #setScaleX(float) scaled}. 8858 * 8859 * @see #getRotation() 8860 * @see #getScaleX() 8861 * @see #getScaleY() 8862 * @see #getPivotY() 8863 * @return The x location of the pivot point. 8864 * 8865 * @attr ref android.R.styleable#View_transformPivotX 8866 */ 8867 @ViewDebug.ExportedProperty(category = "drawing") 8868 public float getPivotX() { 8869 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8870 } 8871 8872 /** 8873 * Sets the x location of the point around which the view is 8874 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8875 * 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 pivotX The x 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_transformPivotX 8886 */ 8887 public void setPivotX(float pivotX) { 8888 ensureTransformationInfo(); 8889 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8890 final TransformationInfo info = mTransformationInfo; 8891 if (info.mPivotX != pivotX) { 8892 invalidateViewProperty(true, false); 8893 info.mPivotX = pivotX; 8894 info.mMatrixDirty = true; 8895 invalidateViewProperty(false, true); 8896 if (mDisplayList != null) { 8897 mDisplayList.setPivotX(pivotX); 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 y location of the point around which the view is {@link #setRotation(float) rotated} 8908 * and {@link #setScaleY(float) scaled}. 8909 * 8910 * @see #getRotation() 8911 * @see #getScaleX() 8912 * @see #getScaleY() 8913 * @see #getPivotY() 8914 * @return The y location of the pivot point. 8915 * 8916 * @attr ref android.R.styleable#View_transformPivotY 8917 */ 8918 @ViewDebug.ExportedProperty(category = "drawing") 8919 public float getPivotY() { 8920 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8921 } 8922 8923 /** 8924 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8925 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8926 * Setting this property disables this behavior and causes the view to use only the 8927 * explicitly set pivotX and pivotY values. 8928 * 8929 * @param pivotY The y location of the pivot point. 8930 * @see #getRotation() 8931 * @see #getScaleX() 8932 * @see #getScaleY() 8933 * @see #getPivotY() 8934 * 8935 * @attr ref android.R.styleable#View_transformPivotY 8936 */ 8937 public void setPivotY(float pivotY) { 8938 ensureTransformationInfo(); 8939 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8940 final TransformationInfo info = mTransformationInfo; 8941 if (info.mPivotY != pivotY) { 8942 invalidateViewProperty(true, false); 8943 info.mPivotY = pivotY; 8944 info.mMatrixDirty = true; 8945 invalidateViewProperty(false, true); 8946 if (mDisplayList != null) { 8947 mDisplayList.setPivotY(pivotY); 8948 } 8949 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8950 // View was rejected last time it was drawn by its parent; this may have changed 8951 invalidateParentIfNeeded(); 8952 } 8953 } 8954 } 8955 8956 /** 8957 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8958 * completely transparent and 1 means the view is completely opaque. 8959 * 8960 * <p>By default this is 1.0f. 8961 * @return The opacity of the view. 8962 */ 8963 @ViewDebug.ExportedProperty(category = "drawing") 8964 public float getAlpha() { 8965 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8966 } 8967 8968 /** 8969 * Returns whether this View has content which overlaps. This function, intended to be 8970 * overridden by specific View types, is an optimization when alpha is set on a view. If 8971 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8972 * and then composited it into place, which can be expensive. If the view has no overlapping 8973 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8974 * An example of overlapping rendering is a TextView with a background image, such as a 8975 * Button. An example of non-overlapping rendering is a TextView with no background, or 8976 * an ImageView with only the foreground image. The default implementation returns true; 8977 * subclasses should override if they have cases which can be optimized. 8978 * 8979 * @return true if the content in this view might overlap, false otherwise. 8980 */ 8981 public boolean hasOverlappingRendering() { 8982 return true; 8983 } 8984 8985 /** 8986 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8987 * completely transparent and 1 means the view is completely opaque.</p> 8988 * 8989 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8990 * responsible for applying the opacity itself. Otherwise, calling this method is 8991 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8992 * setting a hardware layer.</p> 8993 * 8994 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8995 * performance implications. It is generally best to use the alpha property sparingly and 8996 * transiently, as in the case of fading animations.</p> 8997 * 8998 * @param alpha The opacity of the view. 8999 * 9000 * @see #setLayerType(int, android.graphics.Paint) 9001 * 9002 * @attr ref android.R.styleable#View_alpha 9003 */ 9004 public void setAlpha(float alpha) { 9005 ensureTransformationInfo(); 9006 if (mTransformationInfo.mAlpha != alpha) { 9007 mTransformationInfo.mAlpha = alpha; 9008 if (onSetAlpha((int) (alpha * 255))) { 9009 mPrivateFlags |= ALPHA_SET; 9010 // subclass is handling alpha - don't optimize rendering cache invalidation 9011 invalidateParentCaches(); 9012 invalidate(true); 9013 } else { 9014 mPrivateFlags &= ~ALPHA_SET; 9015 invalidateViewProperty(true, false); 9016 if (mDisplayList != null) { 9017 mDisplayList.setAlpha(alpha); 9018 } 9019 } 9020 } 9021 } 9022 9023 /** 9024 * Faster version of setAlpha() which performs the same steps except there are 9025 * no calls to invalidate(). The caller of this function should perform proper invalidation 9026 * on the parent and this object. The return value indicates whether the subclass handles 9027 * alpha (the return value for onSetAlpha()). 9028 * 9029 * @param alpha The new value for the alpha property 9030 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9031 * the new value for the alpha property is different from the old value 9032 */ 9033 boolean setAlphaNoInvalidation(float alpha) { 9034 ensureTransformationInfo(); 9035 if (mTransformationInfo.mAlpha != alpha) { 9036 mTransformationInfo.mAlpha = alpha; 9037 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9038 if (subclassHandlesAlpha) { 9039 mPrivateFlags |= ALPHA_SET; 9040 return true; 9041 } else { 9042 mPrivateFlags &= ~ALPHA_SET; 9043 if (mDisplayList != null) { 9044 mDisplayList.setAlpha(alpha); 9045 } 9046 } 9047 } 9048 return false; 9049 } 9050 9051 /** 9052 * Top position of this view relative to its parent. 9053 * 9054 * @return The top of this view, in pixels. 9055 */ 9056 @ViewDebug.CapturedViewProperty 9057 public final int getTop() { 9058 return mTop; 9059 } 9060 9061 /** 9062 * Sets the top position of this view relative to its parent. This method is meant to be called 9063 * by the layout system and should not generally be called otherwise, because the property 9064 * may be changed at any time by the layout. 9065 * 9066 * @param top The top of this view, in pixels. 9067 */ 9068 public final void setTop(int top) { 9069 if (top != mTop) { 9070 updateMatrix(); 9071 final boolean matrixIsIdentity = mTransformationInfo == null 9072 || mTransformationInfo.mMatrixIsIdentity; 9073 if (matrixIsIdentity) { 9074 if (mAttachInfo != null) { 9075 int minTop; 9076 int yLoc; 9077 if (top < mTop) { 9078 minTop = top; 9079 yLoc = top - mTop; 9080 } else { 9081 minTop = mTop; 9082 yLoc = 0; 9083 } 9084 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9085 } 9086 } else { 9087 // Double-invalidation is necessary to capture view's old and new areas 9088 invalidate(true); 9089 } 9090 9091 int width = mRight - mLeft; 9092 int oldHeight = mBottom - mTop; 9093 9094 mTop = top; 9095 if (mDisplayList != null) { 9096 mDisplayList.setTop(mTop); 9097 } 9098 9099 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9100 9101 if (!matrixIsIdentity) { 9102 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9103 // A change in dimension means an auto-centered pivot point changes, too 9104 mTransformationInfo.mMatrixDirty = true; 9105 } 9106 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9107 invalidate(true); 9108 } 9109 mBackgroundSizeChanged = true; 9110 invalidateParentIfNeeded(); 9111 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9112 // View was rejected last time it was drawn by its parent; this may have changed 9113 invalidateParentIfNeeded(); 9114 } 9115 } 9116 } 9117 9118 /** 9119 * Bottom position of this view relative to its parent. 9120 * 9121 * @return The bottom of this view, in pixels. 9122 */ 9123 @ViewDebug.CapturedViewProperty 9124 public final int getBottom() { 9125 return mBottom; 9126 } 9127 9128 /** 9129 * True if this view has changed since the last time being drawn. 9130 * 9131 * @return The dirty state of this view. 9132 */ 9133 public boolean isDirty() { 9134 return (mPrivateFlags & DIRTY_MASK) != 0; 9135 } 9136 9137 /** 9138 * Sets the bottom position of this view relative to its parent. This method is meant to be 9139 * called by the layout system and should not generally be called otherwise, because the 9140 * property may be changed at any time by the layout. 9141 * 9142 * @param bottom The bottom of this view, in pixels. 9143 */ 9144 public final void setBottom(int bottom) { 9145 if (bottom != mBottom) { 9146 updateMatrix(); 9147 final boolean matrixIsIdentity = mTransformationInfo == null 9148 || mTransformationInfo.mMatrixIsIdentity; 9149 if (matrixIsIdentity) { 9150 if (mAttachInfo != null) { 9151 int maxBottom; 9152 if (bottom < mBottom) { 9153 maxBottom = mBottom; 9154 } else { 9155 maxBottom = bottom; 9156 } 9157 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9158 } 9159 } else { 9160 // Double-invalidation is necessary to capture view's old and new areas 9161 invalidate(true); 9162 } 9163 9164 int width = mRight - mLeft; 9165 int oldHeight = mBottom - mTop; 9166 9167 mBottom = bottom; 9168 if (mDisplayList != null) { 9169 mDisplayList.setBottom(mBottom); 9170 } 9171 9172 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9173 9174 if (!matrixIsIdentity) { 9175 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9176 // A change in dimension means an auto-centered pivot point changes, too 9177 mTransformationInfo.mMatrixDirty = true; 9178 } 9179 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9180 invalidate(true); 9181 } 9182 mBackgroundSizeChanged = true; 9183 invalidateParentIfNeeded(); 9184 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9185 // View was rejected last time it was drawn by its parent; this may have changed 9186 invalidateParentIfNeeded(); 9187 } 9188 } 9189 } 9190 9191 /** 9192 * Left position of this view relative to its parent. 9193 * 9194 * @return The left edge of this view, in pixels. 9195 */ 9196 @ViewDebug.CapturedViewProperty 9197 public final int getLeft() { 9198 return mLeft; 9199 } 9200 9201 /** 9202 * Sets the left position of this view relative to its parent. This method is meant to be called 9203 * by the layout system and should not generally be called otherwise, because the property 9204 * may be changed at any time by the layout. 9205 * 9206 * @param left The bottom of this view, in pixels. 9207 */ 9208 public final void setLeft(int left) { 9209 if (left != mLeft) { 9210 updateMatrix(); 9211 final boolean matrixIsIdentity = mTransformationInfo == null 9212 || mTransformationInfo.mMatrixIsIdentity; 9213 if (matrixIsIdentity) { 9214 if (mAttachInfo != null) { 9215 int minLeft; 9216 int xLoc; 9217 if (left < mLeft) { 9218 minLeft = left; 9219 xLoc = left - mLeft; 9220 } else { 9221 minLeft = mLeft; 9222 xLoc = 0; 9223 } 9224 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9225 } 9226 } else { 9227 // Double-invalidation is necessary to capture view's old and new areas 9228 invalidate(true); 9229 } 9230 9231 int oldWidth = mRight - mLeft; 9232 int height = mBottom - mTop; 9233 9234 mLeft = left; 9235 if (mDisplayList != null) { 9236 mDisplayList.setLeft(left); 9237 } 9238 9239 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9240 9241 if (!matrixIsIdentity) { 9242 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9243 // A change in dimension means an auto-centered pivot point changes, too 9244 mTransformationInfo.mMatrixDirty = true; 9245 } 9246 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9247 invalidate(true); 9248 } 9249 mBackgroundSizeChanged = true; 9250 invalidateParentIfNeeded(); 9251 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9252 // View was rejected last time it was drawn by its parent; this may have changed 9253 invalidateParentIfNeeded(); 9254 } 9255 } 9256 } 9257 9258 /** 9259 * Right position of this view relative to its parent. 9260 * 9261 * @return The right edge of this view, in pixels. 9262 */ 9263 @ViewDebug.CapturedViewProperty 9264 public final int getRight() { 9265 return mRight; 9266 } 9267 9268 /** 9269 * Sets the right position of this view relative to its parent. This method is meant to be called 9270 * by the layout system and should not generally be called otherwise, because the property 9271 * may be changed at any time by the layout. 9272 * 9273 * @param right The bottom of this view, in pixels. 9274 */ 9275 public final void setRight(int right) { 9276 if (right != mRight) { 9277 updateMatrix(); 9278 final boolean matrixIsIdentity = mTransformationInfo == null 9279 || mTransformationInfo.mMatrixIsIdentity; 9280 if (matrixIsIdentity) { 9281 if (mAttachInfo != null) { 9282 int maxRight; 9283 if (right < mRight) { 9284 maxRight = mRight; 9285 } else { 9286 maxRight = right; 9287 } 9288 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9289 } 9290 } else { 9291 // Double-invalidation is necessary to capture view's old and new areas 9292 invalidate(true); 9293 } 9294 9295 int oldWidth = mRight - mLeft; 9296 int height = mBottom - mTop; 9297 9298 mRight = right; 9299 if (mDisplayList != null) { 9300 mDisplayList.setRight(mRight); 9301 } 9302 9303 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9304 9305 if (!matrixIsIdentity) { 9306 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9307 // A change in dimension means an auto-centered pivot point changes, too 9308 mTransformationInfo.mMatrixDirty = true; 9309 } 9310 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9311 invalidate(true); 9312 } 9313 mBackgroundSizeChanged = true; 9314 invalidateParentIfNeeded(); 9315 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9316 // View was rejected last time it was drawn by its parent; this may have changed 9317 invalidateParentIfNeeded(); 9318 } 9319 } 9320 } 9321 9322 /** 9323 * The visual x position of this view, in pixels. This is equivalent to the 9324 * {@link #setTranslationX(float) translationX} property plus the current 9325 * {@link #getLeft() left} property. 9326 * 9327 * @return The visual x position of this view, in pixels. 9328 */ 9329 @ViewDebug.ExportedProperty(category = "drawing") 9330 public float getX() { 9331 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9332 } 9333 9334 /** 9335 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9336 * {@link #setTranslationX(float) translationX} property to be the difference between 9337 * the x value passed in and the current {@link #getLeft() left} property. 9338 * 9339 * @param x The visual x position of this view, in pixels. 9340 */ 9341 public void setX(float x) { 9342 setTranslationX(x - mLeft); 9343 } 9344 9345 /** 9346 * The visual y position of this view, in pixels. This is equivalent to the 9347 * {@link #setTranslationY(float) translationY} property plus the current 9348 * {@link #getTop() top} property. 9349 * 9350 * @return The visual y position of this view, in pixels. 9351 */ 9352 @ViewDebug.ExportedProperty(category = "drawing") 9353 public float getY() { 9354 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9355 } 9356 9357 /** 9358 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9359 * {@link #setTranslationY(float) translationY} property to be the difference between 9360 * the y value passed in and the current {@link #getTop() top} property. 9361 * 9362 * @param y The visual y position of this view, in pixels. 9363 */ 9364 public void setY(float y) { 9365 setTranslationY(y - mTop); 9366 } 9367 9368 9369 /** 9370 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9371 * This position is post-layout, in addition to wherever the object's 9372 * layout placed it. 9373 * 9374 * @return The horizontal position of this view relative to its left position, in pixels. 9375 */ 9376 @ViewDebug.ExportedProperty(category = "drawing") 9377 public float getTranslationX() { 9378 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9379 } 9380 9381 /** 9382 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9383 * This effectively positions the object post-layout, in addition to wherever the object's 9384 * layout placed it. 9385 * 9386 * @param translationX The horizontal position of this view relative to its left position, 9387 * in pixels. 9388 * 9389 * @attr ref android.R.styleable#View_translationX 9390 */ 9391 public void setTranslationX(float translationX) { 9392 ensureTransformationInfo(); 9393 final TransformationInfo info = mTransformationInfo; 9394 if (info.mTranslationX != translationX) { 9395 // Double-invalidation is necessary to capture view's old and new areas 9396 invalidateViewProperty(true, false); 9397 info.mTranslationX = translationX; 9398 info.mMatrixDirty = true; 9399 invalidateViewProperty(false, true); 9400 if (mDisplayList != null) { 9401 mDisplayList.setTranslationX(translationX); 9402 } 9403 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9404 // View was rejected last time it was drawn by its parent; this may have changed 9405 invalidateParentIfNeeded(); 9406 } 9407 } 9408 } 9409 9410 /** 9411 * The horizontal location of this view relative to its {@link #getTop() top} position. 9412 * This position is post-layout, in addition to wherever the object's 9413 * layout placed it. 9414 * 9415 * @return The vertical position of this view relative to its top position, 9416 * in pixels. 9417 */ 9418 @ViewDebug.ExportedProperty(category = "drawing") 9419 public float getTranslationY() { 9420 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9421 } 9422 9423 /** 9424 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9425 * This effectively positions the object post-layout, in addition to wherever the object's 9426 * layout placed it. 9427 * 9428 * @param translationY The vertical position of this view relative to its top position, 9429 * in pixels. 9430 * 9431 * @attr ref android.R.styleable#View_translationY 9432 */ 9433 public void setTranslationY(float translationY) { 9434 ensureTransformationInfo(); 9435 final TransformationInfo info = mTransformationInfo; 9436 if (info.mTranslationY != translationY) { 9437 invalidateViewProperty(true, false); 9438 info.mTranslationY = translationY; 9439 info.mMatrixDirty = true; 9440 invalidateViewProperty(false, true); 9441 if (mDisplayList != null) { 9442 mDisplayList.setTranslationY(translationY); 9443 } 9444 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9445 // View was rejected last time it was drawn by its parent; this may have changed 9446 invalidateParentIfNeeded(); 9447 } 9448 } 9449 } 9450 9451 /** 9452 * Hit rectangle in parent's coordinates 9453 * 9454 * @param outRect The hit rectangle of the view. 9455 */ 9456 public void getHitRect(Rect outRect) { 9457 updateMatrix(); 9458 final TransformationInfo info = mTransformationInfo; 9459 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9460 outRect.set(mLeft, mTop, mRight, mBottom); 9461 } else { 9462 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9463 tmpRect.set(-info.mPivotX, -info.mPivotY, 9464 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9465 info.mMatrix.mapRect(tmpRect); 9466 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9467 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9468 } 9469 } 9470 9471 /** 9472 * Determines whether the given point, in local coordinates is inside the view. 9473 */ 9474 /*package*/ final boolean pointInView(float localX, float localY) { 9475 return localX >= 0 && localX < (mRight - mLeft) 9476 && localY >= 0 && localY < (mBottom - mTop); 9477 } 9478 9479 /** 9480 * Utility method to determine whether the given point, in local coordinates, 9481 * is inside the view, where the area of the view is expanded by the slop factor. 9482 * This method is called while processing touch-move events to determine if the event 9483 * is still within the view. 9484 */ 9485 private boolean pointInView(float localX, float localY, float slop) { 9486 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9487 localY < ((mBottom - mTop) + slop); 9488 } 9489 9490 /** 9491 * When a view has focus and the user navigates away from it, the next view is searched for 9492 * starting from the rectangle filled in by this method. 9493 * 9494 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9495 * of the view. However, if your view maintains some idea of internal selection, 9496 * such as a cursor, or a selected row or column, you should override this method and 9497 * fill in a more specific rectangle. 9498 * 9499 * @param r The rectangle to fill in, in this view's coordinates. 9500 */ 9501 public void getFocusedRect(Rect r) { 9502 getDrawingRect(r); 9503 } 9504 9505 /** 9506 * If some part of this view is not clipped by any of its parents, then 9507 * return that area in r in global (root) coordinates. To convert r to local 9508 * coordinates (without taking possible View rotations into account), offset 9509 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9510 * If the view is completely clipped or translated out, return false. 9511 * 9512 * @param r If true is returned, r holds the global coordinates of the 9513 * visible portion of this view. 9514 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9515 * between this view and its root. globalOffet may be null. 9516 * @return true if r is non-empty (i.e. part of the view is visible at the 9517 * root level. 9518 */ 9519 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9520 int width = mRight - mLeft; 9521 int height = mBottom - mTop; 9522 if (width > 0 && height > 0) { 9523 r.set(0, 0, width, height); 9524 if (globalOffset != null) { 9525 globalOffset.set(-mScrollX, -mScrollY); 9526 } 9527 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9528 } 9529 return false; 9530 } 9531 9532 public final boolean getGlobalVisibleRect(Rect r) { 9533 return getGlobalVisibleRect(r, null); 9534 } 9535 9536 public final boolean getLocalVisibleRect(Rect r) { 9537 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9538 if (getGlobalVisibleRect(r, offset)) { 9539 r.offset(-offset.x, -offset.y); // make r local 9540 return true; 9541 } 9542 return false; 9543 } 9544 9545 /** 9546 * Offset this view's vertical location by the specified number of pixels. 9547 * 9548 * @param offset the number of pixels to offset the view by 9549 */ 9550 public void offsetTopAndBottom(int offset) { 9551 if (offset != 0) { 9552 updateMatrix(); 9553 final boolean matrixIsIdentity = mTransformationInfo == null 9554 || mTransformationInfo.mMatrixIsIdentity; 9555 if (matrixIsIdentity) { 9556 if (mDisplayList != null) { 9557 invalidateViewProperty(false, false); 9558 } else { 9559 final ViewParent p = mParent; 9560 if (p != null && mAttachInfo != null) { 9561 final Rect r = mAttachInfo.mTmpInvalRect; 9562 int minTop; 9563 int maxBottom; 9564 int yLoc; 9565 if (offset < 0) { 9566 minTop = mTop + offset; 9567 maxBottom = mBottom; 9568 yLoc = offset; 9569 } else { 9570 minTop = mTop; 9571 maxBottom = mBottom + offset; 9572 yLoc = 0; 9573 } 9574 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9575 p.invalidateChild(this, r); 9576 } 9577 } 9578 } else { 9579 invalidateViewProperty(false, false); 9580 } 9581 9582 mTop += offset; 9583 mBottom += offset; 9584 if (mDisplayList != null) { 9585 mDisplayList.offsetTopBottom(offset); 9586 invalidateViewProperty(false, false); 9587 } else { 9588 if (!matrixIsIdentity) { 9589 invalidateViewProperty(false, true); 9590 } 9591 invalidateParentIfNeeded(); 9592 } 9593 } 9594 } 9595 9596 /** 9597 * Offset this view's horizontal location by the specified amount of pixels. 9598 * 9599 * @param offset the numer of pixels to offset the view by 9600 */ 9601 public void offsetLeftAndRight(int offset) { 9602 if (offset != 0) { 9603 updateMatrix(); 9604 final boolean matrixIsIdentity = mTransformationInfo == null 9605 || mTransformationInfo.mMatrixIsIdentity; 9606 if (matrixIsIdentity) { 9607 if (mDisplayList != null) { 9608 invalidateViewProperty(false, false); 9609 } else { 9610 final ViewParent p = mParent; 9611 if (p != null && mAttachInfo != null) { 9612 final Rect r = mAttachInfo.mTmpInvalRect; 9613 int minLeft; 9614 int maxRight; 9615 if (offset < 0) { 9616 minLeft = mLeft + offset; 9617 maxRight = mRight; 9618 } else { 9619 minLeft = mLeft; 9620 maxRight = mRight + offset; 9621 } 9622 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9623 p.invalidateChild(this, r); 9624 } 9625 } 9626 } else { 9627 invalidateViewProperty(false, false); 9628 } 9629 9630 mLeft += offset; 9631 mRight += offset; 9632 if (mDisplayList != null) { 9633 mDisplayList.offsetLeftRight(offset); 9634 invalidateViewProperty(false, false); 9635 } else { 9636 if (!matrixIsIdentity) { 9637 invalidateViewProperty(false, true); 9638 } 9639 invalidateParentIfNeeded(); 9640 } 9641 } 9642 } 9643 9644 /** 9645 * Get the LayoutParams associated with this view. All views should have 9646 * layout parameters. These supply parameters to the <i>parent</i> of this 9647 * view specifying how it should be arranged. There are many subclasses of 9648 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9649 * of ViewGroup that are responsible for arranging their children. 9650 * 9651 * This method may return null if this View is not attached to a parent 9652 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9653 * was not invoked successfully. When a View is attached to a parent 9654 * ViewGroup, this method must not return null. 9655 * 9656 * @return The LayoutParams associated with this view, or null if no 9657 * parameters have been set yet 9658 */ 9659 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9660 public ViewGroup.LayoutParams getLayoutParams() { 9661 return mLayoutParams; 9662 } 9663 9664 /** 9665 * Set the layout parameters associated with this view. These supply 9666 * parameters to the <i>parent</i> of this view specifying how it should be 9667 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9668 * correspond to the different subclasses of ViewGroup that are responsible 9669 * for arranging their children. 9670 * 9671 * @param params The layout parameters for this view, cannot be null 9672 */ 9673 public void setLayoutParams(ViewGroup.LayoutParams params) { 9674 if (params == null) { 9675 throw new NullPointerException("Layout parameters cannot be null"); 9676 } 9677 mLayoutParams = params; 9678 if (mParent instanceof ViewGroup) { 9679 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9680 } 9681 requestLayout(); 9682 } 9683 9684 /** 9685 * Set the scrolled position of your view. This will cause a call to 9686 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9687 * invalidated. 9688 * @param x the x position to scroll to 9689 * @param y the y position to scroll to 9690 */ 9691 public void scrollTo(int x, int y) { 9692 if (mScrollX != x || mScrollY != y) { 9693 int oldX = mScrollX; 9694 int oldY = mScrollY; 9695 mScrollX = x; 9696 mScrollY = y; 9697 invalidateParentCaches(); 9698 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9699 if (!awakenScrollBars()) { 9700 postInvalidateOnAnimation(); 9701 } 9702 } 9703 } 9704 9705 /** 9706 * Move the scrolled position of your view. This will cause a call to 9707 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9708 * invalidated. 9709 * @param x the amount of pixels to scroll by horizontally 9710 * @param y the amount of pixels to scroll by vertically 9711 */ 9712 public void scrollBy(int x, int y) { 9713 scrollTo(mScrollX + x, mScrollY + y); 9714 } 9715 9716 /** 9717 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9718 * animation to fade the scrollbars out after a default delay. If a subclass 9719 * provides animated scrolling, the start delay should equal the duration 9720 * of the scrolling animation.</p> 9721 * 9722 * <p>The animation starts only if at least one of the scrollbars is 9723 * enabled, 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 9727 * caller should not call {@link #invalidate()}.</p> 9728 * 9729 * <p>This method should be invoked every time a subclass directly updates 9730 * the scroll parameters.</p> 9731 * 9732 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9733 * and {@link #scrollTo(int, int)}.</p> 9734 * 9735 * @return true if the animation is played, false otherwise 9736 * 9737 * @see #awakenScrollBars(int) 9738 * @see #scrollBy(int, int) 9739 * @see #scrollTo(int, int) 9740 * @see #isHorizontalScrollBarEnabled() 9741 * @see #isVerticalScrollBarEnabled() 9742 * @see #setHorizontalScrollBarEnabled(boolean) 9743 * @see #setVerticalScrollBarEnabled(boolean) 9744 */ 9745 protected boolean awakenScrollBars() { 9746 return mScrollCache != null && 9747 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9748 } 9749 9750 /** 9751 * Trigger the scrollbars to draw. 9752 * This method differs from awakenScrollBars() only in its default duration. 9753 * initialAwakenScrollBars() will show the scroll bars for longer than 9754 * usual to give the user more of a chance to notice them. 9755 * 9756 * @return true if the animation is played, false otherwise. 9757 */ 9758 private boolean initialAwakenScrollBars() { 9759 return mScrollCache != null && 9760 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9761 } 9762 9763 /** 9764 * <p> 9765 * Trigger the scrollbars to draw. When invoked this method starts an 9766 * animation to fade the scrollbars out after a fixed delay. If a subclass 9767 * provides animated scrolling, the start delay should equal the duration of 9768 * the scrolling animation. 9769 * </p> 9770 * 9771 * <p> 9772 * The animation starts only if at least one of the scrollbars is enabled, 9773 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9774 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9775 * this method returns true, and false otherwise. If the animation is 9776 * started, this method calls {@link #invalidate()}; in that case the caller 9777 * should not call {@link #invalidate()}. 9778 * </p> 9779 * 9780 * <p> 9781 * This method should be invoked everytime a subclass directly updates the 9782 * scroll parameters. 9783 * </p> 9784 * 9785 * @param startDelay the delay, in milliseconds, after which the animation 9786 * should start; when the delay is 0, the animation starts 9787 * immediately 9788 * @return true if the animation is played, false otherwise 9789 * 9790 * @see #scrollBy(int, int) 9791 * @see #scrollTo(int, int) 9792 * @see #isHorizontalScrollBarEnabled() 9793 * @see #isVerticalScrollBarEnabled() 9794 * @see #setHorizontalScrollBarEnabled(boolean) 9795 * @see #setVerticalScrollBarEnabled(boolean) 9796 */ 9797 protected boolean awakenScrollBars(int startDelay) { 9798 return awakenScrollBars(startDelay, true); 9799 } 9800 9801 /** 9802 * <p> 9803 * Trigger the scrollbars to draw. When invoked this method starts an 9804 * animation to fade the scrollbars out after a fixed delay. If a subclass 9805 * provides animated scrolling, the start delay should equal the duration of 9806 * the scrolling animation. 9807 * </p> 9808 * 9809 * <p> 9810 * The animation starts only if at least one of the scrollbars is enabled, 9811 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9812 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9813 * this method returns true, and false otherwise. If the animation is 9814 * started, this method calls {@link #invalidate()} if the invalidate parameter 9815 * is set to true; in that case the caller 9816 * should not call {@link #invalidate()}. 9817 * </p> 9818 * 9819 * <p> 9820 * This method should be invoked everytime a subclass directly updates the 9821 * scroll parameters. 9822 * </p> 9823 * 9824 * @param startDelay the delay, in milliseconds, after which the animation 9825 * should start; when the delay is 0, the animation starts 9826 * immediately 9827 * 9828 * @param invalidate Wheter this method should call invalidate 9829 * 9830 * @return true if the animation is played, false otherwise 9831 * 9832 * @see #scrollBy(int, int) 9833 * @see #scrollTo(int, int) 9834 * @see #isHorizontalScrollBarEnabled() 9835 * @see #isVerticalScrollBarEnabled() 9836 * @see #setHorizontalScrollBarEnabled(boolean) 9837 * @see #setVerticalScrollBarEnabled(boolean) 9838 */ 9839 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9840 final ScrollabilityCache scrollCache = mScrollCache; 9841 9842 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9843 return false; 9844 } 9845 9846 if (scrollCache.scrollBar == null) { 9847 scrollCache.scrollBar = new ScrollBarDrawable(); 9848 } 9849 9850 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9851 9852 if (invalidate) { 9853 // Invalidate to show the scrollbars 9854 postInvalidateOnAnimation(); 9855 } 9856 9857 if (scrollCache.state == ScrollabilityCache.OFF) { 9858 // FIXME: this is copied from WindowManagerService. 9859 // We should get this value from the system when it 9860 // is possible to do so. 9861 final int KEY_REPEAT_FIRST_DELAY = 750; 9862 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9863 } 9864 9865 // Tell mScrollCache when we should start fading. This may 9866 // extend the fade start time if one was already scheduled 9867 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9868 scrollCache.fadeStartTime = fadeStartTime; 9869 scrollCache.state = ScrollabilityCache.ON; 9870 9871 // Schedule our fader to run, unscheduling any old ones first 9872 if (mAttachInfo != null) { 9873 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9874 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9875 } 9876 9877 return true; 9878 } 9879 9880 return false; 9881 } 9882 9883 /** 9884 * Do not invalidate views which are not visible and which are not running an animation. They 9885 * will not get drawn and they should not set dirty flags as if they will be drawn 9886 */ 9887 private boolean skipInvalidate() { 9888 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9889 (!(mParent instanceof ViewGroup) || 9890 !((ViewGroup) mParent).isViewTransitioning(this)); 9891 } 9892 /** 9893 * Mark the area defined by dirty as needing to be drawn. If the view is 9894 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9895 * in the future. This must be called from a UI thread. To call from a non-UI 9896 * thread, call {@link #postInvalidate()}. 9897 * 9898 * WARNING: This method is destructive to dirty. 9899 * @param dirty the rectangle representing the bounds of the dirty region 9900 */ 9901 public void invalidate(Rect dirty) { 9902 if (skipInvalidate()) { 9903 return; 9904 } 9905 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9906 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9907 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9908 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9909 mPrivateFlags |= INVALIDATED; 9910 mPrivateFlags |= DIRTY; 9911 final ViewParent p = mParent; 9912 final AttachInfo ai = mAttachInfo; 9913 //noinspection PointlessBooleanExpression,ConstantConditions 9914 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9915 if (p != null && ai != null && ai.mHardwareAccelerated) { 9916 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9917 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9918 p.invalidateChild(this, null); 9919 return; 9920 } 9921 } 9922 if (p != null && ai != null) { 9923 final int scrollX = mScrollX; 9924 final int scrollY = mScrollY; 9925 final Rect r = ai.mTmpInvalRect; 9926 r.set(dirty.left - scrollX, dirty.top - scrollY, 9927 dirty.right - scrollX, dirty.bottom - scrollY); 9928 mParent.invalidateChild(this, r); 9929 } 9930 } 9931 } 9932 9933 /** 9934 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9935 * The coordinates of the dirty rect are relative to the view. 9936 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9937 * will be called at some point in the future. This must be called from 9938 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9939 * @param l the left position of the dirty region 9940 * @param t the top position of the dirty region 9941 * @param r the right position of the dirty region 9942 * @param b the bottom position of the dirty region 9943 */ 9944 public void invalidate(int l, int t, int r, int b) { 9945 if (skipInvalidate()) { 9946 return; 9947 } 9948 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9949 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9950 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9951 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9952 mPrivateFlags |= INVALIDATED; 9953 mPrivateFlags |= DIRTY; 9954 final ViewParent p = mParent; 9955 final AttachInfo ai = mAttachInfo; 9956 //noinspection PointlessBooleanExpression,ConstantConditions 9957 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9958 if (p != null && ai != null && ai.mHardwareAccelerated) { 9959 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9960 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9961 p.invalidateChild(this, null); 9962 return; 9963 } 9964 } 9965 if (p != null && ai != null && l < r && t < b) { 9966 final int scrollX = mScrollX; 9967 final int scrollY = mScrollY; 9968 final Rect tmpr = ai.mTmpInvalRect; 9969 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9970 p.invalidateChild(this, tmpr); 9971 } 9972 } 9973 } 9974 9975 /** 9976 * Invalidate the whole view. If the view is visible, 9977 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9978 * the future. This must be called from a UI thread. To call from a non-UI thread, 9979 * call {@link #postInvalidate()}. 9980 */ 9981 public void invalidate() { 9982 invalidate(true); 9983 } 9984 9985 /** 9986 * This is where the invalidate() work actually happens. A full invalidate() 9987 * causes the drawing cache to be invalidated, but this function can be called with 9988 * invalidateCache set to false to skip that invalidation step for cases that do not 9989 * need it (for example, a component that remains at the same dimensions with the same 9990 * content). 9991 * 9992 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9993 * well. This is usually true for a full invalidate, but may be set to false if the 9994 * View's contents or dimensions have not changed. 9995 */ 9996 void invalidate(boolean invalidateCache) { 9997 if (skipInvalidate()) { 9998 return; 9999 } 10000 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 10001 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 10002 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 10003 mLastIsOpaque = isOpaque(); 10004 mPrivateFlags &= ~DRAWN; 10005 mPrivateFlags |= DIRTY; 10006 if (invalidateCache) { 10007 mPrivateFlags |= INVALIDATED; 10008 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10009 } 10010 final AttachInfo ai = mAttachInfo; 10011 final ViewParent p = mParent; 10012 //noinspection PointlessBooleanExpression,ConstantConditions 10013 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10014 if (p != null && ai != null && ai.mHardwareAccelerated) { 10015 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10016 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10017 p.invalidateChild(this, null); 10018 return; 10019 } 10020 } 10021 10022 if (p != null && ai != null) { 10023 final Rect r = ai.mTmpInvalRect; 10024 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10025 // Don't call invalidate -- we don't want to internally scroll 10026 // our own bounds 10027 p.invalidateChild(this, r); 10028 } 10029 } 10030 } 10031 10032 /** 10033 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10034 * set any flags or handle all of the cases handled by the default invalidation methods. 10035 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10036 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10037 * walk up the hierarchy, transforming the dirty rect as necessary. 10038 * 10039 * The method also handles normal invalidation logic if display list properties are not 10040 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10041 * backup approach, to handle these cases used in the various property-setting methods. 10042 * 10043 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10044 * are not being used in this view 10045 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10046 * list properties are not being used in this view 10047 */ 10048 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10049 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10050 if (invalidateParent) { 10051 invalidateParentCaches(); 10052 } 10053 if (forceRedraw) { 10054 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10055 } 10056 invalidate(false); 10057 } else { 10058 final AttachInfo ai = mAttachInfo; 10059 final ViewParent p = mParent; 10060 if (p != null && ai != null) { 10061 final Rect r = ai.mTmpInvalRect; 10062 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10063 if (mParent instanceof ViewGroup) { 10064 ((ViewGroup) mParent).invalidateChildFast(this, r); 10065 } else { 10066 mParent.invalidateChild(this, r); 10067 } 10068 } 10069 } 10070 } 10071 10072 /** 10073 * Utility method to transform a given Rect by the current matrix of this view. 10074 */ 10075 void transformRect(final Rect rect) { 10076 if (!getMatrix().isIdentity()) { 10077 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10078 boundingRect.set(rect); 10079 getMatrix().mapRect(boundingRect); 10080 rect.set((int) (boundingRect.left - 0.5f), 10081 (int) (boundingRect.top - 0.5f), 10082 (int) (boundingRect.right + 0.5f), 10083 (int) (boundingRect.bottom + 0.5f)); 10084 } 10085 } 10086 10087 /** 10088 * Used to indicate that the parent of this view should clear its caches. This functionality 10089 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10090 * which is necessary when various parent-managed properties of the view change, such as 10091 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10092 * clears the parent caches and does not causes an invalidate event. 10093 * 10094 * @hide 10095 */ 10096 protected void invalidateParentCaches() { 10097 if (mParent instanceof View) { 10098 ((View) mParent).mPrivateFlags |= INVALIDATED; 10099 } 10100 } 10101 10102 /** 10103 * Used to indicate that the parent of this view should be invalidated. This functionality 10104 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10105 * which is necessary when various parent-managed properties of the view change, such as 10106 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10107 * an invalidation event to the parent. 10108 * 10109 * @hide 10110 */ 10111 protected void invalidateParentIfNeeded() { 10112 if (isHardwareAccelerated() && mParent instanceof View) { 10113 ((View) mParent).invalidate(true); 10114 } 10115 } 10116 10117 /** 10118 * Indicates whether this View is opaque. An opaque View guarantees that it will 10119 * draw all the pixels overlapping its bounds using a fully opaque color. 10120 * 10121 * Subclasses of View should override this method whenever possible to indicate 10122 * whether an instance is opaque. Opaque Views are treated in a special way by 10123 * the View hierarchy, possibly allowing it to perform optimizations during 10124 * invalidate/draw passes. 10125 * 10126 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10127 */ 10128 @ViewDebug.ExportedProperty(category = "drawing") 10129 public boolean isOpaque() { 10130 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10131 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10132 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10133 } 10134 10135 /** 10136 * @hide 10137 */ 10138 protected void computeOpaqueFlags() { 10139 // Opaque if: 10140 // - Has a background 10141 // - Background is opaque 10142 // - Doesn't have scrollbars or scrollbars are inside overlay 10143 10144 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10145 mPrivateFlags |= OPAQUE_BACKGROUND; 10146 } else { 10147 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10148 } 10149 10150 final int flags = mViewFlags; 10151 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10152 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10153 mPrivateFlags |= OPAQUE_SCROLLBARS; 10154 } else { 10155 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10156 } 10157 } 10158 10159 /** 10160 * @hide 10161 */ 10162 protected boolean hasOpaqueScrollbars() { 10163 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10164 } 10165 10166 /** 10167 * @return A handler associated with the thread running the View. This 10168 * handler can be used to pump events in the UI events queue. 10169 */ 10170 public Handler getHandler() { 10171 if (mAttachInfo != null) { 10172 return mAttachInfo.mHandler; 10173 } 10174 return null; 10175 } 10176 10177 /** 10178 * Gets the view root associated with the View. 10179 * @return The view root, or null if none. 10180 * @hide 10181 */ 10182 public ViewRootImpl getViewRootImpl() { 10183 if (mAttachInfo != null) { 10184 return mAttachInfo.mViewRootImpl; 10185 } 10186 return null; 10187 } 10188 10189 /** 10190 * <p>Causes the Runnable to be added to the message queue. 10191 * The runnable will be run on the user interface thread.</p> 10192 * 10193 * <p>This method can be invoked from outside of the UI thread 10194 * only when this View is attached to a window.</p> 10195 * 10196 * @param action The Runnable that will be executed. 10197 * 10198 * @return Returns true if the Runnable was successfully placed in to the 10199 * message queue. Returns false on failure, usually because the 10200 * looper processing the message queue is exiting. 10201 * 10202 * @see #postDelayed 10203 * @see #removeCallbacks 10204 */ 10205 public boolean post(Runnable action) { 10206 final AttachInfo attachInfo = mAttachInfo; 10207 if (attachInfo != null) { 10208 return attachInfo.mHandler.post(action); 10209 } 10210 // Assume that post will succeed later 10211 ViewRootImpl.getRunQueue().post(action); 10212 return true; 10213 } 10214 10215 /** 10216 * <p>Causes the Runnable to be added to the message queue, to be run 10217 * after the specified amount of time elapses. 10218 * The runnable will be run on the user interface thread.</p> 10219 * 10220 * <p>This method can be invoked from outside of the UI thread 10221 * only when this View is attached to a window.</p> 10222 * 10223 * @param action The Runnable that will be executed. 10224 * @param delayMillis The delay (in milliseconds) until the Runnable 10225 * will be executed. 10226 * 10227 * @return true if the Runnable was successfully placed in to the 10228 * message queue. Returns false on failure, usually because the 10229 * looper processing the message queue is exiting. Note that a 10230 * result of true does not mean the Runnable will be processed -- 10231 * if the looper is quit before the delivery time of the message 10232 * occurs then the message will be dropped. 10233 * 10234 * @see #post 10235 * @see #removeCallbacks 10236 */ 10237 public boolean postDelayed(Runnable action, long delayMillis) { 10238 final AttachInfo attachInfo = mAttachInfo; 10239 if (attachInfo != null) { 10240 return attachInfo.mHandler.postDelayed(action, delayMillis); 10241 } 10242 // Assume that post will succeed later 10243 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10244 return true; 10245 } 10246 10247 /** 10248 * <p>Causes the Runnable to execute on the next animation time step. 10249 * The runnable will be run on the user interface thread.</p> 10250 * 10251 * <p>This method can be invoked from outside of the UI thread 10252 * only when this View is attached to a window.</p> 10253 * 10254 * @param action The Runnable that will be executed. 10255 * 10256 * @see #postOnAnimationDelayed 10257 * @see #removeCallbacks 10258 */ 10259 public void postOnAnimation(Runnable action) { 10260 final AttachInfo attachInfo = mAttachInfo; 10261 if (attachInfo != null) { 10262 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10263 Choreographer.CALLBACK_ANIMATION, action, null); 10264 } else { 10265 // Assume that post will succeed later 10266 ViewRootImpl.getRunQueue().post(action); 10267 } 10268 } 10269 10270 /** 10271 * <p>Causes the Runnable to execute on the next animation time step, 10272 * after the specified amount of time elapses. 10273 * The runnable will be run on the user interface thread.</p> 10274 * 10275 * <p>This method can be invoked from outside of the UI thread 10276 * only when this View is attached to a window.</p> 10277 * 10278 * @param action The Runnable that will be executed. 10279 * @param delayMillis The delay (in milliseconds) until the Runnable 10280 * will be executed. 10281 * 10282 * @see #postOnAnimation 10283 * @see #removeCallbacks 10284 */ 10285 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10286 final AttachInfo attachInfo = mAttachInfo; 10287 if (attachInfo != null) { 10288 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10289 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10290 } else { 10291 // Assume that post will succeed later 10292 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10293 } 10294 } 10295 10296 /** 10297 * <p>Removes the specified Runnable from the message queue.</p> 10298 * 10299 * <p>This method can be invoked from outside of the UI thread 10300 * only when this View is attached to a window.</p> 10301 * 10302 * @param action The Runnable to remove from the message handling queue 10303 * 10304 * @return true if this view could ask the Handler to remove the Runnable, 10305 * false otherwise. When the returned value is true, the Runnable 10306 * may or may not have been actually removed from the message queue 10307 * (for instance, if the Runnable was not in the queue already.) 10308 * 10309 * @see #post 10310 * @see #postDelayed 10311 * @see #postOnAnimation 10312 * @see #postOnAnimationDelayed 10313 */ 10314 public boolean removeCallbacks(Runnable action) { 10315 if (action != null) { 10316 final AttachInfo attachInfo = mAttachInfo; 10317 if (attachInfo != null) { 10318 attachInfo.mHandler.removeCallbacks(action); 10319 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10320 Choreographer.CALLBACK_ANIMATION, action, null); 10321 } else { 10322 // Assume that post will succeed later 10323 ViewRootImpl.getRunQueue().removeCallbacks(action); 10324 } 10325 } 10326 return true; 10327 } 10328 10329 /** 10330 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10331 * Use this to invalidate the View from a non-UI thread.</p> 10332 * 10333 * <p>This method can be invoked from outside of the UI thread 10334 * only when this View is attached to a window.</p> 10335 * 10336 * @see #invalidate() 10337 * @see #postInvalidateDelayed(long) 10338 */ 10339 public void postInvalidate() { 10340 postInvalidateDelayed(0); 10341 } 10342 10343 /** 10344 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10345 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10346 * 10347 * <p>This method can be invoked from outside of the UI thread 10348 * only when this View is attached to a window.</p> 10349 * 10350 * @param left The left coordinate of the rectangle to invalidate. 10351 * @param top The top coordinate of the rectangle to invalidate. 10352 * @param right The right coordinate of the rectangle to invalidate. 10353 * @param bottom The bottom coordinate of the rectangle to invalidate. 10354 * 10355 * @see #invalidate(int, int, int, int) 10356 * @see #invalidate(Rect) 10357 * @see #postInvalidateDelayed(long, int, int, int, int) 10358 */ 10359 public void postInvalidate(int left, int top, int right, int bottom) { 10360 postInvalidateDelayed(0, left, top, right, bottom); 10361 } 10362 10363 /** 10364 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10365 * loop. Waits for the specified amount of time.</p> 10366 * 10367 * <p>This method can be invoked from outside of the UI thread 10368 * only when this View is attached to a window.</p> 10369 * 10370 * @param delayMilliseconds the duration in milliseconds to delay the 10371 * invalidation by 10372 * 10373 * @see #invalidate() 10374 * @see #postInvalidate() 10375 */ 10376 public void postInvalidateDelayed(long delayMilliseconds) { 10377 // We try only with the AttachInfo because there's no point in invalidating 10378 // if we are not attached to our window 10379 final AttachInfo attachInfo = mAttachInfo; 10380 if (attachInfo != null) { 10381 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10382 } 10383 } 10384 10385 /** 10386 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10387 * through the event loop. Waits for the specified amount of time.</p> 10388 * 10389 * <p>This method can be invoked from outside of the UI thread 10390 * only when this View is attached to a window.</p> 10391 * 10392 * @param delayMilliseconds the duration in milliseconds to delay the 10393 * invalidation by 10394 * @param left The left coordinate of the rectangle to invalidate. 10395 * @param top The top coordinate of the rectangle to invalidate. 10396 * @param right The right coordinate of the rectangle to invalidate. 10397 * @param bottom The bottom coordinate of the rectangle to invalidate. 10398 * 10399 * @see #invalidate(int, int, int, int) 10400 * @see #invalidate(Rect) 10401 * @see #postInvalidate(int, int, int, int) 10402 */ 10403 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10404 int right, int bottom) { 10405 10406 // We try only with the AttachInfo because there's no point in invalidating 10407 // if we are not attached to our window 10408 final AttachInfo attachInfo = mAttachInfo; 10409 if (attachInfo != null) { 10410 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10411 info.target = this; 10412 info.left = left; 10413 info.top = top; 10414 info.right = right; 10415 info.bottom = bottom; 10416 10417 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10418 } 10419 } 10420 10421 /** 10422 * <p>Cause an invalidate to happen on the next animation time step, typically the 10423 * next display frame.</p> 10424 * 10425 * <p>This method can be invoked from outside of the UI thread 10426 * only when this View is attached to a window.</p> 10427 * 10428 * @see #invalidate() 10429 */ 10430 public void postInvalidateOnAnimation() { 10431 // We try only with the AttachInfo because there's no point in invalidating 10432 // if we are not attached to our window 10433 final AttachInfo attachInfo = mAttachInfo; 10434 if (attachInfo != null) { 10435 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10436 } 10437 } 10438 10439 /** 10440 * <p>Cause an invalidate of the specified area to happen on the next animation 10441 * time step, typically the next display frame.</p> 10442 * 10443 * <p>This method can be invoked from outside of the UI thread 10444 * only when this View is attached to a window.</p> 10445 * 10446 * @param left The left coordinate of the rectangle to invalidate. 10447 * @param top The top coordinate of the rectangle to invalidate. 10448 * @param right The right coordinate of the rectangle to invalidate. 10449 * @param bottom The bottom coordinate of the rectangle to invalidate. 10450 * 10451 * @see #invalidate(int, int, int, int) 10452 * @see #invalidate(Rect) 10453 */ 10454 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10455 // We try only with the AttachInfo because there's no point in invalidating 10456 // if we are not attached to our window 10457 final AttachInfo attachInfo = mAttachInfo; 10458 if (attachInfo != null) { 10459 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10460 info.target = this; 10461 info.left = left; 10462 info.top = top; 10463 info.right = right; 10464 info.bottom = bottom; 10465 10466 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10467 } 10468 } 10469 10470 /** 10471 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10472 * This event is sent at most once every 10473 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10474 */ 10475 private void postSendViewScrolledAccessibilityEventCallback() { 10476 if (mSendViewScrolledAccessibilityEvent == null) { 10477 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10478 } 10479 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10480 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10481 postDelayed(mSendViewScrolledAccessibilityEvent, 10482 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10483 } 10484 } 10485 10486 /** 10487 * Called by a parent to request that a child update its values for mScrollX 10488 * and mScrollY if necessary. This will typically be done if the child is 10489 * animating a scroll using a {@link android.widget.Scroller Scroller} 10490 * object. 10491 */ 10492 public void computeScroll() { 10493 } 10494 10495 /** 10496 * <p>Indicate whether the horizontal edges are faded when the view is 10497 * scrolled horizontally.</p> 10498 * 10499 * @return true if the horizontal edges should are faded on scroll, false 10500 * otherwise 10501 * 10502 * @see #setHorizontalFadingEdgeEnabled(boolean) 10503 * 10504 * @attr ref android.R.styleable#View_requiresFadingEdge 10505 */ 10506 public boolean isHorizontalFadingEdgeEnabled() { 10507 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10508 } 10509 10510 /** 10511 * <p>Define whether the horizontal edges should be faded when this view 10512 * is scrolled horizontally.</p> 10513 * 10514 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10515 * be faded when the view is scrolled 10516 * horizontally 10517 * 10518 * @see #isHorizontalFadingEdgeEnabled() 10519 * 10520 * @attr ref android.R.styleable#View_requiresFadingEdge 10521 */ 10522 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10523 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10524 if (horizontalFadingEdgeEnabled) { 10525 initScrollCache(); 10526 } 10527 10528 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10529 } 10530 } 10531 10532 /** 10533 * <p>Indicate whether the vertical edges are faded when the view is 10534 * scrolled horizontally.</p> 10535 * 10536 * @return true if the vertical edges should are faded on scroll, false 10537 * otherwise 10538 * 10539 * @see #setVerticalFadingEdgeEnabled(boolean) 10540 * 10541 * @attr ref android.R.styleable#View_requiresFadingEdge 10542 */ 10543 public boolean isVerticalFadingEdgeEnabled() { 10544 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10545 } 10546 10547 /** 10548 * <p>Define whether the vertical edges should be faded when this view 10549 * is scrolled vertically.</p> 10550 * 10551 * @param verticalFadingEdgeEnabled true if the vertical edges should 10552 * be faded when the view is scrolled 10553 * vertically 10554 * 10555 * @see #isVerticalFadingEdgeEnabled() 10556 * 10557 * @attr ref android.R.styleable#View_requiresFadingEdge 10558 */ 10559 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10560 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10561 if (verticalFadingEdgeEnabled) { 10562 initScrollCache(); 10563 } 10564 10565 mViewFlags ^= FADING_EDGE_VERTICAL; 10566 } 10567 } 10568 10569 /** 10570 * Returns the strength, or intensity, of the top faded edge. The strength is 10571 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10572 * returns 0.0 or 1.0 but no value in between. 10573 * 10574 * Subclasses should override this method to provide a smoother fade transition 10575 * when scrolling occurs. 10576 * 10577 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10578 */ 10579 protected float getTopFadingEdgeStrength() { 10580 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10581 } 10582 10583 /** 10584 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10585 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10586 * returns 0.0 or 1.0 but no value in between. 10587 * 10588 * Subclasses should override this method to provide a smoother fade transition 10589 * when scrolling occurs. 10590 * 10591 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10592 */ 10593 protected float getBottomFadingEdgeStrength() { 10594 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10595 computeVerticalScrollRange() ? 1.0f : 0.0f; 10596 } 10597 10598 /** 10599 * Returns the strength, or intensity, of the left faded edge. The strength is 10600 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10601 * returns 0.0 or 1.0 but no value in between. 10602 * 10603 * Subclasses should override this method to provide a smoother fade transition 10604 * when scrolling occurs. 10605 * 10606 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10607 */ 10608 protected float getLeftFadingEdgeStrength() { 10609 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10610 } 10611 10612 /** 10613 * Returns the strength, or intensity, of the right faded edge. The strength is 10614 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10615 * returns 0.0 or 1.0 but no value in between. 10616 * 10617 * Subclasses should override this method to provide a smoother fade transition 10618 * when scrolling occurs. 10619 * 10620 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10621 */ 10622 protected float getRightFadingEdgeStrength() { 10623 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10624 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10625 } 10626 10627 /** 10628 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10629 * scrollbar is not drawn by default.</p> 10630 * 10631 * @return true if the horizontal scrollbar should be painted, false 10632 * otherwise 10633 * 10634 * @see #setHorizontalScrollBarEnabled(boolean) 10635 */ 10636 public boolean isHorizontalScrollBarEnabled() { 10637 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10638 } 10639 10640 /** 10641 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10642 * scrollbar is not drawn by default.</p> 10643 * 10644 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10645 * be painted 10646 * 10647 * @see #isHorizontalScrollBarEnabled() 10648 */ 10649 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10650 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10651 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10652 computeOpaqueFlags(); 10653 resolvePadding(); 10654 } 10655 } 10656 10657 /** 10658 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10659 * scrollbar is not drawn by default.</p> 10660 * 10661 * @return true if the vertical scrollbar should be painted, false 10662 * otherwise 10663 * 10664 * @see #setVerticalScrollBarEnabled(boolean) 10665 */ 10666 public boolean isVerticalScrollBarEnabled() { 10667 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10668 } 10669 10670 /** 10671 * <p>Define whether the vertical scrollbar should be drawn or not. The 10672 * scrollbar is not drawn by default.</p> 10673 * 10674 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10675 * be painted 10676 * 10677 * @see #isVerticalScrollBarEnabled() 10678 */ 10679 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10680 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10681 mViewFlags ^= SCROLLBARS_VERTICAL; 10682 computeOpaqueFlags(); 10683 resolvePadding(); 10684 } 10685 } 10686 10687 /** 10688 * @hide 10689 */ 10690 protected void recomputePadding() { 10691 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10692 } 10693 10694 /** 10695 * Define whether scrollbars will fade when the view is not scrolling. 10696 * 10697 * @param fadeScrollbars wheter to enable fading 10698 * 10699 * @attr ref android.R.styleable#View_fadeScrollbars 10700 */ 10701 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10702 initScrollCache(); 10703 final ScrollabilityCache scrollabilityCache = mScrollCache; 10704 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10705 if (fadeScrollbars) { 10706 scrollabilityCache.state = ScrollabilityCache.OFF; 10707 } else { 10708 scrollabilityCache.state = ScrollabilityCache.ON; 10709 } 10710 } 10711 10712 /** 10713 * 10714 * Returns true if scrollbars will fade when this view is not scrolling 10715 * 10716 * @return true if scrollbar fading is enabled 10717 * 10718 * @attr ref android.R.styleable#View_fadeScrollbars 10719 */ 10720 public boolean isScrollbarFadingEnabled() { 10721 return mScrollCache != null && mScrollCache.fadeScrollBars; 10722 } 10723 10724 /** 10725 * 10726 * Returns the delay before scrollbars fade. 10727 * 10728 * @return the delay before scrollbars fade 10729 * 10730 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10731 */ 10732 public int getScrollBarDefaultDelayBeforeFade() { 10733 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10734 mScrollCache.scrollBarDefaultDelayBeforeFade; 10735 } 10736 10737 /** 10738 * Define the delay before scrollbars fade. 10739 * 10740 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10741 * 10742 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10743 */ 10744 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10745 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10746 } 10747 10748 /** 10749 * 10750 * Returns the scrollbar fade duration. 10751 * 10752 * @return the scrollbar fade duration 10753 * 10754 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10755 */ 10756 public int getScrollBarFadeDuration() { 10757 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10758 mScrollCache.scrollBarFadeDuration; 10759 } 10760 10761 /** 10762 * Define the scrollbar fade duration. 10763 * 10764 * @param scrollBarFadeDuration - the scrollbar fade duration 10765 * 10766 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10767 */ 10768 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10769 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10770 } 10771 10772 /** 10773 * 10774 * Returns the scrollbar size. 10775 * 10776 * @return the scrollbar size 10777 * 10778 * @attr ref android.R.styleable#View_scrollbarSize 10779 */ 10780 public int getScrollBarSize() { 10781 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10782 mScrollCache.scrollBarSize; 10783 } 10784 10785 /** 10786 * Define the scrollbar size. 10787 * 10788 * @param scrollBarSize - the scrollbar size 10789 * 10790 * @attr ref android.R.styleable#View_scrollbarSize 10791 */ 10792 public void setScrollBarSize(int scrollBarSize) { 10793 getScrollCache().scrollBarSize = scrollBarSize; 10794 } 10795 10796 /** 10797 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10798 * inset. When inset, they add to the padding of the view. And the scrollbars 10799 * can be drawn inside the padding area or on the edge of the view. For example, 10800 * if a view has a background drawable and you want to draw the scrollbars 10801 * inside the padding specified by the drawable, you can use 10802 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10803 * appear at the edge of the view, ignoring the padding, then you can use 10804 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10805 * @param style the style of the scrollbars. Should be one of 10806 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10807 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10808 * @see #SCROLLBARS_INSIDE_OVERLAY 10809 * @see #SCROLLBARS_INSIDE_INSET 10810 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10811 * @see #SCROLLBARS_OUTSIDE_INSET 10812 * 10813 * @attr ref android.R.styleable#View_scrollbarStyle 10814 */ 10815 public void setScrollBarStyle(int style) { 10816 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10817 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10818 computeOpaqueFlags(); 10819 resolvePadding(); 10820 } 10821 } 10822 10823 /** 10824 * <p>Returns the current scrollbar style.</p> 10825 * @return the current scrollbar style 10826 * @see #SCROLLBARS_INSIDE_OVERLAY 10827 * @see #SCROLLBARS_INSIDE_INSET 10828 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10829 * @see #SCROLLBARS_OUTSIDE_INSET 10830 * 10831 * @attr ref android.R.styleable#View_scrollbarStyle 10832 */ 10833 @ViewDebug.ExportedProperty(mapping = { 10834 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10835 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10836 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10837 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10838 }) 10839 public int getScrollBarStyle() { 10840 return mViewFlags & SCROLLBARS_STYLE_MASK; 10841 } 10842 10843 /** 10844 * <p>Compute the horizontal range that the horizontal scrollbar 10845 * represents.</p> 10846 * 10847 * <p>The range is expressed in arbitrary units that must be the same as the 10848 * units used by {@link #computeHorizontalScrollExtent()} and 10849 * {@link #computeHorizontalScrollOffset()}.</p> 10850 * 10851 * <p>The default range is the drawing width of this view.</p> 10852 * 10853 * @return the total horizontal range represented by the horizontal 10854 * scrollbar 10855 * 10856 * @see #computeHorizontalScrollExtent() 10857 * @see #computeHorizontalScrollOffset() 10858 * @see android.widget.ScrollBarDrawable 10859 */ 10860 protected int computeHorizontalScrollRange() { 10861 return getWidth(); 10862 } 10863 10864 /** 10865 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10866 * within the horizontal range. This value is used to compute the position 10867 * of the thumb within the scrollbar's track.</p> 10868 * 10869 * <p>The range is expressed in arbitrary units that must be the same as the 10870 * units used by {@link #computeHorizontalScrollRange()} and 10871 * {@link #computeHorizontalScrollExtent()}.</p> 10872 * 10873 * <p>The default offset is the scroll offset of this view.</p> 10874 * 10875 * @return the horizontal offset of the scrollbar's thumb 10876 * 10877 * @see #computeHorizontalScrollRange() 10878 * @see #computeHorizontalScrollExtent() 10879 * @see android.widget.ScrollBarDrawable 10880 */ 10881 protected int computeHorizontalScrollOffset() { 10882 return mScrollX; 10883 } 10884 10885 /** 10886 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10887 * within the horizontal range. This value is used to compute the length 10888 * of the thumb within the scrollbar's track.</p> 10889 * 10890 * <p>The range is expressed in arbitrary units that must be the same as the 10891 * units used by {@link #computeHorizontalScrollRange()} and 10892 * {@link #computeHorizontalScrollOffset()}.</p> 10893 * 10894 * <p>The default extent is the drawing width of this view.</p> 10895 * 10896 * @return the horizontal extent of the scrollbar's thumb 10897 * 10898 * @see #computeHorizontalScrollRange() 10899 * @see #computeHorizontalScrollOffset() 10900 * @see android.widget.ScrollBarDrawable 10901 */ 10902 protected int computeHorizontalScrollExtent() { 10903 return getWidth(); 10904 } 10905 10906 /** 10907 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10908 * 10909 * <p>The range is expressed in arbitrary units that must be the same as the 10910 * units used by {@link #computeVerticalScrollExtent()} and 10911 * {@link #computeVerticalScrollOffset()}.</p> 10912 * 10913 * @return the total vertical range represented by the vertical scrollbar 10914 * 10915 * <p>The default range is the drawing height of this view.</p> 10916 * 10917 * @see #computeVerticalScrollExtent() 10918 * @see #computeVerticalScrollOffset() 10919 * @see android.widget.ScrollBarDrawable 10920 */ 10921 protected int computeVerticalScrollRange() { 10922 return getHeight(); 10923 } 10924 10925 /** 10926 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10927 * within the horizontal range. This value is used to compute the position 10928 * of the thumb within the scrollbar's track.</p> 10929 * 10930 * <p>The range is expressed in arbitrary units that must be the same as the 10931 * units used by {@link #computeVerticalScrollRange()} and 10932 * {@link #computeVerticalScrollExtent()}.</p> 10933 * 10934 * <p>The default offset is the scroll offset of this view.</p> 10935 * 10936 * @return the vertical offset of the scrollbar's thumb 10937 * 10938 * @see #computeVerticalScrollRange() 10939 * @see #computeVerticalScrollExtent() 10940 * @see android.widget.ScrollBarDrawable 10941 */ 10942 protected int computeVerticalScrollOffset() { 10943 return mScrollY; 10944 } 10945 10946 /** 10947 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10948 * within the vertical range. This value is used to compute the length 10949 * of the thumb within the scrollbar's track.</p> 10950 * 10951 * <p>The range is expressed in arbitrary units that must be the same as the 10952 * units used by {@link #computeVerticalScrollRange()} and 10953 * {@link #computeVerticalScrollOffset()}.</p> 10954 * 10955 * <p>The default extent is the drawing height of this view.</p> 10956 * 10957 * @return the vertical extent of the scrollbar's thumb 10958 * 10959 * @see #computeVerticalScrollRange() 10960 * @see #computeVerticalScrollOffset() 10961 * @see android.widget.ScrollBarDrawable 10962 */ 10963 protected int computeVerticalScrollExtent() { 10964 return getHeight(); 10965 } 10966 10967 /** 10968 * Check if this view can be scrolled horizontally in a certain direction. 10969 * 10970 * @param direction Negative to check scrolling left, positive to check scrolling right. 10971 * @return true if this view can be scrolled in the specified direction, false otherwise. 10972 */ 10973 public boolean canScrollHorizontally(int direction) { 10974 final int offset = computeHorizontalScrollOffset(); 10975 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10976 if (range == 0) return false; 10977 if (direction < 0) { 10978 return offset > 0; 10979 } else { 10980 return offset < range - 1; 10981 } 10982 } 10983 10984 /** 10985 * Check if this view can be scrolled vertically in a certain direction. 10986 * 10987 * @param direction Negative to check scrolling up, positive to check scrolling down. 10988 * @return true if this view can be scrolled in the specified direction, false otherwise. 10989 */ 10990 public boolean canScrollVertically(int direction) { 10991 final int offset = computeVerticalScrollOffset(); 10992 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10993 if (range == 0) return false; 10994 if (direction < 0) { 10995 return offset > 0; 10996 } else { 10997 return offset < range - 1; 10998 } 10999 } 11000 11001 /** 11002 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11003 * scrollbars are painted only if they have been awakened first.</p> 11004 * 11005 * @param canvas the canvas on which to draw the scrollbars 11006 * 11007 * @see #awakenScrollBars(int) 11008 */ 11009 protected final void onDrawScrollBars(Canvas canvas) { 11010 // scrollbars are drawn only when the animation is running 11011 final ScrollabilityCache cache = mScrollCache; 11012 if (cache != null) { 11013 11014 int state = cache.state; 11015 11016 if (state == ScrollabilityCache.OFF) { 11017 return; 11018 } 11019 11020 boolean invalidate = false; 11021 11022 if (state == ScrollabilityCache.FADING) { 11023 // We're fading -- get our fade interpolation 11024 if (cache.interpolatorValues == null) { 11025 cache.interpolatorValues = new float[1]; 11026 } 11027 11028 float[] values = cache.interpolatorValues; 11029 11030 // Stops the animation if we're done 11031 if (cache.scrollBarInterpolator.timeToValues(values) == 11032 Interpolator.Result.FREEZE_END) { 11033 cache.state = ScrollabilityCache.OFF; 11034 } else { 11035 cache.scrollBar.setAlpha(Math.round(values[0])); 11036 } 11037 11038 // This will make the scroll bars inval themselves after 11039 // drawing. We only want this when we're fading so that 11040 // we prevent excessive redraws 11041 invalidate = true; 11042 } else { 11043 // We're just on -- but we may have been fading before so 11044 // reset alpha 11045 cache.scrollBar.setAlpha(255); 11046 } 11047 11048 11049 final int viewFlags = mViewFlags; 11050 11051 final boolean drawHorizontalScrollBar = 11052 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11053 final boolean drawVerticalScrollBar = 11054 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11055 && !isVerticalScrollBarHidden(); 11056 11057 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11058 final int width = mRight - mLeft; 11059 final int height = mBottom - mTop; 11060 11061 final ScrollBarDrawable scrollBar = cache.scrollBar; 11062 11063 final int scrollX = mScrollX; 11064 final int scrollY = mScrollY; 11065 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11066 11067 int left, top, right, bottom; 11068 11069 if (drawHorizontalScrollBar) { 11070 int size = scrollBar.getSize(false); 11071 if (size <= 0) { 11072 size = cache.scrollBarSize; 11073 } 11074 11075 scrollBar.setParameters(computeHorizontalScrollRange(), 11076 computeHorizontalScrollOffset(), 11077 computeHorizontalScrollExtent(), false); 11078 final int verticalScrollBarGap = drawVerticalScrollBar ? 11079 getVerticalScrollbarWidth() : 0; 11080 top = scrollY + height - size - (mUserPaddingBottom & inside); 11081 left = scrollX + (mPaddingLeft & inside); 11082 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11083 bottom = top + size; 11084 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11085 if (invalidate) { 11086 invalidate(left, top, right, bottom); 11087 } 11088 } 11089 11090 if (drawVerticalScrollBar) { 11091 int size = scrollBar.getSize(true); 11092 if (size <= 0) { 11093 size = cache.scrollBarSize; 11094 } 11095 11096 scrollBar.setParameters(computeVerticalScrollRange(), 11097 computeVerticalScrollOffset(), 11098 computeVerticalScrollExtent(), true); 11099 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11100 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11101 verticalScrollbarPosition = isLayoutRtl() ? 11102 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11103 } 11104 switch (verticalScrollbarPosition) { 11105 default: 11106 case SCROLLBAR_POSITION_RIGHT: 11107 left = scrollX + width - size - (mUserPaddingRight & inside); 11108 break; 11109 case SCROLLBAR_POSITION_LEFT: 11110 left = scrollX + (mUserPaddingLeft & inside); 11111 break; 11112 } 11113 top = scrollY + (mPaddingTop & inside); 11114 right = left + size; 11115 bottom = scrollY + height - (mUserPaddingBottom & inside); 11116 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11117 if (invalidate) { 11118 invalidate(left, top, right, bottom); 11119 } 11120 } 11121 } 11122 } 11123 } 11124 11125 /** 11126 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11127 * FastScroller is visible. 11128 * @return whether to temporarily hide the vertical scrollbar 11129 * @hide 11130 */ 11131 protected boolean isVerticalScrollBarHidden() { 11132 return false; 11133 } 11134 11135 /** 11136 * <p>Draw the horizontal scrollbar if 11137 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11138 * 11139 * @param canvas the canvas on which to draw the scrollbar 11140 * @param scrollBar the scrollbar's drawable 11141 * 11142 * @see #isHorizontalScrollBarEnabled() 11143 * @see #computeHorizontalScrollRange() 11144 * @see #computeHorizontalScrollExtent() 11145 * @see #computeHorizontalScrollOffset() 11146 * @see android.widget.ScrollBarDrawable 11147 * @hide 11148 */ 11149 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11150 int l, int t, int r, int b) { 11151 scrollBar.setBounds(l, t, r, b); 11152 scrollBar.draw(canvas); 11153 } 11154 11155 /** 11156 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11157 * returns true.</p> 11158 * 11159 * @param canvas the canvas on which to draw the scrollbar 11160 * @param scrollBar the scrollbar's drawable 11161 * 11162 * @see #isVerticalScrollBarEnabled() 11163 * @see #computeVerticalScrollRange() 11164 * @see #computeVerticalScrollExtent() 11165 * @see #computeVerticalScrollOffset() 11166 * @see android.widget.ScrollBarDrawable 11167 * @hide 11168 */ 11169 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11170 int l, int t, int r, int b) { 11171 scrollBar.setBounds(l, t, r, b); 11172 scrollBar.draw(canvas); 11173 } 11174 11175 /** 11176 * Implement this to do your drawing. 11177 * 11178 * @param canvas the canvas on which the background will be drawn 11179 */ 11180 protected void onDraw(Canvas canvas) { 11181 } 11182 11183 /* 11184 * Caller is responsible for calling requestLayout if necessary. 11185 * (This allows addViewInLayout to not request a new layout.) 11186 */ 11187 void assignParent(ViewParent parent) { 11188 if (mParent == null) { 11189 mParent = parent; 11190 } else if (parent == null) { 11191 mParent = null; 11192 } else { 11193 throw new RuntimeException("view " + this + " being added, but" 11194 + " it already has a parent"); 11195 } 11196 } 11197 11198 /** 11199 * This is called when the view is attached to a window. At this point it 11200 * has a Surface and will start drawing. Note that this function is 11201 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11202 * however it may be called any time before the first onDraw -- including 11203 * before or after {@link #onMeasure(int, int)}. 11204 * 11205 * @see #onDetachedFromWindow() 11206 */ 11207 protected void onAttachedToWindow() { 11208 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11209 mParent.requestTransparentRegion(this); 11210 } 11211 11212 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11213 initialAwakenScrollBars(); 11214 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11215 } 11216 11217 jumpDrawablesToCurrentState(); 11218 11219 // Order is important here: LayoutDirection MUST be resolved before Padding 11220 // and TextDirection 11221 resolveLayoutDirection(); 11222 resolvePadding(); 11223 resolveTextDirection(); 11224 resolveTextAlignment(); 11225 11226 clearAccessibilityFocus(); 11227 if (isFocused()) { 11228 InputMethodManager imm = InputMethodManager.peekInstance(); 11229 imm.focusIn(this); 11230 } 11231 11232 if (mAttachInfo != null && mDisplayList != null) { 11233 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11234 } 11235 } 11236 11237 /** 11238 * @see #onScreenStateChanged(int) 11239 */ 11240 void dispatchScreenStateChanged(int screenState) { 11241 onScreenStateChanged(screenState); 11242 } 11243 11244 /** 11245 * This method is called whenever the state of the screen this view is 11246 * attached to changes. A state change will usually occurs when the screen 11247 * turns on or off (whether it happens automatically or the user does it 11248 * manually.) 11249 * 11250 * @param screenState The new state of the screen. Can be either 11251 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11252 */ 11253 public void onScreenStateChanged(int screenState) { 11254 } 11255 11256 /** 11257 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11258 */ 11259 private boolean hasRtlSupport() { 11260 return mContext.getApplicationInfo().hasRtlSupport(); 11261 } 11262 11263 /** 11264 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11265 * that the parent directionality can and will be resolved before its children. 11266 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11267 */ 11268 public void resolveLayoutDirection() { 11269 // Clear any previous layout direction resolution 11270 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11271 11272 if (hasRtlSupport()) { 11273 // Set resolved depending on layout direction 11274 switch (getLayoutDirection()) { 11275 case LAYOUT_DIRECTION_INHERIT: 11276 // We cannot resolve yet. LTR is by default and let the resolution happen again 11277 // later to get the correct resolved value 11278 if (!canResolveLayoutDirection()) return; 11279 11280 ViewGroup viewGroup = ((ViewGroup) mParent); 11281 11282 // We cannot resolve yet on the parent too. LTR is by default and let the 11283 // resolution happen again later 11284 if (!viewGroup.canResolveLayoutDirection()) return; 11285 11286 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11287 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11288 } 11289 break; 11290 case LAYOUT_DIRECTION_RTL: 11291 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11292 break; 11293 case LAYOUT_DIRECTION_LOCALE: 11294 if(isLayoutDirectionRtl(Locale.getDefault())) { 11295 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11296 } 11297 break; 11298 default: 11299 // Nothing to do, LTR by default 11300 } 11301 } 11302 11303 // Set to resolved 11304 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11305 onResolvedLayoutDirectionChanged(); 11306 // Resolve padding 11307 resolvePadding(); 11308 } 11309 11310 /** 11311 * Called when layout direction has been resolved. 11312 * 11313 * The default implementation does nothing. 11314 */ 11315 public void onResolvedLayoutDirectionChanged() { 11316 } 11317 11318 /** 11319 * Resolve padding depending on layout direction. 11320 */ 11321 public void resolvePadding() { 11322 // If the user specified the absolute padding (either with android:padding or 11323 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11324 // use the default padding or the padding from the background drawable 11325 // (stored at this point in mPadding*) 11326 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11327 switch (resolvedLayoutDirection) { 11328 case LAYOUT_DIRECTION_RTL: 11329 // Start user padding override Right user padding. Otherwise, if Right user 11330 // padding is not defined, use the default Right padding. If Right user padding 11331 // is defined, just use it. 11332 if (mUserPaddingStart >= 0) { 11333 mUserPaddingRight = mUserPaddingStart; 11334 } else if (mUserPaddingRight < 0) { 11335 mUserPaddingRight = mPaddingRight; 11336 } 11337 if (mUserPaddingEnd >= 0) { 11338 mUserPaddingLeft = mUserPaddingEnd; 11339 } else if (mUserPaddingLeft < 0) { 11340 mUserPaddingLeft = mPaddingLeft; 11341 } 11342 break; 11343 case LAYOUT_DIRECTION_LTR: 11344 default: 11345 // Start user padding override Left user padding. Otherwise, if Left user 11346 // padding is not defined, use the default left padding. If Left user padding 11347 // is defined, just use it. 11348 if (mUserPaddingStart >= 0) { 11349 mUserPaddingLeft = mUserPaddingStart; 11350 } else if (mUserPaddingLeft < 0) { 11351 mUserPaddingLeft = mPaddingLeft; 11352 } 11353 if (mUserPaddingEnd >= 0) { 11354 mUserPaddingRight = mUserPaddingEnd; 11355 } else if (mUserPaddingRight < 0) { 11356 mUserPaddingRight = mPaddingRight; 11357 } 11358 } 11359 11360 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11361 11362 if(isPaddingRelative()) { 11363 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11364 } else { 11365 recomputePadding(); 11366 } 11367 onPaddingChanged(resolvedLayoutDirection); 11368 } 11369 11370 /** 11371 * Resolve padding depending on the layout direction. Subclasses that care about 11372 * padding resolution should override this method. The default implementation does 11373 * nothing. 11374 * 11375 * @param layoutDirection the direction of the layout 11376 * 11377 * @see {@link #LAYOUT_DIRECTION_LTR} 11378 * @see {@link #LAYOUT_DIRECTION_RTL} 11379 */ 11380 public void onPaddingChanged(int layoutDirection) { 11381 } 11382 11383 /** 11384 * Check if layout direction resolution can be done. 11385 * 11386 * @return true if layout direction resolution can be done otherwise return false. 11387 */ 11388 public boolean canResolveLayoutDirection() { 11389 switch (getLayoutDirection()) { 11390 case LAYOUT_DIRECTION_INHERIT: 11391 return (mParent != null) && (mParent instanceof ViewGroup); 11392 default: 11393 return true; 11394 } 11395 } 11396 11397 /** 11398 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11399 * when reset is done. 11400 */ 11401 public void resetResolvedLayoutDirection() { 11402 // Reset the current resolved bits 11403 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11404 onResolvedLayoutDirectionReset(); 11405 // Reset also the text direction 11406 resetResolvedTextDirection(); 11407 } 11408 11409 /** 11410 * Called during reset of resolved layout direction. 11411 * 11412 * Subclasses need to override this method to clear cached information that depends on the 11413 * resolved layout direction, or to inform child views that inherit their layout direction. 11414 * 11415 * The default implementation does nothing. 11416 */ 11417 public void onResolvedLayoutDirectionReset() { 11418 } 11419 11420 /** 11421 * Check if a Locale uses an RTL script. 11422 * 11423 * @param locale Locale to check 11424 * @return true if the Locale uses an RTL script. 11425 */ 11426 protected static boolean isLayoutDirectionRtl(Locale locale) { 11427 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11428 } 11429 11430 /** 11431 * This is called when the view is detached from a window. At this point it 11432 * no longer has a surface for drawing. 11433 * 11434 * @see #onAttachedToWindow() 11435 */ 11436 protected void onDetachedFromWindow() { 11437 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11438 11439 removeUnsetPressCallback(); 11440 removeLongPressCallback(); 11441 removePerformClickCallback(); 11442 removeSendViewScrolledAccessibilityEventCallback(); 11443 11444 destroyDrawingCache(); 11445 11446 destroyLayer(false); 11447 11448 if (mAttachInfo != null) { 11449 if (mDisplayList != null) { 11450 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11451 } 11452 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11453 } else { 11454 // Should never happen 11455 clearDisplayList(); 11456 } 11457 11458 mCurrentAnimation = null; 11459 11460 resetResolvedLayoutDirection(); 11461 resetResolvedTextAlignment(); 11462 resetAccessibilityStateChanged(); 11463 } 11464 11465 /** 11466 * @return The number of times this view has been attached to a window 11467 */ 11468 protected int getWindowAttachCount() { 11469 return mWindowAttachCount; 11470 } 11471 11472 /** 11473 * Retrieve a unique token identifying the window this view is attached to. 11474 * @return Return the window's token for use in 11475 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11476 */ 11477 public IBinder getWindowToken() { 11478 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11479 } 11480 11481 /** 11482 * Retrieve a unique token identifying the top-level "real" window of 11483 * the window that this view is attached to. That is, this is like 11484 * {@link #getWindowToken}, except if the window this view in is a panel 11485 * window (attached to another containing window), then the token of 11486 * the containing window is returned instead. 11487 * 11488 * @return Returns the associated window token, either 11489 * {@link #getWindowToken()} or the containing window's token. 11490 */ 11491 public IBinder getApplicationWindowToken() { 11492 AttachInfo ai = mAttachInfo; 11493 if (ai != null) { 11494 IBinder appWindowToken = ai.mPanelParentWindowToken; 11495 if (appWindowToken == null) { 11496 appWindowToken = ai.mWindowToken; 11497 } 11498 return appWindowToken; 11499 } 11500 return null; 11501 } 11502 11503 /** 11504 * Retrieve private session object this view hierarchy is using to 11505 * communicate with the window manager. 11506 * @return the session object to communicate with the window manager 11507 */ 11508 /*package*/ IWindowSession getWindowSession() { 11509 return mAttachInfo != null ? mAttachInfo.mSession : null; 11510 } 11511 11512 /** 11513 * @param info the {@link android.view.View.AttachInfo} to associated with 11514 * this view 11515 */ 11516 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11517 //System.out.println("Attached! " + this); 11518 mAttachInfo = info; 11519 mWindowAttachCount++; 11520 // We will need to evaluate the drawable state at least once. 11521 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11522 if (mFloatingTreeObserver != null) { 11523 info.mTreeObserver.merge(mFloatingTreeObserver); 11524 mFloatingTreeObserver = null; 11525 } 11526 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11527 mAttachInfo.mScrollContainers.add(this); 11528 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11529 } 11530 performCollectViewAttributes(mAttachInfo, visibility); 11531 onAttachedToWindow(); 11532 11533 ListenerInfo li = mListenerInfo; 11534 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11535 li != null ? li.mOnAttachStateChangeListeners : null; 11536 if (listeners != null && listeners.size() > 0) { 11537 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11538 // perform the dispatching. The iterator is a safe guard against listeners that 11539 // could mutate the list by calling the various add/remove methods. This prevents 11540 // the array from being modified while we iterate it. 11541 for (OnAttachStateChangeListener listener : listeners) { 11542 listener.onViewAttachedToWindow(this); 11543 } 11544 } 11545 11546 int vis = info.mWindowVisibility; 11547 if (vis != GONE) { 11548 onWindowVisibilityChanged(vis); 11549 } 11550 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11551 // If nobody has evaluated the drawable state yet, then do it now. 11552 refreshDrawableState(); 11553 } 11554 } 11555 11556 void dispatchDetachedFromWindow() { 11557 AttachInfo info = mAttachInfo; 11558 if (info != null) { 11559 int vis = info.mWindowVisibility; 11560 if (vis != GONE) { 11561 onWindowVisibilityChanged(GONE); 11562 } 11563 } 11564 11565 onDetachedFromWindow(); 11566 11567 ListenerInfo li = mListenerInfo; 11568 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11569 li != null ? li.mOnAttachStateChangeListeners : null; 11570 if (listeners != null && listeners.size() > 0) { 11571 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11572 // perform the dispatching. The iterator is a safe guard against listeners that 11573 // could mutate the list by calling the various add/remove methods. This prevents 11574 // the array from being modified while we iterate it. 11575 for (OnAttachStateChangeListener listener : listeners) { 11576 listener.onViewDetachedFromWindow(this); 11577 } 11578 } 11579 11580 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11581 mAttachInfo.mScrollContainers.remove(this); 11582 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11583 } 11584 11585 mAttachInfo = null; 11586 } 11587 11588 /** 11589 * Store this view hierarchy's frozen state into the given container. 11590 * 11591 * @param container The SparseArray in which to save the view's state. 11592 * 11593 * @see #restoreHierarchyState(android.util.SparseArray) 11594 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11595 * @see #onSaveInstanceState() 11596 */ 11597 public void saveHierarchyState(SparseArray<Parcelable> container) { 11598 dispatchSaveInstanceState(container); 11599 } 11600 11601 /** 11602 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11603 * this view and its children. May be overridden to modify how freezing happens to a 11604 * view's children; for example, some views may want to not store state for their children. 11605 * 11606 * @param container The SparseArray in which to save the view's state. 11607 * 11608 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11609 * @see #saveHierarchyState(android.util.SparseArray) 11610 * @see #onSaveInstanceState() 11611 */ 11612 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11613 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11614 mPrivateFlags &= ~SAVE_STATE_CALLED; 11615 Parcelable state = onSaveInstanceState(); 11616 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11617 throw new IllegalStateException( 11618 "Derived class did not call super.onSaveInstanceState()"); 11619 } 11620 if (state != null) { 11621 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11622 // + ": " + state); 11623 container.put(mID, state); 11624 } 11625 } 11626 } 11627 11628 /** 11629 * Hook allowing a view to generate a representation of its internal state 11630 * that can later be used to create a new instance with that same state. 11631 * This state should only contain information that is not persistent or can 11632 * not be reconstructed later. For example, you will never store your 11633 * current position on screen because that will be computed again when a 11634 * new instance of the view is placed in its view hierarchy. 11635 * <p> 11636 * Some examples of things you may store here: the current cursor position 11637 * in a text view (but usually not the text itself since that is stored in a 11638 * content provider or other persistent storage), the currently selected 11639 * item in a list view. 11640 * 11641 * @return Returns a Parcelable object containing the view's current dynamic 11642 * state, or null if there is nothing interesting to save. The 11643 * default implementation returns null. 11644 * @see #onRestoreInstanceState(android.os.Parcelable) 11645 * @see #saveHierarchyState(android.util.SparseArray) 11646 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11647 * @see #setSaveEnabled(boolean) 11648 */ 11649 protected Parcelable onSaveInstanceState() { 11650 mPrivateFlags |= SAVE_STATE_CALLED; 11651 return BaseSavedState.EMPTY_STATE; 11652 } 11653 11654 /** 11655 * Restore this view hierarchy's frozen state from the given container. 11656 * 11657 * @param container The SparseArray which holds previously frozen states. 11658 * 11659 * @see #saveHierarchyState(android.util.SparseArray) 11660 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11661 * @see #onRestoreInstanceState(android.os.Parcelable) 11662 */ 11663 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11664 dispatchRestoreInstanceState(container); 11665 } 11666 11667 /** 11668 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11669 * state for this view and its children. May be overridden to modify how restoring 11670 * happens to a view's children; for example, some views may want to not store state 11671 * for their children. 11672 * 11673 * @param container The SparseArray which holds previously saved state. 11674 * 11675 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11676 * @see #restoreHierarchyState(android.util.SparseArray) 11677 * @see #onRestoreInstanceState(android.os.Parcelable) 11678 */ 11679 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11680 if (mID != NO_ID) { 11681 Parcelable state = container.get(mID); 11682 if (state != null) { 11683 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11684 // + ": " + state); 11685 mPrivateFlags &= ~SAVE_STATE_CALLED; 11686 onRestoreInstanceState(state); 11687 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11688 throw new IllegalStateException( 11689 "Derived class did not call super.onRestoreInstanceState()"); 11690 } 11691 } 11692 } 11693 } 11694 11695 /** 11696 * Hook allowing a view to re-apply a representation of its internal state that had previously 11697 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11698 * null state. 11699 * 11700 * @param state The frozen state that had previously been returned by 11701 * {@link #onSaveInstanceState}. 11702 * 11703 * @see #onSaveInstanceState() 11704 * @see #restoreHierarchyState(android.util.SparseArray) 11705 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11706 */ 11707 protected void onRestoreInstanceState(Parcelable state) { 11708 mPrivateFlags |= SAVE_STATE_CALLED; 11709 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11710 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11711 + "received " + state.getClass().toString() + " instead. This usually happens " 11712 + "when two views of different type have the same id in the same hierarchy. " 11713 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11714 + "other views do not use the same id."); 11715 } 11716 } 11717 11718 /** 11719 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11720 * 11721 * @return the drawing start time in milliseconds 11722 */ 11723 public long getDrawingTime() { 11724 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11725 } 11726 11727 /** 11728 * <p>Enables or disables the duplication of the parent's state into this view. When 11729 * duplication is enabled, this view gets its drawable state from its parent rather 11730 * than from its own internal properties.</p> 11731 * 11732 * <p>Note: in the current implementation, setting this property to true after the 11733 * view was added to a ViewGroup might have no effect at all. This property should 11734 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11735 * 11736 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11737 * property is enabled, an exception will be thrown.</p> 11738 * 11739 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11740 * parent, these states should not be affected by this method.</p> 11741 * 11742 * @param enabled True to enable duplication of the parent's drawable state, false 11743 * to disable it. 11744 * 11745 * @see #getDrawableState() 11746 * @see #isDuplicateParentStateEnabled() 11747 */ 11748 public void setDuplicateParentStateEnabled(boolean enabled) { 11749 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11750 } 11751 11752 /** 11753 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11754 * 11755 * @return True if this view's drawable state is duplicated from the parent, 11756 * false otherwise 11757 * 11758 * @see #getDrawableState() 11759 * @see #setDuplicateParentStateEnabled(boolean) 11760 */ 11761 public boolean isDuplicateParentStateEnabled() { 11762 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11763 } 11764 11765 /** 11766 * <p>Specifies the type of layer backing this view. The layer can be 11767 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11768 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11769 * 11770 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11771 * instance that controls how the layer is composed on screen. The following 11772 * properties of the paint are taken into account when composing the layer:</p> 11773 * <ul> 11774 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11775 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11776 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11777 * </ul> 11778 * 11779 * <p>If this view has an alpha value set to < 1.0 by calling 11780 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11781 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11782 * equivalent to setting a hardware layer on this view and providing a paint with 11783 * the desired alpha value.<p> 11784 * 11785 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11786 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11787 * for more information on when and how to use layers.</p> 11788 * 11789 * @param layerType The ype of layer to use with this view, must be one of 11790 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11791 * {@link #LAYER_TYPE_HARDWARE} 11792 * @param paint The paint used to compose the layer. This argument is optional 11793 * and can be null. It is ignored when the layer type is 11794 * {@link #LAYER_TYPE_NONE} 11795 * 11796 * @see #getLayerType() 11797 * @see #LAYER_TYPE_NONE 11798 * @see #LAYER_TYPE_SOFTWARE 11799 * @see #LAYER_TYPE_HARDWARE 11800 * @see #setAlpha(float) 11801 * 11802 * @attr ref android.R.styleable#View_layerType 11803 */ 11804 public void setLayerType(int layerType, Paint paint) { 11805 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11806 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11807 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11808 } 11809 11810 if (layerType == mLayerType) { 11811 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11812 mLayerPaint = paint == null ? new Paint() : paint; 11813 invalidateParentCaches(); 11814 invalidate(true); 11815 } 11816 return; 11817 } 11818 11819 // Destroy any previous software drawing cache if needed 11820 switch (mLayerType) { 11821 case LAYER_TYPE_HARDWARE: 11822 destroyLayer(false); 11823 // fall through - non-accelerated views may use software layer mechanism instead 11824 case LAYER_TYPE_SOFTWARE: 11825 destroyDrawingCache(); 11826 break; 11827 default: 11828 break; 11829 } 11830 11831 mLayerType = layerType; 11832 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11833 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11834 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11835 11836 invalidateParentCaches(); 11837 invalidate(true); 11838 } 11839 11840 /** 11841 * Indicates whether this view has a static layer. A view with layer type 11842 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11843 * dynamic. 11844 */ 11845 boolean hasStaticLayer() { 11846 return true; 11847 } 11848 11849 /** 11850 * Indicates what type of layer is currently associated with this view. By default 11851 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11852 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11853 * for more information on the different types of layers. 11854 * 11855 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11856 * {@link #LAYER_TYPE_HARDWARE} 11857 * 11858 * @see #setLayerType(int, android.graphics.Paint) 11859 * @see #buildLayer() 11860 * @see #LAYER_TYPE_NONE 11861 * @see #LAYER_TYPE_SOFTWARE 11862 * @see #LAYER_TYPE_HARDWARE 11863 */ 11864 public int getLayerType() { 11865 return mLayerType; 11866 } 11867 11868 /** 11869 * Forces this view's layer to be created and this view to be rendered 11870 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11871 * invoking this method will have no effect. 11872 * 11873 * This method can for instance be used to render a view into its layer before 11874 * starting an animation. If this view is complex, rendering into the layer 11875 * before starting the animation will avoid skipping frames. 11876 * 11877 * @throws IllegalStateException If this view is not attached to a window 11878 * 11879 * @see #setLayerType(int, android.graphics.Paint) 11880 */ 11881 public void buildLayer() { 11882 if (mLayerType == LAYER_TYPE_NONE) return; 11883 11884 if (mAttachInfo == null) { 11885 throw new IllegalStateException("This view must be attached to a window first"); 11886 } 11887 11888 switch (mLayerType) { 11889 case LAYER_TYPE_HARDWARE: 11890 if (mAttachInfo.mHardwareRenderer != null && 11891 mAttachInfo.mHardwareRenderer.isEnabled() && 11892 mAttachInfo.mHardwareRenderer.validate()) { 11893 getHardwareLayer(); 11894 } 11895 break; 11896 case LAYER_TYPE_SOFTWARE: 11897 buildDrawingCache(true); 11898 break; 11899 } 11900 } 11901 11902 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11903 void flushLayer() { 11904 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11905 mHardwareLayer.flush(); 11906 } 11907 } 11908 11909 /** 11910 * <p>Returns a hardware layer that can be used to draw this view again 11911 * without executing its draw method.</p> 11912 * 11913 * @return A HardwareLayer ready to render, or null if an error occurred. 11914 */ 11915 HardwareLayer getHardwareLayer() { 11916 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11917 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11918 return null; 11919 } 11920 11921 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11922 11923 final int width = mRight - mLeft; 11924 final int height = mBottom - mTop; 11925 11926 if (width == 0 || height == 0) { 11927 return null; 11928 } 11929 11930 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11931 if (mHardwareLayer == null) { 11932 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11933 width, height, isOpaque()); 11934 mLocalDirtyRect.set(0, 0, width, height); 11935 } else { 11936 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11937 mHardwareLayer.resize(width, height); 11938 mLocalDirtyRect.set(0, 0, width, height); 11939 } 11940 11941 // This should not be necessary but applications that change 11942 // the parameters of their background drawable without calling 11943 // this.setBackground(Drawable) can leave the view in a bad state 11944 // (for instance isOpaque() returns true, but the background is 11945 // not opaque.) 11946 computeOpaqueFlags(); 11947 11948 final boolean opaque = isOpaque(); 11949 if (mHardwareLayer.isOpaque() != opaque) { 11950 mHardwareLayer.setOpaque(opaque); 11951 mLocalDirtyRect.set(0, 0, width, height); 11952 } 11953 } 11954 11955 // The layer is not valid if the underlying GPU resources cannot be allocated 11956 if (!mHardwareLayer.isValid()) { 11957 return null; 11958 } 11959 11960 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11961 mLocalDirtyRect.setEmpty(); 11962 } 11963 11964 return mHardwareLayer; 11965 } 11966 11967 /** 11968 * Destroys this View's hardware layer if possible. 11969 * 11970 * @return True if the layer was destroyed, false otherwise. 11971 * 11972 * @see #setLayerType(int, android.graphics.Paint) 11973 * @see #LAYER_TYPE_HARDWARE 11974 */ 11975 boolean destroyLayer(boolean valid) { 11976 if (mHardwareLayer != null) { 11977 AttachInfo info = mAttachInfo; 11978 if (info != null && info.mHardwareRenderer != null && 11979 info.mHardwareRenderer.isEnabled() && 11980 (valid || info.mHardwareRenderer.validate())) { 11981 mHardwareLayer.destroy(); 11982 mHardwareLayer = null; 11983 11984 invalidate(true); 11985 invalidateParentCaches(); 11986 } 11987 return true; 11988 } 11989 return false; 11990 } 11991 11992 /** 11993 * Destroys all hardware rendering resources. This method is invoked 11994 * when the system needs to reclaim resources. Upon execution of this 11995 * method, you should free any OpenGL resources created by the view. 11996 * 11997 * Note: you <strong>must</strong> call 11998 * <code>super.destroyHardwareResources()</code> when overriding 11999 * this method. 12000 * 12001 * @hide 12002 */ 12003 protected void destroyHardwareResources() { 12004 destroyLayer(true); 12005 } 12006 12007 /** 12008 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12009 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12010 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12011 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12012 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12013 * null.</p> 12014 * 12015 * <p>Enabling the drawing cache is similar to 12016 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12017 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12018 * drawing cache has no effect on rendering because the system uses a different mechanism 12019 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12020 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12021 * for information on how to enable software and hardware layers.</p> 12022 * 12023 * <p>This API can be used to manually generate 12024 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12025 * {@link #getDrawingCache()}.</p> 12026 * 12027 * @param enabled true to enable the drawing cache, false otherwise 12028 * 12029 * @see #isDrawingCacheEnabled() 12030 * @see #getDrawingCache() 12031 * @see #buildDrawingCache() 12032 * @see #setLayerType(int, android.graphics.Paint) 12033 */ 12034 public void setDrawingCacheEnabled(boolean enabled) { 12035 mCachingFailed = false; 12036 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12037 } 12038 12039 /** 12040 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12041 * 12042 * @return true if the drawing cache is enabled 12043 * 12044 * @see #setDrawingCacheEnabled(boolean) 12045 * @see #getDrawingCache() 12046 */ 12047 @ViewDebug.ExportedProperty(category = "drawing") 12048 public boolean isDrawingCacheEnabled() { 12049 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12050 } 12051 12052 /** 12053 * Debugging utility which recursively outputs the dirty state of a view and its 12054 * descendants. 12055 * 12056 * @hide 12057 */ 12058 @SuppressWarnings({"UnusedDeclaration"}) 12059 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12060 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12061 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12062 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12063 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12064 if (clear) { 12065 mPrivateFlags &= clearMask; 12066 } 12067 if (this instanceof ViewGroup) { 12068 ViewGroup parent = (ViewGroup) this; 12069 final int count = parent.getChildCount(); 12070 for (int i = 0; i < count; i++) { 12071 final View child = parent.getChildAt(i); 12072 child.outputDirtyFlags(indent + " ", clear, clearMask); 12073 } 12074 } 12075 } 12076 12077 /** 12078 * This method is used by ViewGroup to cause its children to restore or recreate their 12079 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12080 * to recreate its own display list, which would happen if it went through the normal 12081 * draw/dispatchDraw mechanisms. 12082 * 12083 * @hide 12084 */ 12085 protected void dispatchGetDisplayList() {} 12086 12087 /** 12088 * A view that is not attached or hardware accelerated cannot create a display list. 12089 * This method checks these conditions and returns the appropriate result. 12090 * 12091 * @return true if view has the ability to create a display list, false otherwise. 12092 * 12093 * @hide 12094 */ 12095 public boolean canHaveDisplayList() { 12096 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12097 } 12098 12099 /** 12100 * @return The HardwareRenderer associated with that view or null if hardware rendering 12101 * is not supported or this this has not been attached to a window. 12102 * 12103 * @hide 12104 */ 12105 public HardwareRenderer getHardwareRenderer() { 12106 if (mAttachInfo != null) { 12107 return mAttachInfo.mHardwareRenderer; 12108 } 12109 return null; 12110 } 12111 12112 /** 12113 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12114 * Otherwise, the same display list will be returned (after having been rendered into 12115 * along the way, depending on the invalidation state of the view). 12116 * 12117 * @param displayList The previous version of this displayList, could be null. 12118 * @param isLayer Whether the requester of the display list is a layer. If so, 12119 * the view will avoid creating a layer inside the resulting display list. 12120 * @return A new or reused DisplayList object. 