View.java revision 76af556c8d70bad552bf5cc1047f0c018fc5f906
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93 94/** 95 * <p> 96 * This class represents the basic building block for user interface components. A View 97 * occupies a rectangular area on the screen and is responsible for drawing and 98 * event handling. View is the base class for <em>widgets</em>, which are 99 * used to create interactive UI components (buttons, text fields, etc.). The 100 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 101 * are invisible containers that hold other Views (or other ViewGroups) and define 102 * their layout properties. 103 * </p> 104 * 105 * <div class="special reference"> 106 * <h3>Developer Guides</h3> 107 * <p>For information about using this class to develop your application's user interface, 108 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 347 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 348 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 349 * {@link #getPaddingEnd()}. 350 * </p> 351 * 352 * <p> 353 * Even though a view can define a padding, it does not provide any support for 354 * margins. However, view groups provide such a support. Refer to 355 * {@link android.view.ViewGroup} and 356 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 357 * </p> 358 * 359 * <a name="Layout"></a> 360 * <h3>Layout</h3> 361 * <p> 362 * Layout is a two pass process: a measure pass and a layout pass. The measuring 363 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 364 * of the view tree. Each view pushes dimension specifications down the tree 365 * during the recursion. At the end of the measure pass, every view has stored 366 * its measurements. The second pass happens in 367 * {@link #layout(int,int,int,int)} and is also top-down. During 368 * this pass each parent is responsible for positioning all of its children 369 * using the sizes computed in the measure pass. 370 * </p> 371 * 372 * <p> 373 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 374 * {@link #getMeasuredHeight()} values must be set, along with those for all of 375 * that view's descendants. A view's measured width and measured height values 376 * must respect the constraints imposed by the view's parents. This guarantees 377 * that at the end of the measure pass, all parents accept all of their 378 * children's measurements. A parent view may call measure() more than once on 379 * its children. For example, the parent may measure each child once with 380 * unspecified dimensions to find out how big they want to be, then call 381 * measure() on them again with actual numbers if the sum of all the children's 382 * unconstrained sizes is too big or too small. 383 * </p> 384 * 385 * <p> 386 * The measure pass uses two classes to communicate dimensions. The 387 * {@link MeasureSpec} class is used by views to tell their parents how they 388 * want to be measured and positioned. The base LayoutParams class just 389 * describes how big the view wants to be for both width and height. For each 390 * dimension, it can specify one of: 391 * <ul> 392 * <li> an exact number 393 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 394 * (minus padding) 395 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 396 * enclose its content (plus padding). 397 * </ul> 398 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 399 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 400 * an X and Y value. 401 * </p> 402 * 403 * <p> 404 * MeasureSpecs are used to push requirements down the tree from parent to 405 * child. A MeasureSpec can be in one of three modes: 406 * <ul> 407 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 408 * of a child view. For example, a LinearLayout may call measure() on its child 409 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 410 * tall the child view wants to be given a width of 240 pixels. 411 * <li>EXACTLY: This is used by the parent to impose an exact size on the 412 * child. The child must use this size, and guarantee that all of its 413 * descendants will fit within this size. 414 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 415 * child. The child must gurantee that it and all of its descendants will fit 416 * within this size. 417 * </ul> 418 * </p> 419 * 420 * <p> 421 * To intiate a layout, call {@link #requestLayout}. This method is typically 422 * called by a view on itself when it believes that is can no longer fit within 423 * its current bounds. 424 * </p> 425 * 426 * <a name="Drawing"></a> 427 * <h3>Drawing</h3> 428 * <p> 429 * Drawing is handled by walking the tree and rendering each view that 430 * intersects the invalid region. Because the tree is traversed in-order, 431 * this means that parents will draw before (i.e., behind) their children, with 432 * siblings drawn in the order they appear in the tree. 433 * If you set a background drawable for a View, then the View will draw it for you 434 * before calling back to its <code>onDraw()</code> method. 435 * </p> 436 * 437 * <p> 438 * Note that the framework will not draw views that are not in the invalid region. 439 * </p> 440 * 441 * <p> 442 * To force a view to draw, call {@link #invalidate()}. 443 * </p> 444 * 445 * <a name="EventHandlingThreading"></a> 446 * <h3>Event Handling and Threading</h3> 447 * <p> 448 * The basic cycle of a view is as follows: 449 * <ol> 450 * <li>An event comes in and is dispatched to the appropriate view. The view 451 * handles the event and notifies any listeners.</li> 452 * <li>If in the course of processing the event, the view's bounds may need 453 * to be changed, the view will call {@link #requestLayout()}.</li> 454 * <li>Similarly, if in the course of processing the event the view's appearance 455 * may need to be changed, the view will call {@link #invalidate()}.</li> 456 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 457 * the framework will take care of measuring, laying out, and drawing the tree 458 * as appropriate.</li> 459 * </ol> 460 * </p> 461 * 462 * <p><em>Note: The entire view tree is single threaded. You must always be on 463 * the UI thread when calling any method on any view.</em> 464 * If you are doing work on other threads and want to update the state of a view 465 * from that thread, you should use a {@link Handler}. 466 * </p> 467 * 468 * <a name="FocusHandling"></a> 469 * <h3>Focus Handling</h3> 470 * <p> 471 * The framework will handle routine focus movement in response to user input. 472 * This includes changing the focus as views are removed or hidden, or as new 473 * views become available. Views indicate their willingness to take focus 474 * through the {@link #isFocusable} method. To change whether a view can take 475 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 476 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 477 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 478 * </p> 479 * <p> 480 * Focus movement is based on an algorithm which finds the nearest neighbor in a 481 * given direction. In rare cases, the default algorithm may not match the 482 * intended behavior of the developer. In these situations, you can provide 483 * explicit overrides by using these XML attributes in the layout file: 484 * <pre> 485 * nextFocusDown 486 * nextFocusLeft 487 * nextFocusRight 488 * nextFocusUp 489 * </pre> 490 * </p> 491 * 492 * 493 * <p> 494 * To get a particular view to take focus, call {@link #requestFocus()}. 495 * </p> 496 * 497 * <a name="TouchMode"></a> 498 * <h3>Touch Mode</h3> 499 * <p> 500 * When a user is navigating a user interface via directional keys such as a D-pad, it is 501 * necessary to give focus to actionable items such as buttons so the user can see 502 * what will take input. If the device has touch capabilities, however, and the user 503 * begins interacting with the interface by touching it, it is no longer necessary to 504 * always highlight, or give focus to, a particular view. This motivates a mode 505 * for interaction named 'touch mode'. 506 * </p> 507 * <p> 508 * For a touch capable device, once the user touches the screen, the device 509 * will enter touch mode. From this point onward, only views for which 510 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 511 * Other views that are touchable, like buttons, will not take focus when touched; they will 512 * only fire the on click listeners. 513 * </p> 514 * <p> 515 * Any time a user hits a directional key, such as a D-pad direction, the view device will 516 * exit touch mode, and find a view to take focus, so that the user may resume interacting 517 * with the user interface without touching the screen again. 518 * </p> 519 * <p> 520 * The touch mode state is maintained across {@link android.app.Activity}s. Call 521 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 522 * </p> 523 * 524 * <a name="Scrolling"></a> 525 * <h3>Scrolling</h3> 526 * <p> 527 * The framework provides basic support for views that wish to internally 528 * scroll their content. This includes keeping track of the X and Y scroll 529 * offset as well as mechanisms for drawing scrollbars. See 530 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 531 * {@link #awakenScrollBars()} for more details. 532 * </p> 533 * 534 * <a name="Tags"></a> 535 * <h3>Tags</h3> 536 * <p> 537 * Unlike IDs, tags are not used to identify views. Tags are essentially an 538 * extra piece of information that can be associated with a view. They are most 539 * often used as a convenience to store data related to views in the views 540 * themselves rather than by putting them in a separate structure. 541 * </p> 542 * 543 * <a name="Properties"></a> 544 * <h3>Properties</h3> 545 * <p> 546 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 547 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 548 * available both in the {@link Property} form as well as in similarly-named setter/getter 549 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 550 * be used to set persistent state associated with these rendering-related properties on the view. 551 * The properties and methods can also be used in conjunction with 552 * {@link android.animation.Animator Animator}-based animations, described more in the 553 * <a href="#Animation">Animation</a> section. 554 * </p> 555 * 556 * <a name="Animation"></a> 557 * <h3>Animation</h3> 558 * <p> 559 * Starting with Android 3.0, the preferred way of animating views is to use the 560 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 561 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 562 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 563 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 564 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 565 * makes animating these View properties particularly easy and efficient. 566 * </p> 567 * <p> 568 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 569 * You can attach an {@link Animation} object to a view using 570 * {@link #setAnimation(Animation)} or 571 * {@link #startAnimation(Animation)}. The animation can alter the scale, 572 * rotation, translation and alpha of a view over time. If the animation is 573 * attached to a view that has children, the animation will affect the entire 574 * subtree rooted by that node. When an animation is started, the framework will 575 * take care of redrawing the appropriate views until the animation completes. 576 * </p> 577 * 578 * <a name="Security"></a> 579 * <h3>Security</h3> 580 * <p> 581 * Sometimes it is essential that an application be able to verify that an action 582 * is being performed with the full knowledge and consent of the user, such as 583 * granting a permission request, making a purchase or clicking on an advertisement. 584 * Unfortunately, a malicious application could try to spoof the user into 585 * performing these actions, unaware, by concealing the intended purpose of the view. 586 * As a remedy, the framework offers a touch filtering mechanism that can be used to 587 * improve the security of views that provide access to sensitive functionality. 588 * </p><p> 589 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 590 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 591 * will discard touches that are received whenever the view's window is obscured by 592 * another visible window. As a result, the view will not receive touches whenever a 593 * toast, dialog or other window appears above the view's window. 594 * </p><p> 595 * For more fine-grained control over security, consider overriding the 596 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 597 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 598 * </p> 599 * 600 * @attr ref android.R.styleable#View_alpha 601 * @attr ref android.R.styleable#View_background 602 * @attr ref android.R.styleable#View_clickable 603 * @attr ref android.R.styleable#View_contentDescription 604 * @attr ref android.R.styleable#View_drawingCacheQuality 605 * @attr ref android.R.styleable#View_duplicateParentState 606 * @attr ref android.R.styleable#View_id 607 * @attr ref android.R.styleable#View_requiresFadingEdge 608 * @attr ref android.R.styleable#View_fadeScrollbars 609 * @attr ref android.R.styleable#View_fadingEdgeLength 610 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 611 * @attr ref android.R.styleable#View_fitsSystemWindows 612 * @attr ref android.R.styleable#View_isScrollContainer 613 * @attr ref android.R.styleable#View_focusable 614 * @attr ref android.R.styleable#View_focusableInTouchMode 615 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 616 * @attr ref android.R.styleable#View_keepScreenOn 617 * @attr ref android.R.styleable#View_layerType 618 * @attr ref android.R.styleable#View_longClickable 619 * @attr ref android.R.styleable#View_minHeight 620 * @attr ref android.R.styleable#View_minWidth 621 * @attr ref android.R.styleable#View_nextFocusDown 622 * @attr ref android.R.styleable#View_nextFocusLeft 623 * @attr ref android.R.styleable#View_nextFocusRight 624 * @attr ref android.R.styleable#View_nextFocusUp 625 * @attr ref android.R.styleable#View_onClick 626 * @attr ref android.R.styleable#View_padding 627 * @attr ref android.R.styleable#View_paddingBottom 628 * @attr ref android.R.styleable#View_paddingLeft 629 * @attr ref android.R.styleable#View_paddingRight 630 * @attr ref android.R.styleable#View_paddingTop 631 * @attr ref android.R.styleable#View_paddingStart 632 * @attr ref android.R.styleable#View_paddingEnd 633 * @attr ref android.R.styleable#View_saveEnabled 634 * @attr ref android.R.styleable#View_rotation 635 * @attr ref android.R.styleable#View_rotationX 636 * @attr ref android.R.styleable#View_rotationY 637 * @attr ref android.R.styleable#View_scaleX 638 * @attr ref android.R.styleable#View_scaleY 639 * @attr ref android.R.styleable#View_scrollX 640 * @attr ref android.R.styleable#View_scrollY 641 * @attr ref android.R.styleable#View_scrollbarSize 642 * @attr ref android.R.styleable#View_scrollbarStyle 643 * @attr ref android.R.styleable#View_scrollbars 644 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 645 * @attr ref android.R.styleable#View_scrollbarFadeDuration 646 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 647 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 648 * @attr ref android.R.styleable#View_scrollbarThumbVertical 649 * @attr ref android.R.styleable#View_scrollbarTrackVertical 650 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 651 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 652 * @attr ref android.R.styleable#View_soundEffectsEnabled 653 * @attr ref android.R.styleable#View_tag 654 * @attr ref android.R.styleable#View_textAlignment 655 * @attr ref android.R.styleable#View_transformPivotX 656 * @attr ref android.R.styleable#View_transformPivotY 657 * @attr ref android.R.styleable#View_translationX 658 * @attr ref android.R.styleable#View_translationY 659 * @attr ref android.R.styleable#View_visibility 660 * 661 * @see android.view.ViewGroup 662 */ 663public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 664 AccessibilityEventSource { 665 private static final boolean DBG = false; 666 667 /** 668 * The logging tag used by this class with android.util.Log. 669 */ 670 protected static final String VIEW_LOG_TAG = "View"; 671 672 /** 673 * When set to true, apps will draw debugging information about their layouts. 674 * 675 * @hide 676 */ 677 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 678 679 /** 680 * Used to mark a View that has no ID. 681 */ 682 public static final int NO_ID = -1; 683 684 /** 685 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 686 * calling setFlags. 687 */ 688 private static final int NOT_FOCUSABLE = 0x00000000; 689 690 /** 691 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 692 * setFlags. 693 */ 694 private static final int FOCUSABLE = 0x00000001; 695 696 /** 697 * Mask for use with setFlags indicating bits used for focus. 698 */ 699 private static final int FOCUSABLE_MASK = 0x00000001; 700 701 /** 702 * This view will adjust its padding to fit sytem windows (e.g. status bar) 703 */ 704 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 705 706 /** 707 * This view is visible. 708 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 709 * android:visibility}. 710 */ 711 public static final int VISIBLE = 0x00000000; 712 713 /** 714 * This view is invisible, but it still takes up space for layout purposes. 715 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 716 * android:visibility}. 717 */ 718 public static final int INVISIBLE = 0x00000004; 719 720 /** 721 * This view is invisible, and it doesn't take any space for layout 722 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 723 * android:visibility}. 724 */ 725 public static final int GONE = 0x00000008; 726 727 /** 728 * Mask for use with setFlags indicating bits used for visibility. 729 * {@hide} 730 */ 731 static final int VISIBILITY_MASK = 0x0000000C; 732 733 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 734 735 /** 736 * This view is enabled. Interpretation varies by subclass. 737 * Use with ENABLED_MASK when calling setFlags. 738 * {@hide} 739 */ 740 static final int ENABLED = 0x00000000; 741 742 /** 743 * This view is disabled. Interpretation varies by subclass. 744 * Use with ENABLED_MASK when calling setFlags. 745 * {@hide} 746 */ 747 static final int DISABLED = 0x00000020; 748 749 /** 750 * Mask for use with setFlags indicating bits used for indicating whether 751 * this view is enabled 752 * {@hide} 753 */ 754 static final int ENABLED_MASK = 0x00000020; 755 756 /** 757 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 758 * called and further optimizations will be performed. It is okay to have 759 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 760 * {@hide} 761 */ 762 static final int WILL_NOT_DRAW = 0x00000080; 763 764 /** 765 * Mask for use with setFlags indicating bits used for indicating whether 766 * this view is will draw 767 * {@hide} 768 */ 769 static final int DRAW_MASK = 0x00000080; 770 771 /** 772 * <p>This view doesn't show scrollbars.</p> 773 * {@hide} 774 */ 775 static final int SCROLLBARS_NONE = 0x00000000; 776 777 /** 778 * <p>This view shows horizontal scrollbars.</p> 779 * {@hide} 780 */ 781 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 782 783 /** 784 * <p>This view shows vertical scrollbars.</p> 785 * {@hide} 786 */ 787 static final int SCROLLBARS_VERTICAL = 0x00000200; 788 789 /** 790 * <p>Mask for use with setFlags indicating bits used for indicating which 791 * scrollbars are enabled.</p> 792 * {@hide} 793 */ 794 static final int SCROLLBARS_MASK = 0x00000300; 795 796 /** 797 * Indicates that the view should filter touches when its window is obscured. 798 * Refer to the class comments for more information about this security feature. 799 * {@hide} 800 */ 801 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 802 803 /** 804 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 805 * that they are optional and should be skipped if the window has 806 * requested system UI flags that ignore those insets for layout. 807 */ 808 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 809 810 /** 811 * <p>This view doesn't show fading edges.</p> 812 * {@hide} 813 */ 814 static final int FADING_EDGE_NONE = 0x00000000; 815 816 /** 817 * <p>This view shows horizontal fading edges.</p> 818 * {@hide} 819 */ 820 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 821 822 /** 823 * <p>This view shows vertical fading edges.</p> 824 * {@hide} 825 */ 826 static final int FADING_EDGE_VERTICAL = 0x00002000; 827 828 /** 829 * <p>Mask for use with setFlags indicating bits used for indicating which 830 * fading edges are enabled.</p> 831 * {@hide} 832 */ 833 static final int FADING_EDGE_MASK = 0x00003000; 834 835 /** 836 * <p>Indicates this view can be clicked. When clickable, a View reacts 837 * to clicks by notifying the OnClickListener.<p> 838 * {@hide} 839 */ 840 static final int CLICKABLE = 0x00004000; 841 842 /** 843 * <p>Indicates this view is caching its drawing into a bitmap.</p> 844 * {@hide} 845 */ 846 static final int DRAWING_CACHE_ENABLED = 0x00008000; 847 848 /** 849 * <p>Indicates that no icicle should be saved for this view.<p> 850 * {@hide} 851 */ 852 static final int SAVE_DISABLED = 0x000010000; 853 854 /** 855 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 856 * property.</p> 857 * {@hide} 858 */ 859 static final int SAVE_DISABLED_MASK = 0x000010000; 860 861 /** 862 * <p>Indicates that no drawing cache should ever be created for this view.<p> 863 * {@hide} 864 */ 865 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 866 867 /** 868 * <p>Indicates this view can take / keep focus when int touch mode.</p> 869 * {@hide} 870 */ 871 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 872 873 /** 874 * <p>Enables low quality mode for the drawing cache.</p> 875 */ 876 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 877 878 /** 879 * <p>Enables high quality mode for the drawing cache.</p> 880 */ 881 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 882 883 /** 884 * <p>Enables automatic quality mode for the drawing cache.</p> 885 */ 886 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 887 888 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 889 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 890 }; 891 892 /** 893 * <p>Mask for use with setFlags indicating bits used for the cache 894 * quality property.</p> 895 * {@hide} 896 */ 897 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 898 899 /** 900 * <p> 901 * Indicates this view can be long clicked. When long clickable, a View 902 * reacts to long clicks by notifying the OnLongClickListener or showing a 903 * context menu. 904 * </p> 905 * {@hide} 906 */ 907 static final int LONG_CLICKABLE = 0x00200000; 908 909 /** 910 * <p>Indicates that this view gets its drawable states from its direct parent 911 * and ignores its original internal states.</p> 912 * 913 * @hide 914 */ 915 static final int DUPLICATE_PARENT_STATE = 0x00400000; 916 917 /** 918 * The scrollbar style to display the scrollbars inside the content area, 919 * without increasing the padding. The scrollbars will be overlaid with 920 * translucency on the view's content. 921 */ 922 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 923 924 /** 925 * The scrollbar style to display the scrollbars inside the padded area, 926 * increasing the padding of the view. The scrollbars will not overlap the 927 * content area of the view. 928 */ 929 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 930 931 /** 932 * The scrollbar style to display the scrollbars at the edge of the view, 933 * without increasing the padding. The scrollbars will be overlaid with 934 * translucency. 935 */ 936 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 937 938 /** 939 * The scrollbar style to display the scrollbars at the edge of the view, 940 * increasing the padding of the view. The scrollbars will only overlap the 941 * background, if any. 942 */ 943 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 944 945 /** 946 * Mask to check if the scrollbar style is overlay or inset. 947 * {@hide} 948 */ 949 static final int SCROLLBARS_INSET_MASK = 0x01000000; 950 951 /** 952 * Mask to check if the scrollbar style is inside or outside. 953 * {@hide} 954 */ 955 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 956 957 /** 958 * Mask for scrollbar style. 959 * {@hide} 960 */ 961 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 962 963 /** 964 * View flag indicating that the screen should remain on while the 965 * window containing this view is visible to the user. This effectively 966 * takes care of automatically setting the WindowManager's 967 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 968 */ 969 public static final int KEEP_SCREEN_ON = 0x04000000; 970 971 /** 972 * View flag indicating whether this view should have sound effects enabled 973 * for events such as clicking and touching. 974 */ 975 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 976 977 /** 978 * View flag indicating whether this view should have haptic feedback 979 * enabled for events such as long presses. 980 */ 981 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 982 983 /** 984 * <p>Indicates that the view hierarchy should stop saving state when 985 * it reaches this view. If state saving is initiated immediately at 986 * the view, it will be allowed. 987 * {@hide} 988 */ 989 static final int PARENT_SAVE_DISABLED = 0x20000000; 990 991 /** 992 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 993 * {@hide} 994 */ 995 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 996 997 /** 998 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 999 * should add all focusable Views regardless if they are focusable in touch mode. 1000 */ 1001 public static final int FOCUSABLES_ALL = 0x00000000; 1002 1003 /** 1004 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1005 * should add only Views focusable in touch mode. 1006 */ 1007 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add only accessibility focusable Views. 1012 * 1013 * @hide 1014 */ 1015 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1016 1017 /** 1018 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1019 * item. 1020 */ 1021 public static final int FOCUS_BACKWARD = 0x00000001; 1022 1023 /** 1024 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1025 * item. 1026 */ 1027 public static final int FOCUS_FORWARD = 0x00000002; 1028 1029 /** 1030 * Use with {@link #focusSearch(int)}. Move focus to the left. 1031 */ 1032 public static final int FOCUS_LEFT = 0x00000011; 1033 1034 /** 1035 * Use with {@link #focusSearch(int)}. Move focus up. 1036 */ 1037 public static final int FOCUS_UP = 0x00000021; 1038 1039 /** 1040 * Use with {@link #focusSearch(int)}. Move focus to the right. 1041 */ 1042 public static final int FOCUS_RIGHT = 0x00000042; 1043 1044 /** 1045 * Use with {@link #focusSearch(int)}. Move focus down. 1046 */ 1047 public static final int FOCUS_DOWN = 0x00000082; 1048 1049 // Accessibility focus directions. 1050 1051 /** 1052 * The accessibility focus which is the current user position when 1053 * interacting with the accessibility framework. 1054 */ 1055 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1056 1057 /** 1058 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1059 */ 1060 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1061 1062 /** 1063 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1064 */ 1065 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1066 1067 /** 1068 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1069 */ 1070 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1071 1072 /** 1073 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1074 */ 1075 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1076 1077 /** 1078 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1079 */ 1080 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1081 1082 /** 1083 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1084 */ 1085 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1086 1087 /** 1088 * Bits of {@link #getMeasuredWidthAndState()} and 1089 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1090 */ 1091 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1092 1093 /** 1094 * Bits of {@link #getMeasuredWidthAndState()} and 1095 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1096 */ 1097 public static final int MEASURED_STATE_MASK = 0xff000000; 1098 1099 /** 1100 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1101 * for functions that combine both width and height into a single int, 1102 * such as {@link #getMeasuredState()} and the childState argument of 1103 * {@link #resolveSizeAndState(int, int, int)}. 1104 */ 1105 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1106 1107 /** 1108 * Bit of {@link #getMeasuredWidthAndState()} and 1109 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1110 * is smaller that the space the view would like to have. 1111 */ 1112 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1113 1114 /** 1115 * Base View state sets 1116 */ 1117 // Singles 1118 /** 1119 * Indicates the view has no states set. States are used with 1120 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1121 * view depending on its state. 1122 * 1123 * @see android.graphics.drawable.Drawable 1124 * @see #getDrawableState() 1125 */ 1126 protected static final int[] EMPTY_STATE_SET; 1127 /** 1128 * Indicates the view is enabled. States are used with 1129 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1130 * view depending on its state. 1131 * 1132 * @see android.graphics.drawable.Drawable 1133 * @see #getDrawableState() 1134 */ 1135 protected static final int[] ENABLED_STATE_SET; 1136 /** 1137 * Indicates the view is focused. States are used with 1138 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1139 * view depending on its state. 1140 * 1141 * @see android.graphics.drawable.Drawable 1142 * @see #getDrawableState() 1143 */ 1144 protected static final int[] FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is selected. States are used with 1147 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1148 * view depending on its state. 1149 * 1150 * @see android.graphics.drawable.Drawable 1151 * @see #getDrawableState() 1152 */ 1153 protected static final int[] SELECTED_STATE_SET; 1154 /** 1155 * Indicates the view is pressed. States are used with 1156 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1157 * view depending on its state. 1158 * 1159 * @see android.graphics.drawable.Drawable 1160 * @see #getDrawableState() 1161 * @hide 1162 */ 1163 protected static final int[] PRESSED_STATE_SET; 1164 /** 1165 * Indicates the view's window has focus. States are used with 1166 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1167 * view depending on its state. 1168 * 1169 * @see android.graphics.drawable.Drawable 1170 * @see #getDrawableState() 1171 */ 1172 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1173 // Doubles 1174 /** 1175 * Indicates the view is enabled and has the focus. 1176 * 1177 * @see #ENABLED_STATE_SET 1178 * @see #FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1181 /** 1182 * Indicates the view is enabled and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #SELECTED_STATE_SET 1186 */ 1187 protected static final int[] ENABLED_SELECTED_STATE_SET; 1188 /** 1189 * Indicates the view is enabled and that its window has focus. 1190 * 1191 * @see #ENABLED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1195 /** 1196 * Indicates the view is focused and selected. 1197 * 1198 * @see #FOCUSED_STATE_SET 1199 * @see #SELECTED_STATE_SET 1200 */ 1201 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1202 /** 1203 * Indicates the view has the focus and that its window has the focus. 1204 * 1205 * @see #FOCUSED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1209 /** 1210 * Indicates the view is selected and that its window has the focus. 1211 * 1212 * @see #SELECTED_STATE_SET 1213 * @see #WINDOW_FOCUSED_STATE_SET 1214 */ 1215 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1216 // Triples 1217 /** 1218 * Indicates the view is enabled, focused and selected. 1219 * 1220 * @see #ENABLED_STATE_SET 1221 * @see #FOCUSED_STATE_SET 1222 * @see #SELECTED_STATE_SET 1223 */ 1224 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1225 /** 1226 * Indicates the view is enabled, focused and its window has the focus. 1227 * 1228 * @see #ENABLED_STATE_SET 1229 * @see #FOCUSED_STATE_SET 1230 * @see #WINDOW_FOCUSED_STATE_SET 1231 */ 1232 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1233 /** 1234 * Indicates the view is enabled, selected and its window has the focus. 1235 * 1236 * @see #ENABLED_STATE_SET 1237 * @see #SELECTED_STATE_SET 1238 * @see #WINDOW_FOCUSED_STATE_SET 1239 */ 1240 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1241 /** 1242 * Indicates the view is focused, selected and its window has the focus. 1243 * 1244 * @see #FOCUSED_STATE_SET 1245 * @see #SELECTED_STATE_SET 1246 * @see #WINDOW_FOCUSED_STATE_SET 1247 */ 1248 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1249 /** 1250 * Indicates the view is enabled, focused, selected and its window 1251 * has the focus. 1252 * 1253 * @see #ENABLED_STATE_SET 1254 * @see #FOCUSED_STATE_SET 1255 * @see #SELECTED_STATE_SET 1256 * @see #WINDOW_FOCUSED_STATE_SET 1257 */ 1258 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1259 /** 1260 * Indicates the view is pressed and its window has the focus. 1261 * 1262 * @see #PRESSED_STATE_SET 1263 * @see #WINDOW_FOCUSED_STATE_SET 1264 */ 1265 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1266 /** 1267 * Indicates the view is pressed and selected. 1268 * 1269 * @see #PRESSED_STATE_SET 1270 * @see #SELECTED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_SELECTED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, selected and its window has the focus. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #SELECTED_STATE_SET 1278 * @see #WINDOW_FOCUSED_STATE_SET 1279 */ 1280 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1281 /** 1282 * Indicates the view is pressed and focused. 1283 * 1284 * @see #PRESSED_STATE_SET 1285 * @see #FOCUSED_STATE_SET 1286 */ 1287 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1288 /** 1289 * Indicates the view is pressed, focused and its window has the focus. 1290 * 1291 * @see #PRESSED_STATE_SET 1292 * @see #FOCUSED_STATE_SET 1293 * @see #WINDOW_FOCUSED_STATE_SET 1294 */ 1295 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1296 /** 1297 * Indicates the view is pressed, focused and selected. 1298 * 1299 * @see #PRESSED_STATE_SET 1300 * @see #SELECTED_STATE_SET 1301 * @see #FOCUSED_STATE_SET 1302 */ 1303 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1304 /** 1305 * Indicates the view is pressed, focused, selected and its window has the focus. 1306 * 1307 * @see #PRESSED_STATE_SET 1308 * @see #FOCUSED_STATE_SET 1309 * @see #SELECTED_STATE_SET 1310 * @see #WINDOW_FOCUSED_STATE_SET 1311 */ 1312 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1313 /** 1314 * Indicates the view is pressed and enabled. 1315 * 1316 * @see #PRESSED_STATE_SET 1317 * @see #ENABLED_STATE_SET 1318 */ 1319 protected static final int[] PRESSED_ENABLED_STATE_SET; 1320 /** 1321 * Indicates the view is pressed, enabled and its window has the focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 */ 1335 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1336 /** 1337 * Indicates the view is pressed, enabled, selected and its window has the 1338 * focus. 1339 * 1340 * @see #PRESSED_STATE_SET 1341 * @see #ENABLED_STATE_SET 1342 * @see #SELECTED_STATE_SET 1343 * @see #WINDOW_FOCUSED_STATE_SET 1344 */ 1345 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1346 /** 1347 * Indicates the view is pressed, enabled and focused. 1348 * 1349 * @see #PRESSED_STATE_SET 1350 * @see #ENABLED_STATE_SET 1351 * @see #FOCUSED_STATE_SET 1352 */ 1353 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1354 /** 1355 * Indicates the view is pressed, enabled, focused and its window has the 1356 * focus. 1357 * 1358 * @see #PRESSED_STATE_SET 1359 * @see #ENABLED_STATE_SET 1360 * @see #FOCUSED_STATE_SET 1361 * @see #WINDOW_FOCUSED_STATE_SET 1362 */ 1363 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1364 /** 1365 * Indicates the view is pressed, enabled, focused and selected. 1366 * 1367 * @see #PRESSED_STATE_SET 1368 * @see #ENABLED_STATE_SET 1369 * @see #SELECTED_STATE_SET 1370 * @see #FOCUSED_STATE_SET 1371 */ 1372 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1373 /** 1374 * Indicates the view is pressed, enabled, focused, selected and its window 1375 * has the focus. 1376 * 1377 * @see #PRESSED_STATE_SET 1378 * @see #ENABLED_STATE_SET 1379 * @see #SELECTED_STATE_SET 1380 * @see #FOCUSED_STATE_SET 1381 * @see #WINDOW_FOCUSED_STATE_SET 1382 */ 1383 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1384 1385 /** 1386 * The order here is very important to {@link #getDrawableState()} 1387 */ 1388 private static final int[][] VIEW_STATE_SETS; 1389 1390 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1391 static final int VIEW_STATE_SELECTED = 1 << 1; 1392 static final int VIEW_STATE_FOCUSED = 1 << 2; 1393 static final int VIEW_STATE_ENABLED = 1 << 3; 1394 static final int VIEW_STATE_PRESSED = 1 << 4; 1395 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1396 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1397 static final int VIEW_STATE_HOVERED = 1 << 7; 1398 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1399 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1400 1401 static final int[] VIEW_STATE_IDS = new int[] { 1402 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1403 R.attr.state_selected, VIEW_STATE_SELECTED, 1404 R.attr.state_focused, VIEW_STATE_FOCUSED, 1405 R.attr.state_enabled, VIEW_STATE_ENABLED, 1406 R.attr.state_pressed, VIEW_STATE_PRESSED, 1407 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1408 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1409 R.attr.state_hovered, VIEW_STATE_HOVERED, 1410 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1411 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1412 }; 1413 1414 static { 1415 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1416 throw new IllegalStateException( 1417 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1418 } 1419 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1420 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1421 int viewState = R.styleable.ViewDrawableStates[i]; 1422 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1423 if (VIEW_STATE_IDS[j] == viewState) { 1424 orderedIds[i * 2] = viewState; 1425 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1426 } 1427 } 1428 } 1429 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1430 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1431 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1432 int numBits = Integer.bitCount(i); 1433 int[] set = new int[numBits]; 1434 int pos = 0; 1435 for (int j = 0; j < orderedIds.length; j += 2) { 1436 if ((i & orderedIds[j+1]) != 0) { 1437 set[pos++] = orderedIds[j]; 1438 } 1439 } 1440 VIEW_STATE_SETS[i] = set; 1441 } 1442 1443 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1444 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1445 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1446 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1448 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1449 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1451 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1453 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1455 | VIEW_STATE_FOCUSED]; 1456 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1457 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1459 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1461 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1463 | VIEW_STATE_ENABLED]; 1464 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1466 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_ENABLED]; 1469 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1471 | VIEW_STATE_ENABLED]; 1472 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1474 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1475 1476 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1477 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1479 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1481 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1482 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1483 | VIEW_STATE_PRESSED]; 1484 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1485 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1486 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1487 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1488 | VIEW_STATE_PRESSED]; 1489 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1490 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1491 | VIEW_STATE_PRESSED]; 1492 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1493 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1494 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1495 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1496 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1497 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1498 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1499 | VIEW_STATE_PRESSED]; 1500 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1501 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1502 | VIEW_STATE_PRESSED]; 1503 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1504 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1505 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1506 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1507 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1508 | VIEW_STATE_PRESSED]; 1509 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1510 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1511 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1512 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1513 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1514 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1515 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1516 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1517 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1518 | VIEW_STATE_PRESSED]; 1519 } 1520 1521 /** 1522 * Accessibility event types that are dispatched for text population. 1523 */ 1524 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1525 AccessibilityEvent.TYPE_VIEW_CLICKED 1526 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1527 | AccessibilityEvent.TYPE_VIEW_SELECTED 1528 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1529 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1531 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1532 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1533 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1534 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1535 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1536 1537 /** 1538 * Temporary Rect currently for use in setBackground(). This will probably 1539 * be extended in the future to hold our own class with more than just 1540 * a Rect. :) 1541 */ 1542 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1543 1544 /** 1545 * Map used to store views' tags. 1546 */ 1547 private SparseArray<Object> mKeyedTags; 1548 1549 /** 1550 * The next available accessiiblity id. 1551 */ 1552 private static int sNextAccessibilityViewId; 1553 1554 /** 1555 * The animation currently associated with this view. 1556 * @hide 1557 */ 1558 protected Animation mCurrentAnimation = null; 1559 1560 /** 1561 * Width as measured during measure pass. 1562 * {@hide} 1563 */ 1564 @ViewDebug.ExportedProperty(category = "measurement") 1565 int mMeasuredWidth; 1566 1567 /** 1568 * Height as measured during measure pass. 1569 * {@hide} 1570 */ 1571 @ViewDebug.ExportedProperty(category = "measurement") 1572 int mMeasuredHeight; 1573 1574 /** 1575 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1576 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1577 * its display list. This flag, used only when hw accelerated, allows us to clear the 1578 * flag while retaining this information until it's needed (at getDisplayList() time and 1579 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1580 * 1581 * {@hide} 1582 */ 1583 boolean mRecreateDisplayList = false; 1584 1585 /** 1586 * The view's identifier. 1587 * {@hide} 1588 * 1589 * @see #setId(int) 1590 * @see #getId() 1591 */ 1592 @ViewDebug.ExportedProperty(resolveId = true) 1593 int mID = NO_ID; 1594 1595 /** 1596 * The stable ID of this view for accessibility purposes. 1597 */ 1598 int mAccessibilityViewId = NO_ID; 1599 1600 /** 1601 * @hide 1602 */ 1603 private int mAccessibilityCursorPosition = -1; 1604 1605 /** 1606 * The view's tag. 1607 * {@hide} 1608 * 1609 * @see #setTag(Object) 1610 * @see #getTag() 1611 */ 1612 protected Object mTag; 1613 1614 // for mPrivateFlags: 1615 /** {@hide} */ 1616 static final int WANTS_FOCUS = 0x00000001; 1617 /** {@hide} */ 1618 static final int FOCUSED = 0x00000002; 1619 /** {@hide} */ 1620 static final int SELECTED = 0x00000004; 1621 /** {@hide} */ 1622 static final int IS_ROOT_NAMESPACE = 0x00000008; 1623 /** {@hide} */ 1624 static final int HAS_BOUNDS = 0x00000010; 1625 /** {@hide} */ 1626 static final int DRAWN = 0x00000020; 1627 /** 1628 * When this flag is set, this view is running an animation on behalf of its 1629 * children and should therefore not cancel invalidate requests, even if they 1630 * lie outside of this view's bounds. 1631 * 1632 * {@hide} 1633 */ 1634 static final int DRAW_ANIMATION = 0x00000040; 1635 /** {@hide} */ 1636 static final int SKIP_DRAW = 0x00000080; 1637 /** {@hide} */ 1638 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1639 /** {@hide} */ 1640 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1641 /** {@hide} */ 1642 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1643 /** {@hide} */ 1644 static final int MEASURED_DIMENSION_SET = 0x00000800; 1645 /** {@hide} */ 1646 static final int FORCE_LAYOUT = 0x00001000; 1647 /** {@hide} */ 1648 static final int LAYOUT_REQUIRED = 0x00002000; 1649 1650 private static final int PRESSED = 0x00004000; 1651 1652 /** {@hide} */ 1653 static final int DRAWING_CACHE_VALID = 0x00008000; 1654 /** 1655 * Flag used to indicate that this view should be drawn once more (and only once 1656 * more) after its animation has completed. 1657 * {@hide} 1658 */ 1659 static final int ANIMATION_STARTED = 0x00010000; 1660 1661 private static final int SAVE_STATE_CALLED = 0x00020000; 1662 1663 /** 1664 * Indicates that the View returned true when onSetAlpha() was called and that 1665 * the alpha must be restored. 1666 * {@hide} 1667 */ 1668 static final int ALPHA_SET = 0x00040000; 1669 1670 /** 1671 * Set by {@link #setScrollContainer(boolean)}. 1672 */ 1673 static final int SCROLL_CONTAINER = 0x00080000; 1674 1675 /** 1676 * Set by {@link #setScrollContainer(boolean)}. 1677 */ 1678 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1679 1680 /** 1681 * View flag indicating whether this view was invalidated (fully or partially.) 1682 * 1683 * @hide 1684 */ 1685 static final int DIRTY = 0x00200000; 1686 1687 /** 1688 * View flag indicating whether this view was invalidated by an opaque 1689 * invalidate request. 1690 * 1691 * @hide 1692 */ 1693 static final int DIRTY_OPAQUE = 0x00400000; 1694 1695 /** 1696 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1697 * 1698 * @hide 1699 */ 1700 static final int DIRTY_MASK = 0x00600000; 1701 1702 /** 1703 * Indicates whether the background is opaque. 1704 * 1705 * @hide 1706 */ 1707 static final int OPAQUE_BACKGROUND = 0x00800000; 1708 1709 /** 1710 * Indicates whether the scrollbars are opaque. 1711 * 1712 * @hide 1713 */ 1714 static final int OPAQUE_SCROLLBARS = 0x01000000; 1715 1716 /** 1717 * Indicates whether the view is opaque. 1718 * 1719 * @hide 1720 */ 1721 static final int OPAQUE_MASK = 0x01800000; 1722 1723 /** 1724 * Indicates a prepressed state; 1725 * the short time between ACTION_DOWN and recognizing 1726 * a 'real' press. Prepressed is used to recognize quick taps 1727 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1728 * 1729 * @hide 1730 */ 1731 private static final int PREPRESSED = 0x02000000; 1732 1733 /** 1734 * Indicates whether the view is temporarily detached. 1735 * 1736 * @hide 1737 */ 1738 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1739 1740 /** 1741 * Indicates that we should awaken scroll bars once attached 1742 * 1743 * @hide 1744 */ 1745 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1746 1747 /** 1748 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1749 * @hide 1750 */ 1751 private static final int HOVERED = 0x10000000; 1752 1753 /** 1754 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1755 * for transform operations 1756 * 1757 * @hide 1758 */ 1759 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1760 1761 /** {@hide} */ 1762 static final int ACTIVATED = 0x40000000; 1763 1764 /** 1765 * Indicates that this view was specifically invalidated, not just dirtied because some 1766 * child view was invalidated. The flag is used to determine when we need to recreate 1767 * a view's display list (as opposed to just returning a reference to its existing 1768 * display list). 1769 * 1770 * @hide 1771 */ 1772 static final int INVALIDATED = 0x80000000; 1773 1774 /* Masks for mPrivateFlags2 */ 1775 1776 /** 1777 * Indicates that this view has reported that it can accept the current drag's content. 1778 * Cleared when the drag operation concludes. 1779 * @hide 1780 */ 1781 static final int DRAG_CAN_ACCEPT = 0x00000001; 1782 1783 /** 1784 * Indicates that this view is currently directly under the drag location in a 1785 * drag-and-drop operation involving content that it can accept. Cleared when 1786 * the drag exits the view, or when the drag operation concludes. 1787 * @hide 1788 */ 1789 static final int DRAG_HOVERED = 0x00000002; 1790 1791 /** 1792 * Horizontal layout direction of this view is from Left to Right. 1793 * Use with {@link #setLayoutDirection}. 1794 */ 1795 public static final int LAYOUT_DIRECTION_LTR = 0; 1796 1797 /** 1798 * Horizontal layout direction of this view is from Right to Left. 1799 * Use with {@link #setLayoutDirection}. 1800 */ 1801 public static final int LAYOUT_DIRECTION_RTL = 1; 1802 1803 /** 1804 * Horizontal layout direction of this view is inherited from its parent. 1805 * Use with {@link #setLayoutDirection}. 1806 */ 1807 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1808 1809 /** 1810 * Horizontal layout direction of this view is from deduced from the default language 1811 * script for the locale. Use with {@link #setLayoutDirection}. 1812 */ 1813 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /** 1828 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1829 * right-to-left direction. 1830 * @hide 1831 */ 1832 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1833 1834 /** 1835 * Indicates whether the view horizontal layout direction has been resolved. 1836 * @hide 1837 */ 1838 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1842 * @hide 1843 */ 1844 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /* 1847 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1848 * flag value. 1849 * @hide 1850 */ 1851 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1852 LAYOUT_DIRECTION_LTR, 1853 LAYOUT_DIRECTION_RTL, 1854 LAYOUT_DIRECTION_INHERIT, 1855 LAYOUT_DIRECTION_LOCALE 1856 }; 1857 1858 /** 1859 * Default horizontal layout direction. 1860 * @hide 1861 */ 1862 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1863 1864 /** 1865 * Indicates that the view is tracking some sort of transient state 1866 * that the app should not need to be aware of, but that the framework 1867 * should take special care to preserve. 1868 * 1869 * @hide 1870 */ 1871 static final int HAS_TRANSIENT_STATE = 0x00000100; 1872 1873 1874 /** 1875 * Text direction is inherited thru {@link ViewGroup} 1876 */ 1877 public static final int TEXT_DIRECTION_INHERIT = 0; 1878 1879 /** 1880 * Text direction is using "first strong algorithm". The first strong directional character 1881 * determines the paragraph direction. If there is no strong directional character, the 1882 * paragraph direction is the view's resolved layout direction. 1883 */ 1884 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1885 1886 /** 1887 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1888 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1889 * If there are neither, the paragraph direction is the view's resolved layout direction. 1890 */ 1891 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1892 1893 /** 1894 * Text direction is forced to LTR. 1895 */ 1896 public static final int TEXT_DIRECTION_LTR = 3; 1897 1898 /** 1899 * Text direction is forced to RTL. 1900 */ 1901 public static final int TEXT_DIRECTION_RTL = 4; 1902 1903 /** 1904 * Text direction is coming from the system Locale. 1905 */ 1906 public static final int TEXT_DIRECTION_LOCALE = 5; 1907 1908 /** 1909 * Default text direction is inherited 1910 */ 1911 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1912 1913 /** 1914 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1915 * @hide 1916 */ 1917 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1918 1919 /** 1920 * Mask for use with private flags indicating bits used for text direction. 1921 * @hide 1922 */ 1923 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1924 1925 /** 1926 * Array of text direction flags for mapping attribute "textDirection" to correct 1927 * flag value. 1928 * @hide 1929 */ 1930 private static final int[] TEXT_DIRECTION_FLAGS = { 1931 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1932 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1933 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1934 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1935 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1936 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1937 }; 1938 1939 /** 1940 * Indicates whether the view text direction has been resolved. 1941 * @hide 1942 */ 1943 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1944 1945 /** 1946 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1947 * @hide 1948 */ 1949 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1950 1951 /** 1952 * Mask for use with private flags indicating bits used for resolved text direction. 1953 * @hide 1954 */ 1955 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1956 1957 /** 1958 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1959 * @hide 1960 */ 1961 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1962 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /* 1965 * Default text alignment. The text alignment of this View is inherited from its parent. 1966 * Use with {@link #setTextAlignment(int)} 1967 */ 1968 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1969 1970 /** 1971 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1972 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1973 * 1974 * Use with {@link #setTextAlignment(int)} 1975 */ 1976 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1977 1978 /** 1979 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1980 * 1981 * Use with {@link #setTextAlignment(int)} 1982 */ 1983 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1984 1985 /** 1986 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1987 * 1988 * Use with {@link #setTextAlignment(int)} 1989 */ 1990 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1991 1992 /** 1993 * Center the paragraph, e.g. ALIGN_CENTER. 1994 * 1995 * Use with {@link #setTextAlignment(int)} 1996 */ 1997 public static final int TEXT_ALIGNMENT_CENTER = 4; 1998 1999 /** 2000 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2001 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2002 * 2003 * Use with {@link #setTextAlignment(int)} 2004 */ 2005 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2006 2007 /** 2008 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2009 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2010 * 2011 * Use with {@link #setTextAlignment(int)} 2012 */ 2013 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2014 2015 /** 2016 * Default text alignment is inherited 2017 */ 2018 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2019 2020 /** 2021 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2022 * @hide 2023 */ 2024 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2025 2026 /** 2027 * Mask for use with private flags indicating bits used for text alignment. 2028 * @hide 2029 */ 2030 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2031 2032 /** 2033 * Array of text direction flags for mapping attribute "textAlignment" to correct 2034 * flag value. 2035 * @hide 2036 */ 2037 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2038 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2039 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2040 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2041 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2042 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2043 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2044 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2045 }; 2046 2047 /** 2048 * Indicates whether the view text alignment has been resolved. 2049 * @hide 2050 */ 2051 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2052 2053 /** 2054 * Bit shift to get the resolved text alignment. 2055 * @hide 2056 */ 2057 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2058 2059 /** 2060 * Mask for use with private flags indicating bits used for text alignment. 2061 * @hide 2062 */ 2063 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2064 2065 /** 2066 * Indicates whether if the view text alignment has been resolved to gravity 2067 */ 2068 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2069 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2070 2071 // Accessiblity constants for mPrivateFlags2 2072 2073 /** 2074 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2075 */ 2076 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2077 2078 /** 2079 * Automatically determine whether a view is important for accessibility. 2080 */ 2081 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2082 2083 /** 2084 * The view is important for accessibility. 2085 */ 2086 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2087 2088 /** 2089 * The view is not important for accessibility. 2090 */ 2091 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2092 2093 /** 2094 * The default whether the view is important for accessiblity. 2095 */ 2096 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2097 2098 /** 2099 * Mask for obtainig the bits which specify how to determine 2100 * whether a view is important for accessibility. 2101 */ 2102 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2103 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2104 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2105 2106 /** 2107 * Flag indicating whether a view has accessibility focus. 2108 */ 2109 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2110 2111 /** 2112 * Flag indicating whether a view state for accessibility has changed. 2113 */ 2114 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2115 2116 /** 2117 * Flag indicating that view has an animation set on it. This is used to track whether an 2118 * animation is cleared between successive frames, in order to tell the associated 2119 * DisplayList to clear its animation matrix. 2120 */ 2121 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x10000000; 2122 2123 /** 2124 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2125 * is used to check whether later changes to the view's transform should invalidate the 2126 * view to force the quickReject test to run again. 2127 */ 2128 static final int VIEW_QUICK_REJECTED = 0x20000000; 2129 2130 /* End of masks for mPrivateFlags2 */ 2131 2132 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2133 2134 /** 2135 * Always allow a user to over-scroll this view, provided it is a 2136 * view that can scroll. 2137 * 2138 * @see #getOverScrollMode() 2139 * @see #setOverScrollMode(int) 2140 */ 2141 public static final int OVER_SCROLL_ALWAYS = 0; 2142 2143 /** 2144 * Allow a user to over-scroll this view only if the content is large 2145 * enough to meaningfully scroll, provided it is a view that can scroll. 2146 * 2147 * @see #getOverScrollMode() 2148 * @see #setOverScrollMode(int) 2149 */ 2150 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2151 2152 /** 2153 * Never allow a user to over-scroll this view. 2154 * 2155 * @see #getOverScrollMode() 2156 * @see #setOverScrollMode(int) 2157 */ 2158 public static final int OVER_SCROLL_NEVER = 2; 2159 2160 /** 2161 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2162 * requested the system UI (status bar) to be visible (the default). 2163 * 2164 * @see #setSystemUiVisibility(int) 2165 */ 2166 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2167 2168 /** 2169 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2170 * system UI to enter an unobtrusive "low profile" mode. 2171 * 2172 * <p>This is for use in games, book readers, video players, or any other 2173 * "immersive" application where the usual system chrome is deemed too distracting. 2174 * 2175 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2176 * 2177 * @see #setSystemUiVisibility(int) 2178 */ 2179 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2180 2181 /** 2182 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2183 * system navigation be temporarily hidden. 2184 * 2185 * <p>This is an even less obtrusive state than that called for by 2186 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2187 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2188 * those to disappear. This is useful (in conjunction with the 2189 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2190 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2191 * window flags) for displaying content using every last pixel on the display. 2192 * 2193 * <p>There is a limitation: because navigation controls are so important, the least user 2194 * interaction will cause them to reappear immediately. When this happens, both 2195 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2196 * so that both elements reappear at the same time. 2197 * 2198 * @see #setSystemUiVisibility(int) 2199 */ 2200 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2201 2202 /** 2203 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2204 * into the normal fullscreen mode so that its content can take over the screen 2205 * while still allowing the user to interact with the application. 2206 * 2207 * <p>This has the same visual effect as 2208 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2209 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2210 * meaning that non-critical screen decorations (such as the status bar) will be 2211 * hidden while the user is in the View's window, focusing the experience on 2212 * that content. Unlike the window flag, if you are using ActionBar in 2213 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2214 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2215 * hide the action bar. 2216 * 2217 * <p>This approach to going fullscreen is best used over the window flag when 2218 * it is a transient state -- that is, the application does this at certain 2219 * points in its user interaction where it wants to allow the user to focus 2220 * on content, but not as a continuous state. For situations where the application 2221 * would like to simply stay full screen the entire time (such as a game that 2222 * wants to take over the screen), the 2223 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2224 * is usually a better approach. The state set here will be removed by the system 2225 * in various situations (such as the user moving to another application) like 2226 * the other system UI states. 2227 * 2228 * <p>When using this flag, the application should provide some easy facility 2229 * for the user to go out of it. A common example would be in an e-book 2230 * reader, where tapping on the screen brings back whatever screen and UI 2231 * decorations that had been hidden while the user was immersed in reading 2232 * the book. 2233 * 2234 * @see #setSystemUiVisibility(int) 2235 */ 2236 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2237 2238 /** 2239 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2240 * flags, we would like a stable view of the content insets given to 2241 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2242 * will always represent the worst case that the application can expect 2243 * as a continue state. In practice this means with any of system bar, 2244 * nav bar, and status bar shown, but not the space that would be needed 2245 * for an input method. 2246 * 2247 * <p>If you are using ActionBar in 2248 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2249 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2250 * insets it adds to those given to the application. 2251 */ 2252 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2253 2254 /** 2255 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2256 * to be layed out as if it has requested 2257 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2258 * allows it to avoid artifacts when switching in and out of that mode, at 2259 * the expense that some of its user interface may be covered by screen 2260 * decorations when they are shown. You can perform layout of your inner 2261 * UI elements to account for the navagation system UI through the 2262 * {@link #fitSystemWindows(Rect)} method. 2263 */ 2264 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2265 2266 /** 2267 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2268 * to be layed out as if it has requested 2269 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2270 * allows it to avoid artifacts when switching in and out of that mode, at 2271 * the expense that some of its user interface may be covered by screen 2272 * decorations when they are shown. You can perform layout of your inner 2273 * UI elements to account for non-fullscreen system UI through the 2274 * {@link #fitSystemWindows(Rect)} method. 2275 */ 2276 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2277 2278 /** 2279 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2280 */ 2281 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2282 2283 /** 2284 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2285 */ 2286 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2287 2288 /** 2289 * @hide 2290 * 2291 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2292 * out of the public fields to keep the undefined bits out of the developer's way. 2293 * 2294 * Flag to make the status bar not expandable. Unless you also 2295 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2296 */ 2297 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2298 2299 /** 2300 * @hide 2301 * 2302 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2303 * out of the public fields to keep the undefined bits out of the developer's way. 2304 * 2305 * Flag to hide notification icons and scrolling ticker text. 2306 */ 2307 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2308 2309 /** 2310 * @hide 2311 * 2312 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2313 * out of the public fields to keep the undefined bits out of the developer's way. 2314 * 2315 * Flag to disable incoming notification alerts. This will not block 2316 * icons, but it will block sound, vibrating and other visual or aural notifications. 2317 */ 2318 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2319 2320 /** 2321 * @hide 2322 * 2323 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2324 * out of the public fields to keep the undefined bits out of the developer's way. 2325 * 2326 * Flag to hide only the scrolling ticker. Note that 2327 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2328 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2329 */ 2330 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2331 2332 /** 2333 * @hide 2334 * 2335 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2336 * out of the public fields to keep the undefined bits out of the developer's way. 2337 * 2338 * Flag to hide the center system info area. 2339 */ 2340 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2341 2342 /** 2343 * @hide 2344 * 2345 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2346 * out of the public fields to keep the undefined bits out of the developer's way. 2347 * 2348 * Flag to hide only the home button. Don't use this 2349 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2350 */ 2351 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2352 2353 /** 2354 * @hide 2355 * 2356 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2357 * out of the public fields to keep the undefined bits out of the developer's way. 2358 * 2359 * Flag to hide only the back button. Don't use this 2360 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2361 */ 2362 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2363 2364 /** 2365 * @hide 2366 * 2367 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2368 * out of the public fields to keep the undefined bits out of the developer's way. 2369 * 2370 * Flag to hide only the clock. You might use this if your activity has 2371 * its own clock making the status bar's clock redundant. 2372 */ 2373 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2374 2375 /** 2376 * @hide 2377 * 2378 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2379 * out of the public fields to keep the undefined bits out of the developer's way. 2380 * 2381 * Flag to hide only the recent apps button. Don't use this 2382 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2383 */ 2384 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2385 2386 /** 2387 * @hide 2388 */ 2389 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2390 2391 /** 2392 * These are the system UI flags that can be cleared by events outside 2393 * of an application. Currently this is just the ability to tap on the 2394 * screen while hiding the navigation bar to have it return. 2395 * @hide 2396 */ 2397 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2398 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2399 | SYSTEM_UI_FLAG_FULLSCREEN; 2400 2401 /** 2402 * Flags that can impact the layout in relation to system UI. 2403 */ 2404 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2405 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2406 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2407 2408 /** 2409 * Find views that render the specified text. 2410 * 2411 * @see #findViewsWithText(ArrayList, CharSequence, int) 2412 */ 2413 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2414 2415 /** 2416 * Find find views that contain the specified content description. 2417 * 2418 * @see #findViewsWithText(ArrayList, CharSequence, int) 2419 */ 2420 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2421 2422 /** 2423 * Find views that contain {@link AccessibilityNodeProvider}. Such 2424 * a View is a root of virtual view hierarchy and may contain the searched 2425 * text. If this flag is set Views with providers are automatically 2426 * added and it is a responsibility of the client to call the APIs of 2427 * the provider to determine whether the virtual tree rooted at this View 2428 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2429 * represeting the virtual views with this text. 2430 * 2431 * @see #findViewsWithText(ArrayList, CharSequence, int) 2432 * 2433 * @hide 2434 */ 2435 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2436 2437 /** 2438 * Indicates that the screen has changed state and is now off. 2439 * 2440 * @see #onScreenStateChanged(int) 2441 */ 2442 public static final int SCREEN_STATE_OFF = 0x0; 2443 2444 /** 2445 * Indicates that the screen has changed state and is now on. 2446 * 2447 * @see #onScreenStateChanged(int) 2448 */ 2449 public static final int SCREEN_STATE_ON = 0x1; 2450 2451 /** 2452 * Controls the over-scroll mode for this view. 2453 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2454 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2455 * and {@link #OVER_SCROLL_NEVER}. 2456 */ 2457 private int mOverScrollMode; 2458 2459 /** 2460 * The parent this view is attached to. 2461 * {@hide} 2462 * 2463 * @see #getParent() 2464 */ 2465 protected ViewParent mParent; 2466 2467 /** 2468 * {@hide} 2469 */ 2470 AttachInfo mAttachInfo; 2471 2472 /** 2473 * {@hide} 2474 */ 2475 @ViewDebug.ExportedProperty(flagMapping = { 2476 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2477 name = "FORCE_LAYOUT"), 2478 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2479 name = "LAYOUT_REQUIRED"), 2480 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2481 name = "DRAWING_CACHE_INVALID", outputIf = false), 2482 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2483 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2484 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2485 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2486 }) 2487 int mPrivateFlags; 2488 int mPrivateFlags2; 2489 2490 /** 2491 * This view's request for the visibility of the status bar. 2492 * @hide 2493 */ 2494 @ViewDebug.ExportedProperty(flagMapping = { 2495 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2496 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2497 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2498 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2499 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2500 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2501 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2502 equals = SYSTEM_UI_FLAG_VISIBLE, 2503 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2504 }) 2505 int mSystemUiVisibility; 2506 2507 /** 2508 * Reference count for transient state. 2509 * @see #setHasTransientState(boolean) 2510 */ 2511 int mTransientStateCount = 0; 2512 2513 /** 2514 * Count of how many windows this view has been attached to. 2515 */ 2516 int mWindowAttachCount; 2517 2518 /** 2519 * The layout parameters associated with this view and used by the parent 2520 * {@link android.view.ViewGroup} to determine how this view should be 2521 * laid out. 2522 * {@hide} 2523 */ 2524 protected ViewGroup.LayoutParams mLayoutParams; 2525 2526 /** 2527 * The view flags hold various views states. 2528 * {@hide} 2529 */ 2530 @ViewDebug.ExportedProperty 2531 int mViewFlags; 2532 2533 static class TransformationInfo { 2534 /** 2535 * The transform matrix for the View. This transform is calculated internally 2536 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2537 * is used by default. Do *not* use this variable directly; instead call 2538 * getMatrix(), which will automatically recalculate the matrix if necessary 2539 * to get the correct matrix based on the latest rotation and scale properties. 2540 */ 2541 private final Matrix mMatrix = new Matrix(); 2542 2543 /** 2544 * The transform matrix for the View. This transform is calculated internally 2545 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2546 * is used by default. Do *not* use this variable directly; instead call 2547 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2548 * to get the correct matrix based on the latest rotation and scale properties. 2549 */ 2550 private Matrix mInverseMatrix; 2551 2552 /** 2553 * An internal variable that tracks whether we need to recalculate the 2554 * transform matrix, based on whether the rotation or scaleX/Y properties 2555 * have changed since the matrix was last calculated. 2556 */ 2557 boolean mMatrixDirty = false; 2558 2559 /** 2560 * An internal variable that tracks whether we need to recalculate the 2561 * transform matrix, based on whether the rotation or scaleX/Y properties 2562 * have changed since the matrix was last calculated. 2563 */ 2564 private boolean mInverseMatrixDirty = true; 2565 2566 /** 2567 * A variable that tracks whether we need to recalculate the 2568 * transform matrix, based on whether the rotation or scaleX/Y properties 2569 * have changed since the matrix was last calculated. This variable 2570 * is only valid after a call to updateMatrix() or to a function that 2571 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2572 */ 2573 private boolean mMatrixIsIdentity = true; 2574 2575 /** 2576 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2577 */ 2578 private Camera mCamera = null; 2579 2580 /** 2581 * This matrix is used when computing the matrix for 3D rotations. 2582 */ 2583 private Matrix matrix3D = null; 2584 2585 /** 2586 * These prev values are used to recalculate a centered pivot point when necessary. The 2587 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2588 * set), so thes values are only used then as well. 2589 */ 2590 private int mPrevWidth = -1; 2591 private int mPrevHeight = -1; 2592 2593 /** 2594 * The degrees rotation around the vertical axis through the pivot point. 2595 */ 2596 @ViewDebug.ExportedProperty 2597 float mRotationY = 0f; 2598 2599 /** 2600 * The degrees rotation around the horizontal axis through the pivot point. 2601 */ 2602 @ViewDebug.ExportedProperty 2603 float mRotationX = 0f; 2604 2605 /** 2606 * The degrees rotation around the pivot point. 2607 */ 2608 @ViewDebug.ExportedProperty 2609 float mRotation = 0f; 2610 2611 /** 2612 * The amount of translation of the object away from its left property (post-layout). 2613 */ 2614 @ViewDebug.ExportedProperty 2615 float mTranslationX = 0f; 2616 2617 /** 2618 * The amount of translation of the object away from its top property (post-layout). 2619 */ 2620 @ViewDebug.ExportedProperty 2621 float mTranslationY = 0f; 2622 2623 /** 2624 * The amount of scale in the x direction around the pivot point. A 2625 * value of 1 means no scaling is applied. 2626 */ 2627 @ViewDebug.ExportedProperty 2628 float mScaleX = 1f; 2629 2630 /** 2631 * The amount of scale in the y direction around the pivot point. A 2632 * value of 1 means no scaling is applied. 2633 */ 2634 @ViewDebug.ExportedProperty 2635 float mScaleY = 1f; 2636 2637 /** 2638 * The x location of the point around which the view is rotated and scaled. 2639 */ 2640 @ViewDebug.ExportedProperty 2641 float mPivotX = 0f; 2642 2643 /** 2644 * The y location of the point around which the view is rotated and scaled. 2645 */ 2646 @ViewDebug.ExportedProperty 2647 float mPivotY = 0f; 2648 2649 /** 2650 * The opacity of the View. This is a value from 0 to 1, where 0 means 2651 * completely transparent and 1 means completely opaque. 2652 */ 2653 @ViewDebug.ExportedProperty 2654 float mAlpha = 1f; 2655 } 2656 2657 TransformationInfo mTransformationInfo; 2658 2659 private boolean mLastIsOpaque; 2660 2661 /** 2662 * Convenience value to check for float values that are close enough to zero to be considered 2663 * zero. 2664 */ 2665 private static final float NONZERO_EPSILON = .001f; 2666 2667 /** 2668 * The distance in pixels from the left edge of this view's parent 2669 * to the left edge of this view. 2670 * {@hide} 2671 */ 2672 @ViewDebug.ExportedProperty(category = "layout") 2673 protected int mLeft; 2674 /** 2675 * The distance in pixels from the left edge of this view's parent 2676 * to the right edge of this view. 2677 * {@hide} 2678 */ 2679 @ViewDebug.ExportedProperty(category = "layout") 2680 protected int mRight; 2681 /** 2682 * The distance in pixels from the top edge of this view's parent 2683 * to the top edge of this view. 2684 * {@hide} 2685 */ 2686 @ViewDebug.ExportedProperty(category = "layout") 2687 protected int mTop; 2688 /** 2689 * The distance in pixels from the top edge of this view's parent 2690 * to the bottom edge of this view. 2691 * {@hide} 2692 */ 2693 @ViewDebug.ExportedProperty(category = "layout") 2694 protected int mBottom; 2695 2696 /** 2697 * The offset, in pixels, by which the content of this view is scrolled 2698 * horizontally. 2699 * {@hide} 2700 */ 2701 @ViewDebug.ExportedProperty(category = "scrolling") 2702 protected int mScrollX; 2703 /** 2704 * The offset, in pixels, by which the content of this view is scrolled 2705 * vertically. 2706 * {@hide} 2707 */ 2708 @ViewDebug.ExportedProperty(category = "scrolling") 2709 protected int mScrollY; 2710 2711 /** 2712 * The left padding in pixels, that is the distance in pixels between the 2713 * left edge of this view and the left edge of its content. 2714 * {@hide} 2715 */ 2716 @ViewDebug.ExportedProperty(category = "padding") 2717 protected int mPaddingLeft; 2718 /** 2719 * The right padding in pixels, that is the distance in pixels between the 2720 * right edge of this view and the right edge of its content. 2721 * {@hide} 2722 */ 2723 @ViewDebug.ExportedProperty(category = "padding") 2724 protected int mPaddingRight; 2725 /** 2726 * The top padding in pixels, that is the distance in pixels between the 2727 * top edge of this view and the top edge of its content. 2728 * {@hide} 2729 */ 2730 @ViewDebug.ExportedProperty(category = "padding") 2731 protected int mPaddingTop; 2732 /** 2733 * The bottom padding in pixels, that is the distance in pixels between the 2734 * bottom edge of this view and the bottom edge of its content. 2735 * {@hide} 2736 */ 2737 @ViewDebug.ExportedProperty(category = "padding") 2738 protected int mPaddingBottom; 2739 2740 /** 2741 * The layout insets in pixels, that is the distance in pixels between the 2742 * visible edges of this view its bounds. 2743 */ 2744 private Insets mLayoutInsets; 2745 2746 /** 2747 * Briefly describes the view and is primarily used for accessibility support. 2748 */ 2749 private CharSequence mContentDescription; 2750 2751 /** 2752 * Cache the paddingRight set by the user to append to the scrollbar's size. 2753 * 2754 * @hide 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 protected int mUserPaddingRight; 2758 2759 /** 2760 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2761 * 2762 * @hide 2763 */ 2764 @ViewDebug.ExportedProperty(category = "padding") 2765 protected int mUserPaddingBottom; 2766 2767 /** 2768 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2769 * 2770 * @hide 2771 */ 2772 @ViewDebug.ExportedProperty(category = "padding") 2773 protected int mUserPaddingLeft; 2774 2775 /** 2776 * Cache if the user padding is relative. 2777 * 2778 */ 2779 @ViewDebug.ExportedProperty(category = "padding") 2780 boolean mUserPaddingRelative; 2781 2782 /** 2783 * Cache the paddingStart set by the user to append to the scrollbar's size. 2784 * 2785 */ 2786 @ViewDebug.ExportedProperty(category = "padding") 2787 int mUserPaddingStart; 2788 2789 /** 2790 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2791 * 2792 */ 2793 @ViewDebug.ExportedProperty(category = "padding") 2794 int mUserPaddingEnd; 2795 2796 /** 2797 * @hide 2798 */ 2799 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2800 /** 2801 * @hide 2802 */ 2803 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2804 2805 private Drawable mBackground; 2806 2807 private int mBackgroundResource; 2808 private boolean mBackgroundSizeChanged; 2809 2810 static class ListenerInfo { 2811 /** 2812 * Listener used to dispatch focus change events. 2813 * This field should be made private, so it is hidden from the SDK. 2814 * {@hide} 2815 */ 2816 protected OnFocusChangeListener mOnFocusChangeListener; 2817 2818 /** 2819 * Listeners for layout change events. 2820 */ 2821 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2822 2823 /** 2824 * Listeners for attach events. 2825 */ 2826 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2827 2828 /** 2829 * Listener used to dispatch click events. 2830 * This field should be made private, so it is hidden from the SDK. 2831 * {@hide} 2832 */ 2833 public OnClickListener mOnClickListener; 2834 2835 /** 2836 * Listener used to dispatch long click events. 2837 * This field should be made private, so it is hidden from the SDK. 2838 * {@hide} 2839 */ 2840 protected OnLongClickListener mOnLongClickListener; 2841 2842 /** 2843 * Listener used to build the context menu. 2844 * This field should be made private, so it is hidden from the SDK. 2845 * {@hide} 2846 */ 2847 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2848 2849 private OnKeyListener mOnKeyListener; 2850 2851 private OnTouchListener mOnTouchListener; 2852 2853 private OnHoverListener mOnHoverListener; 2854 2855 private OnGenericMotionListener mOnGenericMotionListener; 2856 2857 private OnDragListener mOnDragListener; 2858 2859 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2860 } 2861 2862 ListenerInfo mListenerInfo; 2863 2864 /** 2865 * The application environment this view lives in. 2866 * This field should be made private, so it is hidden from the SDK. 2867 * {@hide} 2868 */ 2869 protected Context mContext; 2870 2871 private final Resources mResources; 2872 2873 private ScrollabilityCache mScrollCache; 2874 2875 private int[] mDrawableState = null; 2876 2877 /** 2878 * Set to true when drawing cache is enabled and cannot be created. 2879 * 2880 * @hide 2881 */ 2882 public boolean mCachingFailed; 2883 2884 private Bitmap mDrawingCache; 2885 private Bitmap mUnscaledDrawingCache; 2886 private HardwareLayer mHardwareLayer; 2887 DisplayList mDisplayList; 2888 2889 /** 2890 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2891 * the user may specify which view to go to next. 2892 */ 2893 private int mNextFocusLeftId = View.NO_ID; 2894 2895 /** 2896 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2897 * the user may specify which view to go to next. 2898 */ 2899 private int mNextFocusRightId = View.NO_ID; 2900 2901 /** 2902 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2903 * the user may specify which view to go to next. 2904 */ 2905 private int mNextFocusUpId = View.NO_ID; 2906 2907 /** 2908 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2909 * the user may specify which view to go to next. 2910 */ 2911 private int mNextFocusDownId = View.NO_ID; 2912 2913 /** 2914 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2915 * the user may specify which view to go to next. 2916 */ 2917 int mNextFocusForwardId = View.NO_ID; 2918 2919 private CheckForLongPress mPendingCheckForLongPress; 2920 private CheckForTap mPendingCheckForTap = null; 2921 private PerformClick mPerformClick; 2922 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2923 2924 private UnsetPressedState mUnsetPressedState; 2925 2926 /** 2927 * Whether the long press's action has been invoked. The tap's action is invoked on the 2928 * up event while a long press is invoked as soon as the long press duration is reached, so 2929 * a long press could be performed before the tap is checked, in which case the tap's action 2930 * should not be invoked. 2931 */ 2932 private boolean mHasPerformedLongPress; 2933 2934 /** 2935 * The minimum height of the view. We'll try our best to have the height 2936 * of this view to at least this amount. 2937 */ 2938 @ViewDebug.ExportedProperty(category = "measurement") 2939 private int mMinHeight; 2940 2941 /** 2942 * The minimum width of the view. We'll try our best to have the width 2943 * of this view to at least this amount. 2944 */ 2945 @ViewDebug.ExportedProperty(category = "measurement") 2946 private int mMinWidth; 2947 2948 /** 2949 * The delegate to handle touch events that are physically in this view 2950 * but should be handled by another view. 2951 */ 2952 private TouchDelegate mTouchDelegate = null; 2953 2954 /** 2955 * Solid color to use as a background when creating the drawing cache. Enables 2956 * the cache to use 16 bit bitmaps instead of 32 bit. 2957 */ 2958 private int mDrawingCacheBackgroundColor = 0; 2959 2960 /** 2961 * Special tree observer used when mAttachInfo is null. 2962 */ 2963 private ViewTreeObserver mFloatingTreeObserver; 2964 2965 /** 2966 * Cache the touch slop from the context that created the view. 2967 */ 2968 private int mTouchSlop; 2969 2970 /** 2971 * Object that handles automatic animation of view properties. 2972 */ 2973 private ViewPropertyAnimator mAnimator = null; 2974 2975 /** 2976 * Flag indicating that a drag can cross window boundaries. When 2977 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2978 * with this flag set, all visible applications will be able to participate 2979 * in the drag operation and receive the dragged content. 2980 * 2981 * @hide 2982 */ 2983 public static final int DRAG_FLAG_GLOBAL = 1; 2984 2985 /** 2986 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2987 */ 2988 private float mVerticalScrollFactor; 2989 2990 /** 2991 * Position of the vertical scroll bar. 2992 */ 2993 private int mVerticalScrollbarPosition; 2994 2995 /** 2996 * Position the scroll bar at the default position as determined by the system. 2997 */ 2998 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2999 3000 /** 3001 * Position the scroll bar along the left edge. 3002 */ 3003 public static final int SCROLLBAR_POSITION_LEFT = 1; 3004 3005 /** 3006 * Position the scroll bar along the right edge. 3007 */ 3008 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3009 3010 /** 3011 * Indicates that the view does not have a layer. 3012 * 3013 * @see #getLayerType() 3014 * @see #setLayerType(int, android.graphics.Paint) 3015 * @see #LAYER_TYPE_SOFTWARE 3016 * @see #LAYER_TYPE_HARDWARE 3017 */ 3018 public static final int LAYER_TYPE_NONE = 0; 3019 3020 /** 3021 * <p>Indicates that the view has a software layer. A software layer is backed 3022 * by a bitmap and causes the view to be rendered using Android's software 3023 * rendering pipeline, even if hardware acceleration is enabled.</p> 3024 * 3025 * <p>Software layers have various usages:</p> 3026 * <p>When the application is not using hardware acceleration, a software layer 3027 * is useful to apply a specific color filter and/or blending mode and/or 3028 * translucency to a view and all its children.</p> 3029 * <p>When the application is using hardware acceleration, a software layer 3030 * is useful to render drawing primitives not supported by the hardware 3031 * accelerated pipeline. It can also be used to cache a complex view tree 3032 * into a texture and reduce the complexity of drawing operations. For instance, 3033 * when animating a complex view tree with a translation, a software layer can 3034 * be used to render the view tree only once.</p> 3035 * <p>Software layers should be avoided when the affected view tree updates 3036 * often. Every update will require to re-render the software layer, which can 3037 * potentially be slow (particularly when hardware acceleration is turned on 3038 * since the layer will have to be uploaded into a hardware texture after every 3039 * update.)</p> 3040 * 3041 * @see #getLayerType() 3042 * @see #setLayerType(int, android.graphics.Paint) 3043 * @see #LAYER_TYPE_NONE 3044 * @see #LAYER_TYPE_HARDWARE 3045 */ 3046 public static final int LAYER_TYPE_SOFTWARE = 1; 3047 3048 /** 3049 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3050 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3051 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3052 * rendering pipeline, but only if hardware acceleration is turned on for the 3053 * view hierarchy. When hardware acceleration is turned off, hardware layers 3054 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3055 * 3056 * <p>A hardware layer is useful to apply a specific color filter and/or 3057 * blending mode and/or translucency to a view and all its children.</p> 3058 * <p>A hardware layer can be used to cache a complex view tree into a 3059 * texture and reduce the complexity of drawing operations. For instance, 3060 * when animating a complex view tree with a translation, a hardware layer can 3061 * be used to render the view tree only once.</p> 3062 * <p>A hardware layer can also be used to increase the rendering quality when 3063 * rotation transformations are applied on a view. It can also be used to 3064 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3065 * 3066 * @see #getLayerType() 3067 * @see #setLayerType(int, android.graphics.Paint) 3068 * @see #LAYER_TYPE_NONE 3069 * @see #LAYER_TYPE_SOFTWARE 3070 */ 3071 public static final int LAYER_TYPE_HARDWARE = 2; 3072 3073 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3074 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3075 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3076 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3077 }) 3078 int mLayerType = LAYER_TYPE_NONE; 3079 Paint mLayerPaint; 3080 Rect mLocalDirtyRect; 3081 3082 /** 3083 * Set to true when the view is sending hover accessibility events because it 3084 * is the innermost hovered view. 3085 */ 3086 private boolean mSendingHoverAccessibilityEvents; 3087 3088 /** 3089 * Simple constructor to use when creating a view from code. 3090 * 3091 * @param context The Context the view is running in, through which it can 3092 * access the current theme, resources, etc. 3093 */ 3094 public View(Context context) { 3095 mContext = context; 3096 mResources = context != null ? context.getResources() : null; 3097 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3098 // Set layout and text direction defaults 3099 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3100 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3101 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3102 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3103 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3104 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3105 mUserPaddingStart = -1; 3106 mUserPaddingEnd = -1; 3107 mUserPaddingRelative = false; 3108 } 3109 3110 /** 3111 * Delegate for injecting accessiblity functionality. 3112 */ 3113 AccessibilityDelegate mAccessibilityDelegate; 3114 3115 /** 3116 * Consistency verifier for debugging purposes. 3117 * @hide 3118 */ 3119 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3120 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3121 new InputEventConsistencyVerifier(this, 0) : null; 3122 3123 /** 3124 * Constructor that is called when inflating a view from XML. This is called 3125 * when a view is being constructed from an XML file, supplying attributes 3126 * that were specified in the XML file. This version uses a default style of 3127 * 0, so the only attribute values applied are those in the Context's Theme 3128 * and the given AttributeSet. 3129 * 3130 * <p> 3131 * The method onFinishInflate() will be called after all children have been 3132 * added. 3133 * 3134 * @param context The Context the view is running in, through which it can 3135 * access the current theme, resources, etc. 3136 * @param attrs The attributes of the XML tag that is inflating the view. 3137 * @see #View(Context, AttributeSet, int) 3138 */ 3139 public View(Context context, AttributeSet attrs) { 3140 this(context, attrs, 0); 3141 } 3142 3143 /** 3144 * Perform inflation from XML and apply a class-specific base style. This 3145 * constructor of View allows subclasses to use their own base style when 3146 * they are inflating. For example, a Button class's constructor would call 3147 * this version of the super class constructor and supply 3148 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3149 * the theme's button style to modify all of the base view attributes (in 3150 * particular its background) as well as the Button class's attributes. 3151 * 3152 * @param context The Context the view is running in, through which it can 3153 * access the current theme, resources, etc. 3154 * @param attrs The attributes of the XML tag that is inflating the view. 3155 * @param defStyle The default style to apply to this view. If 0, no style 3156 * will be applied (beyond what is included in the theme). This may 3157 * either be an attribute resource, whose value will be retrieved 3158 * from the current theme, or an explicit style resource. 3159 * @see #View(Context, AttributeSet) 3160 */ 3161 public View(Context context, AttributeSet attrs, int defStyle) { 3162 this(context); 3163 3164 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3165 defStyle, 0); 3166 3167 Drawable background = null; 3168 3169 int leftPadding = -1; 3170 int topPadding = -1; 3171 int rightPadding = -1; 3172 int bottomPadding = -1; 3173 int startPadding = -1; 3174 int endPadding = -1; 3175 3176 int padding = -1; 3177 3178 int viewFlagValues = 0; 3179 int viewFlagMasks = 0; 3180 3181 boolean setScrollContainer = false; 3182 3183 int x = 0; 3184 int y = 0; 3185 3186 float tx = 0; 3187 float ty = 0; 3188 float rotation = 0; 3189 float rotationX = 0; 3190 float rotationY = 0; 3191 float sx = 1f; 3192 float sy = 1f; 3193 boolean transformSet = false; 3194 3195 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3196 3197 int overScrollMode = mOverScrollMode; 3198 final int N = a.getIndexCount(); 3199 for (int i = 0; i < N; i++) { 3200 int attr = a.getIndex(i); 3201 switch (attr) { 3202 case com.android.internal.R.styleable.View_background: 3203 background = a.getDrawable(attr); 3204 break; 3205 case com.android.internal.R.styleable.View_padding: 3206 padding = a.getDimensionPixelSize(attr, -1); 3207 break; 3208 case com.android.internal.R.styleable.View_paddingLeft: 3209 leftPadding = a.getDimensionPixelSize(attr, -1); 3210 break; 3211 case com.android.internal.R.styleable.View_paddingTop: 3212 topPadding = a.getDimensionPixelSize(attr, -1); 3213 break; 3214 case com.android.internal.R.styleable.View_paddingRight: 3215 rightPadding = a.getDimensionPixelSize(attr, -1); 3216 break; 3217 case com.android.internal.R.styleable.View_paddingBottom: 3218 bottomPadding = a.getDimensionPixelSize(attr, -1); 3219 break; 3220 case com.android.internal.R.styleable.View_paddingStart: 3221 startPadding = a.getDimensionPixelSize(attr, -1); 3222 break; 3223 case com.android.internal.R.styleable.View_paddingEnd: 3224 endPadding = a.getDimensionPixelSize(attr, -1); 3225 break; 3226 case com.android.internal.R.styleable.View_scrollX: 3227 x = a.getDimensionPixelOffset(attr, 0); 3228 break; 3229 case com.android.internal.R.styleable.View_scrollY: 3230 y = a.getDimensionPixelOffset(attr, 0); 3231 break; 3232 case com.android.internal.R.styleable.View_alpha: 3233 setAlpha(a.getFloat(attr, 1f)); 3234 break; 3235 case com.android.internal.R.styleable.View_transformPivotX: 3236 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3237 break; 3238 case com.android.internal.R.styleable.View_transformPivotY: 3239 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3240 break; 3241 case com.android.internal.R.styleable.View_translationX: 3242 tx = a.getDimensionPixelOffset(attr, 0); 3243 transformSet = true; 3244 break; 3245 case com.android.internal.R.styleable.View_translationY: 3246 ty = a.getDimensionPixelOffset(attr, 0); 3247 transformSet = true; 3248 break; 3249 case com.android.internal.R.styleable.View_rotation: 3250 rotation = a.getFloat(attr, 0); 3251 transformSet = true; 3252 break; 3253 case com.android.internal.R.styleable.View_rotationX: 3254 rotationX = a.getFloat(attr, 0); 3255 transformSet = true; 3256 break; 3257 case com.android.internal.R.styleable.View_rotationY: 3258 rotationY = a.getFloat(attr, 0); 3259 transformSet = true; 3260 break; 3261 case com.android.internal.R.styleable.View_scaleX: 3262 sx = a.getFloat(attr, 1f); 3263 transformSet = true; 3264 break; 3265 case com.android.internal.R.styleable.View_scaleY: 3266 sy = a.getFloat(attr, 1f); 3267 transformSet = true; 3268 break; 3269 case com.android.internal.R.styleable.View_id: 3270 mID = a.getResourceId(attr, NO_ID); 3271 break; 3272 case com.android.internal.R.styleable.View_tag: 3273 mTag = a.getText(attr); 3274 break; 3275 case com.android.internal.R.styleable.View_fitsSystemWindows: 3276 if (a.getBoolean(attr, false)) { 3277 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3278 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3279 } 3280 break; 3281 case com.android.internal.R.styleable.View_focusable: 3282 if (a.getBoolean(attr, false)) { 3283 viewFlagValues |= FOCUSABLE; 3284 viewFlagMasks |= FOCUSABLE_MASK; 3285 } 3286 break; 3287 case com.android.internal.R.styleable.View_focusableInTouchMode: 3288 if (a.getBoolean(attr, false)) { 3289 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3290 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3291 } 3292 break; 3293 case com.android.internal.R.styleable.View_clickable: 3294 if (a.getBoolean(attr, false)) { 3295 viewFlagValues |= CLICKABLE; 3296 viewFlagMasks |= CLICKABLE; 3297 } 3298 break; 3299 case com.android.internal.R.styleable.View_longClickable: 3300 if (a.getBoolean(attr, false)) { 3301 viewFlagValues |= LONG_CLICKABLE; 3302 viewFlagMasks |= LONG_CLICKABLE; 3303 } 3304 break; 3305 case com.android.internal.R.styleable.View_saveEnabled: 3306 if (!a.getBoolean(attr, true)) { 3307 viewFlagValues |= SAVE_DISABLED; 3308 viewFlagMasks |= SAVE_DISABLED_MASK; 3309 } 3310 break; 3311 case com.android.internal.R.styleable.View_duplicateParentState: 3312 if (a.getBoolean(attr, false)) { 3313 viewFlagValues |= DUPLICATE_PARENT_STATE; 3314 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3315 } 3316 break; 3317 case com.android.internal.R.styleable.View_visibility: 3318 final int visibility = a.getInt(attr, 0); 3319 if (visibility != 0) { 3320 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3321 viewFlagMasks |= VISIBILITY_MASK; 3322 } 3323 break; 3324 case com.android.internal.R.styleable.View_layoutDirection: 3325 // Clear any layout direction flags (included resolved bits) already set 3326 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3327 // Set the layout direction flags depending on the value of the attribute 3328 final int layoutDirection = a.getInt(attr, -1); 3329 final int value = (layoutDirection != -1) ? 3330 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3331 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3332 break; 3333 case com.android.internal.R.styleable.View_drawingCacheQuality: 3334 final int cacheQuality = a.getInt(attr, 0); 3335 if (cacheQuality != 0) { 3336 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3337 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3338 } 3339 break; 3340 case com.android.internal.R.styleable.View_contentDescription: 3341 mContentDescription = a.getString(attr); 3342 break; 3343 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3344 if (!a.getBoolean(attr, true)) { 3345 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3346 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3347 } 3348 break; 3349 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3350 if (!a.getBoolean(attr, true)) { 3351 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3352 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3353 } 3354 break; 3355 case R.styleable.View_scrollbars: 3356 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3357 if (scrollbars != SCROLLBARS_NONE) { 3358 viewFlagValues |= scrollbars; 3359 viewFlagMasks |= SCROLLBARS_MASK; 3360 initializeScrollbars(a); 3361 } 3362 break; 3363 //noinspection deprecation 3364 case R.styleable.View_fadingEdge: 3365 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3366 // Ignore the attribute starting with ICS 3367 break; 3368 } 3369 // With builds < ICS, fall through and apply fading edges 3370 case R.styleable.View_requiresFadingEdge: 3371 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3372 if (fadingEdge != FADING_EDGE_NONE) { 3373 viewFlagValues |= fadingEdge; 3374 viewFlagMasks |= FADING_EDGE_MASK; 3375 initializeFadingEdge(a); 3376 } 3377 break; 3378 case R.styleable.View_scrollbarStyle: 3379 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3380 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3381 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3382 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3383 } 3384 break; 3385 case R.styleable.View_isScrollContainer: 3386 setScrollContainer = true; 3387 if (a.getBoolean(attr, false)) { 3388 setScrollContainer(true); 3389 } 3390 break; 3391 case com.android.internal.R.styleable.View_keepScreenOn: 3392 if (a.getBoolean(attr, false)) { 3393 viewFlagValues |= KEEP_SCREEN_ON; 3394 viewFlagMasks |= KEEP_SCREEN_ON; 3395 } 3396 break; 3397 case R.styleable.View_filterTouchesWhenObscured: 3398 if (a.getBoolean(attr, false)) { 3399 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3400 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3401 } 3402 break; 3403 case R.styleable.View_nextFocusLeft: 3404 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3405 break; 3406 case R.styleable.View_nextFocusRight: 3407 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3408 break; 3409 case R.styleable.View_nextFocusUp: 3410 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3411 break; 3412 case R.styleable.View_nextFocusDown: 3413 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3414 break; 3415 case R.styleable.View_nextFocusForward: 3416 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3417 break; 3418 case R.styleable.View_minWidth: 3419 mMinWidth = a.getDimensionPixelSize(attr, 0); 3420 break; 3421 case R.styleable.View_minHeight: 3422 mMinHeight = a.getDimensionPixelSize(attr, 0); 3423 break; 3424 case R.styleable.View_onClick: 3425 if (context.isRestricted()) { 3426 throw new IllegalStateException("The android:onClick attribute cannot " 3427 + "be used within a restricted context"); 3428 } 3429 3430 final String handlerName = a.getString(attr); 3431 if (handlerName != null) { 3432 setOnClickListener(new OnClickListener() { 3433 private Method mHandler; 3434 3435 public void onClick(View v) { 3436 if (mHandler == null) { 3437 try { 3438 mHandler = getContext().getClass().getMethod(handlerName, 3439 View.class); 3440 } catch (NoSuchMethodException e) { 3441 int id = getId(); 3442 String idText = id == NO_ID ? "" : " with id '" 3443 + getContext().getResources().getResourceEntryName( 3444 id) + "'"; 3445 throw new IllegalStateException("Could not find a method " + 3446 handlerName + "(View) in the activity " 3447 + getContext().getClass() + " for onClick handler" 3448 + " on view " + View.this.getClass() + idText, e); 3449 } 3450 } 3451 3452 try { 3453 mHandler.invoke(getContext(), View.this); 3454 } catch (IllegalAccessException e) { 3455 throw new IllegalStateException("Could not execute non " 3456 + "public method of the activity", e); 3457 } catch (InvocationTargetException e) { 3458 throw new IllegalStateException("Could not execute " 3459 + "method of the activity", e); 3460 } 3461 } 3462 }); 3463 } 3464 break; 3465 case R.styleable.View_overScrollMode: 3466 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3467 break; 3468 case R.styleable.View_verticalScrollbarPosition: 3469 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3470 break; 3471 case R.styleable.View_layerType: 3472 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3473 break; 3474 case R.styleable.View_textDirection: 3475 // Clear any text direction flag already set 3476 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3477 // Set the text direction flags depending on the value of the attribute 3478 final int textDirection = a.getInt(attr, -1); 3479 if (textDirection != -1) { 3480 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3481 } 3482 break; 3483 case R.styleable.View_textAlignment: 3484 // Clear any text alignment flag already set 3485 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3486 // Set the text alignment flag depending on the value of the attribute 3487 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3488 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3489 break; 3490 case R.styleable.View_importantForAccessibility: 3491 setImportantForAccessibility(a.getInt(attr, 3492 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3493 } 3494 } 3495 3496 a.recycle(); 3497 3498 setOverScrollMode(overScrollMode); 3499 3500 if (background != null) { 3501 setBackground(background); 3502 } 3503 3504 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3505 // layout direction). Those cached values will be used later during padding resolution. 3506 mUserPaddingStart = startPadding; 3507 mUserPaddingEnd = endPadding; 3508 3509 updateUserPaddingRelative(); 3510 3511 if (padding >= 0) { 3512 leftPadding = padding; 3513 topPadding = padding; 3514 rightPadding = padding; 3515 bottomPadding = padding; 3516 } 3517 3518 // If the user specified the padding (either with android:padding or 3519 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3520 // use the default padding or the padding from the background drawable 3521 // (stored at this point in mPadding*) 3522 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3523 topPadding >= 0 ? topPadding : mPaddingTop, 3524 rightPadding >= 0 ? rightPadding : mPaddingRight, 3525 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3526 3527 if (viewFlagMasks != 0) { 3528 setFlags(viewFlagValues, viewFlagMasks); 3529 } 3530 3531 // Needs to be called after mViewFlags is set 3532 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3533 recomputePadding(); 3534 } 3535 3536 if (x != 0 || y != 0) { 3537 scrollTo(x, y); 3538 } 3539 3540 if (transformSet) { 3541 setTranslationX(tx); 3542 setTranslationY(ty); 3543 setRotation(rotation); 3544 setRotationX(rotationX); 3545 setRotationY(rotationY); 3546 setScaleX(sx); 3547 setScaleY(sy); 3548 } 3549 3550 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3551 setScrollContainer(true); 3552 } 3553 3554 computeOpaqueFlags(); 3555 } 3556 3557 private void updateUserPaddingRelative() { 3558 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3559 } 3560 3561 /** 3562 * Non-public constructor for use in testing 3563 */ 3564 View() { 3565 mResources = null; 3566 } 3567 3568 /** 3569 * <p> 3570 * Initializes the fading edges from a given set of styled attributes. This 3571 * method should be called by subclasses that need fading edges and when an 3572 * instance of these subclasses is created programmatically rather than 3573 * being inflated from XML. This method is automatically called when the XML 3574 * is inflated. 3575 * </p> 3576 * 3577 * @param a the styled attributes set to initialize the fading edges from 3578 */ 3579 protected void initializeFadingEdge(TypedArray a) { 3580 initScrollCache(); 3581 3582 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3583 R.styleable.View_fadingEdgeLength, 3584 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3585 } 3586 3587 /** 3588 * Returns the size of the vertical faded edges used to indicate that more 3589 * content in this view is visible. 3590 * 3591 * @return The size in pixels of the vertical faded edge or 0 if vertical 3592 * faded edges are not enabled for this view. 3593 * @attr ref android.R.styleable#View_fadingEdgeLength 3594 */ 3595 public int getVerticalFadingEdgeLength() { 3596 if (isVerticalFadingEdgeEnabled()) { 3597 ScrollabilityCache cache = mScrollCache; 3598 if (cache != null) { 3599 return cache.fadingEdgeLength; 3600 } 3601 } 3602 return 0; 3603 } 3604 3605 /** 3606 * Set the size of the faded edge used to indicate that more content in this 3607 * view is available. Will not change whether the fading edge is enabled; use 3608 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3609 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3610 * for the vertical or horizontal fading edges. 3611 * 3612 * @param length The size in pixels of the faded edge used to indicate that more 3613 * content in this view is visible. 3614 */ 3615 public void setFadingEdgeLength(int length) { 3616 initScrollCache(); 3617 mScrollCache.fadingEdgeLength = length; 3618 } 3619 3620 /** 3621 * Returns the size of the horizontal faded edges used to indicate that more 3622 * content in this view is visible. 3623 * 3624 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3625 * faded edges are not enabled for this view. 3626 * @attr ref android.R.styleable#View_fadingEdgeLength 3627 */ 3628 public int getHorizontalFadingEdgeLength() { 3629 if (isHorizontalFadingEdgeEnabled()) { 3630 ScrollabilityCache cache = mScrollCache; 3631 if (cache != null) { 3632 return cache.fadingEdgeLength; 3633 } 3634 } 3635 return 0; 3636 } 3637 3638 /** 3639 * Returns the width of the vertical scrollbar. 3640 * 3641 * @return The width in pixels of the vertical scrollbar or 0 if there 3642 * is no vertical scrollbar. 3643 */ 3644 public int getVerticalScrollbarWidth() { 3645 ScrollabilityCache cache = mScrollCache; 3646 if (cache != null) { 3647 ScrollBarDrawable scrollBar = cache.scrollBar; 3648 if (scrollBar != null) { 3649 int size = scrollBar.getSize(true); 3650 if (size <= 0) { 3651 size = cache.scrollBarSize; 3652 } 3653 return size; 3654 } 3655 return 0; 3656 } 3657 return 0; 3658 } 3659 3660 /** 3661 * Returns the height of the horizontal scrollbar. 3662 * 3663 * @return The height in pixels of the horizontal scrollbar or 0 if 3664 * there is no horizontal scrollbar. 3665 */ 3666 protected int getHorizontalScrollbarHeight() { 3667 ScrollabilityCache cache = mScrollCache; 3668 if (cache != null) { 3669 ScrollBarDrawable scrollBar = cache.scrollBar; 3670 if (scrollBar != null) { 3671 int size = scrollBar.getSize(false); 3672 if (size <= 0) { 3673 size = cache.scrollBarSize; 3674 } 3675 return size; 3676 } 3677 return 0; 3678 } 3679 return 0; 3680 } 3681 3682 /** 3683 * <p> 3684 * Initializes the scrollbars from a given set of styled attributes. This 3685 * method should be called by subclasses that need scrollbars and when an 3686 * instance of these subclasses is created programmatically rather than 3687 * being inflated from XML. This method is automatically called when the XML 3688 * is inflated. 3689 * </p> 3690 * 3691 * @param a the styled attributes set to initialize the scrollbars from 3692 */ 3693 protected void initializeScrollbars(TypedArray a) { 3694 initScrollCache(); 3695 3696 final ScrollabilityCache scrollabilityCache = mScrollCache; 3697 3698 if (scrollabilityCache.scrollBar == null) { 3699 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3700 } 3701 3702 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3703 3704 if (!fadeScrollbars) { 3705 scrollabilityCache.state = ScrollabilityCache.ON; 3706 } 3707 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3708 3709 3710 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3711 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3712 .getScrollBarFadeDuration()); 3713 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3714 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3715 ViewConfiguration.getScrollDefaultDelay()); 3716 3717 3718 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3719 com.android.internal.R.styleable.View_scrollbarSize, 3720 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3721 3722 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3723 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3724 3725 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3726 if (thumb != null) { 3727 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3728 } 3729 3730 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3731 false); 3732 if (alwaysDraw) { 3733 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3734 } 3735 3736 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3737 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3738 3739 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3740 if (thumb != null) { 3741 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3742 } 3743 3744 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3745 false); 3746 if (alwaysDraw) { 3747 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3748 } 3749 3750 // Re-apply user/background padding so that scrollbar(s) get added 3751 resolvePadding(); 3752 } 3753 3754 /** 3755 * <p> 3756 * Initalizes the scrollability cache if necessary. 3757 * </p> 3758 */ 3759 private void initScrollCache() { 3760 if (mScrollCache == null) { 3761 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3762 } 3763 } 3764 3765 private ScrollabilityCache getScrollCache() { 3766 initScrollCache(); 3767 return mScrollCache; 3768 } 3769 3770 /** 3771 * Set the position of the vertical scroll bar. Should be one of 3772 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3773 * {@link #SCROLLBAR_POSITION_RIGHT}. 3774 * 3775 * @param position Where the vertical scroll bar should be positioned. 3776 */ 3777 public void setVerticalScrollbarPosition(int position) { 3778 if (mVerticalScrollbarPosition != position) { 3779 mVerticalScrollbarPosition = position; 3780 computeOpaqueFlags(); 3781 resolvePadding(); 3782 } 3783 } 3784 3785 /** 3786 * @return The position where the vertical scroll bar will show, if applicable. 3787 * @see #setVerticalScrollbarPosition(int) 3788 */ 3789 public int getVerticalScrollbarPosition() { 3790 return mVerticalScrollbarPosition; 3791 } 3792 3793 ListenerInfo getListenerInfo() { 3794 if (mListenerInfo != null) { 3795 return mListenerInfo; 3796 } 3797 mListenerInfo = new ListenerInfo(); 3798 return mListenerInfo; 3799 } 3800 3801 /** 3802 * Register a callback to be invoked when focus of this view changed. 3803 * 3804 * @param l The callback that will run. 3805 */ 3806 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3807 getListenerInfo().mOnFocusChangeListener = l; 3808 } 3809 3810 /** 3811 * Add a listener that will be called when the bounds of the view change due to 3812 * layout processing. 3813 * 3814 * @param listener The listener that will be called when layout bounds change. 3815 */ 3816 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3817 ListenerInfo li = getListenerInfo(); 3818 if (li.mOnLayoutChangeListeners == null) { 3819 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3820 } 3821 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3822 li.mOnLayoutChangeListeners.add(listener); 3823 } 3824 } 3825 3826 /** 3827 * Remove a listener for layout changes. 3828 * 3829 * @param listener The listener for layout bounds change. 3830 */ 3831 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3832 ListenerInfo li = mListenerInfo; 3833 if (li == null || li.mOnLayoutChangeListeners == null) { 3834 return; 3835 } 3836 li.mOnLayoutChangeListeners.remove(listener); 3837 } 3838 3839 /** 3840 * Add a listener for attach state changes. 3841 * 3842 * This listener will be called whenever this view is attached or detached 3843 * from a window. Remove the listener using 3844 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3845 * 3846 * @param listener Listener to attach 3847 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3848 */ 3849 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3850 ListenerInfo li = getListenerInfo(); 3851 if (li.mOnAttachStateChangeListeners == null) { 3852 li.mOnAttachStateChangeListeners 3853 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3854 } 3855 li.mOnAttachStateChangeListeners.add(listener); 3856 } 3857 3858 /** 3859 * Remove a listener for attach state changes. The listener will receive no further 3860 * notification of window attach/detach events. 3861 * 3862 * @param listener Listener to remove 3863 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3864 */ 3865 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3866 ListenerInfo li = mListenerInfo; 3867 if (li == null || li.mOnAttachStateChangeListeners == null) { 3868 return; 3869 } 3870 li.mOnAttachStateChangeListeners.remove(listener); 3871 } 3872 3873 /** 3874 * Returns the focus-change callback registered for this view. 3875 * 3876 * @return The callback, or null if one is not registered. 3877 */ 3878 public OnFocusChangeListener getOnFocusChangeListener() { 3879 ListenerInfo li = mListenerInfo; 3880 return li != null ? li.mOnFocusChangeListener : null; 3881 } 3882 3883 /** 3884 * Register a callback to be invoked when this view is clicked. If this view is not 3885 * clickable, it becomes clickable. 3886 * 3887 * @param l The callback that will run 3888 * 3889 * @see #setClickable(boolean) 3890 */ 3891 public void setOnClickListener(OnClickListener l) { 3892 if (!isClickable()) { 3893 setClickable(true); 3894 } 3895 getListenerInfo().mOnClickListener = l; 3896 } 3897 3898 /** 3899 * Return whether this view has an attached OnClickListener. Returns 3900 * true if there is a listener, false if there is none. 3901 */ 3902 public boolean hasOnClickListeners() { 3903 ListenerInfo li = mListenerInfo; 3904 return (li != null && li.mOnClickListener != null); 3905 } 3906 3907 /** 3908 * Register a callback to be invoked when this view is clicked and held. If this view is not 3909 * long clickable, it becomes long clickable. 3910 * 3911 * @param l The callback that will run 3912 * 3913 * @see #setLongClickable(boolean) 3914 */ 3915 public void setOnLongClickListener(OnLongClickListener l) { 3916 if (!isLongClickable()) { 3917 setLongClickable(true); 3918 } 3919 getListenerInfo().mOnLongClickListener = l; 3920 } 3921 3922 /** 3923 * Register a callback to be invoked when the context menu for this view is 3924 * being built. If this view is not long clickable, it becomes long clickable. 3925 * 3926 * @param l The callback that will run 3927 * 3928 */ 3929 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3930 if (!isLongClickable()) { 3931 setLongClickable(true); 3932 } 3933 getListenerInfo().mOnCreateContextMenuListener = l; 3934 } 3935 3936 /** 3937 * Call this view's OnClickListener, if it is defined. Performs all normal 3938 * actions associated with clicking: reporting accessibility event, playing 3939 * a sound, etc. 3940 * 3941 * @return True there was an assigned OnClickListener that was called, false 3942 * otherwise is returned. 3943 */ 3944 public boolean performClick() { 3945 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3946 3947 ListenerInfo li = mListenerInfo; 3948 if (li != null && li.mOnClickListener != null) { 3949 playSoundEffect(SoundEffectConstants.CLICK); 3950 li.mOnClickListener.onClick(this); 3951 return true; 3952 } 3953 3954 return false; 3955 } 3956 3957 /** 3958 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3959 * this only calls the listener, and does not do any associated clicking 3960 * actions like reporting an accessibility event. 3961 * 3962 * @return True there was an assigned OnClickListener that was called, false 3963 * otherwise is returned. 3964 */ 3965 public boolean callOnClick() { 3966 ListenerInfo li = mListenerInfo; 3967 if (li != null && li.mOnClickListener != null) { 3968 li.mOnClickListener.onClick(this); 3969 return true; 3970 } 3971 return false; 3972 } 3973 3974 /** 3975 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3976 * OnLongClickListener did not consume the event. 3977 * 3978 * @return True if one of the above receivers consumed the event, false otherwise. 3979 */ 3980 public boolean performLongClick() { 3981 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3982 3983 boolean handled = false; 3984 ListenerInfo li = mListenerInfo; 3985 if (li != null && li.mOnLongClickListener != null) { 3986 handled = li.mOnLongClickListener.onLongClick(View.this); 3987 } 3988 if (!handled) { 3989 handled = showContextMenu(); 3990 } 3991 if (handled) { 3992 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3993 } 3994 return handled; 3995 } 3996 3997 /** 3998 * Performs button-related actions during a touch down event. 3999 * 4000 * @param event The event. 4001 * @return True if the down was consumed. 4002 * 4003 * @hide 4004 */ 4005 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4006 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4007 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4008 return true; 4009 } 4010 } 4011 return false; 4012 } 4013 4014 /** 4015 * Bring up the context menu for this view. 4016 * 4017 * @return Whether a context menu was displayed. 4018 */ 4019 public boolean showContextMenu() { 4020 return getParent().showContextMenuForChild(this); 4021 } 4022 4023 /** 4024 * Bring up the context menu for this view, referring to the item under the specified point. 4025 * 4026 * @param x The referenced x coordinate. 4027 * @param y The referenced y coordinate. 4028 * @param metaState The keyboard modifiers that were pressed. 4029 * @return Whether a context menu was displayed. 4030 * 4031 * @hide 4032 */ 4033 public boolean showContextMenu(float x, float y, int metaState) { 4034 return showContextMenu(); 4035 } 4036 4037 /** 4038 * Start an action mode. 4039 * 4040 * @param callback Callback that will control the lifecycle of the action mode 4041 * @return The new action mode if it is started, null otherwise 4042 * 4043 * @see ActionMode 4044 */ 4045 public ActionMode startActionMode(ActionMode.Callback callback) { 4046 ViewParent parent = getParent(); 4047 if (parent == null) return null; 4048 return parent.startActionModeForChild(this, callback); 4049 } 4050 4051 /** 4052 * Register a callback to be invoked when a key is pressed in this view. 4053 * @param l the key listener to attach to this view 4054 */ 4055 public void setOnKeyListener(OnKeyListener l) { 4056 getListenerInfo().mOnKeyListener = l; 4057 } 4058 4059 /** 4060 * Register a callback to be invoked when a touch event is sent to this view. 4061 * @param l the touch listener to attach to this view 4062 */ 4063 public void setOnTouchListener(OnTouchListener l) { 4064 getListenerInfo().mOnTouchListener = l; 4065 } 4066 4067 /** 4068 * Register a callback to be invoked when a generic motion event is sent to this view. 4069 * @param l the generic motion listener to attach to this view 4070 */ 4071 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4072 getListenerInfo().mOnGenericMotionListener = l; 4073 } 4074 4075 /** 4076 * Register a callback to be invoked when a hover event is sent to this view. 4077 * @param l the hover listener to attach to this view 4078 */ 4079 public void setOnHoverListener(OnHoverListener l) { 4080 getListenerInfo().mOnHoverListener = l; 4081 } 4082 4083 /** 4084 * Register a drag event listener callback object for this View. The parameter is 4085 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4086 * View, the system calls the 4087 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4088 * @param l An implementation of {@link android.view.View.OnDragListener}. 4089 */ 4090 public void setOnDragListener(OnDragListener l) { 4091 getListenerInfo().mOnDragListener = l; 4092 } 4093 4094 /** 4095 * Give this view focus. This will cause 4096 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4097 * 4098 * Note: this does not check whether this {@link View} should get focus, it just 4099 * gives it focus no matter what. It should only be called internally by framework 4100 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4101 * 4102 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4103 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4104 * focus moved when requestFocus() is called. It may not always 4105 * apply, in which case use the default View.FOCUS_DOWN. 4106 * @param previouslyFocusedRect The rectangle of the view that had focus 4107 * prior in this View's coordinate system. 4108 */ 4109 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4110 if (DBG) { 4111 System.out.println(this + " requestFocus()"); 4112 } 4113 4114 if ((mPrivateFlags & FOCUSED) == 0) { 4115 mPrivateFlags |= FOCUSED; 4116 4117 if (mParent != null) { 4118 mParent.requestChildFocus(this, this); 4119 } 4120 4121 onFocusChanged(true, direction, previouslyFocusedRect); 4122 refreshDrawableState(); 4123 4124 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4125 notifyAccessibilityStateChanged(); 4126 } 4127 } 4128 } 4129 4130 /** 4131 * Request that a rectangle of this view be visible on the screen, 4132 * scrolling if necessary just enough. 4133 * 4134 * <p>A View should call this if it maintains some notion of which part 4135 * of its content is interesting. For example, a text editing view 4136 * should call this when its cursor moves. 4137 * 4138 * @param rectangle The rectangle. 4139 * @return Whether any parent scrolled. 4140 */ 4141 public boolean requestRectangleOnScreen(Rect rectangle) { 4142 return requestRectangleOnScreen(rectangle, false); 4143 } 4144 4145 /** 4146 * Request that a rectangle of this view be visible on the screen, 4147 * scrolling if necessary just enough. 4148 * 4149 * <p>A View should call this if it maintains some notion of which part 4150 * of its content is interesting. For example, a text editing view 4151 * should call this when its cursor moves. 4152 * 4153 * <p>When <code>immediate</code> is set to true, scrolling will not be 4154 * animated. 4155 * 4156 * @param rectangle The rectangle. 4157 * @param immediate True to forbid animated scrolling, false otherwise 4158 * @return Whether any parent scrolled. 4159 */ 4160 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4161 View child = this; 4162 ViewParent parent = mParent; 4163 boolean scrolled = false; 4164 while (parent != null) { 4165 scrolled |= parent.requestChildRectangleOnScreen(child, 4166 rectangle, immediate); 4167 4168 // offset rect so next call has the rectangle in the 4169 // coordinate system of its direct child. 4170 rectangle.offset(child.getLeft(), child.getTop()); 4171 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4172 4173 if (!(parent instanceof View)) { 4174 break; 4175 } 4176 4177 child = (View) parent; 4178 parent = child.getParent(); 4179 } 4180 return scrolled; 4181 } 4182 4183 /** 4184 * Called when this view wants to give up focus. If focus is cleared 4185 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4186 * <p> 4187 * <strong>Note:</strong> When a View clears focus the framework is trying 4188 * to give focus to the first focusable View from the top. Hence, if this 4189 * View is the first from the top that can take focus, then all callbacks 4190 * related to clearing focus will be invoked after wich the framework will 4191 * give focus to this view. 4192 * </p> 4193 */ 4194 public void clearFocus() { 4195 if (DBG) { 4196 System.out.println(this + " clearFocus()"); 4197 } 4198 4199 if ((mPrivateFlags & FOCUSED) != 0) { 4200 mPrivateFlags &= ~FOCUSED; 4201 4202 if (mParent != null) { 4203 mParent.clearChildFocus(this); 4204 } 4205 4206 onFocusChanged(false, 0, null); 4207 4208 refreshDrawableState(); 4209 4210 ensureInputFocusOnFirstFocusable(); 4211 4212 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4213 notifyAccessibilityStateChanged(); 4214 } 4215 } 4216 } 4217 4218 void ensureInputFocusOnFirstFocusable() { 4219 View root = getRootView(); 4220 if (root != null) { 4221 root.requestFocus(); 4222 } 4223 } 4224 4225 /** 4226 * Called internally by the view system when a new view is getting focus. 4227 * This is what clears the old focus. 4228 */ 4229 void unFocus() { 4230 if (DBG) { 4231 System.out.println(this + " unFocus()"); 4232 } 4233 4234 if ((mPrivateFlags & FOCUSED) != 0) { 4235 mPrivateFlags &= ~FOCUSED; 4236 4237 onFocusChanged(false, 0, null); 4238 refreshDrawableState(); 4239 4240 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4241 notifyAccessibilityStateChanged(); 4242 } 4243 } 4244 } 4245 4246 /** 4247 * Returns true if this view has focus iteself, or is the ancestor of the 4248 * view that has focus. 4249 * 4250 * @return True if this view has or contains focus, false otherwise. 4251 */ 4252 @ViewDebug.ExportedProperty(category = "focus") 4253 public boolean hasFocus() { 4254 return (mPrivateFlags & FOCUSED) != 0; 4255 } 4256 4257 /** 4258 * Returns true if this view is focusable or if it contains a reachable View 4259 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4260 * is a View whose parents do not block descendants focus. 4261 * 4262 * