View.java revision 27e2da7c171afa39358bbead18fbe3e6b8ea6637
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()) { 4375 AccessibilityEvent event = AccessibilityEvent.obtain( 4376 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4377 event.getText().add(text); 4378 sendAccessibilityEventUnchecked(event); 4379 } 4380 } 4381 4382 /** 4383 * @see #sendAccessibilityEvent(int) 4384 * 4385 * Note: Called from the default {@link AccessibilityDelegate}. 4386 */ 4387 void sendAccessibilityEventInternal(int eventType) { 4388 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4389 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4390 } 4391 } 4392 4393 /** 4394 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4395 * takes as an argument an empty {@link AccessibilityEvent} and does not 4396 * perform a check whether accessibility is enabled. 4397 * <p> 4398 * If an {@link AccessibilityDelegate} has been specified via calling 4399 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4400 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4401 * is responsible for handling this call. 4402 * </p> 4403 * 4404 * @param event The event to send. 4405 * 4406 * @see #sendAccessibilityEvent(int) 4407 */ 4408 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4409 if (mAccessibilityDelegate != null) { 4410 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4411 } else { 4412 sendAccessibilityEventUncheckedInternal(event); 4413 } 4414 } 4415 4416 /** 4417 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4418 * 4419 * Note: Called from the default {@link AccessibilityDelegate}. 4420 */ 4421 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4422 if (!isShown()) { 4423 return; 4424 } 4425 onInitializeAccessibilityEvent(event); 4426 // Only a subset of accessibility events populates text content. 4427 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4428 dispatchPopulateAccessibilityEvent(event); 4429 } 4430 // In the beginning we called #isShown(), so we know that getParent() is not null. 4431 getParent().requestSendAccessibilityEvent(this, event); 4432 } 4433 4434 /** 4435 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4436 * to its children for adding their text content to the event. Note that the 4437 * event text is populated in a separate dispatch path since we add to the 4438 * event not only the text of the source but also the text of all its descendants. 4439 * A typical implementation will call 4440 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4441 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4442 * on each child. Override this method if custom population of the event text 4443 * content is required. 4444 * <p> 4445 * If an {@link AccessibilityDelegate} has been specified via calling 4446 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4447 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4448 * is responsible for handling this call. 4449 * </p> 4450 * <p> 4451 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4452 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4453 * </p> 4454 * 4455 * @param event The event. 4456 * 4457 * @return True if the event population was completed. 4458 */ 4459 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4460 if (mAccessibilityDelegate != null) { 4461 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4462 } else { 4463 return dispatchPopulateAccessibilityEventInternal(event); 4464 } 4465 } 4466 4467 /** 4468 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4469 * 4470 * Note: Called from the default {@link AccessibilityDelegate}. 4471 */ 4472 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4473 onPopulateAccessibilityEvent(event); 4474 return false; 4475 } 4476 4477 /** 4478 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4479 * giving a chance to this View to populate the accessibility event with its 4480 * text content. While this method is free to modify event 4481 * attributes other than text content, doing so should normally be performed in 4482 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4483 * <p> 4484 * Example: Adding formatted date string to an accessibility event in addition 4485 * to the text added by the super implementation: 4486 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4487 * super.onPopulateAccessibilityEvent(event); 4488 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4489 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4490 * mCurrentDate.getTimeInMillis(), flags); 4491 * event.getText().add(selectedDateUtterance); 4492 * }</pre> 4493 * <p> 4494 * If an {@link AccessibilityDelegate} has been specified via calling 4495 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4496 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4497 * is responsible for handling this call. 4498 * </p> 4499 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4500 * information to the event, in case the default implementation has basic information to add. 4501 * </p> 4502 * 4503 * @param event The accessibility event which to populate. 4504 * 4505 * @see #sendAccessibilityEvent(int) 4506 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4507 */ 4508 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4509 if (mAccessibilityDelegate != null) { 4510 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4511 } else { 4512 onPopulateAccessibilityEventInternal(event); 4513 } 4514 } 4515 4516 /** 4517 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4518 * 4519 * Note: Called from the default {@link AccessibilityDelegate}. 4520 */ 4521 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4522 4523 } 4524 4525 /** 4526 * Initializes an {@link AccessibilityEvent} with information about 4527 * this View which is the event source. In other words, the source of 4528 * an accessibility event is the view whose state change triggered firing 4529 * the event. 4530 * <p> 4531 * Example: Setting the password property of an event in addition 4532 * to properties set by the super implementation: 4533 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4534 * super.onInitializeAccessibilityEvent(event); 4535 * event.setPassword(true); 4536 * }</pre> 4537 * <p> 4538 * If an {@link AccessibilityDelegate} has been specified via calling 4539 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4540 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4541 * is responsible for handling this call. 4542 * </p> 4543 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4544 * information to the event, in case the default implementation has basic information to add. 4545 * </p> 4546 * @param event The event to initialize. 4547 * 4548 * @see #sendAccessibilityEvent(int) 4549 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4550 */ 4551 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4552 if (mAccessibilityDelegate != null) { 4553 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4554 } else { 4555 onInitializeAccessibilityEventInternal(event); 4556 } 4557 } 4558 4559 /** 4560 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4561 * 4562 * Note: Called from the default {@link AccessibilityDelegate}. 4563 */ 4564 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4565 event.setSource(this); 4566 event.setClassName(View.class.getName()); 4567 event.setPackageName(getContext().getPackageName()); 4568 event.setEnabled(isEnabled()); 4569 event.setContentDescription(mContentDescription); 4570 4571 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4572 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4573 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4574 FOCUSABLES_ALL); 4575 event.setItemCount(focusablesTempList.size()); 4576 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4577 focusablesTempList.clear(); 4578 } 4579 } 4580 4581 /** 4582 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4583 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4584 * This method is responsible for obtaining an accessibility node info from a 4585 * pool of reusable instances and calling 4586 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4587 * initialize the former. 4588 * <p> 4589 * Note: The client is responsible for recycling the obtained instance by calling 4590 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4591 * </p> 4592 * 4593 * @return A populated {@link AccessibilityNodeInfo}. 4594 * 4595 * @see AccessibilityNodeInfo 4596 */ 4597 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4598 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4599 if (provider != null) { 4600 return provider.createAccessibilityNodeInfo(View.NO_ID); 4601 } else { 4602 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4603 onInitializeAccessibilityNodeInfo(info); 4604 return info; 4605 } 4606 } 4607 4608 /** 4609 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4610 * The base implementation sets: 4611 * <ul> 4612 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4613 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4614 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4615 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4616 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4617 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4618 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4619 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4620 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4621 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4622 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4623 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4624 * </ul> 4625 * <p> 4626 * Subclasses should override this method, call the super implementation, 4627 * and set additional attributes. 4628 * </p> 4629 * <p> 4630 * If an {@link AccessibilityDelegate} has been specified via calling 4631 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4632 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4633 * is responsible for handling this call. 4634 * </p> 4635 * 4636 * @param info The instance to initialize. 4637 */ 4638 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4639 if (mAccessibilityDelegate != null) { 4640 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4641 } else { 4642 onInitializeAccessibilityNodeInfoInternal(info); 4643 } 4644 } 4645 4646 /** 4647 * Gets the location of this view in screen coordintates. 4648 * 4649 * @param outRect The output location 4650 */ 4651 private void getBoundsOnScreen(Rect outRect) { 4652 if (mAttachInfo == null) { 4653 return; 4654 } 4655 4656 RectF position = mAttachInfo.mTmpTransformRect; 4657 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4658 4659 if (!hasIdentityMatrix()) { 4660 getMatrix().mapRect(position); 4661 } 4662 4663 position.offset(mLeft, mTop); 4664 4665 ViewParent parent = mParent; 4666 while (parent instanceof View) { 4667 View parentView = (View) parent; 4668 4669 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4670 4671 if (!parentView.hasIdentityMatrix()) { 4672 parentView.getMatrix().mapRect(position); 4673 } 4674 4675 position.offset(parentView.mLeft, parentView.mTop); 4676 4677 parent = parentView.mParent; 4678 } 4679 4680 if (parent instanceof ViewRootImpl) { 4681 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4682 position.offset(0, -viewRootImpl.mCurScrollY); 4683 } 4684 4685 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4686 4687 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4688 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4689 } 4690 4691 /** 4692 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4693 * 4694 * Note: Called from the default {@link AccessibilityDelegate}. 4695 */ 4696 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4697 Rect bounds = mAttachInfo.mTmpInvalRect; 4698 getDrawingRect(bounds); 4699 info.setBoundsInParent(bounds); 4700 4701 getBoundsOnScreen(bounds); 4702 info.setBoundsInScreen(bounds); 4703 4704 ViewParent parent = getParentForAccessibility(); 4705 if (parent instanceof View) { 4706 info.setParent((View) parent); 4707 } 4708 4709 info.setVisibleToUser(isVisibleToUser()); 4710 4711 info.setPackageName(mContext.getPackageName()); 4712 info.setClassName(View.class.getName()); 4713 info.setContentDescription(getContentDescription()); 4714 4715 info.setEnabled(isEnabled()); 4716 info.setClickable(isClickable()); 4717 info.setFocusable(isFocusable()); 4718 info.setFocused(isFocused()); 4719 info.setAccessibilityFocused(isAccessibilityFocused()); 4720 info.setSelected(isSelected()); 4721 info.setLongClickable(isLongClickable()); 4722 4723 // TODO: These make sense only if we are in an AdapterView but all 4724 // views can be selected. Maybe from accessiiblity perspective 4725 // we should report as selectable view in an AdapterView. 4726 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4727 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4728 4729 if (isFocusable()) { 4730 if (isFocused()) { 4731 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4732 } else { 4733 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4734 } 4735 } 4736 4737 if (!isAccessibilityFocused()) { 4738 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4739 } else { 4740 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4741 } 4742 4743 if (isClickable() && isEnabled()) { 4744 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4745 } 4746 4747 if (isLongClickable() && isEnabled()) { 4748 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4749 } 4750 4751 if (mContentDescription != null && mContentDescription.length() > 0) { 4752 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4753 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4754 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4755 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4756 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4757 } 4758 } 4759 4760 /** 4761 * Returns the delta between the actual and last reported window left. 4762 * 4763 * @hide 4764 */ 4765 public int getActualAndReportedWindowLeftDelta() { 4766 if (mAttachInfo != null) { 4767 return mAttachInfo.mActualWindowLeft - mAttachInfo.mWindowLeft; 4768 } 4769 return 0; 4770 } 4771 4772 /** 4773 * Returns the delta between the actual and last reported window top. 4774 * 4775 * @hide 4776 */ 4777 public int getActualAndReportedWindowTopDelta() { 4778 if (mAttachInfo != null) { 4779 return mAttachInfo.mActualWindowTop - mAttachInfo.mWindowTop; 4780 } 4781 return 0; 4782 } 4783 4784 /** 4785 * Computes whether this view is visible to the user. Such a view is 4786 * attached, visible, all its predecessors are visible, it is not clipped 4787 * entirely by its predecessors, and has an alpha greater than zero. 4788 * 4789 * @return Whether the view is visible on the screen. 4790 * 4791 * @hide 4792 */ 4793 protected boolean isVisibleToUser() { 4794 return isVisibleToUser(null); 4795 } 4796 4797 /** 4798 * Computes whether the given portion of this view is visible to the user. Such a view is 4799 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4800 * the specified portion is not clipped entirely by its predecessors. 4801 * 4802 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4803 * <code>null</code>, and the entire view will be tested in this case. 4804 * When <code>true</code> is returned by the function, the actual visible 4805 * region will be stored in this parameter; that is, if boundInView is fully 4806 * contained within the view, no modification will be made, otherwise regions 4807 * outside of the visible area of the view will be clipped. 4808 * 4809 * @return Whether the specified portion of the view is visible on the screen. 4810 * 4811 * @hide 4812 */ 4813 protected boolean isVisibleToUser(Rect boundInView) { 4814 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4815 Point offset = mAttachInfo.mPoint; 4816 // The first two checks are made also made by isShown() which 4817 // however traverses the tree up to the parent to catch that. 4818 // Therefore, we do some fail fast check to minimize the up 4819 // tree traversal. 4820 boolean isVisible = mAttachInfo != null 4821 && mAttachInfo.mWindowVisibility == View.VISIBLE 4822 && getAlpha() > 0 4823 && isShown() 4824 && getGlobalVisibleRect(visibleRect, offset); 4825 if (isVisible && boundInView != null) { 4826 visibleRect.offset(-offset.x, -offset.y); 4827 isVisible &= boundInView.intersect(visibleRect); 4828 } 4829 return isVisible; 4830 } 4831 4832 /** 4833 * Sets a delegate for implementing accessibility support via compositon as 4834 * opposed to inheritance. The delegate's primary use is for implementing 4835 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4836 * 4837 * @param delegate The delegate instance. 4838 * 4839 * @see AccessibilityDelegate 4840 */ 4841 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4842 mAccessibilityDelegate = delegate; 4843 } 4844 4845 /** 4846 * Gets the provider for managing a virtual view hierarchy rooted at this View 4847 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4848 * that explore the window content. 4849 * <p> 4850 * If this method returns an instance, this instance is responsible for managing 4851 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4852 * View including the one representing the View itself. Similarly the returned 4853 * instance is responsible for performing accessibility actions on any virtual 4854 * view or the root view itself. 4855 * </p> 4856 * <p> 4857 * If an {@link AccessibilityDelegate} has been specified via calling 4858 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4859 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4860 * is responsible for handling this call. 4861 * </p> 4862 * 4863 * @return The provider. 4864 * 4865 * @see AccessibilityNodeProvider 4866 */ 4867 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4868 if (mAccessibilityDelegate != null) { 4869 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4870 } else { 4871 return null; 4872 } 4873 } 4874 4875 /** 4876 * Gets the unique identifier of this view on the screen for accessibility purposes. 4877 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4878 * 4879 * @return The view accessibility id. 4880 * 4881 * @hide 4882 */ 4883 public int getAccessibilityViewId() { 4884 if (mAccessibilityViewId == NO_ID) { 4885 mAccessibilityViewId = sNextAccessibilityViewId++; 4886 } 4887 return mAccessibilityViewId; 4888 } 4889 4890 /** 4891 * Gets the unique identifier of the window in which this View reseides. 4892 * 4893 * @return The window accessibility id. 4894 * 4895 * @hide 4896 */ 4897 public int getAccessibilityWindowId() { 4898 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4899 } 4900 4901 /** 4902 * Gets the {@link View} description. It briefly describes the view and is 4903 * primarily used for accessibility support. Set this property to enable 4904 * better accessibility support for your application. This is especially 4905 * true for views that do not have textual representation (For example, 4906 * ImageButton). 4907 * 4908 * @return The content description. 4909 * 4910 * @attr ref android.R.styleable#View_contentDescription 4911 */ 4912 @ViewDebug.ExportedProperty(category = "accessibility") 4913 public CharSequence getContentDescription() { 4914 return mContentDescription; 4915 } 4916 4917 /** 4918 * Sets the {@link View} description. It briefly describes the view and is 4919 * primarily used for accessibility support. Set this property to enable 4920 * better accessibility support for your application. This is especially 4921 * true for views that do not have textual representation (For example, 4922 * ImageButton). 4923 * 4924 * @param contentDescription The content description. 4925 * 4926 * @attr ref android.R.styleable#View_contentDescription 4927 */ 4928 @RemotableViewMethod 4929 public void setContentDescription(CharSequence contentDescription) { 4930 mContentDescription = contentDescription; 4931 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 4932 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 4933 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 4934 } 4935 } 4936 4937 /** 4938 * Invoked whenever this view loses focus, either by losing window focus or by losing 4939 * focus within its window. This method can be used to clear any state tied to the 4940 * focus. For instance, if a button is held pressed with the trackball and the window 4941 * loses focus, this method can be used to cancel the press. 4942 * 4943 * Subclasses of View overriding this method should always call super.onFocusLost(). 4944 * 4945 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4946 * @see #onWindowFocusChanged(boolean) 4947 * 4948 * @hide pending API council approval 4949 */ 4950 protected void onFocusLost() { 4951 resetPressedState(); 4952 } 4953 4954 private void resetPressedState() { 4955 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4956 return; 4957 } 4958 4959 if (isPressed()) { 4960 setPressed(false); 4961 4962 if (!mHasPerformedLongPress) { 4963 removeLongPressCallback(); 4964 } 4965 } 4966 } 4967 4968 /** 4969 * Returns true if this view has focus 4970 * 4971 * @return True if this view has focus, false otherwise. 4972 */ 4973 @ViewDebug.ExportedProperty(category = "focus") 4974 public boolean isFocused() { 4975 return (mPrivateFlags & FOCUSED) != 0; 4976 } 4977 4978 /** 4979 * Find the view in the hierarchy rooted at this view that currently has 4980 * focus. 4981 * 4982 * @return The view that currently has focus, or null if no focused view can 4983 * be found. 4984 */ 4985 public View findFocus() { 4986 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4987 } 4988 4989 /** 4990 * Indicates whether this view is one of the set of scrollable containers in 4991 * its window. 4992 * 4993 * @return whether this view is one of the set of scrollable containers in 4994 * its window 4995 * 4996 * @attr ref android.R.styleable#View_isScrollContainer 4997 */ 4998 public boolean isScrollContainer() { 4999 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5000 } 5001 5002 /** 5003 * Change whether this view is one of the set of scrollable containers in 5004 * its window. This will be used to determine whether the window can 5005 * resize or must pan when a soft input area is open -- scrollable 5006 * containers allow the window to use resize mode since the container 5007 * will appropriately shrink. 5008 * 5009 * @attr ref android.R.styleable#View_isScrollContainer 5010 */ 5011 public void setScrollContainer(boolean isScrollContainer) { 5012 if (isScrollContainer) { 5013 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5014 mAttachInfo.mScrollContainers.add(this); 5015 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5016 } 5017 mPrivateFlags |= SCROLL_CONTAINER; 5018 } else { 5019 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5020 mAttachInfo.mScrollContainers.remove(this); 5021 } 5022 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5023 } 5024 } 5025 5026 /** 5027 * Returns the quality of the drawing cache. 5028 * 5029 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5030 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5031 * 5032 * @see #setDrawingCacheQuality(int) 5033 * @see #setDrawingCacheEnabled(boolean) 5034 * @see #isDrawingCacheEnabled() 5035 * 5036 * @attr ref android.R.styleable#View_drawingCacheQuality 5037 */ 5038 public int getDrawingCacheQuality() { 5039 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5040 } 5041 5042 /** 5043 * Set the drawing cache quality of this view. This value is used only when the 5044 * drawing cache is enabled 5045 * 5046 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5047 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5048 * 5049 * @see #getDrawingCacheQuality() 5050 * @see #setDrawingCacheEnabled(boolean) 5051 * @see #isDrawingCacheEnabled() 5052 * 5053 * @attr ref android.R.styleable#View_drawingCacheQuality 5054 */ 5055 public void setDrawingCacheQuality(int quality) { 5056 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5057 } 5058 5059 /** 5060 * Returns whether the screen should remain on, corresponding to the current 5061 * value of {@link #KEEP_SCREEN_ON}. 5062 * 5063 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5064 * 5065 * @see #setKeepScreenOn(boolean) 5066 * 5067 * @attr ref android.R.styleable#View_keepScreenOn 5068 */ 5069 public boolean getKeepScreenOn() { 5070 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5071 } 5072 5073 /** 5074 * Controls whether the screen should remain on, modifying the 5075 * value of {@link #KEEP_SCREEN_ON}. 5076 * 5077 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5078 * 5079 * @see #getKeepScreenOn() 5080 * 5081 * @attr ref android.R.styleable#View_keepScreenOn 5082 */ 5083 public void setKeepScreenOn(boolean keepScreenOn) { 5084 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5085 } 5086 5087 /** 5088 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5089 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5090 * 5091 * @attr ref android.R.styleable#View_nextFocusLeft 5092 */ 5093 public int getNextFocusLeftId() { 5094 return mNextFocusLeftId; 5095 } 5096 5097 /** 5098 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5099 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5100 * decide automatically. 5101 * 5102 * @attr ref android.R.styleable#View_nextFocusLeft 5103 */ 5104 public void setNextFocusLeftId(int nextFocusLeftId) { 5105 mNextFocusLeftId = nextFocusLeftId; 5106 } 5107 5108 /** 5109 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5110 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5111 * 5112 * @attr ref android.R.styleable#View_nextFocusRight 5113 */ 5114 public int getNextFocusRightId() { 5115 return mNextFocusRightId; 5116 } 5117 5118 /** 5119 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5120 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5121 * decide automatically. 5122 * 5123 * @attr ref android.R.styleable#View_nextFocusRight 5124 */ 5125 public void setNextFocusRightId(int nextFocusRightId) { 5126 mNextFocusRightId = nextFocusRightId; 5127 } 5128 5129 /** 5130 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5131 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5132 * 5133 * @attr ref android.R.styleable#View_nextFocusUp 5134 */ 5135 public int getNextFocusUpId() { 5136 return mNextFocusUpId; 5137 } 5138 5139 /** 5140 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5141 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5142 * decide automatically. 5143 * 5144 * @attr ref android.R.styleable#View_nextFocusUp 5145 */ 5146 public void setNextFocusUpId(int nextFocusUpId) { 5147 mNextFocusUpId = nextFocusUpId; 5148 } 5149 5150 /** 5151 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5152 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5153 * 5154 * @attr ref android.R.styleable#View_nextFocusDown 5155 */ 5156 public int getNextFocusDownId() { 5157 return mNextFocusDownId; 5158 } 5159 5160 /** 5161 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5162 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5163 * decide automatically. 5164 * 5165 * @attr ref android.R.styleable#View_nextFocusDown 5166 */ 5167 public void setNextFocusDownId(int nextFocusDownId) { 5168 mNextFocusDownId = nextFocusDownId; 5169 } 5170 5171 /** 5172 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5173 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5174 * 5175 * @attr ref android.R.styleable#View_nextFocusForward 5176 */ 5177 public int getNextFocusForwardId() { 5178 return mNextFocusForwardId; 5179 } 5180 5181 /** 5182 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5183 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5184 * decide automatically. 5185 * 5186 * @attr ref android.R.styleable#View_nextFocusForward 5187 */ 5188 public void setNextFocusForwardId(int nextFocusForwardId) { 5189 mNextFocusForwardId = nextFocusForwardId; 5190 } 5191 5192 /** 5193 * Returns the visibility of this view and all of its ancestors 5194 * 5195 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5196 */ 5197 public boolean isShown() { 5198 View current = this; 5199 //noinspection ConstantConditions 5200 do { 5201 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5202 return false; 5203 } 5204 ViewParent parent = current.mParent; 5205 if (parent == null) { 5206 return false; // We are not attached to the view root 5207 } 5208 if (!(parent instanceof View)) { 5209 return true; 5210 } 5211 current = (View) parent; 5212 } while (current != null); 5213 5214 return false; 5215 } 5216 5217 /** 5218 * Called by the view hierarchy when the content insets for a window have 5219 * changed, to allow it to adjust its content to fit within those windows. 5220 * The content insets tell you the space that the status bar, input method, 5221 * and other system windows infringe on the application's window. 5222 * 5223 * <p>You do not normally need to deal with this function, since the default 5224 * window decoration given to applications takes care of applying it to the 5225 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5226 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5227 * and your content can be placed under those system elements. You can then 5228 * use this method within your view hierarchy if you have parts of your UI 5229 * which you would like to ensure are not being covered. 5230 * 5231 * <p>The default implementation of this method simply applies the content 5232 * inset's to the view's padding, consuming that content (modifying the 5233 * insets to be 0), and returning true. This behavior is off by default, but can 5234 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5235 * 5236 * <p>This function's traversal down the hierarchy is depth-first. The same content 5237 * insets object is propagated down the hierarchy, so any changes made to it will 5238 * be seen by all following views (including potentially ones above in 5239 * the hierarchy since this is a depth-first traversal). The first view 5240 * that returns true will abort the entire traversal. 5241 * 5242 * <p>The default implementation works well for a situation where it is 5243 * used with a container that covers the entire window, allowing it to 5244 * apply the appropriate insets to its content on all edges. If you need 5245 * a more complicated layout (such as two different views fitting system 5246 * windows, one on the top of the window, and one on the bottom), 5247 * you can override the method and handle the insets however you would like. 5248 * Note that the insets provided by the framework are always relative to the 5249 * far edges of the window, not accounting for the location of the called view 5250 * within that window. (In fact when this method is called you do not yet know 5251 * where the layout will place the view, as it is done before layout happens.) 5252 * 5253 * <p>Note: unlike many View methods, there is no dispatch phase to this 5254 * call. If you are overriding it in a ViewGroup and want to allow the 5255 * call to continue to your children, you must be sure to call the super 5256 * implementation. 5257 * 5258 * <p>Here is a sample layout that makes use of fitting system windows 5259 * to have controls for a video view placed inside of the window decorations 5260 * that it hides and shows. This can be used with code like the second 5261 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5262 * 5263 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5264 * 5265 * @param insets Current content insets of the window. Prior to 5266 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5267 * the insets or else you and Android will be unhappy. 5268 * 5269 * @return Return true if this view applied the insets and it should not 5270 * continue propagating further down the hierarchy, false otherwise. 5271 * @see #getFitsSystemWindows() 5272 * @see #setFitsSystemWindows() 5273 * @see #setSystemUiVisibility(int) 5274 */ 5275 protected boolean fitSystemWindows(Rect insets) { 5276 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5277 mUserPaddingStart = -1; 5278 mUserPaddingEnd = -1; 5279 mUserPaddingRelative = false; 5280 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5281 || mAttachInfo == null 5282 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5283 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5284 return true; 5285 } else { 5286 internalSetPadding(0, 0, 0, 0); 5287 return false; 5288 } 5289 } 5290 return false; 5291 } 5292 5293 /** 5294 * Sets whether or not this view should account for system screen decorations 5295 * such as the status bar and inset its content; that is, controlling whether 5296 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5297 * executed. See that method for more details. 5298 * 5299 * <p>Note that if you are providing your own implementation of 5300 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5301 * flag to true -- your implementation will be overriding the default 5302 * implementation that checks this flag. 5303 * 5304 * @param fitSystemWindows If true, then the default implementation of 5305 * {@link #fitSystemWindows(Rect)} will be executed. 5306 * 5307 * @attr ref android.R.styleable#View_fitsSystemWindows 5308 * @see #getFitsSystemWindows() 5309 * @see #fitSystemWindows(Rect) 5310 * @see #setSystemUiVisibility(int) 5311 */ 5312 public void setFitsSystemWindows(boolean fitSystemWindows) { 5313 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5314 } 5315 5316 /** 5317 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5318 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5319 * will be executed. 5320 * 5321 * @return Returns true if the default implementation of 5322 * {@link #fitSystemWindows(Rect)} will be executed. 5323 * 5324 * @attr ref android.R.styleable#View_fitsSystemWindows 5325 * @see #setFitsSystemWindows() 5326 * @see #fitSystemWindows(Rect) 5327 * @see #setSystemUiVisibility(int) 5328 */ 5329 public boolean getFitsSystemWindows() { 5330 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5331 } 5332 5333 /** @hide */ 5334 public boolean fitsSystemWindows() { 5335 return getFitsSystemWindows(); 5336 } 5337 5338 /** 5339 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5340 */ 5341 public void requestFitSystemWindows() { 5342 if (mParent != null) { 5343 mParent.requestFitSystemWindows(); 5344 } 5345 } 5346 5347 /** 5348 * For use by PhoneWindow to make its own system window fitting optional. 5349 * @hide 5350 */ 5351 public void makeOptionalFitsSystemWindows() { 5352 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5353 } 5354 5355 /** 5356 * Returns the visibility status for this view. 5357 * 5358 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5359 * @attr ref android.R.styleable#View_visibility 5360 */ 5361 @ViewDebug.ExportedProperty(mapping = { 5362 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5363 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5364 @ViewDebug.IntToString(from = GONE, to = "GONE") 5365 }) 5366 public int getVisibility() { 5367 return mViewFlags & VISIBILITY_MASK; 5368 } 5369 5370 /** 5371 * Set the enabled state of this view. 5372 * 5373 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5374 * @attr ref android.R.styleable#View_visibility 5375 */ 5376 @RemotableViewMethod 5377 public void setVisibility(int visibility) { 5378 setFlags(visibility, VISIBILITY_MASK); 5379 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5380 } 5381 5382 /** 5383 * Returns the enabled status for this view. The interpretation of the 5384 * enabled state varies by subclass. 5385 * 5386 * @return True if this view is enabled, false otherwise. 5387 */ 5388 @ViewDebug.ExportedProperty 5389 public boolean isEnabled() { 5390 return (mViewFlags & ENABLED_MASK) == ENABLED; 5391 } 5392 5393 /** 5394 * Set the enabled state of this view. The interpretation of the enabled 5395 * state varies by subclass. 5396 * 5397 * @param enabled True if this view is enabled, false otherwise. 5398 */ 5399 @RemotableViewMethod 5400 public void setEnabled(boolean enabled) { 5401 if (enabled == isEnabled()) return; 5402 5403 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5404 5405 /* 5406 * The View most likely has to change its appearance, so refresh 5407 * the drawable state. 5408 */ 5409 refreshDrawableState(); 5410 5411 // Invalidate too, since the default behavior for views is to be 5412 // be drawn at 50% alpha rather than to change the drawable. 5413 invalidate(true); 5414 } 5415 5416 /** 5417 * Set whether this view can receive the focus. 5418 * 5419 * Setting this to false will also ensure that this view is not focusable 5420 * in touch mode. 5421 * 5422 * @param focusable If true, this view can receive the focus. 5423 * 5424 * @see #setFocusableInTouchMode(boolean) 5425 * @attr ref android.R.styleable#View_focusable 5426 */ 5427 public void setFocusable(boolean focusable) { 5428 if (!focusable) { 5429 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5430 } 5431 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5432 } 5433 5434 /** 5435 * Set whether this view can receive focus while in touch mode. 5436 * 5437 * Setting this to true will also ensure that this view is focusable. 5438 * 5439 * @param focusableInTouchMode If true, this view can receive the focus while 5440 * in touch mode. 5441 * 5442 * @see #setFocusable(boolean) 5443 * @attr ref android.R.styleable#View_focusableInTouchMode 5444 */ 5445 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5446 // Focusable in touch mode should always be set before the focusable flag 5447 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5448 // which, in touch mode, will not successfully request focus on this view 5449 // because the focusable in touch mode flag is not set 5450 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5451 if (focusableInTouchMode) { 5452 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5453 } 5454 } 5455 5456 /** 5457 * Set whether this view should have sound effects enabled for events such as 5458 * clicking and touching. 5459 * 5460 * <p>You may wish to disable sound effects for a view if you already play sounds, 5461 * for instance, a dial key that plays dtmf tones. 5462 * 5463 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5464 * @see #isSoundEffectsEnabled() 5465 * @see #playSoundEffect(int) 5466 * @attr ref android.R.styleable#View_soundEffectsEnabled 5467 */ 5468 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5469 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5470 } 5471 5472 /** 5473 * @return whether this view should have sound effects enabled for events such as 5474 * clicking and touching. 5475 * 5476 * @see #setSoundEffectsEnabled(boolean) 5477 * @see #playSoundEffect(int) 5478 * @attr ref android.R.styleable#View_soundEffectsEnabled 5479 */ 5480 @ViewDebug.ExportedProperty 5481 public boolean isSoundEffectsEnabled() { 5482 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5483 } 5484 5485 /** 5486 * Set whether this view should have haptic feedback for events such as 5487 * long presses. 5488 * 5489 * <p>You may wish to disable haptic feedback if your view already controls 5490 * its own haptic feedback. 5491 * 5492 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5493 * @see #isHapticFeedbackEnabled() 5494 * @see #performHapticFeedback(int) 5495 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5496 */ 5497 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5498 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5499 } 5500 5501 /** 5502 * @return whether this view should have haptic feedback enabled for events 5503 * long presses. 5504 * 5505 * @see #setHapticFeedbackEnabled(boolean) 5506 * @see #performHapticFeedback(int) 5507 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5508 */ 5509 @ViewDebug.ExportedProperty 5510 public boolean isHapticFeedbackEnabled() { 5511 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5512 } 5513 5514 /** 5515 * Returns the layout direction for this view. 5516 * 5517 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5518 * {@link #LAYOUT_DIRECTION_RTL}, 5519 * {@link #LAYOUT_DIRECTION_INHERIT} or 5520 * {@link #LAYOUT_DIRECTION_LOCALE}. 5521 * @attr ref android.R.styleable#View_layoutDirection 5522 */ 5523 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5524 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5525 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5526 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5527 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5528 }) 5529 public int getLayoutDirection() { 5530 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5531 } 5532 5533 /** 5534 * Set the layout direction for this view. This will propagate a reset of layout direction 5535 * resolution to the view's children and resolve layout direction for this view. 5536 * 5537 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5538 * {@link #LAYOUT_DIRECTION_RTL}, 5539 * {@link #LAYOUT_DIRECTION_INHERIT} or 5540 * {@link #LAYOUT_DIRECTION_LOCALE}. 5541 * 5542 * @attr ref android.R.styleable#View_layoutDirection 5543 */ 5544 @RemotableViewMethod 5545 public void setLayoutDirection(int layoutDirection) { 5546 if (getLayoutDirection() != layoutDirection) { 5547 // Reset the current layout direction and the resolved one 5548 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5549 resetResolvedLayoutDirection(); 5550 // Set the new layout direction (filtered) and ask for a layout pass 5551 mPrivateFlags2 |= 5552 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5553 requestLayout(); 5554 } 5555 } 5556 5557 /** 5558 * Returns the resolved layout direction for this view. 5559 * 5560 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5561 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5562 */ 5563 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5564 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5565 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5566 }) 5567 public int getResolvedLayoutDirection() { 5568 // The layout diretion will be resolved only if needed 5569 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5570 resolveLayoutDirection(); 5571 } 5572 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5573 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5574 } 5575 5576 /** 5577 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5578 * layout attribute and/or the inherited value from the parent 5579 * 5580 * @return true if the layout is right-to-left. 5581 */ 5582 @ViewDebug.ExportedProperty(category = "layout") 5583 public boolean isLayoutRtl() { 5584 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5585 } 5586 5587 /** 5588 * Indicates whether the view is currently tracking transient state that the 5589 * app should not need to concern itself with saving and restoring, but that 5590 * the framework should take special note to preserve when possible. 5591 * 5592 * <p>A view with transient state cannot be trivially rebound from an external 5593 * data source, such as an adapter binding item views in a list. This may be 5594 * because the view is performing an animation, tracking user selection 5595 * of content, or similar.</p> 5596 * 5597 * @return true if the view has transient state 5598 */ 5599 @ViewDebug.ExportedProperty(category = "layout") 5600 public boolean hasTransientState() { 5601 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5602 } 5603 5604 /** 5605 * Set whether this view is currently tracking transient state that the 5606 * framework should attempt to preserve when possible. This flag is reference counted, 5607 * so every call to setHasTransientState(true) should be paired with a later call 5608 * to setHasTransientState(false). 5609 * 5610 * <p>A view with transient state cannot be trivially rebound from an external 5611 * data source, such as an adapter binding item views in a list. This may be 5612 * because the view is performing an animation, tracking user selection 5613 * of content, or similar.</p> 5614 * 5615 * @param hasTransientState true if this view has transient state 5616 */ 5617 public void setHasTransientState(boolean hasTransientState) { 5618 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5619 mTransientStateCount - 1; 5620 if (mTransientStateCount < 0) { 5621 mTransientStateCount = 0; 5622 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5623 "unmatched pair of setHasTransientState calls"); 5624 } 5625 if ((hasTransientState && mTransientStateCount == 1) || 5626 (!hasTransientState && mTransientStateCount == 0)) { 5627 // update flag if we've just incremented up from 0 or decremented down to 0 5628 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5629 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5630 if (mParent != null) { 5631 try { 5632 mParent.childHasTransientStateChanged(this, hasTransientState); 5633 } catch (AbstractMethodError e) { 5634 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5635 " does not fully implement ViewParent", e); 5636 } 5637 } 5638 } 5639 } 5640 5641 /** 5642 * If this view doesn't do any drawing on its own, set this flag to 5643 * allow further optimizations. By default, this flag is not set on 5644 * View, but could be set on some View subclasses such as ViewGroup. 5645 * 5646 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5647 * you should clear this flag. 5648 * 5649 * @param willNotDraw whether or not this View draw on its own 5650 */ 5651 public void setWillNotDraw(boolean willNotDraw) { 5652 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5653 } 5654 5655 /** 5656 * Returns whether or not this View draws on its own. 5657 * 5658 * @return true if this view has nothing to draw, false otherwise 5659 */ 5660 @ViewDebug.ExportedProperty(category = "drawing") 5661 public boolean willNotDraw() { 5662 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5663 } 5664 5665 /** 5666 * When a View's drawing cache is enabled, drawing is redirected to an 5667 * offscreen bitmap. Some views, like an ImageView, must be able to 5668 * bypass this mechanism if they already draw a single bitmap, to avoid 5669 * unnecessary usage of the memory. 5670 * 5671 * @param willNotCacheDrawing true if this view does not cache its 5672 * drawing, false otherwise 5673 */ 5674 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5675 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5676 } 5677 5678 /** 5679 * Returns whether or not this View can cache its drawing or not. 5680 * 5681 * @return true if this view does not cache its drawing, false otherwise 5682 */ 5683 @ViewDebug.ExportedProperty(category = "drawing") 5684 public boolean willNotCacheDrawing() { 5685 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5686 } 5687 5688 /** 5689 * Indicates whether this view reacts to click events or not. 5690 * 5691 * @return true if the view is clickable, false otherwise 5692 * 5693 * @see #setClickable(boolean) 5694 * @attr ref android.R.styleable#View_clickable 5695 */ 5696 @ViewDebug.ExportedProperty 5697 public boolean isClickable() { 5698 return (mViewFlags & CLICKABLE) == CLICKABLE; 5699 } 5700 5701 /** 5702 * Enables or disables click events for this view. When a view 5703 * is clickable it will change its state to "pressed" on every click. 5704 * Subclasses should set the view clickable to visually react to 5705 * user's clicks. 5706 * 5707 * @param clickable true to make the view clickable, false otherwise 5708 * 5709 * @see #isClickable() 5710 * @attr ref android.R.styleable#View_clickable 5711 */ 5712 public void setClickable(boolean clickable) { 5713 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5714 } 5715 5716 /** 5717 * Indicates whether this view reacts to long click events or not. 5718 * 5719 * @return true if the view is long clickable, false otherwise 5720 * 5721 * @see #setLongClickable(boolean) 5722 * @attr ref android.R.styleable#View_longClickable 5723 */ 5724 public boolean isLongClickable() { 5725 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5726 } 5727 5728 /** 5729 * Enables or disables long click events for this view. When a view is long 5730 * clickable it reacts to the user holding down the button for a longer 5731 * duration than a tap. This event can either launch the listener or a 5732 * context menu. 5733 * 5734 * @param longClickable true to make the view long clickable, false otherwise 5735 * @see #isLongClickable() 5736 * @attr ref android.R.styleable#View_longClickable 5737 */ 5738 public void setLongClickable(boolean longClickable) { 5739 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5740 } 5741 5742 /** 5743 * Sets the pressed state for this view. 5744 * 5745 * @see #isClickable() 5746 * @see #setClickable(boolean) 5747 * 5748 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5749 * the View's internal state from a previously set "pressed" state. 5750 */ 5751 public void setPressed(boolean pressed) { 5752 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5753 5754 if (pressed) { 5755 mPrivateFlags |= PRESSED; 5756 } else { 5757 mPrivateFlags &= ~PRESSED; 5758 } 5759 5760 if (needsRefresh) { 5761 refreshDrawableState(); 5762 } 5763 dispatchSetPressed(pressed); 5764 } 5765 5766 /** 5767 * Dispatch setPressed to all of this View's children. 5768 * 5769 * @see #setPressed(boolean) 5770 * 5771 * @param pressed The new pressed state 5772 */ 5773 protected void dispatchSetPressed(boolean pressed) { 5774 } 5775 5776 /** 5777 * Indicates whether the view is currently in pressed state. Unless 5778 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5779 * the pressed state. 5780 * 5781 * @see #setPressed(boolean) 5782 * @see #isClickable() 5783 * @see #setClickable(boolean) 5784 * 5785 * @return true if the view is currently pressed, false otherwise 5786 */ 5787 public boolean isPressed() { 5788 return (mPrivateFlags & PRESSED) == PRESSED; 5789 } 5790 5791 /** 5792 * Indicates whether this view will save its state (that is, 5793 * whether its {@link #onSaveInstanceState} method will be called). 5794 * 5795 * @return Returns true if the view state saving is enabled, else false. 5796 * 5797 * @see #setSaveEnabled(boolean) 5798 * @attr ref android.R.styleable#View_saveEnabled 5799 */ 5800 public boolean isSaveEnabled() { 5801 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5802 } 5803 5804 /** 5805 * Controls whether the saving of this view's state is 5806 * enabled (that is, whether its {@link #onSaveInstanceState} method 5807 * will be called). Note that even if freezing is enabled, the 5808 * view still must have an id assigned to it (via {@link #setId(int)}) 5809 * for its state to be saved. This flag can only disable the 5810 * saving of this view; any child views may still have their state saved. 5811 * 5812 * @param enabled Set to false to <em>disable</em> state saving, or true 5813 * (the default) to allow it. 5814 * 5815 * @see #isSaveEnabled() 5816 * @see #setId(int) 5817 * @see #onSaveInstanceState() 5818 * @attr ref android.R.styleable#View_saveEnabled 5819 */ 5820 public void setSaveEnabled(boolean enabled) { 5821 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5822 } 5823 5824 /** 5825 * Gets whether the framework should discard touches when the view's 5826 * window is obscured by another visible window. 5827 * Refer to the {@link View} security documentation for more details. 5828 * 5829 * @return True if touch filtering is enabled. 5830 * 5831 * @see #setFilterTouchesWhenObscured(boolean) 5832 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5833 */ 5834 @ViewDebug.ExportedProperty 5835 public boolean getFilterTouchesWhenObscured() { 5836 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5837 } 5838 5839 /** 5840 * Sets whether the framework should discard touches when the view's 5841 * window is obscured by another visible window. 5842 * Refer to the {@link View} security documentation for more details. 5843 * 5844 * @param enabled True if touch filtering should be enabled. 5845 * 5846 * @see #getFilterTouchesWhenObscured 5847 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5848 */ 5849 public void setFilterTouchesWhenObscured(boolean enabled) { 5850 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5851 FILTER_TOUCHES_WHEN_OBSCURED); 5852 } 5853 5854 /** 5855 * Indicates whether the entire hierarchy under this view will save its 5856 * state when a state saving traversal occurs from its parent. The default 5857 * is true; if false, these views will not be saved unless 5858 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5859 * 5860 * @return Returns true if the view state saving from parent is enabled, else false. 5861 * 5862 * @see #setSaveFromParentEnabled(boolean) 5863 */ 5864 public boolean isSaveFromParentEnabled() { 5865 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5866 } 5867 5868 /** 5869 * Controls whether the entire hierarchy under this view will save its 5870 * state when a state saving traversal occurs from its parent. The default 5871 * is true; if false, these views will not be saved unless 5872 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5873 * 5874 * @param enabled Set to false to <em>disable</em> state saving, or true 5875 * (the default) to allow it. 5876 * 5877 * @see #isSaveFromParentEnabled() 5878 * @see #setId(int) 5879 * @see #onSaveInstanceState() 5880 */ 5881 public void setSaveFromParentEnabled(boolean enabled) { 5882 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5883 } 5884 5885 5886 /** 5887 * Returns whether this View is able to take focus. 5888 * 5889 * @return True if this view can take focus, or false otherwise. 5890 * @attr ref android.R.styleable#View_focusable 5891 */ 5892 @ViewDebug.ExportedProperty(category = "focus") 5893 public final boolean isFocusable() { 5894 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5895 } 5896 5897 /** 5898 * When a view is focusable, it may not want to take focus when in touch mode. 5899 * For example, a button would like focus when the user is navigating via a D-pad 5900 * so that the user can click on it, but once the user starts touching the screen, 5901 * the button shouldn't take focus 5902 * @return Whether the view is focusable in touch mode. 5903 * @attr ref android.R.styleable#View_focusableInTouchMode 5904 */ 5905 @ViewDebug.ExportedProperty 5906 public final boolean isFocusableInTouchMode() { 5907 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5908 } 5909 5910 /** 5911 * Find the nearest view in the specified direction that can take focus. 5912 * This does not actually give focus to that view. 5913 * 5914 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5915 * 5916 * @return The nearest focusable in the specified direction, or null if none 5917 * can be found. 5918 */ 5919 public View focusSearch(int direction) { 5920 if (mParent != null) { 5921 return mParent.focusSearch(this, direction); 5922 } else { 5923 return null; 5924 } 5925 } 5926 5927 /** 5928 * This method is the last chance for the focused view and its ancestors to 5929 * respond to an arrow key. This is called when the focused view did not 5930 * consume the key internally, nor could the view system find a new view in 5931 * the requested direction to give focus to. 5932 * 5933 * @param focused The currently focused view. 5934 * @param direction The direction focus wants to move. One of FOCUS_UP, 5935 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5936 * @return True if the this view consumed this unhandled move. 5937 */ 5938 public boolean dispatchUnhandledMove(View focused, int direction) { 5939 return false; 5940 } 5941 5942 /** 5943 * If a user manually specified the next view id for a particular direction, 5944 * use the root to look up the view. 5945 * @param root The root view of the hierarchy containing this view. 5946 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5947 * or FOCUS_BACKWARD. 5948 * @return The user specified next view, or null if there is none. 5949 */ 5950 View findUserSetNextFocus(View root, int direction) { 5951 switch (direction) { 5952 case FOCUS_LEFT: 5953 if (mNextFocusLeftId == View.NO_ID) return null; 5954 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5955 case FOCUS_RIGHT: 5956 if (mNextFocusRightId == View.NO_ID) return null; 5957 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5958 case FOCUS_UP: 5959 if (mNextFocusUpId == View.NO_ID) return null; 5960 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5961 case FOCUS_DOWN: 5962 if (mNextFocusDownId == View.NO_ID) return null; 5963 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5964 case FOCUS_FORWARD: 5965 if (mNextFocusForwardId == View.NO_ID) return null; 5966 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5967 case FOCUS_BACKWARD: { 5968 if (mID == View.NO_ID) return null; 5969 final int id = mID; 5970 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5971 @Override 5972 public boolean apply(View t) { 5973 return t.mNextFocusForwardId == id; 5974 } 5975 }); 5976 } 5977 } 5978 return null; 5979 } 5980 5981 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5982 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5983 @Override 5984 public boolean apply(View t) { 5985 return t.mID == childViewId; 5986 } 5987 }); 5988 5989 if (result == null) { 5990 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5991 + "by user for id " + childViewId); 5992 } 5993 return result; 5994 } 5995 5996 /** 5997 * Find and return all focusable views that are descendants of this view, 5998 * possibly including this view if it is focusable itself. 5999 * 6000 * @param direction The direction of the focus 6001 * @return A list of focusable views 6002 */ 6003 public ArrayList<View> getFocusables(int direction) { 6004 ArrayList<View> result = new ArrayList<View>(24); 6005 addFocusables(result, direction); 6006 return result; 6007 } 6008 6009 /** 6010 * Add any focusable views that are descendants of this view (possibly 6011 * including this view if it is focusable itself) to views. If we are in touch mode, 6012 * only add views that are also focusable in touch mode. 6013 * 6014 * @param views Focusable views found so far 6015 * @param direction The direction of the focus 6016 */ 6017 public void addFocusables(ArrayList<View> views, int direction) { 6018 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6019 } 6020 6021 /** 6022 * Adds any focusable views that are descendants of this view (possibly 6023 * including this view if it is focusable itself) to views. This method 6024 * adds all focusable views regardless if we are in touch mode or 6025 * only views focusable in touch mode if we are in touch mode or 6026 * only views that can take accessibility focus if accessibility is enabeld 6027 * depending on the focusable mode paramater. 6028 * 6029 * @param views Focusable views found so far or null if all we are interested is 6030 * the number of focusables. 6031 * @param direction The direction of the focus. 6032 * @param focusableMode The type of focusables to be added. 6033 * 6034 * @see #FOCUSABLES_ALL 6035 * @see #FOCUSABLES_TOUCH_MODE 6036 */ 6037 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6038 if (views == null) { 6039 return; 6040 } 6041 if (!isFocusable()) { 6042 return; 6043 } 6044 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6045 && isInTouchMode() && !isFocusableInTouchMode()) { 6046 return; 6047 } 6048 views.add(this); 6049 } 6050 6051 /** 6052 * Finds the Views that contain given text. The containment is case insensitive. 6053 * The search is performed by either the text that the View renders or the content 6054 * description that describes the view for accessibility purposes and the view does 6055 * not render or both. Clients can specify how the search is to be performed via 6056 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6057 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6058 * 6059 * @param outViews The output list of matching Views. 6060 * @param searched The text to match against. 6061 * 6062 * @see #FIND_VIEWS_WITH_TEXT 6063 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6064 * @see #setContentDescription(CharSequence) 6065 */ 6066 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6067 if (getAccessibilityNodeProvider() != null) { 6068 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6069 outViews.add(this); 6070 } 6071 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6072 && (searched != null && searched.length() > 0) 6073 && (mContentDescription != null && mContentDescription.length() > 0)) { 6074 String searchedLowerCase = searched.toString().toLowerCase(); 6075 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6076 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6077 outViews.add(this); 6078 } 6079 } 6080 } 6081 6082 /** 6083 * Find and return all touchable views that are descendants of this view, 6084 * possibly including this view if it is touchable itself. 6085 * 6086 * @return A list of touchable views 6087 */ 6088 public ArrayList<View> getTouchables() { 6089 ArrayList<View> result = new ArrayList<View>(); 6090 addTouchables(result); 6091 return result; 6092 } 6093 6094 /** 6095 * Add any touchable views that are descendants of this view (possibly 6096 * including this view if it is touchable itself) to views. 6097 * 6098 * @param views Touchable views found so far 6099 */ 6100 public void addTouchables(ArrayList<View> views) { 6101 final int viewFlags = mViewFlags; 6102 6103 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6104 && (viewFlags & ENABLED_MASK) == ENABLED) { 6105 views.add(this); 6106 } 6107 } 6108 6109 /** 6110 * Returns whether this View is accessibility focused. 6111 * 6112 * @return True if this View is accessibility focused. 6113 */ 6114 boolean isAccessibilityFocused() { 6115 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6116 } 6117 6118 /** 6119 * Call this to try to give accessibility focus to this view. 6120 * 6121 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6122 * returns false or the view is no visible or the view already has accessibility 6123 * focus. 6124 * 6125 * See also {@link #focusSearch(int)}, which is what you call to say that you 6126 * have focus, and you want your parent to look for the next one. 6127 * 6128 * @return Whether this view actually took accessibility focus. 6129 * 6130 * @hide 6131 */ 6132 public boolean requestAccessibilityFocus() { 6133 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6134 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6135 return false; 6136 } 6137 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6138 return false; 6139 } 6140 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6141 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6142 ViewRootImpl viewRootImpl = getViewRootImpl(); 6143 if (viewRootImpl != null) { 6144 viewRootImpl.setAccessibilityFocus(this, null); 6145 } 6146 invalidate(); 6147 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6148 notifyAccessibilityStateChanged(); 6149 return true; 6150 } 6151 return false; 6152 } 6153 6154 /** 6155 * Call this to try to clear accessibility focus of this view. 6156 * 6157 * See also {@link #focusSearch(int)}, which is what you call to say that you 6158 * have focus, and you want your parent to look for the next one. 6159 * 6160 * @hide 6161 */ 6162 public void clearAccessibilityFocus() { 6163 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6164 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6165 invalidate(); 6166 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6167 notifyAccessibilityStateChanged(); 6168 } 6169 // Clear the global reference of accessibility focus if this 6170 // view or any of its descendants had accessibility focus. 6171 ViewRootImpl viewRootImpl = getViewRootImpl(); 6172 if (viewRootImpl != null) { 6173 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6174 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6175 viewRootImpl.setAccessibilityFocus(null, null); 6176 } 6177 } 6178 } 6179 6180 private void sendAccessibilityHoverEvent(int eventType) { 6181 // Since we are not delivering to a client accessibility events from not 6182 // important views (unless the clinet request that) we need to fire the 6183 // event from the deepest view exposed to the client. As a consequence if 6184 // the user crosses a not exposed view the client will see enter and exit 6185 // of the exposed predecessor followed by and enter and exit of that same 6186 // predecessor when entering and exiting the not exposed descendant. This 6187 // is fine since the client has a clear idea which view is hovered at the 6188 // price of a couple more events being sent. This is a simple and 6189 // working solution. 6190 View source = this; 6191 while (true) { 6192 if (source.includeForAccessibility()) { 6193 source.sendAccessibilityEvent(eventType); 6194 return; 6195 } 6196 ViewParent parent = source.getParent(); 6197 if (parent instanceof View) { 6198 source = (View) parent; 6199 } else { 6200 return; 6201 } 6202 } 6203 } 6204 6205 /** 6206 * Clears accessibility focus without calling any callback methods 6207 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6208 * is used for clearing accessibility focus when giving this focus to 6209 * another view. 6210 */ 6211 void clearAccessibilityFocusNoCallbacks() { 6212 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6213 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6214 invalidate(); 6215 } 6216 } 6217 6218 /** 6219 * Call this to try to give focus to a specific view or to one of its 6220 * descendants. 6221 * 6222 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6223 * false), or if it is focusable and it is not focusable in touch mode 6224 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6225 * 6226 * See also {@link #focusSearch(int)}, which is what you call to say that you 6227 * have focus, and you want your parent to look for the next one. 6228 * 6229 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6230 * {@link #FOCUS_DOWN} and <code>null</code>. 6231 * 6232 * @return Whether this view or one of its descendants actually took focus. 6233 */ 6234 public final boolean requestFocus() { 6235 return requestFocus(View.FOCUS_DOWN); 6236 } 6237 6238 /** 6239 * Call this to try to give focus to a specific view or to one of its 6240 * descendants and give it a hint about what direction focus is heading. 6241 * 6242 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6243 * false), or if it is focusable and it is not focusable in touch mode 6244 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6245 * 6246 * See also {@link #focusSearch(int)}, which is what you call to say that you 6247 * have focus, and you want your parent to look for the next one. 6248 * 6249 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6250 * <code>null</code> set for the previously focused rectangle. 6251 * 6252 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6253 * @return Whether this view or one of its descendants actually took focus. 6254 */ 6255 public final boolean requestFocus(int direction) { 6256 return requestFocus(direction, null); 6257 } 6258 6259 /** 6260 * Call this to try to give focus to a specific view or to one of its descendants 6261 * and give it hints about the direction and a specific rectangle that the focus 6262 * is coming from. The rectangle can help give larger views a finer grained hint 6263 * about where focus is coming from, and therefore, where to show selection, or 6264 * forward focus change internally. 6265 * 6266 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6267 * false), or if it is focusable and it is not focusable in touch mode 6268 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6269 * 6270 * A View will not take focus if it is not visible. 6271 * 6272 * A View will not take focus if one of its parents has 6273 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6274 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6275 * 6276 * See also {@link #focusSearch(int)}, which is what you call to say that you 6277 * have focus, and you want your parent to look for the next one. 6278 * 6279 * You may wish to override this method if your custom {@link View} has an internal 6280 * {@link View} that it wishes to forward the request to. 6281 * 6282 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6283 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6284 * to give a finer grained hint about where focus is coming from. May be null 6285 * if there is no hint. 6286 * @return Whether this view or one of its descendants actually took focus. 6287 */ 6288 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6289 return requestFocusNoSearch(direction, previouslyFocusedRect); 6290 } 6291 6292 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6293 // need to be focusable 6294 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6295 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6296 return false; 6297 } 6298 6299 // need to be focusable in touch mode if in touch mode 6300 if (isInTouchMode() && 6301 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6302 return false; 6303 } 6304 6305 // need to not have any parents blocking us 6306 if (hasAncestorThatBlocksDescendantFocus()) { 6307 return false; 6308 } 6309 6310 handleFocusGainInternal(direction, previouslyFocusedRect); 6311 return true; 6312 } 6313 6314 /** 6315 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6316 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6317 * touch mode to request focus when they are touched. 6318 * 6319 * @return Whether this view or one of its descendants actually took focus. 6320 * 6321 * @see #isInTouchMode() 6322 * 6323 */ 6324 public final boolean requestFocusFromTouch() { 6325 // Leave touch mode if we need to 6326 if (isInTouchMode()) { 6327 ViewRootImpl viewRoot = getViewRootImpl(); 6328 if (viewRoot != null) { 6329 viewRoot.ensureTouchMode(false); 6330 } 6331 } 6332 return requestFocus(View.FOCUS_DOWN); 6333 } 6334 6335 /** 6336 * @return Whether any ancestor of this view blocks descendant focus. 6337 */ 6338 private boolean hasAncestorThatBlocksDescendantFocus() { 6339 ViewParent ancestor = mParent; 6340 while (ancestor instanceof ViewGroup) { 6341 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6342 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6343 return true; 6344 } else { 6345 ancestor = vgAncestor.getParent(); 6346 } 6347 } 6348 return false; 6349 } 6350 6351 /** 6352 * Gets the mode for determining whether this View is important for accessibility 6353 * which is if it fires accessibility events and if it is reported to 6354 * accessibility services that query the screen. 6355 * 6356 * @return The mode for determining whether a View is important for accessibility. 6357 * 6358 * @attr ref android.R.styleable#View_importantForAccessibility 6359 * 6360 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6361 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6362 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6363 */ 6364 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6365 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6366 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6367 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6368 }) 6369 public int getImportantForAccessibility() { 6370 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6371 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6372 } 6373 6374 /** 6375 * Sets how to determine whether this view is important for accessibility 6376 * which is if it fires accessibility events and if it is reported to 6377 * accessibility services that query the screen. 6378 * 6379 * @param mode How to determine whether this view is important for accessibility. 6380 * 6381 * @attr ref android.R.styleable#View_importantForAccessibility 6382 * 6383 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6384 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6385 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6386 */ 6387 public void setImportantForAccessibility(int mode) { 6388 if (mode != getImportantForAccessibility()) { 6389 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6390 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6391 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6392 notifyAccessibilityStateChanged(); 6393 } 6394 } 6395 6396 /** 6397 * Gets whether this view should be exposed for accessibility. 6398 * 6399 * @return Whether the view is exposed for accessibility. 6400 * 6401 * @hide 6402 */ 6403 public boolean isImportantForAccessibility() { 6404 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6405 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6406 switch (mode) { 6407 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6408 return true; 6409 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6410 return false; 6411 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6412 return isActionableForAccessibility() || hasListenersForAccessibility(); 6413 default: 6414 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6415 + mode); 6416 } 6417 } 6418 6419 /** 6420 * Gets the parent for accessibility purposes. Note that the parent for 6421 * accessibility is not necessary the immediate parent. It is the first 6422 * predecessor that is important for accessibility. 6423 * 6424 * @return The parent for accessibility purposes. 6425 */ 6426 public ViewParent getParentForAccessibility() { 6427 if (mParent instanceof View) { 6428 View parentView = (View) mParent; 6429 if (parentView.includeForAccessibility()) { 6430 return mParent; 6431 } else { 6432 return mParent.getParentForAccessibility(); 6433 } 6434 } 6435 return null; 6436 } 6437 6438 /** 6439 * Adds the children of a given View for accessibility. Since some Views are 6440 * not important for accessibility the children for accessibility are not 6441 * necessarily direct children of the riew, rather they are the first level of 6442 * descendants important for accessibility. 6443 * 6444 * @param children The list of children for accessibility. 6445 */ 6446 public void addChildrenForAccessibility(ArrayList<View> children) { 6447 if (includeForAccessibility()) { 6448 children.add(this); 6449 } 6450 } 6451 6452 /** 6453 * Whether to regard this view for accessibility. A view is regarded for 6454 * accessibility if it is important for accessibility or the querying 6455 * accessibility service has explicitly requested that view not 6456 * important for accessibility are regarded. 6457 * 6458 * @return Whether to regard the view for accessibility. 6459 * 6460 * @hide 6461 */ 6462 public boolean includeForAccessibility() { 6463 if (mAttachInfo != null) { 6464 if (!mAttachInfo.mIncludeNotImportantViews) { 6465 return isImportantForAccessibility(); 6466 } 6467 return true; 6468 } 6469 return false; 6470 } 6471 6472 /** 6473 * Returns whether the View is considered actionable from 6474 * accessibility perspective. Such view are important for 6475 * accessiiblity. 6476 * 6477 * @return True if the view is actionable for accessibility. 6478 * 6479 * @hide 6480 */ 6481 public boolean isActionableForAccessibility() { 6482 return (isClickable() || isLongClickable() || isFocusable()); 6483 } 6484 6485 /** 6486 * Returns whether the View has registered callbacks wich makes it 6487 * important for accessiiblity. 6488 * 6489 * @return True if the view is actionable for accessibility. 6490 */ 6491 private boolean hasListenersForAccessibility() { 6492 ListenerInfo info = getListenerInfo(); 6493 return mTouchDelegate != null || info.mOnKeyListener != null 6494 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6495 || info.mOnHoverListener != null || info.mOnDragListener != null; 6496 } 6497 6498 /** 6499 * Notifies accessibility services that some view's important for 6500 * accessibility state has changed. Note that such notifications 6501 * are made at most once every 6502 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6503 * to avoid unnecessary load to the system. Also once a view has 6504 * made a notifucation this method is a NOP until the notification has 6505 * been sent to clients. 6506 * 6507 * @hide 6508 * 6509 * TODO: Makse sure this method is called for any view state change 6510 * that is interesting for accessilility purposes. 6511 */ 6512 public void notifyAccessibilityStateChanged() { 6513 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6514 return; 6515 } 6516 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6517 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6518 if (mParent != null) { 6519 mParent.childAccessibilityStateChanged(this); 6520 } 6521 } 6522 } 6523 6524 /** 6525 * Reset the state indicating the this view has requested clients 6526 * interested in its accessiblity state to be notified. 6527 * 6528 * @hide 6529 */ 6530 public void resetAccessibilityStateChanged() { 6531 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6532 } 6533 6534 /** 6535 * Performs the specified accessibility action on the view. For 6536 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6537 * <p> 6538 * If an {@link AccessibilityDelegate} has been specified via calling 6539 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6540 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6541 * is responsible for handling this call. 6542 * </p> 6543 * 6544 * @param action The action to perform. 6545 * @param arguments Optional action arguments. 6546 * @return Whether the action was performed. 6547 */ 6548 public boolean performAccessibilityAction(int action, Bundle arguments) { 6549 if (mAccessibilityDelegate != null) { 6550 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6551 } else { 6552 return performAccessibilityActionInternal(action, arguments); 6553 } 6554 } 6555 6556 /** 6557 * @see #performAccessibilityAction(int, Bundle) 6558 * 6559 * Note: Called from the default {@link AccessibilityDelegate}. 6560 */ 6561 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6562 switch (action) { 6563 case AccessibilityNodeInfo.ACTION_CLICK: { 6564 if (isClickable()) { 6565 return performClick(); 6566 } 6567 } break; 6568 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6569 if (isLongClickable()) { 6570 return performLongClick(); 6571 } 6572 } break; 6573 case AccessibilityNodeInfo.ACTION_FOCUS: { 6574 if (!hasFocus()) { 6575 // Get out of touch mode since accessibility 6576 // wants to move focus around. 6577 getViewRootImpl().ensureTouchMode(false); 6578 return requestFocus(); 6579 } 6580 } break; 6581 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6582 if (hasFocus()) { 6583 clearFocus(); 6584 return !isFocused(); 6585 } 6586 } break; 6587 case AccessibilityNodeInfo.ACTION_SELECT: { 6588 if (!isSelected()) { 6589 setSelected(true); 6590 return isSelected(); 6591 } 6592 } break; 6593 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6594 if (isSelected()) { 6595 setSelected(false); 6596 return !isSelected(); 6597 } 6598 } break; 6599 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6600 if (!isAccessibilityFocused()) { 6601 return requestAccessibilityFocus(); 6602 } 6603 } break; 6604 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6605 if (isAccessibilityFocused()) { 6606 clearAccessibilityFocus(); 6607 return true; 6608 } 6609 } break; 6610 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6611 if (arguments != null) { 6612 final int granularity = arguments.getInt( 6613 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6614 return nextAtGranularity(granularity); 6615 } 6616 } break; 6617 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6618 if (arguments != null) { 6619 final int granularity = arguments.getInt( 6620 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6621 return previousAtGranularity(granularity); 6622 } 6623 } break; 6624 } 6625 return false; 6626 } 6627 6628 private boolean nextAtGranularity(int granularity) { 6629 CharSequence text = getIterableTextForAccessibility(); 6630 if (text == null || text.length() == 0) { 6631 return false; 6632 } 6633 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6634 if (iterator == null) { 6635 return false; 6636 } 6637 final int current = getAccessibilityCursorPosition(); 6638 final int[] range = iterator.following(current); 6639 if (range == null) { 6640 return false; 6641 } 6642 final int start = range[0]; 6643 final int end = range[1]; 6644 setAccessibilityCursorPosition(end); 6645 sendViewTextTraversedAtGranularityEvent( 6646 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6647 granularity, start, end); 6648 return true; 6649 } 6650 6651 private boolean previousAtGranularity(int granularity) { 6652 CharSequence text = getIterableTextForAccessibility(); 6653 if (text == null || text.length() == 0) { 6654 return false; 6655 } 6656 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6657 if (iterator == null) { 6658 return false; 6659 } 6660 int current = getAccessibilityCursorPosition(); 6661 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 6662 current = text.length(); 6663 } else if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6664 // When traversing by character we always put the cursor after the character 6665 // to ease edit and have to compensate before asking the for previous segment. 6666 current--; 6667 } 6668 final int[] range = iterator.preceding(current); 6669 if (range == null) { 6670 return false; 6671 } 6672 final int start = range[0]; 6673 final int end = range[1]; 6674 // Always put the cursor after the character to ease edit. 6675 if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6676 setAccessibilityCursorPosition(end); 6677 } else { 6678 setAccessibilityCursorPosition(start); 6679 } 6680 sendViewTextTraversedAtGranularityEvent( 6681 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6682 granularity, start, end); 6683 return true; 6684 } 6685 6686 /** 6687 * Gets the text reported for accessibility purposes. 6688 * 6689 * @return The accessibility text. 6690 * 6691 * @hide 6692 */ 6693 public CharSequence getIterableTextForAccessibility() { 6694 return mContentDescription; 6695 } 6696 6697 /** 6698 * @hide 6699 */ 6700 public int getAccessibilityCursorPosition() { 6701 return mAccessibilityCursorPosition; 6702 } 6703 6704 /** 6705 * @hide 6706 */ 6707 public void setAccessibilityCursorPosition(int position) { 6708 mAccessibilityCursorPosition = position; 6709 } 6710 6711 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6712 int fromIndex, int toIndex) { 6713 if (mParent == null) { 6714 return; 6715 } 6716 AccessibilityEvent event = AccessibilityEvent.obtain( 6717 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6718 onInitializeAccessibilityEvent(event); 6719 onPopulateAccessibilityEvent(event); 6720 event.setFromIndex(fromIndex); 6721 event.setToIndex(toIndex); 6722 event.setAction(action); 6723 event.setMovementGranularity(granularity); 6724 mParent.requestSendAccessibilityEvent(this, event); 6725 } 6726 6727 /** 6728 * @hide 6729 */ 6730 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6731 switch (granularity) { 6732 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6733 CharSequence text = getIterableTextForAccessibility(); 6734 if (text != null && text.length() > 0) { 6735 CharacterTextSegmentIterator iterator = 6736 CharacterTextSegmentIterator.getInstance( 6737 mContext.getResources().getConfiguration().locale); 6738 iterator.initialize(text.toString()); 6739 return iterator; 6740 } 6741 } break; 6742 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6743 CharSequence text = getIterableTextForAccessibility(); 6744 if (text != null && text.length() > 0) { 6745 WordTextSegmentIterator iterator = 6746 WordTextSegmentIterator.getInstance( 6747 mContext.getResources().getConfiguration().locale); 6748 iterator.initialize(text.toString()); 6749 return iterator; 6750 } 6751 } break; 6752 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6753 CharSequence text = getIterableTextForAccessibility(); 6754 if (text != null && text.length() > 0) { 6755 ParagraphTextSegmentIterator iterator = 6756 ParagraphTextSegmentIterator.getInstance(); 6757 iterator.initialize(text.toString()); 6758 return iterator; 6759 } 6760 } break; 6761 } 6762 return null; 6763 } 6764 6765 /** 6766 * @hide 6767 */ 6768 public void dispatchStartTemporaryDetach() { 6769 clearAccessibilityFocus(); 6770 clearDisplayList(); 6771 6772 onStartTemporaryDetach(); 6773 } 6774 6775 /** 6776 * This is called when a container is going to temporarily detach a child, with 6777 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6778 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6779 * {@link #onDetachedFromWindow()} when the container is done. 6780 */ 6781 public void onStartTemporaryDetach() { 6782 removeUnsetPressCallback(); 6783 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6784 } 6785 6786 /** 6787 * @hide 6788 */ 6789 public void dispatchFinishTemporaryDetach() { 6790 onFinishTemporaryDetach(); 6791 } 6792 6793 /** 6794 * Called after {@link #onStartTemporaryDetach} when the container is done 6795 * changing the view. 6796 */ 6797 public void onFinishTemporaryDetach() { 6798 } 6799 6800 /** 6801 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6802 * for this view's window. Returns null if the view is not currently attached 6803 * to the window. Normally you will not need to use this directly, but 6804 * just use the standard high-level event callbacks like 6805 * {@link #onKeyDown(int, KeyEvent)}. 6806 */ 6807 public KeyEvent.DispatcherState getKeyDispatcherState() { 6808 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6809 } 6810 6811 /** 6812 * Dispatch a key event before it is processed by any input method 6813 * associated with the view hierarchy. This can be used to intercept 6814 * key events in special situations before the IME consumes them; a 6815 * typical example would be handling the BACK key to update the application's 6816 * UI instead of allowing the IME to see it and close itself. 6817 * 6818 * @param event The key event to be dispatched. 6819 * @return True if the event was handled, false otherwise. 6820 */ 6821 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6822 return onKeyPreIme(event.getKeyCode(), event); 6823 } 6824 6825 /** 6826 * Dispatch a key event to the next view on the focus path. This path runs 6827 * from the top of the view tree down to the currently focused view. If this 6828 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6829 * the next node down the focus path. This method also fires any key 6830 * listeners. 6831 * 6832 * @param event The key event to be dispatched. 6833 * @return True if the event was handled, false otherwise. 6834 */ 6835 public boolean dispatchKeyEvent(KeyEvent event) { 6836 if (mInputEventConsistencyVerifier != null) { 6837 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6838 } 6839 6840 // Give any attached key listener a first crack at the event. 6841 //noinspection SimplifiableIfStatement 6842 ListenerInfo li = mListenerInfo; 6843 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6844 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6845 return true; 6846 } 6847 6848 if (event.dispatch(this, mAttachInfo != null 6849 ? mAttachInfo.mKeyDispatchState : null, this)) { 6850 return true; 6851 } 6852 6853 if (mInputEventConsistencyVerifier != null) { 6854 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6855 } 6856 return false; 6857 } 6858 6859 /** 6860 * Dispatches a key shortcut event. 6861 * 6862 * @param event The key event to be dispatched. 6863 * @return True if the event was handled by the view, false otherwise. 6864 */ 6865 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6866 return onKeyShortcut(event.getKeyCode(), event); 6867 } 6868 6869 /** 6870 * Pass the touch screen motion event down to the target view, or this 6871 * view if it is the target. 6872 * 6873 * @param event The motion event to be dispatched. 6874 * @return True if the event was handled by the view, false otherwise. 6875 */ 6876 public boolean dispatchTouchEvent(MotionEvent event) { 6877 if (mInputEventConsistencyVerifier != null) { 6878 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6879 } 6880 6881 if (onFilterTouchEventForSecurity(event)) { 6882 //noinspection SimplifiableIfStatement 6883 ListenerInfo li = mListenerInfo; 6884 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6885 && li.mOnTouchListener.onTouch(this, event)) { 6886 return true; 6887 } 6888 6889 if (onTouchEvent(event)) { 6890 return true; 6891 } 6892 } 6893 6894 if (mInputEventConsistencyVerifier != null) { 6895 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6896 } 6897 return false; 6898 } 6899 6900 /** 6901 * Filter the touch event to apply security policies. 6902 * 6903 * @param event The motion event to be filtered. 6904 * @return True if the event should be dispatched, false if the event should be dropped. 6905 * 6906 * @see #getFilterTouchesWhenObscured 6907 */ 6908 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6909 //noinspection RedundantIfStatement 6910 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6911 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6912 // Window is obscured, drop this touch. 6913 return false; 6914 } 6915 return true; 6916 } 6917 6918 /** 6919 * Pass a trackball motion event down to the focused view. 6920 * 6921 * @param event The motion event to be dispatched. 6922 * @return True if the event was handled by the view, false otherwise. 6923 */ 6924 public boolean dispatchTrackballEvent(MotionEvent event) { 6925 if (mInputEventConsistencyVerifier != null) { 6926 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6927 } 6928 6929 return onTrackballEvent(event); 6930 } 6931 6932 /** 6933 * Dispatch a generic motion event. 6934 * <p> 6935 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6936 * are delivered to the view under the pointer. All other generic motion events are 6937 * delivered to the focused view. Hover events are handled specially and are delivered 6938 * to {@link #onHoverEvent(MotionEvent)}. 6939 * </p> 6940 * 6941 * @param event The motion event to be dispatched. 6942 * @return True if the event was handled by the view, false otherwise. 6943 */ 6944 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6945 if (mInputEventConsistencyVerifier != null) { 6946 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6947 } 6948 6949 final int source = event.getSource(); 6950 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6951 final int action = event.getAction(); 6952 if (action == MotionEvent.ACTION_HOVER_ENTER 6953 || action == MotionEvent.ACTION_HOVER_MOVE 6954 || action == MotionEvent.ACTION_HOVER_EXIT) { 6955 if (dispatchHoverEvent(event)) { 6956 return true; 6957 } 6958 } else if (dispatchGenericPointerEvent(event)) { 6959 return true; 6960 } 6961 } else if (dispatchGenericFocusedEvent(event)) { 6962 return true; 6963 } 6964 6965 if (dispatchGenericMotionEventInternal(event)) { 6966 return true; 6967 } 6968 6969 if (mInputEventConsistencyVerifier != null) { 6970 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6971 } 6972 return false; 6973 } 6974 6975 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6976 //noinspection SimplifiableIfStatement 6977 ListenerInfo li = mListenerInfo; 6978 if (li != null && li.mOnGenericMotionListener != null 6979 && (mViewFlags & ENABLED_MASK) == ENABLED 6980 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6981 return true; 6982 } 6983 6984 if (onGenericMotionEvent(event)) { 6985 return true; 6986 } 6987 6988 if (mInputEventConsistencyVerifier != null) { 6989 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6990 } 6991 return false; 6992 } 6993 6994 /** 6995 * Dispatch a hover event. 6996 * <p> 6997 * Do not call this method directly. 6998 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6999 * </p> 7000 * 7001 * @param event The motion event to be dispatched. 7002 * @return True if the event was handled by the view, false otherwise. 7003 */ 7004 protected boolean dispatchHoverEvent(MotionEvent event) { 7005 //noinspection SimplifiableIfStatement 7006 ListenerInfo li = mListenerInfo; 7007 if (li != null && li.mOnHoverListener != null 7008 && (mViewFlags & ENABLED_MASK) == ENABLED 7009 && li.mOnHoverListener.onHover(this, event)) { 7010 return true; 7011 } 7012 7013 return onHoverEvent(event); 7014 } 7015 7016 /** 7017 * Returns true if the view has a child to which it has recently sent 7018 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7019 * it does not have a hovered child, then it must be the innermost hovered view. 7020 * @hide 7021 */ 7022 protected boolean hasHoveredChild() { 7023 return false; 7024 } 7025 7026 /** 7027 * Dispatch a generic motion event to the view under the first pointer. 7028 * <p> 7029 * Do not call this method directly. 7030 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7031 * </p> 7032 * 7033 * @param event The motion event to be dispatched. 7034 * @return True if the event was handled by the view, false otherwise. 7035 */ 7036 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7037 return false; 7038 } 7039 7040 /** 7041 * Dispatch a generic motion event to the currently focused view. 7042 * <p> 7043 * Do not call this method directly. 7044 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7045 * </p> 7046 * 7047 * @param event The motion event to be dispatched. 7048 * @return True if the event was handled by the view, false otherwise. 7049 */ 7050 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7051 return false; 7052 } 7053 7054 /** 7055 * Dispatch a pointer event. 7056 * <p> 7057 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7058 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7059 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7060 * and should not be expected to handle other pointing device features. 7061 * </p> 7062 * 7063 * @param event The motion event to be dispatched. 7064 * @return True if the event was handled by the view, false otherwise. 7065 * @hide 7066 */ 7067 public final boolean dispatchPointerEvent(MotionEvent event) { 7068 if (event.isTouchEvent()) { 7069 return dispatchTouchEvent(event); 7070 } else { 7071 return dispatchGenericMotionEvent(event); 7072 } 7073 } 7074 7075 /** 7076 * Called when the window containing this view gains or loses window focus. 7077 * ViewGroups should override to route to their children. 7078 * 7079 * @param hasFocus True if the window containing this view now has focus, 7080 * false otherwise. 7081 */ 7082 public void dispatchWindowFocusChanged(boolean hasFocus) { 7083 onWindowFocusChanged(hasFocus); 7084 } 7085 7086 /** 7087 * Called when the window containing this view gains or loses focus. Note 7088 * that this is separate from view focus: to receive key events, both 7089 * your view and its window must have focus. If a window is displayed 7090 * on top of yours that takes input focus, then your own window will lose 7091 * focus but the view focus will remain unchanged. 7092 * 7093 * @param hasWindowFocus True if the window containing this view now has 7094 * focus, false otherwise. 7095 */ 7096 public void onWindowFocusChanged(boolean hasWindowFocus) { 7097 InputMethodManager imm = InputMethodManager.peekInstance(); 7098 if (!hasWindowFocus) { 7099 if (isPressed()) { 7100 setPressed(false); 7101 } 7102 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7103 imm.focusOut(this); 7104 } 7105 removeLongPressCallback(); 7106 removeTapCallback(); 7107 onFocusLost(); 7108 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7109 imm.focusIn(this); 7110 } 7111 refreshDrawableState(); 7112 } 7113 7114 /** 7115 * Returns true if this view is in a window that currently has window focus. 7116 * Note that this is not the same as the view itself having focus. 7117 * 7118 * @return True if this view is in a window that currently has window focus. 7119 */ 7120 public boolean hasWindowFocus() { 7121 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7122 } 7123 7124 /** 7125 * Dispatch a view visibility change down the view hierarchy. 7126 * ViewGroups should override to route to their children. 7127 * @param changedView The view whose visibility changed. Could be 'this' or 7128 * an ancestor view. 7129 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7130 * {@link #INVISIBLE} or {@link #GONE}. 7131 */ 7132 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7133 onVisibilityChanged(changedView, visibility); 7134 } 7135 7136 /** 7137 * Called when the visibility of the view or an ancestor of the view is changed. 7138 * @param changedView The view whose visibility changed. Could be 'this' or 7139 * an ancestor view. 7140 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7141 * {@link #INVISIBLE} or {@link #GONE}. 7142 */ 7143 protected void onVisibilityChanged(View changedView, int visibility) { 7144 if (visibility == VISIBLE) { 7145 if (mAttachInfo != null) { 7146 initialAwakenScrollBars(); 7147 } else { 7148 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7149 } 7150 } 7151 } 7152 7153 /** 7154 * Dispatch a hint about whether this view is displayed. For instance, when 7155 * a View moves out of the screen, it might receives a display hint indicating 7156 * the view is not displayed. Applications should not <em>rely</em> on this hint 7157 * as there is no guarantee that they will receive one. 7158 * 7159 * @param hint A hint about whether or not this view is displayed: 7160 * {@link #VISIBLE} or {@link #INVISIBLE}. 7161 */ 7162 public void dispatchDisplayHint(int hint) { 7163 onDisplayHint(hint); 7164 } 7165 7166 /** 7167 * Gives this view a hint about whether is displayed or not. For instance, when 7168 * a View moves out of the screen, it might receives a display hint indicating 7169 * the view is not displayed. Applications should not <em>rely</em> on this hint 7170 * as there is no guarantee that they will receive one. 7171 * 7172 * @param hint A hint about whether or not this view is displayed: 7173 * {@link #VISIBLE} or {@link #INVISIBLE}. 7174 */ 7175 protected void onDisplayHint(int hint) { 7176 } 7177 7178 /** 7179 * Dispatch a window visibility change down the view hierarchy. 7180 * ViewGroups should override to route to their children. 7181 * 7182 * @param visibility The new visibility of the window. 7183 * 7184 * @see #onWindowVisibilityChanged(int) 7185 */ 7186 public void dispatchWindowVisibilityChanged(int visibility) { 7187 onWindowVisibilityChanged(visibility); 7188 } 7189 7190 /** 7191 * Called when the window containing has change its visibility 7192 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7193 * that this tells you whether or not your window is being made visible 7194 * to the window manager; this does <em>not</em> tell you whether or not 7195 * your window is obscured by other windows on the screen, even if it 7196 * is itself visible. 7197 * 7198 * @param visibility The new visibility of the window. 7199 */ 7200 protected void onWindowVisibilityChanged(int visibility) { 7201 if (visibility == VISIBLE) { 7202 initialAwakenScrollBars(); 7203 } 7204 } 7205 7206 /** 7207 * Returns the current visibility of the window this view is attached to 7208 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7209 * 7210 * @return Returns the current visibility of the view's window. 7211 */ 7212 public int getWindowVisibility() { 7213 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7214 } 7215 7216 /** 7217 * Retrieve the overall visible display size in which the window this view is 7218 * attached to has been positioned in. This takes into account screen 7219 * decorations above the window, for both cases where the window itself 7220 * is being position inside of them or the window is being placed under 7221 * then and covered insets are used for the window to position its content 7222 * inside. In effect, this tells you the available area where content can 7223 * be placed and remain visible to users. 7224 * 7225 * <p>This function requires an IPC back to the window manager to retrieve 7226 * the requested information, so should not be used in performance critical 7227 * code like drawing. 7228 * 7229 * @param outRect Filled in with the visible display frame. If the view 7230 * is not attached to a window, this is simply the raw display size. 7231 */ 7232 public void getWindowVisibleDisplayFrame(Rect outRect) { 7233 if (mAttachInfo != null) { 7234 try { 7235 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7236 } catch (RemoteException e) { 7237 return; 7238 } 7239 // XXX This is really broken, and probably all needs to be done 7240 // in the window manager, and we need to know more about whether 7241 // we want the area behind or in front of the IME. 7242 final Rect insets = mAttachInfo.mVisibleInsets; 7243 outRect.left += insets.left; 7244 outRect.top += insets.top; 7245 outRect.right -= insets.right; 7246 outRect.bottom -= insets.bottom; 7247 return; 7248 } 7249 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7250 d.getRectSize(outRect); 7251 } 7252 7253 /** 7254 * Dispatch a notification about a resource configuration change down 7255 * the view hierarchy. 7256 * ViewGroups should override to route to their children. 7257 * 7258 * @param newConfig The new resource configuration. 7259 * 7260 * @see #onConfigurationChanged(android.content.res.Configuration) 7261 */ 7262 public void dispatchConfigurationChanged(Configuration newConfig) { 7263 onConfigurationChanged(newConfig); 7264 } 7265 7266 /** 7267 * Called when the current configuration of the resources being used 7268 * by the application have changed. You can use this to decide when 7269 * to reload resources that can changed based on orientation and other 7270 * configuration characterstics. You only need to use this if you are 7271 * not relying on the normal {@link android.app.Activity} mechanism of 7272 * recreating the activity instance upon a configuration change. 7273 * 7274 * @param newConfig The new resource configuration. 7275 */ 7276 protected void onConfigurationChanged(Configuration newConfig) { 7277 } 7278 7279 /** 7280 * Private function to aggregate all per-view attributes in to the view 7281 * root. 7282 */ 7283 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7284 performCollectViewAttributes(attachInfo, visibility); 7285 } 7286 7287 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7288 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7289 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7290 attachInfo.mKeepScreenOn = true; 7291 } 7292 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7293 ListenerInfo li = mListenerInfo; 7294 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7295 attachInfo.mHasSystemUiListeners = true; 7296 } 7297 } 7298 } 7299 7300 void needGlobalAttributesUpdate(boolean force) { 7301 final AttachInfo ai = mAttachInfo; 7302 if (ai != null) { 7303 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7304 || ai.mHasSystemUiListeners) { 7305 ai.mRecomputeGlobalAttributes = true; 7306 } 7307 } 7308 } 7309 7310 /** 7311 * Returns whether the device is currently in touch mode. Touch mode is entered 7312 * once the user begins interacting with the device by touch, and affects various 7313 * things like whether focus is always visible to the user. 7314 * 7315 * @return Whether the device is in touch mode. 7316 */ 7317 @ViewDebug.ExportedProperty 7318 public boolean isInTouchMode() { 7319 if (mAttachInfo != null) { 7320 return mAttachInfo.mInTouchMode; 7321 } else { 7322 return ViewRootImpl.isInTouchMode(); 7323 } 7324 } 7325 7326 /** 7327 * Returns the context the view is running in, through which it can 7328 * access the current theme, resources, etc. 7329 * 7330 * @return The view's Context. 7331 */ 7332 @ViewDebug.CapturedViewProperty 7333 public final Context getContext() { 7334 return mContext; 7335 } 7336 7337 /** 7338 * Handle a key event before it is processed by any input method 7339 * associated with the view hierarchy. This can be used to intercept 7340 * key events in special situations before the IME consumes them; a 7341 * typical example would be handling the BACK key to update the application's 7342 * UI instead of allowing the IME to see it and close itself. 7343 * 7344 * @param keyCode The value in event.getKeyCode(). 7345 * @param event Description of the key event. 7346 * @return If you handled the event, return true. If you want to allow the 7347 * event to be handled by the next receiver, return false. 7348 */ 7349 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7350 return false; 7351 } 7352 7353 /** 7354 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7355 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7356 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7357 * is released, if the view is enabled and clickable. 7358 * 7359 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7360 * although some may elect to do so in some situations. Do not rely on this to 7361 * catch software key presses. 7362 * 7363 * @param keyCode A key code that represents the button pressed, from 7364 * {@link android.view.KeyEvent}. 7365 * @param event The KeyEvent object that defines the button action. 7366 */ 7367 public boolean onKeyDown(int keyCode, KeyEvent event) { 7368 boolean result = false; 7369 7370 switch (keyCode) { 7371 case KeyEvent.KEYCODE_DPAD_CENTER: 7372 case KeyEvent.KEYCODE_ENTER: { 7373 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7374 return true; 7375 } 7376 // Long clickable items don't necessarily have to be clickable 7377 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7378 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7379 (event.getRepeatCount() == 0)) { 7380 setPressed(true); 7381 checkForLongClick(0); 7382 return true; 7383 } 7384 break; 7385 } 7386 } 7387 return result; 7388 } 7389 7390 /** 7391 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7392 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7393 * the event). 7394 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7395 * although some may elect to do so in some situations. Do not rely on this to 7396 * catch software key presses. 7397 */ 7398 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7399 return false; 7400 } 7401 7402 /** 7403 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7404 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7405 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7406 * {@link KeyEvent#KEYCODE_ENTER} is released. 7407 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7408 * although some may elect to do so in some situations. Do not rely on this to 7409 * catch software key presses. 7410 * 7411 * @param keyCode A key code that represents the button pressed, from 7412 * {@link android.view.KeyEvent}. 7413 * @param event The KeyEvent object that defines the button action. 7414 */ 7415 public boolean onKeyUp(int keyCode, KeyEvent event) { 7416 boolean result = false; 7417 7418 switch (keyCode) { 7419 case KeyEvent.KEYCODE_DPAD_CENTER: 7420 case KeyEvent.KEYCODE_ENTER: { 7421 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7422 return true; 7423 } 7424 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7425 setPressed(false); 7426 7427 if (!mHasPerformedLongPress) { 7428 // This is a tap, so remove the longpress check 7429 removeLongPressCallback(); 7430 7431 result = performClick(); 7432 } 7433 } 7434 break; 7435 } 7436 } 7437 return result; 7438 } 7439 7440 /** 7441 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7442 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7443 * the event). 7444 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7445 * although some may elect to do so in some situations. Do not rely on this to 7446 * catch software key presses. 7447 * 7448 * @param keyCode A key code that represents the button pressed, from 7449 * {@link android.view.KeyEvent}. 7450 * @param repeatCount The number of times the action was made. 7451 * @param event The KeyEvent object that defines the button action. 7452 */ 7453 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7454 return false; 7455 } 7456 7457 /** 7458 * Called on the focused view when a key shortcut event is not handled. 7459 * Override this method to implement local key shortcuts for the View. 7460 * Key shortcuts can also be implemented by setting the 7461 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7462 * 7463 * @param keyCode The value in event.getKeyCode(). 7464 * @param event Description of the key event. 7465 * @return If you handled the event, return true. If you want to allow the 7466 * event to be handled by the next receiver, return false. 7467 */ 7468 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7469 return false; 7470 } 7471 7472 /** 7473 * Check whether the called view is a text editor, in which case it 7474 * would make sense to automatically display a soft input window for 7475 * it. Subclasses should override this if they implement 7476 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7477 * a call on that method would return a non-null InputConnection, and 7478 * they are really a first-class editor that the user would normally 7479 * start typing on when the go into a window containing your view. 7480 * 7481 * <p>The default implementation always returns false. This does 7482 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7483 * will not be called or the user can not otherwise perform edits on your 7484 * view; it is just a hint to the system that this is not the primary 7485 * purpose of this view. 7486 * 7487 * @return Returns true if this view is a text editor, else false. 7488 */ 7489 public boolean onCheckIsTextEditor() { 7490 return false; 7491 } 7492 7493 /** 7494 * Create a new InputConnection for an InputMethod to interact 7495 * with the view. The default implementation returns null, since it doesn't 7496 * support input methods. You can override this to implement such support. 7497 * This is only needed for views that take focus and text input. 7498 * 7499 * <p>When implementing this, you probably also want to implement 7500 * {@link #onCheckIsTextEditor()} to indicate you will return a 7501 * non-null InputConnection. 7502 * 7503 * @param outAttrs Fill in with attribute information about the connection. 7504 */ 7505 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7506 return null; 7507 } 7508 7509 /** 7510 * Called by the {@link android.view.inputmethod.InputMethodManager} 7511 * when a view who is not the current 7512 * input connection target is trying to make a call on the manager. The 7513 * default implementation returns false; you can override this to return 7514 * true for certain views if you are performing InputConnection proxying 7515 * to them. 7516 * @param view The View that is making the InputMethodManager call. 7517 * @return Return true to allow the call, false to reject. 7518 */ 7519 public boolean checkInputConnectionProxy(View view) { 7520 return false; 7521 } 7522 7523 /** 7524 * Show the context menu for this view. It is not safe to hold on to the 7525 * menu after returning from this method. 7526 * 7527 * You should normally not overload this method. Overload 7528 * {@link #onCreateContextMenu(ContextMenu)} or define an 7529 * {@link OnCreateContextMenuListener} to add items to the context menu. 7530 * 7531 * @param menu The context menu to populate 7532 */ 7533 public void createContextMenu(ContextMenu menu) { 7534 ContextMenuInfo menuInfo = getContextMenuInfo(); 7535 7536 // Sets the current menu info so all items added to menu will have 7537 // my extra info set. 7538 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7539 7540 onCreateContextMenu(menu); 7541 ListenerInfo li = mListenerInfo; 7542 if (li != null && li.mOnCreateContextMenuListener != null) { 7543 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7544 } 7545 7546 // Clear the extra information so subsequent items that aren't mine don't 7547 // have my extra info. 7548 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7549 7550 if (mParent != null) { 7551 mParent.createContextMenu(menu); 7552 } 7553 } 7554 7555 /** 7556 * Views should implement this if they have extra information to associate 7557 * with the context menu. The return result is supplied as a parameter to 7558 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7559 * callback. 7560 * 7561 * @return Extra information about the item for which the context menu 7562 * should be shown. This information will vary across different 7563 * subclasses of View. 7564 */ 7565 protected ContextMenuInfo getContextMenuInfo() { 7566 return null; 7567 } 7568 7569 /** 7570 * Views should implement this if the view itself is going to add items to 7571 * the context menu. 7572 * 7573 * @param menu the context menu to populate 7574 */ 7575 protected void onCreateContextMenu(ContextMenu menu) { 7576 } 7577 7578 /** 7579 * Implement this method to handle trackball motion events. The 7580 * <em>relative</em> movement of the trackball since the last event 7581 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7582 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7583 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7584 * they will often be fractional values, representing the more fine-grained 7585 * movement information available from a trackball). 7586 * 7587 * @param event The motion event. 7588 * @return True if the event was handled, false otherwise. 7589 */ 7590 public boolean onTrackballEvent(MotionEvent event) { 7591 return false; 7592 } 7593 7594 /** 7595 * Implement this method to handle generic motion events. 7596 * <p> 7597 * Generic motion events describe joystick movements, mouse hovers, track pad 7598 * touches, scroll wheel movements and other input events. The 7599 * {@link MotionEvent#getSource() source} of the motion event specifies 7600 * the class of input that was received. Implementations of this method 7601 * must examine the bits in the source before processing the event. 7602 * The following code example shows how this is done. 7603 * </p><p> 7604 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7605 * are delivered to the view under the pointer. All other generic motion events are 7606 * delivered to the focused view. 7607 * </p> 7608 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7609 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7610 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7611 * // process the joystick movement... 7612 * return true; 7613 * } 7614 * } 7615 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7616 * switch (event.getAction()) { 7617 * case MotionEvent.ACTION_HOVER_MOVE: 7618 * // process the mouse hover movement... 7619 * return true; 7620 * case MotionEvent.ACTION_SCROLL: 7621 * // process the scroll wheel movement... 7622 * return true; 7623 * } 7624 * } 7625 * return super.onGenericMotionEvent(event); 7626 * }</pre> 7627 * 7628 * @param event The generic motion event being processed. 7629 * @return True if the event was handled, false otherwise. 7630 */ 7631 public boolean onGenericMotionEvent(MotionEvent event) { 7632 return false; 7633 } 7634 7635 /** 7636 * Implement this method to handle hover events. 7637 * <p> 7638 * This method is called whenever a pointer is hovering into, over, or out of the 7639 * bounds of a view and the view is not currently being touched. 7640 * Hover events are represented as pointer events with action 7641 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7642 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7643 * </p> 7644 * <ul> 7645 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7646 * when the pointer enters the bounds of the view.</li> 7647 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7648 * when the pointer has already entered the bounds of the view and has moved.</li> 7649 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7650 * when the pointer has exited the bounds of the view or when the pointer is 7651 * about to go down due to a button click, tap, or similar user action that 7652 * causes the view to be touched.</li> 7653 * </ul> 7654 * <p> 7655 * The view should implement this method to return true to indicate that it is 7656 * handling the hover event, such as by changing its drawable state. 7657 * </p><p> 7658 * The default implementation calls {@link #setHovered} to update the hovered state 7659 * of the view when a hover enter or hover exit event is received, if the view 7660 * is enabled and is clickable. The default implementation also sends hover 7661 * accessibility events. 7662 * </p> 7663 * 7664 * @param event The motion event that describes the hover. 7665 * @return True if the view handled the hover event. 7666 * 7667 * @see #isHovered 7668 * @see #setHovered 7669 * @see #onHoverChanged 7670 */ 7671 public boolean onHoverEvent(MotionEvent event) { 7672 // The root view may receive hover (or touch) events that are outside the bounds of 7673 // the window. This code ensures that we only send accessibility events for 7674 // hovers that are actually within the bounds of the root view. 7675 final int action = event.getActionMasked(); 7676 if (!mSendingHoverAccessibilityEvents) { 7677 if ((action == MotionEvent.ACTION_HOVER_ENTER 7678 || action == MotionEvent.ACTION_HOVER_MOVE) 7679 && !hasHoveredChild() 7680 && pointInView(event.getX(), event.getY())) { 7681 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7682 mSendingHoverAccessibilityEvents = true; 7683 } 7684 } else { 7685 if (action == MotionEvent.ACTION_HOVER_EXIT 7686 || (action == MotionEvent.ACTION_MOVE 7687 && !pointInView(event.getX(), event.getY()))) { 7688 mSendingHoverAccessibilityEvents = false; 7689 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7690 // If the window does not have input focus we take away accessibility 7691 // focus as soon as the user stop hovering over the view. 7692 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7693 getViewRootImpl().setAccessibilityFocus(null, null); 7694 } 7695 } 7696 } 7697 7698 if (isHoverable()) { 7699 switch (action) { 7700 case MotionEvent.ACTION_HOVER_ENTER: 7701 setHovered(true); 7702 break; 7703 case MotionEvent.ACTION_HOVER_EXIT: 7704 setHovered(false); 7705 break; 7706 } 7707 7708 // Dispatch the event to onGenericMotionEvent before returning true. 7709 // This is to provide compatibility with existing applications that 7710 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7711 // break because of the new default handling for hoverable views 7712 // in onHoverEvent. 7713 // Note that onGenericMotionEvent will be called by default when 7714 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7715 dispatchGenericMotionEventInternal(event); 7716 return true; 7717 } 7718 7719 return false; 7720 } 7721 7722 /** 7723 * Returns true if the view should handle {@link #onHoverEvent} 7724 * by calling {@link #setHovered} to change its hovered state. 7725 * 7726 * @return True if the view is hoverable. 7727 */ 7728 private boolean isHoverable() { 7729 final int viewFlags = mViewFlags; 7730 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7731 return false; 7732 } 7733 7734 return (viewFlags & CLICKABLE) == CLICKABLE 7735 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7736 } 7737 7738 /** 7739 * Returns true if the view is currently hovered. 7740 * 7741 * @return True if the view is currently hovered. 7742 * 7743 * @see #setHovered 7744 * @see #onHoverChanged 7745 */ 7746 @ViewDebug.ExportedProperty 7747 public boolean isHovered() { 7748 return (mPrivateFlags & HOVERED) != 0; 7749 } 7750 7751 /** 7752 * Sets whether the view is currently hovered. 7753 * <p> 7754 * Calling this method also changes the drawable state of the view. This 7755 * enables the view to react to hover by using different drawable resources 7756 * to change its appearance. 7757 * </p><p> 7758 * The {@link #onHoverChanged} method is called when the hovered state changes. 7759 * </p> 7760 * 7761 * @param hovered True if the view is hovered. 7762 * 7763 * @see #isHovered 7764 * @see #onHoverChanged 7765 */ 7766 public void setHovered(boolean hovered) { 7767 if (hovered) { 7768 if ((mPrivateFlags & HOVERED) == 0) { 7769 mPrivateFlags |= HOVERED; 7770 refreshDrawableState(); 7771 onHoverChanged(true); 7772 } 7773 } else { 7774 if ((mPrivateFlags & HOVERED) != 0) { 7775 mPrivateFlags &= ~HOVERED; 7776 refreshDrawableState(); 7777 onHoverChanged(false); 7778 } 7779 } 7780 } 7781 7782 /** 7783 * Implement this method to handle hover state changes. 7784 * <p> 7785 * This method is called whenever the hover state changes as a result of a 7786 * call to {@link #setHovered}. 7787 * </p> 7788 * 7789 * @param hovered The current hover state, as returned by {@link #isHovered}. 7790 * 7791 * @see #isHovered 7792 * @see #setHovered 7793 */ 7794 public void onHoverChanged(boolean hovered) { 7795 } 7796 7797 /** 7798 * Implement this method to handle touch screen motion events. 7799 * 7800 * @param event The motion event. 7801 * @return True if the event was handled, false otherwise. 7802 */ 7803 public boolean onTouchEvent(MotionEvent event) { 7804 final int viewFlags = mViewFlags; 7805 7806 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7807 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7808 setPressed(false); 7809 } 7810 // A disabled view that is clickable still consumes the touch 7811 // events, it just doesn't respond to them. 7812 return (((viewFlags & CLICKABLE) == CLICKABLE || 7813 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7814 } 7815 7816 if (mTouchDelegate != null) { 7817 if (mTouchDelegate.onTouchEvent(event)) { 7818 return true; 7819 } 7820 } 7821 7822 if (((viewFlags & CLICKABLE) == CLICKABLE || 7823 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7824 switch (event.getAction()) { 7825 case MotionEvent.ACTION_UP: 7826 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7827 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7828 // take focus if we don't have it already and we should in 7829 // touch mode. 7830 boolean focusTaken = false; 7831 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7832 focusTaken = requestFocus(); 7833 } 7834 7835 if (prepressed) { 7836 // The button is being released before we actually 7837 // showed it as pressed. Make it show the pressed 7838 // state now (before scheduling the click) to ensure 7839 // the user sees it. 7840 setPressed(true); 7841 } 7842 7843 if (!mHasPerformedLongPress) { 7844 // This is a tap, so remove the longpress check 7845 removeLongPressCallback(); 7846 7847 // Only perform take click actions if we were in the pressed state 7848 if (!focusTaken) { 7849 // Use a Runnable and post this rather than calling 7850 // performClick directly. This lets other visual state 7851 // of the view update before click actions start. 7852 if (mPerformClick == null) { 7853 mPerformClick = new PerformClick(); 7854 } 7855 if (!post(mPerformClick)) { 7856 performClick(); 7857 } 7858 } 7859 } 7860 7861 if (mUnsetPressedState == null) { 7862 mUnsetPressedState = new UnsetPressedState(); 7863 } 7864 7865 if (prepressed) { 7866 postDelayed(mUnsetPressedState, 7867 ViewConfiguration.getPressedStateDuration()); 7868 } else if (!post(mUnsetPressedState)) { 7869 // If the post failed, unpress right now 7870 mUnsetPressedState.run(); 7871 } 7872 removeTapCallback(); 7873 } 7874 break; 7875 7876 case MotionEvent.ACTION_DOWN: 7877 mHasPerformedLongPress = false; 7878 7879 if (performButtonActionOnTouchDown(event)) { 7880 break; 7881 } 7882 7883 // Walk up the hierarchy to determine if we're inside a scrolling container. 7884 boolean isInScrollingContainer = isInScrollingContainer(); 7885 7886 // For views inside a scrolling container, delay the pressed feedback for 7887 // a short period in case this is a scroll. 7888 if (isInScrollingContainer) { 7889 mPrivateFlags |= PREPRESSED; 7890 if (mPendingCheckForTap == null) { 7891 mPendingCheckForTap = new CheckForTap(); 7892 } 7893 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7894 } else { 7895 // Not inside a scrolling container, so show the feedback right away 7896 setPressed(true); 7897 checkForLongClick(0); 7898 } 7899 break; 7900 7901 case MotionEvent.ACTION_CANCEL: 7902 setPressed(false); 7903 removeTapCallback(); 7904 break; 7905 7906 case MotionEvent.ACTION_MOVE: 7907 final int x = (int) event.getX(); 7908 final int y = (int) event.getY(); 7909 7910 // Be lenient about moving outside of buttons 7911 if (!pointInView(x, y, mTouchSlop)) { 7912 // Outside button 7913 removeTapCallback(); 7914 if ((mPrivateFlags & PRESSED) != 0) { 7915 // Remove any future long press/tap checks 7916 removeLongPressCallback(); 7917 7918 setPressed(false); 7919 } 7920 } 7921 break; 7922 } 7923 return true; 7924 } 7925 7926 return false; 7927 } 7928 7929 /** 7930 * @hide 7931 */ 7932 public boolean isInScrollingContainer() { 7933 ViewParent p = getParent(); 7934 while (p != null && p instanceof ViewGroup) { 7935 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7936 return true; 7937 } 7938 p = p.getParent(); 7939 } 7940 return false; 7941 } 7942 7943 /** 7944 * Remove the longpress detection timer. 7945 */ 7946 private void removeLongPressCallback() { 7947 if (mPendingCheckForLongPress != null) { 7948 removeCallbacks(mPendingCheckForLongPress); 7949 } 7950 } 7951 7952 /** 7953 * Remove the pending click action 7954 */ 7955 private void removePerformClickCallback() { 7956 if (mPerformClick != null) { 7957 removeCallbacks(mPerformClick); 7958 } 7959 } 7960 7961 /** 7962 * Remove the prepress detection timer. 7963 */ 7964 private void removeUnsetPressCallback() { 7965 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7966 setPressed(false); 7967 removeCallbacks(mUnsetPressedState); 7968 } 7969 } 7970 7971 /** 7972 * Remove the tap detection timer. 7973 */ 7974 private void removeTapCallback() { 7975 if (mPendingCheckForTap != null) { 7976 mPrivateFlags &= ~PREPRESSED; 7977 removeCallbacks(mPendingCheckForTap); 7978 } 7979 } 7980 7981 /** 7982 * Cancels a pending long press. Your subclass can use this if you 7983 * want the context menu to come up if the user presses and holds 7984 * at the same place, but you don't want it to come up if they press 7985 * and then move around enough to cause scrolling. 7986 */ 7987 public void cancelLongPress() { 7988 removeLongPressCallback(); 7989 7990 /* 7991 * The prepressed state handled by the tap callback is a display 7992 * construct, but the tap callback will post a long press callback 7993 * less its own timeout. Remove it here. 7994 */ 7995 removeTapCallback(); 7996 } 7997 7998 /** 7999 * Remove the pending callback for sending a 8000 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8001 */ 8002 private void removeSendViewScrolledAccessibilityEventCallback() { 8003 if (mSendViewScrolledAccessibilityEvent != null) { 8004 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8005 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8006 } 8007 } 8008 8009 /** 8010 * Sets the TouchDelegate for this View. 8011 */ 8012 public void setTouchDelegate(TouchDelegate delegate) { 8013 mTouchDelegate = delegate; 8014 } 8015 8016 /** 8017 * Gets the TouchDelegate for this View. 8018 */ 8019 public TouchDelegate getTouchDelegate() { 8020 return mTouchDelegate; 8021 } 8022 8023 /** 8024 * Set flags controlling behavior of this view. 8025 * 8026 * @param flags Constant indicating the value which should be set 8027 * @param mask Constant indicating the bit range that should be changed 8028 */ 8029 void setFlags(int flags, int mask) { 8030 int old = mViewFlags; 8031 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8032 8033 int changed = mViewFlags ^ old; 8034 if (changed == 0) { 8035 return; 8036 } 8037 int privateFlags = mPrivateFlags; 8038 8039 /* Check if the FOCUSABLE bit has changed */ 8040 if (((changed & FOCUSABLE_MASK) != 0) && 8041 ((privateFlags & HAS_BOUNDS) !=0)) { 8042 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8043 && ((privateFlags & FOCUSED) != 0)) { 8044 /* Give up focus if we are no longer focusable */ 8045 clearFocus(); 8046 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8047 && ((privateFlags & FOCUSED) == 0)) { 8048 /* 8049 * Tell the view system that we are now available to take focus 8050 * if no one else already has it. 8051 */ 8052 if (mParent != null) mParent.focusableViewAvailable(this); 8053 } 8054 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8055 notifyAccessibilityStateChanged(); 8056 } 8057 } 8058 8059 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8060 if ((changed & VISIBILITY_MASK) != 0) { 8061 /* 8062 * If this view is becoming visible, invalidate it in case it changed while 8063 * it was not visible. Marking it drawn ensures that the invalidation will 8064 * go through. 8065 */ 8066 mPrivateFlags |= DRAWN; 8067 invalidate(true); 8068 8069 needGlobalAttributesUpdate(true); 8070 8071 // a view becoming visible is worth notifying the parent 8072 // about in case nothing has focus. even if this specific view 8073 // isn't focusable, it may contain something that is, so let 8074 // the root view try to give this focus if nothing else does. 8075 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8076 mParent.focusableViewAvailable(this); 8077 } 8078 } 8079 } 8080 8081 /* Check if the GONE bit has changed */ 8082 if ((changed & GONE) != 0) { 8083 needGlobalAttributesUpdate(false); 8084 requestLayout(); 8085 8086 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8087 if (hasFocus()) clearFocus(); 8088 clearAccessibilityFocus(); 8089 destroyDrawingCache(); 8090 if (mParent instanceof View) { 8091 // GONE views noop invalidation, so invalidate the parent 8092 ((View) mParent).invalidate(true); 8093 } 8094 // Mark the view drawn to ensure that it gets invalidated properly the next 8095 // time it is visible and gets invalidated 8096 mPrivateFlags |= DRAWN; 8097 } 8098 if (mAttachInfo != null) { 8099 mAttachInfo.mViewVisibilityChanged = true; 8100 } 8101 } 8102 8103 /* Check if the VISIBLE bit has changed */ 8104 if ((changed & INVISIBLE) != 0) { 8105 needGlobalAttributesUpdate(false); 8106 /* 8107 * If this view is becoming invisible, set the DRAWN flag so that 8108 * the next invalidate() will not be skipped. 8109 */ 8110 mPrivateFlags |= DRAWN; 8111 8112 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8113 // root view becoming invisible shouldn't clear focus and accessibility focus 8114 if (getRootView() != this) { 8115 clearFocus(); 8116 clearAccessibilityFocus(); 8117 } 8118 } 8119 if (mAttachInfo != null) { 8120 mAttachInfo.mViewVisibilityChanged = true; 8121 } 8122 } 8123 8124 if ((changed & VISIBILITY_MASK) != 0) { 8125 if (mParent instanceof ViewGroup) { 8126 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8127 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8128 ((View) mParent).invalidate(true); 8129 } else if (mParent != null) { 8130 mParent.invalidateChild(this, null); 8131 } 8132 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8133 } 8134 8135 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8136 destroyDrawingCache(); 8137 } 8138 8139 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8140 destroyDrawingCache(); 8141 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8142 invalidateParentCaches(); 8143 } 8144 8145 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8146 destroyDrawingCache(); 8147 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8148 } 8149 8150 if ((changed & DRAW_MASK) != 0) { 8151 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8152 if (mBackground != null) { 8153 mPrivateFlags &= ~SKIP_DRAW; 8154 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8155 } else { 8156 mPrivateFlags |= SKIP_DRAW; 8157 } 8158 } else { 8159 mPrivateFlags &= ~SKIP_DRAW; 8160 } 8161 requestLayout(); 8162 invalidate(true); 8163 } 8164 8165 if ((changed & KEEP_SCREEN_ON) != 0) { 8166 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8167 mParent.recomputeViewAttributes(this); 8168 } 8169 } 8170 8171 if (AccessibilityManager.getInstance(mContext).isEnabled() 8172 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8173 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8174 notifyAccessibilityStateChanged(); 8175 } 8176 } 8177 8178 /** 8179 * Change the view's z order in the tree, so it's on top of other sibling 8180 * views 8181 */ 8182 public void bringToFront() { 8183 if (mParent != null) { 8184 mParent.bringChildToFront(this); 8185 } 8186 } 8187 8188 /** 8189 * This is called in response to an internal scroll in this view (i.e., the 8190 * view scrolled its own contents). This is typically as a result of 8191 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8192 * called. 8193 * 8194 * @param l Current horizontal scroll origin. 8195 * @param t Current vertical scroll origin. 8196 * @param oldl Previous horizontal scroll origin. 8197 * @param oldt Previous vertical scroll origin. 8198 */ 8199 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8200 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8201 postSendViewScrolledAccessibilityEventCallback(); 8202 } 8203 8204 mBackgroundSizeChanged = true; 8205 8206 final AttachInfo ai = mAttachInfo; 8207 if (ai != null) { 8208 ai.mViewScrollChanged = true; 8209 } 8210 } 8211 8212 /** 8213 * Interface definition for a callback to be invoked when the layout bounds of a view 8214 * changes due to layout processing. 8215 */ 8216 public interface OnLayoutChangeListener { 8217 /** 8218 * Called when the focus state of a view has changed. 8219 * 8220 * @param v The view whose state has changed. 8221 * @param left The new value of the view's left property. 8222 * @param top The new value of the view's top property. 8223 * @param right The new value of the view's right property. 8224 * @param bottom The new value of the view's bottom property. 8225 * @param oldLeft The previous value of the view's left property. 8226 * @param oldTop The previous value of the view's top property. 8227 * @param oldRight The previous value of the view's right property. 8228 * @param oldBottom The previous value of the view's bottom property. 8229 */ 8230 void onLayoutChange(View v, int left, int top, int right, int bottom, 8231 int oldLeft, int oldTop, int oldRight, int oldBottom); 8232 } 8233 8234 /** 8235 * This is called during layout when the size of this view has changed. If 8236 * you were just added to the view hierarchy, you're called with the old 8237 * values of 0. 8238 * 8239 * @param w Current width of this view. 8240 * @param h Current height of this view. 8241 * @param oldw Old width of this view. 8242 * @param oldh Old height of this view. 8243 */ 8244 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8245 } 8246 8247 /** 8248 * Called by draw to draw the child views. This may be overridden 8249 * by derived classes to gain control just before its children are drawn 8250 * (but after its own view has been drawn). 8251 * @param canvas the canvas on which to draw the view 8252 */ 8253 protected void dispatchDraw(Canvas canvas) { 8254 8255 } 8256 8257 /** 8258 * Gets the parent of this view. Note that the parent is a 8259 * ViewParent and not necessarily a View. 8260 * 8261 * @return Parent of this view. 8262 */ 8263 public final ViewParent getParent() { 8264 return mParent; 8265 } 8266 8267 /** 8268 * Set the horizontal scrolled position of your view. This will cause a call to 8269 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8270 * invalidated. 8271 * @param value the x position to scroll to 8272 */ 8273 public void setScrollX(int value) { 8274 scrollTo(value, mScrollY); 8275 } 8276 8277 /** 8278 * Set the vertical scrolled position of your view. This will cause a call to 8279 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8280 * invalidated. 8281 * @param value the y position to scroll to 8282 */ 8283 public void setScrollY(int value) { 8284 scrollTo(mScrollX, value); 8285 } 8286 8287 /** 8288 * Return the scrolled left position of this view. This is the left edge of 8289 * the displayed part of your view. You do not need to draw any pixels 8290 * farther left, since those are outside of the frame of your view on 8291 * screen. 8292 * 8293 * @return The left edge of the displayed part of your view, in pixels. 8294 */ 8295 public final int getScrollX() { 8296 return mScrollX; 8297 } 8298 8299 /** 8300 * Return the scrolled top position of this view. This is the top edge of 8301 * the displayed part of your view. You do not need to draw any pixels above 8302 * it, since those are outside of the frame of your view on screen. 8303 * 8304 * @return The top edge of the displayed part of your view, in pixels. 8305 */ 8306 public final int getScrollY() { 8307 return mScrollY; 8308 } 8309 8310 /** 8311 * Return the width of the your view. 8312 * 8313 * @return The width of your view, in pixels. 8314 */ 8315 @ViewDebug.ExportedProperty(category = "layout") 8316 public final int getWidth() { 8317 return mRight - mLeft; 8318 } 8319 8320 /** 8321 * Return the height of your view. 8322 * 8323 * @return The height of your view, in pixels. 8324 */ 8325 @ViewDebug.ExportedProperty(category = "layout") 8326 public final int getHeight() { 8327 return mBottom - mTop; 8328 } 8329 8330 /** 8331 * Return the visible drawing bounds of your view. Fills in the output 8332 * rectangle with the values from getScrollX(), getScrollY(), 8333 * getWidth(), and getHeight(). 8334 * 8335 * @param outRect The (scrolled) drawing bounds of the view. 8336 */ 8337 public void getDrawingRect(Rect outRect) { 8338 outRect.left = mScrollX; 8339 outRect.top = mScrollY; 8340 outRect.right = mScrollX + (mRight - mLeft); 8341 outRect.bottom = mScrollY + (mBottom - mTop); 8342 } 8343 8344 /** 8345 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8346 * raw width component (that is the result is masked by 8347 * {@link #MEASURED_SIZE_MASK}). 8348 * 8349 * @return The raw measured width of this view. 8350 */ 8351 public final int getMeasuredWidth() { 8352 return mMeasuredWidth & MEASURED_SIZE_MASK; 8353 } 8354 8355 /** 8356 * Return the full width measurement information for this view as computed 8357 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8358 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8359 * This should be used during measurement and layout calculations only. Use 8360 * {@link #getWidth()} to see how wide a view is after layout. 8361 * 8362 * @return The measured width of this view as a bit mask. 8363 */ 8364 public final int getMeasuredWidthAndState() { 8365 return mMeasuredWidth; 8366 } 8367 8368 /** 8369 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8370 * raw width component (that is the result is masked by 8371 * {@link #MEASURED_SIZE_MASK}). 8372 * 8373 * @return The raw measured height of this view. 8374 */ 8375 public final int getMeasuredHeight() { 8376 return mMeasuredHeight & MEASURED_SIZE_MASK; 8377 } 8378 8379 /** 8380 * Return the full height measurement information for this view as computed 8381 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8382 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8383 * This should be used during measurement and layout calculations only. Use 8384 * {@link #getHeight()} to see how wide a view is after layout. 8385 * 8386 * @return The measured width of this view as a bit mask. 8387 */ 8388 public final int getMeasuredHeightAndState() { 8389 return mMeasuredHeight; 8390 } 8391 8392 /** 8393 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8394 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8395 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8396 * and the height component is at the shifted bits 8397 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8398 */ 8399 public final int getMeasuredState() { 8400 return (mMeasuredWidth&MEASURED_STATE_MASK) 8401 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8402 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8403 } 8404 8405 /** 8406 * The transform matrix of this view, which is calculated based on the current 8407 * roation, scale, and pivot properties. 8408 * 8409 * @see #getRotation() 8410 * @see #getScaleX() 8411 * @see #getScaleY() 8412 * @see #getPivotX() 8413 * @see #getPivotY() 8414 * @return The current transform matrix for the view 8415 */ 8416 public Matrix getMatrix() { 8417 if (mTransformationInfo != null) { 8418 updateMatrix(); 8419 return mTransformationInfo.mMatrix; 8420 } 8421 return Matrix.IDENTITY_MATRIX; 8422 } 8423 8424 /** 8425 * Utility function to determine if the value is far enough away from zero to be 8426 * considered non-zero. 8427 * @param value A floating point value to check for zero-ness 8428 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8429 */ 8430 private static boolean nonzero(float value) { 8431 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8432 } 8433 8434 /** 8435 * Returns true if the transform matrix is the identity matrix. 8436 * Recomputes the matrix if necessary. 8437 * 8438 * @return True if the transform matrix is the identity matrix, false otherwise. 8439 */ 8440 final boolean hasIdentityMatrix() { 8441 if (mTransformationInfo != null) { 8442 updateMatrix(); 8443 return mTransformationInfo.mMatrixIsIdentity; 8444 } 8445 return true; 8446 } 8447 8448 void ensureTransformationInfo() { 8449 if (mTransformationInfo == null) { 8450 mTransformationInfo = new TransformationInfo(); 8451 } 8452 } 8453 8454 /** 8455 * Recomputes the transform matrix if necessary. 8456 */ 8457 private void updateMatrix() { 8458 final TransformationInfo info = mTransformationInfo; 8459 if (info == null) { 8460 return; 8461 } 8462 if (info.mMatrixDirty) { 8463 // transform-related properties have changed since the last time someone 8464 // asked for the matrix; recalculate it with the current values 8465 8466 // Figure out if we need to update the pivot point 8467 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8468 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8469 info.mPrevWidth = mRight - mLeft; 8470 info.mPrevHeight = mBottom - mTop; 8471 info.mPivotX = info.mPrevWidth / 2f; 8472 info.mPivotY = info.mPrevHeight / 2f; 8473 } 8474 } 8475 info.mMatrix.reset(); 8476 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8477 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8478 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8479 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8480 } else { 8481 if (info.mCamera == null) { 8482 info.mCamera = new Camera(); 8483 info.matrix3D = new Matrix(); 8484 } 8485 info.mCamera.save(); 8486 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8487 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8488 info.mCamera.getMatrix(info.matrix3D); 8489 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8490 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8491 info.mPivotY + info.mTranslationY); 8492 info.mMatrix.postConcat(info.matrix3D); 8493 info.mCamera.restore(); 8494 } 8495 info.mMatrixDirty = false; 8496 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8497 info.mInverseMatrixDirty = true; 8498 } 8499 } 8500 8501 /** 8502 * When searching for a view to focus this rectangle is used when considering if this view is 8503 * a good candidate for receiving focus. 8504 * 8505 * By default, the rectangle is the {@link #getDrawingRect}) of the view. 8506 * 8507 * @param r The rectangle to fill in, in this view's coordinates. 8508 */ 8509 public void getFocusRect(Rect r) { 8510 getDrawingRect(r); 8511 } 8512 8513 /** 8514 * Utility method to retrieve the inverse of the current mMatrix property. 8515 * We cache the matrix to avoid recalculating it when transform properties 8516 * have not changed. 8517 * 8518 * @return The inverse of the current matrix of this view. 8519 */ 8520 final Matrix getInverseMatrix() { 8521 final TransformationInfo info = mTransformationInfo; 8522 if (info != null) { 8523 updateMatrix(); 8524 if (info.mInverseMatrixDirty) { 8525 if (info.mInverseMatrix == null) { 8526 info.mInverseMatrix = new Matrix(); 8527 } 8528 info.mMatrix.invert(info.mInverseMatrix); 8529 info.mInverseMatrixDirty = false; 8530 } 8531 return info.mInverseMatrix; 8532 } 8533 return Matrix.IDENTITY_MATRIX; 8534 } 8535 8536 /** 8537 * Gets the distance along the Z axis from the camera to this view. 8538 * 8539 * @see #setCameraDistance(float) 8540 * 8541 * @return The distance along the Z axis. 8542 */ 8543 public float getCameraDistance() { 8544 ensureTransformationInfo(); 8545 final float dpi = mResources.getDisplayMetrics().densityDpi; 8546 final TransformationInfo info = mTransformationInfo; 8547 if (info.mCamera == null) { 8548 info.mCamera = new Camera(); 8549 info.matrix3D = new Matrix(); 8550 } 8551 return -(info.mCamera.getLocationZ() * dpi); 8552 } 8553 8554 /** 8555 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8556 * views are drawn) from the camera to this view. The camera's distance 8557 * affects 3D transformations, for instance rotations around the X and Y 8558 * axis. If the rotationX or rotationY properties are changed and this view is 8559 * large (more than half the size of the screen), it is recommended to always 8560 * use a camera distance that's greater than the height (X axis rotation) or 8561 * the width (Y axis rotation) of this view.</p> 8562 * 8563 * <p>The distance of the camera from the view plane can have an affect on the 8564 * perspective distortion of the view when it is rotated around the x or y axis. 8565 * For example, a large distance will result in a large viewing angle, and there 8566 * will not be much perspective distortion of the view as it rotates. A short 8567 * distance may cause much more perspective distortion upon rotation, and can 8568 * also result in some drawing artifacts if the rotated view ends up partially 8569 * behind the camera (which is why the recommendation is to use a distance at 8570 * least as far as the size of the view, if the view is to be rotated.)</p> 8571 * 8572 * <p>The distance is expressed in "depth pixels." The default distance depends 8573 * on the screen density. For instance, on a medium density display, the 8574 * default distance is 1280. On a high density display, the default distance 8575 * is 1920.</p> 8576 * 8577 * <p>If you want to specify a distance that leads to visually consistent 8578 * results across various densities, use the following formula:</p> 8579 * <pre> 8580 * float scale = context.getResources().getDisplayMetrics().density; 8581 * view.setCameraDistance(distance * scale); 8582 * </pre> 8583 * 8584 * <p>The density scale factor of a high density display is 1.5, 8585 * and 1920 = 1280 * 1.5.</p> 8586 * 8587 * @param distance The distance in "depth pixels", if negative the opposite 8588 * value is used 8589 * 8590 * @see #setRotationX(float) 8591 * @see #setRotationY(float) 8592 */ 8593 public void setCameraDistance(float distance) { 8594 invalidateViewProperty(true, false); 8595 8596 ensureTransformationInfo(); 8597 final float dpi = mResources.getDisplayMetrics().densityDpi; 8598 final TransformationInfo info = mTransformationInfo; 8599 if (info.mCamera == null) { 8600 info.mCamera = new Camera(); 8601 info.matrix3D = new Matrix(); 8602 } 8603 8604 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8605 info.mMatrixDirty = true; 8606 8607 invalidateViewProperty(false, false); 8608 if (mDisplayList != null) { 8609 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8610 } 8611 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8612 // View was rejected last time it was drawn by its parent; this may have changed 8613 invalidateParentIfNeeded(); 8614 } 8615 } 8616 8617 /** 8618 * The degrees that the view is rotated around the pivot point. 8619 * 8620 * @see #setRotation(float) 8621 * @see #getPivotX() 8622 * @see #getPivotY() 8623 * 8624 * @return The degrees of rotation. 8625 */ 8626 @ViewDebug.ExportedProperty(category = "drawing") 8627 public float getRotation() { 8628 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8629 } 8630 8631 /** 8632 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8633 * result in clockwise rotation. 8634 * 8635 * @param rotation The degrees of rotation. 8636 * 8637 * @see #getRotation() 8638 * @see #getPivotX() 8639 * @see #getPivotY() 8640 * @see #setRotationX(float) 8641 * @see #setRotationY(float) 8642 * 8643 * @attr ref android.R.styleable#View_rotation 8644 */ 8645 public void setRotation(float rotation) { 8646 ensureTransformationInfo(); 8647 final TransformationInfo info = mTransformationInfo; 8648 if (info.mRotation != rotation) { 8649 // Double-invalidation is necessary to capture view's old and new areas 8650 invalidateViewProperty(true, false); 8651 info.mRotation = rotation; 8652 info.mMatrixDirty = true; 8653 invalidateViewProperty(false, true); 8654 if (mDisplayList != null) { 8655 mDisplayList.setRotation(rotation); 8656 } 8657 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8658 // View was rejected last time it was drawn by its parent; this may have changed 8659 invalidateParentIfNeeded(); 8660 } 8661 } 8662 } 8663 8664 /** 8665 * The degrees that the view is rotated around the vertical axis through the pivot point. 8666 * 8667 * @see #getPivotX() 8668 * @see #getPivotY() 8669 * @see #setRotationY(float) 8670 * 8671 * @return The degrees of Y rotation. 8672 */ 8673 @ViewDebug.ExportedProperty(category = "drawing") 8674 public float getRotationY() { 8675 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8676 } 8677 8678 /** 8679 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8680 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8681 * down the y axis. 8682 * 8683 * When rotating large views, it is recommended to adjust the camera distance 8684 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8685 * 8686 * @param rotationY The degrees of Y rotation. 8687 * 8688 * @see #getRotationY() 8689 * @see #getPivotX() 8690 * @see #getPivotY() 8691 * @see #setRotation(float) 8692 * @see #setRotationX(float) 8693 * @see #setCameraDistance(float) 8694 * 8695 * @attr ref android.R.styleable#View_rotationY 8696 */ 8697 public void setRotationY(float rotationY) { 8698 ensureTransformationInfo(); 8699 final TransformationInfo info = mTransformationInfo; 8700 if (info.mRotationY != rotationY) { 8701 invalidateViewProperty(true, false); 8702 info.mRotationY = rotationY; 8703 info.mMatrixDirty = true; 8704 invalidateViewProperty(false, true); 8705 if (mDisplayList != null) { 8706 mDisplayList.setRotationY(rotationY); 8707 } 8708 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8709 // View was rejected last time it was drawn by its parent; this may have changed 8710 invalidateParentIfNeeded(); 8711 } 8712 } 8713 } 8714 8715 /** 8716 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8717 * 8718 * @see #getPivotX() 8719 * @see #getPivotY() 8720 * @see #setRotationX(float) 8721 * 8722 * @return The degrees of X rotation. 8723 */ 8724 @ViewDebug.ExportedProperty(category = "drawing") 8725 public float getRotationX() { 8726 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8727 } 8728 8729 /** 8730 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8731 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8732 * x axis. 8733 * 8734 * When rotating large views, it is recommended to adjust the camera distance 8735 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8736 * 8737 * @param rotationX The degrees of X rotation. 8738 * 8739 * @see #getRotationX() 8740 * @see #getPivotX() 8741 * @see #getPivotY() 8742 * @see #setRotation(float) 8743 * @see #setRotationY(float) 8744 * @see #setCameraDistance(float) 8745 * 8746 * @attr ref android.R.styleable#View_rotationX 8747 */ 8748 public void setRotationX(float rotationX) { 8749 ensureTransformationInfo(); 8750 final TransformationInfo info = mTransformationInfo; 8751 if (info.mRotationX != rotationX) { 8752 invalidateViewProperty(true, false); 8753 info.mRotationX = rotationX; 8754 info.mMatrixDirty = true; 8755 invalidateViewProperty(false, true); 8756 if (mDisplayList != null) { 8757 mDisplayList.setRotationX(rotationX); 8758 } 8759 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8760 // View was rejected last time it was drawn by its parent; this may have changed 8761 invalidateParentIfNeeded(); 8762 } 8763 } 8764 } 8765 8766 /** 8767 * The amount that the view is scaled in x around the pivot point, as a proportion of 8768 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8769 * 8770 * <p>By default, this is 1.0f. 8771 * 8772 * @see #getPivotX() 8773 * @see #getPivotY() 8774 * @return The scaling factor. 8775 */ 8776 @ViewDebug.ExportedProperty(category = "drawing") 8777 public float getScaleX() { 8778 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8779 } 8780 8781 /** 8782 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8783 * the view's unscaled width. A value of 1 means that no scaling is applied. 8784 * 8785 * @param scaleX The scaling factor. 8786 * @see #getPivotX() 8787 * @see #getPivotY() 8788 * 8789 * @attr ref android.R.styleable#View_scaleX 8790 */ 8791 public void setScaleX(float scaleX) { 8792 ensureTransformationInfo(); 8793 final TransformationInfo info = mTransformationInfo; 8794 if (info.mScaleX != scaleX) { 8795 invalidateViewProperty(true, false); 8796 info.mScaleX = scaleX; 8797 info.mMatrixDirty = true; 8798 invalidateViewProperty(false, true); 8799 if (mDisplayList != null) { 8800 mDisplayList.setScaleX(scaleX); 8801 } 8802 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8803 // View was rejected last time it was drawn by its parent; this may have changed 8804 invalidateParentIfNeeded(); 8805 } 8806 } 8807 } 8808 8809 /** 8810 * The amount that the view is scaled in y around the pivot point, as a proportion of 8811 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8812 * 8813 * <p>By default, this is 1.0f. 8814 * 8815 * @see #getPivotX() 8816 * @see #getPivotY() 8817 * @return The scaling factor. 8818 */ 8819 @ViewDebug.ExportedProperty(category = "drawing") 8820 public float getScaleY() { 8821 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8822 } 8823 8824 /** 8825 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8826 * the view's unscaled width. A value of 1 means that no scaling is applied. 8827 * 8828 * @param scaleY The scaling factor. 8829 * @see #getPivotX() 8830 * @see #getPivotY() 8831 * 8832 * @attr ref android.R.styleable#View_scaleY 8833 */ 8834 public void setScaleY(float scaleY) { 8835 ensureTransformationInfo(); 8836 final TransformationInfo info = mTransformationInfo; 8837 if (info.mScaleY != scaleY) { 8838 invalidateViewProperty(true, false); 8839 info.mScaleY = scaleY; 8840 info.mMatrixDirty = true; 8841 invalidateViewProperty(false, true); 8842 if (mDisplayList != null) { 8843 mDisplayList.setScaleY(scaleY); 8844 } 8845 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8846 // View was rejected last time it was drawn by its parent; this may have changed 8847 invalidateParentIfNeeded(); 8848 } 8849 } 8850 } 8851 8852 /** 8853 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8854 * and {@link #setScaleX(float) scaled}. 8855 * 8856 * @see #getRotation() 8857 * @see #getScaleX() 8858 * @see #getScaleY() 8859 * @see #getPivotY() 8860 * @return The x location of the pivot point. 8861 * 8862 * @attr ref android.R.styleable#View_transformPivotX 8863 */ 8864 @ViewDebug.ExportedProperty(category = "drawing") 8865 public float getPivotX() { 8866 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8867 } 8868 8869 /** 8870 * Sets the x location of the point around which the view is 8871 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8872 * By default, the pivot point is centered on the object. 8873 * Setting this property disables this behavior and causes the view to use only the 8874 * explicitly set pivotX and pivotY values. 8875 * 8876 * @param pivotX The x location of the pivot point. 8877 * @see #getRotation() 8878 * @see #getScaleX() 8879 * @see #getScaleY() 8880 * @see #getPivotY() 8881 * 8882 * @attr ref android.R.styleable#View_transformPivotX 8883 */ 8884 public void setPivotX(float pivotX) { 8885 ensureTransformationInfo(); 8886 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8887 final TransformationInfo info = mTransformationInfo; 8888 if (info.mPivotX != pivotX) { 8889 invalidateViewProperty(true, false); 8890 info.mPivotX = pivotX; 8891 info.mMatrixDirty = true; 8892 invalidateViewProperty(false, true); 8893 if (mDisplayList != null) { 8894 mDisplayList.setPivotX(pivotX); 8895 } 8896 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8897 // View was rejected last time it was drawn by its parent; this may have changed 8898 invalidateParentIfNeeded(); 8899 } 8900 } 8901 } 8902 8903 /** 8904 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8905 * and {@link #setScaleY(float) scaled}. 8906 * 8907 * @see #getRotation() 8908 * @see #getScaleX() 8909 * @see #getScaleY() 8910 * @see #getPivotY() 8911 * @return The y location of the pivot point. 8912 * 8913 * @attr ref android.R.styleable#View_transformPivotY 8914 */ 8915 @ViewDebug.ExportedProperty(category = "drawing") 8916 public float getPivotY() { 8917 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8918 } 8919 8920 /** 8921 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8922 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8923 * Setting this property disables this behavior and causes the view to use only the 8924 * explicitly set pivotX and pivotY values. 8925 * 8926 * @param pivotY The y location of the pivot point. 8927 * @see #getRotation() 8928 * @see #getScaleX() 8929 * @see #getScaleY() 8930 * @see #getPivotY() 8931 * 8932 * @attr ref android.R.styleable#View_transformPivotY 8933 */ 8934 public void setPivotY(float pivotY) { 8935 ensureTransformationInfo(); 8936 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8937 final TransformationInfo info = mTransformationInfo; 8938 if (info.mPivotY != pivotY) { 8939 invalidateViewProperty(true, false); 8940 info.mPivotY = pivotY; 8941 info.mMatrixDirty = true; 8942 invalidateViewProperty(false, true); 8943 if (mDisplayList != null) { 8944 mDisplayList.setPivotY(pivotY); 8945 } 8946 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8947 // View was rejected last time it was drawn by its parent; this may have changed 8948 invalidateParentIfNeeded(); 8949 } 8950 } 8951 } 8952 8953 /** 8954 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8955 * completely transparent and 1 means the view is completely opaque. 8956 * 8957 * <p>By default this is 1.0f. 8958 * @return The opacity of the view. 8959 */ 8960 @ViewDebug.ExportedProperty(category = "drawing") 8961 public float getAlpha() { 8962 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8963 } 8964 8965 /** 8966 * Returns whether this View has content which overlaps. This function, intended to be 8967 * overridden by specific View types, is an optimization when alpha is set on a view. If 8968 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8969 * and then composited it into place, which can be expensive. If the view has no overlapping 8970 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8971 * An example of overlapping rendering is a TextView with a background image, such as a 8972 * Button. An example of non-overlapping rendering is a TextView with no background, or 8973 * an ImageView with only the foreground image. The default implementation returns true; 8974 * subclasses should override if they have cases which can be optimized. 8975 * 8976 * @return true if the content in this view might overlap, false otherwise. 8977 */ 8978 public boolean hasOverlappingRendering() { 8979 return true; 8980 } 8981 8982 /** 8983 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8984 * completely transparent and 1 means the view is completely opaque.</p> 8985 * 8986 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8987 * responsible for applying the opacity itself. Otherwise, calling this method is 8988 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8989 * setting a hardware layer.</p> 8990 * 8991 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8992 * performance implications. It is generally best to use the alpha property sparingly and 8993 * transiently, as in the case of fading animations.</p> 8994 * 8995 * @param alpha The opacity of the view. 8996 * 8997 * @see #setLayerType(int, android.graphics.Paint) 8998 * 8999 * @attr ref android.R.styleable#View_alpha 9000 */ 9001 public void setAlpha(float alpha) { 9002 ensureTransformationInfo(); 9003 if (mTransformationInfo.mAlpha != alpha) { 9004 mTransformationInfo.mAlpha = alpha; 9005 if (onSetAlpha((int) (alpha * 255))) { 9006 mPrivateFlags |= ALPHA_SET; 9007 // subclass is handling alpha - don't optimize rendering cache invalidation 9008 invalidateParentCaches(); 9009 invalidate(true); 9010 } else { 9011 mPrivateFlags &= ~ALPHA_SET; 9012 invalidateViewProperty(true, false); 9013 if (mDisplayList != null) { 9014 mDisplayList.setAlpha(alpha); 9015 } 9016 } 9017 } 9018 } 9019 9020 /** 9021 * Faster version of setAlpha() which performs the same steps except there are 9022 * no calls to invalidate(). The caller of this function should perform proper invalidation 9023 * on the parent and this object. The return value indicates whether the subclass handles 9024 * alpha (the return value for onSetAlpha()). 9025 * 9026 * @param alpha The new value for the alpha property 9027 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9028 * the new value for the alpha property is different from the old value 9029 */ 9030 boolean setAlphaNoInvalidation(float alpha) { 9031 ensureTransformationInfo(); 9032 if (mTransformationInfo.mAlpha != alpha) { 9033 mTransformationInfo.mAlpha = alpha; 9034 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9035 if (subclassHandlesAlpha) { 9036 mPrivateFlags |= ALPHA_SET; 9037 return true; 9038 } else { 9039 mPrivateFlags &= ~ALPHA_SET; 9040 if (mDisplayList != null) { 9041 mDisplayList.setAlpha(alpha); 9042 } 9043 } 9044 } 9045 return false; 9046 } 9047 9048 /** 9049 * Top position of this view relative to its parent. 9050 * 9051 * @return The top of this view, in pixels. 9052 */ 9053 @ViewDebug.CapturedViewProperty 9054 public final int getTop() { 9055 return mTop; 9056 } 9057 9058 /** 9059 * Sets the top position of this view relative to its parent. This method is meant to be called 9060 * by the layout system and should not generally be called otherwise, because the property 9061 * may be changed at any time by the layout. 9062 * 9063 * @param top The top of this view, in pixels. 9064 */ 9065 public final void setTop(int top) { 9066 if (top != mTop) { 9067 updateMatrix(); 9068 final boolean matrixIsIdentity = mTransformationInfo == null 9069 || mTransformationInfo.mMatrixIsIdentity; 9070 if (matrixIsIdentity) { 9071 if (mAttachInfo != null) { 9072 int minTop; 9073 int yLoc; 9074 if (top < mTop) { 9075 minTop = top; 9076 yLoc = top - mTop; 9077 } else { 9078 minTop = mTop; 9079 yLoc = 0; 9080 } 9081 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9082 } 9083 } else { 9084 // Double-invalidation is necessary to capture view's old and new areas 9085 invalidate(true); 9086 } 9087 9088 int width = mRight - mLeft; 9089 int oldHeight = mBottom - mTop; 9090 9091 mTop = top; 9092 if (mDisplayList != null) { 9093 mDisplayList.setTop(mTop); 9094 } 9095 9096 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9097 9098 if (!matrixIsIdentity) { 9099 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9100 // A change in dimension means an auto-centered pivot point changes, too 9101 mTransformationInfo.mMatrixDirty = true; 9102 } 9103 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9104 invalidate(true); 9105 } 9106 mBackgroundSizeChanged = true; 9107 invalidateParentIfNeeded(); 9108 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9109 // View was rejected last time it was drawn by its parent; this may have changed 9110 invalidateParentIfNeeded(); 9111 } 9112 } 9113 } 9114 9115 /** 9116 * Bottom position of this view relative to its parent. 9117 * 9118 * @return The bottom of this view, in pixels. 9119 */ 9120 @ViewDebug.CapturedViewProperty 9121 public final int getBottom() { 9122 return mBottom; 9123 } 9124 9125 /** 9126 * True if this view has changed since the last time being drawn. 9127 * 9128 * @return The dirty state of this view. 9129 */ 9130 public boolean isDirty() { 9131 return (mPrivateFlags & DIRTY_MASK) != 0; 9132 } 9133 9134 /** 9135 * Sets the bottom position of this view relative to its parent. This method is meant to be 9136 * called by the layout system and should not generally be called otherwise, because the 9137 * property may be changed at any time by the layout. 9138 * 9139 * @param bottom The bottom of this view, in pixels. 9140 */ 9141 public final void setBottom(int bottom) { 9142 if (bottom != mBottom) { 9143 updateMatrix(); 9144 final boolean matrixIsIdentity = mTransformationInfo == null 9145 || mTransformationInfo.mMatrixIsIdentity; 9146 if (matrixIsIdentity) { 9147 if (mAttachInfo != null) { 9148 int maxBottom; 9149 if (bottom < mBottom) { 9150 maxBottom = mBottom; 9151 } else { 9152 maxBottom = bottom; 9153 } 9154 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9155 } 9156 } else { 9157 // Double-invalidation is necessary to capture view's old and new areas 9158 invalidate(true); 9159 } 9160 9161 int width = mRight - mLeft; 9162 int oldHeight = mBottom - mTop; 9163 9164 mBottom = bottom; 9165 if (mDisplayList != null) { 9166 mDisplayList.setBottom(mBottom); 9167 } 9168 9169 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9170 9171 if (!matrixIsIdentity) { 9172 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9173 // A change in dimension means an auto-centered pivot point changes, too 9174 mTransformationInfo.mMatrixDirty = true; 9175 } 9176 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9177 invalidate(true); 9178 } 9179 mBackgroundSizeChanged = true; 9180 invalidateParentIfNeeded(); 9181 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9182 // View was rejected last time it was drawn by its parent; this may have changed 9183 invalidateParentIfNeeded(); 9184 } 9185 } 9186 } 9187 9188 /** 9189 * Left position of this view relative to its parent. 9190 * 9191 * @return The left edge of this view, in pixels. 9192 */ 9193 @ViewDebug.CapturedViewProperty 9194 public final int getLeft() { 9195 return mLeft; 9196 } 9197 9198 /** 9199 * Sets the left position of this view relative to its parent. This method is meant to be called 9200 * by the layout system and should not generally be called otherwise, because the property 9201 * may be changed at any time by the layout. 9202 * 9203 * @param left The bottom of this view, in pixels. 9204 */ 9205 public final void setLeft(int left) { 9206 if (left != mLeft) { 9207 updateMatrix(); 9208 final boolean matrixIsIdentity = mTransformationInfo == null 9209 || mTransformationInfo.mMatrixIsIdentity; 9210 if (matrixIsIdentity) { 9211 if (mAttachInfo != null) { 9212 int minLeft; 9213 int xLoc; 9214 if (left < mLeft) { 9215 minLeft = left; 9216 xLoc = left - mLeft; 9217 } else { 9218 minLeft = mLeft; 9219 xLoc = 0; 9220 } 9221 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9222 } 9223 } else { 9224 // Double-invalidation is necessary to capture view's old and new areas 9225 invalidate(true); 9226 } 9227 9228 int oldWidth = mRight - mLeft; 9229 int height = mBottom - mTop; 9230 9231 mLeft = left; 9232 if (mDisplayList != null) { 9233 mDisplayList.setLeft(left); 9234 } 9235 9236 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9237 9238 if (!matrixIsIdentity) { 9239 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9240 // A change in dimension means an auto-centered pivot point changes, too 9241 mTransformationInfo.mMatrixDirty = true; 9242 } 9243 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9244 invalidate(true); 9245 } 9246 mBackgroundSizeChanged = true; 9247 invalidateParentIfNeeded(); 9248 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9249 // View was rejected last time it was drawn by its parent; this may have changed 9250 invalidateParentIfNeeded(); 9251 } 9252 } 9253 } 9254 9255 /** 9256 * Right position of this view relative to its parent. 9257 * 9258 * @return The right edge of this view, in pixels. 9259 */ 9260 @ViewDebug.CapturedViewProperty 9261 public final int getRight() { 9262 return mRight; 9263 } 9264 9265 /** 9266 * Sets the right position of this view relative to its parent. This method is meant to be called 9267 * by the layout system and should not generally be called otherwise, because the property 9268 * may be changed at any time by the layout. 9269 * 9270 * @param right The bottom of this view, in pixels. 9271 */ 9272 public final void setRight(int right) { 9273 if (right != mRight) { 9274 updateMatrix(); 9275 final boolean matrixIsIdentity = mTransformationInfo == null 9276 || mTransformationInfo.mMatrixIsIdentity; 9277 if (matrixIsIdentity) { 9278 if (mAttachInfo != null) { 9279 int maxRight; 9280 if (right < mRight) { 9281 maxRight = mRight; 9282 } else { 9283 maxRight = right; 9284 } 9285 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9286 } 9287 } else { 9288 // Double-invalidation is necessary to capture view's old and new areas 9289 invalidate(true); 9290 } 9291 9292 int oldWidth = mRight - mLeft; 9293 int height = mBottom - mTop; 9294 9295 mRight = right; 9296 if (mDisplayList != null) { 9297 mDisplayList.setRight(mRight); 9298 } 9299 9300 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9301 9302 if (!matrixIsIdentity) { 9303 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9304 // A change in dimension means an auto-centered pivot point changes, too 9305 mTransformationInfo.mMatrixDirty = true; 9306 } 9307 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9308 invalidate(true); 9309 } 9310 mBackgroundSizeChanged = true; 9311 invalidateParentIfNeeded(); 9312 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9313 // View was rejected last time it was drawn by its parent; this may have changed 9314 invalidateParentIfNeeded(); 9315 } 9316 } 9317 } 9318 9319 /** 9320 * The visual x position of this view, in pixels. This is equivalent to the 9321 * {@link #setTranslationX(float) translationX} property plus the current 9322 * {@link #getLeft() left} property. 9323 * 9324 * @return The visual x position of this view, in pixels. 9325 */ 9326 @ViewDebug.ExportedProperty(category = "drawing") 9327 public float getX() { 9328 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9329 } 9330 9331 /** 9332 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9333 * {@link #setTranslationX(float) translationX} property to be the difference between 9334 * the x value passed in and the current {@link #getLeft() left} property. 9335 * 9336 * @param x The visual x position of this view, in pixels. 9337 */ 9338 public void setX(float x) { 9339 setTranslationX(x - mLeft); 9340 } 9341 9342 /** 9343 * The visual y position of this view, in pixels. This is equivalent to the 9344 * {@link #setTranslationY(float) translationY} property plus the current 9345 * {@link #getTop() top} property. 9346 * 9347 * @return The visual y position of this view, in pixels. 9348 */ 9349 @ViewDebug.ExportedProperty(category = "drawing") 9350 public float getY() { 9351 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9352 } 9353 9354 /** 9355 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9356 * {@link #setTranslationY(float) translationY} property to be the difference between 9357 * the y value passed in and the current {@link #getTop() top} property. 9358 * 9359 * @param y The visual y position of this view, in pixels. 9360 */ 9361 public void setY(float y) { 9362 setTranslationY(y - mTop); 9363 } 9364 9365 9366 /** 9367 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9368 * This position is post-layout, in addition to wherever the object's 9369 * layout placed it. 9370 * 9371 * @return The horizontal position of this view relative to its left position, in pixels. 9372 */ 9373 @ViewDebug.ExportedProperty(category = "drawing") 9374 public float getTranslationX() { 9375 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9376 } 9377 9378 /** 9379 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9380 * This effectively positions the object post-layout, in addition to wherever the object's 9381 * layout placed it. 9382 * 9383 * @param translationX The horizontal position of this view relative to its left position, 9384 * in pixels. 9385 * 9386 * @attr ref android.R.styleable#View_translationX 9387 */ 9388 public void setTranslationX(float translationX) { 9389 ensureTransformationInfo(); 9390 final TransformationInfo info = mTransformationInfo; 9391 if (info.mTranslationX != translationX) { 9392 // Double-invalidation is necessary to capture view's old and new areas 9393 invalidateViewProperty(true, false); 9394 info.mTranslationX = translationX; 9395 info.mMatrixDirty = true; 9396 invalidateViewProperty(false, true); 9397 if (mDisplayList != null) { 9398 mDisplayList.setTranslationX(translationX); 9399 } 9400 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9401 // View was rejected last time it was drawn by its parent; this may have changed 9402 invalidateParentIfNeeded(); 9403 } 9404 } 9405 } 9406 9407 /** 9408 * The horizontal location of this view relative to its {@link #getTop() top} position. 9409 * This position is post-layout, in addition to wherever the object's 9410 * layout placed it. 9411 * 9412 * @return The vertical position of this view relative to its top position, 9413 * in pixels. 9414 */ 9415 @ViewDebug.ExportedProperty(category = "drawing") 9416 public float getTranslationY() { 9417 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9418 } 9419 9420 /** 9421 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9422 * This effectively positions the object post-layout, in addition to wherever the object's 9423 * layout placed it. 9424 * 9425 * @param translationY The vertical position of this view relative to its top position, 9426 * in pixels. 9427 * 9428 * @attr ref android.R.styleable#View_translationY 9429 */ 9430 public void setTranslationY(float translationY) { 9431 ensureTransformationInfo(); 9432 final TransformationInfo info = mTransformationInfo; 9433 if (info.mTranslationY != translationY) { 9434 invalidateViewProperty(true, false); 9435 info.mTranslationY = translationY; 9436 info.mMatrixDirty = true; 9437 invalidateViewProperty(false, true); 9438 if (mDisplayList != null) { 9439 mDisplayList.setTranslationY(translationY); 9440 } 9441 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9442 // View was rejected last time it was drawn by its parent; this may have changed 9443 invalidateParentIfNeeded(); 9444 } 9445 } 9446 } 9447 9448 /** 9449 * Hit rectangle in parent's coordinates 9450 * 9451 * @param outRect The hit rectangle of the view. 9452 */ 9453 public void getHitRect(Rect outRect) { 9454 updateMatrix(); 9455 final TransformationInfo info = mTransformationInfo; 9456 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9457 outRect.set(mLeft, mTop, mRight, mBottom); 9458 } else { 9459 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9460 tmpRect.set(-info.mPivotX, -info.mPivotY, 9461 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9462 info.mMatrix.mapRect(tmpRect); 9463 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9464 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9465 } 9466 } 9467 9468 /** 9469 * Determines whether the given point, in local coordinates is inside the view. 9470 */ 9471 /*package*/ final boolean pointInView(float localX, float localY) { 9472 return localX >= 0 && localX < (mRight - mLeft) 9473 && localY >= 0 && localY < (mBottom - mTop); 9474 } 9475 9476 /** 9477 * Utility method to determine whether the given point, in local coordinates, 9478 * is inside the view, where the area of the view is expanded by the slop factor. 9479 * This method is called while processing touch-move events to determine if the event 9480 * is still within the view. 9481 */ 9482 private boolean pointInView(float localX, float localY, float slop) { 9483 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9484 localY < ((mBottom - mTop) + slop); 9485 } 9486 9487 /** 9488 * When a view has focus and the user navigates away from it, the next view is searched for 9489 * starting from the rectangle filled in by this method. 9490 * 9491 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9492 * of the view. However, if your view maintains some idea of internal selection, 9493 * such as a cursor, or a selected row or column, you should override this method and 9494 * fill in a more specific rectangle. 9495 * 9496 * @param r The rectangle to fill in, in this view's coordinates. 9497 */ 9498 public void getFocusedRect(Rect r) { 9499 getDrawingRect(r); 9500 } 9501 9502 /** 9503 * If some part of this view is not clipped by any of its parents, then 9504 * return that area in r in global (root) coordinates. To convert r to local 9505 * coordinates (without taking possible View rotations into account), offset 9506 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9507 * If the view is completely clipped or translated out, return false. 9508 * 9509 * @param r If true is returned, r holds the global coordinates of the 9510 * visible portion of this view. 9511 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9512 * between this view and its root. globalOffet may be null. 9513 * @return true if r is non-empty (i.e. part of the view is visible at the 9514 * root level. 9515 */ 9516 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9517 int width = mRight - mLeft; 9518 int height = mBottom - mTop; 9519 if (width > 0 && height > 0) { 9520 r.set(0, 0, width, height); 9521 if (globalOffset != null) { 9522 globalOffset.set(-mScrollX, -mScrollY); 9523 } 9524 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9525 } 9526 return false; 9527 } 9528 9529 public final boolean getGlobalVisibleRect(Rect r) { 9530 return getGlobalVisibleRect(r, null); 9531 } 9532 9533 public final boolean getLocalVisibleRect(Rect r) { 9534 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9535 if (getGlobalVisibleRect(r, offset)) { 9536 r.offset(-offset.x, -offset.y); // make r local 9537 return true; 9538 } 9539 return false; 9540 } 9541 9542 /** 9543 * Offset this view's vertical location by the specified number of pixels. 9544 * 9545 * @param offset the number of pixels to offset the view by 9546 */ 9547 public void offsetTopAndBottom(int offset) { 9548 if (offset != 0) { 9549 updateMatrix(); 9550 final boolean matrixIsIdentity = mTransformationInfo == null 9551 || mTransformationInfo.mMatrixIsIdentity; 9552 if (matrixIsIdentity) { 9553 if (mDisplayList != null) { 9554 invalidateViewProperty(false, false); 9555 } else { 9556 final ViewParent p = mParent; 9557 if (p != null && mAttachInfo != null) { 9558 final Rect r = mAttachInfo.mTmpInvalRect; 9559 int minTop; 9560 int maxBottom; 9561 int yLoc; 9562 if (offset < 0) { 9563 minTop = mTop + offset; 9564 maxBottom = mBottom; 9565 yLoc = offset; 9566 } else { 9567 minTop = mTop; 9568 maxBottom = mBottom + offset; 9569 yLoc = 0; 9570 } 9571 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9572 p.invalidateChild(this, r); 9573 } 9574 } 9575 } else { 9576 invalidateViewProperty(false, false); 9577 } 9578 9579 mTop += offset; 9580 mBottom += offset; 9581 if (mDisplayList != null) { 9582 mDisplayList.offsetTopBottom(offset); 9583 invalidateViewProperty(false, false); 9584 } else { 9585 if (!matrixIsIdentity) { 9586 invalidateViewProperty(false, true); 9587 } 9588 invalidateParentIfNeeded(); 9589 } 9590 } 9591 } 9592 9593 /** 9594 * Offset this view's horizontal location by the specified amount of pixels. 9595 * 9596 * @param offset the numer of pixels to offset the view by 9597 */ 9598 public void offsetLeftAndRight(int offset) { 9599 if (offset != 0) { 9600 updateMatrix(); 9601 final boolean matrixIsIdentity = mTransformationInfo == null 9602 || mTransformationInfo.mMatrixIsIdentity; 9603 if (matrixIsIdentity) { 9604 if (mDisplayList != null) { 9605 invalidateViewProperty(false, false); 9606 } else { 9607 final ViewParent p = mParent; 9608 if (p != null && mAttachInfo != null) { 9609 final Rect r = mAttachInfo.mTmpInvalRect; 9610 int minLeft; 9611 int maxRight; 9612 if (offset < 0) { 9613 minLeft = mLeft + offset; 9614 maxRight = mRight; 9615 } else { 9616 minLeft = mLeft; 9617 maxRight = mRight + offset; 9618 } 9619 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9620 p.invalidateChild(this, r); 9621 } 9622 } 9623 } else { 9624 invalidateViewProperty(false, false); 9625 } 9626 9627 mLeft += offset; 9628 mRight += offset; 9629 if (mDisplayList != null) { 9630 mDisplayList.offsetLeftRight(offset); 9631 invalidateViewProperty(false, false); 9632 } else { 9633 if (!matrixIsIdentity) { 9634 invalidateViewProperty(false, true); 9635 } 9636 invalidateParentIfNeeded(); 9637 } 9638 } 9639 } 9640 9641 /** 9642 * Get the LayoutParams associated with this view. All views should have 9643 * layout parameters. These supply parameters to the <i>parent</i> of this 9644 * view specifying how it should be arranged. There are many subclasses of 9645 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9646 * of ViewGroup that are responsible for arranging their children. 9647 * 9648 * This method may return null if this View is not attached to a parent 9649 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9650 * was not invoked successfully. When a View is attached to a parent 9651 * ViewGroup, this method must not return null. 9652 * 9653 * @return The LayoutParams associated with this view, or null if no 9654 * parameters have been set yet 9655 */ 9656 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9657 public ViewGroup.LayoutParams getLayoutParams() { 9658 return mLayoutParams; 9659 } 9660 9661 /** 9662 * Set the layout parameters associated with this view. These supply 9663 * parameters to the <i>parent</i> of this view specifying how it should be 9664 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9665 * correspond to the different subclasses of ViewGroup that are responsible 9666 * for arranging their children. 9667 * 9668 * @param params The layout parameters for this view, cannot be null 9669 */ 9670 public void setLayoutParams(ViewGroup.LayoutParams params) { 9671 if (params == null) { 9672 throw new NullPointerException("Layout parameters cannot be null"); 9673 } 9674 mLayoutParams = params; 9675 if (mParent instanceof ViewGroup) { 9676 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9677 } 9678 requestLayout(); 9679 } 9680 9681 /** 9682 * Set the scrolled position of your view. This will cause a call to 9683 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9684 * invalidated. 9685 * @param x the x position to scroll to 9686 * @param y the y position to scroll to 9687 */ 9688 public void scrollTo(int x, int y) { 9689 if (mScrollX != x || mScrollY != y) { 9690 int oldX = mScrollX; 9691 int oldY = mScrollY; 9692 mScrollX = x; 9693 mScrollY = y; 9694 invalidateParentCaches(); 9695 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9696 if (!awakenScrollBars()) { 9697 postInvalidateOnAnimation(); 9698 } 9699 } 9700 } 9701 9702 /** 9703 * Move the scrolled position of your view. This will cause a call to 9704 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9705 * invalidated. 9706 * @param x the amount of pixels to scroll by horizontally 9707 * @param y the amount of pixels to scroll by vertically 9708 */ 9709 public void scrollBy(int x, int y) { 9710 scrollTo(mScrollX + x, mScrollY + y); 9711 } 9712 9713 /** 9714 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9715 * animation to fade the scrollbars out after a default delay. If a subclass 9716 * provides animated scrolling, the start delay should equal the duration 9717 * of the scrolling animation.</p> 9718 * 9719 * <p>The animation starts only if at least one of the scrollbars is 9720 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9721 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9722 * this method returns true, and false otherwise. If the animation is 9723 * started, this method calls {@link #invalidate()}; in that case the 9724 * caller should not call {@link #invalidate()}.</p> 9725 * 9726 * <p>This method should be invoked every time a subclass directly updates 9727 * the scroll parameters.</p> 9728 * 9729 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9730 * and {@link #scrollTo(int, int)}.</p> 9731 * 9732 * @return true if the animation is played, false otherwise 9733 * 9734 * @see #awakenScrollBars(int) 9735 * @see #scrollBy(int, int) 9736 * @see #scrollTo(int, int) 9737 * @see #isHorizontalScrollBarEnabled() 9738 * @see #isVerticalScrollBarEnabled() 9739 * @see #setHorizontalScrollBarEnabled(boolean) 9740 * @see #setVerticalScrollBarEnabled(boolean) 9741 */ 9742 protected boolean awakenScrollBars() { 9743 return mScrollCache != null && 9744 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9745 } 9746 9747 /** 9748 * Trigger the scrollbars to draw. 9749 * This method differs from awakenScrollBars() only in its default duration. 9750 * initialAwakenScrollBars() will show the scroll bars for longer than 9751 * usual to give the user more of a chance to notice them. 9752 * 9753 * @return true if the animation is played, false otherwise. 9754 */ 9755 private boolean initialAwakenScrollBars() { 9756 return mScrollCache != null && 9757 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9758 } 9759 9760 /** 9761 * <p> 9762 * Trigger the scrollbars to draw. When invoked this method starts an 9763 * animation to fade the scrollbars out after a fixed delay. If a subclass 9764 * provides animated scrolling, the start delay should equal the duration of 9765 * the scrolling animation. 9766 * </p> 9767 * 9768 * <p> 9769 * The animation starts only if at least one of the scrollbars is enabled, 9770 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9771 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9772 * this method returns true, and false otherwise. If the animation is 9773 * started, this method calls {@link #invalidate()}; in that case the caller 9774 * should not call {@link #invalidate()}. 9775 * </p> 9776 * 9777 * <p> 9778 * This method should be invoked everytime a subclass directly updates the 9779 * scroll parameters. 9780 * </p> 9781 * 9782 * @param startDelay the delay, in milliseconds, after which the animation 9783 * should start; when the delay is 0, the animation starts 9784 * immediately 9785 * @return true if the animation is played, false otherwise 9786 * 9787 * @see #scrollBy(int, int) 9788 * @see #scrollTo(int, int) 9789 * @see #isHorizontalScrollBarEnabled() 9790 * @see #isVerticalScrollBarEnabled() 9791 * @see #setHorizontalScrollBarEnabled(boolean) 9792 * @see #setVerticalScrollBarEnabled(boolean) 9793 */ 9794 protected boolean awakenScrollBars(int startDelay) { 9795 return awakenScrollBars(startDelay, true); 9796 } 9797 9798 /** 9799 * <p> 9800 * Trigger the scrollbars to draw. When invoked this method starts an 9801 * animation to fade the scrollbars out after a fixed delay. If a subclass 9802 * provides animated scrolling, the start delay should equal the duration of 9803 * the scrolling animation. 9804 * </p> 9805 * 9806 * <p> 9807 * The animation starts only if at least one of the scrollbars is enabled, 9808 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9809 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9810 * this method returns true, and false otherwise. If the animation is 9811 * started, this method calls {@link #invalidate()} if the invalidate parameter 9812 * is set to true; in that case the caller 9813 * should not call {@link #invalidate()}. 9814 * </p> 9815 * 9816 * <p> 9817 * This method should be invoked everytime a subclass directly updates the 9818 * scroll parameters. 9819 * </p> 9820 * 9821 * @param startDelay the delay, in milliseconds, after which the animation 9822 * should start; when the delay is 0, the animation starts 9823 * immediately 9824 * 9825 * @param invalidate Wheter this method should call invalidate 9826 * 9827 * @return true if the animation is played, false otherwise 9828 * 9829 * @see #scrollBy(int, int) 9830 * @see #scrollTo(int, int) 9831 * @see #isHorizontalScrollBarEnabled() 9832 * @see #isVerticalScrollBarEnabled() 9833 * @see #setHorizontalScrollBarEnabled(boolean) 9834 * @see #setVerticalScrollBarEnabled(boolean) 9835 */ 9836 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9837 final ScrollabilityCache scrollCache = mScrollCache; 9838 9839 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9840 return false; 9841 } 9842 9843 if (scrollCache.scrollBar == null) { 9844 scrollCache.scrollBar = new ScrollBarDrawable(); 9845 } 9846 9847 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9848 9849 if (invalidate) { 9850 // Invalidate to show the scrollbars 9851 postInvalidateOnAnimation(); 9852 } 9853 9854 if (scrollCache.state == ScrollabilityCache.OFF) { 9855 // FIXME: this is copied from WindowManagerService. 9856 // We should get this value from the system when it 9857 // is possible to do so. 9858 final int KEY_REPEAT_FIRST_DELAY = 750; 9859 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9860 } 9861 9862 // Tell mScrollCache when we should start fading. This may 9863 // extend the fade start time if one was already scheduled 9864 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9865 scrollCache.fadeStartTime = fadeStartTime; 9866 scrollCache.state = ScrollabilityCache.ON; 9867 9868 // Schedule our fader to run, unscheduling any old ones first 9869 if (mAttachInfo != null) { 9870 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9871 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9872 } 9873 9874 return true; 9875 } 9876 9877 return false; 9878 } 9879 9880 /** 9881 * Do not invalidate views which are not visible and which are not running an animation. They 9882 * will not get drawn and they should not set dirty flags as if they will be drawn 9883 */ 9884 private boolean skipInvalidate() { 9885 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9886 (!(mParent instanceof ViewGroup) || 9887 !((ViewGroup) mParent).isViewTransitioning(this)); 9888 } 9889 /** 9890 * Mark the area defined by dirty as needing to be drawn. If the view is 9891 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9892 * in the future. This must be called from a UI thread. To call from a non-UI 9893 * thread, call {@link #postInvalidate()}. 9894 * 9895 * WARNING: This method is destructive to dirty. 9896 * @param dirty the rectangle representing the bounds of the dirty region 9897 */ 9898 public void invalidate(Rect dirty) { 9899 if (skipInvalidate()) { 9900 return; 9901 } 9902 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9903 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9904 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9905 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9906 mPrivateFlags |= INVALIDATED; 9907 mPrivateFlags |= DIRTY; 9908 final ViewParent p = mParent; 9909 final AttachInfo ai = mAttachInfo; 9910 //noinspection PointlessBooleanExpression,ConstantConditions 9911 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9912 if (p != null && ai != null && ai.mHardwareAccelerated) { 9913 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9914 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9915 p.invalidateChild(this, null); 9916 return; 9917 } 9918 } 9919 if (p != null && ai != null) { 9920 final int scrollX = mScrollX; 9921 final int scrollY = mScrollY; 9922 final Rect r = ai.mTmpInvalRect; 9923 r.set(dirty.left - scrollX, dirty.top - scrollY, 9924 dirty.right - scrollX, dirty.bottom - scrollY); 9925 mParent.invalidateChild(this, r); 9926 } 9927 } 9928 } 9929 9930 /** 9931 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9932 * The coordinates of the dirty rect are relative to the view. 9933 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9934 * will be called at some point in the future. This must be called from 9935 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9936 * @param l the left position of the dirty region 9937 * @param t the top position of the dirty region 9938 * @param r the right position of the dirty region 9939 * @param b the bottom position of the dirty region 9940 */ 9941 public void invalidate(int l, int t, int r, int b) { 9942 if (skipInvalidate()) { 9943 return; 9944 } 9945 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9946 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9947 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9948 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9949 mPrivateFlags |= INVALIDATED; 9950 mPrivateFlags |= DIRTY; 9951 final ViewParent p = mParent; 9952 final AttachInfo ai = mAttachInfo; 9953 //noinspection PointlessBooleanExpression,ConstantConditions 9954 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9955 if (p != null && ai != null && ai.mHardwareAccelerated) { 9956 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9957 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9958 p.invalidateChild(this, null); 9959 return; 9960 } 9961 } 9962 if (p != null && ai != null && l < r && t < b) { 9963 final int scrollX = mScrollX; 9964 final int scrollY = mScrollY; 9965 final Rect tmpr = ai.mTmpInvalRect; 9966 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9967 p.invalidateChild(this, tmpr); 9968 } 9969 } 9970 } 9971 9972 /** 9973 * Invalidate the whole view. If the view is visible, 9974 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9975 * the future. This must be called from a UI thread. To call from a non-UI thread, 9976 * call {@link #postInvalidate()}. 9977 */ 9978 public void invalidate() { 9979 invalidate(true); 9980 } 9981 9982 /** 9983 * This is where the invalidate() work actually happens. A full invalidate() 9984 * causes the drawing cache to be invalidated, but this function can be called with 9985 * invalidateCache set to false to skip that invalidation step for cases that do not 9986 * need it (for example, a component that remains at the same dimensions with the same 9987 * content). 9988 * 9989 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9990 * well. This is usually true for a full invalidate, but may be set to false if the 9991 * View's contents or dimensions have not changed. 9992 */ 9993 void invalidate(boolean invalidateCache) { 9994 if (skipInvalidate()) { 9995 return; 9996 } 9997 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9998 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9999 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 10000 mLastIsOpaque = isOpaque(); 10001 mPrivateFlags &= ~DRAWN; 10002 mPrivateFlags |= DIRTY; 10003 if (invalidateCache) { 10004 mPrivateFlags |= INVALIDATED; 10005 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10006 } 10007 final AttachInfo ai = mAttachInfo; 10008 final ViewParent p = mParent; 10009 //noinspection PointlessBooleanExpression,ConstantConditions 10010 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10011 if (p != null && ai != null && ai.mHardwareAccelerated) { 10012 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10013 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10014 p.invalidateChild(this, null); 10015 return; 10016 } 10017 } 10018 10019 if (p != null && ai != null) { 10020 final Rect r = ai.mTmpInvalRect; 10021 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10022 // Don't call invalidate -- we don't want to internally scroll 10023 // our own bounds 10024 p.invalidateChild(this, r); 10025 } 10026 } 10027 } 10028 10029 /** 10030 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10031 * set any flags or handle all of the cases handled by the default invalidation methods. 10032 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10033 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10034 * walk up the hierarchy, transforming the dirty rect as necessary. 10035 * 10036 * The method also handles normal invalidation logic if display list properties are not 10037 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10038 * backup approach, to handle these cases used in the various property-setting methods. 10039 * 10040 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10041 * are not being used in this view 10042 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10043 * list properties are not being used in this view 10044 */ 10045 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10046 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10047 if (invalidateParent) { 10048 invalidateParentCaches(); 10049 } 10050 if (forceRedraw) { 10051 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10052 } 10053 invalidate(false); 10054 } else { 10055 final AttachInfo ai = mAttachInfo; 10056 final ViewParent p = mParent; 10057 if (p != null && ai != null) { 10058 final Rect r = ai.mTmpInvalRect; 10059 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10060 if (mParent instanceof ViewGroup) { 10061 ((ViewGroup) mParent).invalidateChildFast(this, r); 10062 } else { 10063 mParent.invalidateChild(this, r); 10064 } 10065 } 10066 } 10067 } 10068 10069 /** 10070 * Utility method to transform a given Rect by the current matrix of this view. 10071 */ 10072 void transformRect(final Rect rect) { 10073 if (!getMatrix().isIdentity()) { 10074 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10075 boundingRect.set(rect); 10076 getMatrix().mapRect(boundingRect); 10077 rect.set((int) (boundingRect.left - 0.5f), 10078 (int) (boundingRect.top - 0.5f), 10079 (int) (boundingRect.right + 0.5f), 10080 (int) (boundingRect.bottom + 0.5f)); 10081 } 10082 } 10083 10084 /** 10085 * Used to indicate that the parent of this view should clear its caches. This functionality 10086 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10087 * which is necessary when various parent-managed properties of the view change, such as 10088 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10089 * clears the parent caches and does not causes an invalidate event. 10090 * 10091 * @hide 10092 */ 10093 protected void invalidateParentCaches() { 10094 if (mParent instanceof View) { 10095 ((View) mParent).mPrivateFlags |= INVALIDATED; 10096 } 10097 } 10098 10099 /** 10100 * Used to indicate that the parent of this view should be invalidated. This functionality 10101 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10102 * which is necessary when various parent-managed properties of the view change, such as 10103 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10104 * an invalidation event to the parent. 10105 * 10106 * @hide 10107 */ 10108 protected void invalidateParentIfNeeded() { 10109 if (isHardwareAccelerated() && mParent instanceof View) { 10110 ((View) mParent).invalidate(true); 10111 } 10112 } 10113 10114 /** 10115 * Indicates whether this View is opaque. An opaque View guarantees that it will 10116 * draw all the pixels overlapping its bounds using a fully opaque color. 10117 * 10118 * Subclasses of View should override this method whenever possible to indicate 10119 * whether an instance is opaque. Opaque Views are treated in a special way by 10120 * the View hierarchy, possibly allowing it to perform optimizations during 10121 * invalidate/draw passes. 10122 * 10123 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10124 */ 10125 @ViewDebug.ExportedProperty(category = "drawing") 10126 public boolean isOpaque() { 10127 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10128 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10129 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10130 } 10131 10132 /** 10133 * @hide 10134 */ 10135 protected void computeOpaqueFlags() { 10136 // Opaque if: 10137 // - Has a background 10138 // - Background is opaque 10139 // - Doesn't have scrollbars or scrollbars are inside overlay 10140 10141 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10142 mPrivateFlags |= OPAQUE_BACKGROUND; 10143 } else { 10144 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10145 } 10146 10147 final int flags = mViewFlags; 10148 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10149 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10150 mPrivateFlags |= OPAQUE_SCROLLBARS; 10151 } else { 10152 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10153 } 10154 } 10155 10156 /** 10157 * @hide 10158 */ 10159 protected boolean hasOpaqueScrollbars() { 10160 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10161 } 10162 10163 /** 10164 * @return A handler associated with the thread running the View. This 10165 * handler can be used to pump events in the UI events queue. 10166 */ 10167 public Handler getHandler() { 10168 if (mAttachInfo != null) { 10169 return mAttachInfo.mHandler; 10170 } 10171 return null; 10172 } 10173 10174 /** 10175 * Gets the view root associated with the View. 10176 * @return The view root, or null if none. 10177 * @hide 10178 */ 10179 public ViewRootImpl getViewRootImpl() { 10180 if (mAttachInfo != null) { 10181 return mAttachInfo.mViewRootImpl; 10182 } 10183 return null; 10184 } 10185 10186 /** 10187 * <p>Causes the Runnable to be added to the message queue. 10188 * The runnable will be run on the user interface thread.</p> 10189 * 10190 * <p>This method can be invoked from outside of the UI thread 10191 * only when this View is attached to a window.</p> 10192 * 10193 * @param action The Runnable that will be executed. 10194 * 10195 * @return Returns true if the Runnable was successfully placed in to the 10196 * message queue. Returns false on failure, usually because the 10197 * looper processing the message queue is exiting. 10198 * 10199 * @see #postDelayed 10200 * @see #removeCallbacks 10201 */ 10202 public boolean post(Runnable action) { 10203 final AttachInfo attachInfo = mAttachInfo; 10204 if (attachInfo != null) { 10205 return attachInfo.mHandler.post(action); 10206 } 10207 // Assume that post will succeed later 10208 ViewRootImpl.getRunQueue().post(action); 10209 return true; 10210 } 10211 10212 /** 10213 * <p>Causes the Runnable to be added to the message queue, to be run 10214 * after the specified amount of time elapses. 10215 * The runnable will be run on the user interface thread.</p> 10216 * 10217 * <p>This method can be invoked from outside of the UI thread 10218 * only when this View is attached to a window.</p> 10219 * 10220 * @param action The Runnable that will be executed. 10221 * @param delayMillis The delay (in milliseconds) until the Runnable 10222 * will be executed. 10223 * 10224 * @return true if the Runnable was successfully placed in to the 10225 * message queue. Returns false on failure, usually because the 10226 * looper processing the message queue is exiting. Note that a 10227 * result of true does not mean the Runnable will be processed -- 10228 * if the looper is quit before the delivery time of the message 10229 * occurs then the message will be dropped. 10230 * 10231 * @see #post 10232 * @see #removeCallbacks 10233 */ 10234 public boolean postDelayed(Runnable action, long delayMillis) { 10235 final AttachInfo attachInfo = mAttachInfo; 10236 if (attachInfo != null) { 10237 return attachInfo.mHandler.postDelayed(action, delayMillis); 10238 } 10239 // Assume that post will succeed later 10240 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10241 return true; 10242 } 10243 10244 /** 10245 * <p>Causes the Runnable to execute on the next animation time step. 10246 * The runnable will be run on the user interface thread.</p> 10247 * 10248 * <p>This method can be invoked from outside of the UI thread 10249 * only when this View is attached to a window.</p> 10250 * 10251 * @param action The Runnable that will be executed. 10252 * 10253 * @see #postOnAnimationDelayed 10254 * @see #removeCallbacks 10255 */ 10256 public void postOnAnimation(Runnable action) { 10257 final AttachInfo attachInfo = mAttachInfo; 10258 if (attachInfo != null) { 10259 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10260 Choreographer.CALLBACK_ANIMATION, action, null); 10261 } else { 10262 // Assume that post will succeed later 10263 ViewRootImpl.getRunQueue().post(action); 10264 } 10265 } 10266 10267 /** 10268 * <p>Causes the Runnable to execute on the next animation time step, 10269 * after the specified amount of time elapses. 10270 * The runnable will be run on the user interface thread.</p> 10271 * 10272 * <p>This method can be invoked from outside of the UI thread 10273 * only when this View is attached to a window.</p> 10274 * 10275 * @param action The Runnable that will be executed. 10276 * @param delayMillis The delay (in milliseconds) until the Runnable 10277 * will be executed. 10278 * 10279 * @see #postOnAnimation 10280 * @see #removeCallbacks 10281 */ 10282 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10283 final AttachInfo attachInfo = mAttachInfo; 10284 if (attachInfo != null) { 10285 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10286 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10287 } else { 10288 // Assume that post will succeed later 10289 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10290 } 10291 } 10292 10293 /** 10294 * <p>Removes the specified Runnable from the message queue.</p> 10295 * 10296 * <p>This method can be invoked from outside of the UI thread 10297 * only when this View is attached to a window.</p> 10298 * 10299 * @param action The Runnable to remove from the message handling queue 10300 * 10301 * @return true if this view could ask the Handler to remove the Runnable, 10302 * false otherwise. When the returned value is true, the Runnable 10303 * may or may not have been actually removed from the message queue 10304 * (for instance, if the Runnable was not in the queue already.) 10305 * 10306 * @see #post 10307 * @see #postDelayed 10308 * @see #postOnAnimation 10309 * @see #postOnAnimationDelayed 10310 */ 10311 public boolean removeCallbacks(Runnable action) { 10312 if (action != null) { 10313 final AttachInfo attachInfo = mAttachInfo; 10314 if (attachInfo != null) { 10315 attachInfo.mHandler.removeCallbacks(action); 10316 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10317 Choreographer.CALLBACK_ANIMATION, action, null); 10318 } else { 10319 // Assume that post will succeed later 10320 ViewRootImpl.getRunQueue().removeCallbacks(action); 10321 } 10322 } 10323 return true; 10324 } 10325 10326 /** 10327 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10328 * Use this to invalidate the View from a non-UI thread.</p> 10329 * 10330 * <p>This method can be invoked from outside of the UI thread 10331 * only when this View is attached to a window.</p> 10332 * 10333 * @see #invalidate() 10334 * @see #postInvalidateDelayed(long) 10335 */ 10336 public void postInvalidate() { 10337 postInvalidateDelayed(0); 10338 } 10339 10340 /** 10341 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10342 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10343 * 10344 * <p>This method can be invoked from outside of the UI thread 10345 * only when this View is attached to a window.</p> 10346 * 10347 * @param left The left coordinate of the rectangle to invalidate. 10348 * @param top The top coordinate of the rectangle to invalidate. 10349 * @param right The right coordinate of the rectangle to invalidate. 10350 * @param bottom The bottom coordinate of the rectangle to invalidate. 10351 * 10352 * @see #invalidate(int, int, int, int) 10353 * @see #invalidate(Rect) 10354 * @see #postInvalidateDelayed(long, int, int, int, int) 10355 */ 10356 public void postInvalidate(int left, int top, int right, int bottom) { 10357 postInvalidateDelayed(0, left, top, right, bottom); 10358 } 10359 10360 /** 10361 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10362 * loop. Waits for the specified amount of time.</p> 10363 * 10364 * <p>This method can be invoked from outside of the UI thread 10365 * only when this View is attached to a window.</p> 10366 * 10367 * @param delayMilliseconds the duration in milliseconds to delay the 10368 * invalidation by 10369 * 10370 * @see #invalidate() 10371 * @see #postInvalidate() 10372 */ 10373 public void postInvalidateDelayed(long delayMilliseconds) { 10374 // We try only with the AttachInfo because there's no point in invalidating 10375 // if we are not attached to our window 10376 final AttachInfo attachInfo = mAttachInfo; 10377 if (attachInfo != null) { 10378 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10379 } 10380 } 10381 10382 /** 10383 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10384 * through the event loop. Waits for the specified amount of time.</p> 10385 * 10386 * <p>This method can be invoked from outside of the UI thread 10387 * only when this View is attached to a window.</p> 10388 * 10389 * @param delayMilliseconds the duration in milliseconds to delay the 10390 * invalidation by 10391 * @param left The left coordinate of the rectangle to invalidate. 10392 * @param top The top coordinate of the rectangle to invalidate. 10393 * @param right The right coordinate of the rectangle to invalidate. 10394 * @param bottom The bottom coordinate of the rectangle to invalidate. 10395 * 10396 * @see #invalidate(int, int, int, int) 10397 * @see #invalidate(Rect) 10398 * @see #postInvalidate(int, int, int, int) 10399 */ 10400 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10401 int right, int bottom) { 10402 10403 // We try only with the AttachInfo because there's no point in invalidating 10404 // if we are not attached to our window 10405 final AttachInfo attachInfo = mAttachInfo; 10406 if (attachInfo != null) { 10407 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10408 info.target = this; 10409 info.left = left; 10410 info.top = top; 10411 info.right = right; 10412 info.bottom = bottom; 10413 10414 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10415 } 10416 } 10417 10418 /** 10419 * <p>Cause an invalidate to happen on the next animation time step, typically the 10420 * next display frame.</p> 10421 * 10422 * <p>This method can be invoked from outside of the UI thread 10423 * only when this View is attached to a window.</p> 10424 * 10425 * @see #invalidate() 10426 */ 10427 public void postInvalidateOnAnimation() { 10428 // We try only with the AttachInfo because there's no point in invalidating 10429 // if we are not attached to our window 10430 final AttachInfo attachInfo = mAttachInfo; 10431 if (attachInfo != null) { 10432 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10433 } 10434 } 10435 10436 /** 10437 * <p>Cause an invalidate of the specified area to happen on the next animation 10438 * time step, typically the next display frame.</p> 10439 * 10440 * <p>This method can be invoked from outside of the UI thread 10441 * only when this View is attached to a window.</p> 10442 * 10443 * @param left The left coordinate of the rectangle to invalidate. 10444 * @param top The top coordinate of the rectangle to invalidate. 10445 * @param right The right coordinate of the rectangle to invalidate. 10446 * @param bottom The bottom coordinate of the rectangle to invalidate. 10447 * 10448 * @see #invalidate(int, int, int, int) 10449 * @see #invalidate(Rect) 10450 */ 10451 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10452 // We try only with the AttachInfo because there's no point in invalidating 10453 // if we are not attached to our window 10454 final AttachInfo attachInfo = mAttachInfo; 10455 if (attachInfo != null) { 10456 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10457 info.target = this; 10458 info.left = left; 10459 info.top = top; 10460 info.right = right; 10461 info.bottom = bottom; 10462 10463 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10464 } 10465 } 10466 10467 /** 10468 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10469 * This event is sent at most once every 10470 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10471 */ 10472 private void postSendViewScrolledAccessibilityEventCallback() { 10473 if (mSendViewScrolledAccessibilityEvent == null) { 10474 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10475 } 10476 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10477 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10478 postDelayed(mSendViewScrolledAccessibilityEvent, 10479 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10480 } 10481 } 10482 10483 /** 10484 * Called by a parent to request that a child update its values for mScrollX 10485 * and mScrollY if necessary. This will typically be done if the child is 10486 * animating a scroll using a {@link android.widget.Scroller Scroller} 10487 * object. 10488 */ 10489 public void computeScroll() { 10490 } 10491 10492 /** 10493 * <p>Indicate whether the horizontal edges are faded when the view is 10494 * scrolled horizontally.</p> 10495 * 10496 * @return true if the horizontal edges should are faded on scroll, false 10497 * otherwise 10498 * 10499 * @see #setHorizontalFadingEdgeEnabled(boolean) 10500 * 10501 * @attr ref android.R.styleable#View_requiresFadingEdge 10502 */ 10503 public boolean isHorizontalFadingEdgeEnabled() { 10504 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10505 } 10506 10507 /** 10508 * <p>Define whether the horizontal edges should be faded when this view 10509 * is scrolled horizontally.</p> 10510 * 10511 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10512 * be faded when the view is scrolled 10513 * horizontally 10514 * 10515 * @see #isHorizontalFadingEdgeEnabled() 10516 * 10517 * @attr ref android.R.styleable#View_requiresFadingEdge 10518 */ 10519 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10520 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10521 if (horizontalFadingEdgeEnabled) { 10522 initScrollCache(); 10523 } 10524 10525 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10526 } 10527 } 10528 10529 /** 10530 * <p>Indicate whether the vertical edges are faded when the view is 10531 * scrolled horizontally.</p> 10532 * 10533 * @return true if the vertical edges should are faded on scroll, false 10534 * otherwise 10535 * 10536 * @see #setVerticalFadingEdgeEnabled(boolean) 10537 * 10538 * @attr ref android.R.styleable#View_requiresFadingEdge 10539 */ 10540 public boolean isVerticalFadingEdgeEnabled() { 10541 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10542 } 10543 10544 /** 10545 * <p>Define whether the vertical edges should be faded when this view 10546 * is scrolled vertically.</p> 10547 * 10548 * @param verticalFadingEdgeEnabled true if the vertical edges should 10549 * be faded when the view is scrolled 10550 * vertically 10551 * 10552 * @see #isVerticalFadingEdgeEnabled() 10553 * 10554 * @attr ref android.R.styleable#View_requiresFadingEdge 10555 */ 10556 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10557 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10558 if (verticalFadingEdgeEnabled) { 10559 initScrollCache(); 10560 } 10561 10562 mViewFlags ^= FADING_EDGE_VERTICAL; 10563 } 10564 } 10565 10566 /** 10567 * Returns the strength, or intensity, of the top faded edge. The strength is 10568 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10569 * returns 0.0 or 1.0 but no value in between. 10570 * 10571 * Subclasses should override this method to provide a smoother fade transition 10572 * when scrolling occurs. 10573 * 10574 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10575 */ 10576 protected float getTopFadingEdgeStrength() { 10577 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10578 } 10579 10580 /** 10581 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10582 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10583 * returns 0.0 or 1.0 but no value in between. 10584 * 10585 * Subclasses should override this method to provide a smoother fade transition 10586 * when scrolling occurs. 10587 * 10588 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10589 */ 10590 protected float getBottomFadingEdgeStrength() { 10591 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10592 computeVerticalScrollRange() ? 1.0f : 0.0f; 10593 } 10594 10595 /** 10596 * Returns the strength, or intensity, of the left faded edge. The strength is 10597 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10598 * returns 0.0 or 1.0 but no value in between. 10599 * 10600 * Subclasses should override this method to provide a smoother fade transition 10601 * when scrolling occurs. 10602 * 10603 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10604 */ 10605 protected float getLeftFadingEdgeStrength() { 10606 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10607 } 10608 10609 /** 10610 * Returns the strength, or intensity, of the right faded edge. The strength is 10611 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10612 * returns 0.0 or 1.0 but no value in between. 10613 * 10614 * Subclasses should override this method to provide a smoother fade transition 10615 * when scrolling occurs. 10616 * 10617 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10618 */ 10619 protected float getRightFadingEdgeStrength() { 10620 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10621 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10622 } 10623 10624 /** 10625 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10626 * scrollbar is not drawn by default.</p> 10627 * 10628 * @return true if the horizontal scrollbar should be painted, false 10629 * otherwise 10630 * 10631 * @see #setHorizontalScrollBarEnabled(boolean) 10632 */ 10633 public boolean isHorizontalScrollBarEnabled() { 10634 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10635 } 10636 10637 /** 10638 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10639 * scrollbar is not drawn by default.</p> 10640 * 10641 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10642 * be painted 10643 * 10644 * @see #isHorizontalScrollBarEnabled() 10645 */ 10646 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10647 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10648 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10649 computeOpaqueFlags(); 10650 resolvePadding(); 10651 } 10652 } 10653 10654 /** 10655 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10656 * scrollbar is not drawn by default.</p> 10657 * 10658 * @return true if the vertical scrollbar should be painted, false 10659 * otherwise 10660 * 10661 * @see #setVerticalScrollBarEnabled(boolean) 10662 */ 10663 public boolean isVerticalScrollBarEnabled() { 10664 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10665 } 10666 10667 /** 10668 * <p>Define whether the vertical scrollbar should be drawn or not. The 10669 * scrollbar is not drawn by default.</p> 10670 * 10671 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10672 * be painted 10673 * 10674 * @see #isVerticalScrollBarEnabled() 10675 */ 10676 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10677 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10678 mViewFlags ^= SCROLLBARS_VERTICAL; 10679 computeOpaqueFlags(); 10680 resolvePadding(); 10681 } 10682 } 10683 10684 /** 10685 * @hide 10686 */ 10687 protected void recomputePadding() { 10688 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10689 } 10690 10691 /** 10692 * Define whether scrollbars will fade when the view is not scrolling. 10693 * 10694 * @param fadeScrollbars wheter to enable fading 10695 * 10696 * @attr ref android.R.styleable#View_fadeScrollbars 10697 */ 10698 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10699 initScrollCache(); 10700 final ScrollabilityCache scrollabilityCache = mScrollCache; 10701 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10702 if (fadeScrollbars) { 10703 scrollabilityCache.state = ScrollabilityCache.OFF; 10704 } else { 10705 scrollabilityCache.state = ScrollabilityCache.ON; 10706 } 10707 } 10708 10709 /** 10710 * 10711 * Returns true if scrollbars will fade when this view is not scrolling 10712 * 10713 * @return true if scrollbar fading is enabled 10714 * 10715 * @attr ref android.R.styleable#View_fadeScrollbars 10716 */ 10717 public boolean isScrollbarFadingEnabled() { 10718 return mScrollCache != null && mScrollCache.fadeScrollBars; 10719 } 10720 10721 /** 10722 * 10723 * Returns the delay before scrollbars fade. 10724 * 10725 * @return the delay before scrollbars fade 10726 * 10727 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10728 */ 10729 public int getScrollBarDefaultDelayBeforeFade() { 10730 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10731 mScrollCache.scrollBarDefaultDelayBeforeFade; 10732 } 10733 10734 /** 10735 * Define the delay before scrollbars fade. 10736 * 10737 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10738 * 10739 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10740 */ 10741 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10742 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10743 } 10744 10745 /** 10746 * 10747 * Returns the scrollbar fade duration. 10748 * 10749 * @return the scrollbar fade duration 10750 * 10751 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10752 */ 10753 public int getScrollBarFadeDuration() { 10754 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10755 mScrollCache.scrollBarFadeDuration; 10756 } 10757 10758 /** 10759 * Define the scrollbar fade duration. 10760 * 10761 * @param scrollBarFadeDuration - the scrollbar fade duration 10762 * 10763 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10764 */ 10765 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10766 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10767 } 10768 10769 /** 10770 * 10771 * Returns the scrollbar size. 10772 * 10773 * @return the scrollbar size 10774 * 10775 * @attr ref android.R.styleable#View_scrollbarSize 10776 */ 10777 public int getScrollBarSize() { 10778 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10779 mScrollCache.scrollBarSize; 10780 } 10781 10782 /** 10783 * Define the scrollbar size. 10784 * 10785 * @param scrollBarSize - the scrollbar size 10786 * 10787 * @attr ref android.R.styleable#View_scrollbarSize 10788 */ 10789 public void setScrollBarSize(int scrollBarSize) { 10790 getScrollCache().scrollBarSize = scrollBarSize; 10791 } 10792 10793 /** 10794 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10795 * inset. When inset, they add to the padding of the view. And the scrollbars 10796 * can be drawn inside the padding area or on the edge of the view. For example, 10797 * if a view has a background drawable and you want to draw the scrollbars 10798 * inside the padding specified by the drawable, you can use 10799 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10800 * appear at the edge of the view, ignoring the padding, then you can use 10801 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10802 * @param style the style of the scrollbars. Should be one of 10803 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10804 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10805 * @see #SCROLLBARS_INSIDE_OVERLAY 10806 * @see #SCROLLBARS_INSIDE_INSET 10807 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10808 * @see #SCROLLBARS_OUTSIDE_INSET 10809 * 10810 * @attr ref android.R.styleable#View_scrollbarStyle 10811 */ 10812 public void setScrollBarStyle(int style) { 10813 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10814 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10815 computeOpaqueFlags(); 10816 resolvePadding(); 10817 } 10818 } 10819 10820 /** 10821 * <p>Returns the current scrollbar style.</p> 10822 * @return the current scrollbar style 10823 * @see #SCROLLBARS_INSIDE_OVERLAY 10824 * @see #SCROLLBARS_INSIDE_INSET 10825 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10826 * @see #SCROLLBARS_OUTSIDE_INSET 10827 * 10828 * @attr ref android.R.styleable#View_scrollbarStyle 10829 */ 10830 @ViewDebug.ExportedProperty(mapping = { 10831 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10832 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10833 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10834 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10835 }) 10836 public int getScrollBarStyle() { 10837 return mViewFlags & SCROLLBARS_STYLE_MASK; 10838 } 10839 10840 /** 10841 * <p>Compute the horizontal range that the horizontal scrollbar 10842 * represents.</p> 10843 * 10844 * <p>The range is expressed in arbitrary units that must be the same as the 10845 * units used by {@link #computeHorizontalScrollExtent()} and 10846 * {@link #computeHorizontalScrollOffset()}.</p> 10847 * 10848 * <p>The default range is the drawing width of this view.</p> 10849 * 10850 * @return the total horizontal range represented by the horizontal 10851 * scrollbar 10852 * 10853 * @see #computeHorizontalScrollExtent() 10854 * @see #computeHorizontalScrollOffset() 10855 * @see android.widget.ScrollBarDrawable 10856 */ 10857 protected int computeHorizontalScrollRange() { 10858 return getWidth(); 10859 } 10860 10861 /** 10862 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10863 * within the horizontal range. This value is used to compute the position 10864 * of the thumb within the scrollbar's track.</p> 10865 * 10866 * <p>The range is expressed in arbitrary units that must be the same as the 10867 * units used by {@link #computeHorizontalScrollRange()} and 10868 * {@link #computeHorizontalScrollExtent()}.</p> 10869 * 10870 * <p>The default offset is the scroll offset of this view.</p> 10871 * 10872 * @return the horizontal offset of the scrollbar's thumb 10873 * 10874 * @see #computeHorizontalScrollRange() 10875 * @see #computeHorizontalScrollExtent() 10876 * @see android.widget.ScrollBarDrawable 10877 */ 10878 protected int computeHorizontalScrollOffset() { 10879 return mScrollX; 10880 } 10881 10882 /** 10883 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10884 * within the horizontal range. This value is used to compute the length 10885 * of the thumb within the scrollbar's track.</p> 10886 * 10887 * <p>The range is expressed in arbitrary units that must be the same as the 10888 * units used by {@link #computeHorizontalScrollRange()} and 10889 * {@link #computeHorizontalScrollOffset()}.</p> 10890 * 10891 * <p>The default extent is the drawing width of this view.</p> 10892 * 10893 * @return the horizontal extent of the scrollbar's thumb 10894 * 10895 * @see #computeHorizontalScrollRange() 10896 * @see #computeHorizontalScrollOffset() 10897 * @see android.widget.ScrollBarDrawable 10898 */ 10899 protected int computeHorizontalScrollExtent() { 10900 return getWidth(); 10901 } 10902 10903 /** 10904 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10905 * 10906 * <p>The range is expressed in arbitrary units that must be the same as the 10907 * units used by {@link #computeVerticalScrollExtent()} and 10908 * {@link #computeVerticalScrollOffset()}.</p> 10909 * 10910 * @return the total vertical range represented by the vertical scrollbar 10911 * 10912 * <p>The default range is the drawing height of this view.</p> 10913 * 10914 * @see #computeVerticalScrollExtent() 10915 * @see #computeVerticalScrollOffset() 10916 * @see android.widget.ScrollBarDrawable 10917 */ 10918 protected int computeVerticalScrollRange() { 10919 return getHeight(); 10920 } 10921 10922 /** 10923 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10924 * within the horizontal range. This value is used to compute the position 10925 * of the thumb within the scrollbar's track.</p> 10926 * 10927 * <p>The range is expressed in arbitrary units that must be the same as the 10928 * units used by {@link #computeVerticalScrollRange()} and 10929 * {@link #computeVerticalScrollExtent()}.</p> 10930 * 10931 * <p>The default offset is the scroll offset of this view.</p> 10932 * 10933 * @return the vertical offset of the scrollbar's thumb 10934 * 10935 * @see #computeVerticalScrollRange() 10936 * @see #computeVerticalScrollExtent() 10937 * @see android.widget.ScrollBarDrawable 10938 */ 10939 protected int computeVerticalScrollOffset() { 10940 return mScrollY; 10941 } 10942 10943 /** 10944 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10945 * within the vertical range. This value is used to compute the length 10946 * of the thumb within the scrollbar's track.</p> 10947 * 10948 * <p>The range is expressed in arbitrary units that must be the same as the 10949 * units used by {@link #computeVerticalScrollRange()} and 10950 * {@link #computeVerticalScrollOffset()}.</p> 10951 * 10952 * <p>The default extent is the drawing height of this view.</p> 10953 * 10954 * @return the vertical extent of the scrollbar's thumb 10955 * 10956 * @see #computeVerticalScrollRange() 10957 * @see #computeVerticalScrollOffset() 10958 * @see android.widget.ScrollBarDrawable 10959 */ 10960 protected int computeVerticalScrollExtent() { 10961 return getHeight(); 10962 } 10963 10964 /** 10965 * Check if this view can be scrolled horizontally in a certain direction. 10966 * 10967 * @param direction Negative to check scrolling left, positive to check scrolling right. 10968 * @return true if this view can be scrolled in the specified direction, false otherwise. 10969 */ 10970 public boolean canScrollHorizontally(int direction) { 10971 final int offset = computeHorizontalScrollOffset(); 10972 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10973 if (range == 0) return false; 10974 if (direction < 0) { 10975 return offset > 0; 10976 } else { 10977 return offset < range - 1; 10978 } 10979 } 10980 10981 /** 10982 * Check if this view can be scrolled vertically in a certain direction. 10983 * 10984 * @param direction Negative to check scrolling up, positive to check scrolling down. 10985 * @return true if this view can be scrolled in the specified direction, false otherwise. 10986 */ 10987 public boolean canScrollVertically(int direction) { 10988 final int offset = computeVerticalScrollOffset(); 10989 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10990 if (range == 0) return false; 10991 if (direction < 0) { 10992 return offset > 0; 10993 } else { 10994 return offset < range - 1; 10995 } 10996 } 10997 10998 /** 10999 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11000 * scrollbars are painted only if they have been awakened first.</p> 11001 * 11002 * @param canvas the canvas on which to draw the scrollbars 11003 * 11004 * @see #awakenScrollBars(int) 11005 */ 11006 protected final void onDrawScrollBars(Canvas canvas) { 11007 // scrollbars are drawn only when the animation is running 11008 final ScrollabilityCache cache = mScrollCache; 11009 if (cache != null) { 11010 11011 int state = cache.state; 11012 11013 if (state == ScrollabilityCache.OFF) { 11014 return; 11015 } 11016 11017 boolean invalidate = false; 11018 11019 if (state == ScrollabilityCache.FADING) { 11020 // We're fading -- get our fade interpolation 11021 if (cache.interpolatorValues == null) { 11022 cache.interpolatorValues = new float[1]; 11023 } 11024 11025 float[] values = cache.interpolatorValues; 11026 11027 // Stops the animation if we're done 11028 if (cache.scrollBarInterpolator.timeToValues(values) == 11029 Interpolator.Result.FREEZE_END) { 11030 cache.state = ScrollabilityCache.OFF; 11031 } else { 11032 cache.scrollBar.setAlpha(Math.round(values[0])); 11033 } 11034 11035 // This will make the scroll bars inval themselves after 11036 // drawing. We only want this when we're fading so that 11037 // we prevent excessive redraws 11038 invalidate = true; 11039 } else { 11040 // We're just on -- but we may have been fading before so 11041 // reset alpha 11042 cache.scrollBar.setAlpha(255); 11043 } 11044 11045 11046 final int viewFlags = mViewFlags; 11047 11048 final boolean drawHorizontalScrollBar = 11049 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11050 final boolean drawVerticalScrollBar = 11051 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11052 && !isVerticalScrollBarHidden(); 11053 11054 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11055 final int width = mRight - mLeft; 11056 final int height = mBottom - mTop; 11057 11058 final ScrollBarDrawable scrollBar = cache.scrollBar; 11059 11060 final int scrollX = mScrollX; 11061 final int scrollY = mScrollY; 11062 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11063 11064 int left, top, right, bottom; 11065 11066 if (drawHorizontalScrollBar) { 11067 int size = scrollBar.getSize(false); 11068 if (size <= 0) { 11069 size = cache.scrollBarSize; 11070 } 11071 11072 scrollBar.setParameters(computeHorizontalScrollRange(), 11073 computeHorizontalScrollOffset(), 11074 computeHorizontalScrollExtent(), false); 11075 final int verticalScrollBarGap = drawVerticalScrollBar ? 11076 getVerticalScrollbarWidth() : 0; 11077 top = scrollY + height - size - (mUserPaddingBottom & inside); 11078 left = scrollX + (mPaddingLeft & inside); 11079 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11080 bottom = top + size; 11081 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11082 if (invalidate) { 11083 invalidate(left, top, right, bottom); 11084 } 11085 } 11086 11087 if (drawVerticalScrollBar) { 11088 int size = scrollBar.getSize(true); 11089 if (size <= 0) { 11090 size = cache.scrollBarSize; 11091 } 11092 11093 scrollBar.setParameters(computeVerticalScrollRange(), 11094 computeVerticalScrollOffset(), 11095 computeVerticalScrollExtent(), true); 11096 switch (mVerticalScrollbarPosition) { 11097 default: 11098 case SCROLLBAR_POSITION_DEFAULT: 11099 case SCROLLBAR_POSITION_RIGHT: 11100 left = scrollX + width - size - (mUserPaddingRight & inside); 11101 break; 11102 case SCROLLBAR_POSITION_LEFT: 11103 left = scrollX + (mUserPaddingLeft & inside); 11104 break; 11105 } 11106 top = scrollY + (mPaddingTop & inside); 11107 right = left + size; 11108 bottom = scrollY + height - (mUserPaddingBottom & inside); 11109 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11110 if (invalidate) { 11111 invalidate(left, top, right, bottom); 11112 } 11113 } 11114 } 11115 } 11116 } 11117 11118 /** 11119 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11120 * FastScroller is visible. 11121 * @return whether to temporarily hide the vertical scrollbar 11122 * @hide 11123 */ 11124 protected boolean isVerticalScrollBarHidden() { 11125 return false; 11126 } 11127 11128 /** 11129 * <p>Draw the horizontal scrollbar if 11130 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11131 * 11132 * @param canvas the canvas on which to draw the scrollbar 11133 * @param scrollBar the scrollbar's drawable 11134 * 11135 * @see #isHorizontalScrollBarEnabled() 11136 * @see #computeHorizontalScrollRange() 11137 * @see #computeHorizontalScrollExtent() 11138 * @see #computeHorizontalScrollOffset() 11139 * @see android.widget.ScrollBarDrawable 11140 * @hide 11141 */ 11142 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11143 int l, int t, int r, int b) { 11144 scrollBar.setBounds(l, t, r, b); 11145 scrollBar.draw(canvas); 11146 } 11147 11148 /** 11149 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11150 * returns true.</p> 11151 * 11152 * @param canvas the canvas on which to draw the scrollbar 11153 * @param scrollBar the scrollbar's drawable 11154 * 11155 * @see #isVerticalScrollBarEnabled() 11156 * @see #computeVerticalScrollRange() 11157 * @see #computeVerticalScrollExtent() 11158 * @see #computeVerticalScrollOffset() 11159 * @see android.widget.ScrollBarDrawable 11160 * @hide 11161 */ 11162 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11163 int l, int t, int r, int b) { 11164 scrollBar.setBounds(l, t, r, b); 11165 scrollBar.draw(canvas); 11166 } 11167 11168 /** 11169 * Implement this to do your drawing. 11170 * 11171 * @param canvas the canvas on which the background will be drawn 11172 */ 11173 protected void onDraw(Canvas canvas) { 11174 } 11175 11176 /* 11177 * Caller is responsible for calling requestLayout if necessary. 11178 * (This allows addViewInLayout to not request a new layout.) 11179 */ 11180 void assignParent(ViewParent parent) { 11181 if (mParent == null) { 11182 mParent = parent; 11183 } else if (parent == null) { 11184 mParent = null; 11185 } else { 11186 throw new RuntimeException("view " + this + " being added, but" 11187 + " it already has a parent"); 11188 } 11189 } 11190 11191 /** 11192 * This is called when the view is attached to a window. At this point it 11193 * has a Surface and will start drawing. Note that this function is 11194 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11195 * however it may be called any time before the first onDraw -- including 11196 * before or after {@link #onMeasure(int, int)}. 11197 * 11198 * @see #onDetachedFromWindow() 11199 */ 11200 protected void onAttachedToWindow() { 11201 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11202 mParent.requestTransparentRegion(this); 11203 } 11204 11205 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11206 initialAwakenScrollBars(); 11207 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11208 } 11209 11210 jumpDrawablesToCurrentState(); 11211 11212 // Order is important here: LayoutDirection MUST be resolved before Padding 11213 // and TextDirection 11214 resolveLayoutDirection(); 11215 resolvePadding(); 11216 resolveTextDirection(); 11217 resolveTextAlignment(); 11218 11219 clearAccessibilityFocus(); 11220 if (isFocused()) { 11221 InputMethodManager imm = InputMethodManager.peekInstance(); 11222 imm.focusIn(this); 11223 } 11224 11225 if (mAttachInfo != null && mDisplayList != null) { 11226 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11227 } 11228 } 11229 11230 /** 11231 * @see #onScreenStateChanged(int) 11232 */ 11233 void dispatchScreenStateChanged(int screenState) { 11234 onScreenStateChanged(screenState); 11235 } 11236 11237 /** 11238 * This method is called whenever the state of the screen this view is 11239 * attached to changes. A state change will usually occurs when the screen 11240 * turns on or off (whether it happens automatically or the user does it 11241 * manually.) 11242 * 11243 * @param screenState The new state of the screen. Can be either 11244 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11245 */ 11246 public void onScreenStateChanged(int screenState) { 11247 } 11248 11249 /** 11250 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11251 */ 11252 private boolean hasRtlSupport() { 11253 return mContext.getApplicationInfo().hasRtlSupport(); 11254 } 11255 11256 /** 11257 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11258 * that the parent directionality can and will be resolved before its children. 11259 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11260 */ 11261 public void resolveLayoutDirection() { 11262 // Clear any previous layout direction resolution 11263 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11264 11265 if (hasRtlSupport()) { 11266 // Set resolved depending on layout direction 11267 switch (getLayoutDirection()) { 11268 case LAYOUT_DIRECTION_INHERIT: 11269 // If this is root view, no need to look at parent's layout dir. 11270 if (canResolveLayoutDirection()) { 11271 ViewGroup viewGroup = ((ViewGroup) mParent); 11272 11273 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11274 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11275 } 11276 } else { 11277 // Nothing to do, LTR by default 11278 } 11279 break; 11280 case LAYOUT_DIRECTION_RTL: 11281 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11282 break; 11283 case LAYOUT_DIRECTION_LOCALE: 11284 if(isLayoutDirectionRtl(Locale.getDefault())) { 11285 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11286 } 11287 break; 11288 default: 11289 // Nothing to do, LTR by default 11290 } 11291 } 11292 11293 // Set to resolved 11294 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11295 onResolvedLayoutDirectionChanged(); 11296 // Resolve padding 11297 resolvePadding(); 11298 } 11299 11300 /** 11301 * Called when layout direction has been resolved. 11302 * 11303 * The default implementation does nothing. 11304 */ 11305 public void onResolvedLayoutDirectionChanged() { 11306 } 11307 11308 /** 11309 * Resolve padding depending on layout direction. 11310 */ 11311 public void resolvePadding() { 11312 // If the user specified the absolute padding (either with android:padding or 11313 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11314 // use the default padding or the padding from the background drawable 11315 // (stored at this point in mPadding*) 11316 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11317 switch (resolvedLayoutDirection) { 11318 case LAYOUT_DIRECTION_RTL: 11319 // Start user padding override Right user padding. Otherwise, if Right user 11320 // padding is not defined, use the default Right padding. If Right user padding 11321 // is defined, just use it. 11322 if (mUserPaddingStart >= 0) { 11323 mUserPaddingRight = mUserPaddingStart; 11324 } else if (mUserPaddingRight < 0) { 11325 mUserPaddingRight = mPaddingRight; 11326 } 11327 if (mUserPaddingEnd >= 0) { 11328 mUserPaddingLeft = mUserPaddingEnd; 11329 } else if (mUserPaddingLeft < 0) { 11330 mUserPaddingLeft = mPaddingLeft; 11331 } 11332 break; 11333 case LAYOUT_DIRECTION_LTR: 11334 default: 11335 // Start user padding override Left user padding. Otherwise, if Left user 11336 // padding is not defined, use the default left padding. If Left user padding 11337 // is defined, just use it. 11338 if (mUserPaddingStart >= 0) { 11339 mUserPaddingLeft = mUserPaddingStart; 11340 } else if (mUserPaddingLeft < 0) { 11341 mUserPaddingLeft = mPaddingLeft; 11342 } 11343 if (mUserPaddingEnd >= 0) { 11344 mUserPaddingRight = mUserPaddingEnd; 11345 } else if (mUserPaddingRight < 0) { 11346 mUserPaddingRight = mPaddingRight; 11347 } 11348 } 11349 11350 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11351 11352 if(isPaddingRelative()) { 11353 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11354 } else { 11355 recomputePadding(); 11356 } 11357 onPaddingChanged(resolvedLayoutDirection); 11358 } 11359 11360 /** 11361 * Resolve padding depending on the layout direction. Subclasses that care about 11362 * padding resolution should override this method. The default implementation does 11363 * nothing. 11364 * 11365 * @param layoutDirection the direction of the layout 11366 * 11367 * @see {@link #LAYOUT_DIRECTION_LTR} 11368 * @see {@link #LAYOUT_DIRECTION_RTL} 11369 */ 11370 public void onPaddingChanged(int layoutDirection) { 11371 } 11372 11373 /** 11374 * Check if layout direction resolution can be done. 11375 * 11376 * @return true if layout direction resolution can be done otherwise return false. 11377 */ 11378 public boolean canResolveLayoutDirection() { 11379 switch (getLayoutDirection()) { 11380 case LAYOUT_DIRECTION_INHERIT: 11381 return (mParent != null) && (mParent instanceof ViewGroup); 11382 default: 11383 return true; 11384 } 11385 } 11386 11387 /** 11388 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11389 * when reset is done. 11390 */ 11391 public void resetResolvedLayoutDirection() { 11392 // Reset the current resolved bits 11393 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11394 onResolvedLayoutDirectionReset(); 11395 // Reset also the text direction 11396 resetResolvedTextDirection(); 11397 } 11398 11399 /** 11400 * Called during reset of resolved layout direction. 11401 * 11402 * Subclasses need to override this method to clear cached information that depends on the 11403 * resolved layout direction, or to inform child views that inherit their layout direction. 11404 * 11405 * The default implementation does nothing. 11406 */ 11407 public void onResolvedLayoutDirectionReset() { 11408 } 11409 11410 /** 11411 * Check if a Locale uses an RTL script. 11412 * 11413 * @param locale Locale to check 11414 * @return true if the Locale uses an RTL script. 11415 */ 11416 protected static boolean isLayoutDirectionRtl(Locale locale) { 11417 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11418 } 11419 11420 /** 11421 * This is called when the view is detached from a window. At this point it 11422 * no longer has a surface for drawing. 11423 * 11424 * @see #onAttachedToWindow() 11425 */ 11426 protected void onDetachedFromWindow() { 11427 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11428 11429 removeUnsetPressCallback(); 11430 removeLongPressCallback(); 11431 removePerformClickCallback(); 11432 removeSendViewScrolledAccessibilityEventCallback(); 11433 11434 destroyDrawingCache(); 11435 11436 destroyLayer(false); 11437 11438 if (mAttachInfo != null) { 11439 if (mDisplayList != null) { 11440 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11441 } 11442 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11443 } else { 11444 // Should never happen 11445 clearDisplayList(); 11446 } 11447 11448 mCurrentAnimation = null; 11449 11450 resetResolvedLayoutDirection(); 11451 resetResolvedTextAlignment(); 11452 resetAccessibilityStateChanged(); 11453 } 11454 11455 /** 11456 * @return The number of times this view has been attached to a window 11457 */ 11458 protected int getWindowAttachCount() { 11459 return mWindowAttachCount; 11460 } 11461 11462 /** 11463 * Retrieve a unique token identifying the window this view is attached to. 11464 * @return Return the window's token for use in 11465 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11466 */ 11467 public IBinder getWindowToken() { 11468 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11469 } 11470 11471 /** 11472 * Retrieve a unique token identifying the top-level "real" window of 11473 * the window that this view is attached to. That is, this is like 11474 * {@link #getWindowToken}, except if the window this view in is a panel 11475 * window (attached to another containing window), then the token of 11476 * the containing window is returned instead. 11477 * 11478 * @return Returns the associated window token, either 11479 * {@link #getWindowToken()} or the containing window's token. 11480 */ 11481 public IBinder getApplicationWindowToken() { 11482 AttachInfo ai = mAttachInfo; 11483 if (ai != null) { 11484 IBinder appWindowToken = ai.mPanelParentWindowToken; 11485 if (appWindowToken == null) { 11486 appWindowToken = ai.mWindowToken; 11487 } 11488 return appWindowToken; 11489 } 11490 return null; 11491 } 11492 11493 /** 11494 * Retrieve private session object this view hierarchy is using to 11495 * communicate with the window manager. 11496 * @return the session object to communicate with the window manager 11497 */ 11498 /*package*/ IWindowSession getWindowSession() { 11499 return mAttachInfo != null ? mAttachInfo.mSession : null; 11500 } 11501 11502 /** 11503 * @param info the {@link android.view.View.AttachInfo} to associated with 11504 * this view 11505 */ 11506 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11507 //System.out.println("Attached! " + this); 11508 mAttachInfo = info; 11509 mWindowAttachCount++; 11510 // We will need to evaluate the drawable state at least once. 11511 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11512 if (mFloatingTreeObserver != null) { 11513 info.mTreeObserver.merge(mFloatingTreeObserver); 11514 mFloatingTreeObserver = null; 11515 } 11516 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11517 mAttachInfo.mScrollContainers.add(this); 11518 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11519 } 11520 performCollectViewAttributes(mAttachInfo, visibility); 11521 onAttachedToWindow(); 11522 11523 ListenerInfo li = mListenerInfo; 11524 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11525 li != null ? li.mOnAttachStateChangeListeners : null; 11526 if (listeners != null && listeners.size() > 0) { 11527 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11528 // perform the dispatching. The iterator is a safe guard against listeners that 11529 // could mutate the list by calling the various add/remove methods. This prevents 11530 // the array from being modified while we iterate it. 11531 for (OnAttachStateChangeListener listener : listeners) { 11532 listener.onViewAttachedToWindow(this); 11533 } 11534 } 11535 11536 int vis = info.mWindowVisibility; 11537 if (vis != GONE) { 11538 onWindowVisibilityChanged(vis); 11539 } 11540 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11541 // If nobody has evaluated the drawable state yet, then do it now. 11542 refreshDrawableState(); 11543 } 11544 } 11545 11546 void dispatchDetachedFromWindow() { 11547 AttachInfo info = mAttachInfo; 11548 if (info != null) { 11549 int vis = info.mWindowVisibility; 11550 if (vis != GONE) { 11551 onWindowVisibilityChanged(GONE); 11552 } 11553 } 11554 11555 onDetachedFromWindow(); 11556 11557 ListenerInfo li = mListenerInfo; 11558 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11559 li != null ? li.mOnAttachStateChangeListeners : null; 11560 if (listeners != null && listeners.size() > 0) { 11561 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11562 // perform the dispatching. The iterator is a safe guard against listeners that 11563 // could mutate the list by calling the various add/remove methods. This prevents 11564 // the array from being modified while we iterate it. 11565 for (OnAttachStateChangeListener listener : listeners) { 11566 listener.onViewDetachedFromWindow(this); 11567 } 11568 } 11569 11570 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11571 mAttachInfo.mScrollContainers.remove(this); 11572 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11573 } 11574 11575 mAttachInfo = null; 11576 } 11577 11578 /** 11579 * Store this view hierarchy's frozen state into the given container. 11580 * 11581 * @param container The SparseArray in which to save the view's state. 11582 * 11583 * @see #restoreHierarchyState(android.util.SparseArray) 11584 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11585 * @see #onSaveInstanceState() 11586 */ 11587 public void saveHierarchyState(SparseArray<Parcelable> container) { 11588 dispatchSaveInstanceState(container); 11589 } 11590 11591 /** 11592 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11593 * this view and its children. May be overridden to modify how freezing happens to a 11594 * view's children; for example, some views may want to not store state for their children. 11595 * 11596 * @param container The SparseArray in which to save the view's state. 11597 * 11598 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11599 * @see #saveHierarchyState(android.util.SparseArray) 11600 * @see #onSaveInstanceState() 11601 */ 11602 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11603 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11604 mPrivateFlags &= ~SAVE_STATE_CALLED; 11605 Parcelable state = onSaveInstanceState(); 11606 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11607 throw new IllegalStateException( 11608 "Derived class did not call super.onSaveInstanceState()"); 11609 } 11610 if (state != null) { 11611 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11612 // + ": " + state); 11613 container.put(mID, state); 11614 } 11615 } 11616 } 11617 11618 /** 11619 * Hook allowing a view to generate a representation of its internal state 11620 * that can later be used to create a new instance with that same state. 11621 * This state should only contain information that is not persistent or can 11622 * not be reconstructed later. For example, you will never store your 11623 * current position on screen because that will be computed again when a 11624 * new instance of the view is placed in its view hierarchy. 11625 * <p> 11626 * Some examples of things you may store here: the current cursor position 11627 * in a text view (but usually not the text itself since that is stored in a 11628 * content provider or other persistent storage), the currently selected 11629 * item in a list view. 11630 * 11631 * @return Returns a Parcelable object containing the view's current dynamic 11632 * state, or null if there is nothing interesting to save. The 11633 * default implementation returns null. 11634 * @see #onRestoreInstanceState(android.os.Parcelable) 11635 * @see #saveHierarchyState(android.util.SparseArray) 11636 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11637 * @see #setSaveEnabled(boolean) 11638 */ 11639 protected Parcelable onSaveInstanceState() { 11640 mPrivateFlags |= SAVE_STATE_CALLED; 11641 return BaseSavedState.EMPTY_STATE; 11642 } 11643 11644 /** 11645 * Restore this view hierarchy's frozen state from the given container. 11646 * 11647 * @param container The SparseArray which holds previously frozen states. 11648 * 11649 * @see #saveHierarchyState(android.util.SparseArray) 11650 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11651 * @see #onRestoreInstanceState(android.os.Parcelable) 11652 */ 11653 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11654 dispatchRestoreInstanceState(container); 11655 } 11656 11657 /** 11658 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11659 * state for this view and its children. May be overridden to modify how restoring 11660 * happens to a view's children; for example, some views may want to not store state 11661 * for their children. 11662 * 11663 * @param container The SparseArray which holds previously saved state. 11664 * 11665 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11666 * @see #restoreHierarchyState(android.util.SparseArray) 11667 * @see #onRestoreInstanceState(android.os.Parcelable) 11668 */ 11669 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11670 if (mID != NO_ID) { 11671 Parcelable state = container.get(mID); 11672 if (state != null) { 11673 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11674 // + ": " + state); 11675 mPrivateFlags &= ~SAVE_STATE_CALLED; 11676 onRestoreInstanceState(state); 11677 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11678 throw new IllegalStateException( 11679 "Derived class did not call super.onRestoreInstanceState()"); 11680 } 11681 } 11682 } 11683 } 11684 11685 /** 11686 * Hook allowing a view to re-apply a representation of its internal state that had previously 11687 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11688 * null state. 11689 * 11690 * @param state The frozen state that had previously been returned by 11691 * {@link #onSaveInstanceState}. 11692 * 11693 * @see #onSaveInstanceState() 11694 * @see #restoreHierarchyState(android.util.SparseArray) 11695 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11696 */ 11697 protected void onRestoreInstanceState(Parcelable state) { 11698 mPrivateFlags |= SAVE_STATE_CALLED; 11699 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11700 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11701 + "received " + state.getClass().toString() + " instead. This usually happens " 11702 + "when two views of different type have the same id in the same hierarchy. " 11703 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11704 + "other views do not use the same id."); 11705 } 11706 } 11707 11708 /** 11709 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11710 * 11711 * @return the drawing start time in milliseconds 11712 */ 11713 public long getDrawingTime() { 11714 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11715 } 11716 11717 /** 11718 * <p>Enables or disables the duplication of the parent's state into this view. When 11719 * duplication is enabled, this view gets its drawable state from its parent rather 11720 * than from its own internal properties.</p> 11721 * 11722 * <p>Note: in the current implementation, setting this property to true after the 11723 * view was added to a ViewGroup might have no effect at all. This property should 11724 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11725 * 11726 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11727 * property is enabled, an exception will be thrown.</p> 11728 * 11729 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11730 * parent, these states should not be affected by this method.</p> 11731 * 11732 * @param enabled True to enable duplication of the parent's drawable state, false 11733 * to disable it. 11734 * 11735 * @see #getDrawableState() 11736 * @see #isDuplicateParentStateEnabled() 11737 */ 11738 public void setDuplicateParentStateEnabled(boolean enabled) { 11739 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11740 } 11741 11742 /** 11743 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11744 * 11745 * @return True if this view's drawable state is duplicated from the parent, 11746 * false otherwise 11747 * 11748 * @see #getDrawableState() 11749 * @see #setDuplicateParentStateEnabled(boolean) 11750 */ 11751 public boolean isDuplicateParentStateEnabled() { 11752 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11753 } 11754 11755 /** 11756 * <p>Specifies the type of layer backing this view. The layer can be 11757 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11758 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11759 * 11760 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11761 * instance that controls how the layer is composed on screen. The following 11762 * properties of the paint are taken into account when composing the layer:</p> 11763 * <ul> 11764 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11765 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11766 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11767 * </ul> 11768 * 11769 * <p>If this view has an alpha value set to < 1.0 by calling 11770 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11771 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11772 * equivalent to setting a hardware layer on this view and providing a paint with 11773 * the desired alpha value.<p> 11774 * 11775 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11776 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11777 * for more information on when and how to use layers.</p> 11778 * 11779 * @param layerType The ype of layer to use with this view, must be one of 11780 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11781 * {@link #LAYER_TYPE_HARDWARE} 11782 * @param paint The paint used to compose the layer. This argument is optional 11783 * and can be null. It is ignored when the layer type is 11784 * {@link #LAYER_TYPE_NONE} 11785 * 11786 * @see #getLayerType() 11787 * @see #LAYER_TYPE_NONE 11788 * @see #LAYER_TYPE_SOFTWARE 11789 * @see #LAYER_TYPE_HARDWARE 11790 * @see #setAlpha(float) 11791 * 11792 * @attr ref android.R.styleable#View_layerType 11793 */ 11794 public void setLayerType(int layerType, Paint paint) { 11795 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11796 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11797 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11798 } 11799 11800 if (layerType == mLayerType) { 11801 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11802 mLayerPaint = paint == null ? new Paint() : paint; 11803 invalidateParentCaches(); 11804 invalidate(true); 11805 } 11806 return; 11807 } 11808 11809 // Destroy any previous software drawing cache if needed 11810 switch (mLayerType) { 11811 case LAYER_TYPE_HARDWARE: 11812 destroyLayer(false); 11813 // fall through - non-accelerated views may use software layer mechanism instead 11814 case LAYER_TYPE_SOFTWARE: 11815 destroyDrawingCache(); 11816 break; 11817 default: 11818 break; 11819 } 11820 11821 mLayerType = layerType; 11822 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11823 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11824 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11825 11826 invalidateParentCaches(); 11827 invalidate(true); 11828 } 11829 11830 /** 11831 * Indicates whether this view has a static layer. A view with layer type 11832 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11833 * dynamic. 11834 */ 11835 boolean hasStaticLayer() { 11836 return true; 11837 } 11838 11839 /** 11840 * Indicates what type of layer is currently associated with this view. By default 11841 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11842 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11843 * for more information on the different types of layers. 11844 * 11845 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11846 * {@link #LAYER_TYPE_HARDWARE} 11847 * 11848 * @see #setLayerType(int, android.graphics.Paint) 11849 * @see #buildLayer() 11850 * @see #LAYER_TYPE_NONE 11851 * @see #LAYER_TYPE_SOFTWARE 11852 * @see #LAYER_TYPE_HARDWARE 11853 */ 11854 public int getLayerType() { 11855 return mLayerType; 11856 } 11857 11858 /** 11859 * Forces this view's layer to be created and this view to be rendered 11860 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11861 * invoking this method will have no effect. 11862 * 11863 * This method can for instance be used to render a view into its layer before 11864 * starting an animation. If this view is complex, rendering into the layer 11865 * before starting the animation will avoid skipping frames. 11866 * 11867 * @throws IllegalStateException If this view is not attached to a window 11868 * 11869 * @see #setLayerType(int, android.graphics.Paint) 11870 */ 11871 public void buildLayer() { 11872 if (mLayerType == LAYER_TYPE_NONE) return; 11873 11874 if (mAttachInfo == null) { 11875 throw new IllegalStateException("This view must be attached to a window first"); 11876 } 11877 11878 switch (mLayerType) { 11879 case LAYER_TYPE_HARDWARE: 11880 if (mAttachInfo.mHardwareRenderer != null && 11881 mAttachInfo.mHardwareRenderer.isEnabled() && 11882 mAttachInfo.mHardwareRenderer.validate()) { 11883 getHardwareLayer(); 11884 } 11885 break; 11886 case LAYER_TYPE_SOFTWARE: 11887 buildDrawingCache(true); 11888 break; 11889 } 11890 } 11891 11892 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11893 void flushLayer() { 11894 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11895 mHardwareLayer.flush(); 11896 } 11897 } 11898 11899 /** 11900 * <p>Returns a hardware layer that can be used to draw this view again 11901 * without executing its draw method.</p> 11902 * 11903 * @return A HardwareLayer ready to render, or null if an error occurred. 11904 */ 11905 HardwareLayer getHardwareLayer() { 11906 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11907 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11908 return null; 11909 } 11910 11911 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11912 11913 final int width = mRight - mLeft; 11914 final int height = mBottom - mTop; 11915 11916 if (width == 0 || height == 0) { 11917 return null; 11918 } 11919 11920 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11921 if (mHardwareLayer == null) { 11922 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11923 width, height, isOpaque()); 11924 mLocalDirtyRect.set(0, 0, width, height); 11925 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11926 mHardwareLayer.resize(width, height); 11927 mLocalDirtyRect.set(0, 0, width, height); 11928 } 11929 11930 // The layer is not valid if the underlying GPU resources cannot be allocated 11931 if (!mHardwareLayer.isValid()) { 11932 return null; 11933 } 11934 11935 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11936 mLocalDirtyRect.setEmpty(); 11937 } 11938 11939 return mHardwareLayer; 11940 } 11941 11942 /** 11943 * Destroys this View's hardware layer if possible. 11944 * 11945 * @return True if the layer was destroyed, false otherwise. 11946 * 11947 * @see #setLayerType(int, android.graphics.Paint) 11948 * @see #LAYER_TYPE_HARDWARE 11949 */ 11950 boolean destroyLayer(boolean valid) { 11951 if (mHardwareLayer != null) { 11952 AttachInfo info = mAttachInfo; 11953 if (info != null && info.mHardwareRenderer != null && 11954 info.mHardwareRenderer.isEnabled() && 11955 (valid || info.mHardwareRenderer.validate())) { 11956 mHardwareLayer.destroy(); 11957 mHardwareLayer = null; 11958 11959 invalidate(true); 11960 invalidateParentCaches(); 11961 } 11962 return true; 11963 } 11964 return false; 11965 } 11966 11967 /** 11968 * Destroys all hardware rendering resources. This method is invoked 11969 * when the system needs to reclaim resources. Upon execution of this 11970 * method, you should free any OpenGL resources created by the view. 11971 * 11972 * Note: you <strong>must</strong> call 11973 * <code>super.destroyHardwareResources()</code> when overriding 11974 * this method. 11975 * 11976 * @hide 11977 */ 11978 protected void destroyHardwareResources() { 11979 destroyLayer(true); 11980 } 11981 11982 /** 11983 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11984 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11985 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11986 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11987 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11988 * null.</p> 11989 * 11990 * <p>Enabling the drawing cache is similar to 11991 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11992 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11993 * drawing cache has no effect on rendering because the system uses a different mechanism 11994 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11995 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11996 * for information on how to enable software and hardware layers.</p> 11997 * 11998 * <p>This API can be used to manually generate 11999 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12000 * {@link #getDrawingCache()}.</p> 12001 * 12002 * @param enabled true to enable the drawing cache, false otherwise 12003 * 12004 * @see #isDrawingCacheEnabled() 12005 * @see #getDrawingCache() 12006 * @see #buildDrawingCache() 12007 * @see #setLayerType(int, android.graphics.Paint) 12008 */ 12009 public void setDrawingCacheEnabled(boolean enabled) { 12010 mCachingFailed = false; 12011 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12012 } 12013 12014 /** 12015 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12016 * 12017 * @return true if the drawing cache is enabled 12018 * 12019 * @see #setDrawingCacheEnabled(boolean) 12020 * @see #getDrawingCache() 12021 */ 12022 @ViewDebug.ExportedProperty(category = "drawing") 12023 public boolean isDrawingCacheEnabled() { 12024 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12025 } 12026 12027 /** 12028 * Debugging utility which recursively outputs the dirty state of a view and its 12029 * descendants. 12030 * 12031 * @hide 12032 */ 12033 @SuppressWarnings({"UnusedDeclaration"}) 12034 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12035 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12036 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12037 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12038 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12039 if (clear) { 12040 mPrivateFlags &= clearMask; 12041 } 12042 if (this instanceof ViewGroup) { 12043 ViewGroup parent = (ViewGroup) this; 12044 final int count = parent.getChildCount(); 12045 for (int i = 0; i < count; i++) { 12046 final View child = parent.getChildAt(i); 12047 child.outputDirtyFlags(indent + " ", clear, clearMask); 12048 } 12049 } 12050 } 12051 12052 /** 12053 * This method is used by ViewGroup to cause its children to restore or recreate their 12054 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12055 * to recreate its own display list, which would happen if it went through the normal 12056 * draw/dispatchDraw mechanisms. 12057 * 12058 * @hide 12059 */ 12060 protected void dispatchGetDisplayList() {} 12061 12062 /** 12063 * A view that is not attached or hardware accelerated cannot create a display list. 12064 * This method checks these conditions and returns the appropriate result. 12065 * 12066 * @return true if view has the ability to create a display list, false otherwise. 12067 * 12068 * @hide 12069 */ 12070 public boolean canHaveDisplayList() { 12071 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12072 } 12073 12074 /** 12075 * @return The HardwareRenderer associated with that view or null if hardware rendering 12076 * is not supported or this this has not been attached to a window. 12077 * 12078 * @hide 12079 */ 12080 public HardwareRenderer getHardwareRenderer() { 12081 if (mAttachInfo != null) { 12082 return mAttachInfo.mHardwareRenderer; 12083 } 12084 return null; 12085 } 12086 12087 /** 12088 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12089 * Otherwise, the same display list will be returned (after having been rendered into 12090 * along the way, depending on the invalidation state of the view). 12091 * 12092 * @param displayList The previous version of this displayList, could be null. 12093 * @param isLayer Whether the requester of the display list is a layer. If so, 12094 * the view will avoid creating a layer inside the resulting display list. 12095 * @return A new or reused DisplayList object. 12096 */ 12097 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12098 if (!canHaveDisplayList()) { 12099 return null; 12100 } 12101 12102 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12103 displayList == null || !displayList.isValid() || 12104 (!isLayer && mRecreateDisplayList))) { 12105 // Don't need to recreate the display list, just need to tell our 12106 // children to restore/recreate theirs 12107 if (displayList != null && displayList.isValid() && 12108 !isLayer && !mRecreateDisplayList) { 12109 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12110 mPrivateFlags &= ~DIRTY_MASK; 12111 dispatchGetDisplayList(); 12112 12113 return displayList; 12114 } 12115 12116 if (!isLayer) { 12117 // If we got here, we're recreating it. Mark it as such to ensure that 12118 // we copy in child display lists into ours in drawChild() 12119 mRecreateDisplayList = true; 12120 } 12121 if (displayList == null) { 12122 final String name = getClass().getSimpleName(); 12123 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12124 // If we're creating a new display list, make sure our parent gets invalidated 12125 // since they will need to recreate their display list to account for this 12126 // new child display list. 12127 invalidateParentCaches(); 12128 } 12129 12130 boolean caching = false; 12131 final HardwareCanvas canvas = displayList.start(); 12132 int width = mRight - mLeft; 12133 int height = mBottom - mTop; 12134 12135 try { 12136 canvas.setViewport(width, height); 12137 // The dirty rect should always be null for a display list 12138 canvas.onPreDraw(null); 12139 int layerType = getLayerType(); 12140 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12141 if (layerType == LAYER_TYPE_HARDWARE) { 12142 final HardwareLayer layer = getHardwareLayer(); 12143 if (layer != null && layer.isValid()) { 12144 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12145 } else { 12146 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12147 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12148 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12149 } 12150 caching = true; 12151 } else { 12152 buildDrawingCache(true); 12153 Bitmap cache = getDrawingCache(true); 12154 if (cache != null) { 12155 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12156 caching = true; 12157 } 12158 } 12159 } else { 12160 12161 computeScroll(); 12162 12163 canvas.translate(-mScrollX, -mScrollY); 12164 if (!isLayer) { 12165 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12166 mPrivateFlags &= ~DIRTY_MASK; 12167 } 12168 12169 // Fast path for layouts with no backgrounds 12170 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12171 dispatchDraw(canvas); 12172 } else { 12173 draw(canvas); 12174 } 12175 } 12176 } finally { 12177 canvas.onPostDraw(); 12178 12179 displayList.end(); 12180 displayList.setCaching(caching); 12181 if (isLayer) { 12182 displayList.setLeftTopRightBottom(0, 0, width, height); 12183 } else { 12184 setDisplayListProperties(displayList); 12185 } 12186 } 12187 } else if (!isLayer) { 12188 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12189 mPrivateFlags &= ~DIRTY_MASK; 12190 } 12191 12192 return displayList; 12193 } 12194 12195 /** 12196 * Get the DisplayList for the HardwareLayer 12197 * 12198 * @param layer The HardwareLayer whose DisplayList we want 12199 * @return A DisplayList fopr the specified HardwareLayer 12200 */ 12201 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12202 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12203 layer.setDisplayList(displayList); 12204 return displayList; 12205 } 12206 12207 12208 /** 12209 * <p>Returns a display list that can be used to draw this view again 12210 * without executing its draw method.</p> 12211 * 12212 * @return A DisplayList ready to replay, or null if caching is not enabled. 12213 * 12214 * @hide 12215 */ 12216 public DisplayList getDisplayList() { 12217 mDisplayList = getDisplayList(mDisplayList, false); 12218 return mDisplayList; 12219 } 12220 12221 private void clearDisplayList() { 12222 if (mDisplayList != null) { 12223 mDisplayList.invalidate(); 12224 mDisplayList.clear(); 12225 } 12226 } 12227 12228 /** 12229 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12230 * 12231 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12232 * 12233 * @see #getDrawingCache(boolean) 12234 */ 12235 public Bitmap getDrawingCache() { 12236 return getDrawingCache(false); 12237 } 12238 12239 /** 12240 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12241 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12242 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12243 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12244 * request the drawing cache by calling this method and draw it on screen if the 12245 * returned bitmap is not null.</p> 12246 * 12247 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12248 * this method will create a bitmap of the same size as this view. Because this bitmap 12249 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12250 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12251 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12252 * size than the view. This implies that your application must be able to handle this 12253 * size.</p> 12254 * 12255 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12256 * the current density of the screen when the application is in compatibility 12257 * mode. 12258 * 12259 * @return A bitmap representing this view or null if cache is disabled. 12260 * 12261 * @see #setDrawingCacheEnabled(boolean) 12262 * @see #isDrawingCacheEnabled() 12263 * @see #buildDrawingCache(boolean) 12264 * @see #destroyDrawingCache() 12265 */ 12266 public Bitmap getDrawingCache(boolean autoScale) { 12267 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12268 return null; 12269 } 12270 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12271 buildDrawingCache(autoScale); 12272 } 12273 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12274 } 12275 12276 /** 12277 * <p>Frees the resources used by the drawing cache. If you call 12278 * {@link #buildDrawingCache()} manually without calling 12279 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12280 * should cleanup the cache with this method afterwards.</p> 12281 * 12282 * @see #setDrawingCacheEnabled(boolean) 12283 * @see #buildDrawingCache() 12284 * @see #getDrawingCache() 12285 */ 12286 public void destroyDrawingCache() { 12287 if (mDrawingCache != null) { 12288 mDrawingCache.recycle(); 12289 mDrawingCache = null; 12290 } 12291 if (mUnscaledDrawingCache != null) { 12292 mUnscaledDrawingCache.recycle(); 12293 mUnscaledDrawingCache = null; 12294 } 12295 } 12296 12297 /** 12298 * Setting a solid background color for the drawing cache's bitmaps will improve 12299 * performance and memory usage. Note, though that this should only be used if this 12300 * view will always be drawn on top of a solid color. 12301 * 12302 * @param color The background color to use for the drawing cache's bitmap 12303 * 12304 * @see #setDrawingCacheEnabled(boolean) 12305 * @see #buildDrawingCache() 12306 * @see #getDrawingCache() 12307 */ 12308 public void setDrawingCacheBackgroundColor(int color) { 12309 if (color != mDrawingCacheBackgroundColor) { 12310 mDrawingCacheBackgroundColor = color; 12311 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12312 } 12313 } 12314 12315 /** 12316 * @see #setDrawingCacheBackgroundColor(int) 12317 * 12318 * @return The background color to used for the drawing cache's bitmap 12319 */ 12320 public int getDrawingCacheBackgroundColor() { 12321 return mDrawingCacheBackgroundColor; 12322 } 12323 12324 /** 12325 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12326 * 12327 * @see #buildDrawingCache(boolean) 12328 */ 12329 public void buildDrawingCache() { 12330 buildDrawingCache(false); 12331 } 12332 12333 /** 12334 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12335 * 12336 * <p>If you call {@link #buildDrawingCache()} manually without calling 12337 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12338 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12339 * 12340 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12341 * this method will create a bitmap of the same size as this view. Because this bitmap 12342 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12343 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12344 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12345 * size than the view. This implies that your application must be able to handle this 12346 * size.</p> 12347 * 12348 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12349 * you do not need the drawing cache bitmap, calling this method will increase memory 12350 * usage and cause the view to be rendered in software once, thus negatively impacting 12351 * performance.</p> 12352 * 12353 * @see #getDrawingCache() 12354 * @see #destroyDrawingCache() 12355 */ 12356 public void buildDrawingCache(boolean autoScale) { 12357 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12358 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12359 mCachingFailed = false; 12360 12361 int width = mRight - mLeft; 12362 int height = mBottom - mTop; 12363 12364 final AttachInfo attachInfo = mAttachInfo; 12365 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12366 12367 if (autoScale && scalingRequired) { 12368 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12369 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12370 } 12371 12372 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12373 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12374 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12375 12376 if (width <= 0 || height <= 0 || 12377 // Projected bitmap size in bytes 12378 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12379 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12380 destroyDrawingCache(); 12381 mCachingFailed = true; 12382 return; 12383 } 12384 12385 boolean clear = true; 12386 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12387 12388 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12389 Bitmap.Config quality; 12390 if (!opaque) { 12391 // Never pick ARGB_4444 because it looks awful 12392 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12393 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12394 case DRAWING_CACHE_QUALITY_AUTO: 12395 quality = Bitmap.Config.ARGB_8888; 12396 break; 12397 case DRAWING_CACHE_QUALITY_LOW: 12398 quality = Bitmap.Config.ARGB_8888; 12399 break; 12400 case DRAWING_CACHE_QUALITY_HIGH: 12401 quality = Bitmap.Config.ARGB_8888; 12402 break; 12403 default: 12404 quality = Bitmap.Config.ARGB_8888; 12405 break; 12406 } 12407 } else { 12408 // Optimization for translucent windows 12409 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12410 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12411 } 12412 12413 // Try to cleanup memory 12414 if (bitmap != null) bitmap.recycle(); 12415 12416 try { 12417 bitmap = Bitmap.createBitmap(width, height, quality); 12418 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12419 if (autoScale) { 12420 mDrawingCache = bitmap; 12421 } else { 12422 mUnscaledDrawingCache = bitmap; 12423 } 12424 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12425 } catch (OutOfMemoryError e) { 12426 // If there is not enough memory to create the bitmap cache, just 12427 // ignore the issue as bitmap caches are not required to draw the 12428 // view hierarchy 12429 if (autoScale) { 12430 mDrawingCache = null; 12431 } else { 12432 mUnscaledDrawingCache = null; 12433 } 12434 mCachingFailed = true; 12435 return; 12436 } 12437 12438 clear = drawingCacheBackgroundColor != 0; 12439 } 12440 12441 Canvas canvas; 12442 if (attachInfo != null) { 12443 canvas = attachInfo.mCanvas; 12444 if (canvas == null) { 12445 canvas = new Canvas(); 12446 } 12447 canvas.setBitmap(bitmap); 12448 // Temporarily clobber the cached Canvas in case one of our children 12449 // is also using a drawing cache. Without this, the children would 12450 // steal the canvas by attaching their own bitmap to it and bad, bad 12451 // thing would happen (invisible views, corrupted drawings, etc.) 12452 attachInfo.mCanvas = null; 12453 } else { 12454 // This case should hopefully never or seldom happen 12455 canvas = new Canvas(bitmap); 12456 } 12457 12458 if (clear) { 12459 bitmap.eraseColor(drawingCacheBackgroundColor); 12460 } 12461 12462 computeScroll(); 12463 final int restoreCount = canvas.save(); 12464 12465 if (autoScale && scalingRequired) { 12466 final float scale = attachInfo.mApplicationScale; 12467 canvas.scale(scale, scale); 12468 } 12469 12470 canvas.translate(-mScrollX, -mScrollY); 12471 12472 mPrivateFlags |= DRAWN; 12473 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12474 mLayerType != LAYER_TYPE_NONE) { 12475 mPrivateFlags |= DRAWING_CACHE_VALID; 12476 } 12477 12478 // Fast path for layouts with no backgrounds 12479 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12480 mPrivateFlags &= ~DIRTY_MASK; 12481 dispatchDraw(canvas); 12482 } else { 12483 draw(canvas); 12484 } 12485 12486 canvas.restoreToCount(restoreCount); 12487 canvas.setBitmap(null); 12488 12489 if (attachInfo != null) { 12490 // Restore the cached Canvas for our siblings 12491 attachInfo.mCanvas = canvas; 12492 } 12493 } 12494 } 12495 12496 /** 12497 * Create a snapshot of the view into a bitmap. We should probably make 12498 * some form of this public, but should think about the API. 12499 */ 12500 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12501 int width = mRight - mLeft; 12502 int height = mBottom - mTop; 12503 12504 final AttachInfo attachInfo = mAttachInfo; 12505 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12506 width = (int) ((width * scale) + 0.5f); 12507 height = (int) ((height * scale) + 0.5f); 12508 12509 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12510 if (bitmap == null) { 12511 throw new OutOfMemoryError(); 12512 } 12513 12514 Resources resources = getResources(); 12515 if (resources != null) { 12516 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12517 } 12518 12519 Canvas canvas; 12520 if (attachInfo != null) { 12521 canvas = attachInfo.mCanvas; 12522 if (canvas == null) { 12523 canvas = new Canvas(); 12524 } 12525 canvas.setBitmap(bitmap); 12526 // Temporarily clobber the cached Canvas in case one of our children 12527 // is also using a drawing cache. Without this, the children would 12528 // steal the canvas by attaching their own bitmap to it and bad, bad 12529 // things would happen (invisible views, corrupted drawings, etc.) 12530 attachInfo.mCanvas = null; 12531 } else { 12532 // This case should hopefully never or seldom happen 12533 canvas = new Canvas(bitmap); 12534 } 12535 12536 if ((backgroundColor & 0xff000000) != 0) { 12537 bitmap.eraseColor(backgroundColor); 12538 } 12539 12540 computeScroll(); 12541 final int restoreCount = canvas.save(); 12542 canvas.scale(scale, scale); 12543 canvas.translate(-mScrollX, -mScrollY); 12544 12545 // Temporarily remove the dirty mask 12546 int flags = mPrivateFlags; 12547 mPrivateFlags &= ~DIRTY_MASK; 12548 12549 // Fast path for layouts with no backgrounds 12550 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12551 dispatchDraw(canvas); 12552 } else { 12553 draw(canvas); 12554 } 12555 12556 mPrivateFlags = flags; 12557 12558 canvas.restoreToCount(restoreCount); 12559 canvas.setBitmap(null); 12560 12561 if (attachInfo != null) { 12562 // Restore the cached Canvas for our siblings 12563 attachInfo.mCanvas = canvas; 12564 } 12565 12566 return bitmap; 12567 } 12568 12569 /** 12570 * Indicates whether this View is currently in edit mode. A View is usually 12571 * in edit mode when displayed within a developer tool. For instance, if 12572 * this View is being drawn by a visual user interface builder, this method 12573 * should return true. 12574 * 12575 * Subclasses should check the return value of this method to provide 12576 * different behaviors if their normal behavior might interfere with the 12577 * host environment. For instance: the class spawns a thread in its 12578 * constructor, the drawing code relies on device-specific features, etc. 12579 * 12580 * This method is usually checked in the drawing code of custom widgets. 12581 * 12582 * @return True if this View is in edit mode, false otherwise. 12583 */ 12584 public boolean isInEditMode() { 12585 return false; 12586 } 12587 12588 /** 12589 * If the View draws content inside its padding and enables fading edges, 12590 * it needs to support padding offsets. Padding offsets are added to the 12591 * fading edges to extend the length of the fade so that it covers pixels 12592 * drawn inside the padding. 12593 * 12594 * Subclasses of this class should override this method if they need 12595 * to draw content inside the padding. 12596 * 12597 * @return True if padding offset must be applied, false otherwise. 12598 * 12599 * @see #getLeftPaddingOffset() 12600 * @see #getRightPaddingOffset() 12601 * @see #getTopPaddingOffset() 12602 * @see #getBottomPaddingOffset() 12603 * 12604 * @since CURRENT 12605 */ 12606 protected boolean isPaddingOffsetRequired() { 12607 return false; 12608 } 12609 12610 /** 12611 * Amount by which to extend the left fading region. Called only when 12612 * {@link #isPaddingOffsetRequired()} returns true. 12613 * 12614 * @return The left padding offset in pixels. 12615 * 12616 * @see #isPaddingOffsetRequired() 12617 * 12618 * @since CURRENT 12619 */ 12620 protected int getLeftPaddingOffset() { 12621 return 0; 12622 } 12623 12624 /** 12625 * Amount by which to extend the right fading region. Called only when 12626 * {@link #isPaddingOffsetRequired()} returns true. 12627 * 12628 * @return The right padding offset in pixels. 12629 * 12630 * @see #isPaddingOffsetRequired() 12631 * 12632 * @since CURRENT 12633 */ 12634 protected int getRightPaddingOffset() { 12635 return 0; 12636 } 12637 12638 /** 12639 * Amount by which to extend the top fading region. Called only when 12640 * {@link #isPaddingOffsetRequired()} returns true. 12641 * 12642 * @return The top padding offset in pixels. 12643 * 12644 * @see #isPaddingOffsetRequired() 12645 * 12646 * @since CURRENT 12647 */ 12648 protected int getTopPaddingOffset() { 12649 return 0; 12650 } 12651 12652 /** 12653 * Amount by which to extend the bottom fading region. Called only when 12654 * {@link #isPaddingOffsetRequired()} returns true. 12655 * 12656 * @return The bottom padding offset in pixels. 12657 * 12658 * @see #isPaddingOffsetRequired() 12659 * 12660 * @since CURRENT 12661 */ 12662 protected int getBottomPaddingOffset() { 12663 return 0; 12664 } 12665 12666 /** 12667 * @hide 12668 * @param offsetRequired 12669 */ 12670 protected int getFadeTop(boolean offsetRequired) { 12671 int top = mPaddingTop; 12672 if (offsetRequired) top += getTopPaddingOffset(); 12673 return top; 12674 } 12675 12676 /** 12677 * @hide 12678 * @param offsetRequired 12679 */ 12680 protected int getFadeHeight(boolean offsetRequired) { 12681 int padding = mPaddingTop; 12682 if (offsetRequired) padding += getTopPaddingOffset(); 12683 return mBottom - mTop - mPaddingBottom - padding; 12684 } 12685 12686 /** 12687 * <p>Indicates whether this view is attached to a hardware accelerated 12688 * window or not.</p> 12689 * 12690 * <p>Even if this method returns true, it does not mean that every call 12691 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12692 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12693 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12694 * window is hardware accelerated, 12695 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12696 * return false, and this method will return true.</p> 12697 * 12698 * @return True if the view is attached to a window and the window is 12699 * hardware accelerated; false in any other case. 12700 */ 12701 public boolean isHardwareAccelerated() { 12702 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12703 } 12704 12705 /** 12706 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12707 * case of an active Animation being run on the view. 12708 */ 12709 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12710 Animation a, boolean scalingRequired) { 12711 Transformation invalidationTransform; 12712 final int flags = parent.mGroupFlags; 12713 final boolean initialized = a.isInitialized(); 12714 if (!initialized) { 12715 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12716 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12717 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 12718 onAnimationStart(); 12719 } 12720 12721 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12722 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12723 if (parent.mInvalidationTransformation == null) { 12724 parent.mInvalidationTransformation = new Transformation(); 12725 } 12726 invalidationTransform = parent.mInvalidationTransformation; 12727 a.getTransformation(drawingTime, invalidationTransform, 1f); 12728 } else { 12729 invalidationTransform = parent.mChildTransformation; 12730 } 12731 12732 if (more) { 12733 if (!a.willChangeBounds()) { 12734 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12735 parent.FLAG_OPTIMIZE_INVALIDATE) { 12736 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12737 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12738 // The child need to draw an animation, potentially offscreen, so 12739 // make sure we do not cancel invalidate requests 12740 parent.mPrivateFlags |= DRAW_ANIMATION; 12741 parent.invalidate(mLeft, mTop, mRight, mBottom); 12742 } 12743 } else { 12744 if (parent.mInvalidateRegion == null) { 12745 parent.mInvalidateRegion = new RectF(); 12746 } 12747 final RectF region = parent.mInvalidateRegion; 12748 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12749 invalidationTransform); 12750 12751 // The child need to draw an animation, potentially offscreen, so 12752 // make sure we do not cancel invalidate requests 12753 parent.mPrivateFlags |= DRAW_ANIMATION; 12754 12755 final int left = mLeft + (int) region.left; 12756 final int top = mTop + (int) region.top; 12757 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12758 top + (int) (region.height() + .5f)); 12759 } 12760 } 12761 return more; 12762 } 12763 12764 /** 12765 * This method is called by getDisplayList() when a display list is created or re-rendered. 12766 * It sets or resets the current value of all properties on that display list (resetting is 12767 * necessary when a display list is being re-created, because we need to make sure that 12768 * previously-set transform values 12769 */ 12770 void setDisplayListProperties(DisplayList displayList) { 12771 if (displayList != null) { 12772 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12773 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12774 if (mParent instanceof ViewGroup) { 12775 displayList.setClipChildren( 12776 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12777 } 12778 float alpha = 1; 12779 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12780 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12781 ViewGroup parentVG = (ViewGroup) mParent; 12782 final boolean hasTransform = 12783 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12784 if (hasTransform) { 12785 Transformation transform = parentVG.mChildTransformation; 12786 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12787 if (transformType != Transformation.TYPE_IDENTITY) { 12788 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12789 alpha = transform.getAlpha(); 12790 } 12791 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12792 displayList.setStaticMatrix(transform.getMatrix()); 12793 } 12794 } 12795 } 12796 } 12797 if (mTransformationInfo != null) { 12798 alpha *= mTransformationInfo.mAlpha; 12799 if (alpha < 1) { 12800 final int multipliedAlpha = (int) (255 * alpha); 12801 if (onSetAlpha(multipliedAlpha)) { 12802 alpha = 1; 12803 } 12804 } 12805 displayList.setTransformationInfo(alpha, 12806 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12807 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12808 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12809 mTransformationInfo.mScaleY); 12810 if (mTransformationInfo.mCamera == null) { 12811 mTransformationInfo.mCamera = new Camera(); 12812 mTransformationInfo.matrix3D = new Matrix(); 12813 } 12814 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12815 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12816 displayList.setPivotX(getPivotX()); 12817 displayList.setPivotY(getPivotY()); 12818 } 12819 } else if (alpha < 1) { 12820 displayList.setAlpha(alpha); 12821 } 12822 } 12823 } 12824 12825 /** 12826 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12827 * This draw() method is an implementation detail and is not intended to be overridden or 12828 * to be called from anywhere else other than ViewGroup.drawChild(). 12829 */ 12830 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12831 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12832 boolean more = false; 12833 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12834 final int flags = parent.mGroupFlags; 12835 12836 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12837 parent.mChildTransformation.clear(); 12838 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12839 } 12840 12841 Transformation transformToApply = null; 12842 boolean concatMatrix = false; 12843 12844 boolean scalingRequired = false; 12845 boolean caching; 12846 int layerType = getLayerType(); 12847 12848 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12849 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12850 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12851 caching = true; 12852 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12853 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12854 } else { 12855 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12856 } 12857 12858 final Animation a = getAnimation(); 12859 if (a != null) { 12860 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12861 concatMatrix = a.willChangeTransformationMatrix(); 12862 if (concatMatrix) { 12863 mPrivateFlags3 |= VIEW_IS_ANIMATING_TRANSFORM; 12864 } 12865 transformToApply = parent.mChildTransformation; 12866 } else { 12867 if ((mPrivateFlags3 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12868 mDisplayList != null) { 12869 // No longer animating: clear out old animation matrix 12870 mDisplayList.setAnimationMatrix(null); 12871 mPrivateFlags3 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12872 } 12873 if (!useDisplayListProperties && 12874 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12875 final boolean hasTransform = 12876 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12877 if (hasTransform) { 12878 final int transformType = parent.mChildTransformation.getTransformationType(); 12879 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12880 parent.mChildTransformation : null; 12881 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12882 } 12883 } 12884 } 12885 12886 concatMatrix |= !childHasIdentityMatrix; 12887 12888 // Sets the flag as early as possible to allow draw() implementations 12889 // to call invalidate() successfully when doing animations 12890 mPrivateFlags |= DRAWN; 12891 12892 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12893 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12894 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12895 return more; 12896 } 12897 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12898 12899 if (hardwareAccelerated) { 12900 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12901 // retain the flag's value temporarily in the mRecreateDisplayList flag 12902 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12903 mPrivateFlags &= ~INVALIDATED; 12904 } 12905 12906 computeScroll(); 12907 12908 final int sx = mScrollX; 12909 final int sy = mScrollY; 12910 12911 DisplayList displayList = null; 12912 Bitmap cache = null; 12913 boolean hasDisplayList = false; 12914 if (caching) { 12915 if (!hardwareAccelerated) { 12916 if (layerType != LAYER_TYPE_NONE) { 12917 layerType = LAYER_TYPE_SOFTWARE; 12918 buildDrawingCache(true); 12919 } 12920 cache = getDrawingCache(true); 12921 } else { 12922 switch (layerType) { 12923 case LAYER_TYPE_SOFTWARE: 12924 if (useDisplayListProperties) { 12925 hasDisplayList = canHaveDisplayList(); 12926 } else { 12927 buildDrawingCache(true); 12928 cache = getDrawingCache(true); 12929 } 12930 break; 12931 case LAYER_TYPE_HARDWARE: 12932 if (useDisplayListProperties) { 12933 hasDisplayList = canHaveDisplayList(); 12934 } 12935 break; 12936 case LAYER_TYPE_NONE: 12937 // Delay getting the display list until animation-driven alpha values are 12938 // set up and possibly passed on to the view 12939 hasDisplayList = canHaveDisplayList(); 12940 break; 12941 } 12942 } 12943 } 12944 useDisplayListProperties &= hasDisplayList; 12945 if (useDisplayListProperties) { 12946 displayList = getDisplayList(); 12947 if (!displayList.isValid()) { 12948 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12949 // to getDisplayList(), the display list will be marked invalid and we should not 12950 // try to use it again. 12951 displayList = null; 12952 hasDisplayList = false; 12953 useDisplayListProperties = false; 12954 } 12955 } 12956 12957 final boolean hasNoCache = cache == null || hasDisplayList; 12958 final boolean offsetForScroll = cache == null && !hasDisplayList && 12959 layerType != LAYER_TYPE_HARDWARE; 12960 12961 int restoreTo = -1; 12962 if (!useDisplayListProperties || transformToApply != null) { 12963 restoreTo = canvas.save(); 12964 } 12965 if (offsetForScroll) { 12966 canvas.translate(mLeft - sx, mTop - sy); 12967 } else { 12968 if (!useDisplayListProperties) { 12969 canvas.translate(mLeft, mTop); 12970 } 12971 if (scalingRequired) { 12972 if (useDisplayListProperties) { 12973 // TODO: Might not need this if we put everything inside the DL 12974 restoreTo = canvas.save(); 12975 } 12976 // mAttachInfo cannot be null, otherwise scalingRequired == false 12977 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12978 canvas.scale(scale, scale); 12979 } 12980 } 12981 12982 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12983 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 12984 (mPrivateFlags3 & VIEW_IS_ANIMATING_ALPHA) == VIEW_IS_ANIMATING_ALPHA) { 12985 if (transformToApply != null || !childHasIdentityMatrix) { 12986 int transX = 0; 12987 int transY = 0; 12988 12989 if (offsetForScroll) { 12990 transX = -sx; 12991 transY = -sy; 12992 } 12993 12994 if (transformToApply != null) { 12995 if (concatMatrix) { 12996 if (useDisplayListProperties) { 12997 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12998 } else { 12999 // Undo the scroll translation, apply the transformation matrix, 13000 // then redo the scroll translate to get the correct result. 13001 canvas.translate(-transX, -transY); 13002 canvas.concat(transformToApply.getMatrix()); 13003 canvas.translate(transX, transY); 13004 } 13005 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13006 } 13007 13008 float transformAlpha = transformToApply.getAlpha(); 13009 if (transformAlpha < 1) { 13010 alpha *= transformAlpha; 13011 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13012 } 13013 } 13014 13015 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13016 canvas.translate(-transX, -transY); 13017 canvas.concat(getMatrix()); 13018 canvas.translate(transX, transY); 13019 } 13020 } 13021 13022 // Deal with alpha if it is or used to be <1 13023 if (alpha < 1 || 13024 (mPrivateFlags3 & VIEW_IS_ANIMATING_ALPHA) == VIEW_IS_ANIMATING_ALPHA) { 13025 if (alpha < 1) { 13026 mPrivateFlags3 |= VIEW_IS_ANIMATING_ALPHA; 13027 } else { 13028 mPrivateFlags3 &= ~VIEW_IS_ANIMATING_ALPHA; 13029 } 13030 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13031 if (hasNoCache) { 13032 final int multipliedAlpha = (int) (255 * alpha); 13033 if (!onSetAlpha(multipliedAlpha)) { 13034 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13035 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13036 layerType != LAYER_TYPE_NONE) { 13037 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13038 } 13039 if (useDisplayListProperties) { 13040 displayList.setAlpha(alpha * getAlpha()); 13041 } else if (layerType == LAYER_TYPE_NONE) { 13042 final int scrollX = hasDisplayList ? 0 : sx; 13043 final int scrollY = hasDisplayList ? 0 : sy; 13044 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13045 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13046 } 13047 } else { 13048 // Alpha is handled by the child directly, clobber the layer's alpha 13049 mPrivateFlags |= ALPHA_SET; 13050 } 13051 } 13052 } 13053 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13054 onSetAlpha(255); 13055 mPrivateFlags &= ~ALPHA_SET; 13056 } 13057 13058 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13059 !useDisplayListProperties) { 13060 if (offsetForScroll) { 13061 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13062 } else { 13063 if (!scalingRequired || cache == null) { 13064 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13065 } else { 13066 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13067 } 13068 } 13069 } 13070 13071 if (!useDisplayListProperties && hasDisplayList) { 13072 displayList = getDisplayList(); 13073 if (!displayList.isValid()) { 13074 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13075 // to getDisplayList(), the display list will be marked invalid and we should not 13076 // try to use it again. 13077 displayList = null; 13078 hasDisplayList = false; 13079 } 13080 } 13081 13082 if (hasNoCache) { 13083 boolean layerRendered = false; 13084 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13085 final HardwareLayer layer = getHardwareLayer(); 13086 if (layer != null && layer.isValid()) { 13087 mLayerPaint.setAlpha((int) (alpha * 255)); 13088 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13089 layerRendered = true; 13090 } else { 13091 final int scrollX = hasDisplayList ? 0 : sx; 13092 final int scrollY = hasDisplayList ? 0 : sy; 13093 canvas.saveLayer(scrollX, scrollY, 13094 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13095 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13096 } 13097 } 13098 13099 if (!layerRendered) { 13100 if (!hasDisplayList) { 13101 // Fast path for layouts with no backgrounds 13102 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13103 mPrivateFlags &= ~DIRTY_MASK; 13104 dispatchDraw(canvas); 13105 } else { 13106 draw(canvas); 13107 } 13108 } else { 13109 mPrivateFlags &= ~DIRTY_MASK; 13110 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13111 } 13112 } 13113 } else if (cache != null) { 13114 mPrivateFlags &= ~DIRTY_MASK; 13115 Paint cachePaint; 13116 13117 if (layerType == LAYER_TYPE_NONE) { 13118 cachePaint = parent.mCachePaint; 13119 if (cachePaint == null) { 13120 cachePaint = new Paint(); 13121 cachePaint.setDither(false); 13122 parent.mCachePaint = cachePaint; 13123 } 13124 if (alpha < 1) { 13125 cachePaint.setAlpha((int) (alpha * 255)); 13126 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13127 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13128 cachePaint.setAlpha(255); 13129 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13130 } 13131 } else { 13132 cachePaint = mLayerPaint; 13133 cachePaint.setAlpha((int) (alpha * 255)); 13134 } 13135 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13136 } 13137 13138 if (restoreTo >= 0) { 13139 canvas.restoreToCount(restoreTo); 13140 } 13141 13142 if (a != null && !more) { 13143 if (!hardwareAccelerated && !a.getFillAfter()) { 13144 onSetAlpha(255); 13145 } 13146 parent.finishAnimatingView(this, a); 13147 } 13148 13149 if (more && hardwareAccelerated) { 13150 // invalidation is the trigger to recreate display lists, so if we're using 13151 // display lists to render, force an invalidate to allow the animation to 13152 // continue drawing another frame 13153 parent.invalidate(true); 13154 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13155 // alpha animations should cause the child to recreate its display list 13156 invalidate(true); 13157 } 13158 } 13159 13160 mRecreateDisplayList = false; 13161 13162 return more; 13163 } 13164 13165 /** 13166 * Manually render this view (and all of its children) to the given Canvas. 13167 * The view must have already done a full layout before this function is 13168 * called. When implementing a view, implement 13169 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13170 * If you do need to override this method, call the superclass version. 13171 * 13172 * @param canvas The Canvas to which the View is rendered. 13173 */ 13174 public void draw(Canvas canvas) { 13175 final int privateFlags = mPrivateFlags; 13176 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13177 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13178 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13179 13180 /* 13181 * Draw traversal performs several drawing steps which must be executed 13182 * in the appropriate order: 13183 * 13184 * 1. Draw the background 13185 * 2. If necessary, save the canvas' layers to prepare for fading 13186 * 3. Draw view's content 13187 * 4. Draw children 13188 * 5. If necessary, draw the fading edges and restore layers 13189 * 6. Draw decorations (scrollbars for instance) 13190 */ 13191 13192 // Step 1, draw the background, if needed 13193 int saveCount; 13194 13195 if (!dirtyOpaque) { 13196 final Drawable background = mBackground; 13197 if (background != null) { 13198 final int scrollX = mScrollX; 13199 final int scrollY = mScrollY; 13200 13201 if (mBackgroundSizeChanged) { 13202 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13203 mBackgroundSizeChanged = false; 13204 } 13205 13206 if ((scrollX | scrollY) == 0) { 13207 background.draw(canvas); 13208 } else { 13209 canvas.translate(scrollX, scrollY); 13210 background.draw(canvas); 13211 canvas.translate(-scrollX, -scrollY); 13212 } 13213 } 13214 } 13215 13216 // skip step 2 & 5 if possible (common case) 13217 final int viewFlags = mViewFlags; 13218 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13219 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13220 if (!verticalEdges && !horizontalEdges) { 13221 // Step 3, draw the content 13222 if (!dirtyOpaque) onDraw(canvas); 13223 13224 // Step 4, draw the children 13225 dispatchDraw(canvas); 13226 13227 // Step 6, draw decorations (scrollbars) 13228 onDrawScrollBars(canvas); 13229 13230 // we're done... 13231 return; 13232 } 13233 13234 /* 13235 * Here we do the full fledged routine... 13236 * (this is an uncommon case where speed matters less, 13237 * this is why we repeat some of the tests that have been 13238 * done above) 13239 */ 13240 13241 boolean drawTop = false; 13242 boolean drawBottom = false; 13243 boolean drawLeft = false; 13244 boolean drawRight = false; 13245 13246 float topFadeStrength = 0.0f; 13247 float bottomFadeStrength = 0.0f; 13248 float leftFadeStrength = 0.0f; 13249 float rightFadeStrength = 0.0f; 13250 13251 // Step 2, save the canvas' layers 13252 int paddingLeft = mPaddingLeft; 13253 13254 final boolean offsetRequired = isPaddingOffsetRequired(); 13255 if (offsetRequired) { 13256 paddingLeft += getLeftPaddingOffset(); 13257 } 13258 13259 int left = mScrollX + paddingLeft; 13260 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13261 int top = mScrollY + getFadeTop(offsetRequired); 13262 int bottom = top + getFadeHeight(offsetRequired); 13263 13264 if (offsetRequired) { 13265 right += getRightPaddingOffset(); 13266 bottom += getBottomPaddingOffset(); 13267 } 13268 13269 final ScrollabilityCache scrollabilityCache = mScrollCache; 13270 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13271 int length = (int) fadeHeight; 13272 13273 // clip the fade length if top and bottom fades overlap 13274 // overlapping fades produce odd-looking artifacts 13275 if (verticalEdges && (top + length > bottom - length)) { 13276 length = (bottom - top) / 2; 13277 } 13278 13279 // also clip horizontal fades if necessary 13280 if (horizontalEdges && (left + length > right - length)) { 13281 length = (right - left) / 2; 13282 } 13283 13284 if (verticalEdges) { 13285 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13286 drawTop = topFadeStrength * fadeHeight > 1.0f; 13287 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13288 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13289 } 13290 13291 if (horizontalEdges) { 13292 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13293 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13294 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13295 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13296 } 13297 13298 saveCount = canvas.getSaveCount(); 13299 13300 int solidColor = getSolidColor(); 13301 if (solidColor == 0) { 13302 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13303 13304 if (drawTop) { 13305 canvas.saveLayer(left, top, right, top + length, null, flags); 13306 } 13307 13308 if (drawBottom) { 13309 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13310 } 13311 13312 if (drawLeft) { 13313 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13314 } 13315 13316 if (drawRight) { 13317 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13318 } 13319 } else { 13320 scrollabilityCache.setFadeColor(solidColor); 13321 } 13322 13323 // Step 3, draw the content 13324 if (!dirtyOpaque) onDraw(canvas); 13325 13326 // Step 4, draw the children 13327 dispatchDraw(canvas); 13328 13329 // Step 5, draw the fade effect and restore layers 13330 final Paint p = scrollabilityCache.paint; 13331 final Matrix matrix = scrollabilityCache.matrix; 13332 final Shader fade = scrollabilityCache.shader; 13333 13334 if (drawTop) { 13335 matrix.setScale(1, fadeHeight * topFadeStrength); 13336 matrix.postTranslate(left, top); 13337 fade.setLocalMatrix(matrix); 13338 canvas.drawRect(left, top, right, top + length, p); 13339 } 13340 13341 if (drawBottom) { 13342 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13343 matrix.postRotate(180); 13344 matrix.postTranslate(left, bottom); 13345 fade.setLocalMatrix(matrix); 13346 canvas.drawRect(left, bottom - length, right, bottom, p); 13347 } 13348 13349 if (drawLeft) { 13350 matrix.setScale(1, fadeHeight * leftFadeStrength); 13351 matrix.postRotate(-90); 13352 matrix.postTranslate(left, top); 13353 fade.setLocalMatrix(matrix); 13354 canvas.drawRect(left, top, left + length, bottom, p); 13355 } 13356 13357 if (drawRight) { 13358 matrix.setScale(1, fadeHeight * rightFadeStrength); 13359 matrix.postRotate(90); 13360 matrix.postTranslate(right, top); 13361 fade.setLocalMatrix(matrix); 13362 canvas.drawRect(right - length, top, right, bottom, p); 13363 } 13364 13365 canvas.restoreToCount(saveCount); 13366 13367 // Step 6, draw decorations (scrollbars) 13368 onDrawScrollBars(canvas); 13369 } 13370 13371 /** 13372 * Override this if your view is known to always be drawn on top of a solid color background, 13373 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13374 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13375 * should be set to 0xFF. 13376 * 13377 * @see #setVerticalFadingEdgeEnabled(boolean) 13378 * @see #setHorizontalFadingEdgeEnabled(boolean) 13379 * 13380 * @return The known solid color background for this view, or 0 if the color may vary 13381 */ 13382 @ViewDebug.ExportedProperty(category = "drawing") 13383 public int getSolidColor() { 13384 return 0; 13385 } 13386 13387 /** 13388 * Build a human readable string representation of the specified view flags. 13389 * 13390 * @param flags the view flags to convert to a string 13391 * @return a String representing the supplied flags 13392 */ 13393 private static String printFlags(int flags) { 13394 String output = ""; 13395 int numFlags = 0; 13396 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13397 output += "TAKES_FOCUS"; 13398 numFlags++; 13399 } 13400 13401 switch (flags & VISIBILITY_MASK) { 13402 case INVISIBLE: 13403 if (numFlags > 0) { 13404 output += " "; 13405 } 13406 output += "INVISIBLE"; 13407 // USELESS HERE numFlags++; 13408 break; 13409 case GONE: 13410 if (numFlags > 0) { 13411 output += " "; 13412 } 13413 output += "GONE"; 13414 // USELESS HERE numFlags++; 13415 break; 13416 default: 13417 break; 13418 } 13419 return output; 13420 } 13421 13422 /** 13423 * Build a human readable string representation of the specified private 13424 * view flags. 13425 * 13426 * @param privateFlags the private view flags to convert to a string 13427 * @return a String representing the supplied flags 13428 */ 13429 private static String printPrivateFlags(int privateFlags) { 13430 String output = ""; 13431 int numFlags = 0; 13432 13433 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13434 output += "WANTS_FOCUS"; 13435 numFlags++; 13436 } 13437 13438 if ((privateFlags & FOCUSED) == FOCUSED) { 13439 if (numFlags > 0) { 13440 output += " "; 13441 } 13442 output += "FOCUSED"; 13443 numFlags++; 13444 } 13445 13446 if ((privateFlags & SELECTED) == SELECTED) { 13447 if (numFlags > 0) { 13448 output += " "; 13449 } 13450 output += "SELECTED"; 13451 numFlags++; 13452 } 13453 13454 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13455 if (numFlags > 0) { 13456 output += " "; 13457 } 13458 output += "IS_ROOT_NAMESPACE"; 13459 numFlags++; 13460 } 13461 13462 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13463 if (numFlags > 0) { 13464 output += " "; 13465 } 13466 output += "HAS_BOUNDS"; 13467 numFlags++; 13468 } 13469 13470 if ((privateFlags & DRAWN) == DRAWN) { 13471 if (numFlags > 0) { 13472 output += " "; 13473 } 13474 output += "DRAWN"; 13475 // USELESS HERE numFlags++; 13476 } 13477 return output; 13478 } 13479 13480 /** 13481 * <p>Indicates whether or not this view's layout will be requested during 13482 * the next hierarchy layout pass.</p> 13483 * 13484 * @return true if the layout will be forced during next layout pass 13485 */ 13486 public boolean isLayoutRequested() { 13487 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13488 } 13489 13490 /** 13491 * Assign a size and position to a view and all of its 13492 * descendants 13493 * 13494 * <p>This is the second phase of the layout mechanism. 13495 * (The first is measuring). In this phase, each parent calls 13496 * layout on all of its children to position them. 13497 * This is typically done using the child measurements 13498 * that were stored in the measure pass().</p> 13499 * 13500 * <p>Derived classes should not override this method. 13501 * Derived classes with children should override 13502 * onLayout. In that method, they should 13503 * call layout on each of their children.</p> 13504 * 13505 * @param l Left position, relative to parent 13506 * @param t Top position, relative to parent 13507 * @param r Right position, relative to parent 13508 * @param b Bottom position, relative to parent 13509 */ 13510 @SuppressWarnings({"unchecked"}) 13511 public void layout(int l, int t, int r, int b) { 13512 int oldL = mLeft; 13513 int oldT = mTop; 13514 int oldB = mBottom; 13515 int oldR = mRight; 13516 boolean changed = setFrame(l, t, r, b); 13517 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13518 onLayout(changed, l, t, r, b); 13519 mPrivateFlags &= ~LAYOUT_REQUIRED; 13520 13521 ListenerInfo li = mListenerInfo; 13522 if (li != null && li.mOnLayoutChangeListeners != null) { 13523 ArrayList<OnLayoutChangeListener> listenersCopy = 13524 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13525 int numListeners = listenersCopy.size(); 13526 for (int i = 0; i < numListeners; ++i) { 13527 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13528 } 13529 } 13530 } 13531 mPrivateFlags &= ~FORCE_LAYOUT; 13532 } 13533 13534 /** 13535 * Called from layout when this view should 13536 * assign a size and position to each of its children. 13537 * 13538 * Derived classes with children should override 13539 * this method and call layout on each of 13540 * their children. 13541 * @param changed This is a new size or position for this view 13542 * @param left Left position, relative to parent 13543 * @param top Top position, relative to parent 13544 * @param right Right position, relative to parent 13545 * @param bottom Bottom position, relative to parent 13546 */ 13547 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13548 } 13549 13550 /** 13551 * Assign a size and position to this view. 13552 * 13553 * This is called from layout. 13554 * 13555 * @param left Left position, relative to parent 13556 * @param top Top position, relative to parent 13557 * @param right Right position, relative to parent 13558 * @param bottom Bottom position, relative to parent 13559 * @return true if the new size and position are different than the 13560 * previous ones 13561 * {@hide} 13562 */ 13563 protected boolean setFrame(int left, int top, int right, int bottom) { 13564 boolean changed = false; 13565 13566 if (DBG) { 13567 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13568 + right + "," + bottom + ")"); 13569 } 13570 13571 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13572 changed = true; 13573 13574 // Remember our drawn bit 13575 int drawn = mPrivateFlags & DRAWN; 13576 13577 int oldWidth = mRight - mLeft; 13578 int oldHeight = mBottom - mTop; 13579 int newWidth = right - left; 13580 int newHeight = bottom - top; 13581 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13582 13583 // Invalidate our old position 13584 invalidate(sizeChanged); 13585 13586 mLeft = left; 13587 mTop = top; 13588 mRight = right; 13589 mBottom = bottom; 13590 if (mDisplayList != null) { 13591 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13592 } 13593 13594 mPrivateFlags |= HAS_BOUNDS; 13595 13596 13597 if (sizeChanged) { 13598 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13599 // A change in dimension means an auto-centered pivot point changes, too 13600 if (mTransformationInfo != null) { 13601 mTransformationInfo.mMatrixDirty = true; 13602 } 13603 } 13604 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13605 } 13606 13607 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13608 // If we are visible, force the DRAWN bit to on so that 13609 // this invalidate will go through (at least to our parent). 13610 // This is because someone may have invalidated this view 13611 // before this call to setFrame came in, thereby clearing 13612 // the DRAWN bit. 13613 mPrivateFlags |= DRAWN; 13614 invalidate(sizeChanged); 13615 // parent display list may need to be recreated based on a change in the bounds 13616 // of any child 13617 invalidateParentCaches(); 13618 } 13619 13620 // Reset drawn bit to original value (invalidate turns it off) 13621 mPrivateFlags |= drawn; 13622 13623 mBackgroundSizeChanged = true; 13624 } 13625 return changed; 13626 } 13627 13628 /** 13629 * Finalize inflating a view from XML. This is called as the last phase 13630 * of inflation, after all child views have been added. 13631 * 13632 * <p>Even if the subclass overrides onFinishInflate, they should always be 13633 * sure to call the super method, so that we get called. 13634 */ 13635 protected void onFinishInflate() { 13636 } 13637 13638 /** 13639 * Returns the resources associated with this view. 13640 * 13641 * @return Resources object. 13642 */ 13643 public Resources getResources() { 13644 return mResources; 13645 } 13646 13647 /** 13648 * Invalidates the specified Drawable. 13649 * 13650 * @param drawable the drawable to invalidate 13651 */ 13652 public void invalidateDrawable(Drawable drawable) { 13653 if (verifyDrawable(drawable)) { 13654 final Rect dirty = drawable.getBounds(); 13655 final int scrollX = mScrollX; 13656 final int scrollY = mScrollY; 13657 13658 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13659 dirty.right + scrollX, dirty.bottom + scrollY); 13660 } 13661 } 13662 13663 /** 13664 * Schedules an action on a drawable to occur at a specified time. 13665 * 13666 * @param who the recipient of the action 13667 * @param what the action to run on the drawable 13668 * @param when the time at which the action must occur. Uses the 13669 * {@link SystemClock#uptimeMillis} timebase. 13670 */ 13671 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13672 if (verifyDrawable(who) && what != null) { 13673 final long delay = when - SystemClock.uptimeMillis(); 13674 if (mAttachInfo != null) { 13675 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13676 Choreographer.CALLBACK_ANIMATION, what, who, 13677 Choreographer.subtractFrameDelay(delay)); 13678 } else { 13679 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13680 } 13681 } 13682 } 13683 13684 /** 13685 * Cancels a scheduled action on a drawable. 13686 * 13687 * @param who the recipient of the action 13688 * @param what the action to cancel 13689 */ 13690 public void unscheduleDrawable(Drawable who, Runnable what) { 13691 if (verifyDrawable(who) && what != null) { 13692 if (mAttachInfo != null) { 13693 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13694 Choreographer.CALLBACK_ANIMATION, what, who); 13695 } else { 13696 ViewRootImpl.getRunQueue().removeCallbacks(what); 13697 } 13698 } 13699 } 13700 13701 /** 13702 * Unschedule any events associated with the given Drawable. This can be 13703 * used when selecting a new Drawable into a view, so that the previous 13704 * one is completely unscheduled. 13705 * 13706 * @param who The Drawable to unschedule. 13707 * 13708 * @see #drawableStateChanged 13709 */ 13710 public void unscheduleDrawable(Drawable who) { 13711 if (mAttachInfo != null && who != null) { 13712 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13713 Choreographer.CALLBACK_ANIMATION, null, who); 13714 } 13715 } 13716 13717 /** 13718 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 13719 * that the View directionality can and will be resolved before its Drawables. 13720 * 13721 * Will call {@link View#onResolveDrawables} when resolution is done. 13722 */ 13723 public void resolveDrawables() { 13724 if (mBackground != null) { 13725 mBackground.setLayoutDirection(getResolvedLayoutDirection()); 13726 } 13727 onResolveDrawables(getResolvedLayoutDirection()); 13728 } 13729 13730 /** 13731 * Called when layout direction has been resolved. 13732 * 13733 * The default implementation does nothing. 13734 * 13735 * @param layoutDirection The resolved layout direction. 13736 * 13737 * @see {@link #LAYOUT_DIRECTION_LTR} 13738 * @see {@link #LAYOUT_DIRECTION_RTL} 13739 */ 13740 public void onResolveDrawables(int layoutDirection) { 13741 } 13742 13743 /** 13744 * If your view subclass is displaying its own Drawable objects, it should 13745 * override this function and return true for any Drawable it is 13746 * displaying. This allows animations for those drawables to be 13747 * scheduled. 13748 * 13749 * <p>Be sure to call through to the super class when overriding this 13750 * function. 13751 * 13752 * @param who The Drawable to verify. Return true if it is one you are 13753 * displaying, else return the result of calling through to the 13754 * super class. 13755 * 13756 * @return boolean If true than the Drawable is being displayed in the 13757 * view; else false and it is not allowed to animate. 13758 * 13759 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13760 * @see #drawableStateChanged() 13761 */ 13762 protected boolean verifyDrawable(Drawable who) { 13763 return who == mBackground; 13764 } 13765 13766 /** 13767 * This function is called whenever the state of the view changes in such 13768 * a way that it impacts the state of drawables being shown. 13769 * 13770 * <p>Be sure to call through to the superclass when overriding this 13771 * function. 13772 * 13773 * @see Drawable#setState(int[]) 13774 */ 13775 protected void drawableStateChanged() { 13776 Drawable d = mBackground; 13777 if (d != null && d.isStateful()) { 13778 d.setState(getDrawableState()); 13779 } 13780 } 13781 13782 /** 13783 * Call this to force a view to update its drawable state. This will cause 13784 * drawableStateChanged to be called on this view. Views that are interested 13785 * in the new state should call getDrawableState. 13786 * 13787 * @see #drawableStateChanged 13788 * @see #getDrawableState 13789 */ 13790 public void refreshDrawableState() { 13791 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13792 drawableStateChanged(); 13793 13794 ViewParent parent = mParent; 13795 if (parent != null) { 13796 parent.childDrawableStateChanged(this); 13797 } 13798 } 13799 13800 /** 13801 * Return an array of resource IDs of the drawable states representing the 13802 * current state of the view. 13803 * 13804 * @return The current drawable state 13805 * 13806 * @see Drawable#setState(int[]) 13807 * @see #drawableStateChanged() 13808 * @see #onCreateDrawableState(int) 13809 */ 13810 public final int[] getDrawableState() { 13811 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13812 return mDrawableState; 13813 } else { 13814 mDrawableState = onCreateDrawableState(0); 13815 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13816 return mDrawableState; 13817 } 13818 } 13819 13820 /** 13821 * Generate the new {@link android.graphics.drawable.Drawable} state for 13822 * this view. This is called by the view 13823 * system when the cached Drawable state is determined to be invalid. To 13824 * retrieve the current state, you should use {@link #getDrawableState}. 13825 * 13826 * @param extraSpace if non-zero, this is the number of extra entries you 13827 * would like in the returned array in which you can place your own 13828 * states. 13829 * 13830 * @return Returns an array holding the current {@link Drawable} state of 13831 * the view. 13832 * 13833 * @see #mergeDrawableStates(int[], int[]) 13834 */ 13835 protected int[] onCreateDrawableState(int extraSpace) { 13836 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13837 mParent instanceof View) { 13838 return ((View) mParent).onCreateDrawableState(extraSpace); 13839 } 13840 13841 int[] drawableState; 13842 13843 int privateFlags = mPrivateFlags; 13844 13845 int viewStateIndex = 0; 13846 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13847 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13848 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13849 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13850 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13851 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13852 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13853 HardwareRenderer.isAvailable()) { 13854 // This is set if HW acceleration is requested, even if the current 13855 // process doesn't allow it. This is just to allow app preview 13856 // windows to better match their app. 13857 viewStateIndex |= VIEW_STATE_ACCELERATED; 13858 } 13859 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13860 13861 final int privateFlags2 = mPrivateFlags2; 13862 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13863 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13864 13865 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13866 13867 //noinspection ConstantIfStatement 13868 if (false) { 13869 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13870 Log.i("View", toString() 13871 + " pressed=" + ((privateFlags & PRESSED) != 0) 13872 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13873 + " fo=" + hasFocus() 13874 + " sl=" + ((privateFlags & SELECTED) != 0) 13875 + " wf=" + hasWindowFocus() 13876 + ": " + Arrays.toString(drawableState)); 13877 } 13878 13879 if (extraSpace == 0) { 13880 return drawableState; 13881 } 13882 13883 final int[] fullState; 13884 if (drawableState != null) { 13885 fullState = new int[drawableState.length + extraSpace]; 13886 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13887 } else { 13888 fullState = new int[extraSpace]; 13889 } 13890 13891 return fullState; 13892 } 13893 13894 /** 13895 * Merge your own state values in <var>additionalState</var> into the base 13896 * state values <var>baseState</var> that were returned by 13897 * {@link #onCreateDrawableState(int)}. 13898 * 13899 * @param baseState The base state values returned by 13900 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13901 * own additional state values. 13902 * 13903 * @param additionalState The additional state values you would like 13904 * added to <var>baseState</var>; this array is not modified. 13905 * 13906 * @return As a convenience, the <var>baseState</var> array you originally 13907 * passed into the function is returned. 13908 * 13909 * @see #onCreateDrawableState(int) 13910 */ 13911 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13912 final int N = baseState.length; 13913 int i = N - 1; 13914 while (i >= 0 && baseState[i] == 0) { 13915 i--; 13916 } 13917 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13918 return baseState; 13919 } 13920 13921 /** 13922 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13923 * on all Drawable objects associated with this view. 13924 */ 13925 public void jumpDrawablesToCurrentState() { 13926 if (mBackground != null) { 13927 mBackground.jumpToCurrentState(); 13928 } 13929 } 13930 13931 /** 13932 * Sets the background color for this view. 13933 * @param color the color of the background 13934 */ 13935 @RemotableViewMethod 13936 public void setBackgroundColor(int color) { 13937 if (mBackground instanceof ColorDrawable) { 13938 ((ColorDrawable) mBackground).setColor(color); 13939 } else { 13940 setBackground(new ColorDrawable(color)); 13941 } 13942 } 13943 13944 /** 13945 * Set the background to a given resource. The resource should refer to 13946 * a Drawable object or 0 to remove the background. 13947 * @param resid The identifier of the resource. 13948 * 13949 * @attr ref android.R.styleable#View_background 13950 */ 13951 @RemotableViewMethod 13952 public void setBackgroundResource(int resid) { 13953 if (resid != 0 && resid == mBackgroundResource) { 13954 return; 13955 } 13956 13957 Drawable d= null; 13958 if (resid != 0) { 13959 d = mResources.getDrawable(resid); 13960 } 13961 setBackground(d); 13962 13963 mBackgroundResource = resid; 13964 } 13965 13966 /** 13967 * Set the background to a given Drawable, or remove the background. If the 13968 * background has padding, this View's padding is set to the background's 13969 * padding. However, when a background is removed, this View's padding isn't 13970 * touched. If setting the padding is desired, please use 13971 * {@link #setPadding(int, int, int, int)}. 13972 * 13973 * @param background The Drawable to use as the background, or null to remove the 13974 * background 13975 */ 13976 public void setBackground(Drawable background) { 13977 //noinspection deprecation 13978 setBackgroundDrawable(background); 13979 } 13980 13981 /** 13982 * @deprecated use {@link #setBackground(Drawable)} instead 13983 */ 13984 @Deprecated 13985 public void setBackgroundDrawable(Drawable background) { 13986 if (background == mBackground) { 13987 return; 13988 } 13989 13990 boolean requestLayout = false; 13991 13992 mBackgroundResource = 0; 13993 13994 /* 13995 * Regardless of whether we're setting a new background or not, we want 13996 * to clear the previous drawable. 13997 */ 13998 if (mBackground != null) { 13999 mBackground.setCallback(null); 14000 unscheduleDrawable(mBackground); 14001 } 14002 14003 if (background != null) { 14004 Rect padding = sThreadLocal.get(); 14005 if (padding == null) { 14006 padding = new Rect(); 14007 sThreadLocal.set(padding); 14008 } 14009 background.setLayoutDirection(getResolvedLayoutDirection()); 14010 if (background.getPadding(padding)) { 14011 switch (background.getLayoutDirection()) { 14012 case LAYOUT_DIRECTION_RTL: 14013 setPadding(padding.right, padding.top, padding.left, padding.bottom); 14014 break; 14015 case LAYOUT_DIRECTION_LTR: 14016 default: 14017 setPadding(padding.left, padding.top, padding.right, padding.bottom); 14018 } 14019 } 14020 14021 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14022 // if it has a different minimum size, we should layout again 14023 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14024 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14025 requestLayout = true; 14026 } 14027 14028 background.setCallback(this); 14029 if (background.isStateful()) { 14030 background.setState(getDrawableState()); 14031 } 14032 background.setVisible(getVisibility() == VISIBLE, false); 14033 mBackground = background; 14034 14035 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14036 mPrivateFlags &= ~SKIP_DRAW; 14037 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14038 requestLayout = true; 14039 } 14040 } else { 14041 /* Remove the background */ 14042 mBackground = null; 14043 14044 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14045 /* 14046 * This view ONLY drew the background before and we're removing 14047 * the background, so now it won't draw anything 14048 * (hence we SKIP_DRAW) 14049 */ 14050 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14051 mPrivateFlags |= SKIP_DRAW; 14052 } 14053 14054 /* 14055 * When the background is set, we try to apply its padding to this 14056 * View. When the background is removed, we don't touch this View's 14057 * padding. This is noted in the Javadocs. Hence, we don't need to 14058 * requestLayout(), the invalidate() below is sufficient. 14059 */ 14060 14061 // The old background's minimum size could have affected this 14062 // View's layout, so let's requestLayout 14063 requestLayout = true; 14064 } 14065 14066 computeOpaqueFlags(); 14067 14068 if (requestLayout) { 14069 requestLayout(); 14070 } 14071 14072 mBackgroundSizeChanged = true; 14073 invalidate(true); 14074 } 14075 14076 /** 14077 * Gets the background drawable 14078 * 14079 * @return The drawable used as the background for this view, if any. 14080 * 14081 * @see #setBackground(Drawable) 14082 * 14083 * @attr ref android.R.styleable#View_background 14084 */ 14085 public Drawable getBackground() { 14086 return mBackground; 14087 } 14088 14089 /** 14090 * Sets the padding. The view may add on the space required to display 14091 * the scrollbars, depending on the style and visibility of the scrollbars. 14092 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14093 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14094 * from the values set in this call. 14095 * 14096 * @attr ref android.R.styleable#View_padding 14097 * @attr ref android.R.styleable#View_paddingBottom 14098 * @attr ref android.R.styleable#View_paddingLeft 14099 * @attr ref android.R.styleable#View_paddingRight 14100 * @attr ref android.R.styleable#View_paddingTop 14101 * @param left the left padding in pixels 14102 * @param top the top padding in pixels 14103 * @param right the right padding in pixels 14104 * @param bottom the bottom padding in pixels 14105 */ 14106 public void setPadding(int left, int top, int right, int bottom) { 14107 mUserPaddingStart = -1; 14108 mUserPaddingEnd = -1; 14109 mUserPaddingRelative = false; 14110 14111 internalSetPadding(left, top, right, bottom); 14112 } 14113 14114 private void internalSetPadding(int left, int top, int right, int bottom) { 14115 mUserPaddingLeft = left; 14116 mUserPaddingRight = right; 14117 mUserPaddingBottom = bottom; 14118 14119 final int viewFlags = mViewFlags; 14120 boolean changed = false; 14121 14122 // Common case is there are no scroll bars. 14123 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14124 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14125 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14126 ? 0 : getVerticalScrollbarWidth(); 14127 switch (mVerticalScrollbarPosition) { 14128 case SCROLLBAR_POSITION_DEFAULT: 14129 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14130 left += offset; 14131 } else { 14132 right += offset; 14133 } 14134 break; 14135 case SCROLLBAR_POSITION_RIGHT: 14136 right += offset; 14137 break; 14138 case SCROLLBAR_POSITION_LEFT: 14139 left += offset; 14140 break; 14141 } 14142 } 14143 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14144 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14145 ? 0 : getHorizontalScrollbarHeight(); 14146 } 14147 } 14148 14149 if (mPaddingLeft != left) { 14150 changed = true; 14151 mPaddingLeft = left; 14152 } 14153 if (mPaddingTop != top) { 14154 changed = true; 14155 mPaddingTop = top; 14156 } 14157 if (mPaddingRight != right) { 14158 changed = true; 14159 mPaddingRight = right; 14160 } 14161 if (mPaddingBottom != bottom) { 14162 changed = true; 14163 mPaddingBottom = bottom; 14164 } 14165 14166 if (changed) { 14167 requestLayout(); 14168 } 14169 } 14170 14171 /** 14172 * Sets the relative padding. The view may add on the space required to display 14173 * the scrollbars, depending on the style and visibility of the scrollbars. 14174 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14175 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14176 * from the values set in this call. 14177 * 14178 * @attr ref android.R.styleable#View_padding 14179 * @attr ref android.R.styleable#View_paddingBottom 14180 * @attr ref android.R.styleable#View_paddingStart 14181 * @attr ref android.R.styleable#View_paddingEnd 14182 * @attr ref android.R.styleable#View_paddingTop 14183 * @param start the start padding in pixels 14184 * @param top the top padding in pixels 14185 * @param end the end padding in pixels 14186 * @param bottom the bottom padding in pixels 14187 */ 14188 public void setPaddingRelative(int start, int top, int end, int bottom) { 14189 mUserPaddingStart = start; 14190 mUserPaddingEnd = end; 14191 mUserPaddingRelative = true; 14192 14193 switch(getResolvedLayoutDirection()) { 14194 case LAYOUT_DIRECTION_RTL: 14195 internalSetPadding(end, top, start, bottom); 14196 break; 14197 case LAYOUT_DIRECTION_LTR: 14198 default: 14199 internalSetPadding(start, top, end, bottom); 14200 } 14201 } 14202 14203 /** 14204 * Returns the top padding of this view. 14205 * 14206 * @return the top padding in pixels 14207 */ 14208 public int getPaddingTop() { 14209 return mPaddingTop; 14210 } 14211 14212 /** 14213 * Returns the bottom padding of this view. If there are inset and enabled 14214 * scrollbars, this value may include the space required to display the 14215 * scrollbars as well. 14216 * 14217 * @return the bottom padding in pixels 14218 */ 14219 public int getPaddingBottom() { 14220 return mPaddingBottom; 14221 } 14222 14223 /** 14224 * Returns the left padding of this view. If there are inset and enabled 14225 * scrollbars, this value may include the space required to display the 14226 * scrollbars as well. 14227 * 14228 * @return the left padding in pixels 14229 */ 14230 public int getPaddingLeft() { 14231 return mPaddingLeft; 14232 } 14233 14234 /** 14235 * Returns the start padding of this view depending on its resolved layout direction. 14236 * If there are inset and enabled scrollbars, this value may include the space 14237 * required to display the scrollbars as well. 14238 * 14239 * @return the start padding in pixels 14240 */ 14241 public int getPaddingStart() { 14242 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14243 mPaddingRight : mPaddingLeft; 14244 } 14245 14246 /** 14247 * Returns the right padding of this view. If there are inset and enabled 14248 * scrollbars, this value may include the space required to display the 14249 * scrollbars as well. 14250 * 14251 * @return the right padding in pixels 14252 */ 14253 public int getPaddingRight() { 14254 return mPaddingRight; 14255 } 14256 14257 /** 14258 * Returns the end padding of this view depending on its resolved layout direction. 14259 * If there are inset and enabled scrollbars, this value may include the space 14260 * required to display the scrollbars as well. 14261 * 14262 * @return the end padding in pixels 14263 */ 14264 public int getPaddingEnd() { 14265 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14266 mPaddingLeft : mPaddingRight; 14267 } 14268 14269 /** 14270 * Return if the padding as been set thru relative values 14271 * {@link #setPaddingRelative(int, int, int, int)} or thru 14272 * @attr ref android.R.styleable#View_paddingStart or 14273 * @attr ref android.R.styleable#View_paddingEnd 14274 * 14275 * @return true if the padding is relative or false if it is not. 14276 */ 14277 public boolean isPaddingRelative() { 14278 return mUserPaddingRelative; 14279 } 14280 14281 /** 14282 * @hide 14283 */ 14284 public Insets getOpticalInsets() { 14285 if (mLayoutInsets == null) { 14286 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14287 } 14288 return mLayoutInsets; 14289 } 14290 14291 /** 14292 * @hide 14293 */ 14294 public void setLayoutInsets(Insets layoutInsets) { 14295 mLayoutInsets = layoutInsets; 14296 } 14297 14298 /** 14299 * Changes the selection state of this view. A view can be selected or not. 14300 * Note that selection is not the same as focus. Views are typically 14301 * selected in the context of an AdapterView like ListView or GridView; 14302 * the selected view is the view that is highlighted. 14303 * 14304 * @param selected true if the view must be selected, false otherwise 14305 */ 14306 public void setSelected(boolean selected) { 14307 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14308 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14309 if (!selected) resetPressedState(); 14310 invalidate(true); 14311 refreshDrawableState(); 14312 dispatchSetSelected(selected); 14313 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14314 notifyAccessibilityStateChanged(); 14315 } 14316 } 14317 } 14318 14319 /** 14320 * Dispatch setSelected to all of this View's children. 14321 * 14322 * @see #setSelected(boolean) 14323 * 14324 * @param selected The new selected state 14325 */ 14326 protected void dispatchSetSelected(boolean selected) { 14327 } 14328 14329 /** 14330 * Indicates the selection state of this view. 14331 * 14332 * @return true if the view is selected, false otherwise 14333 */ 14334 @ViewDebug.ExportedProperty 14335 public boolean isSelected() { 14336 return (mPrivateFlags & SELECTED) != 0; 14337 } 14338 14339 /** 14340 * Changes the activated state of this view. A view can be activated or not. 14341 * Note that activation is not the same as selection. Selection is 14342 * a transient property, representing the view (hierarchy) the user is 14343 * currently interacting with. Activation is a longer-term state that the 14344 * user can move views in and out of. For example, in a list view with 14345 * single or multiple selection enabled, the views in the current selection 14346 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14347 * here.) The activated state is propagated down to children of the view it 14348 * is set on. 14349 * 14350 * @param activated true if the view must be activated, false otherwise 14351 */ 14352 public void setActivated(boolean activated) { 14353 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14354 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14355 invalidate(true); 14356 refreshDrawableState(); 14357 dispatchSetActivated(activated); 14358 } 14359 } 14360 14361 /** 14362 * Dispatch setActivated to all of this View's children. 14363 * 14364 * @see #setActivated(boolean) 14365 * 14366 * @param activated The new activated state 14367 */ 14368 protected void dispatchSetActivated(boolean activated) { 14369 } 14370 14371 /** 14372 * Indicates the activation state of this view. 14373 * 14374 * @return true if the view is activated, false otherwise 14375 */ 14376 @ViewDebug.ExportedProperty 14377 public boolean isActivated() { 14378 return (mPrivateFlags & ACTIVATED) != 0; 14379 } 14380 14381 /** 14382 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14383 * observer can be used to get notifications when global events, like 14384 * layout, happen. 14385 * 14386 * The returned ViewTreeObserver observer is not guaranteed to remain 14387 * valid for the lifetime of this View. If the caller of this method keeps 14388 * a long-lived reference to ViewTreeObserver, it should always check for 14389 * the return value of {@link ViewTreeObserver#isAlive()}. 14390 * 14391 * @return The ViewTreeObserver for this view's hierarchy. 14392 */ 14393 public ViewTreeObserver getViewTreeObserver() { 14394 if (mAttachInfo != null) { 14395 return mAttachInfo.mTreeObserver; 14396 } 14397 if (mFloatingTreeObserver == null) { 14398 mFloatingTreeObserver = new ViewTreeObserver(); 14399 } 14400 return mFloatingTreeObserver; 14401 } 14402 14403 /** 14404 * <p>Finds the topmost view in the current view hierarchy.</p> 14405 * 14406 * @return the topmost view containing this view 14407 */ 14408 public View getRootView() { 14409 if (mAttachInfo != null) { 14410 final View v = mAttachInfo.mRootView; 14411 if (v != null) { 14412 return v; 14413 } 14414 } 14415 14416 View parent = this; 14417 14418 while (parent.mParent != null && parent.mParent instanceof View) { 14419 parent = (View) parent.mParent; 14420 } 14421 14422 return parent; 14423 } 14424 14425 /** 14426 * <p>Computes the coordinates of this view on the screen. The argument 14427 * must be an array of two integers. After the method returns, the array 14428 * contains the x and y location in that order.</p> 14429 * 14430 * @param location an array of two integers in which to hold the coordinates 14431 */ 14432 public void getLocationOnScreen(int[] location) { 14433 getLocationInWindow(location); 14434 14435 final AttachInfo info = mAttachInfo; 14436 if (info != null) { 14437 location[0] += info.mWindowLeft; 14438 location[1] += info.mWindowTop; 14439 } 14440 } 14441 14442 /** 14443 * <p>Computes the coordinates of this view in its window. The argument 14444 * must be an array of two integers. After the method returns, the array 14445 * contains the x and y location in that order.</p> 14446 * 14447 * @param location an array of two integers in which to hold the coordinates 14448 */ 14449 public void getLocationInWindow(int[] location) { 14450 if (location == null || location.length < 2) { 14451 throw new IllegalArgumentException("location must be an array of two integers"); 14452 } 14453 14454 if (mAttachInfo == null) { 14455 // When the view is not attached to a window, this method does not make sense 14456 location[0] = location[1] = 0; 14457 return; 14458 } 14459 14460 float[] position = mAttachInfo.mTmpTransformLocation; 14461 position[0] = position[1] = 0.0f; 14462 14463 if (!hasIdentityMatrix()) { 14464 getMatrix().mapPoints(position); 14465 } 14466 14467 position[0] += mLeft; 14468 position[1] += mTop; 14469 14470 ViewParent viewParent = mParent; 14471 while (viewParent instanceof View) { 14472 final View view = (View) viewParent; 14473 14474 position[0] -= view.mScrollX; 14475 position[1] -= view.mScrollY; 14476 14477 if (!view.hasIdentityMatrix()) { 14478 view.getMatrix().mapPoints(position); 14479 } 14480 14481 position[0] += view.mLeft; 14482 position[1] += view.mTop; 14483 14484 viewParent = view.mParent; 14485 } 14486 14487 if (viewParent instanceof ViewRootImpl) { 14488 // *cough* 14489 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14490 position[1] -= vr.mCurScrollY; 14491 } 14492 14493 location[0] = (int) (position[0] + 0.5f); 14494 location[1] = (int) (position[1] + 0.5f); 14495 } 14496 14497 /** 14498 * {@hide} 14499 * @param id the id of the view to be found 14500 * @return the view of the specified id, null if cannot be found 14501 */ 14502 protected View findViewTraversal(int id) { 14503 if (id == mID) { 14504 return this; 14505 } 14506 return null; 14507 } 14508 14509 /** 14510 * {@hide} 14511 * @param tag the tag of the view to be found 14512 * @return the view of specified tag, null if cannot be found 14513 */ 14514 protected View findViewWithTagTraversal(Object tag) { 14515 if (tag != null && tag.equals(mTag)) { 14516 return this; 14517 } 14518 return null; 14519 } 14520 14521 /** 14522 * {@hide} 14523 * @param predicate The predicate to evaluate. 14524 * @param childToSkip If not null, ignores this child during the recursive traversal. 14525 * @return The first view that matches the predicate or null. 14526 */ 14527 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14528 if (predicate.apply(this)) { 14529 return this; 14530 } 14531 return null; 14532 } 14533 14534 /** 14535 * Look for a child view with the given id. If this view has the given 14536 * id, return this view. 14537 * 14538 * @param id The id to search for. 14539 * @return The view that has the given id in the hierarchy or null 14540 */ 14541 public final View findViewById(int id) { 14542 if (id < 0) { 14543 return null; 14544 } 14545 return findViewTraversal(id); 14546 } 14547 14548 /** 14549 * Finds a view by its unuque and stable accessibility id. 14550 * 14551 * @param accessibilityId The searched accessibility id. 14552 * @return The found view. 14553 */ 14554 final View findViewByAccessibilityId(int accessibilityId) { 14555 if (accessibilityId < 0) { 14556 return null; 14557 } 14558 return findViewByAccessibilityIdTraversal(accessibilityId); 14559 } 14560 14561 /** 14562 * Performs the traversal to find a view by its unuque and stable accessibility id. 14563 * 14564 * <strong>Note:</strong>This method does not stop at the root namespace 14565 * boundary since the user can touch the screen at an arbitrary location 14566 * potentially crossing the root namespace bounday which will send an 14567 * accessibility event to accessibility services and they should be able 14568 * to obtain the event source. Also accessibility ids are guaranteed to be 14569 * unique in the window. 14570 * 14571 * @param accessibilityId The accessibility id. 14572 * @return The found view. 14573 */ 14574 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14575 if (getAccessibilityViewId() == accessibilityId) { 14576 return this; 14577 } 14578 return null; 14579 } 14580 14581 /** 14582 * Look for a child view with the given tag. If this view has the given 14583 * tag, return this view. 14584 * 14585 * @param tag The tag to search for, using "tag.equals(getTag())". 14586 * @return The View that has the given tag in the hierarchy or null 14587 */ 14588 public final View findViewWithTag(Object tag) { 14589 if (tag == null) { 14590 return null; 14591 } 14592 return findViewWithTagTraversal(tag); 14593 } 14594 14595 /** 14596 * {@hide} 14597 * Look for a child view that matches the specified predicate. 14598 * If this view matches the predicate, return this view. 14599 * 14600 * @param predicate The predicate to evaluate. 14601 * @return The first view that matches the predicate or null. 14602 */ 14603 public final View findViewByPredicate(Predicate<View> predicate) { 14604 return findViewByPredicateTraversal(predicate, null); 14605 } 14606 14607 /** 14608 * {@hide} 14609 * Look for a child view that matches the specified predicate, 14610 * starting with the specified view and its descendents and then 14611 * recusively searching the ancestors and siblings of that view 14612 * until this view is reached. 14613 * 14614 * This method is useful in cases where the predicate does not match 14615 * a single unique view (perhaps multiple views use the same id) 14616 * and we are trying to find the view that is "closest" in scope to the 14617 * starting view. 14618 * 14619 * @param start The view to start from. 14620 * @param predicate The predicate to evaluate. 14621 * @return The first view that matches the predicate or null. 14622 */ 14623 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14624 View childToSkip = null; 14625 for (;;) { 14626 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14627 if (view != null || start == this) { 14628 return view; 14629 } 14630 14631 ViewParent parent = start.getParent(); 14632 if (parent == null || !(parent instanceof View)) { 14633 return null; 14634 } 14635 14636 childToSkip = start; 14637 start = (View) parent; 14638 } 14639 } 14640 14641 /** 14642 * Sets the identifier for this view. The identifier does not have to be 14643 * unique in this view's hierarchy. The identifier should be a positive 14644 * number. 14645 * 14646 * @see #NO_ID 14647 * @see #getId() 14648 * @see #findViewById(int) 14649 * 14650 * @param id a number used to identify the view 14651 * 14652 * @attr ref android.R.styleable#View_id 14653 */ 14654 public void setId(int id) { 14655 mID = id; 14656 } 14657 14658 /** 14659 * {@hide} 14660 * 14661 * @param isRoot true if the view belongs to the root namespace, false 14662 * otherwise 14663 */ 14664 public void setIsRootNamespace(boolean isRoot) { 14665 if (isRoot) { 14666 mPrivateFlags |= IS_ROOT_NAMESPACE; 14667 } else { 14668 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14669 } 14670 } 14671 14672 /** 14673 * {@hide} 14674 * 14675 * @return true if the view belongs to the root namespace, false otherwise 14676 */ 14677 public boolean isRootNamespace() { 14678 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14679 } 14680 14681 /** 14682 * Returns this view's identifier. 14683 * 14684 * @return a positive integer used to identify the view or {@link #NO_ID} 14685 * if the view has no ID 14686 * 14687 * @see #setId(int) 14688 * @see #findViewById(int) 14689 * @attr ref android.R.styleable#View_id 14690 */ 14691 @ViewDebug.CapturedViewProperty 14692 public int getId() { 14693 return mID; 14694 } 14695 14696 /** 14697 * Returns this view's tag. 14698 * 14699 * @return the Object stored in this view as a tag 14700 * 14701 * @see #setTag(Object) 14702 * @see #getTag(int) 14703 */ 14704 @ViewDebug.ExportedProperty 14705 public Object getTag() { 14706 return mTag; 14707 } 14708 14709 /** 14710 * Sets the tag associated with this view. A tag can be used to mark 14711 * a view in its hierarchy and does not have to be unique within the 14712 * hierarchy. Tags can also be used to store data within a view without 14713 * resorting to another data structure. 14714 * 14715 * @param tag an Object to tag the view with 14716 * 14717 * @see #getTag() 14718 * @see #setTag(int, Object) 14719 */ 14720 public void setTag(final Object tag) { 14721 mTag = tag; 14722 } 14723 14724 /** 14725 * Returns the tag associated with this view and the specified key. 14726 * 14727 * @param key The key identifying the tag 14728 * 14729 * @return the Object stored in this view as a tag 14730 * 14731 * @see #setTag(int, Object) 14732 * @see #getTag() 14733 */ 14734 public Object getTag(int key) { 14735 if (mKeyedTags != null) return mKeyedTags.get(key); 14736 return null; 14737 } 14738 14739 /** 14740 * Sets a tag associated with this view and a key. A tag can be used 14741 * to mark a view in its hierarchy and does not have to be unique within 14742 * the hierarchy. Tags can also be used to store data within a view 14743 * without resorting to another data structure. 14744 * 14745 * The specified key should be an id declared in the resources of the 14746 * application to ensure it is unique (see the <a 14747 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14748 * Keys identified as belonging to 14749 * the Android framework or not associated with any package will cause 14750 * an {@link IllegalArgumentException} to be thrown. 14751 * 14752 * @param key The key identifying the tag 14753 * @param tag An Object to tag the view with 14754 * 14755 * @throws IllegalArgumentException If they specified key is not valid 14756 * 14757 * @see #setTag(Object) 14758 * @see #getTag(int) 14759 */ 14760 public void setTag(int key, final Object tag) { 14761 // If the package id is 0x00 or 0x01, it's either an undefined package 14762 // or a framework id 14763 if ((key >>> 24) < 2) { 14764 throw new IllegalArgumentException("The key must be an application-specific " 14765 + "resource id."); 14766 } 14767 14768 setKeyedTag(key, tag); 14769 } 14770 14771 /** 14772 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14773 * framework id. 14774 * 14775 * @hide 14776 */ 14777 public void setTagInternal(int key, Object tag) { 14778 if ((key >>> 24) != 0x1) { 14779 throw new IllegalArgumentException("The key must be a framework-specific " 14780 + "resource id."); 14781 } 14782 14783 setKeyedTag(key, tag); 14784 } 14785 14786 private void setKeyedTag(int key, Object tag) { 14787 if (mKeyedTags == null) { 14788 mKeyedTags = new SparseArray<Object>(); 14789 } 14790 14791 mKeyedTags.put(key, tag); 14792 } 14793 14794 /** 14795 * Prints information about this view in the log output, with the tag 14796 * {@link #VIEW_LOG_TAG}. 14797 * 14798 * @hide 14799 */ 14800 public void debug() { 14801 debug(0); 14802 } 14803 14804 /** 14805 * Prints information about this view in the log output, with the tag 14806 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14807 * indentation defined by the <code>depth</code>. 14808 * 14809 * @param depth the indentation level 14810 * 14811 * @hide 14812 */ 14813 protected void debug(int depth) { 14814 String output = debugIndent(depth - 1); 14815 14816 output += "+ " + this; 14817 int id = getId(); 14818 if (id != -1) { 14819 output += " (id=" + id + ")"; 14820 } 14821 Object tag = getTag(); 14822 if (tag != null) { 14823 output += " (tag=" + tag + ")"; 14824 } 14825 Log.d(VIEW_LOG_TAG, output); 14826 14827 if ((mPrivateFlags & FOCUSED) != 0) { 14828 output = debugIndent(depth) + " FOCUSED"; 14829 Log.d(VIEW_LOG_TAG, output); 14830 } 14831 14832 output = debugIndent(depth); 14833 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14834 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14835 + "} "; 14836 Log.d(VIEW_LOG_TAG, output); 14837 14838 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14839 || mPaddingBottom != 0) { 14840 output = debugIndent(depth); 14841 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14842 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14843 Log.d(VIEW_LOG_TAG, output); 14844 } 14845 14846 output = debugIndent(depth); 14847 output += "mMeasureWidth=" + mMeasuredWidth + 14848 " mMeasureHeight=" + mMeasuredHeight; 14849 Log.d(VIEW_LOG_TAG, output); 14850 14851 output = debugIndent(depth); 14852 if (mLayoutParams == null) { 14853 output += "BAD! no layout params"; 14854 } else { 14855 output = mLayoutParams.debug(output); 14856 } 14857 Log.d(VIEW_LOG_TAG, output); 14858 14859 output = debugIndent(depth); 14860 output += "flags={"; 14861 output += View.printFlags(mViewFlags); 14862 output += "}"; 14863 Log.d(VIEW_LOG_TAG, output); 14864 14865 output = debugIndent(depth); 14866 output += "privateFlags={"; 14867 output += View.printPrivateFlags(mPrivateFlags); 14868 output += "}"; 14869 Log.d(VIEW_LOG_TAG, output); 14870 } 14871 14872 /** 14873 * Creates a string of whitespaces used for indentation. 14874 * 14875 * @param depth the indentation level 14876 * @return a String containing (depth * 2 + 3) * 2 white spaces 14877 * 14878 * @hide 14879 */ 14880 protected static String debugIndent(int depth) { 14881 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14882 for (int i = 0; i < (depth * 2) + 3; i++) { 14883 spaces.append(' ').append(' '); 14884 } 14885 return spaces.toString(); 14886 } 14887 14888 /** 14889 * <p>Return the offset of the widget's text baseline from the widget's top 14890 * boundary. If this widget does not support baseline alignment, this 14891 * method returns -1. </p> 14892 * 14893 * @return the offset of the baseline within the widget's bounds or -1 14894 * if baseline alignment is not supported 14895 */ 14896 @ViewDebug.ExportedProperty(category = "layout") 14897 public int getBaseline() { 14898 return -1; 14899 } 14900 14901 /** 14902 * Call this when something has changed which has invalidated the 14903 * layout of this view. This will schedule a layout pass of the view 14904 * tree. 14905 */ 14906 public void requestLayout() { 14907 mPrivateFlags |= FORCE_LAYOUT; 14908 mPrivateFlags |= INVALIDATED; 14909 14910 if (mLayoutParams != null) { 14911 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14912 } 14913 14914 if (mParent != null && !mParent.isLayoutRequested()) { 14915 mParent.requestLayout(); 14916 } 14917 } 14918 14919 /** 14920 * Forces this view to be laid out during the next layout pass. 14921 * This method does not call requestLayout() or forceLayout() 14922 * on the parent. 14923 */ 14924 public void forceLayout() { 14925 mPrivateFlags |= FORCE_LAYOUT; 14926 mPrivateFlags |= INVALIDATED; 14927 } 14928 14929 /** 14930 * <p> 14931 * This is called to find out how big a view should be. The parent 14932 * supplies constraint information in the width and height parameters. 14933 * </p> 14934 * 14935 * <p> 14936 * The actual measurement work of a view is performed in 14937 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14938 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14939 * </p> 14940 * 14941 * 14942 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14943 * parent 14944 * @param heightMeasureSpec Vertical space requirements as imposed by the 14945 * parent 14946 * 14947 * @see #onMeasure(int, int) 14948 */ 14949 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14950 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14951 widthMeasureSpec != mOldWidthMeasureSpec || 14952 heightMeasureSpec != mOldHeightMeasureSpec) { 14953 14954 // first clears the measured dimension flag 14955 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14956 14957 // measure ourselves, this should set the measured dimension flag back 14958 onMeasure(widthMeasureSpec, heightMeasureSpec); 14959 14960 // flag not set, setMeasuredDimension() was not invoked, we raise 14961 // an exception to warn the developer 14962 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14963 throw new IllegalStateException("onMeasure() did not set the" 14964 + " measured dimension by calling" 14965 + " setMeasuredDimension()"); 14966 } 14967 14968 mPrivateFlags |= LAYOUT_REQUIRED; 14969 } 14970 14971 mOldWidthMeasureSpec = widthMeasureSpec; 14972 mOldHeightMeasureSpec = heightMeasureSpec; 14973 } 14974 14975 /** 14976 * <p> 14977 * Measure the view and its content to determine the measured width and the 14978 * measured height. This method is invoked by {@link #measure(int, int)} and 14979 * should be overriden by subclasses to provide accurate and efficient 14980 * measurement of their contents. 14981 * </p> 14982 * 14983 * <p> 14984 * <strong>CONTRACT:</strong> When overriding this method, you 14985 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14986 * measured width and height of this view. Failure to do so will trigger an 14987 * <code>IllegalStateException</code>, thrown by 14988 * {@link #measure(int, int)}. Calling the superclass' 14989 * {@link #onMeasure(int, int)} is a valid use. 14990 * </p> 14991 * 14992 * <p> 14993 * The base class implementation of measure defaults to the background size, 14994 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14995 * override {@link #onMeasure(int, int)} to provide better measurements of 14996 * their content. 14997 * </p> 14998 * 14999 * <p> 15000 * If this method is overridden, it is the subclass's responsibility to make 15001 * sure the measured height and width are at least the view's minimum height 15002 * and width ({@link #getSuggestedMinimumHeight()} and 15003 * {@link #getSuggestedMinimumWidth()}). 15004 * </p> 15005 * 15006 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15007 * The requirements are encoded with 15008 * {@link android.view.View.MeasureSpec}. 15009 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15010 * The requirements are encoded with 15011 * {@link android.view.View.MeasureSpec}. 15012 * 15013 * @see #getMeasuredWidth() 15014 * @see #getMeasuredHeight() 15015 * @see #setMeasuredDimension(int, int) 15016 * @see #getSuggestedMinimumHeight() 15017 * @see #getSuggestedMinimumWidth() 15018 * @see android.view.View.MeasureSpec#getMode(int) 15019 * @see android.view.View.MeasureSpec#getSize(int) 15020 */ 15021 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15022 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15023 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15024 } 15025 15026 /** 15027 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15028 * measured width and measured height. Failing to do so will trigger an 15029 * exception at measurement time.</p> 15030 * 15031 * @param measuredWidth The measured width of this view. May be a complex 15032 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15033 * {@link #MEASURED_STATE_TOO_SMALL}. 15034 * @param measuredHeight The measured height of this view. May be a complex 15035 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15036 * {@link #MEASURED_STATE_TOO_SMALL}. 15037 */ 15038 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15039 mMeasuredWidth = measuredWidth; 15040 mMeasuredHeight = measuredHeight; 15041 15042 mPrivateFlags |= MEASURED_DIMENSION_SET; 15043 } 15044 15045 /** 15046 * Merge two states as returned by {@link #getMeasuredState()}. 15047 * @param curState The current state as returned from a view or the result 15048 * of combining multiple views. 15049 * @param newState The new view state to combine. 15050 * @return Returns a new integer reflecting the combination of the two 15051 * states. 15052 */ 15053 public static int combineMeasuredStates(int curState, int newState) { 15054 return curState | newState; 15055 } 15056 15057 /** 15058 * Version of {@link #resolveSizeAndState(int, int, int)} 15059 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15060 */ 15061 public static int resolveSize(int size, int measureSpec) { 15062 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15063 } 15064 15065 /** 15066 * Utility to reconcile a desired size and state, with constraints imposed 15067 * by a MeasureSpec. Will take the desired size, unless a different size 15068 * is imposed by the constraints. The returned value is a compound integer, 15069 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15070 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15071 * size is smaller than the size the view wants to be. 15072 * 15073 * @param size How big the view wants to be 15074 * @param measureSpec Constraints imposed by the parent 15075 * @return Size information bit mask as defined by 15076 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15077 */ 15078 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15079 int result = size; 15080 int specMode = MeasureSpec.getMode(measureSpec); 15081 int specSize = MeasureSpec.getSize(measureSpec); 15082 switch (specMode) { 15083 case MeasureSpec.UNSPECIFIED: 15084 result = size; 15085 break; 15086 case MeasureSpec.AT_MOST: 15087 if (specSize < size) { 15088 result = specSize | MEASURED_STATE_TOO_SMALL; 15089 } else { 15090 result = size; 15091 } 15092 break; 15093 case MeasureSpec.EXACTLY: 15094 result = specSize; 15095 break; 15096 } 15097 return result | (childMeasuredState&MEASURED_STATE_MASK); 15098 } 15099 15100 /** 15101 * Utility to return a default size. Uses the supplied size if the 15102 * MeasureSpec imposed no constraints. Will get larger if allowed 15103 * by the MeasureSpec. 15104 * 15105 * @param size Default size for this view 15106 * @param measureSpec Constraints imposed by the parent 15107 * @return The size this view should be. 15108 */ 15109 public static int getDefaultSize(int size, int measureSpec) { 15110 int result = size; 15111 int specMode = MeasureSpec.getMode(measureSpec); 15112 int specSize = MeasureSpec.getSize(measureSpec); 15113 15114 switch (specMode) { 15115 case MeasureSpec.UNSPECIFIED: 15116 result = size; 15117 break; 15118 case MeasureSpec.AT_MOST: 15119 case MeasureSpec.EXACTLY: 15120 result = specSize; 15121 break; 15122 } 15123 return result; 15124 } 15125 15126 /** 15127 * Returns the suggested minimum height that the view should use. This 15128 * returns the maximum of the view's minimum height 15129 * and the background's minimum height 15130 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15131 * <p> 15132 * When being used in {@link #onMeasure(int, int)}, the caller should still 15133 * ensure the returned height is within the requirements of the parent. 15134 * 15135 * @return The suggested minimum height of the view. 15136 */ 15137 protected int getSuggestedMinimumHeight() { 15138 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15139 15140 } 15141 15142 /** 15143 * Returns the suggested minimum width that the view should use. This 15144 * returns the maximum of the view's minimum width) 15145 * and the background's minimum width 15146 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15147 * <p> 15148 * When being used in {@link #onMeasure(int, int)}, the caller should still 15149 * ensure the returned width is within the requirements of the parent. 15150 * 15151 * @return The suggested minimum width of the view. 15152 */ 15153 protected int getSuggestedMinimumWidth() { 15154 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15155 } 15156 15157 /** 15158 * Returns the minimum height of the view. 15159 * 15160 * @return the minimum height the view will try to be. 15161 * 15162 * @see #setMinimumHeight(int) 15163 * 15164 * @attr ref android.R.styleable#View_minHeight 15165 */ 15166 public int getMinimumHeight() { 15167 return mMinHeight; 15168 } 15169 15170 /** 15171 * Sets the minimum height of the view. It is not guaranteed the view will 15172 * be able to achieve this minimum height (for example, if its parent layout 15173 * constrains it with less available height). 15174 * 15175 * @param minHeight The minimum height the view will try to be. 15176 * 15177 * @see #getMinimumHeight() 15178 * 15179 * @attr ref android.R.styleable#View_minHeight 15180 */ 15181 public void setMinimumHeight(int minHeight) { 15182 mMinHeight = minHeight; 15183 requestLayout(); 15184 } 15185 15186 /** 15187 * Returns the minimum width of the view. 15188 * 15189 * @return the minimum width the view will try to be. 15190 * 15191 * @see #setMinimumWidth(int) 15192 * 15193 * @attr ref android.R.styleable#View_minWidth 15194 */ 15195 public int getMinimumWidth() { 15196 return mMinWidth; 15197 } 15198 15199 /** 15200 * Sets the minimum width of the view. It is not guaranteed the view will 15201 * be able to achieve this minimum width (for example, if its parent layout 15202 * constrains it with less available width). 15203 * 15204 * @param minWidth The minimum width the view will try to be. 15205 * 15206 * @see #getMinimumWidth() 15207 * 15208 * @attr ref android.R.styleable#View_minWidth 15209 */ 15210 public void setMinimumWidth(int minWidth) { 15211 mMinWidth = minWidth; 15212 requestLayout(); 15213 15214 } 15215 15216 /** 15217 * Get the animation currently associated with this view. 15218 * 15219 * @return The animation that is currently playing or 15220 * scheduled to play for this view. 15221 */ 15222 public Animation getAnimation() { 15223 return mCurrentAnimation; 15224 } 15225 15226 /** 15227 * Start the specified animation now. 15228 * 15229 * @param animation the animation to start now 15230 */ 15231 public void startAnimation(Animation animation) { 15232 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15233 setAnimation(animation); 15234 invalidateParentCaches(); 15235 invalidate(true); 15236 } 15237 15238 /** 15239 * Cancels any animations for this view. 15240 */ 15241 public void clearAnimation() { 15242 if (mCurrentAnimation != null) { 15243 mCurrentAnimation.detach(); 15244 } 15245 mCurrentAnimation = null; 15246 invalidateParentIfNeeded(); 15247 } 15248 15249 /** 15250 * Sets the next animation to play for this view. 15251 * If you want the animation to play immediately, use 15252 * {@link #startAnimation(android.view.animation.Animation)} instead. 15253 * This method provides allows fine-grained 15254 * control over the start time and invalidation, but you 15255 * must make sure that 1) the animation has a start time set, and 15256 * 2) the view's parent (which controls animations on its children) 15257 * will be invalidated when the animation is supposed to 15258 * start. 15259 * 15260 * @param animation The next animation, or null. 15261 */ 15262 public void setAnimation(Animation animation) { 15263 mCurrentAnimation = animation; 15264 15265 if (animation != null) { 15266 // If the screen is off assume the animation start time is now instead of 15267 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15268 // would cause the animation to start when the screen turns back on 15269 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15270 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15271 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15272 } 15273 animation.reset(); 15274 } 15275 } 15276 15277 /** 15278 * Invoked by a parent ViewGroup to notify the start of the animation 15279 * currently associated with this view. If you override this method, 15280 * always call super.onAnimationStart(); 15281 * 15282 * @see #setAnimation(android.view.animation.Animation) 15283 * @see #getAnimation() 15284 */ 15285 protected void onAnimationStart() { 15286 mPrivateFlags |= ANIMATION_STARTED; 15287 } 15288 15289 /** 15290 * Invoked by a parent ViewGroup to notify the end of the animation 15291 * currently associated with this view. If you override this method, 15292 * always call super.onAnimationEnd(); 15293 * 15294 * @see #setAnimation(android.view.animation.Animation) 15295 * @see #getAnimation() 15296 */ 15297 protected void onAnimationEnd() { 15298 mPrivateFlags &= ~ANIMATION_STARTED; 15299 } 15300 15301 /** 15302 * Invoked if there is a Transform that involves alpha. Subclass that can 15303 * draw themselves with the specified alpha should return true, and then 15304 * respect that alpha when their onDraw() is called. If this returns false 15305 * then the view may be redirected to draw into an offscreen buffer to 15306 * fulfill the request, which will look fine, but may be slower than if the 15307 * subclass handles it internally. The default implementation returns false. 15308 * 15309 * @param alpha The alpha (0..255) to apply to the view's drawing 15310 * @return true if the view can draw with the specified alpha. 15311 */ 15312 protected boolean onSetAlpha(int alpha) { 15313 return false; 15314 } 15315 15316 /** 15317 * This is used by the RootView to perform an optimization when 15318 * the view hierarchy contains one or several SurfaceView. 15319 * SurfaceView is always considered transparent, but its children are not, 15320 * therefore all View objects remove themselves from the global transparent 15321 * region (passed as a parameter to this function). 15322 * 15323 * @param region The transparent region for this ViewAncestor (window). 15324 * 15325 * @return Returns true if the effective visibility of the view at this 15326 * point is opaque, regardless of the transparent region; returns false 15327 * if it is possible for underlying windows to be seen behind the view. 15328 * 15329 * {@hide} 15330 */ 15331 public boolean gatherTransparentRegion(Region region) { 15332 final AttachInfo attachInfo = mAttachInfo; 15333 if (region != null && attachInfo != null) { 15334 final int pflags = mPrivateFlags; 15335 if ((pflags & SKIP_DRAW) == 0) { 15336 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15337 // remove it from the transparent region. 15338 final int[] location = attachInfo.mTransparentLocation; 15339 getLocationInWindow(location); 15340 region.op(location[0], location[1], location[0] + mRight - mLeft, 15341 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15342 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15343 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15344 // exists, so we remove the background drawable's non-transparent 15345 // parts from this transparent region. 15346 applyDrawableToTransparentRegion(mBackground, region); 15347 } 15348 } 15349 return true; 15350 } 15351 15352 /** 15353 * Play a sound effect for this view. 15354 * 15355 * <p>The framework will play sound effects for some built in actions, such as 15356 * clicking, but you may wish to play these effects in your widget, 15357 * for instance, for internal navigation. 15358 * 15359 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15360 * {@link #isSoundEffectsEnabled()} is true. 15361 * 15362 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15363 */ 15364 public void playSoundEffect(int soundConstant) { 15365 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15366 return; 15367 } 15368 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15369 } 15370 15371 /** 15372 * BZZZTT!!1! 15373 * 15374 * <p>Provide haptic feedback to the user for this view. 15375 * 15376 * <p>The framework will provide haptic feedback for some built in actions, 15377 * such as long presses, but you may wish to provide feedback for your 15378 * own widget. 15379 * 15380 * <p>The feedback will only be performed if 15381 * {@link #isHapticFeedbackEnabled()} is true. 15382 * 15383 * @param feedbackConstant One of the constants defined in 15384 * {@link HapticFeedbackConstants} 15385 */ 15386 public boolean performHapticFeedback(int feedbackConstant) { 15387 return performHapticFeedback(feedbackConstant, 0); 15388 } 15389 15390 /** 15391 * BZZZTT!!1! 15392 * 15393 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15394 * 15395 * @param feedbackConstant One of the constants defined in 15396 * {@link HapticFeedbackConstants} 15397 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15398 */ 15399 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15400 if (mAttachInfo == null) { 15401 return false; 15402 } 15403 //noinspection SimplifiableIfStatement 15404 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15405 && !isHapticFeedbackEnabled()) { 15406 return false; 15407 } 15408 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15409 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15410 } 15411 15412 /** 15413 * Request that the visibility of the status bar or other screen/window 15414 * decorations be changed. 15415 * 15416 * <p>This method is used to put the over device UI into temporary modes 15417 * where the user's attention is focused more on the application content, 15418 * by dimming or hiding surrounding system affordances. This is typically 15419 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15420 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15421 * to be placed behind the action bar (and with these flags other system 15422 * affordances) so that smooth transitions between hiding and showing them 15423 * can be done. 15424 * 15425 * <p>Two representative examples of the use of system UI visibility is 15426 * implementing a content browsing application (like a magazine reader) 15427 * and a video playing application. 15428 * 15429 * <p>The first code shows a typical implementation of a View in a content 15430 * browsing application. In this implementation, the application goes 15431 * into a content-oriented mode by hiding the status bar and action bar, 15432 * and putting the navigation elements into lights out mode. The user can 15433 * then interact with content while in this mode. Such an application should 15434 * provide an easy way for the user to toggle out of the mode (such as to 15435 * check information in the status bar or access notifications). In the 15436 * implementation here, this is done simply by tapping on the content. 15437 * 15438 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15439 * content} 15440 * 15441 * <p>This second code sample shows a typical implementation of a View 15442 * in a video playing application. In this situation, while the video is 15443 * playing the application would like to go into a complete full-screen mode, 15444 * to use as much of the display as possible for the video. When in this state 15445 * the user can not interact with the application; the system intercepts 15446 * touching on the screen to pop the UI out of full screen mode. See 15447 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15448 * 15449 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15450 * content} 15451 * 15452 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15453 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15454 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15455 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15456 */ 15457 public void setSystemUiVisibility(int visibility) { 15458 if (visibility != mSystemUiVisibility) { 15459 mSystemUiVisibility = visibility; 15460 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15461 mParent.recomputeViewAttributes(this); 15462 } 15463 } 15464 } 15465 15466 /** 15467 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15468 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15469 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15470 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15471 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15472 */ 15473 public int getSystemUiVisibility() { 15474 return mSystemUiVisibility; 15475 } 15476 15477 /** 15478 * Returns the current system UI visibility that is currently set for 15479 * the entire window. This is the combination of the 15480 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15481 * views in the window. 15482 */ 15483 public int getWindowSystemUiVisibility() { 15484 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15485 } 15486 15487 /** 15488 * Override to find out when the window's requested system UI visibility 15489 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15490 * This is different from the callbacks recieved through 15491 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15492 * in that this is only telling you about the local request of the window, 15493 * not the actual values applied by the system. 15494 */ 15495 public void onWindowSystemUiVisibilityChanged(int visible) { 15496 } 15497 15498 /** 15499 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15500 * the view hierarchy. 15501 */ 15502 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15503 onWindowSystemUiVisibilityChanged(visible); 15504 } 15505 15506 /** 15507 * Set a listener to receive callbacks when the visibility of the system bar changes. 15508 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15509 */ 15510 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15511 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15512 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15513 mParent.recomputeViewAttributes(this); 15514 } 15515 } 15516 15517 /** 15518 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15519 * the view hierarchy. 15520 */ 15521 public void dispatchSystemUiVisibilityChanged(int visibility) { 15522 ListenerInfo li = mListenerInfo; 15523 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15524 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15525 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15526 } 15527 } 15528 15529 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15530 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15531 if (val != mSystemUiVisibility) { 15532 setSystemUiVisibility(val); 15533 return true; 15534 } 15535 return false; 15536 } 15537 15538 /** @hide */ 15539 public void setDisabledSystemUiVisibility(int flags) { 15540 if (mAttachInfo != null) { 15541 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15542 mAttachInfo.mDisabledSystemUiVisibility = flags; 15543 if (mParent != null) { 15544 mParent.recomputeViewAttributes(this); 15545 } 15546 } 15547 } 15548 } 15549 15550 /** 15551 * Creates an image that the system displays during the drag and drop 15552 * operation. This is called a "drag shadow". The default implementation 15553 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15554 * appearance as the given View. The default also positions the center of the drag shadow 15555 * directly under the touch point. If no View is provided (the constructor with no parameters 15556 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15557 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15558 * default is an invisible drag shadow. 15559 * <p> 15560 * You are not required to use the View you provide to the constructor as the basis of the 15561 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15562 * anything you want as the drag shadow. 15563 * </p> 15564 * <p> 15565 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15566 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15567 * size and position of the drag shadow. It uses this data to construct a 15568 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15569 * so that your application can draw the shadow image in the Canvas. 15570 * </p> 15571 * 15572 * <div class="special reference"> 15573 * <h3>Developer Guides</h3> 15574 * <p>For a guide to implementing drag and drop features, read the 15575 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15576 * </div> 15577 */ 15578 public static class DragShadowBuilder { 15579 private final WeakReference<View> mView; 15580 15581 /** 15582 * Constructs a shadow image builder based on a View. By default, the resulting drag 15583 * shadow will have the same appearance and dimensions as the View, with the touch point 15584 * over the center of the View. 15585 * @param view A View. Any View in scope can be used. 15586 */ 15587 public DragShadowBuilder(View view) { 15588 mView = new WeakReference<View>(view); 15589 } 15590 15591 /** 15592 * Construct a shadow builder object with no associated View. This 15593 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15594 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15595 * to supply the drag shadow's dimensions and appearance without 15596 * reference to any View object. If they are not overridden, then the result is an 15597 * invisible drag shadow. 15598 */ 15599 public DragShadowBuilder() { 15600 mView = new WeakReference<View>(null); 15601 } 15602 15603 /** 15604 * Returns the View object that had been passed to the 15605 * {@link #View.DragShadowBuilder(View)} 15606 * constructor. If that View parameter was {@code null} or if the 15607 * {@link #View.DragShadowBuilder()} 15608 * constructor was used to instantiate the builder object, this method will return 15609 * null. 15610 * 15611 * @return The View object associate with this builder object. 15612 */ 15613 @SuppressWarnings({"JavadocReference"}) 15614 final public View getView() { 15615 return mView.get(); 15616 } 15617 15618 /** 15619 * Provides the metrics for the shadow image. These include the dimensions of 15620 * the shadow image, and the point within that shadow that should 15621 * be centered under the touch location while dragging. 15622 * <p> 15623 * The default implementation sets the dimensions of the shadow to be the 15624 * same as the dimensions of the View itself and centers the shadow under 15625 * the touch point. 15626 * </p> 15627 * 15628 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15629 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15630 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15631 * image. 15632 * 15633 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15634 * shadow image that should be underneath the touch point during the drag and drop 15635 * operation. Your application must set {@link android.graphics.Point#x} to the 15636 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15637 */ 15638 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15639 final View view = mView.get(); 15640 if (view != null) { 15641 shadowSize.set(view.getWidth(), view.getHeight()); 15642 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15643 } else { 15644 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15645 } 15646 } 15647 15648 /** 15649 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15650 * based on the dimensions it received from the 15651 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15652 * 15653 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15654 */ 15655 public void onDrawShadow(Canvas canvas) { 15656 final View view = mView.get(); 15657 if (view != null) { 15658 view.draw(canvas); 15659 } else { 15660 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15661 } 15662 } 15663 } 15664 15665 /** 15666 * Starts a drag and drop operation. When your application calls this method, it passes a 15667 * {@link android.view.View.DragShadowBuilder} object to the system. The 15668 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15669 * to get metrics for the drag shadow, and then calls the object's 15670 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15671 * <p> 15672 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15673 * drag events to all the View objects in your application that are currently visible. It does 15674 * this either by calling the View object's drag listener (an implementation of 15675 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15676 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15677 * Both are passed a {@link android.view.DragEvent} object that has a 15678 * {@link android.view.DragEvent#getAction()} value of 15679 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15680 * </p> 15681 * <p> 15682 * Your application can invoke startDrag() on any attached View object. The View object does not 15683 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15684 * be related to the View the user selected for dragging. 15685 * </p> 15686 * @param data A {@link android.content.ClipData} object pointing to the data to be 15687 * transferred by the drag and drop operation. 15688 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15689 * drag shadow. 15690 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15691 * drop operation. This Object is put into every DragEvent object sent by the system during the 15692 * current drag. 15693 * <p> 15694 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15695 * to the target Views. For example, it can contain flags that differentiate between a 15696 * a copy operation and a move operation. 15697 * </p> 15698 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15699 * so the parameter should be set to 0. 15700 * @return {@code true} if the method completes successfully, or 15701 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15702 * do a drag, and so no drag operation is in progress. 15703 */ 15704 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15705 Object myLocalState, int flags) { 15706 if (ViewDebug.DEBUG_DRAG) { 15707 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15708 } 15709 boolean okay = false; 15710 15711 Point shadowSize = new Point(); 15712 Point shadowTouchPoint = new Point(); 15713 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15714 15715 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15716 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15717 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15718 } 15719 15720 if (ViewDebug.DEBUG_DRAG) { 15721 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15722 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15723 } 15724 Surface surface = new Surface(); 15725 try { 15726 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15727 flags, shadowSize.x, shadowSize.y, surface); 15728 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15729 + " surface=" + surface); 15730 if (token != null) { 15731 Canvas canvas = surface.lockCanvas(null); 15732 try { 15733 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15734 shadowBuilder.onDrawShadow(canvas); 15735 } finally { 15736 surface.unlockCanvasAndPost(canvas); 15737 } 15738 15739 final ViewRootImpl root = getViewRootImpl(); 15740 15741 // Cache the local state object for delivery with DragEvents 15742 root.setLocalDragState(myLocalState); 15743 15744 // repurpose 'shadowSize' for the last touch point 15745 root.getLastTouchPoint(shadowSize); 15746 15747 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15748 shadowSize.x, shadowSize.y, 15749 shadowTouchPoint.x, shadowTouchPoint.y, data); 15750 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15751 15752 // Off and running! Release our local surface instance; the drag 15753 // shadow surface is now managed by the system process. 15754 surface.release(); 15755 } 15756 } catch (Exception e) { 15757 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15758 surface.destroy(); 15759 } 15760 15761 return okay; 15762 } 15763 15764 /** 15765 * Handles drag events sent by the system following a call to 15766 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15767 *<p> 15768 * When the system calls this method, it passes a 15769 * {@link android.view.DragEvent} object. A call to 15770 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15771 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15772 * operation. 15773 * @param event The {@link android.view.DragEvent} sent by the system. 15774 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15775 * in DragEvent, indicating the type of drag event represented by this object. 15776 * @return {@code true} if the method was successful, otherwise {@code false}. 15777 * <p> 15778 * The method should return {@code true} in response to an action type of 15779 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15780 * operation. 15781 * </p> 15782 * <p> 15783 * The method should also return {@code true} in response to an action type of 15784 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15785 * {@code false} if it didn't. 15786 * </p> 15787 */ 15788 public boolean onDragEvent(DragEvent event) { 15789 return false; 15790 } 15791 15792 /** 15793 * Detects if this View is enabled and has a drag event listener. 15794 * If both are true, then it calls the drag event listener with the 15795 * {@link android.view.DragEvent} it received. If the drag event listener returns 15796 * {@code true}, then dispatchDragEvent() returns {@code true}. 15797 * <p> 15798 * For all other cases, the method calls the 15799 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15800 * method and returns its result. 15801 * </p> 15802 * <p> 15803 * This ensures that a drag event is always consumed, even if the View does not have a drag 15804 * event listener. However, if the View has a listener and the listener returns true, then 15805 * onDragEvent() is not called. 15806 * </p> 15807 */ 15808 public boolean dispatchDragEvent(DragEvent event) { 15809 //noinspection SimplifiableIfStatement 15810 ListenerInfo li = mListenerInfo; 15811 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15812 && li.mOnDragListener.onDrag(this, event)) { 15813 return true; 15814 } 15815 return onDragEvent(event); 15816 } 15817 15818 boolean canAcceptDrag() { 15819 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15820 } 15821 15822 /** 15823 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15824 * it is ever exposed at all. 15825 * @hide 15826 */ 15827 public void onCloseSystemDialogs(String reason) { 15828 } 15829 15830 /** 15831 * Given a Drawable whose bounds have been set to draw into this view, 15832 * update a Region being computed for 15833 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15834 * that any non-transparent parts of the Drawable are removed from the 15835 * given transparent region. 15836 * 15837 * @param dr The Drawable whose transparency is to be applied to the region. 15838 * @param region A Region holding the current transparency information, 15839 * where any parts of the region that are set are considered to be 15840 * transparent. On return, this region will be modified to have the 15841 * transparency information reduced by the corresponding parts of the 15842 * Drawable that are not transparent. 15843 * {@hide} 15844 */ 15845 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15846 if (DBG) { 15847 Log.i("View", "Getting transparent region for: " + this); 15848 } 15849 final Region r = dr.getTransparentRegion(); 15850 final Rect db = dr.getBounds(); 15851 final AttachInfo attachInfo = mAttachInfo; 15852 if (r != null && attachInfo != null) { 15853 final int w = getRight()-getLeft(); 15854 final int h = getBottom()-getTop(); 15855 if (db.left > 0) { 15856 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15857 r.op(0, 0, db.left, h, Region.Op.UNION); 15858 } 15859 if (db.right < w) { 15860 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15861 r.op(db.right, 0, w, h, Region.Op.UNION); 15862 } 15863 if (db.top > 0) { 15864 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15865 r.op(0, 0, w, db.top, Region.Op.UNION); 15866 } 15867 if (db.bottom < h) { 15868 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15869 r.op(0, db.bottom, w, h, Region.Op.UNION); 15870 } 15871 final int[] location = attachInfo.mTransparentLocation; 15872 getLocationInWindow(location); 15873 r.translate(location[0], location[1]); 15874 region.op(r, Region.Op.INTERSECT); 15875 } else { 15876 region.op(db, Region.Op.DIFFERENCE); 15877 } 15878 } 15879 15880 private void checkForLongClick(int delayOffset) { 15881 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15882 mHasPerformedLongPress = false; 15883 15884 if (mPendingCheckForLongPress == null) { 15885 mPendingCheckForLongPress = new CheckForLongPress(); 15886 } 15887 mPendingCheckForLongPress.rememberWindowAttachCount(); 15888 postDelayed(mPendingCheckForLongPress, 15889 ViewConfiguration.getLongPressTimeout() - delayOffset); 15890 } 15891 } 15892 15893 /** 15894 * Inflate a view from an XML resource. This convenience method wraps the {@link 15895 * LayoutInflater} class, which provides a full range of options for view inflation. 15896 * 15897 * @param context The Context object for your activity or application. 15898 * @param resource The resource ID to inflate 15899 * @param root A view group that will be the parent. Used to properly inflate the 15900 * layout_* parameters. 15901 * @see LayoutInflater 15902 */ 15903 public static View inflate(Context context, int resource, ViewGroup root) { 15904 LayoutInflater factory = LayoutInflater.from(context); 15905 return factory.inflate(resource, root); 15906 } 15907 15908 /** 15909 * Scroll the view with standard behavior for scrolling beyond the normal 15910 * content boundaries. Views that call this method should override 15911 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15912 * results of an over-scroll operation. 15913 * 15914 * Views can use this method to handle any touch or fling-based scrolling. 15915 * 15916 * @param deltaX Change in X in pixels 15917 * @param deltaY Change in Y in pixels 15918 * @param scrollX Current X scroll value in pixels before applying deltaX 15919 * @param scrollY Current Y scroll value in pixels before applying deltaY 15920 * @param scrollRangeX Maximum content scroll range along the X axis 15921 * @param scrollRangeY Maximum content scroll range along the Y axis 15922 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15923 * along the X axis. 15924 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15925 * along the Y axis. 15926 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15927 * @return true if scrolling was clamped to an over-scroll boundary along either 15928 * axis, false otherwise. 15929 */ 15930 @SuppressWarnings({"UnusedParameters"}) 15931 protected boolean overScrollBy(int deltaX, int deltaY, 15932 int scrollX, int scrollY, 15933 int scrollRangeX, int scrollRangeY, 15934 int maxOverScrollX, int maxOverScrollY, 15935 boolean isTouchEvent) { 15936 final int overScrollMode = mOverScrollMode; 15937 final boolean canScrollHorizontal = 15938 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15939 final boolean canScrollVertical = 15940 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15941 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15942 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15943 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15944 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15945 15946 int newScrollX = scrollX + deltaX; 15947 if (!overScrollHorizontal) { 15948 maxOverScrollX = 0; 15949 } 15950 15951 int newScrollY = scrollY + deltaY; 15952 if (!overScrollVertical) { 15953 maxOverScrollY = 0; 15954 } 15955 15956 // Clamp values if at the limits and record 15957 final int left = -maxOverScrollX; 15958 final int right = maxOverScrollX + scrollRangeX; 15959 final int top = -maxOverScrollY; 15960 final int bottom = maxOverScrollY + scrollRangeY; 15961 15962 boolean clampedX = false; 15963 if (newScrollX > right) { 15964 newScrollX = right; 15965 clampedX = true; 15966 } else if (newScrollX < left) { 15967 newScrollX = left; 15968 clampedX = true; 15969 } 15970 15971 boolean clampedY = false; 15972 if (newScrollY > bottom) { 15973 newScrollY = bottom; 15974 clampedY = true; 15975 } else if (newScrollY < top) { 15976 newScrollY = top; 15977 clampedY = true; 15978 } 15979 15980 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15981 15982 return clampedX || clampedY; 15983 } 15984 15985 /** 15986 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15987 * respond to the results of an over-scroll operation. 15988 * 15989 * @param scrollX New X scroll value in pixels 15990 * @param scrollY New Y scroll value in pixels 15991 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15992 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15993 */ 15994 protected void onOverScrolled(int scrollX, int scrollY, 15995 boolean clampedX, boolean clampedY) { 15996 // Intentionally empty. 15997 } 15998 15999 /** 16000 * Returns the over-scroll mode for this view. The result will be 16001 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16002 * (allow over-scrolling only if the view content is larger than the container), 16003 * or {@link #OVER_SCROLL_NEVER}. 16004 * 16005 * @return This view's over-scroll mode. 16006 */ 16007 public int getOverScrollMode() { 16008 return mOverScrollMode; 16009 } 16010 16011 /** 16012 * Set the over-scroll mode for this view. Valid over-scroll modes are 16013 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16014 * (allow over-scrolling only if the view content is larger than the container), 16015 * or {@link #OVER_SCROLL_NEVER}. 16016 * 16017 * Setting the over-scroll mode of a view will have an effect only if the 16018 * view is capable of scrolling. 16019 * 16020 * @param overScrollMode The new over-scroll mode for this view. 16021 */ 16022 public void setOverScrollMode(int overScrollMode) { 16023 if (overScrollMode != OVER_SCROLL_ALWAYS && 16024 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16025 overScrollMode != OVER_SCROLL_NEVER) { 16026 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16027 } 16028 mOverScrollMode = overScrollMode; 16029 } 16030 16031 /** 16032 * Gets a scale factor that determines the distance the view should scroll 16033 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16034 * @return The vertical scroll scale factor. 16035 * @hide 16036 */ 16037 protected float getVerticalScrollFactor() { 16038 if (mVerticalScrollFactor == 0) { 16039 TypedValue outValue = new TypedValue(); 16040 if (!mContext.getTheme().resolveAttribute( 16041 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16042 throw new IllegalStateException( 16043 "Expected theme to define listPreferredItemHeight."); 16044 } 16045 mVerticalScrollFactor = outValue.getDimension( 16046 mContext.getResources().getDisplayMetrics()); 16047 } 16048 return mVerticalScrollFactor; 16049 } 16050 16051 /** 16052 * Gets a scale factor that determines the distance the view should scroll 16053 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16054 * @return The horizontal scroll scale factor. 16055 * @hide 16056 */ 16057 protected float getHorizontalScrollFactor() { 16058 // TODO: Should use something else. 16059 return getVerticalScrollFactor(); 16060 } 16061 16062 /** 16063 * Return the value specifying the text direction or policy that was set with 16064 * {@link #setTextDirection(int)}. 16065 * 16066 * @return the defined text direction. It can be one of: 16067 * 16068 * {@link #TEXT_DIRECTION_INHERIT}, 16069 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16070 * {@link #TEXT_DIRECTION_ANY_RTL}, 16071 * {@link #TEXT_DIRECTION_LTR}, 16072 * {@link #TEXT_DIRECTION_RTL}, 16073 * {@link #TEXT_DIRECTION_LOCALE} 16074 */ 16075 @ViewDebug.ExportedProperty(category = "text", mapping = { 16076 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16077 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16078 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16079 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16080 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16081 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16082 }) 16083 public int getTextDirection() { 16084 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16085 } 16086 16087 /** 16088 * Set the text direction. 16089 * 16090 * @param textDirection the direction to set. Should be one of: 16091 * 16092 * {@link #TEXT_DIRECTION_INHERIT}, 16093 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16094 * {@link #TEXT_DIRECTION_ANY_RTL}, 16095 * {@link #TEXT_DIRECTION_LTR}, 16096 * {@link #TEXT_DIRECTION_RTL}, 16097 * {@link #TEXT_DIRECTION_LOCALE} 16098 */ 16099 public void setTextDirection(int textDirection) { 16100 if (getTextDirection() != textDirection) { 16101 // Reset the current text direction and the resolved one 16102 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16103 resetResolvedTextDirection(); 16104 // Set the new text direction 16105 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16106 // Refresh 16107 requestLayout(); 16108 invalidate(true); 16109 } 16110 } 16111 16112 /** 16113 * Return the resolved text direction. 16114 * 16115 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16116 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16117 * up the parent chain of the view. if there is no parent, then it will return the default 16118 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16119 * 16120 * @return the resolved text direction. Returns one of: 16121 * 16122 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16123 * {@link #TEXT_DIRECTION_ANY_RTL}, 16124 * {@link #TEXT_DIRECTION_LTR}, 16125 * {@link #TEXT_DIRECTION_RTL}, 16126 * {@link #TEXT_DIRECTION_LOCALE} 16127 */ 16128 public int getResolvedTextDirection() { 16129 // The text direction will be resolved only if needed 16130 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16131 resolveTextDirection(); 16132 } 16133 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16134 } 16135 16136 /** 16137 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16138 * resolution is done. 16139 */ 16140 public void resolveTextDirection() { 16141 // Reset any previous text direction resolution 16142 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16143 16144 if (hasRtlSupport()) { 16145 // Set resolved text direction flag depending on text direction flag 16146 final int textDirection = getTextDirection(); 16147 switch(textDirection) { 16148 case TEXT_DIRECTION_INHERIT: 16149 if (canResolveTextDirection()) { 16150 ViewGroup viewGroup = ((ViewGroup) mParent); 16151 16152 // Set current resolved direction to the same value as the parent's one 16153 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16154 switch (parentResolvedDirection) { 16155 case TEXT_DIRECTION_FIRST_STRONG: 16156 case TEXT_DIRECTION_ANY_RTL: 16157 case TEXT_DIRECTION_LTR: 16158 case TEXT_DIRECTION_RTL: 16159 case TEXT_DIRECTION_LOCALE: 16160 mPrivateFlags2 |= 16161 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16162 break; 16163 default: 16164 // Default resolved direction is "first strong" heuristic 16165 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16166 } 16167 } else { 16168 // We cannot do the resolution if there is no parent, so use the default one 16169 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16170 } 16171 break; 16172 case TEXT_DIRECTION_FIRST_STRONG: 16173 case TEXT_DIRECTION_ANY_RTL: 16174 case TEXT_DIRECTION_LTR: 16175 case TEXT_DIRECTION_RTL: 16176 case TEXT_DIRECTION_LOCALE: 16177 // Resolved direction is the same as text direction 16178 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16179 break; 16180 default: 16181 // Default resolved direction is "first strong" heuristic 16182 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16183 } 16184 } else { 16185 // Default resolved direction is "first strong" heuristic 16186 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16187 } 16188 16189 // Set to resolved 16190 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16191 onResolvedTextDirectionChanged(); 16192 } 16193 16194 /** 16195 * Called when text direction has been resolved. Subclasses that care about text direction 16196 * resolution should override this method. 16197 * 16198 * The default implementation does nothing. 16199 */ 16200 public void onResolvedTextDirectionChanged() { 16201 } 16202 16203 /** 16204 * Check if text direction resolution can be done. 16205 * 16206 * @return true if text direction resolution can be done otherwise return false. 16207 */ 16208 public boolean canResolveTextDirection() { 16209 switch (getTextDirection()) { 16210 case TEXT_DIRECTION_INHERIT: 16211 return (mParent != null) && (mParent instanceof ViewGroup); 16212 default: 16213 return true; 16214 } 16215 } 16216 16217 /** 16218 * Reset resolved text direction. Text direction can be resolved with a call to 16219 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16220 * reset is done. 16221 */ 16222 public void resetResolvedTextDirection() { 16223 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16224 onResolvedTextDirectionReset(); 16225 } 16226 16227 /** 16228 * Called when text direction is reset. Subclasses that care about text direction reset should 16229 * override this method and do a reset of the text direction of their children. The default 16230 * implementation does nothing. 16231 */ 16232 public void onResolvedTextDirectionReset() { 16233 } 16234 16235 /** 16236 * Return the value specifying the text alignment or policy that was set with 16237 * {@link #setTextAlignment(int)}. 16238 * 16239 * @return the defined text alignment. It can be one of: 16240 * 16241 * {@link #TEXT_ALIGNMENT_INHERIT}, 16242 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16243 * {@link #TEXT_ALIGNMENT_CENTER}, 16244 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16245 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16246 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16247 * {@link #TEXT_ALIGNMENT_VIEW_END} 16248 */ 16249 @ViewDebug.ExportedProperty(category = "text", mapping = { 16250 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16251 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16252 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16253 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16254 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16255 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16256 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16257 }) 16258 public int getTextAlignment() { 16259 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16260 } 16261 16262 /** 16263 * Set the text alignment. 16264 * 16265 * @param textAlignment The text alignment to set. Should be one of 16266 * 16267 * {@link #TEXT_ALIGNMENT_INHERIT}, 16268 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16269 * {@link #TEXT_ALIGNMENT_CENTER}, 16270 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16271 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16272 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16273 * {@link #TEXT_ALIGNMENT_VIEW_END} 16274 * 16275 * @attr ref android.R.styleable#View_textAlignment 16276 */ 16277 public void setTextAlignment(int textAlignment) { 16278 if (textAlignment != getTextAlignment()) { 16279 // Reset the current and resolved text alignment 16280 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16281 resetResolvedTextAlignment(); 16282 // Set the new text alignment 16283 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16284 // Refresh 16285 requestLayout(); 16286 invalidate(true); 16287 } 16288 } 16289 16290 /** 16291 * Return the resolved text alignment. 16292 * 16293 * The resolved text alignment. This needs resolution if the value is 16294 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16295 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16296 * 16297 * @return the resolved text alignment. Returns one of: 16298 * 16299 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16300 * {@link #TEXT_ALIGNMENT_CENTER}, 16301 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16302 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16303 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16304 * {@link #TEXT_ALIGNMENT_VIEW_END} 16305 */ 16306 @ViewDebug.ExportedProperty(category = "text", mapping = { 16307 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16308 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16309 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16310 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16311 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16312 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16313 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16314 }) 16315 public int getResolvedTextAlignment() { 16316 // If text alignment is not resolved, then resolve it 16317 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16318 resolveTextAlignment(); 16319 } 16320 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16321 } 16322 16323 /** 16324 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16325 * resolution is done. 16326 */ 16327 public void resolveTextAlignment() { 16328 // Reset any previous text alignment resolution 16329 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16330 16331 if (hasRtlSupport()) { 16332 // Set resolved text alignment flag depending on text alignment flag 16333 final int textAlignment = getTextAlignment(); 16334 switch (textAlignment) { 16335 case TEXT_ALIGNMENT_INHERIT: 16336 // Check if we can resolve the text alignment 16337 if (canResolveLayoutDirection() && mParent instanceof View) { 16338 View view = (View) mParent; 16339 16340 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16341 switch (parentResolvedTextAlignment) { 16342 case TEXT_ALIGNMENT_GRAVITY: 16343 case TEXT_ALIGNMENT_TEXT_START: 16344 case TEXT_ALIGNMENT_TEXT_END: 16345 case TEXT_ALIGNMENT_CENTER: 16346 case TEXT_ALIGNMENT_VIEW_START: 16347 case TEXT_ALIGNMENT_VIEW_END: 16348 // Resolved text alignment is the same as the parent resolved 16349 // text alignment 16350 mPrivateFlags2 |= 16351 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16352 break; 16353 default: 16354 // Use default resolved text alignment 16355 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16356 } 16357 } 16358 else { 16359 // We cannot do the resolution if there is no parent so use the default 16360 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16361 } 16362 break; 16363 case TEXT_ALIGNMENT_GRAVITY: 16364 case TEXT_ALIGNMENT_TEXT_START: 16365 case TEXT_ALIGNMENT_TEXT_END: 16366 case TEXT_ALIGNMENT_CENTER: 16367 case TEXT_ALIGNMENT_VIEW_START: 16368 case TEXT_ALIGNMENT_VIEW_END: 16369 // Resolved text alignment is the same as text alignment 16370 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16371 break; 16372 default: 16373 // Use default resolved text alignment 16374 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16375 } 16376 } else { 16377 // Use default resolved text alignment 16378 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16379 } 16380 16381 // Set the resolved 16382 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16383 onResolvedTextAlignmentChanged(); 16384 } 16385 16386 /** 16387 * Check if text alignment resolution can be done. 16388 * 16389 * @return true if text alignment resolution can be done otherwise return false. 16390 */ 16391 public boolean canResolveTextAlignment() { 16392 switch (getTextAlignment()) { 16393 case TEXT_DIRECTION_INHERIT: 16394 return (mParent != null); 16395 default: 16396 return true; 16397 } 16398 } 16399 16400 /** 16401 * Called when text alignment has been resolved. Subclasses that care about text alignment 16402 * resolution should override this method. 16403 * 16404 * The default implementation does nothing. 16405 */ 16406 public void onResolvedTextAlignmentChanged() { 16407 } 16408 16409 /** 16410 * Reset resolved text alignment. Text alignment can be resolved with a call to 16411 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16412 * reset is done. 16413 */ 16414 public void resetResolvedTextAlignment() { 16415 // Reset any previous text alignment resolution 16416 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16417 onResolvedTextAlignmentReset(); 16418 } 16419 16420 /** 16421 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16422 * override this method and do a reset of the text alignment of their children. The default 16423 * implementation does nothing. 16424 */ 16425 public void onResolvedTextAlignmentReset() { 16426 } 16427 16428 // 16429 // Properties 16430 // 16431 /** 16432 * A Property wrapper around the <code>alpha</code> functionality handled by the 16433 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16434 */ 16435 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16436 @Override 16437 public void setValue(View object, float value) { 16438 object.setAlpha(value); 16439 } 16440 16441 @Override 16442 public Float get(View object) { 16443 return object.getAlpha(); 16444 } 16445 }; 16446 16447 /** 16448 * A Property wrapper around the <code>translationX</code> functionality handled by the 16449 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16450 */ 16451 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16452 @Override 16453 public void setValue(View object, float value) { 16454 object.setTranslationX(value); 16455 } 16456 16457 @Override 16458 public Float get(View object) { 16459 return object.getTranslationX(); 16460 } 16461 }; 16462 16463 /** 16464 * A Property wrapper around the <code>translationY</code> functionality handled by the 16465 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16466 */ 16467 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16468 @Override 16469 public void setValue(View object, float value) { 16470 object.setTranslationY(value); 16471 } 16472 16473 @Override 16474 public Float get(View object) { 16475 return object.getTranslationY(); 16476 } 16477 }; 16478 16479 /** 16480 * A Property wrapper around the <code>x</code> functionality handled by the 16481 * {@link View#setX(float)} and {@link View#getX()} methods. 16482 */ 16483 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16484 @Override 16485 public void setValue(View object, float value) { 16486 object.setX(value); 16487 } 16488 16489 @Override 16490 public Float get(View object) { 16491 return object.getX(); 16492 } 16493 }; 16494 16495 /** 16496 * A Property wrapper around the <code>y</code> functionality handled by the 16497 * {@link View#setY(float)} and {@link View#getY()} methods. 16498 */ 16499 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16500 @Override 16501 public void setValue(View object, float value) { 16502 object.setY(value); 16503 } 16504 16505 @Override 16506 public Float get(View object) { 16507 return object.getY(); 16508 } 16509 }; 16510 16511 /** 16512 * A Property wrapper around the <code>rotation</code> functionality handled by the 16513 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16514 */ 16515 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16516 @Override 16517 public void setValue(View object, float value) { 16518 object.setRotation(value); 16519 } 16520 16521 @Override 16522 public Float get(View object) { 16523 return object.getRotation(); 16524 } 16525 }; 16526 16527 /** 16528 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16529 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16530 */ 16531 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16532 @Override 16533 public void setValue(View object, float value) { 16534 object.setRotationX(value); 16535 } 16536 16537 @Override 16538 public Float get(View object) { 16539 return object.getRotationX(); 16540 } 16541 }; 16542 16543 /** 16544 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16545 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16546 */ 16547 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16548 @Override 16549 public void setValue(View object, float value) { 16550 object.setRotationY(value); 16551 } 16552 16553 @Override 16554 public Float get(View object) { 16555 return object.getRotationY(); 16556 } 16557 }; 16558 16559 /** 16560 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16561 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16562 */ 16563 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16564 @Override 16565 public void setValue(View object, float value) { 16566 object.setScaleX(value); 16567 } 16568 16569 @Override 16570 public Float get(View object) { 16571 return object.getScaleX(); 16572 } 16573 }; 16574 16575 /** 16576 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16577 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16578 */ 16579 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16580 @Override 16581 public void setValue(View object, float value) { 16582 object.setScaleY(value); 16583 } 16584 16585 @Override 16586 public Float get(View object) { 16587 return object.getScaleY(); 16588 } 16589 }; 16590 16591 /** 16592 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16593 * Each MeasureSpec represents a requirement for either the width or the height. 16594 * A MeasureSpec is comprised of a size and a mode. There are three possible 16595 * modes: 16596 * <dl> 16597 * <dt>UNSPECIFIED</dt> 16598 * <dd> 16599 * The parent has not imposed any constraint on the child. It can be whatever size 16600 * it wants. 16601 * </dd> 16602 * 16603 * <dt>EXACTLY</dt> 16604 * <dd> 16605 * The parent has determined an exact size for the child. The child is going to be 16606 * given those bounds regardless of how big it wants to be. 16607 * </dd> 16608 * 16609 * <dt>AT_MOST</dt> 16610 * <dd> 16611 * The child can be as large as it wants up to the specified size. 16612 * </dd> 16613 * </dl> 16614 * 16615 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16616 * is provided to pack and unpack the <size, mode> tuple into the int. 16617 */ 16618 public static class MeasureSpec { 16619 private static final int MODE_SHIFT = 30; 16620 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16621 16622 /** 16623 * Measure specification mode: The parent has not imposed any constraint 16624 * on the child. It can be whatever size it wants. 16625 */ 16626 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16627 16628 /** 16629 * Measure specification mode: The parent has determined an exact size 16630 * for the child. The child is going to be given those bounds regardless 16631 * of how big it wants to be. 16632 */ 16633 public static final int EXACTLY = 1 << MODE_SHIFT; 16634 16635 /** 16636 * Measure specification mode: The child can be as large as it wants up 16637 * to the specified size. 16638 */ 16639 public static final int AT_MOST = 2 << MODE_SHIFT; 16640 16641 /** 16642 * Creates a measure specification based on the supplied size and mode. 16643 * 16644 * The mode must always be one of the following: 16645 * <ul> 16646 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16647 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16648 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16649 * </ul> 16650 * 16651 * @param size the size of the measure specification 16652 * @param mode the mode of the measure specification 16653 * @return the measure specification based on size and mode 16654 */ 16655 public static int makeMeasureSpec(int size, int mode) { 16656 return size + mode; 16657 } 16658 16659 /** 16660 * Extracts the mode from the supplied measure specification. 16661 * 16662 * @param measureSpec the measure specification to extract the mode from 16663 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16664 * {@link android.view.View.MeasureSpec#AT_MOST} or 16665 * {@link android.view.View.MeasureSpec#EXACTLY} 16666 */ 16667 public static int getMode(int measureSpec) { 16668 return (measureSpec & MODE_MASK); 16669 } 16670 16671 /** 16672 * Extracts the size from the supplied measure specification. 16673 * 16674 * @param measureSpec the measure specification to extract the size from 16675 * @return the size in pixels defined in the supplied measure specification 16676 */ 16677 public static int getSize(int measureSpec) { 16678 return (measureSpec & ~MODE_MASK); 16679 } 16680 16681 /** 16682 * Returns a String representation of the specified measure 16683 * specification. 16684 * 16685 * @param measureSpec the measure specification to convert to a String 16686 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16687 */ 16688 public static String toString(int measureSpec) { 16689 int mode = getMode(measureSpec); 16690 int size = getSize(measureSpec); 16691 16692 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16693 16694 if (mode == UNSPECIFIED) 16695 sb.append("UNSPECIFIED "); 16696 else if (mode == EXACTLY) 16697 sb.append("EXACTLY "); 16698 else if (mode == AT_MOST) 16699 sb.append("AT_MOST "); 16700 else 16701 sb.append(mode).append(" "); 16702 16703 sb.append(size); 16704 return sb.toString(); 16705 } 16706 } 16707 16708 class CheckForLongPress implements Runnable { 16709 16710 private int mOriginalWindowAttachCount; 16711 16712 public void run() { 16713 if (isPressed() && (mParent != null) 16714 && mOriginalWindowAttachCount == mWindowAttachCount) { 16715 if (performLongClick()) { 16716 mHasPerformedLongPress = true; 16717 } 16718 } 16719 } 16720 16721 public void rememberWindowAttachCount() { 16722 mOriginalWindowAttachCount = mWindowAttachCount; 16723 } 16724 } 16725 16726 private final class CheckForTap implements Runnable { 16727 public void run() { 16728 mPrivateFlags &= ~PREPRESSED; 16729 setPressed(true); 16730 checkForLongClick(ViewConfiguration.getTapTimeout()); 16731 } 16732 } 16733 16734 private final class PerformClick implements Runnable { 16735 public void run() { 16736 performClick(); 16737 } 16738 } 16739 16740 /** @hide */ 16741 public void hackTurnOffWindowResizeAnim(boolean off) { 16742 mAttachInfo.mTurnOffWindowResizeAnim = off; 16743 } 16744 16745 /** 16746 * This method returns a ViewPropertyAnimator object, which can be used to animate 16747 * specific properties on this View. 16748 * 16749 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16750 */ 16751 public ViewPropertyAnimator animate() { 16752 if (mAnimator == null) { 16753 mAnimator = new ViewPropertyAnimator(this); 16754 } 16755 return mAnimator; 16756 } 16757 16758 /** 16759 * Interface definition for a callback to be invoked when a hardware key event is 16760 * dispatched to this view. The callback will be invoked before the key event is 16761 * given to the view. This is only useful for hardware keyboards; a software input 16762 * method has no obligation to trigger this listener. 16763 */ 16764 public interface OnKeyListener { 16765 /** 16766 * Called when a hardware key is dispatched to a view. This allows listeners to 16767 * get a chance to respond before the target view. 16768 * <p>Key presses in software keyboards will generally NOT trigger this method, 16769 * although some may elect to do so in some situations. Do not assume a 16770 * software input method has to be key-based; even if it is, it may use key presses 16771 * in a different way than you expect, so there is no way to reliably catch soft 16772 * input key presses. 16773 * 16774 * @param v The view the key has been dispatched to. 16775 * @param keyCode The code for the physical key that was pressed 16776 * @param event The KeyEvent object containing full information about 16777 * the event. 16778 * @return True if the listener has consumed the event, false otherwise. 16779 */ 16780 boolean onKey(View v, int keyCode, KeyEvent event); 16781 } 16782 16783 /** 16784 * Interface definition for a callback to be invoked when a touch event is 16785 * dispatched to this view. The callback will be invoked before the touch 16786 * event is given to the view. 16787 */ 16788 public interface OnTouchListener { 16789 /** 16790 * Called when a touch event is dispatched to a view. This allows listeners to 16791 * get a chance to respond before the target view. 16792 * 16793 * @param v The view the touch event has been dispatched to. 16794 * @param event The MotionEvent object containing full information about 16795 * the event. 16796 * @return True if the listener has consumed the event, false otherwise. 16797 */ 16798 boolean onTouch(View v, MotionEvent event); 16799 } 16800 16801 /** 16802 * Interface definition for a callback to be invoked when a hover event is 16803 * dispatched to this view. The callback will be invoked before the hover 16804 * event is given to the view. 16805 */ 16806 public interface OnHoverListener { 16807 /** 16808 * Called when a hover event is dispatched to a view. This allows listeners to 16809 * get a chance to respond before the target view. 16810 * 16811 * @param v The view the hover event has been dispatched to. 16812 * @param event The MotionEvent object containing full information about 16813 * the event. 16814 * @return True if the listener has consumed the event, false otherwise. 16815 */ 16816 boolean onHover(View v, MotionEvent event); 16817 } 16818 16819 /** 16820 * Interface definition for a callback to be invoked when a generic motion event is 16821 * dispatched to this view. The callback will be invoked before the generic motion 16822 * event is given to the view. 16823 */ 16824 public interface OnGenericMotionListener { 16825 /** 16826 * Called when a generic motion event is dispatched to a view. This allows listeners to 16827 * get a chance to respond before the target view. 16828 * 16829 * @param v The view the generic motion event has been dispatched to. 16830 * @param event The MotionEvent object containing full information about 16831 * the event. 16832 * @return True if the listener has consumed the event, false otherwise. 16833 */ 16834 boolean onGenericMotion(View v, MotionEvent event); 16835 } 16836 16837 /** 16838 * Interface definition for a callback to be invoked when a view has been clicked and held. 16839 */ 16840 public interface OnLongClickListener { 16841 /** 16842 * Called when a view has been clicked and held. 16843 * 16844 * @param v The view that was clicked and held. 16845 * 16846 * @return true if the callback consumed the long click, false otherwise. 16847 */ 16848 boolean onLongClick(View v); 16849 } 16850 16851 /** 16852 * Interface definition for a callback to be invoked when a drag is being dispatched 16853 * to this view. The callback will be invoked before the hosting view's own 16854 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16855 * onDrag(event) behavior, it should return 'false' from this callback. 16856 * 16857 * <div class="special reference"> 16858 * <h3>Developer Guides</h3> 16859 * <p>For a guide to implementing drag and drop features, read the 16860 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16861 * </div> 16862 */ 16863 public interface OnDragListener { 16864 /** 16865 * Called when a drag event is dispatched to a view. This allows listeners 16866 * to get a chance to override base View behavior. 16867 * 16868 * @param v The View that received the drag event. 16869 * @param event The {@link android.view.DragEvent} object for the drag event. 16870 * @return {@code true} if the drag event was handled successfully, or {@code false} 16871 * if the drag event was not handled. Note that {@code false} will trigger the View 16872 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16873 */ 16874 boolean onDrag(View v, DragEvent event); 16875 } 16876 16877 /** 16878 * Interface definition for a callback to be invoked when the focus state of 16879 * a view changed. 16880 */ 16881 public interface OnFocusChangeListener { 16882 /** 16883 * Called when the focus state of a view has changed. 16884 * 16885 * @param v The view whose state has changed. 16886 * @param hasFocus The new focus state of v. 16887 */ 16888 void onFocusChange(View v, boolean hasFocus); 16889 } 16890 16891 /** 16892 * Interface definition for a callback to be invoked when a view is clicked. 16893 */ 16894 public interface OnClickListener { 16895 /** 16896 * Called when a view has been clicked. 16897 * 16898 * @param v The view that was clicked. 16899 */ 16900 void onClick(View v); 16901 } 16902 16903 /** 16904 * Interface definition for a callback to be invoked when the context menu 16905 * for this view is being built. 16906 */ 16907 public interface OnCreateContextMenuListener { 16908 /** 16909 * Called when the context menu for this view is being built. It is not 16910 * safe to hold onto the menu after this method returns. 16911 * 16912 * @param menu The context menu that is being built 16913 * @param v The view for which the context menu is being built 16914 * @param menuInfo Extra information about the item for which the 16915 * context menu should be shown. This information will vary 16916 * depending on the class of v. 16917 */ 16918 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16919 } 16920 16921 /** 16922 * Interface definition for a callback to be invoked when the status bar changes 16923 * visibility. This reports <strong>global</strong> changes to the system UI 16924 * state, not what the application is requesting. 16925 * 16926 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16927 */ 16928 public interface OnSystemUiVisibilityChangeListener { 16929 /** 16930 * Called when the status bar changes visibility because of a call to 16931 * {@link View#setSystemUiVisibility(int)}. 16932 * 16933 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16934 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16935 * This tells you the <strong>global</strong> state of these UI visibility 16936 * flags, not what your app is currently applying. 16937 */ 16938 public void onSystemUiVisibilityChange(int visibility); 16939 } 16940 16941 /** 16942 * Interface definition for a callback to be invoked when this view is attached 16943 * or detached from its window. 16944 */ 16945 public interface OnAttachStateChangeListener { 16946 /** 16947 * Called when the view is attached to a window. 16948 * @param v The view that was attached 16949 */ 16950 public void onViewAttachedToWindow(View v); 16951 /** 16952 * Called when the view is detached from a window. 16953 * @param v The view that was detached 16954 */ 16955 public void onViewDetachedFromWindow(View v); 16956 } 16957 16958 private final class UnsetPressedState implements Runnable { 16959 public void run() { 16960 setPressed(false); 16961 } 16962 } 16963 16964 /** 16965 * Base class for derived classes that want to save and restore their own 16966 * state in {@link android.view.View#onSaveInstanceState()}. 16967 */ 16968 public static class BaseSavedState extends AbsSavedState { 16969 /** 16970 * Constructor used when reading from a parcel. Reads the state of the superclass. 16971 * 16972 * @param source 16973 */ 16974 public BaseSavedState(Parcel source) { 16975 super(source); 16976 } 16977 16978 /** 16979 * Constructor called by derived classes when creating their SavedState objects 16980 * 16981 * @param superState The state of the superclass of this view 16982 */ 16983 public BaseSavedState(Parcelable superState) { 16984 super(superState); 16985 } 16986 16987 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16988 new Parcelable.Creator<BaseSavedState>() { 16989 public BaseSavedState createFromParcel(Parcel in) { 16990 return new BaseSavedState(in); 16991 } 16992 16993 public BaseSavedState[] newArray(int size) { 16994 return new BaseSavedState[size]; 16995 } 16996 }; 16997 } 16998 16999 /** 17000 * A set of information given to a view when it is attached to its parent 17001 * window. 17002 */ 17003 static class AttachInfo { 17004 interface Callbacks { 17005 void playSoundEffect(int effectId); 17006 boolean performHapticFeedback(int effectId, boolean always); 17007 } 17008 17009 /** 17010 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17011 * to a Handler. This class contains the target (View) to invalidate and 17012 * the coordinates of the dirty rectangle. 17013 * 17014 * For performance purposes, this class also implements a pool of up to 17015 * POOL_LIMIT objects that get reused. This reduces memory allocations 17016 * whenever possible. 17017 */ 17018 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17019 private static final int POOL_LIMIT = 10; 17020 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17021 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17022 public InvalidateInfo newInstance() { 17023 return new InvalidateInfo(); 17024 } 17025 17026 public void onAcquired(InvalidateInfo element) { 17027 } 17028 17029 public void onReleased(InvalidateInfo element) { 17030 element.target = null; 17031 } 17032 }, POOL_LIMIT) 17033 ); 17034 17035 private InvalidateInfo mNext; 17036 private boolean mIsPooled; 17037 17038 View target; 17039 17040 int left; 17041 int top; 17042 int right; 17043 int bottom; 17044 17045 public void setNextPoolable(InvalidateInfo element) { 17046 mNext = element; 17047 } 17048 17049 public InvalidateInfo getNextPoolable() { 17050 return mNext; 17051 } 17052 17053 static InvalidateInfo acquire() { 17054 return sPool.acquire(); 17055 } 17056 17057 void release() { 17058 sPool.release(this); 17059 } 17060 17061 public boolean isPooled() { 17062 return mIsPooled; 17063 } 17064 17065 public void setPooled(boolean isPooled) { 17066 mIsPooled = isPooled; 17067 } 17068 } 17069 17070 final IWindowSession mSession; 17071 17072 final IWindow mWindow; 17073 17074 final IBinder mWindowToken; 17075 17076 final Callbacks mRootCallbacks; 17077 17078 HardwareCanvas mHardwareCanvas; 17079 17080 /** 17081 * The top view of the hierarchy. 17082 */ 17083 View mRootView; 17084 17085 IBinder mPanelParentWindowToken; 17086 Surface mSurface; 17087 17088 boolean mHardwareAccelerated; 17089 boolean mHardwareAccelerationRequested; 17090 HardwareRenderer mHardwareRenderer; 17091 17092 boolean mScreenOn; 17093 17094 /** 17095 * Scale factor used by the compatibility mode 17096 */ 17097 float mApplicationScale; 17098 17099 /** 17100 * Indicates whether the application is in compatibility mode 17101 */ 17102 boolean mScalingRequired; 17103 17104 /** 17105 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17106 */ 17107 boolean mTurnOffWindowResizeAnim; 17108 17109 /** 17110 * Left position of this view's window 17111 */ 17112 int mWindowLeft; 17113 17114 /** 17115 * Top position of this view's window 17116 */ 17117 int mWindowTop; 17118 17119 /** 17120 * Left actual position of this view's window. 17121 * 17122 * TODO: This is a workaround for 6623031. Remove when fixed. 17123 */ 17124 int mActualWindowLeft; 17125 17126 /** 17127 * Actual top position of this view's window. 17128 * 17129 * TODO: This is a workaround for 6623031. Remove when fixed. 17130 */ 17131 int mActualWindowTop; 17132 17133 /** 17134 * Indicates whether views need to use 32-bit drawing caches 17135 */ 17136 boolean mUse32BitDrawingCache; 17137 17138 /** 17139 * For windows that are full-screen but using insets to layout inside 17140 * of the screen decorations, these are the current insets for the 17141 * content of the window. 17142 */ 17143 final Rect mContentInsets = new Rect(); 17144 17145 /** 17146 * For windows that are full-screen but using insets to layout inside 17147 * of the screen decorations, these are the current insets for the 17148 * actual visible parts of the window. 17149 */ 17150 final Rect mVisibleInsets = new Rect(); 17151 17152 /** 17153 * The internal insets given by this window. This value is 17154 * supplied by the client (through 17155 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17156 * be given to the window manager when changed to be used in laying 17157 * out windows behind it. 17158 */ 17159 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17160 = new ViewTreeObserver.InternalInsetsInfo(); 17161 17162 /** 17163 * All views in the window's hierarchy that serve as scroll containers, 17164 * used to determine if the window can be resized or must be panned 17165 * to adjust for a soft input area. 17166 */ 17167 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17168 17169 final KeyEvent.DispatcherState mKeyDispatchState 17170 = new KeyEvent.DispatcherState(); 17171 17172 /** 17173 * Indicates whether the view's window currently has the focus. 17174 */ 17175 boolean mHasWindowFocus; 17176 17177 /** 17178 * The current visibility of the window. 17179 */ 17180 int mWindowVisibility; 17181 17182 /** 17183 * Indicates the time at which drawing started to occur. 17184 */ 17185 long mDrawingTime; 17186 17187 /** 17188 * Indicates whether or not ignoring the DIRTY_MASK flags. 17189 */ 17190 boolean mIgnoreDirtyState; 17191 17192 /** 17193 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17194 * to avoid clearing that flag prematurely. 17195 */ 17196 boolean mSetIgnoreDirtyState = false; 17197 17198 /** 17199 * Indicates whether the view's window is currently in touch mode. 17200 */ 17201 boolean mInTouchMode; 17202 17203 /** 17204 * Indicates that ViewAncestor should trigger a global layout change 17205 * the next time it performs a traversal 17206 */ 17207 boolean mRecomputeGlobalAttributes; 17208 17209 /** 17210 * Always report new attributes at next traversal. 17211 */ 17212 boolean mForceReportNewAttributes; 17213 17214 /** 17215 * Set during a traveral if any views want to keep the screen on. 17216 */ 17217 boolean mKeepScreenOn; 17218 17219 /** 17220 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17221 */ 17222 int mSystemUiVisibility; 17223 17224 /** 17225 * Hack to force certain system UI visibility flags to be cleared. 17226 */ 17227 int mDisabledSystemUiVisibility; 17228 17229 /** 17230 * Last global system UI visibility reported by the window manager. 17231 */ 17232 int mGlobalSystemUiVisibility; 17233 17234 /** 17235 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17236 * attached. 17237 */ 17238 boolean mHasSystemUiListeners; 17239 17240 /** 17241 * Set if the visibility of any views has changed. 17242 */ 17243 boolean mViewVisibilityChanged; 17244 17245 /** 17246 * Set to true if a view has been scrolled. 17247 */ 17248 boolean mViewScrollChanged; 17249 17250 /** 17251 * Global to the view hierarchy used as a temporary for dealing with 17252 * x/y points in the transparent region computations. 17253 */ 17254 final int[] mTransparentLocation = new int[2]; 17255 17256 /** 17257 * Global to the view hierarchy used as a temporary for dealing with 17258 * x/y points in the ViewGroup.invalidateChild implementation. 17259 */ 17260 final int[] mInvalidateChildLocation = new int[2]; 17261 17262 17263 /** 17264 * Global to the view hierarchy used as a temporary for dealing with 17265 * x/y location when view is transformed. 17266 */ 17267 final float[] mTmpTransformLocation = new float[2]; 17268 17269 /** 17270 * The view tree observer used to dispatch global events like 17271 * layout, pre-draw, touch mode change, etc. 17272 */ 17273 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17274 17275 /** 17276 * A Canvas used by the view hierarchy to perform bitmap caching. 17277 */ 17278 Canvas mCanvas; 17279 17280 /** 17281 * The view root impl. 17282 */ 17283 final ViewRootImpl mViewRootImpl; 17284 17285 /** 17286 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17287 * handler can be used to pump events in the UI events queue. 17288 */ 17289 final Handler mHandler; 17290 17291 /** 17292 * Temporary for use in computing invalidate rectangles while 17293 * calling up the hierarchy. 17294 */ 17295 final Rect mTmpInvalRect = new Rect(); 17296 17297 /** 17298 * Temporary for use in computing hit areas with transformed views 17299 */ 17300 final RectF mTmpTransformRect = new RectF(); 17301 17302 /** 17303 * Temporary list for use in collecting focusable descendents of a view. 17304 */ 17305 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17306 17307 /** 17308 * The id of the window for accessibility purposes. 17309 */ 17310 int mAccessibilityWindowId = View.NO_ID; 17311 17312 /** 17313 * Whether to ingore not exposed for accessibility Views when 17314 * reporting the view tree to accessibility services. 17315 */ 17316 boolean mIncludeNotImportantViews; 17317 17318 /** 17319 * The drawable for highlighting accessibility focus. 17320 */ 17321 Drawable mAccessibilityFocusDrawable; 17322 17323 /** 17324 * Show where the margins, bounds and layout bounds are for each view. 17325 */ 17326 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17327 17328 /** 17329 * Point used to compute visible regions. 17330 */ 17331 final Point mPoint = new Point(); 17332 17333 /** 17334 * Creates a new set of attachment information with the specified 17335 * events handler and thread. 17336 * 17337 * @param handler the events handler the view must use 17338 */ 17339 AttachInfo(IWindowSession session, IWindow window, 17340 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17341 mSession = session; 17342 mWindow = window; 17343 mWindowToken = window.asBinder(); 17344 mViewRootImpl = viewRootImpl; 17345 mHandler = handler; 17346 mRootCallbacks = effectPlayer; 17347 } 17348 } 17349 17350 /** 17351 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17352 * is supported. This avoids keeping too many unused fields in most 17353 * instances of View.</p> 17354 */ 17355 private static class ScrollabilityCache implements Runnable { 17356 17357 /** 17358 * Scrollbars are not visible 17359 */ 17360 public static final int OFF = 0; 17361 17362 /** 17363 * Scrollbars are visible 17364 */ 17365 public static final int ON = 1; 17366 17367 /** 17368 * Scrollbars are fading away 17369 */ 17370 public static final int FADING = 2; 17371 17372 public boolean fadeScrollBars; 17373 17374 public int fadingEdgeLength; 17375 public int scrollBarDefaultDelayBeforeFade; 17376 public int scrollBarFadeDuration; 17377 17378 public int scrollBarSize; 17379 public ScrollBarDrawable scrollBar; 17380 public float[] interpolatorValues; 17381 public View host; 17382 17383 public final Paint paint; 17384 public final Matrix matrix; 17385 public Shader shader; 17386 17387 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17388 17389 private static final float[] OPAQUE = { 255 }; 17390 private static final float[] TRANSPARENT = { 0.0f }; 17391 17392 /** 17393 * When fading should start. This time moves into the future every time 17394 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17395 */ 17396 public long fadeStartTime; 17397 17398 17399 /** 17400 * The current state of the scrollbars: ON, OFF, or FADING 17401 */ 17402 public int state = OFF; 17403 17404 private int mLastColor; 17405 17406 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17407 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17408 scrollBarSize = configuration.getScaledScrollBarSize(); 17409 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17410 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17411 17412 paint = new Paint(); 17413 matrix = new Matrix(); 17414 // use use a height of 1, and then wack the matrix each time we 17415 // actually use it. 17416 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17417 17418 paint.setShader(shader); 17419 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17420 this.host = host; 17421 } 17422 17423 public void setFadeColor(int color) { 17424 if (color != 0 && color != mLastColor) { 17425 mLastColor = color; 17426 color |= 0xFF000000; 17427 17428 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17429 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17430 17431 paint.setShader(shader); 17432 // Restore the default transfer mode (src_over) 17433 paint.setXfermode(null); 17434 } 17435 } 17436 17437 public void run() { 17438 long now = AnimationUtils.currentAnimationTimeMillis(); 17439 if (now >= fadeStartTime) { 17440 17441 // the animation fades the scrollbars out by changing 17442 // the opacity (alpha) from fully opaque to fully 17443 // transparent 17444 int nextFrame = (int) now; 17445 int framesCount = 0; 17446 17447 Interpolator interpolator = scrollBarInterpolator; 17448 17449 // Start opaque 17450 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17451 17452 // End transparent 17453 nextFrame += scrollBarFadeDuration; 17454 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17455 17456 state = FADING; 17457 17458 // Kick off the fade animation 17459 host.invalidate(true); 17460 } 17461 } 17462 } 17463 17464 /** 17465 * Resuable callback for sending 17466 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17467 */ 17468 private class SendViewScrolledAccessibilityEvent implements Runnable { 17469 public volatile boolean mIsPending; 17470 17471 public void run() { 17472 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17473 mIsPending = false; 17474 } 17475 } 17476 17477 /** 17478 * <p> 17479 * This class represents a delegate that can be registered in a {@link View} 17480 * to enhance accessibility support via composition rather via inheritance. 17481 * It is specifically targeted to widget developers that extend basic View 17482 * classes i.e. classes in package android.view, that would like their 17483 * applications to be backwards compatible. 17484 * </p> 17485 * <div class="special reference"> 17486 * <h3>Developer Guides</h3> 17487 * <p>For more information about making applications accessible, read the 17488 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17489 * developer guide.</p> 17490 * </div> 17491 * <p> 17492 * A scenario in which a developer would like to use an accessibility delegate 17493 * is overriding a method introduced in a later API version then the minimal API 17494 * version supported by the application. For example, the method 17495 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17496 * in API version 4 when the accessibility APIs were first introduced. If a 17497 * developer would like his application to run on API version 4 devices (assuming 17498 * all other APIs used by the application are version 4 or lower) and take advantage 17499 * of this method, instead of overriding the method which would break the application's 17500 * backwards compatibility, he can override the corresponding method in this 17501 * delegate and register the delegate in the target View if the API version of 17502 * the system is high enough i.e. the API version is same or higher to the API 17503 * version that introduced 17504 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17505 * </p> 17506 * <p> 17507 * Here is an example implementation: 17508 * </p> 17509 * <code><pre><p> 17510 * if (Build.VERSION.SDK_INT >= 14) { 17511 * // If the API version is equal of higher than the version in 17512 * // which onInitializeAccessibilityNodeInfo was introduced we 17513 * // register a delegate with a customized implementation. 17514 * View view = findViewById(R.id.view_id); 17515 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17516 * public void onInitializeAccessibilityNodeInfo(View host, 17517 * AccessibilityNodeInfo info) { 17518 * // Let the default implementation populate the info. 17519 * super.onInitializeAccessibilityNodeInfo(host, info); 17520 * // Set some other information. 17521 * info.setEnabled(host.isEnabled()); 17522 * } 17523 * }); 17524 * } 17525 * </code></pre></p> 17526 * <p> 17527 * This delegate contains methods that correspond to the accessibility methods 17528 * in View. If a delegate has been specified the implementation in View hands 17529 * off handling to the corresponding method in this delegate. The default 17530 * implementation the delegate methods behaves exactly as the corresponding 17531 * method in View for the case of no accessibility delegate been set. Hence, 17532 * to customize the behavior of a View method, clients can override only the 17533 * corresponding delegate method without altering the behavior of the rest 17534 * accessibility related methods of the host view. 17535 * </p> 17536 */ 17537 public static class AccessibilityDelegate { 17538 17539 /** 17540 * Sends an accessibility event of the given type. If accessibility is not 17541 * enabled this method has no effect. 17542 * <p> 17543 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17544 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17545 * been set. 17546 * </p> 17547 * 17548 * @param host The View hosting the delegate. 17549 * @param eventType The type of the event to send. 17550 * 17551 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17552 */ 17553 public void sendAccessibilityEvent(View host, int eventType) { 17554 host.sendAccessibilityEventInternal(eventType); 17555 } 17556 17557 /** 17558 * Performs the specified accessibility action on the view. For 17559 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17560 * <p> 17561 * The default implementation behaves as 17562 * {@link View#performAccessibilityAction(int, Bundle) 17563 * View#performAccessibilityAction(int, Bundle)} for the case of 17564 * no accessibility delegate been set. 17565 * </p> 17566 * 17567 * @param action The action to perform. 17568 * @return Whether the action was performed. 17569 * 17570 * @see View#performAccessibilityAction(int, Bundle) 17571 * View#performAccessibilityAction(int, Bundle) 17572 */ 17573 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17574 return host.performAccessibilityActionInternal(action, args); 17575 } 17576 17577 /** 17578 * Sends an accessibility event. This method behaves exactly as 17579 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17580 * empty {@link AccessibilityEvent} and does not perform a check whether 17581 * accessibility is enabled. 17582 * <p> 17583 * The default implementation behaves as 17584 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17585 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17586 * the case of no accessibility delegate been set. 17587 * </p> 17588 * 17589 * @param host The View hosting the delegate. 17590 * @param event The event to send. 17591 * 17592 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17593 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17594 */ 17595 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17596 host.sendAccessibilityEventUncheckedInternal(event); 17597 } 17598 17599 /** 17600 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17601 * to its children for adding their text content to the event. 17602 * <p> 17603 * The default implementation behaves as 17604 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17605 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17606 * the case of no accessibility delegate been set. 17607 * </p> 17608 * 17609 * @param host The View hosting the delegate. 17610 * @param event The event. 17611 * @return True if the event population was completed. 17612 * 17613 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17614 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17615 */ 17616 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17617 return host.dispatchPopulateAccessibilityEventInternal(event); 17618 } 17619 17620 /** 17621 * Gives a chance to the host View to populate the accessibility event with its 17622 * text content. 17623 * <p> 17624 * The default implementation behaves as 17625 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17626 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17627 * the case of no accessibility delegate been set. 17628 * </p> 17629 * 17630 * @param host The View hosting the delegate. 17631 * @param event The accessibility event which to populate. 17632 * 17633 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17634 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17635 */ 17636 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17637 host.onPopulateAccessibilityEventInternal(event); 17638 } 17639 17640 /** 17641 * Initializes an {@link AccessibilityEvent} with information about the 17642 * the host View which is the event source. 17643 * <p> 17644 * The default implementation behaves as 17645 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17646 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17647 * the case of no accessibility delegate been set. 17648 * </p> 17649 * 17650 * @param host The View hosting the delegate. 17651 * @param event The event to initialize. 17652 * 17653 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17654 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17655 */ 17656 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17657 host.onInitializeAccessibilityEventInternal(event); 17658 } 17659 17660 /** 17661 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17662 * <p> 17663 * The default implementation behaves as 17664 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17665 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17666 * the case of no accessibility delegate been set. 17667 * </p> 17668 * 17669 * @param host The View hosting the delegate. 17670 * @param info The instance to initialize. 17671 * 17672 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17673 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17674 */ 17675 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17676 host.onInitializeAccessibilityNodeInfoInternal(info); 17677 } 17678 17679 /** 17680 * Called when a child of the host View has requested sending an 17681 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17682 * to augment the event. 17683 * <p> 17684 * The default implementation behaves as 17685 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17686 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17687 * the case of no accessibility delegate been set. 17688 * </p> 17689 * 17690 * @param host The View hosting the delegate. 17691 * @param child The child which requests sending the event. 17692 * @param event The event to be sent. 17693 * @return True if the event should be sent 17694 * 17695 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17696 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17697 */ 17698 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17699 AccessibilityEvent event) { 17700 return host.onRequestSendAccessibilityEventInternal(child, event); 17701 } 17702 17703 /** 17704 * Gets the provider for managing a virtual view hierarchy rooted at this View 17705 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17706 * that explore the window content. 17707 * <p> 17708 * The default implementation behaves as 17709 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17710 * the case of no accessibility delegate been set. 17711 * </p> 17712 * 17713 * @return The provider. 17714 * 17715 * @see AccessibilityNodeProvider 17716 */ 17717 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17718 return null; 17719 } 17720 } 17721} 17722