12121 */ 12122 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12123 if (!canHaveDisplayList()) { 12124 return null; 12125 } 12126 12127 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12128 displayList == null || !displayList.isValid() || 12129 (!isLayer && mRecreateDisplayList))) { 12130 // Don't need to recreate the display list, just need to tell our 12131 // children to restore/recreate theirs 12132 if (displayList != null && displayList.isValid() && 12133 !isLayer && !mRecreateDisplayList) { 12134 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12135 mPrivateFlags &= ~DIRTY_MASK; 12136 dispatchGetDisplayList(); 12137 12138 return displayList; 12139 } 12140 12141 if (!isLayer) { 12142 // If we got here, we're recreating it. Mark it as such to ensure that 12143 // we copy in child display lists into ours in drawChild() 12144 mRecreateDisplayList = true; 12145 } 12146 if (displayList == null) { 12147 final String name = getClass().getSimpleName(); 12148 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12149 // If we're creating a new display list, make sure our parent gets invalidated 12150 // since they will need to recreate their display list to account for this 12151 // new child display list. 12152 invalidateParentCaches(); 12153 } 12154 12155 boolean caching = false; 12156 final HardwareCanvas canvas = displayList.start(); 12157 int width = mRight - mLeft; 12158 int height = mBottom - mTop; 12159 12160 try { 12161 canvas.setViewport(width, height); 12162 // The dirty rect should always be null for a display list 12163 canvas.onPreDraw(null); 12164 int layerType = getLayerType(); 12165 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12166 if (layerType == LAYER_TYPE_HARDWARE) { 12167 final HardwareLayer layer = getHardwareLayer(); 12168 if (layer != null && layer.isValid()) { 12169 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12170 } else { 12171 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12172 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12173 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12174 } 12175 caching = true; 12176 } else { 12177 buildDrawingCache(true); 12178 Bitmap cache = getDrawingCache(true); 12179 if (cache != null) { 12180 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12181 caching = true; 12182 } 12183 } 12184 } else { 12185 12186 computeScroll(); 12187 12188 canvas.translate(-mScrollX, -mScrollY); 12189 if (!isLayer) { 12190 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12191 mPrivateFlags &= ~DIRTY_MASK; 12192 } 12193 12194 // Fast path for layouts with no backgrounds 12195 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12196 dispatchDraw(canvas); 12197 } else { 12198 draw(canvas); 12199 } 12200 } 12201 } finally { 12202 canvas.onPostDraw(); 12203 12204 displayList.end(); 12205 displayList.setCaching(caching); 12206 if (isLayer) { 12207 displayList.setLeftTopRightBottom(0, 0, width, height); 12208 } else { 12209 setDisplayListProperties(displayList); 12210 } 12211 } 12212 } else if (!isLayer) { 12213 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12214 mPrivateFlags &= ~DIRTY_MASK; 12215 } 12216 12217 return displayList; 12218 } 12219 12220 /** 12221 * Get the DisplayList for the HardwareLayer 12222 * 12223 * @param layer The HardwareLayer whose DisplayList we want 12224 * @return A DisplayList fopr the specified HardwareLayer 12225 */ 12226 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12227 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12228 layer.setDisplayList(displayList); 12229 return displayList; 12230 } 12231 12232 12233 /** 12234 * <p>Returns a display list that can be used to draw this view again 12235 * without executing its draw method.</p> 12236 * 12237 * @return A DisplayList ready to replay, or null if caching is not enabled. 12238 * 12239 * @hide 12240 */ 12241 public DisplayList getDisplayList() { 12242 mDisplayList = getDisplayList(mDisplayList, false); 12243 return mDisplayList; 12244 } 12245 12246 private void clearDisplayList() { 12247 if (mDisplayList != null) { 12248 mDisplayList.invalidate(); 12249 mDisplayList.clear(); 12250 } 12251 } 12252 12253 /** 12254 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12255 * 12256 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12257 * 12258 * @see #getDrawingCache(boolean) 12259 */ 12260 public Bitmap getDrawingCache() { 12261 return getDrawingCache(false); 12262 } 12263 12264 /** 12265 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12266 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12267 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12268 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12269 * request the drawing cache by calling this method and draw it on screen if the 12270 * returned bitmap is not null.</p> 12271 * 12272 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12273 * this method will create a bitmap of the same size as this view. Because this bitmap 12274 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12275 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12276 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12277 * size than the view. This implies that your application must be able to handle this 12278 * size.</p> 12279 * 12280 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12281 * the current density of the screen when the application is in compatibility 12282 * mode. 12283 * 12284 * @return A bitmap representing this view or null if cache is disabled. 12285 * 12286 * @see #setDrawingCacheEnabled(boolean) 12287 * @see #isDrawingCacheEnabled() 12288 * @see #buildDrawingCache(boolean) 12289 * @see #destroyDrawingCache() 12290 */ 12291 public Bitmap getDrawingCache(boolean autoScale) { 12292 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12293 return null; 12294 } 12295 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12296 buildDrawingCache(autoScale); 12297 } 12298 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12299 } 12300 12301 /** 12302 * <p>Frees the resources used by the drawing cache. If you call 12303 * {@link #buildDrawingCache()} manually without calling 12304 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12305 * should cleanup the cache with this method afterwards.</p> 12306 * 12307 * @see #setDrawingCacheEnabled(boolean) 12308 * @see #buildDrawingCache() 12309 * @see #getDrawingCache() 12310 */ 12311 public void destroyDrawingCache() { 12312 if (mDrawingCache != null) { 12313 mDrawingCache.recycle(); 12314 mDrawingCache = null; 12315 } 12316 if (mUnscaledDrawingCache != null) { 12317 mUnscaledDrawingCache.recycle(); 12318 mUnscaledDrawingCache = null; 12319 } 12320 } 12321 12322 /** 12323 * Setting a solid background color for the drawing cache's bitmaps will improve 12324 * performance and memory usage. Note, though that this should only be used if this 12325 * view will always be drawn on top of a solid color. 12326 * 12327 * @param color The background color to use for the drawing cache's bitmap 12328 * 12329 * @see #setDrawingCacheEnabled(boolean) 12330 * @see #buildDrawingCache() 12331 * @see #getDrawingCache() 12332 */ 12333 public void setDrawingCacheBackgroundColor(int color) { 12334 if (color != mDrawingCacheBackgroundColor) { 12335 mDrawingCacheBackgroundColor = color; 12336 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12337 } 12338 } 12339 12340 /** 12341 * @see #setDrawingCacheBackgroundColor(int) 12342 * 12343 * @return The background color to used for the drawing cache's bitmap 12344 */ 12345 public int getDrawingCacheBackgroundColor() { 12346 return mDrawingCacheBackgroundColor; 12347 } 12348 12349 /** 12350 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12351 * 12352 * @see #buildDrawingCache(boolean) 12353 */ 12354 public void buildDrawingCache() { 12355 buildDrawingCache(false); 12356 } 12357 12358 /** 12359 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12360 * 12361 * <p>If you call {@link #buildDrawingCache()} manually without calling 12362 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12363 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12364 * 12365 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12366 * this method will create a bitmap of the same size as this view. Because this bitmap 12367 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12368 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12369 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12370 * size than the view. This implies that your application must be able to handle this 12371 * size.</p> 12372 * 12373 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12374 * you do not need the drawing cache bitmap, calling this method will increase memory 12375 * usage and cause the view to be rendered in software once, thus negatively impacting 12376 * performance.</p> 12377 * 12378 * @see #getDrawingCache() 12379 * @see #destroyDrawingCache() 12380 */ 12381 public void buildDrawingCache(boolean autoScale) { 12382 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12383 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12384 mCachingFailed = false; 12385 12386 int width = mRight - mLeft; 12387 int height = mBottom - mTop; 12388 12389 final AttachInfo attachInfo = mAttachInfo; 12390 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12391 12392 if (autoScale && scalingRequired) { 12393 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12394 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12395 } 12396 12397 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12398 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12399 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12400 12401 if (width <= 0 || height <= 0 || 12402 // Projected bitmap size in bytes 12403 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12404 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12405 destroyDrawingCache(); 12406 mCachingFailed = true; 12407 return; 12408 } 12409 12410 boolean clear = true; 12411 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12412 12413 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12414 Bitmap.Config quality; 12415 if (!opaque) { 12416 // Never pick ARGB_4444 because it looks awful 12417 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12418 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12419 case DRAWING_CACHE_QUALITY_AUTO: 12420 quality = Bitmap.Config.ARGB_8888; 12421 break; 12422 case DRAWING_CACHE_QUALITY_LOW: 12423 quality = Bitmap.Config.ARGB_8888; 12424 break; 12425 case DRAWING_CACHE_QUALITY_HIGH: 12426 quality = Bitmap.Config.ARGB_8888; 12427 break; 12428 default: 12429 quality = Bitmap.Config.ARGB_8888; 12430 break; 12431 } 12432 } else { 12433 // Optimization for translucent windows 12434 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12435 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12436 } 12437 12438 // Try to cleanup memory 12439 if (bitmap != null) bitmap.recycle(); 12440 12441 try { 12442 bitmap = Bitmap.createBitmap(width, height, quality); 12443 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12444 if (autoScale) { 12445 mDrawingCache = bitmap; 12446 } else { 12447 mUnscaledDrawingCache = bitmap; 12448 } 12449 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12450 } catch (OutOfMemoryError e) { 12451 // If there is not enough memory to create the bitmap cache, just 12452 // ignore the issue as bitmap caches are not required to draw the 12453 // view hierarchy 12454 if (autoScale) { 12455 mDrawingCache = null; 12456 } else { 12457 mUnscaledDrawingCache = null; 12458 } 12459 mCachingFailed = true; 12460 return; 12461 } 12462 12463 clear = drawingCacheBackgroundColor != 0; 12464 } 12465 12466 Canvas canvas; 12467 if (attachInfo != null) { 12468 canvas = attachInfo.mCanvas; 12469 if (canvas == null) { 12470 canvas = new Canvas(); 12471 } 12472 canvas.setBitmap(bitmap); 12473 // Temporarily clobber the cached Canvas in case one of our children 12474 // is also using a drawing cache. Without this, the children would 12475 // steal the canvas by attaching their own bitmap to it and bad, bad 12476 // thing would happen (invisible views, corrupted drawings, etc.) 12477 attachInfo.mCanvas = null; 12478 } else { 12479 // This case should hopefully never or seldom happen 12480 canvas = new Canvas(bitmap); 12481 } 12482 12483 if (clear) { 12484 bitmap.eraseColor(drawingCacheBackgroundColor); 12485 } 12486 12487 computeScroll(); 12488 final int restoreCount = canvas.save(); 12489 12490 if (autoScale && scalingRequired) { 12491 final float scale = attachInfo.mApplicationScale; 12492 canvas.scale(scale, scale); 12493 } 12494 12495 canvas.translate(-mScrollX, -mScrollY); 12496 12497 mPrivateFlags |= DRAWN; 12498 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12499 mLayerType != LAYER_TYPE_NONE) { 12500 mPrivateFlags |= DRAWING_CACHE_VALID; 12501 } 12502 12503 // Fast path for layouts with no backgrounds 12504 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12505 mPrivateFlags &= ~DIRTY_MASK; 12506 dispatchDraw(canvas); 12507 } else { 12508 draw(canvas); 12509 } 12510 12511 canvas.restoreToCount(restoreCount); 12512 canvas.setBitmap(null); 12513 12514 if (attachInfo != null) { 12515 // Restore the cached Canvas for our siblings 12516 attachInfo.mCanvas = canvas; 12517 } 12518 } 12519 } 12520 12521 /** 12522 * Create a snapshot of the view into a bitmap. We should probably make 12523 * some form of this public, but should think about the API. 12524 */ 12525 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12526 int width = mRight - mLeft; 12527 int height = mBottom - mTop; 12528 12529 final AttachInfo attachInfo = mAttachInfo; 12530 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12531 width = (int) ((width * scale) + 0.5f); 12532 height = (int) ((height * scale) + 0.5f); 12533 12534 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12535 if (bitmap == null) { 12536 throw new OutOfMemoryError(); 12537 } 12538 12539 Resources resources = getResources(); 12540 if (resources != null) { 12541 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12542 } 12543 12544 Canvas canvas; 12545 if (attachInfo != null) { 12546 canvas = attachInfo.mCanvas; 12547 if (canvas == null) { 12548 canvas = new Canvas(); 12549 } 12550 canvas.setBitmap(bitmap); 12551 // Temporarily clobber the cached Canvas in case one of our children 12552 // is also using a drawing cache. Without this, the children would 12553 // steal the canvas by attaching their own bitmap to it and bad, bad 12554 // things would happen (invisible views, corrupted drawings, etc.) 12555 attachInfo.mCanvas = null; 12556 } else { 12557 // This case should hopefully never or seldom happen 12558 canvas = new Canvas(bitmap); 12559 } 12560 12561 if ((backgroundColor & 0xff000000) != 0) { 12562 bitmap.eraseColor(backgroundColor); 12563 } 12564 12565 computeScroll(); 12566 final int restoreCount = canvas.save(); 12567 canvas.scale(scale, scale); 12568 canvas.translate(-mScrollX, -mScrollY); 12569 12570 // Temporarily remove the dirty mask 12571 int flags = mPrivateFlags; 12572 mPrivateFlags &= ~DIRTY_MASK; 12573 12574 // Fast path for layouts with no backgrounds 12575 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12576 dispatchDraw(canvas); 12577 } else { 12578 draw(canvas); 12579 } 12580 12581 mPrivateFlags = flags; 12582 12583 canvas.restoreToCount(restoreCount); 12584 canvas.setBitmap(null); 12585 12586 if (attachInfo != null) { 12587 // Restore the cached Canvas for our siblings 12588 attachInfo.mCanvas = canvas; 12589 } 12590 12591 return bitmap; 12592 } 12593 12594 /** 12595 * Indicates whether this View is currently in edit mode. A View is usually 12596 * in edit mode when displayed within a developer tool. For instance, if 12597 * this View is being drawn by a visual user interface builder, this method 12598 * should return true. 12599 * 12600 * Subclasses should check the return value of this method to provide 12601 * different behaviors if their normal behavior might interfere with the 12602 * host environment. For instance: the class spawns a thread in its 12603 * constructor, the drawing code relies on device-specific features, etc. 12604 * 12605 * This method is usually checked in the drawing code of custom widgets. 12606 * 12607 * @return True if this View is in edit mode, false otherwise. 12608 */ 12609 public boolean isInEditMode() { 12610 return false; 12611 } 12612 12613 /** 12614 * If the View draws content inside its padding and enables fading edges, 12615 * it needs to support padding offsets. Padding offsets are added to the 12616 * fading edges to extend the length of the fade so that it covers pixels 12617 * drawn inside the padding. 12618 * 12619 * Subclasses of this class should override this method if they need 12620 * to draw content inside the padding. 12621 * 12622 * @return True if padding offset must be applied, false otherwise. 12623 * 12624 * @see #getLeftPaddingOffset() 12625 * @see #getRightPaddingOffset() 12626 * @see #getTopPaddingOffset() 12627 * @see #getBottomPaddingOffset() 12628 * 12629 * @since CURRENT 12630 */ 12631 protected boolean isPaddingOffsetRequired() { 12632 return false; 12633 } 12634 12635 /** 12636 * Amount by which to extend the left fading region. Called only when 12637 * {@link #isPaddingOffsetRequired()} returns true. 12638 * 12639 * @return The left padding offset in pixels. 12640 * 12641 * @see #isPaddingOffsetRequired() 12642 * 12643 * @since CURRENT 12644 */ 12645 protected int getLeftPaddingOffset() { 12646 return 0; 12647 } 12648 12649 /** 12650 * Amount by which to extend the right fading region. Called only when 12651 * {@link #isPaddingOffsetRequired()} returns true. 12652 * 12653 * @return The right padding offset in pixels. 12654 * 12655 * @see #isPaddingOffsetRequired() 12656 * 12657 * @since CURRENT 12658 */ 12659 protected int getRightPaddingOffset() { 12660 return 0; 12661 } 12662 12663 /** 12664 * Amount by which to extend the top fading region. Called only when 12665 * {@link #isPaddingOffsetRequired()} returns true. 12666 * 12667 * @return The top padding offset in pixels. 12668 * 12669 * @see #isPaddingOffsetRequired() 12670 * 12671 * @since CURRENT 12672 */ 12673 protected int getTopPaddingOffset() { 12674 return 0; 12675 } 12676 12677 /** 12678 * Amount by which to extend the bottom fading region. Called only when 12679 * {@link #isPaddingOffsetRequired()} returns true. 12680 * 12681 * @return The bottom padding offset in pixels. 12682 * 12683 * @see #isPaddingOffsetRequired() 12684 * 12685 * @since CURRENT 12686 */ 12687 protected int getBottomPaddingOffset() { 12688 return 0; 12689 } 12690 12691 /** 12692 * @hide 12693 * @param offsetRequired 12694 */ 12695 protected int getFadeTop(boolean offsetRequired) { 12696 int top = mPaddingTop; 12697 if (offsetRequired) top += getTopPaddingOffset(); 12698 return top; 12699 } 12700 12701 /** 12702 * @hide 12703 * @param offsetRequired 12704 */ 12705 protected int getFadeHeight(boolean offsetRequired) { 12706 int padding = mPaddingTop; 12707 if (offsetRequired) padding += getTopPaddingOffset(); 12708 return mBottom - mTop - mPaddingBottom - padding; 12709 } 12710 12711 /** 12712 * <p>Indicates whether this view is attached to a hardware accelerated 12713 * window or not.</p> 12714 * 12715 * <p>Even if this method returns true, it does not mean that every call 12716 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12717 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12718 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12719 * window is hardware accelerated, 12720 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12721 * return false, and this method will return true.</p> 12722 * 12723 * @return True if the view is attached to a window and the window is 12724 * hardware accelerated; false in any other case. 12725 */ 12726 public boolean isHardwareAccelerated() { 12727 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12728 } 12729 12730 /** 12731 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12732 * case of an active Animation being run on the view. 12733 */ 12734 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12735 Animation a, boolean scalingRequired) { 12736 Transformation invalidationTransform; 12737 final int flags = parent.mGroupFlags; 12738 final boolean initialized = a.isInitialized(); 12739 if (!initialized) { 12740 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12741 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12742 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 12743 onAnimationStart(); 12744 } 12745 12746 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12747 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12748 if (parent.mInvalidationTransformation == null) { 12749 parent.mInvalidationTransformation = new Transformation(); 12750 } 12751 invalidationTransform = parent.mInvalidationTransformation; 12752 a.getTransformation(drawingTime, invalidationTransform, 1f); 12753 } else { 12754 invalidationTransform = parent.mChildTransformation; 12755 } 12756 12757 if (more) { 12758 if (!a.willChangeBounds()) { 12759 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12760 parent.FLAG_OPTIMIZE_INVALIDATE) { 12761 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12762 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12763 // The child need to draw an animation, potentially offscreen, so 12764 // make sure we do not cancel invalidate requests 12765 parent.mPrivateFlags |= DRAW_ANIMATION; 12766 parent.invalidate(mLeft, mTop, mRight, mBottom); 12767 } 12768 } else { 12769 if (parent.mInvalidateRegion == null) { 12770 parent.mInvalidateRegion = new RectF(); 12771 } 12772 final RectF region = parent.mInvalidateRegion; 12773 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12774 invalidationTransform); 12775 12776 // The child need to draw an animation, potentially offscreen, so 12777 // make sure we do not cancel invalidate requests 12778 parent.mPrivateFlags |= DRAW_ANIMATION; 12779 12780 final int left = mLeft + (int) region.left; 12781 final int top = mTop + (int) region.top; 12782 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12783 top + (int) (region.height() + .5f)); 12784 } 12785 } 12786 return more; 12787 } 12788 12789 /** 12790 * This method is called by getDisplayList() when a display list is created or re-rendered. 12791 * It sets or resets the current value of all properties on that display list (resetting is 12792 * necessary when a display list is being re-created, because we need to make sure that 12793 * previously-set transform values 12794 */ 12795 void setDisplayListProperties(DisplayList displayList) { 12796 if (displayList != null) { 12797 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12798 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12799 if (mParent instanceof ViewGroup) { 12800 displayList.setClipChildren( 12801 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12802 } 12803 float alpha = 1; 12804 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12805 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12806 ViewGroup parentVG = (ViewGroup) mParent; 12807 final boolean hasTransform = 12808 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12809 if (hasTransform) { 12810 Transformation transform = parentVG.mChildTransformation; 12811 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12812 if (transformType != Transformation.TYPE_IDENTITY) { 12813 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12814 alpha = transform.getAlpha(); 12815 } 12816 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12817 displayList.setStaticMatrix(transform.getMatrix()); 12818 } 12819 } 12820 } 12821 } 12822 if (mTransformationInfo != null) { 12823 alpha *= mTransformationInfo.mAlpha; 12824 if (alpha < 1) { 12825 final int multipliedAlpha = (int) (255 * alpha); 12826 if (onSetAlpha(multipliedAlpha)) { 12827 alpha = 1; 12828 } 12829 } 12830 displayList.setTransformationInfo(alpha, 12831 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12832 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12833 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12834 mTransformationInfo.mScaleY); 12835 if (mTransformationInfo.mCamera == null) { 12836 mTransformationInfo.mCamera = new Camera(); 12837 mTransformationInfo.matrix3D = new Matrix(); 12838 } 12839 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12840 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12841 displayList.setPivotX(getPivotX()); 12842 displayList.setPivotY(getPivotY()); 12843 } 12844 } else if (alpha < 1) { 12845 displayList.setAlpha(alpha); 12846 } 12847 } 12848 } 12849 12850 /** 12851 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12852 * This draw() method is an implementation detail and is not intended to be overridden or 12853 * to be called from anywhere else other than ViewGroup.drawChild(). 12854 */ 12855 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12856 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12857 boolean more = false; 12858 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12859 final int flags = parent.mGroupFlags; 12860 12861 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12862 parent.mChildTransformation.clear(); 12863 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12864 } 12865 12866 Transformation transformToApply = null; 12867 boolean concatMatrix = false; 12868 12869 boolean scalingRequired = false; 12870 boolean caching; 12871 int layerType = getLayerType(); 12872 12873 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12874 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12875 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12876 caching = true; 12877 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12878 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12879 } else { 12880 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12881 } 12882 12883 final Animation a = getAnimation(); 12884 if (a != null) { 12885 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12886 concatMatrix = a.willChangeTransformationMatrix(); 12887 if (concatMatrix) { 12888 mPrivateFlags3 |= VIEW_IS_ANIMATING_TRANSFORM; 12889 } 12890 transformToApply = parent.mChildTransformation; 12891 } else { 12892 if ((mPrivateFlags3 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12893 mDisplayList != null) { 12894 // No longer animating: clear out old animation matrix 12895 mDisplayList.setAnimationMatrix(null); 12896 mPrivateFlags3 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12897 } 12898 if (!useDisplayListProperties && 12899 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12900 final boolean hasTransform = 12901 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12902 if (hasTransform) { 12903 final int transformType = parent.mChildTransformation.getTransformationType(); 12904 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12905 parent.mChildTransformation : null; 12906 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12907 } 12908 } 12909 } 12910 12911 concatMatrix |= !childHasIdentityMatrix; 12912 12913 // Sets the flag as early as possible to allow draw() implementations 12914 // to call invalidate() successfully when doing animations 12915 mPrivateFlags |= DRAWN; 12916 12917 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12918 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12919 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12920 return more; 12921 } 12922 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12923 12924 if (hardwareAccelerated) { 12925 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12926 // retain the flag's value temporarily in the mRecreateDisplayList flag 12927 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12928 mPrivateFlags &= ~INVALIDATED; 12929 } 12930 12931 computeScroll(); 12932 12933 final int sx = mScrollX; 12934 final int sy = mScrollY; 12935 12936 DisplayList displayList = null; 12937 Bitmap cache = null; 12938 boolean hasDisplayList = false; 12939 if (caching) { 12940 if (!hardwareAccelerated) { 12941 if (layerType != LAYER_TYPE_NONE) { 12942 layerType = LAYER_TYPE_SOFTWARE; 12943 buildDrawingCache(true); 12944 } 12945 cache = getDrawingCache(true); 12946 } else { 12947 switch (layerType) { 12948 case LAYER_TYPE_SOFTWARE: 12949 if (useDisplayListProperties) { 12950 hasDisplayList = canHaveDisplayList(); 12951 } else { 12952 buildDrawingCache(true); 12953 cache = getDrawingCache(true); 12954 } 12955 break; 12956 case LAYER_TYPE_HARDWARE: 12957 if (useDisplayListProperties) { 12958 hasDisplayList = canHaveDisplayList(); 12959 } 12960 break; 12961 case LAYER_TYPE_NONE: 12962 // Delay getting the display list until animation-driven alpha values are 12963 // set up and possibly passed on to the view 12964 hasDisplayList = canHaveDisplayList(); 12965 break; 12966 } 12967 } 12968 } 12969 useDisplayListProperties &= hasDisplayList; 12970 if (useDisplayListProperties) { 12971 displayList = getDisplayList(); 12972 if (!displayList.isValid()) { 12973 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12974 // to getDisplayList(), the display list will be marked invalid and we should not 12975 // try to use it again. 12976 displayList = null; 12977 hasDisplayList = false; 12978 useDisplayListProperties = false; 12979 } 12980 } 12981 12982 final boolean hasNoCache = cache == null || hasDisplayList; 12983 final boolean offsetForScroll = cache == null && !hasDisplayList && 12984 layerType != LAYER_TYPE_HARDWARE; 12985 12986 int restoreTo = -1; 12987 if (!useDisplayListProperties || transformToApply != null) { 12988 restoreTo = canvas.save(); 12989 } 12990 if (offsetForScroll) { 12991 canvas.translate(mLeft - sx, mTop - sy); 12992 } else { 12993 if (!useDisplayListProperties) { 12994 canvas.translate(mLeft, mTop); 12995 } 12996 if (scalingRequired) { 12997 if (useDisplayListProperties) { 12998 // TODO: Might not need this if we put everything inside the DL 12999 restoreTo = canvas.save(); 13000 } 13001 // mAttachInfo cannot be null, otherwise scalingRequired == false 13002 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13003 canvas.scale(scale, scale); 13004 } 13005 } 13006 13007 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13008 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13009 (mPrivateFlags3 & VIEW_IS_ANIMATING_ALPHA) == VIEW_IS_ANIMATING_ALPHA) { 13010 if (transformToApply != null || !childHasIdentityMatrix) { 13011 int transX = 0; 13012 int transY = 0; 13013 13014 if (offsetForScroll) { 13015 transX = -sx; 13016 transY = -sy; 13017 } 13018 13019 if (transformToApply != null) { 13020 if (concatMatrix) { 13021 if (useDisplayListProperties) { 13022 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13023 } else { 13024 // Undo the scroll translation, apply the transformation matrix, 13025 // then redo the scroll translate to get the correct result. 13026 canvas.translate(-transX, -transY); 13027 canvas.concat(transformToApply.getMatrix()); 13028 canvas.translate(transX, transY); 13029 } 13030 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13031 } 13032 13033 float transformAlpha = transformToApply.getAlpha(); 13034 if (transformAlpha < 1) { 13035 alpha *= transformAlpha; 13036 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13037 } 13038 } 13039 13040 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13041 canvas.translate(-transX, -transY); 13042 canvas.concat(getMatrix()); 13043 canvas.translate(transX, transY); 13044 } 13045 } 13046 13047 // Deal with alpha if it is or used to be <1 13048 if (alpha < 1 || 13049 (mPrivateFlags3 & VIEW_IS_ANIMATING_ALPHA) == VIEW_IS_ANIMATING_ALPHA) { 13050 if (alpha < 1) { 13051 mPrivateFlags3 |= VIEW_IS_ANIMATING_ALPHA; 13052 } else { 13053 mPrivateFlags3 &= ~VIEW_IS_ANIMATING_ALPHA; 13054 } 13055 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13056 if (hasNoCache) { 13057 final int multipliedAlpha = (int) (255 * alpha); 13058 if (!onSetAlpha(multipliedAlpha)) { 13059 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13060 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13061 layerType != LAYER_TYPE_NONE) { 13062 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13063 } 13064 if (useDisplayListProperties) { 13065 displayList.setAlpha(alpha * getAlpha()); 13066 } else if (layerType == LAYER_TYPE_NONE) { 13067 final int scrollX = hasDisplayList ? 0 : sx; 13068 final int scrollY = hasDisplayList ? 0 : sy; 13069 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13070 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13071 } 13072 } else { 13073 // Alpha is handled by the child directly, clobber the layer's alpha 13074 mPrivateFlags |= ALPHA_SET; 13075 } 13076 } 13077 } 13078 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13079 onSetAlpha(255); 13080 mPrivateFlags &= ~ALPHA_SET; 13081 } 13082 13083 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13084 !useDisplayListProperties) { 13085 if (offsetForScroll) { 13086 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13087 } else { 13088 if (!scalingRequired || cache == null) { 13089 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13090 } else { 13091 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13092 } 13093 } 13094 } 13095 13096 if (!useDisplayListProperties && hasDisplayList) { 13097 displayList = getDisplayList(); 13098 if (!displayList.isValid()) { 13099 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13100 // to getDisplayList(), the display list will be marked invalid and we should not 13101 // try to use it again. 13102 displayList = null; 13103 hasDisplayList = false; 13104 } 13105 } 13106 13107 if (hasNoCache) { 13108 boolean layerRendered = false; 13109 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13110 final HardwareLayer layer = getHardwareLayer(); 13111 if (layer != null && layer.isValid()) { 13112 mLayerPaint.setAlpha((int) (alpha * 255)); 13113 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13114 layerRendered = true; 13115 } else { 13116 final int scrollX = hasDisplayList ? 0 : sx; 13117 final int scrollY = hasDisplayList ? 0 : sy; 13118 canvas.saveLayer(scrollX, scrollY, 13119 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13120 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13121 } 13122 } 13123 13124 if (!layerRendered) { 13125 if (!hasDisplayList) { 13126 // Fast path for layouts with no backgrounds 13127 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13128 mPrivateFlags &= ~DIRTY_MASK; 13129 dispatchDraw(canvas); 13130 } else { 13131 draw(canvas); 13132 } 13133 } else { 13134 mPrivateFlags &= ~DIRTY_MASK; 13135 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13136 } 13137 } 13138 } else if (cache != null) { 13139 mPrivateFlags &= ~DIRTY_MASK; 13140 Paint cachePaint; 13141 13142 if (layerType == LAYER_TYPE_NONE) { 13143 cachePaint = parent.mCachePaint; 13144 if (cachePaint == null) { 13145 cachePaint = new Paint(); 13146 cachePaint.setDither(false); 13147 parent.mCachePaint = cachePaint; 13148 } 13149 if (alpha < 1) { 13150 cachePaint.setAlpha((int) (alpha * 255)); 13151 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13152 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13153 cachePaint.setAlpha(255); 13154 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13155 } 13156 } else { 13157 cachePaint = mLayerPaint; 13158 cachePaint.setAlpha((int) (alpha * 255)); 13159 } 13160 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13161 } 13162 13163 if (restoreTo >= 0) { 13164 canvas.restoreToCount(restoreTo); 13165 } 13166 13167 if (a != null && !more) { 13168 if (!hardwareAccelerated && !a.getFillAfter()) { 13169 onSetAlpha(255); 13170 } 13171 parent.finishAnimatingView(this, a); 13172 } 13173 13174 if (more && hardwareAccelerated) { 13175 // invalidation is the trigger to recreate display lists, so if we're using 13176 // display lists to render, force an invalidate to allow the animation to 13177 // continue drawing another frame 13178 parent.invalidate(true); 13179 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13180 // alpha animations should cause the child to recreate its display list 13181 invalidate(true); 13182 } 13183 } 13184 13185 mRecreateDisplayList = false; 13186 13187 return more; 13188 } 13189 13190 /** 13191 * Manually render this view (and all of its children) to the given Canvas. 13192 * The view must have already done a full layout before this function is 13193 * called. When implementing a view, implement 13194 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13195 * If you do need to override this method, call the superclass version. 13196 * 13197 * @param canvas The Canvas to which the View is rendered. 13198 */ 13199 public void draw(Canvas canvas) { 13200 final int privateFlags = mPrivateFlags; 13201 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13202 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13203 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13204 13205 /* 13206 * Draw traversal performs several drawing steps which must be executed 13207 * in the appropriate order: 13208 * 13209 * 1. Draw the background 13210 * 2. If necessary, save the canvas' layers to prepare for fading 13211 * 3. Draw view's content 13212 * 4. Draw children 13213 * 5. If necessary, draw the fading edges and restore layers 13214 * 6. Draw decorations (scrollbars for instance) 13215 */ 13216 13217 // Step 1, draw the background, if needed 13218 int saveCount; 13219 13220 if (!dirtyOpaque) { 13221 final Drawable background = mBackground; 13222 if (background != null) { 13223 final int scrollX = mScrollX; 13224 final int scrollY = mScrollY; 13225 13226 if (mBackgroundSizeChanged) { 13227 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13228 mBackgroundSizeChanged = false; 13229 } 13230 13231 if ((scrollX | scrollY) == 0) { 13232 background.draw(canvas); 13233 } else { 13234 canvas.translate(scrollX, scrollY); 13235 background.draw(canvas); 13236 canvas.translate(-scrollX, -scrollY); 13237 } 13238 } 13239 } 13240 13241 // skip step 2 & 5 if possible (common case) 13242 final int viewFlags = mViewFlags; 13243 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13244 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13245 if (!verticalEdges && !horizontalEdges) { 13246 // Step 3, draw the content 13247 if (!dirtyOpaque) onDraw(canvas); 13248 13249 // Step 4, draw the children 13250 dispatchDraw(canvas); 13251 13252 // Step 6, draw decorations (scrollbars) 13253 onDrawScrollBars(canvas); 13254 13255 // we're done... 13256 return; 13257 } 13258 13259 /* 13260 * Here we do the full fledged routine... 13261 * (this is an uncommon case where speed matters less, 13262 * this is why we repeat some of the tests that have been 13263 * done above) 13264 */ 13265 13266 boolean drawTop = false; 13267 boolean drawBottom = false; 13268 boolean drawLeft = false; 13269 boolean drawRight = false; 13270 13271 float topFadeStrength = 0.0f; 13272 float bottomFadeStrength = 0.0f; 13273 float leftFadeStrength = 0.0f; 13274 float rightFadeStrength = 0.0f; 13275 13276 // Step 2, save the canvas' layers 13277 int paddingLeft = mPaddingLeft; 13278 13279 final boolean offsetRequired = isPaddingOffsetRequired(); 13280 if (offsetRequired) { 13281 paddingLeft += getLeftPaddingOffset(); 13282 } 13283 13284 int left = mScrollX + paddingLeft; 13285 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13286 int top = mScrollY + getFadeTop(offsetRequired); 13287 int bottom = top + getFadeHeight(offsetRequired); 13288 13289 if (offsetRequired) { 13290 right += getRightPaddingOffset(); 13291 bottom += getBottomPaddingOffset(); 13292 } 13293 13294 final ScrollabilityCache scrollabilityCache = mScrollCache; 13295 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13296 int length = (int) fadeHeight; 13297 13298 // clip the fade length if top and bottom fades overlap 13299 // overlapping fades produce odd-looking artifacts 13300 if (verticalEdges && (top + length > bottom - length)) { 13301 length = (bottom - top) / 2; 13302 } 13303 13304 // also clip horizontal fades if necessary 13305 if (horizontalEdges && (left + length > right - length)) { 13306 length = (right - left) / 2; 13307 } 13308 13309 if (verticalEdges) { 13310 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13311 drawTop = topFadeStrength * fadeHeight > 1.0f; 13312 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13313 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13314 } 13315 13316 if (horizontalEdges) { 13317 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13318 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13319 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13320 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13321 } 13322 13323 saveCount = canvas.getSaveCount(); 13324 13325 int solidColor = getSolidColor(); 13326 if (solidColor == 0) { 13327 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13328 13329 if (drawTop) { 13330 canvas.saveLayer(left, top, right, top + length, null, flags); 13331 } 13332 13333 if (drawBottom) { 13334 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13335 } 13336 13337 if (drawLeft) { 13338 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13339 } 13340 13341 if (drawRight) { 13342 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13343 } 13344 } else { 13345 scrollabilityCache.setFadeColor(solidColor); 13346 } 13347 13348 // Step 3, draw the content 13349 if (!dirtyOpaque) onDraw(canvas); 13350 13351 // Step 4, draw the children 13352 dispatchDraw(canvas); 13353 13354 // Step 5, draw the fade effect and restore layers 13355 final Paint p = scrollabilityCache.paint; 13356 final Matrix matrix = scrollabilityCache.matrix; 13357 final Shader fade = scrollabilityCache.shader; 13358 13359 if (drawTop) { 13360 matrix.setScale(1, fadeHeight * topFadeStrength); 13361 matrix.postTranslate(left, top); 13362 fade.setLocalMatrix(matrix); 13363 canvas.drawRect(left, top, right, top + length, p); 13364 } 13365 13366 if (drawBottom) { 13367 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13368 matrix.postRotate(180); 13369 matrix.postTranslate(left, bottom); 13370 fade.setLocalMatrix(matrix); 13371 canvas.drawRect(left, bottom - length, right, bottom, p); 13372 } 13373 13374 if (drawLeft) { 13375 matrix.setScale(1, fadeHeight * leftFadeStrength); 13376 matrix.postRotate(-90); 13377 matrix.postTranslate(left, top); 13378 fade.setLocalMatrix(matrix); 13379 canvas.drawRect(left, top, left + length, bottom, p); 13380 } 13381 13382 if (drawRight) { 13383 matrix.setScale(1, fadeHeight * rightFadeStrength); 13384 matrix.postRotate(90); 13385 matrix.postTranslate(right, top); 13386 fade.setLocalMatrix(matrix); 13387 canvas.drawRect(right - length, top, right, bottom, p); 13388 } 13389 13390 canvas.restoreToCount(saveCount); 13391 13392 // Step 6, draw decorations (scrollbars) 13393 onDrawScrollBars(canvas); 13394 } 13395 13396 /** 13397 * Override this if your view is known to always be drawn on top of a solid color background, 13398 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13399 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13400 * should be set to 0xFF. 13401 * 13402 * @see #setVerticalFadingEdgeEnabled(boolean) 13403 * @see #setHorizontalFadingEdgeEnabled(boolean) 13404 * 13405 * @return The known solid color background for this view, or 0 if the color may vary 13406 */ 13407 @ViewDebug.ExportedProperty(category = "drawing") 13408 public int getSolidColor() { 13409 return 0; 13410 } 13411 13412 /** 13413 * Build a human readable string representation of the specified view flags. 13414 * 13415 * @param flags the view flags to convert to a string 13416 * @return a String representing the supplied flags 13417 */ 13418 private static String printFlags(int flags) { 13419 String output = ""; 13420 int numFlags = 0; 13421 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13422 output += "TAKES_FOCUS"; 13423 numFlags++; 13424 } 13425 13426 switch (flags & VISIBILITY_MASK) { 13427 case INVISIBLE: 13428 if (numFlags > 0) { 13429 output += " "; 13430 } 13431 output += "INVISIBLE"; 13432 // USELESS HERE numFlags++; 13433 break; 13434 case GONE: 13435 if (numFlags > 0) { 13436 output += " "; 13437 } 13438 output += "GONE"; 13439 // USELESS HERE numFlags++; 13440 break; 13441 default: 13442 break; 13443 } 13444 return output; 13445 } 13446 13447 /** 13448 * Build a human readable string representation of the specified private 13449 * view flags. 13450 * 13451 * @param privateFlags the private view flags to convert to a string 13452 * @return a String representing the supplied flags 13453 */ 13454 private static String printPrivateFlags(int privateFlags) { 13455 String output = ""; 13456 int numFlags = 0; 13457 13458 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13459 output += "WANTS_FOCUS"; 13460 numFlags++; 13461 } 13462 13463 if ((privateFlags & FOCUSED) == FOCUSED) { 13464 if (numFlags > 0) { 13465 output += " "; 13466 } 13467 output += "FOCUSED"; 13468 numFlags++; 13469 } 13470 13471 if ((privateFlags & SELECTED) == SELECTED) { 13472 if (numFlags > 0) { 13473 output += " "; 13474 } 13475 output += "SELECTED"; 13476 numFlags++; 13477 } 13478 13479 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13480 if (numFlags > 0) { 13481 output += " "; 13482 } 13483 output += "IS_ROOT_NAMESPACE"; 13484 numFlags++; 13485 } 13486 13487 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13488 if (numFlags > 0) { 13489 output += " "; 13490 } 13491 output += "HAS_BOUNDS"; 13492 numFlags++; 13493 } 13494 13495 if ((privateFlags & DRAWN) == DRAWN) { 13496 if (numFlags > 0) { 13497 output += " "; 13498 } 13499 output += "DRAWN"; 13500 // USELESS HERE numFlags++; 13501 } 13502 return output; 13503 } 13504 13505 /** 13506 * <p>Indicates whether or not this view's layout will be requested during 13507 * the next hierarchy layout pass.</p> 13508 * 13509 * @return true if the layout will be forced during next layout pass 13510 */ 13511 public boolean isLayoutRequested() { 13512 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13513 } 13514 13515 /** 13516 * Assign a size and position to a view and all of its 13517 * descendants 13518 * 13519 * <p>This is the second phase of the layout mechanism. 13520 * (The first is measuring). In this phase, each parent calls 13521 * layout on all of its children to position them. 13522 * This is typically done using the child measurements 13523 * that were stored in the measure pass().</p> 13524 * 13525 * <p>Derived classes should not override this method. 13526 * Derived classes with children should override 13527 * onLayout. In that method, they should 13528 * call layout on each of their children.</p> 13529 * 13530 * @param l Left position, relative to parent 13531 * @param t Top position, relative to parent 13532 * @param r Right position, relative to parent 13533 * @param b Bottom position, relative to parent 13534 */ 13535 @SuppressWarnings({"unchecked"}) 13536 public void layout(int l, int t, int r, int b) { 13537 int oldL = mLeft; 13538 int oldT = mTop; 13539 int oldB = mBottom; 13540 int oldR = mRight; 13541 boolean changed = setFrame(l, t, r, b); 13542 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13543 onLayout(changed, l, t, r, b); 13544 mPrivateFlags &= ~LAYOUT_REQUIRED; 13545 13546 ListenerInfo li = mListenerInfo; 13547 if (li != null && li.mOnLayoutChangeListeners != null) { 13548 ArrayList<OnLayoutChangeListener> listenersCopy = 13549 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13550 int numListeners = listenersCopy.size(); 13551 for (int i = 0; i < numListeners; ++i) { 13552 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13553 } 13554 } 13555 } 13556 mPrivateFlags &= ~FORCE_LAYOUT; 13557 } 13558 13559 /** 13560 * Called from layout when this view should 13561 * assign a size and position to each of its children. 13562 * 13563 * Derived classes with children should override 13564 * this method and call layout on each of 13565 * their children. 13566 * @param changed This is a new size or position for this view 13567 * @param left Left position, relative to parent 13568 * @param top Top position, relative to parent 13569 * @param right Right position, relative to parent 13570 * @param bottom Bottom position, relative to parent 13571 */ 13572 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13573 } 13574 13575 /** 13576 * Assign a size and position to this view. 13577 * 13578 * This is called from layout. 13579 * 13580 * @param left Left position, relative to parent 13581 * @param top Top position, relative to parent 13582 * @param right Right position, relative to parent 13583 * @param bottom Bottom position, relative to parent 13584 * @return true if the new size and position are different than the 13585 * previous ones 13586 * {@hide} 13587 */ 13588 protected boolean setFrame(int left, int top, int right, int bottom) { 13589 boolean changed = false; 13590 13591 if (DBG) { 13592 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13593 + right + "," + bottom + ")"); 13594 } 13595 13596 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13597 changed = true; 13598 13599 // Remember our drawn bit 13600 int drawn = mPrivateFlags & DRAWN; 13601 13602 int oldWidth = mRight - mLeft; 13603 int oldHeight = mBottom - mTop; 13604 int newWidth = right - left; 13605 int newHeight = bottom - top; 13606 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13607 13608 // Invalidate our old position 13609 invalidate(sizeChanged); 13610 13611 mLeft = left; 13612 mTop = top; 13613 mRight = right; 13614 mBottom = bottom; 13615 if (mDisplayList != null) { 13616 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13617 } 13618 13619 mPrivateFlags |= HAS_BOUNDS; 13620 13621 13622 if (sizeChanged) { 13623 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13624 // A change in dimension means an auto-centered pivot point changes, too 13625 if (mTransformationInfo != null) { 13626 mTransformationInfo.mMatrixDirty = true; 13627 } 13628 } 13629 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13630 } 13631 13632 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13633 // If we are visible, force the DRAWN bit to on so that 13634 // this invalidate will go through (at least to our parent). 13635 // This is because someone may have invalidated this view 13636 // before this call to setFrame came in, thereby clearing 13637 // the DRAWN bit. 13638 mPrivateFlags |= DRAWN; 13639 invalidate(sizeChanged); 13640 // parent display list may need to be recreated based on a change in the bounds 13641 // of any child 13642 invalidateParentCaches(); 13643 } 13644 13645 // Reset drawn bit to original value (invalidate turns it off) 13646 mPrivateFlags |= drawn; 13647 13648 mBackgroundSizeChanged = true; 13649 } 13650 return changed; 13651 } 13652 13653 /** 13654 * Finalize inflating a view from XML. This is called as the last phase 13655 * of inflation, after all child views have been added. 13656 * 13657 * <p>Even if the subclass overrides onFinishInflate, they should always be 13658 * sure to call the super method, so that we get called. 13659 */ 13660 protected void onFinishInflate() { 13661 } 13662 13663 /** 13664 * Returns the resources associated with this view. 13665 * 13666 * @return Resources object. 13667 */ 13668 public Resources getResources() { 13669 return mResources; 13670 } 13671 13672 /** 13673 * Invalidates the specified Drawable. 13674 * 13675 * @param drawable the drawable to invalidate 13676 */ 13677 public void invalidateDrawable(Drawable drawable) { 13678 if (verifyDrawable(drawable)) { 13679 final Rect dirty = drawable.getBounds(); 13680 final int scrollX = mScrollX; 13681 final int scrollY = mScrollY; 13682 13683 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13684 dirty.right + scrollX, dirty.bottom + scrollY); 13685 } 13686 } 13687 13688 /** 13689 * Schedules an action on a drawable to occur at a specified time. 13690 * 13691 * @param who the recipient of the action 13692 * @param what the action to run on the drawable 13693 * @param when the time at which the action must occur. Uses the 13694 * {@link SystemClock#uptimeMillis} timebase. 13695 */ 13696 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13697 if (verifyDrawable(who) && what != null) { 13698 final long delay = when - SystemClock.uptimeMillis(); 13699 if (mAttachInfo != null) { 13700 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13701 Choreographer.CALLBACK_ANIMATION, what, who, 13702 Choreographer.subtractFrameDelay(delay)); 13703 } else { 13704 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13705 } 13706 } 13707 } 13708 13709 /** 13710 * Cancels a scheduled action on a drawable. 13711 * 13712 * @param who the recipient of the action 13713 * @param what the action to cancel 13714 */ 13715 public void unscheduleDrawable(Drawable who, Runnable what) { 13716 if (verifyDrawable(who) && what != null) { 13717 if (mAttachInfo != null) { 13718 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13719 Choreographer.CALLBACK_ANIMATION, what, who); 13720 } else { 13721 ViewRootImpl.getRunQueue().removeCallbacks(what); 13722 } 13723 } 13724 } 13725 13726 /** 13727 * Unschedule any events associated with the given Drawable. This can be 13728 * used when selecting a new Drawable into a view, so that the previous 13729 * one is completely unscheduled. 13730 * 13731 * @param who The Drawable to unschedule. 13732 * 13733 * @see #drawableStateChanged 13734 */ 13735 public void unscheduleDrawable(Drawable who) { 13736 if (mAttachInfo != null && who != null) { 13737 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13738 Choreographer.CALLBACK_ANIMATION, null, who); 13739 } 13740 } 13741 13742 /** 13743 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 13744 * that the View directionality can and will be resolved before its Drawables. 13745 * 13746 * Will call {@link View#onResolveDrawables} when resolution is done. 13747 */ 13748 public void resolveDrawables() { 13749 if (mBackground != null) { 13750 mBackground.setLayoutDirection(getResolvedLayoutDirection()); 13751 } 13752 onResolveDrawables(getResolvedLayoutDirection()); 13753 } 13754 13755 /** 13756 * Called when layout direction has been resolved. 13757 * 13758 * The default implementation does nothing. 13759 * 13760 * @param layoutDirection The resolved layout direction. 13761 * 13762 * @see {@link #LAYOUT_DIRECTION_LTR} 13763 * @see {@link #LAYOUT_DIRECTION_RTL} 13764 */ 13765 public void onResolveDrawables(int layoutDirection) { 13766 } 13767 13768 /** 13769 * If your view subclass is displaying its own Drawable objects, it should 13770 * override this function and return true for any Drawable it is 13771 * displaying. This allows animations for those drawables to be 13772 * scheduled. 13773 * 13774 * <p>Be sure to call through to the super class when overriding this 13775 * function. 13776 * 13777 * @param who The Drawable to verify. Return true if it is one you are 13778 * displaying, else return the result of calling through to the 13779 * super class. 13780 * 13781 * @return boolean If true than the Drawable is being displayed in the 13782 * view; else false and it is not allowed to animate. 13783 * 13784 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13785 * @see #drawableStateChanged() 13786 */ 13787 protected boolean verifyDrawable(Drawable who) { 13788 return who == mBackground; 13789 } 13790 13791 /** 13792 * This function is called whenever the state of the view changes in such 13793 * a way that it impacts the state of drawables being shown. 13794 * 13795 * <p>Be sure to call through to the superclass when overriding this 13796 * function. 13797 * 13798 * @see Drawable#setState(int[]) 13799 */ 13800 protected void drawableStateChanged() { 13801 Drawable d = mBackground; 13802 if (d != null && d.isStateful()) { 13803 d.setState(getDrawableState()); 13804 } 13805 } 13806 13807 /** 13808 * Call this to force a view to update its drawable state. This will cause 13809 * drawableStateChanged to be called on this view. Views that are interested 13810 * in the new state should call getDrawableState. 13811 * 13812 * @see #drawableStateChanged 13813 * @see #getDrawableState 13814 */ 13815 public void refreshDrawableState() { 13816 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13817 drawableStateChanged(); 13818 13819 ViewParent parent = mParent; 13820 if (parent != null) { 13821 parent.childDrawableStateChanged(this); 13822 } 13823 } 13824 13825 /** 13826 * Return an array of resource IDs of the drawable states representing the 13827 * current state of the view. 13828 * 13829 * @return The current drawable state 13830 * 13831 * @see Drawable#setState(int[]) 13832 * @see #drawableStateChanged() 13833 * @see #onCreateDrawableState(int) 13834 */ 13835 public final int[] getDrawableState() { 13836 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13837 return mDrawableState; 13838 } else { 13839 mDrawableState = onCreateDrawableState(0); 13840 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13841 return mDrawableState; 13842 } 13843 } 13844 13845 /** 13846 * Generate the new {@link android.graphics.drawable.Drawable} state for 13847 * this view. This is called by the view 13848 * system when the cached Drawable state is determined to be invalid. To 13849 * retrieve the current state, you should use {@link #getDrawableState}. 13850 * 13851 * @param extraSpace if non-zero, this is the number of extra entries you 13852 * would like in the returned array in which you can place your own 13853 * states. 13854 * 13855 * @return Returns an array holding the current {@link Drawable} state of 13856 * the view. 13857 * 13858 * @see #mergeDrawableStates(int[], int[]) 13859 */ 13860 protected int[] onCreateDrawableState(int extraSpace) { 13861 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13862 mParent instanceof View) { 13863 return ((View) mParent).onCreateDrawableState(extraSpace); 13864 } 13865 13866 int[] drawableState; 13867 13868 int privateFlags = mPrivateFlags; 13869 13870 int viewStateIndex = 0; 13871 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13872 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13873 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13874 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13875 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13876 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13877 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13878 HardwareRenderer.isAvailable()) { 13879 // This is set if HW acceleration is requested, even if the current 13880 // process doesn't allow it. This is just to allow app preview 13881 // windows to better match their app. 13882 viewStateIndex |= VIEW_STATE_ACCELERATED; 13883 } 13884 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13885 13886 final int privateFlags2 = mPrivateFlags2; 13887 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13888 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13889 13890 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13891 13892 //noinspection ConstantIfStatement 13893 if (false) { 13894 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13895 Log.i("View", toString() 13896 + " pressed=" + ((privateFlags & PRESSED) != 0) 13897 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13898 + " fo=" + hasFocus() 13899 + " sl=" + ((privateFlags & SELECTED) != 0) 13900 + " wf=" + hasWindowFocus() 13901 + ": " + Arrays.toString(drawableState)); 13902 } 13903 13904 if (extraSpace == 0) { 13905 return drawableState; 13906 } 13907 13908 final int[] fullState; 13909 if (drawableState != null) { 13910 fullState = new int[drawableState.length + extraSpace]; 13911 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13912 } else { 13913 fullState = new int[extraSpace]; 13914 } 13915 13916 return fullState; 13917 } 13918 13919 /** 13920 * Merge your own state values in <var>additionalState</var> into the base 13921 * state values <var>baseState</var> that were returned by 13922 * {@link #onCreateDrawableState(int)}. 13923 * 13924 * @param baseState The base state values returned by 13925 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13926 * own additional state values. 13927 * 13928 * @param additionalState The additional state values you would like 13929 * added to <var>baseState</var>; this array is not modified. 13930 * 13931 * @return As a convenience, the <var>baseState</var> array you originally 13932 * passed into the function is returned. 13933 * 13934 * @see #onCreateDrawableState(int) 13935 */ 13936 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13937 final int N = baseState.length; 13938 int i = N - 1; 13939 while (i >= 0 && baseState[i] == 0) { 13940 i--; 13941 } 13942 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13943 return baseState; 13944 } 13945 13946 /** 13947 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13948 * on all Drawable objects associated with this view. 13949 */ 13950 public void jumpDrawablesToCurrentState() { 13951 if (mBackground != null) { 13952 mBackground.jumpToCurrentState(); 13953 } 13954 } 13955 13956 /** 13957 * Sets the background color for this view. 13958 * @param color the color of the background 13959 */ 13960 @RemotableViewMethod 13961 public void setBackgroundColor(int color) { 13962 if (mBackground instanceof ColorDrawable) { 13963 ((ColorDrawable) mBackground).setColor(color); 13964 computeOpaqueFlags(); 13965 } else { 13966 setBackground(new ColorDrawable(color)); 13967 } 13968 } 13969 13970 /** 13971 * Set the background to a given resource. The resource should refer to 13972 * a Drawable object or 0 to remove the background. 13973 * @param resid The identifier of the resource. 13974 * 13975 * @attr ref android.R.styleable#View_background 13976 */ 13977 @RemotableViewMethod 13978 public void setBackgroundResource(int resid) { 13979 if (resid != 0 && resid == mBackgroundResource) { 13980 return; 13981 } 13982 13983 Drawable d= null; 13984 if (resid != 0) { 13985 d = mResources.getDrawable(resid); 13986 } 13987 setBackground(d); 13988 13989 mBackgroundResource = resid; 13990 } 13991 13992 /** 13993 * Set the background to a given Drawable, or remove the background. If the 13994 * background has padding, this View's padding is set to the background's 13995 * padding. However, when a background is removed, this View's padding isn't 13996 * touched. If setting the padding is desired, please use 13997 * {@link #setPadding(int, int, int, int)}. 13998 * 13999 * @param background The Drawable to use as the background, or null to remove the 14000 * background 14001 */ 14002 public void setBackground(Drawable background) { 14003 //noinspection deprecation 14004 setBackgroundDrawable(background); 14005 } 14006 14007 /** 14008 * @deprecated use {@link #setBackground(Drawable)} instead 14009 */ 14010 @Deprecated 14011 public void setBackgroundDrawable(Drawable background) { 14012 computeOpaqueFlags(); 14013 14014 if (background == mBackground) { 14015 return; 14016 } 14017 14018 boolean requestLayout = false; 14019 14020 mBackgroundResource = 0; 14021 14022 /* 14023 * Regardless of whether we're setting a new background or not, we want 14024 * to clear the previous drawable. 14025 */ 14026 if (mBackground != null) { 14027 mBackground.setCallback(null); 14028 unscheduleDrawable(mBackground); 14029 } 14030 14031 if (background != null) { 14032 Rect padding = sThreadLocal.get(); 14033 if (padding == null) { 14034 padding = new Rect(); 14035 sThreadLocal.set(padding); 14036 } 14037 background.setLayoutDirection(getResolvedLayoutDirection()); 14038 if (background.getPadding(padding)) { 14039 switch (background.getLayoutDirection()) { 14040 case LAYOUT_DIRECTION_RTL: 14041 setPadding(padding.right, padding.top, padding.left, padding.bottom); 14042 break; 14043 case LAYOUT_DIRECTION_LTR: 14044 default: 14045 setPadding(padding.left, padding.top, padding.right, padding.bottom); 14046 } 14047 } 14048 14049 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14050 // if it has a different minimum size, we should layout again 14051 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14052 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14053 requestLayout = true; 14054 } 14055 14056 background.setCallback(this); 14057 if (background.isStateful()) { 14058 background.setState(getDrawableState()); 14059 } 14060 background.setVisible(getVisibility() == VISIBLE, false); 14061 mBackground = background; 14062 14063 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14064 mPrivateFlags &= ~SKIP_DRAW; 14065 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14066 requestLayout = true; 14067 } 14068 } else { 14069 /* Remove the background */ 14070 mBackground = null; 14071 14072 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14073 /* 14074 * This view ONLY drew the background before and we're removing 14075 * the background, so now it won't draw anything 14076 * (hence we SKIP_DRAW) 14077 */ 14078 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14079 mPrivateFlags |= SKIP_DRAW; 14080 } 14081 14082 /* 14083 * When the background is set, we try to apply its padding to this 14084 * View. When the background is removed, we don't touch this View's 14085 * padding. This is noted in the Javadocs. Hence, we don't need to 14086 * requestLayout(), the invalidate() below is sufficient. 14087 */ 14088 14089 // The old background's minimum size could have affected this 14090 // View's layout, so let's requestLayout 14091 requestLayout = true; 14092 } 14093 14094 computeOpaqueFlags(); 14095 14096 if (requestLayout) { 14097 requestLayout(); 14098 } 14099 14100 mBackgroundSizeChanged = true; 14101 invalidate(true); 14102 } 14103 14104 /** 14105 * Gets the background drawable 14106 * 14107 * @return The drawable used as the background for this view, if any. 14108 * 14109 * @see #setBackground(Drawable) 14110 * 14111 * @attr ref android.R.styleable#View_background 14112 */ 14113 public Drawable getBackground() { 14114 return mBackground; 14115 } 14116 14117 /** 14118 * Sets the padding. The view may add on the space required to display 14119 * the scrollbars, depending on the style and visibility of the scrollbars. 14120 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14121 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14122 * from the values set in this call. 14123 * 14124 * @attr ref android.R.styleable#View_padding 14125 * @attr ref android.R.styleable#View_paddingBottom 14126 * @attr ref android.R.styleable#View_paddingLeft 14127 * @attr ref android.R.styleable#View_paddingRight 14128 * @attr ref android.R.styleable#View_paddingTop 14129 * @param left the left padding in pixels 14130 * @param top the top padding in pixels 14131 * @param right the right padding in pixels 14132 * @param bottom the bottom padding in pixels 14133 */ 14134 public void setPadding(int left, int top, int right, int bottom) { 14135 mUserPaddingStart = -1; 14136 mUserPaddingEnd = -1; 14137 mUserPaddingRelative = false; 14138 14139 internalSetPadding(left, top, right, bottom); 14140 } 14141 14142 private void internalSetPadding(int left, int top, int right, int bottom) { 14143 mUserPaddingLeft = left; 14144 mUserPaddingRight = right; 14145 mUserPaddingBottom = bottom; 14146 14147 final int viewFlags = mViewFlags; 14148 boolean changed = false; 14149 14150 // Common case is there are no scroll bars. 14151 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14152 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14153 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14154 ? 0 : getVerticalScrollbarWidth(); 14155 switch (mVerticalScrollbarPosition) { 14156 case SCROLLBAR_POSITION_DEFAULT: 14157 if (isLayoutRtl()) { 14158 left += offset; 14159 } else { 14160 right += offset; 14161 } 14162 break; 14163 case SCROLLBAR_POSITION_RIGHT: 14164 right += offset; 14165 break; 14166 case SCROLLBAR_POSITION_LEFT: 14167 left += offset; 14168 break; 14169 } 14170 } 14171 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14172 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14173 ? 0 : getHorizontalScrollbarHeight(); 14174 } 14175 } 14176 14177 if (mPaddingLeft != left) { 14178 changed = true; 14179 mPaddingLeft = left; 14180 } 14181 if (mPaddingTop != top) { 14182 changed = true; 14183 mPaddingTop = top; 14184 } 14185 if (mPaddingRight != right) { 14186 changed = true; 14187 mPaddingRight = right; 14188 } 14189 if (mPaddingBottom != bottom) { 14190 changed = true; 14191 mPaddingBottom = bottom; 14192 } 14193 14194 if (changed) { 14195 requestLayout(); 14196 } 14197 } 14198 14199 /** 14200 * Sets the relative padding. The view may add on the space required to display 14201 * the scrollbars, depending on the style and visibility of the scrollbars. 14202 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14203 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14204 * from the values set in this call. 14205 * 14206 * @attr ref android.R.styleable#View_padding 14207 * @attr ref android.R.styleable#View_paddingBottom 14208 * @attr ref android.R.styleable#View_paddingStart 14209 * @attr ref android.R.styleable#View_paddingEnd 14210 * @attr ref android.R.styleable#View_paddingTop 14211 * @param start the start padding in pixels 14212 * @param top the top padding in pixels 14213 * @param end the end padding in pixels 14214 * @param bottom the bottom padding in pixels 14215 */ 14216 public void setPaddingRelative(int start, int top, int end, int bottom) { 14217 mUserPaddingStart = start; 14218 mUserPaddingEnd = end; 14219 mUserPaddingRelative = true; 14220 14221 switch(getResolvedLayoutDirection()) { 14222 case LAYOUT_DIRECTION_RTL: 14223 internalSetPadding(end, top, start, bottom); 14224 break; 14225 case LAYOUT_DIRECTION_LTR: 14226 default: 14227 internalSetPadding(start, top, end, bottom); 14228 } 14229 } 14230 14231 /** 14232 * Returns the top padding of this view. 14233 * 14234 * @return the top padding in pixels 14235 */ 14236 public int getPaddingTop() { 14237 return mPaddingTop; 14238 } 14239 14240 /** 14241 * Returns the bottom padding of this view. If there are inset and enabled 14242 * scrollbars, this value may include the space required to display the 14243 * scrollbars as well. 14244 * 14245 * @return the bottom padding in pixels 14246 */ 14247 public int getPaddingBottom() { 14248 return mPaddingBottom; 14249 } 14250 14251 /** 14252 * Returns the left padding of this view. If there are inset and enabled 14253 * scrollbars, this value may include the space required to display the 14254 * scrollbars as well. 14255 * 14256 * @return the left padding in pixels 14257 */ 14258 public int getPaddingLeft() { 14259 return mPaddingLeft; 14260 } 14261 14262 /** 14263 * Returns the start padding of this view depending on its resolved layout direction. 14264 * If there are inset and enabled scrollbars, this value may include the space 14265 * required to display the scrollbars as well. 14266 * 14267 * @return the start padding in pixels 14268 */ 14269 public int getPaddingStart() { 14270 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14271 mPaddingRight : mPaddingLeft; 14272 } 14273 14274 /** 14275 * Returns the right padding of this view. If there are inset and enabled 14276 * scrollbars, this value may include the space required to display the 14277 * scrollbars as well. 14278 * 14279 * @return the right padding in pixels 14280 */ 14281 public int getPaddingRight() { 14282 return mPaddingRight; 14283 } 14284 14285 /** 14286 * Returns the end padding of this view depending on its resolved layout direction. 14287 * If there are inset and enabled scrollbars, this value may include the space 14288 * required to display the scrollbars as well. 14289 * 14290 * @return the end padding in pixels 14291 */ 14292 public int getPaddingEnd() { 14293 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14294 mPaddingLeft : mPaddingRight; 14295 } 14296 14297 /** 14298 * Return if the padding as been set thru relative values 14299 * {@link #setPaddingRelative(int, int, int, int)} or thru 14300 * @attr ref android.R.styleable#View_paddingStart or 14301 * @attr ref android.R.styleable#View_paddingEnd 14302 * 14303 * @return true if the padding is relative or false if it is not. 14304 */ 14305 public boolean isPaddingRelative() { 14306 return mUserPaddingRelative; 14307 } 14308 14309 /** 14310 * @hide 14311 */ 14312 public Insets getOpticalInsets() { 14313 if (mLayoutInsets == null) { 14314 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14315 } 14316 return mLayoutInsets; 14317 } 14318 14319 /** 14320 * @hide 14321 */ 14322 public void setLayoutInsets(Insets layoutInsets) { 14323 mLayoutInsets = layoutInsets; 14324 } 14325 14326 /** 14327 * Changes the selection state of this view. A view can be selected or not. 14328 * Note that selection is not the same as focus. Views are typically 14329 * selected in the context of an AdapterView like ListView or GridView; 14330 * the selected view is the view that is highlighted. 14331 * 14332 * @param selected true if the view must be selected, false otherwise 14333 */ 14334 public void setSelected(boolean selected) { 14335 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14336 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14337 if (!selected) resetPressedState(); 14338 invalidate(true); 14339 refreshDrawableState(); 14340 dispatchSetSelected(selected); 14341 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14342 notifyAccessibilityStateChanged(); 14343 } 14344 } 14345 } 14346 14347 /** 14348 * Dispatch setSelected to all of this View's children. 14349 * 14350 * @see #setSelected(boolean) 14351 * 14352 * @param selected The new selected state 14353 */ 14354 protected void dispatchSetSelected(boolean selected) { 14355 } 14356 14357 /** 14358 * Indicates the selection state of this view. 14359 * 14360 * @return true if the view is selected, false otherwise 14361 */ 14362 @ViewDebug.ExportedProperty 14363 public boolean isSelected() { 14364 return (mPrivateFlags & SELECTED) != 0; 14365 } 14366 14367 /** 14368 * Changes the activated state of this view. A view can be activated or not. 14369 * Note that activation is not the same as selection. Selection is 14370 * a transient property, representing the view (hierarchy) the user is 14371 * currently interacting with. Activation is a longer-term state that the 14372 * user can move views in and out of. For example, in a list view with 14373 * single or multiple selection enabled, the views in the current selection 14374 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14375 * here.) The activated state is propagated down to children of the view it 14376 * is set on. 14377 * 14378 * @param activated true if the view must be activated, false otherwise 14379 */ 14380 public void setActivated(boolean activated) { 14381 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14382 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14383 invalidate(true); 14384 refreshDrawableState(); 14385 dispatchSetActivated(activated); 14386 } 14387 } 14388 14389 /** 14390 * Dispatch setActivated to all of this View's children. 14391 * 14392 * @see #setActivated(boolean) 14393 * 14394 * @param activated The new activated state 14395 */ 14396 protected void dispatchSetActivated(boolean activated) { 14397 } 14398 14399 /** 14400 * Indicates the activation state of this view. 14401 * 14402 * @return true if the view is activated, false otherwise 14403 */ 14404 @ViewDebug.ExportedProperty 14405 public boolean isActivated() { 14406 return (mPrivateFlags & ACTIVATED) != 0; 14407 } 14408 14409 /** 14410 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14411 * observer can be used to get notifications when global events, like 14412 * layout, happen. 14413 * 14414 * The returned ViewTreeObserver observer is not guaranteed to remain 14415 * valid for the lifetime of this View. If the caller of this method keeps 14416 * a long-lived reference to ViewTreeObserver, it should always check for 14417 * the return value of {@link ViewTreeObserver#isAlive()}. 14418 * 14419 * @return The ViewTreeObserver for this view's hierarchy. 14420 */ 14421 public ViewTreeObserver getViewTreeObserver() { 14422 if (mAttachInfo != null) { 14423 return mAttachInfo.mTreeObserver; 14424 } 14425 if (mFloatingTreeObserver == null) { 14426 mFloatingTreeObserver = new ViewTreeObserver(); 14427 } 14428 return mFloatingTreeObserver; 14429 } 14430 14431 /** 14432 * <p>Finds the topmost view in the current view hierarchy.</p> 14433 * 14434 * @return the topmost view containing this view 14435 */ 14436 public View getRootView() { 14437 if (mAttachInfo != null) { 14438 final View v = mAttachInfo.mRootView; 14439 if (v != null) { 14440 return v; 14441 } 14442 } 14443 14444 View parent = this; 14445 14446 while (parent.mParent != null && parent.mParent instanceof View) { 14447 parent = (View) parent.mParent; 14448 } 14449 14450 return parent; 14451 } 14452 14453 /** 14454 * <p>Computes the coordinates of this view on the screen. The argument 14455 * must be an array of two integers. After the method returns, the array 14456 * contains the x and y location in that order.</p> 14457 * 14458 * @param location an array of two integers in which to hold the coordinates 14459 */ 14460 public void getLocationOnScreen(int[] location) { 14461 getLocationInWindow(location); 14462 14463 final AttachInfo info = mAttachInfo; 14464 if (info != null) { 14465 location[0] += info.mWindowLeft; 14466 location[1] += info.mWindowTop; 14467 } 14468 } 14469 14470 /** 14471 * <p>Computes the coordinates of this view in its window. The argument 14472 * must be an array of two integers. After the method returns, the array 14473 * contains the x and y location in that order.</p> 14474 * 14475 * @param location an array of two integers in which to hold the coordinates 14476 */ 14477 public void getLocationInWindow(int[] location) { 14478 if (location == null || location.length < 2) { 14479 throw new IllegalArgumentException("location must be an array of two integers"); 14480 } 14481 14482 if (mAttachInfo == null) { 14483 // When the view is not attached to a window, this method does not make sense 14484 location[0] = location[1] = 0; 14485 return; 14486 } 14487 14488 float[] position = mAttachInfo.mTmpTransformLocation; 14489 position[0] = position[1] = 0.0f; 14490 14491 if (!hasIdentityMatrix()) { 14492 getMatrix().mapPoints(position); 14493 } 14494 14495 position[0] += mLeft; 14496 position[1] += mTop; 14497 14498 ViewParent viewParent = mParent; 14499 while (viewParent instanceof View) { 14500 final View view = (View) viewParent; 14501 14502 position[0] -= view.mScrollX; 14503 position[1] -= view.mScrollY; 14504 14505 if (!view.hasIdentityMatrix()) { 14506 view.getMatrix().mapPoints(position); 14507 } 14508 14509 position[0] += view.mLeft; 14510 position[1] += view.mTop; 14511 14512 viewParent = view.mParent; 14513 } 14514 14515 if (viewParent instanceof ViewRootImpl) { 14516 // *cough* 14517 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14518 position[1] -= vr.mCurScrollY; 14519 } 14520 14521 location[0] = (int) (position[0] + 0.5f); 14522 location[1] = (int) (position[1] + 0.5f); 14523 } 14524 14525 /** 14526 * {@hide} 14527 * @param id the id of the view to be found 14528 * @return the view of the specified id, null if cannot be found 14529 */ 14530 protected View findViewTraversal(int id) { 14531 if (id == mID) { 14532 return this; 14533 } 14534 return null; 14535 } 14536 14537 /** 14538 * {@hide} 14539 * @param tag the tag of the view to be found 14540 * @return the view of specified tag, null if cannot be found 14541 */ 14542 protected View findViewWithTagTraversal(Object tag) { 14543 if (tag != null && tag.equals(mTag)) { 14544 return this; 14545 } 14546 return null; 14547 } 14548 14549 /** 14550 * {@hide} 14551 * @param predicate The predicate to evaluate. 14552 * @param childToSkip If not null, ignores this child during the recursive traversal. 14553 * @return The first view that matches the predicate or null. 14554 */ 14555 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14556 if (predicate.apply(this)) { 14557 return this; 14558 } 14559 return null; 14560 } 14561 14562 /** 14563 * Look for a child view with the given id. If this view has the given 14564 * id, return this view. 14565 * 14566 * @param id The id to search for. 14567 * @return The view that has the given id in the hierarchy or null 14568 */ 14569 public final View findViewById(int id) { 14570 if (id < 0) { 14571 return null; 14572 } 14573 return findViewTraversal(id); 14574 } 14575 14576 /** 14577 * Finds a view by its unuque and stable accessibility id. 14578 * 14579 * @param accessibilityId The searched accessibility id. 14580 * @return The found view. 14581 */ 14582 final View findViewByAccessibilityId(int accessibilityId) { 14583 if (accessibilityId < 0) { 14584 return null; 14585 } 14586 return findViewByAccessibilityIdTraversal(accessibilityId); 14587 } 14588 14589 /** 14590 * Performs the traversal to find a view by its unuque and stable accessibility id. 14591 * 14592 * <strong>Note:</strong>This method does not stop at the root namespace 14593 * boundary since the user can touch the screen at an arbitrary location 14594 * potentially crossing the root namespace bounday which will send an 14595 * accessibility event to accessibility services and they should be able 14596 * to obtain the event source. Also accessibility ids are guaranteed to be 14597 * unique in the window. 14598 * 14599 * @param accessibilityId The accessibility id. 14600 * @return The found view. 14601 */ 14602 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14603 if (getAccessibilityViewId() == accessibilityId) { 14604 return this; 14605 } 14606 return null; 14607 } 14608 14609 /** 14610 * Look for a child view with the given tag. If this view has the given 14611 * tag, return this view. 14612 * 14613 * @param tag The tag to search for, using "tag.equals(getTag())". 14614 * @return The View that has the given tag in the hierarchy or null 14615 */ 14616 public final View findViewWithTag(Object tag) { 14617 if (tag == null) { 14618 return null; 14619 } 14620 return findViewWithTagTraversal(tag); 14621 } 14622 14623 /** 14624 * {@hide} 14625 * Look for a child view that matches the specified predicate. 14626 * If this view matches the predicate, return this view. 14627 * 14628 * @param predicate The predicate to evaluate. 14629 * @return The first view that matches the predicate or null. 14630 */ 14631 public final View findViewByPredicate(Predicate<View> predicate) { 14632 return findViewByPredicateTraversal(predicate, null); 14633 } 14634 14635 /** 14636 * {@hide} 14637 * Look for a child view that matches the specified predicate, 14638 * starting with the specified view and its descendents and then 14639 * recusively searching the ancestors and siblings of that view 14640 * until this view is reached. 14641 * 14642 * This method is useful in cases where the predicate does not match 14643 * a single unique view (perhaps multiple views use the same id) 14644 * and we are trying to find the view that is "closest" in scope to the 14645 * starting view. 14646 * 14647 * @param start The view to start from. 14648 * @param predicate The predicate to evaluate. 14649 * @return The first view that matches the predicate or null. 14650 */ 14651 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14652 View childToSkip = null; 14653 for (;;) { 14654 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14655 if (view != null || start == this) { 14656 return view; 14657 } 14658 14659 ViewParent parent = start.getParent(); 14660 if (parent == null || !(parent instanceof View)) { 14661 return null; 14662 } 14663 14664 childToSkip = start; 14665 start = (View) parent; 14666 } 14667 } 14668 14669 /** 14670 * Sets the identifier for this view. The identifier does not have to be 14671 * unique in this view's hierarchy. The identifier should be a positive 14672 * number. 14673 * 14674 * @see #NO_ID 14675 * @see #getId() 14676 * @see #findViewById(int) 14677 * 14678 * @param id a number used to identify the view 14679 * 14680 * @attr ref android.R.styleable#View_id 14681 */ 14682 public void setId(int id) { 14683 mID = id; 14684 } 14685 14686 /** 14687 * {@hide} 14688 * 14689 * @param isRoot true if the view belongs to the root namespace, false 14690 * otherwise 14691 */ 14692 public void setIsRootNamespace(boolean isRoot) { 14693 if (isRoot) { 14694 mPrivateFlags |= IS_ROOT_NAMESPACE; 14695 } else { 14696 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14697 } 14698 } 14699 14700 /** 14701 * {@hide} 14702 * 14703 * @return true if the view belongs to the root namespace, false otherwise 14704 */ 14705 public boolean isRootNamespace() { 14706 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14707 } 14708 14709 /** 14710 * Returns this view's identifier. 14711 * 14712 * @return a positive integer used to identify the view or {@link #NO_ID} 14713 * if the view has no ID 14714 * 14715 * @see #setId(int) 14716 * @see #findViewById(int) 14717 * @attr ref android.R.styleable#View_id 14718 */ 14719 @ViewDebug.CapturedViewProperty 14720 public int getId() { 14721 return mID; 14722 } 14723 14724 /** 14725 * Returns this view's tag. 14726 * 14727 * @return the Object stored in this view as a tag 14728 * 14729 * @see #setTag(Object) 14730 * @see #getTag(int) 14731 */ 14732 @ViewDebug.ExportedProperty 14733 public Object getTag() { 14734 return mTag; 14735 } 14736 14737 /** 14738 * Sets the tag associated with this view. A tag can be used to mark 14739 * a view in its hierarchy and does not have to be unique within the 14740 * hierarchy. Tags can also be used to store data within a view without 14741 * resorting to another data structure. 14742 * 14743 * @param tag an Object to tag the view with 14744 * 14745 * @see #getTag() 14746 * @see #setTag(int, Object) 14747 */ 14748 public void setTag(final Object tag) { 14749 mTag = tag; 14750 } 14751 14752 /** 14753 * Returns the tag associated with this view and the specified key. 14754 * 14755 * @param key The key identifying the tag 14756 * 14757 * @return the Object stored in this view as a tag 14758 * 14759 * @see #setTag(int, Object) 14760 * @see #getTag() 14761 */ 14762 public Object getTag(int key) { 14763 if (mKeyedTags != null) return mKeyedTags.get(key); 14764 return null; 14765 } 14766 14767 /** 14768 * Sets a tag associated with this view and a key. A tag can be used 14769 * to mark a view in its hierarchy and does not have to be unique within 14770 * the hierarchy. Tags can also be used to store data within a view 14771 * without resorting to another data structure. 14772 * 14773 * The specified key should be an id declared in the resources of the 14774 * application to ensure it is unique (see the <a 14775 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14776 * Keys identified as belonging to 14777 * the Android framework or not associated with any package will cause 14778 * an {@link IllegalArgumentException} to be thrown. 14779 * 14780 * @param key The key identifying the tag 14781 * @param tag An Object to tag the view with 14782 * 14783 * @throws IllegalArgumentException If they specified key is not valid 14784 * 14785 * @see #setTag(Object) 14786 * @see #getTag(int) 14787 */ 14788 public void setTag(int key, final Object tag) { 14789 // If the package id is 0x00 or 0x01, it's either an undefined package 14790 // or a framework id 14791 if ((key >>> 24) < 2) { 14792 throw new IllegalArgumentException("The key must be an application-specific " 14793 + "resource id."); 14794 } 14795 14796 setKeyedTag(key, tag); 14797 } 14798 14799 /** 14800 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14801 * framework id. 14802 * 14803 * @hide 14804 */ 14805 public void setTagInternal(int key, Object tag) { 14806 if ((key >>> 24) != 0x1) { 14807 throw new IllegalArgumentException("The key must be a framework-specific " 14808 + "resource id."); 14809 } 14810 14811 setKeyedTag(key, tag); 14812 } 14813 14814 private void setKeyedTag(int key, Object tag) { 14815 if (mKeyedTags == null) { 14816 mKeyedTags = new SparseArray<Object>(); 14817 } 14818 14819 mKeyedTags.put(key, tag); 14820 } 14821 14822 /** 14823 * Prints information about this view in the log output, with the tag 14824 * {@link #VIEW_LOG_TAG}. 14825 * 14826 * @hide 14827 */ 14828 public void debug() { 14829 debug(0); 14830 } 14831 14832 /** 14833 * Prints information about this view in the log output, with the tag 14834 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14835 * indentation defined by the <code>depth</code>. 14836 * 14837 * @param depth the indentation level 14838 * 14839 * @hide 14840 */ 14841 protected void debug(int depth) { 14842 String output = debugIndent(depth - 1); 14843 14844 output += "+ " + this; 14845 int id = getId(); 14846 if (id != -1) { 14847 output += " (id=" + id + ")"; 14848 } 14849 Object tag = getTag(); 14850 if (tag != null) { 14851 output += " (tag=" + tag + ")"; 14852 } 14853 Log.d(VIEW_LOG_TAG, output); 14854 14855 if ((mPrivateFlags & FOCUSED) != 0) { 14856 output = debugIndent(depth) + " FOCUSED"; 14857 Log.d(VIEW_LOG_TAG, output); 14858 } 14859 14860 output = debugIndent(depth); 14861 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14862 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14863 + "} "; 14864 Log.d(VIEW_LOG_TAG, output); 14865 14866 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14867 || mPaddingBottom != 0) { 14868 output = debugIndent(depth); 14869 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14870 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14871 Log.d(VIEW_LOG_TAG, output); 14872 } 14873 14874 output = debugIndent(depth); 14875 output += "mMeasureWidth=" + mMeasuredWidth + 14876 " mMeasureHeight=" + mMeasuredHeight; 14877 Log.d(VIEW_LOG_TAG, output); 14878 14879 output = debugIndent(depth); 14880 if (mLayoutParams == null) { 14881 output += "BAD! no layout params"; 14882 } else { 14883 output = mLayoutParams.debug(output); 14884 } 14885 Log.d(VIEW_LOG_TAG, output); 14886 14887 output = debugIndent(depth); 14888 output += "flags={"; 14889 output += View.printFlags(mViewFlags); 14890 output += "}"; 14891 Log.d(VIEW_LOG_TAG, output); 14892 14893 output = debugIndent(depth); 14894 output += "privateFlags={"; 14895 output += View.printPrivateFlags(mPrivateFlags); 14896 output += "}"; 14897 Log.d(VIEW_LOG_TAG, output); 14898 } 14899 14900 /** 14901 * Creates a string of whitespaces used for indentation. 14902 * 14903 * @param depth the indentation level 14904 * @return a String containing (depth * 2 + 3) * 2 white spaces 14905 * 14906 * @hide 14907 */ 14908 protected static String debugIndent(int depth) { 14909 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14910 for (int i = 0; i < (depth * 2) + 3; i++) { 14911 spaces.append(' ').append(' '); 14912 } 14913 return spaces.toString(); 14914 } 14915 14916 /** 14917 * <p>Return the offset of the widget's text baseline from the widget's top 14918 * boundary. If this widget does not support baseline alignment, this 14919 * method returns -1. </p> 14920 * 14921 * @return the offset of the baseline within the widget's bounds or -1 14922 * if baseline alignment is not supported 14923 */ 14924 @ViewDebug.ExportedProperty(category = "layout") 14925 public int getBaseline() { 14926 return -1; 14927 } 14928 14929 /** 14930 * Call this when something has changed which has invalidated the 14931 * layout of this view. This will schedule a layout pass of the view 14932 * tree. 14933 */ 14934 public void requestLayout() { 14935 mPrivateFlags |= FORCE_LAYOUT; 14936 mPrivateFlags |= INVALIDATED; 14937 14938 if (mLayoutParams != null) { 14939 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14940 } 14941 14942 if (mParent != null && !mParent.isLayoutRequested()) { 14943 mParent.requestLayout(); 14944 } 14945 } 14946 14947 /** 14948 * Forces this view to be laid out during the next layout pass. 14949 * This method does not call requestLayout() or forceLayout() 14950 * on the parent. 14951 */ 14952 public void forceLayout() { 14953 mPrivateFlags |= FORCE_LAYOUT; 14954 mPrivateFlags |= INVALIDATED; 14955 } 14956 14957 /** 14958 * <p> 14959 * This is called to find out how big a view should be. The parent 14960 * supplies constraint information in the width and height parameters. 14961 * </p> 14962 * 14963 * <p> 14964 * The actual measurement work of a view is performed in 14965 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14966 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14967 * </p> 14968 * 14969 * 14970 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14971 * parent 14972 * @param heightMeasureSpec Vertical space requirements as imposed by the 14973 * parent 14974 * 14975 * @see #onMeasure(int, int) 14976 */ 14977 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14978 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14979 widthMeasureSpec != mOldWidthMeasureSpec || 14980 heightMeasureSpec != mOldHeightMeasureSpec) { 14981 14982 // first clears the measured dimension flag 14983 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14984 14985 // measure ourselves, this should set the measured dimension flag back 14986 onMeasure(widthMeasureSpec, heightMeasureSpec); 14987 14988 // flag not set, setMeasuredDimension() was not invoked, we raise 14989 // an exception to warn the developer 14990 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14991 throw new IllegalStateException("onMeasure() did not set the" 14992 + " measured dimension by calling" 14993 + " setMeasuredDimension()"); 14994 } 14995 14996 mPrivateFlags |= LAYOUT_REQUIRED; 14997 } 14998 14999 mOldWidthMeasureSpec = widthMeasureSpec; 15000 mOldHeightMeasureSpec = heightMeasureSpec; 15001 } 15002 15003 /** 15004 * <p> 15005 * Measure the view and its content to determine the measured width and the 15006 * measured height. This method is invoked by {@link #measure(int, int)} and 15007 * should be overriden by subclasses to provide accurate and efficient 15008 * measurement of their contents. 15009 * </p> 15010 * 15011 * <p> 15012 * <strong>CONTRACT:</strong> When overriding this method, you 15013 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15014 * measured width and height of this view. Failure to do so will trigger an 15015 * <code>IllegalStateException</code>, thrown by 15016 * {@link #measure(int, int)}. Calling the superclass' 15017 * {@link #onMeasure(int, int)} is a valid use. 15018 * </p> 15019 * 15020 * <p> 15021 * The base class implementation of measure defaults to the background size, 15022 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15023 * override {@link #onMeasure(int, int)} to provide better measurements of 15024 * their content. 15025 * </p> 15026 * 15027 * <p> 15028 * If this method is overridden, it is the subclass's responsibility to make 15029 * sure the measured height and width are at least the view's minimum height 15030 * and width ({@link #getSuggestedMinimumHeight()} and 15031 * {@link #getSuggestedMinimumWidth()}). 15032 * </p> 15033 * 15034 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15035 * The requirements are encoded with 15036 * {@link android.view.View.MeasureSpec}. 15037 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15038 * The requirements are encoded with 15039 * {@link android.view.View.MeasureSpec}. 15040 * 15041 * @see #getMeasuredWidth() 15042 * @see #getMeasuredHeight() 15043 * @see #setMeasuredDimension(int, int) 15044 * @see #getSuggestedMinimumHeight() 15045 * @see #getSuggestedMinimumWidth() 15046 * @see android.view.View.MeasureSpec#getMode(int) 15047 * @see android.view.View.MeasureSpec#getSize(int) 15048 */ 15049 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15050 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15051 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15052 } 15053 15054 /** 15055 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15056 * measured width and measured height. Failing to do so will trigger an 15057 * exception at measurement time.</p> 15058 * 15059 * @param measuredWidth The measured width of this view. May be a complex 15060 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15061 * {@link #MEASURED_STATE_TOO_SMALL}. 15062 * @param measuredHeight The measured height of this view. May be a complex 15063 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15064 * {@link #MEASURED_STATE_TOO_SMALL}. 15065 */ 15066 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15067 mMeasuredWidth = measuredWidth; 15068 mMeasuredHeight = measuredHeight; 15069 15070 mPrivateFlags |= MEASURED_DIMENSION_SET; 15071 } 15072 15073 /** 15074 * Merge two states as returned by {@link #getMeasuredState()}. 15075 * @param curState The current state as returned from a view or the result 15076 * of combining multiple views. 15077 * @param newState The new view state to combine. 15078 * @return Returns a new integer reflecting the combination of the two 15079 * states. 15080 */ 15081 public static int combineMeasuredStates(int curState, int newState) { 15082 return curState | newState; 15083 } 15084 15085 /** 15086 * Version of {@link #resolveSizeAndState(int, int, int)} 15087 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15088 */ 15089 public static int resolveSize(int size, int measureSpec) { 15090 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15091 } 15092 15093 /** 15094 * Utility to reconcile a desired size and state, with constraints imposed 15095 * by a MeasureSpec. Will take the desired size, unless a different size 15096 * is imposed by the constraints. The returned value is a compound integer, 15097 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15098 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15099 * size is smaller than the size the view wants to be. 15100 * 15101 * @param size How big the view wants to be 15102 * @param measureSpec Constraints imposed by the parent 15103 * @return Size information bit mask as defined by 15104 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15105 */ 15106 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15107 int result = size; 15108 int specMode = MeasureSpec.getMode(measureSpec); 15109 int specSize = MeasureSpec.getSize(measureSpec); 15110 switch (specMode) { 15111 case MeasureSpec.UNSPECIFIED: 15112 result = size; 15113 break; 15114 case MeasureSpec.AT_MOST: 15115 if (specSize < size) { 15116 result = specSize | MEASURED_STATE_TOO_SMALL; 15117 } else { 15118 result = size; 15119 } 15120 break; 15121 case MeasureSpec.EXACTLY: 15122 result = specSize; 15123 break; 15124 } 15125 return result | (childMeasuredState&MEASURED_STATE_MASK); 15126 } 15127 15128 /** 15129 * Utility to return a default size. Uses the supplied size if the 15130 * MeasureSpec imposed no constraints. Will get larger if allowed 15131 * by the MeasureSpec. 15132 * 15133 * @param size Default size for this view 15134 * @param measureSpec Constraints imposed by the parent 15135 * @return The size this view should be. 15136 */ 15137 public static int getDefaultSize(int size, int measureSpec) { 15138 int result = size; 15139 int specMode = MeasureSpec.getMode(measureSpec); 15140 int specSize = MeasureSpec.getSize(measureSpec); 15141 15142 switch (specMode) { 15143 case MeasureSpec.UNSPECIFIED: 15144 result = size; 15145 break; 15146 case MeasureSpec.AT_MOST: 15147 case MeasureSpec.EXACTLY: 15148 result = specSize; 15149 break; 15150 } 15151 return result; 15152 } 15153 15154 /** 15155 * Returns the suggested minimum height that the view should use. This 15156 * returns the maximum of the view's minimum height 15157 * and the background's minimum height 15158 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15159 * <p> 15160 * When being used in {@link #onMeasure(int, int)}, the caller should still 15161 * ensure the returned height is within the requirements of the parent. 15162 * 15163 * @return The suggested minimum height of the view. 15164 */ 15165 protected int getSuggestedMinimumHeight() { 15166 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15167 15168 } 15169 15170 /** 15171 * Returns the suggested minimum width that the view should use. This 15172 * returns the maximum of the view's minimum width) 15173 * and the background's minimum width 15174 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15175 * <p> 15176 * When being used in {@link #onMeasure(int, int)}, the caller should still 15177 * ensure the returned width is within the requirements of the parent. 15178 * 15179 * @return The suggested minimum width of the view. 15180 */ 15181 protected int getSuggestedMinimumWidth() { 15182 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15183 } 15184 15185 /** 15186 * Returns the minimum height of the view. 15187 * 15188 * @return the minimum height the view will try to be. 15189 * 15190 * @see #setMinimumHeight(int) 15191 * 15192 * @attr ref android.R.styleable#View_minHeight 15193 */ 15194 public int getMinimumHeight() { 15195 return mMinHeight; 15196 } 15197 15198 /** 15199 * Sets the minimum height of the view. It is not guaranteed the view will 15200 * be able to achieve this minimum height (for example, if its parent layout 15201 * constrains it with less available height). 15202 * 15203 * @param minHeight The minimum height the view will try to be. 15204 * 15205 * @see #getMinimumHeight() 15206 * 15207 * @attr ref android.R.styleable#View_minHeight 15208 */ 15209 public void setMinimumHeight(int minHeight) { 15210 mMinHeight = minHeight; 15211 requestLayout(); 15212 } 15213 15214 /** 15215 * Returns the minimum width of the view. 15216 * 15217 * @return the minimum width the view will try to be. 15218 * 15219 * @see #setMinimumWidth(int) 15220 * 15221 * @attr ref android.R.styleable#View_minWidth 15222 */ 15223 public int getMinimumWidth() { 15224 return mMinWidth; 15225 } 15226 15227 /** 15228 * Sets the minimum width of the view. It is not guaranteed the view will 15229 * be able to achieve this minimum width (for example, if its parent layout 15230 * constrains it with less available width). 15231 * 15232 * @param minWidth The minimum width the view will try to be. 15233 * 15234 * @see #getMinimumWidth() 15235 * 15236 * @attr ref android.R.styleable#View_minWidth 15237 */ 15238 public void setMinimumWidth(int minWidth) { 15239 mMinWidth = minWidth; 15240 requestLayout(); 15241 15242 } 15243 15244 /** 15245 * Get the animation currently associated with this view. 15246 * 15247 * @return The animation that is currently playing or 15248 * scheduled to play for this view. 15249 */ 15250 public Animation getAnimation() { 15251 return mCurrentAnimation; 15252 } 15253 15254 /** 15255 * Start the specified animation now. 15256 * 15257 * @param animation the animation to start now 15258 */ 15259 public void startAnimation(Animation animation) { 15260 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15261 setAnimation(animation); 15262 invalidateParentCaches(); 15263 invalidate(true); 15264 } 15265 15266 /** 15267 * Cancels any animations for this view. 15268 */ 15269 public void clearAnimation() { 15270 if (mCurrentAnimation != null) { 15271 mCurrentAnimation.detach(); 15272 } 15273 mCurrentAnimation = null; 15274 invalidateParentIfNeeded(); 15275 } 15276 15277 /** 15278 * Sets the next animation to play for this view. 15279 * If you want the animation to play immediately, use 15280 * {@link #startAnimation(android.view.animation.Animation)} instead. 15281 * This method provides allows fine-grained 15282 * control over the start time and invalidation, but you 15283 * must make sure that 1) the animation has a start time set, and 15284 * 2) the view's parent (which controls animations on its children) 15285 * will be invalidated when the animation is supposed to 15286 * start. 15287 * 15288 * @param animation The next animation, or null. 15289 */ 15290 public void setAnimation(Animation animation) { 15291 mCurrentAnimation = animation; 15292 15293 if (animation != null) { 15294 // If the screen is off assume the animation start time is now instead of 15295 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15296 // would cause the animation to start when the screen turns back on 15297 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15298 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15299 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15300 } 15301 animation.reset(); 15302 } 15303 } 15304 15305 /** 15306 * Invoked by a parent ViewGroup to notify the start of the animation 15307 * currently associated with this view. If you override this method, 15308 * always call super.onAnimationStart(); 15309 * 15310 * @see #setAnimation(android.view.animation.Animation) 15311 * @see #getAnimation() 15312 */ 15313 protected void onAnimationStart() { 15314 mPrivateFlags |= ANIMATION_STARTED; 15315 } 15316 15317 /** 15318 * Invoked by a parent ViewGroup to notify the end of the animation 15319 * currently associated with this view. If you override this method, 15320 * always call super.onAnimationEnd(); 15321 * 15322 * @see #setAnimation(android.view.animation.Animation) 15323 * @see #getAnimation() 15324 */ 15325 protected void onAnimationEnd() { 15326 mPrivateFlags &= ~ANIMATION_STARTED; 15327 } 15328 15329 /** 15330 * Invoked if there is a Transform that involves alpha. Subclass that can 15331 * draw themselves with the specified alpha should return true, and then 15332 * respect that alpha when their onDraw() is called. If this returns false 15333 * then the view may be redirected to draw into an offscreen buffer to 15334 * fulfill the request, which will look fine, but may be slower than if the 15335 * subclass handles it internally. The default implementation returns false. 15336 * 15337 * @param alpha The alpha (0..255) to apply to the view's drawing 15338 * @return true if the view can draw with the specified alpha. 15339 */ 15340 protected boolean onSetAlpha(int alpha) { 15341 return false; 15342 } 15343 15344 /** 15345 * This is used by the RootView to perform an optimization when 15346 * the view hierarchy contains one or several SurfaceView. 15347 * SurfaceView is always considered transparent, but its children are not, 15348 * therefore all View objects remove themselves from the global transparent 15349 * region (passed as a parameter to this function). 15350 * 15351 * @param region The transparent region for this ViewAncestor (window). 15352 * 15353 * @return Returns true if the effective visibility of the view at this 15354 * point is opaque, regardless of the transparent region; returns false 15355 * if it is possible for underlying windows to be seen behind the view. 15356 * 15357 * {@hide} 15358 */ 15359 public boolean gatherTransparentRegion(Region region) { 15360 final AttachInfo attachInfo = mAttachInfo; 15361 if (region != null && attachInfo != null) { 15362 final int pflags = mPrivateFlags; 15363 if ((pflags & SKIP_DRAW) == 0) { 15364 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15365 // remove it from the transparent region. 15366 final int[] location = attachInfo.mTransparentLocation; 15367 getLocationInWindow(location); 15368 region.op(location[0], location[1], location[0] + mRight - mLeft, 15369 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15370 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15371 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15372 // exists, so we remove the background drawable's non-transparent 15373 // parts from this transparent region. 15374 applyDrawableToTransparentRegion(mBackground, region); 15375 } 15376 } 15377 return true; 15378 } 15379 15380 /** 15381 * Play a sound effect for this view. 15382 * 15383 * <p>The framework will play sound effects for some built in actions, such as 15384 * clicking, but you may wish to play these effects in your widget, 15385 * for instance, for internal navigation. 15386 * 15387 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15388 * {@link #isSoundEffectsEnabled()} is true. 15389 * 15390 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15391 */ 15392 public void playSoundEffect(int soundConstant) { 15393 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15394 return; 15395 } 15396 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15397 } 15398 15399 /** 15400 * BZZZTT!!1! 15401 * 15402 * <p>Provide haptic feedback to the user for this view. 15403 * 15404 * <p>The framework will provide haptic feedback for some built in actions, 15405 * such as long presses, but you may wish to provide feedback for your 15406 * own widget. 15407 * 15408 * <p>The feedback will only be performed if 15409 * {@link #isHapticFeedbackEnabled()} is true. 15410 * 15411 * @param feedbackConstant One of the constants defined in 15412 * {@link HapticFeedbackConstants} 15413 */ 15414 public boolean performHapticFeedback(int feedbackConstant) { 15415 return performHapticFeedback(feedbackConstant, 0); 15416 } 15417 15418 /** 15419 * BZZZTT!!1! 15420 * 15421 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15422 * 15423 * @param feedbackConstant One of the constants defined in 15424 * {@link HapticFeedbackConstants} 15425 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15426 */ 15427 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15428 if (mAttachInfo == null) { 15429 return false; 15430 } 15431 //noinspection SimplifiableIfStatement 15432 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15433 && !isHapticFeedbackEnabled()) { 15434 return false; 15435 } 15436 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15437 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15438 } 15439 15440 /** 15441 * Request that the visibility of the status bar or other screen/window 15442 * decorations be changed. 15443 * 15444 * <p>This method is used to put the over device UI into temporary modes 15445 * where the user's attention is focused more on the application content, 15446 * by dimming or hiding surrounding system affordances. This is typically 15447 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15448 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15449 * to be placed behind the action bar (and with these flags other system 15450 * affordances) so that smooth transitions between hiding and showing them 15451 * can be done. 15452 * 15453 * <p>Two representative examples of the use of system UI visibility is 15454 * implementing a content browsing application (like a magazine reader) 15455 * and a video playing application. 15456 * 15457 * <p>The first code shows a typical implementation of a View in a content 15458 * browsing application. In this implementation, the application goes 15459 * into a content-oriented mode by hiding the status bar and action bar, 15460 * and putting the navigation elements into lights out mode. The user can 15461 * then interact with content while in this mode. Such an application should 15462 * provide an easy way for the user to toggle out of the mode (such as to 15463 * check information in the status bar or access notifications). In the 15464 * implementation here, this is done simply by tapping on the content. 15465 * 15466 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15467 * content} 15468 * 15469 * <p>This second code sample shows a typical implementation of a View 15470 * in a video playing application. In this situation, while the video is 15471 * playing the application would like to go into a complete full-screen mode, 15472 * to use as much of the display as possible for the video. When in this state 15473 * the user can not interact with the application; the system intercepts 15474 * touching on the screen to pop the UI out of full screen mode. See 15475 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15476 * 15477 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15478 * content} 15479 * 15480 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15481 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15482 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15483 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15484 */ 15485 public void setSystemUiVisibility(int visibility) { 15486 if (visibility != mSystemUiVisibility) { 15487 mSystemUiVisibility = visibility; 15488 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15489 mParent.recomputeViewAttributes(this); 15490 } 15491 } 15492 } 15493 15494 /** 15495 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15496 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15497 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15498 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15499 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15500 */ 15501 public int getSystemUiVisibility() { 15502 return mSystemUiVisibility; 15503 } 15504 15505 /** 15506 * Returns the current system UI visibility that is currently set for 15507 * the entire window. This is the combination of the 15508 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15509 * views in the window. 15510 */ 15511 public int getWindowSystemUiVisibility() { 15512 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15513 } 15514 15515 /** 15516 * Override to find out when the window's requested system UI visibility 15517 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15518 * This is different from the callbacks recieved through 15519 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15520 * in that this is only telling you about the local request of the window, 15521 * not the actual values applied by the system. 15522 */ 15523 public void onWindowSystemUiVisibilityChanged(int visible) { 15524 } 15525 15526 /** 15527 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15528 * the view hierarchy. 15529 */ 15530 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15531 onWindowSystemUiVisibilityChanged(visible); 15532 } 15533 15534 /** 15535 * Set a listener to receive callbacks when the visibility of the system bar changes. 15536 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15537 */ 15538 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15539 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15540 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15541 mParent.recomputeViewAttributes(this); 15542 } 15543 } 15544 15545 /** 15546 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15547 * the view hierarchy. 15548 */ 15549 public void dispatchSystemUiVisibilityChanged(int visibility) { 15550 ListenerInfo li = mListenerInfo; 15551 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15552 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15553 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15554 } 15555 } 15556 15557 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15558 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15559 if (val != mSystemUiVisibility) { 15560 setSystemUiVisibility(val); 15561 return true; 15562 } 15563 return false; 15564 } 15565 15566 /** @hide */ 15567 public void setDisabledSystemUiVisibility(int flags) { 15568 if (mAttachInfo != null) { 15569 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15570 mAttachInfo.mDisabledSystemUiVisibility = flags; 15571 if (mParent != null) { 15572 mParent.recomputeViewAttributes(this); 15573 } 15574 } 15575 } 15576 } 15577 15578 /** 15579 * Creates an image that the system displays during the drag and drop 15580 * operation. This is called a "drag shadow". The default implementation 15581 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15582 * appearance as the given View. The default also positions the center of the drag shadow 15583 * directly under the touch point. If no View is provided (the constructor with no parameters 15584 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15585 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15586 * default is an invisible drag shadow. 15587 * <p> 15588 * You are not required to use the View you provide to the constructor as the basis of the 15589 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15590 * anything you want as the drag shadow. 15591 * </p> 15592 * <p> 15593 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15594 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15595 * size and position of the drag shadow. It uses this data to construct a 15596 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15597 * so that your application can draw the shadow image in the Canvas. 15598 * </p> 15599 * 15600 * <div class="special reference"> 15601 * <h3>Developer Guides</h3> 15602 * <p>For a guide to implementing drag and drop features, read the 15603 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15604 * </div> 15605 */ 15606 public static class DragShadowBuilder { 15607 private final WeakReference<View> mView; 15608 15609 /** 15610 * Constructs a shadow image builder based on a View. By default, the resulting drag 15611 * shadow will have the same appearance and dimensions as the View, with the touch point 15612 * over the center of the View. 15613 * @param view A View. Any View in scope can be used. 15614 */ 15615 public DragShadowBuilder(View view) { 15616 mView = new WeakReference<View>(view); 15617 } 15618 15619 /** 15620 * Construct a shadow builder object with no associated View. This 15621 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15622 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15623 * to supply the drag shadow's dimensions and appearance without 15624 * reference to any View object. If they are not overridden, then the result is an 15625 * invisible drag shadow. 15626 */ 15627 public DragShadowBuilder() { 15628 mView = new WeakReference<View>(null); 15629 } 15630 15631 /** 15632 * Returns the View object that had been passed to the 15633 * {@link #View.DragShadowBuilder(View)} 15634 * constructor. If that View parameter was {@code null} or if the 15635 * {@link #View.DragShadowBuilder()} 15636 * constructor was used to instantiate the builder object, this method will return 15637 * null. 15638 * 15639 * @return The View object associate with this builder object. 15640 */ 15641 @SuppressWarnings({"JavadocReference"}) 15642 final public View getView() { 15643 return mView.get(); 15644 } 15645 15646 /** 15647 * Provides the metrics for the shadow image. These include the dimensions of 15648 * the shadow image, and the point within that shadow that should 15649 * be centered under the touch location while dragging. 15650 * <p> 15651 * The default implementation sets the dimensions of the shadow to be the 15652 * same as the dimensions of the View itself and centers the shadow under 15653 * the touch point. 15654 * </p> 15655 * 15656 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15657 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15658 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15659 * image. 15660 * 15661 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15662 * shadow image that should be underneath the touch point during the drag and drop 15663 * operation. Your application must set {@link android.graphics.Point#x} to the 15664 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15665 */ 15666 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15667 final View view = mView.get(); 15668 if (view != null) { 15669 shadowSize.set(view.getWidth(), view.getHeight()); 15670 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15671 } else { 15672 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15673 } 15674 } 15675 15676 /** 15677 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15678 * based on the dimensions it received from the 15679 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15680 * 15681 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15682 */ 15683 public void onDrawShadow(Canvas canvas) { 15684 final View view = mView.get(); 15685 if (view != null) { 15686 view.draw(canvas); 15687 } else { 15688 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15689 } 15690 } 15691 } 15692 15693 /** 15694 * Starts a drag and drop operation. When your application calls this method, it passes a 15695 * {@link android.view.View.DragShadowBuilder} object to the system. The 15696 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15697 * to get metrics for the drag shadow, and then calls the object's 15698 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15699 * <p> 15700 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15701 * drag events to all the View objects in your application that are currently visible. It does 15702 * this either by calling the View object's drag listener (an implementation of 15703 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15704 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15705 * Both are passed a {@link android.view.DragEvent} object that has a 15706 * {@link android.view.DragEvent#getAction()} value of 15707 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15708 * </p> 15709 * <p> 15710 * Your application can invoke startDrag() on any attached View object. The View object does not 15711 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15712 * be related to the View the user selected for dragging. 15713 * </p> 15714 * @param data A {@link android.content.ClipData} object pointing to the data to be 15715 * transferred by the drag and drop operation. 15716 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15717 * drag shadow. 15718 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15719 * drop operation. This Object is put into every DragEvent object sent by the system during the 15720 * current drag. 15721 * <p> 15722 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15723 * to the target Views. For example, it can contain flags that differentiate between a 15724 * a copy operation and a move operation. 15725 * </p> 15726 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15727 * so the parameter should be set to 0. 15728 * @return {@code true} if the method completes successfully, or 15729 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15730 * do a drag, and so no drag operation is in progress. 15731 */ 15732 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15733 Object myLocalState, int flags) { 15734 if (ViewDebug.DEBUG_DRAG) { 15735 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15736 } 15737 boolean okay = false; 15738 15739 Point shadowSize = new Point(); 15740 Point shadowTouchPoint = new Point(); 15741 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15742 15743 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15744 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15745 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15746 } 15747 15748 if (ViewDebug.DEBUG_DRAG) { 15749 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15750 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15751 } 15752 Surface surface = new Surface(); 15753 try { 15754 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15755 flags, shadowSize.x, shadowSize.y, surface); 15756 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15757 + " surface=" + surface); 15758 if (token != null) { 15759 Canvas canvas = surface.lockCanvas(null); 15760 try { 15761 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15762 shadowBuilder.onDrawShadow(canvas); 15763 } finally { 15764 surface.unlockCanvasAndPost(canvas); 15765 } 15766 15767 final ViewRootImpl root = getViewRootImpl(); 15768 15769 // Cache the local state object for delivery with DragEvents 15770 root.setLocalDragState(myLocalState); 15771 15772 // repurpose 'shadowSize' for the last touch point 15773 root.getLastTouchPoint(shadowSize); 15774 15775 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15776 shadowSize.x, shadowSize.y, 15777 shadowTouchPoint.x, shadowTouchPoint.y, data); 15778 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15779 15780 // Off and running! Release our local surface instance; the drag 15781 // shadow surface is now managed by the system process. 15782 surface.release(); 15783 } 15784 } catch (Exception e) { 15785 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15786 surface.destroy(); 15787 } 15788 15789 return okay; 15790 } 15791 15792 /** 15793 * Handles drag events sent by the system following a call to 15794 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15795 *<p> 15796 * When the system calls this method, it passes a 15797 * {@link android.view.DragEvent} object. A call to 15798 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15799 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15800 * operation. 15801 * @param event The {@link android.view.DragEvent} sent by the system. 15802 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15803 * in DragEvent, indicating the type of drag event represented by this object. 15804 * @return {@code true} if the method was successful, otherwise {@code false}. 15805 * <p> 15806 * The method should return {@code true} in response to an action type of 15807 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15808 * operation. 15809 * </p> 15810 * <p> 15811 * The method should also return {@code true} in response to an action type of 15812 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15813 * {@code false} if it didn't. 15814 * </p> 15815 */ 15816 public boolean onDragEvent(DragEvent event) { 15817 return false; 15818 } 15819 15820 /** 15821 * Detects if this View is enabled and has a drag event listener. 15822 * If both are true, then it calls the drag event listener with the 15823 * {@link android.view.DragEvent} it received. If the drag event listener returns 15824 * {@code true}, then dispatchDragEvent() returns {@code true}. 15825 * <p> 15826 * For all other cases, the method calls the 15827 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15828 * method and returns its result. 15829 * </p> 15830 * <p> 15831 * This ensures that a drag event is always consumed, even if the View does not have a drag 15832 * event listener. However, if the View has a listener and the listener returns true, then 15833 * onDragEvent() is not called. 15834 * </p> 15835 */ 15836 public boolean dispatchDragEvent(DragEvent event) { 15837 //noinspection SimplifiableIfStatement 15838 ListenerInfo li = mListenerInfo; 15839 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15840 && li.mOnDragListener.onDrag(this, event)) { 15841 return true; 15842 } 15843 return onDragEvent(event); 15844 } 15845 15846 boolean canAcceptDrag() { 15847 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15848 } 15849 15850 /** 15851 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15852 * it is ever exposed at all. 15853 * @hide 15854 */ 15855 public void onCloseSystemDialogs(String reason) { 15856 } 15857 15858 /** 15859 * Given a Drawable whose bounds have been set to draw into this view, 15860 * update a Region being computed for 15861 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15862 * that any non-transparent parts of the Drawable are removed from the 15863 * given transparent region. 15864 * 15865 * @param dr The Drawable whose transparency is to be applied to the region. 15866 * @param region A Region holding the current transparency information, 15867 * where any parts of the region that are set are considered to be 15868 * transparent. On return, this region will be modified to have the 15869 * transparency information reduced by the corresponding parts of the 15870 * Drawable that are not transparent. 15871 * {@hide} 15872 */ 15873 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15874 if (DBG) { 15875 Log.i("View", "Getting transparent region for: " + this); 15876 } 15877 final Region r = dr.getTransparentRegion(); 15878 final Rect db = dr.getBounds(); 15879 final AttachInfo attachInfo = mAttachInfo; 15880 if (r != null && attachInfo != null) { 15881 final int w = getRight()-getLeft(); 15882 final int h = getBottom()-getTop(); 15883 if (db.left > 0) { 15884 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15885 r.op(0, 0, db.left, h, Region.Op.UNION); 15886 } 15887 if (db.right < w) { 15888 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15889 r.op(db.right, 0, w, h, Region.Op.UNION); 15890 } 15891 if (db.top > 0) { 15892 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15893 r.op(0, 0, w, db.top, Region.Op.UNION); 15894 } 15895 if (db.bottom < h) { 15896 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15897 r.op(0, db.bottom, w, h, Region.Op.UNION); 15898 } 15899 final int[] location = attachInfo.mTransparentLocation; 15900 getLocationInWindow(location); 15901 r.translate(location[0], location[1]); 15902 region.op(r, Region.Op.INTERSECT); 15903 } else { 15904 region.op(db, Region.Op.DIFFERENCE); 15905 } 15906 } 15907 15908 private void checkForLongClick(int delayOffset) { 15909 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15910 mHasPerformedLongPress = false; 15911 15912 if (mPendingCheckForLongPress == null) { 15913 mPendingCheckForLongPress = new CheckForLongPress(); 15914 } 15915 mPendingCheckForLongPress.rememberWindowAttachCount(); 15916 postDelayed(mPendingCheckForLongPress, 15917 ViewConfiguration.getLongPressTimeout() - delayOffset); 15918 } 15919 } 15920 15921 /** 15922 * Inflate a view from an XML resource. This convenience method wraps the {@link 15923 * LayoutInflater} class, which provides a full range of options for view inflation. 15924 * 15925 * @param context The Context object for your activity or application. 15926 * @param resource The resource ID to inflate 15927 * @param root A view group that will be the parent. Used to properly inflate the 15928 * layout_* parameters. 15929 * @see LayoutInflater 15930 */ 15931 public static View inflate(Context context, int resource, ViewGroup root) { 15932 LayoutInflater factory = LayoutInflater.from(context); 15933 return factory.inflate(resource, root); 15934 } 15935 15936 /** 15937 * Scroll the view with standard behavior for scrolling beyond the normal 15938 * content boundaries. Views that call this method should override 15939 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15940 * results of an over-scroll operation. 15941 * 15942 * Views can use this method to handle any touch or fling-based scrolling. 15943 * 15944 * @param deltaX Change in X in pixels 15945 * @param deltaY Change in Y in pixels 15946 * @param scrollX Current X scroll value in pixels before applying deltaX 15947 * @param scrollY Current Y scroll value in pixels before applying deltaY 15948 * @param scrollRangeX Maximum content scroll range along the X axis 15949 * @param scrollRangeY Maximum content scroll range along the Y axis 15950 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15951 * along the X axis. 15952 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15953 * along the Y axis. 15954 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15955 * @return true if scrolling was clamped to an over-scroll boundary along either 15956 * axis, false otherwise. 15957 */ 15958 @SuppressWarnings({"UnusedParameters"}) 15959 protected boolean overScrollBy(int deltaX, int deltaY, 15960 int scrollX, int scrollY, 15961 int scrollRangeX, int scrollRangeY, 15962 int maxOverScrollX, int maxOverScrollY, 15963 boolean isTouchEvent) { 15964 final int overScrollMode = mOverScrollMode; 15965 final boolean canScrollHorizontal = 15966 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15967 final boolean canScrollVertical = 15968 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15969 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15970 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15971 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15972 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15973 15974 int newScrollX = scrollX + deltaX; 15975 if (!overScrollHorizontal) { 15976 maxOverScrollX = 0; 15977 } 15978 15979 int newScrollY = scrollY + deltaY; 15980 if (!overScrollVertical) { 15981 maxOverScrollY = 0; 15982 } 15983 15984 // Clamp values if at the limits and record 15985 final int left = -maxOverScrollX; 15986 final int right = maxOverScrollX + scrollRangeX; 15987 final int top = -maxOverScrollY; 15988 final int bottom = maxOverScrollY + scrollRangeY; 15989 15990 boolean clampedX = false; 15991 if (newScrollX > right) { 15992 newScrollX = right; 15993 clampedX = true; 15994 } else if (newScrollX < left) { 15995 newScrollX = left; 15996 clampedX = true; 15997 } 15998 15999 boolean clampedY = false; 16000 if (newScrollY > bottom) { 16001 newScrollY = bottom; 16002 clampedY = true; 16003 } else if (newScrollY < top) { 16004 newScrollY = top; 16005 clampedY = true; 16006 } 16007 16008 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16009 16010 return clampedX || clampedY; 16011 } 16012 16013 /** 16014 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16015 * respond to the results of an over-scroll operation. 16016 * 16017 * @param scrollX New X scroll value in pixels 16018 * @param scrollY New Y scroll value in pixels 16019 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16020 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16021 */ 16022 protected void onOverScrolled(int scrollX, int scrollY, 16023 boolean clampedX, boolean clampedY) { 16024 // Intentionally empty. 16025 } 16026 16027 /** 16028 * Returns the over-scroll mode for this view. The result will be 16029 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16030 * (allow over-scrolling only if the view content is larger than the container), 16031 * or {@link #OVER_SCROLL_NEVER}. 16032 * 16033 * @return This view's over-scroll mode. 16034 */ 16035 public int getOverScrollMode() { 16036 return mOverScrollMode; 16037 } 16038 16039 /** 16040 * Set the over-scroll mode for this view. Valid over-scroll modes are 16041 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16042 * (allow over-scrolling only if the view content is larger than the container), 16043 * or {@link #OVER_SCROLL_NEVER}. 16044 * 16045 * Setting the over-scroll mode of a view will have an effect only if the 16046 * view is capable of scrolling. 16047 * 16048 * @param overScrollMode The new over-scroll mode for this view. 16049 */ 16050 public void setOverScrollMode(int overScrollMode) { 16051 if (overScrollMode != OVER_SCROLL_ALWAYS && 16052 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16053 overScrollMode != OVER_SCROLL_NEVER) { 16054 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16055 } 16056 mOverScrollMode = overScrollMode; 16057 } 16058 16059 /** 16060 * Gets a scale factor that determines the distance the view should scroll 16061 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16062 * @return The vertical scroll scale factor. 16063 * @hide 16064 */ 16065 protected float getVerticalScrollFactor() { 16066 if (mVerticalScrollFactor == 0) { 16067 TypedValue outValue = new TypedValue(); 16068 if (!mContext.getTheme().resolveAttribute( 16069 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16070 throw new IllegalStateException( 16071 "Expected theme to define listPreferredItemHeight."); 16072 } 16073 mVerticalScrollFactor = outValue.getDimension( 16074 mContext.getResources().getDisplayMetrics()); 16075 } 16076 return mVerticalScrollFactor; 16077 } 16078 16079 /** 16080 * Gets a scale factor that determines the distance the view should scroll 16081 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16082 * @return The horizontal scroll scale factor. 16083 * @hide 16084 */ 16085 protected float getHorizontalScrollFactor() { 16086 // TODO: Should use something else. 16087 return getVerticalScrollFactor(); 16088 } 16089 16090 /** 16091 * Return the value specifying the text direction or policy that was set with 16092 * {@link #setTextDirection(int)}. 16093 * 16094 * @return the defined text direction. It can be one of: 16095 * 16096 * {@link #TEXT_DIRECTION_INHERIT}, 16097 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16098 * {@link #TEXT_DIRECTION_ANY_RTL}, 16099 * {@link #TEXT_DIRECTION_LTR}, 16100 * {@link #TEXT_DIRECTION_RTL}, 16101 * {@link #TEXT_DIRECTION_LOCALE} 16102 */ 16103 @ViewDebug.ExportedProperty(category = "text", mapping = { 16104 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16105 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16106 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16107 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16108 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16109 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16110 }) 16111 public int getTextDirection() { 16112 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16113 } 16114 16115 /** 16116 * Set the text direction. 16117 * 16118 * @param textDirection the direction to set. Should be one of: 16119 * 16120 * {@link #TEXT_DIRECTION_INHERIT}, 16121 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16122 * {@link #TEXT_DIRECTION_ANY_RTL}, 16123 * {@link #TEXT_DIRECTION_LTR}, 16124 * {@link #TEXT_DIRECTION_RTL}, 16125 * {@link #TEXT_DIRECTION_LOCALE} 16126 */ 16127 public void setTextDirection(int textDirection) { 16128 if (getTextDirection() != textDirection) { 16129 // Reset the current text direction and the resolved one 16130 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16131 resetResolvedTextDirection(); 16132 // Set the new text direction 16133 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16134 // Refresh 16135 requestLayout(); 16136 invalidate(true); 16137 } 16138 } 16139 16140 /** 16141 * Return the resolved text direction. 16142 * 16143 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16144 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16145 * up the parent chain of the view. if there is no parent, then it will return the default 16146 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16147 * 16148 * @return the resolved text direction. Returns one of: 16149 * 16150 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16151 * {@link #TEXT_DIRECTION_ANY_RTL}, 16152 * {@link #TEXT_DIRECTION_LTR}, 16153 * {@link #TEXT_DIRECTION_RTL}, 16154 * {@link #TEXT_DIRECTION_LOCALE} 16155 */ 16156 public int getResolvedTextDirection() { 16157 // The text direction will be resolved only if needed 16158 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16159 resolveTextDirection(); 16160 } 16161 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16162 } 16163 16164 /** 16165 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16166 * resolution is done. 16167 */ 16168 public void resolveTextDirection() { 16169 // Reset any previous text direction resolution 16170 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16171 16172 if (hasRtlSupport()) { 16173 // Set resolved text direction flag depending on text direction flag 16174 final int textDirection = getTextDirection(); 16175 switch(textDirection) { 16176 case TEXT_DIRECTION_INHERIT: 16177 if (canResolveTextDirection()) { 16178 ViewGroup viewGroup = ((ViewGroup) mParent); 16179 16180 // Set current resolved direction to the same value as the parent's one 16181 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16182 switch (parentResolvedDirection) { 16183 case TEXT_DIRECTION_FIRST_STRONG: 16184 case TEXT_DIRECTION_ANY_RTL: 16185 case TEXT_DIRECTION_LTR: 16186 case TEXT_DIRECTION_RTL: 16187 case TEXT_DIRECTION_LOCALE: 16188 mPrivateFlags2 |= 16189 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16190 break; 16191 default: 16192 // Default resolved direction is "first strong" heuristic 16193 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16194 } 16195 } else { 16196 // We cannot do the resolution if there is no parent, so use the default one 16197 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16198 } 16199 break; 16200 case TEXT_DIRECTION_FIRST_STRONG: 16201 case TEXT_DIRECTION_ANY_RTL: 16202 case TEXT_DIRECTION_LTR: 16203 case TEXT_DIRECTION_RTL: 16204 case TEXT_DIRECTION_LOCALE: 16205 // Resolved direction is the same as text direction 16206 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16207 break; 16208 default: 16209 // Default resolved direction is "first strong" heuristic 16210 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16211 } 16212 } else { 16213 // Default resolved direction is "first strong" heuristic 16214 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16215 } 16216 16217 // Set to resolved 16218 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16219 onResolvedTextDirectionChanged(); 16220 } 16221 16222 /** 16223 * Called when text direction has been resolved. Subclasses that care about text direction 16224 * resolution should override this method. 16225 * 16226 * The default implementation does nothing. 16227 */ 16228 public void onResolvedTextDirectionChanged() { 16229 } 16230 16231 /** 16232 * Check if text direction resolution can be done. 16233 * 16234 * @return true if text direction resolution can be done otherwise return false. 16235 */ 16236 public boolean canResolveTextDirection() { 16237 switch (getTextDirection()) { 16238 case TEXT_DIRECTION_INHERIT: 16239 return (mParent != null) && (mParent instanceof ViewGroup); 16240 default: 16241 return true; 16242 } 16243 } 16244 16245 /** 16246 * Reset resolved text direction. Text direction can be resolved with a call to 16247 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16248 * reset is done. 16249 */ 16250 public void resetResolvedTextDirection() { 16251 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16252 onResolvedTextDirectionReset(); 16253 } 16254 16255 /** 16256 * Called when text direction is reset. Subclasses that care about text direction reset should 16257 * override this method and do a reset of the text direction of their children. The default 16258 * implementation does nothing. 16259 */ 16260 public void onResolvedTextDirectionReset() { 16261 } 16262 16263 /** 16264 * Return the value specifying the text alignment or policy that was set with 16265 * {@link #setTextAlignment(int)}. 16266 * 16267 * @return the defined text alignment. It can be one of: 16268 * 16269 * {@link #TEXT_ALIGNMENT_INHERIT}, 16270 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16271 * {@link #TEXT_ALIGNMENT_CENTER}, 16272 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16273 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16274 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16275 * {@link #TEXT_ALIGNMENT_VIEW_END} 16276 */ 16277 @ViewDebug.ExportedProperty(category = "text", mapping = { 16278 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16279 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16280 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16281 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16282 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16283 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16284 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16285 }) 16286 public int getTextAlignment() { 16287 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16288 } 16289 16290 /** 16291 * Set the text alignment. 16292 * 16293 * @param textAlignment The text alignment to set. Should be one of 16294 * 16295 * {@link #TEXT_ALIGNMENT_INHERIT}, 16296 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16297 * {@link #TEXT_ALIGNMENT_CENTER}, 16298 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16299 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16300 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16301 * {@link #TEXT_ALIGNMENT_VIEW_END} 16302 * 16303 * @attr ref android.R.styleable#View_textAlignment 16304 */ 16305 public void setTextAlignment(int textAlignment) { 16306 if (textAlignment != getTextAlignment()) { 16307 // Reset the current and resolved text alignment 16308 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16309 resetResolvedTextAlignment(); 16310 // Set the new text alignment 16311 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16312 // Refresh 16313 requestLayout(); 16314 invalidate(true); 16315 } 16316 } 16317 16318 /** 16319 * Return the resolved text alignment. 16320 * 16321 * The resolved text alignment. This needs resolution if the value is 16322 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16323 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16324 * 16325 * @return the resolved text alignment. Returns one of: 16326 * 16327 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16328 * {@link #TEXT_ALIGNMENT_CENTER}, 16329 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16330 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16331 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16332 * {@link #TEXT_ALIGNMENT_VIEW_END} 16333 */ 16334 @ViewDebug.ExportedProperty(category = "text", mapping = { 16335 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16336 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16337 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16338 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16339 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16340 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16341 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16342 }) 16343 public int getResolvedTextAlignment() { 16344 // If text alignment is not resolved, then resolve it 16345 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16346 resolveTextAlignment(); 16347 } 16348 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16349 } 16350 16351 /** 16352 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16353 * resolution is done. 16354 */ 16355 public void resolveTextAlignment() { 16356 // Reset any previous text alignment resolution 16357 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16358 16359 if (hasRtlSupport()) { 16360 // Set resolved text alignment flag depending on text alignment flag 16361 final int textAlignment = getTextAlignment(); 16362 switch (textAlignment) { 16363 case TEXT_ALIGNMENT_INHERIT: 16364 // Check if we can resolve the text alignment 16365 if (canResolveLayoutDirection() && mParent instanceof View) { 16366 View view = (View) mParent; 16367 16368 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16369 switch (parentResolvedTextAlignment) { 16370 case TEXT_ALIGNMENT_GRAVITY: 16371 case TEXT_ALIGNMENT_TEXT_START: 16372 case TEXT_ALIGNMENT_TEXT_END: 16373 case TEXT_ALIGNMENT_CENTER: 16374 case TEXT_ALIGNMENT_VIEW_START: 16375 case TEXT_ALIGNMENT_VIEW_END: 16376 // Resolved text alignment is the same as the parent resolved 16377 // text alignment 16378 mPrivateFlags2 |= 16379 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16380 break; 16381 default: 16382 // Use default resolved text alignment 16383 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16384 } 16385 } 16386 else { 16387 // We cannot do the resolution if there is no parent so use the default 16388 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16389 } 16390 break; 16391 case TEXT_ALIGNMENT_GRAVITY: 16392 case TEXT_ALIGNMENT_TEXT_START: 16393 case TEXT_ALIGNMENT_TEXT_END: 16394 case TEXT_ALIGNMENT_CENTER: 16395 case TEXT_ALIGNMENT_VIEW_START: 16396 case TEXT_ALIGNMENT_VIEW_END: 16397 // Resolved text alignment is the same as text alignment 16398 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16399 break; 16400 default: 16401 // Use default resolved text alignment 16402 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16403 } 16404 } else { 16405 // Use default resolved text alignment 16406 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16407 } 16408 16409 // Set the resolved 16410 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16411 onResolvedTextAlignmentChanged(); 16412 } 16413 16414 /** 16415 * Check if text alignment resolution can be done. 16416 * 16417 * @return true if text alignment resolution can be done otherwise return false. 16418 */ 16419 public boolean canResolveTextAlignment() { 16420 switch (getTextAlignment()) { 16421 case TEXT_DIRECTION_INHERIT: 16422 return (mParent != null); 16423 default: 16424 return true; 16425 } 16426 } 16427 16428 /** 16429 * Called when text alignment has been resolved. Subclasses that care about text alignment 16430 * resolution should override this method. 16431 * 16432 * The default implementation does nothing. 16433 */ 16434 public void onResolvedTextAlignmentChanged() { 16435 } 16436 16437 /** 16438 * Reset resolved text alignment. Text alignment can be resolved with a call to 16439 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16440 * reset is done. 16441 */ 16442 public void resetResolvedTextAlignment() { 16443 // Reset any previous text alignment resolution 16444 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16445 onResolvedTextAlignmentReset(); 16446 } 16447 16448 /** 16449 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16450 * override this method and do a reset of the text alignment of their children. The default 16451 * implementation does nothing. 16452 */ 16453 public void onResolvedTextAlignmentReset() { 16454 } 16455 16456 // 16457 // Properties 16458 // 16459 /** 16460 * A Property wrapper around the <code>alpha</code> functionality handled by the 16461 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16462 */ 16463 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16464 @Override 16465 public void setValue(View object, float value) { 16466 object.setAlpha(value); 16467 } 16468 16469 @Override 16470 public Float get(View object) { 16471 return object.getAlpha(); 16472 } 16473 }; 16474 16475 /** 16476 * A Property wrapper around the <code>translationX</code> functionality handled by the 16477 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16478 */ 16479 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16480 @Override 16481 public void setValue(View object, float value) { 16482 object.setTranslationX(value); 16483 } 16484 16485 @Override 16486 public Float get(View object) { 16487 return object.getTranslationX(); 16488 } 16489 }; 16490 16491 /** 16492 * A Property wrapper around the <code>translationY</code> functionality handled by the 16493 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16494 */ 16495 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16496 @Override 16497 public void setValue(View object, float value) { 16498 object.setTranslationY(value); 16499 } 16500 16501 @Override 16502 public Float get(View object) { 16503 return object.getTranslationY(); 16504 } 16505 }; 16506 16507 /** 16508 * A Property wrapper around the <code>x</code> functionality handled by the 16509 * {@link View#setX(float)} and {@link View#getX()} methods. 16510 */ 16511 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16512 @Override 16513 public void setValue(View object, float value) { 16514 object.setX(value); 16515 } 16516 16517 @Override 16518 public Float get(View object) { 16519 return object.getX(); 16520 } 16521 }; 16522 16523 /** 16524 * A Property wrapper around the <code>y</code> functionality handled by the 16525 * {@link View#setY(float)} and {@link View#getY()} methods. 16526 */ 16527 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16528 @Override 16529 public void setValue(View object, float value) { 16530 object.setY(value); 16531 } 16532 16533 @Override 16534 public Float get(View object) { 16535 return object.getY(); 16536 } 16537 }; 16538 16539 /** 16540 * A Property wrapper around the <code>rotation</code> functionality handled by the 16541 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16542 */ 16543 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16544 @Override 16545 public void setValue(View object, float value) { 16546 object.setRotation(value); 16547 } 16548 16549 @Override 16550 public Float get(View object) { 16551 return object.getRotation(); 16552 } 16553 }; 16554 16555 /** 16556 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16557 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16558 */ 16559 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16560 @Override 16561 public void setValue(View object, float value) { 16562 object.setRotationX(value); 16563 } 16564 16565 @Override 16566 public Float get(View object) { 16567 return object.getRotationX(); 16568 } 16569 }; 16570 16571 /** 16572 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16573 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16574 */ 16575 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16576 @Override 16577 public void setValue(View object, float value) { 16578 object.setRotationY(value); 16579 } 16580 16581 @Override 16582 public Float get(View object) { 16583 return object.getRotationY(); 16584 } 16585 }; 16586 16587 /** 16588 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16589 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16590 */ 16591 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16592 @Override 16593 public void setValue(View object, float value) { 16594 object.setScaleX(value); 16595 } 16596 16597 @Override 16598 public Float get(View object) { 16599 return object.getScaleX(); 16600 } 16601 }; 16602 16603 /** 16604 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16605 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16606 */ 16607 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16608 @Override 16609 public void setValue(View object, float value) { 16610 object.setScaleY(value); 16611 } 16612 16613 @Override 16614 public Float get(View object) { 16615 return object.getScaleY(); 16616 } 16617 }; 16618 16619 /** 16620 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16621 * Each MeasureSpec represents a requirement for either the width or the height. 16622 * A MeasureSpec is comprised of a size and a mode. There are three possible 16623 * modes: 16624 * <dl> 16625 * <dt>UNSPECIFIED</dt> 16626 * <dd> 16627 * The parent has not imposed any constraint on the child. It can be whatever size 16628 * it wants. 16629 * </dd> 16630 * 16631 * <dt>EXACTLY</dt> 16632 * <dd> 16633 * The parent has determined an exact size for the child. The child is going to be 16634 * given those bounds regardless of how big it wants to be. 16635 * </dd> 16636 * 16637 * <dt>AT_MOST</dt> 16638 * <dd> 16639 * The child can be as large as it wants up to the specified size. 16640 * </dd> 16641 * </dl> 16642 * 16643 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16644 * is provided to pack and unpack the <size, mode> tuple into the int. 16645 */ 16646 public static class MeasureSpec { 16647 private static final int MODE_SHIFT = 30; 16648 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16649 16650 /** 16651 * Measure specification mode: The parent has not imposed any constraint 16652 * on the child. It can be whatever size it wants. 16653 */ 16654 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16655 16656 /** 16657 * Measure specification mode: The parent has determined an exact size 16658 * for the child. The child is going to be given those bounds regardless 16659 * of how big it wants to be. 16660 */ 16661 public static final int EXACTLY = 1 << MODE_SHIFT; 16662 16663 /** 16664 * Measure specification mode: The child can be as large as it wants up 16665 * to the specified size. 16666 */ 16667 public static final int AT_MOST = 2 << MODE_SHIFT; 16668 16669 /** 16670 * Creates a measure specification based on the supplied size and mode. 16671 * 16672 * The mode must always be one of the following: 16673 * <ul> 16674 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16675 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16676 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16677 * </ul> 16678 * 16679 * @param size the size of the measure specification 16680 * @param mode the mode of the measure specification 16681 * @return the measure specification based on size and mode 16682 */ 16683 public static int makeMeasureSpec(int size, int mode) { 16684 return size + mode; 16685 } 16686 16687 /** 16688 * Extracts the mode from the supplied measure specification. 16689 * 16690 * @param measureSpec the measure specification to extract the mode from 16691 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16692 * {@link android.view.View.MeasureSpec#AT_MOST} or 16693 * {@link android.view.View.MeasureSpec#EXACTLY} 16694 */ 16695 public static int getMode(int measureSpec) { 16696 return (measureSpec & MODE_MASK); 16697 } 16698 16699 /** 16700 * Extracts the size from the supplied measure specification. 16701 * 16702 * @param measureSpec the measure specification to extract the size from 16703 * @return the size in pixels defined in the supplied measure specification 16704 */ 16705 public static int getSize(int measureSpec) { 16706 return (measureSpec & ~MODE_MASK); 16707 } 16708 16709 /** 16710 * Returns a String representation of the specified measure 16711 * specification. 16712 * 16713 * @param measureSpec the measure specification to convert to a String 16714 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16715 */ 16716 public static String toString(int measureSpec) { 16717 int mode = getMode(measureSpec); 16718 int size = getSize(measureSpec); 16719 16720 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16721 16722 if (mode == UNSPECIFIED) 16723 sb.append("UNSPECIFIED "); 16724 else if (mode == EXACTLY) 16725 sb.append("EXACTLY "); 16726 else if (mode == AT_MOST) 16727 sb.append("AT_MOST "); 16728 else 16729 sb.append(mode).append(" "); 16730 16731 sb.append(size); 16732 return sb.toString(); 16733 } 16734 } 16735 16736 class CheckForLongPress implements Runnable { 16737 16738 private int mOriginalWindowAttachCount; 16739 16740 public void run() { 16741 if (isPressed() && (mParent != null) 16742 && mOriginalWindowAttachCount == mWindowAttachCount) { 16743 if (performLongClick()) { 16744 mHasPerformedLongPress = true; 16745 } 16746 } 16747 } 16748 16749 public void rememberWindowAttachCount() { 16750 mOriginalWindowAttachCount = mWindowAttachCount; 16751 } 16752 } 16753 16754 private final class CheckForTap implements Runnable { 16755 public void run() { 16756 mPrivateFlags &= ~PREPRESSED; 16757 setPressed(true); 16758 checkForLongClick(ViewConfiguration.getTapTimeout()); 16759 } 16760 } 16761 16762 private final class PerformClick implements Runnable { 16763 public void run() { 16764 performClick(); 16765 } 16766 } 16767 16768 /** @hide */ 16769 public void hackTurnOffWindowResizeAnim(boolean off) { 16770 mAttachInfo.mTurnOffWindowResizeAnim = off; 16771 } 16772 16773 /** 16774 * This method returns a ViewPropertyAnimator object, which can be used to animate 16775 * specific properties on this View. 16776 * 16777 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16778 */ 16779 public ViewPropertyAnimator animate() { 16780 if (mAnimator == null) { 16781 mAnimator = new ViewPropertyAnimator(this); 16782 } 16783 return mAnimator; 16784 } 16785 16786 /** 16787 * Interface definition for a callback to be invoked when a hardware key event is 16788 * dispatched to this view. The callback will be invoked before the key event is 16789 * given to the view. This is only useful for hardware keyboards; a software input 16790 * method has no obligation to trigger this listener. 16791 */ 16792 public interface OnKeyListener { 16793 /** 16794 * Called when a hardware key is dispatched to a view. This allows listeners to 16795 * get a chance to respond before the target view. 16796 * <p>Key presses in software keyboards will generally NOT trigger this method, 16797 * although some may elect to do so in some situations. Do not assume a 16798 * software input method has to be key-based; even if it is, it may use key presses 16799 * in a different way than you expect, so there is no way to reliably catch soft 16800 * input key presses. 16801 * 16802 * @param v The view the key has been dispatched to. 16803 * @param keyCode The code for the physical key that was pressed 16804 * @param event The KeyEvent object containing full information about 16805 * the event. 16806 * @return True if the listener has consumed the event, false otherwise. 16807 */ 16808 boolean onKey(View v, int keyCode, KeyEvent event); 16809 } 16810 16811 /** 16812 * Interface definition for a callback to be invoked when a touch event is 16813 * dispatched to this view. The callback will be invoked before the touch 16814 * event is given to the view. 16815 */ 16816 public interface OnTouchListener { 16817 /** 16818 * Called when a touch event is dispatched to a view. This allows listeners to 16819 * get a chance to respond before the target view. 16820 * 16821 * @param v The view the touch event has been dispatched to. 16822 * @param event The MotionEvent object containing full information about 16823 * the event. 16824 * @return True if the listener has consumed the event, false otherwise. 16825 */ 16826 boolean onTouch(View v, MotionEvent event); 16827 } 16828 16829 /** 16830 * Interface definition for a callback to be invoked when a hover event is 16831 * dispatched to this view. The callback will be invoked before the hover 16832 * event is given to the view. 16833 */ 16834 public interface OnHoverListener { 16835 /** 16836 * Called when a hover event is dispatched to a view. This allows listeners to 16837 * get a chance to respond before the target view. 16838 * 16839 * @param v The view the hover event has been dispatched to. 16840 * @param event The MotionEvent object containing full information about 16841 * the event. 16842 * @return True if the listener has consumed the event, false otherwise. 16843 */ 16844 boolean onHover(View v, MotionEvent event); 16845 } 16846 16847 /** 16848 * Interface definition for a callback to be invoked when a generic motion event is 16849 * dispatched to this view. The callback will be invoked before the generic motion 16850 * event is given to the view. 16851 */ 16852 public interface OnGenericMotionListener { 16853 /** 16854 * Called when a generic motion event is dispatched to a view. This allows listeners to 16855 * get a chance to respond before the target view. 16856 * 16857 * @param v The view the generic motion event has been dispatched to. 16858 * @param event The MotionEvent object containing full information about 16859 * the event. 16860 * @return True if the listener has consumed the event, false otherwise. 16861 */ 16862 boolean onGenericMotion(View v, MotionEvent event); 16863 } 16864 16865 /** 16866 * Interface definition for a callback to be invoked when a view has been clicked and held. 16867 */ 16868 public interface OnLongClickListener { 16869 /** 16870 * Called when a view has been clicked and held. 16871 * 16872 * @param v The view that was clicked and held. 16873 * 16874 * @return true if the callback consumed the long click, false otherwise. 16875 */ 16876 boolean onLongClick(View v); 16877 } 16878 16879 /** 16880 * Interface definition for a callback to be invoked when a drag is being dispatched 16881 * to this view. The callback will be invoked before the hosting view's own 16882 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16883 * onDrag(event) behavior, it should return 'false' from this callback. 16884 * 16885 * <div class="special reference"> 16886 * <h3>Developer Guides</h3> 16887 * <p>For a guide to implementing drag and drop features, read the 16888 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16889 * </div> 16890 */ 16891 public interface OnDragListener { 16892 /** 16893 * Called when a drag event is dispatched to a view. This allows listeners 16894 * to get a chance to override base View behavior. 16895 * 16896 * @param v The View that received the drag event. 16897 * @param event The {@link android.view.DragEvent} object for the drag event. 16898 * @return {@code true} if the drag event was handled successfully, or {@code false} 16899 * if the drag event was not handled. Note that {@code false} will trigger the View 16900 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16901 */ 16902 boolean onDrag(View v, DragEvent event); 16903 } 16904 16905 /** 16906 * Interface definition for a callback to be invoked when the focus state of 16907 * a view changed. 16908 */ 16909 public interface OnFocusChangeListener { 16910 /** 16911 * Called when the focus state of a view has changed. 16912 * 16913 * @param v The view whose state has changed. 16914 * @param hasFocus The new focus state of v. 16915 */ 16916 void onFocusChange(View v, boolean hasFocus); 16917 } 16918 16919 /** 16920 * Interface definition for a callback to be invoked when a view is clicked. 16921 */ 16922 public interface OnClickListener { 16923 /** 16924 * Called when a view has been clicked. 16925 * 16926 * @param v The view that was clicked. 16927 */ 16928 void onClick(View v); 16929 } 16930 16931 /** 16932 * Interface definition for a callback to be invoked when the context menu 16933 * for this view is being built. 16934 */ 16935 public interface OnCreateContextMenuListener { 16936 /** 16937 * Called when the context menu for this view is being built. It is not 16938 * safe to hold onto the menu after this method returns. 16939 * 16940 * @param menu The context menu that is being built 16941 * @param v The view for which the context menu is being built 16942 * @param menuInfo Extra information about the item for which the 16943 * context menu should be shown. This information will vary 16944 * depending on the class of v. 16945 */ 16946 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16947 } 16948 16949 /** 16950 * Interface definition for a callback to be invoked when the status bar changes 16951 * visibility. This reports <strong>global</strong> changes to the system UI 16952 * state, not what the application is requesting. 16953 * 16954 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16955 */ 16956 public interface OnSystemUiVisibilityChangeListener { 16957 /** 16958 * Called when the status bar changes visibility because of a call to 16959 * {@link View#setSystemUiVisibility(int)}. 16960 * 16961 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16962 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16963 * This tells you the <strong>global</strong> state of these UI visibility 16964 * flags, not what your app is currently applying. 16965 */ 16966 public void onSystemUiVisibilityChange(int visibility); 16967 } 16968 16969 /** 16970 * Interface definition for a callback to be invoked when this view is attached 16971 * or detached from its window. 16972 */ 16973 public interface OnAttachStateChangeListener { 16974 /** 16975 * Called when the view is attached to a window. 16976 * @param v The view that was attached 16977 */ 16978 public void onViewAttachedToWindow(View v); 16979 /** 16980 * Called when the view is detached from a window. 16981 * @param v The view that was detached 16982 */ 16983 public void onViewDetachedFromWindow(View v); 16984 } 16985 16986 private final class UnsetPressedState implements Runnable { 16987 public void run() { 16988 setPressed(false); 16989 } 16990 } 16991 16992 /** 16993 * Base class for derived classes that want to save and restore their own 16994 * state in {@link android.view.View#onSaveInstanceState()}. 16995 */ 16996 public static class BaseSavedState extends AbsSavedState { 16997 /** 16998 * Constructor used when reading from a parcel. Reads the state of the superclass. 16999 * 17000 * @param source 17001 */ 17002 public BaseSavedState(Parcel source) { 17003 super(source); 17004 } 17005 17006 /** 17007 * Constructor called by derived classes when creating their SavedState objects 17008 * 17009 * @param superState The state of the superclass of this view 17010 */ 17011 public BaseSavedState(Parcelable superState) { 17012 super(superState); 17013 } 17014 17015 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17016 new Parcelable.Creator<BaseSavedState>() { 17017 public BaseSavedState createFromParcel(Parcel in) { 17018 return new BaseSavedState(in); 17019 } 17020 17021 public BaseSavedState[] newArray(int size) { 17022 return new BaseSavedState[size]; 17023 } 17024 }; 17025 } 17026 17027 /** 17028 * A set of information given to a view when it is attached to its parent 17029 * window. 17030 */ 17031 static class AttachInfo { 17032 interface Callbacks { 17033 void playSoundEffect(int effectId); 17034 boolean performHapticFeedback(int effectId, boolean always); 17035 } 17036 17037 /** 17038 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17039 * to a Handler. This class contains the target (View) to invalidate and 17040 * the coordinates of the dirty rectangle. 17041 * 17042 * For performance purposes, this class also implements a pool of up to 17043 * POOL_LIMIT objects that get reused. This reduces memory allocations 17044 * whenever possible. 17045 */ 17046 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17047 private static final int POOL_LIMIT = 10; 17048 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17049 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17050 public InvalidateInfo newInstance() { 17051 return new InvalidateInfo(); 17052 } 17053 17054 public void onAcquired(InvalidateInfo element) { 17055 } 17056 17057 public void onReleased(InvalidateInfo element) { 17058 element.target = null; 17059 } 17060 }, POOL_LIMIT) 17061 ); 17062 17063 private InvalidateInfo mNext; 17064 private boolean mIsPooled; 17065 17066 View target; 17067 17068 int left; 17069 int top; 17070 int right; 17071 int bottom; 17072 17073 public void setNextPoolable(InvalidateInfo element) { 17074 mNext = element; 17075 } 17076 17077 public InvalidateInfo getNextPoolable() { 17078 return mNext; 17079 } 17080 17081 static InvalidateInfo acquire() { 17082 return sPool.acquire(); 17083 } 17084 17085 void release() { 17086 sPool.release(this); 17087 } 17088 17089 public boolean isPooled() { 17090 return mIsPooled; 17091 } 17092 17093 public void setPooled(boolean isPooled) { 17094 mIsPooled = isPooled; 17095 } 17096 } 17097 17098 final IWindowSession mSession; 17099 17100 final IWindow mWindow; 17101 17102 final IBinder mWindowToken; 17103 17104 final Callbacks mRootCallbacks; 17105 17106 HardwareCanvas mHardwareCanvas; 17107 17108 /** 17109 * The top view of the hierarchy. 17110 */ 17111 View mRootView; 17112 17113 IBinder mPanelParentWindowToken; 17114 Surface mSurface; 17115 17116 boolean mHardwareAccelerated; 17117 boolean mHardwareAccelerationRequested; 17118 HardwareRenderer mHardwareRenderer; 17119 17120 boolean mScreenOn; 17121 17122 /** 17123 * Scale factor used by the compatibility mode 17124 */ 17125 float mApplicationScale; 17126 17127 /** 17128 * Indicates whether the application is in compatibility mode 17129 */ 17130 boolean mScalingRequired; 17131 17132 /** 17133 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17134 */ 17135 boolean mTurnOffWindowResizeAnim; 17136 17137 /** 17138 * Left position of this view's window 17139 */ 17140 int mWindowLeft; 17141 17142 /** 17143 * Top position of this view's window 17144 */ 17145 int mWindowTop; 17146 17147 /** 17148 * Left actual position of this view's window. 17149 * 17150 * TODO: This is a workaround for 6623031. Remove when fixed. 17151 */ 17152 int mActualWindowLeft; 17153 17154 /** 17155 * Actual top position of this view's window. 17156 * 17157 * TODO: This is a workaround for 6623031. Remove when fixed. 17158 */ 17159 int mActualWindowTop; 17160 17161 /** 17162 * Indicates whether views need to use 32-bit drawing caches 17163 */ 17164 boolean mUse32BitDrawingCache; 17165 17166 /** 17167 * For windows that are full-screen but using insets to layout inside 17168 * of the screen decorations, these are the current insets for the 17169 * content of the window. 17170 */ 17171 final Rect mContentInsets = new Rect(); 17172 17173 /** 17174 * For windows that are full-screen but using insets to layout inside 17175 * of the screen decorations, these are the current insets for the 17176 * actual visible parts of the window. 17177 */ 17178 final Rect mVisibleInsets = new Rect(); 17179 17180 /** 17181 * The internal insets given by this window. This value is 17182 * supplied by the client (through 17183 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17184 * be given to the window manager when changed to be used in laying 17185 * out windows behind it. 17186 */ 17187 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17188 = new ViewTreeObserver.InternalInsetsInfo(); 17189 17190 /** 17191 * All views in the window's hierarchy that serve as scroll containers, 17192 * used to determine if the window can be resized or must be panned 17193 * to adjust for a soft input area. 17194 */ 17195 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17196 17197 final KeyEvent.DispatcherState mKeyDispatchState 17198 = new KeyEvent.DispatcherState(); 17199 17200 /** 17201 * Indicates whether the view's window currently has the focus. 17202 */ 17203 boolean mHasWindowFocus; 17204 17205 /** 17206 * The current visibility of the window. 17207 */ 17208 int mWindowVisibility; 17209 17210 /** 17211 * Indicates the time at which drawing started to occur. 17212 */ 17213 long mDrawingTime; 17214 17215 /** 17216 * Indicates whether or not ignoring the DIRTY_MASK flags. 17217 */ 17218 boolean mIgnoreDirtyState; 17219 17220 /** 17221 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17222 * to avoid clearing that flag prematurely. 17223 */ 17224 boolean mSetIgnoreDirtyState = false; 17225 17226 /** 17227 * Indicates whether the view's window is currently in touch mode. 17228 */ 17229 boolean mInTouchMode; 17230 17231 /** 17232 * Indicates that ViewAncestor should trigger a global layout change 17233 * the next time it performs a traversal 17234 */ 17235 boolean mRecomputeGlobalAttributes; 17236 17237 /** 17238 * Always report new attributes at next traversal. 17239 */ 17240 boolean mForceReportNewAttributes; 17241 17242 /** 17243 * Set during a traveral if any views want to keep the screen on. 17244 */ 17245 boolean mKeepScreenOn; 17246 17247 /** 17248 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17249 */ 17250 int mSystemUiVisibility; 17251 17252 /** 17253 * Hack to force certain system UI visibility flags to be cleared. 17254 */ 17255 int mDisabledSystemUiVisibility; 17256 17257 /** 17258 * Last global system UI visibility reported by the window manager. 17259 */ 17260 int mGlobalSystemUiVisibility; 17261 17262 /** 17263 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17264 * attached. 17265 */ 17266 boolean mHasSystemUiListeners; 17267 17268 /** 17269 * Set if the visibility of any views has changed. 17270 */ 17271 boolean mViewVisibilityChanged; 17272 17273 /** 17274 * Set to true if a view has been scrolled. 17275 */ 17276 boolean mViewScrollChanged; 17277 17278 /** 17279 * Global to the view hierarchy used as a temporary for dealing with 17280 * x/y points in the transparent region computations. 17281 */ 17282 final int[] mTransparentLocation = new int[2]; 17283 17284 /** 17285 * Global to the view hierarchy used as a temporary for dealing with 17286 * x/y points in the ViewGroup.invalidateChild implementation. 17287 */ 17288 final int[] mInvalidateChildLocation = new int[2]; 17289 17290 17291 /** 17292 * Global to the view hierarchy used as a temporary for dealing with 17293 * x/y location when view is transformed. 17294 */ 17295 final float[] mTmpTransformLocation = new float[2]; 17296 17297 /** 17298 * The view tree observer used to dispatch global events like 17299 * layout, pre-draw, touch mode change, etc. 17300 */ 17301 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17302 17303 /** 17304 * A Canvas used by the view hierarchy to perform bitmap caching. 17305 */ 17306 Canvas mCanvas; 17307 17308 /** 17309 * The view root impl. 17310 */ 17311 final ViewRootImpl mViewRootImpl; 17312 17313 /** 17314 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17315 * handler can be used to pump events in the UI events queue. 17316 */ 17317 final Handler mHandler; 17318 17319 /** 17320 * Temporary for use in computing invalidate rectangles while 17321 * calling up the hierarchy. 17322 */ 17323 final Rect mTmpInvalRect = new Rect(); 17324 17325 /** 17326 * Temporary for use in computing hit areas with transformed views 17327 */ 17328 final RectF mTmpTransformRect = new RectF(); 17329 17330 /** 17331 * Temporary list for use in collecting focusable descendents of a view. 17332 */ 17333 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17334 17335 /** 17336 * The id of the window for accessibility purposes. 17337 */ 17338 int mAccessibilityWindowId = View.NO_ID; 17339 17340 /** 17341 * Whether to ingore not exposed for accessibility Views when 17342 * reporting the view tree to accessibility services. 17343 */ 17344 boolean mIncludeNotImportantViews; 17345 17346 /** 17347 * The drawable for highlighting accessibility focus. 17348 */ 17349 Drawable mAccessibilityFocusDrawable; 17350 17351 /** 17352 * Show where the margins, bounds and layout bounds are for each view. 17353 */ 17354 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17355 17356 /** 17357 * Point used to compute visible regions. 17358 */ 17359 final Point mPoint = new Point(); 17360 17361 /** 17362 * Creates a new set of attachment information with the specified 17363 * events handler and thread. 17364 * 17365 * @param handler the events handler the view must use 17366 */ 17367 AttachInfo(IWindowSession session, IWindow window, 17368 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17369 mSession = session; 17370 mWindow = window; 17371 mWindowToken = window.asBinder(); 17372 mViewRootImpl = viewRootImpl; 17373 mHandler = handler; 17374 mRootCallbacks = effectPlayer; 17375 } 17376 } 17377 17378 /** 17379 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17380 * is supported. This avoids keeping too many unused fields in most 17381 * instances of View.</p> 17382 */ 17383 private static class ScrollabilityCache implements Runnable { 17384 17385 /** 17386 * Scrollbars are not visible 17387 */ 17388 public static final int OFF = 0; 17389 17390 /** 17391 * Scrollbars are visible 17392 */ 17393 public static final int ON = 1; 17394 17395 /** 17396 * Scrollbars are fading away 17397 */ 17398 public static final int FADING = 2; 17399 17400 public boolean fadeScrollBars; 17401 17402 public int fadingEdgeLength; 17403 public int scrollBarDefaultDelayBeforeFade; 17404 public int scrollBarFadeDuration; 17405 17406 public int scrollBarSize; 17407 public ScrollBarDrawable scrollBar; 17408 public float[] interpolatorValues; 17409 public View host; 17410 17411 public final Paint paint; 17412 public final Matrix matrix; 17413 public Shader shader; 17414 17415 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17416 17417 private static final float[] OPAQUE = { 255 }; 17418 private static final float[] TRANSPARENT = { 0.0f }; 17419 17420 /** 17421 * When fading should start. This time moves into the future every time 17422 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17423 */ 17424 public long fadeStartTime; 17425 17426 17427 /** 17428 * The current state of the scrollbars: ON, OFF, or FADING 17429 */ 17430 public int state = OFF; 17431 17432 private int mLastColor; 17433 17434 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17435 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17436 scrollBarSize = configuration.getScaledScrollBarSize(); 17437 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17438 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17439 17440 paint = new Paint(); 17441 matrix = new Matrix(); 17442 // use use a height of 1, and then wack the matrix each time we 17443 // actually use it. 17444 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17445 17446 paint.setShader(shader); 17447 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17448 this.host = host; 17449 } 17450 17451 public void setFadeColor(int color) { 17452 if (color != 0 && color != mLastColor) { 17453 mLastColor = color; 17454 color |= 0xFF000000; 17455 17456 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17457 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17458 17459 paint.setShader(shader); 17460 // Restore the default transfer mode (src_over) 17461 paint.setXfermode(null); 17462 } 17463 } 17464 17465 public void run() { 17466 long now = AnimationUtils.currentAnimationTimeMillis(); 17467 if (now >= fadeStartTime) { 17468 17469 // the animation fades the scrollbars out by changing 17470 // the opacity (alpha) from fully opaque to fully 17471 // transparent 17472 int nextFrame = (int) now; 17473 int framesCount = 0; 17474 17475 Interpolator interpolator = scrollBarInterpolator; 17476 17477 // Start opaque 17478 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17479 17480 // End transparent 17481 nextFrame += scrollBarFadeDuration; 17482 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17483 17484 state = FADING; 17485 17486 // Kick off the fade animation 17487 host.invalidate(true); 17488 } 17489 } 17490 } 17491 17492 /** 17493 * Resuable callback for sending 17494 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17495 */ 17496 private class SendViewScrolledAccessibilityEvent implements Runnable { 17497 public volatile boolean mIsPending; 17498 17499 public void run() { 17500 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17501 mIsPending = false; 17502 } 17503 } 17504 17505 /** 17506 * <p> 17507 * This class represents a delegate that can be registered in a {@link View} 17508 * to enhance accessibility support via composition rather via inheritance. 17509 * It is specifically targeted to widget developers that extend basic View 17510 * classes i.e. classes in package android.view, that would like their 17511 * applications to be backwards compatible. 17512 * </p> 17513 * <div class="special reference"> 17514 * <h3>Developer Guides</h3> 17515 * <p>For more information about making applications accessible, read the 17516 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17517 * developer guide.</p> 17518 * </div> 17519 * <p> 17520 * A scenario in which a developer would like to use an accessibility delegate 17521 * is overriding a method introduced in a later API version then the minimal API 17522 * version supported by the application. For example, the method 17523 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17524 * in API version 4 when the accessibility APIs were first introduced. If a 17525 * developer would like his application to run on API version 4 devices (assuming 17526 * all other APIs used by the application are version 4 or lower) and take advantage 17527 * of this method, instead of overriding the method which would break the application's 17528 * backwards compatibility, he can override the corresponding method in this 17529 * delegate and register the delegate in the target View if the API version of 17530 * the system is high enough i.e. the API version is same or higher to the API 17531 * version that introduced 17532 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17533 * </p> 17534 * <p> 17535 * Here is an example implementation: 17536 * </p> 17537 * <code><pre><p> 17538 * if (Build.VERSION.SDK_INT >= 14) { 17539 * // If the API version is equal of higher than the version in 17540 * // which onInitializeAccessibilityNodeInfo was introduced we 17541 * // register a delegate with a customized implementation. 17542 * View view = findViewById(R.id.view_id); 17543 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17544 * public void onInitializeAccessibilityNodeInfo(View host, 17545 * AccessibilityNodeInfo info) { 17546 * // Let the default implementation populate the info. 17547 * super.onInitializeAccessibilityNodeInfo(host, info); 17548 * // Set some other information. 17549 * info.setEnabled(host.isEnabled()); 17550 * } 17551 * }); 17552 * } 17553 * </code></pre></p> 17554 * <p> 17555 * This delegate contains methods that correspond to the accessibility methods 17556 * in View. If a delegate has been specified the implementation in View hands 17557 * off handling to the corresponding method in this delegate. The default 17558 * implementation the delegate methods behaves exactly as the corresponding 17559 * method in View for the case of no accessibility delegate been set. Hence, 17560 * to customize the behavior of a View method, clients can override only the 17561 * corresponding delegate method without altering the behavior of the rest 17562 * accessibility related methods of the host view. 17563 * </p> 17564 */ 17565 public static class AccessibilityDelegate { 17566 17567 /** 17568 * Sends an accessibility event of the given type. If accessibility is not 17569 * enabled this method has no effect. 17570 * <p> 17571 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17572 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17573 * been set. 17574 * </p> 17575 * 17576 * @param host The View hosting the delegate. 17577 * @param eventType The type of the event to send. 17578 * 17579 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17580 */ 17581 public void sendAccessibilityEvent(View host, int eventType) { 17582 host.sendAccessibilityEventInternal(eventType); 17583 } 17584 17585 /** 17586 * Performs the specified accessibility action on the view. For 17587 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17588 * <p> 17589 * The default implementation behaves as 17590 * {@link View#performAccessibilityAction(int, Bundle) 17591 * View#performAccessibilityAction(int, Bundle)} for the case of 17592 * no accessibility delegate been set. 17593 * </p> 17594 * 17595 * @param action The action to perform. 17596 * @return Whether the action was performed. 17597 * 17598 * @see View#performAccessibilityAction(int, Bundle) 17599 * View#performAccessibilityAction(int, Bundle) 17600 */ 17601 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17602 return host.performAccessibilityActionInternal(action, args); 17603 } 17604 17605 /** 17606 * Sends an accessibility event. This method behaves exactly as 17607 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17608 * empty {@link AccessibilityEvent} and does not perform a check whether 17609 * accessibility is enabled. 17610 * <p> 17611 * The default implementation behaves as 17612 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17613 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17614 * the case of no accessibility delegate been set. 17615 * </p> 17616 * 17617 * @param host The View hosting the delegate. 17618 * @param event The event to send. 17619 * 17620 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17621 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17622 */ 17623 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17624 host.sendAccessibilityEventUncheckedInternal(event); 17625 } 17626 17627 /** 17628 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17629 * to its children for adding their text content to the event. 17630 * <p> 17631 * The default implementation behaves as 17632 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17633 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17634 * the case of no accessibility delegate been set. 17635 * </p> 17636 * 17637 * @param host The View hosting the delegate. 17638 * @param event The event. 17639 * @return True if the event population was completed. 17640 * 17641 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17642 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17643 */ 17644 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17645 return host.dispatchPopulateAccessibilityEventInternal(event); 17646 } 17647 17648 /** 17649 * Gives a chance to the host View to populate the accessibility event with its 17650 * text content. 17651 * <p> 17652 * The default implementation behaves as 17653 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17654 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17655 * the case of no accessibility delegate been set. 17656 * </p> 17657 * 17658 * @param host The View hosting the delegate. 17659 * @param event The accessibility event which to populate. 17660 * 17661 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17662 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17663 */ 17664 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17665 host.onPopulateAccessibilityEventInternal(event); 17666 } 17667 17668 /** 17669 * Initializes an {@link AccessibilityEvent} with information about the 17670 * the host View which is the event source. 17671 * <p> 17672 * The default implementation behaves as 17673 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17674 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17675 * the case of no accessibility delegate been set. 17676 * </p> 17677 * 17678 * @param host The View hosting the delegate. 17679 * @param event The event to initialize. 17680 * 17681 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17682 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17683 */ 17684 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17685 host.onInitializeAccessibilityEventInternal(event); 17686 } 17687 17688 /** 17689 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17690 * <p> 17691 * The default implementation behaves as 17692 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17693 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17694 * the case of no accessibility delegate been set. 17695 * </p> 17696 * 17697 * @param host The View hosting the delegate. 17698 * @param info The instance to initialize. 17699 * 17700 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17701 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17702 */ 17703 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17704 host.onInitializeAccessibilityNodeInfoInternal(info); 17705 } 17706 17707 /** 17708 * Called when a child of the host View has requested sending an 17709 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17710 * to augment the event. 17711 * <p> 17712 * The default implementation behaves as 17713 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17714 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17715 * the case of no accessibility delegate been set. 17716 * </p> 17717 * 17718 * @param host The View hosting the delegate. 17719 * @param child The child which requests sending the event. 17720 * @param event The event to be sent. 17721 * @return True if the event should be sent 17722 * 17723 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17724 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17725 */ 17726 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17727 AccessibilityEvent event) { 17728 return host.onRequestSendAccessibilityEventInternal(child, event); 17729 } 17730 17731 /** 17732 * Gets the provider for managing a virtual view hierarchy rooted at this View 17733 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17734 * that explore the window content. 17735 * <p> 17736 * The default implementation behaves as 17737 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17738 * the case of no accessibility delegate been set. 17739 * </p> 17740 * 17741 * @return The provider. 17742 * 17743 * @see AccessibilityNodeProvider 17744 */ 17745 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17746 return null; 17747 } 17748 } 17749} 17750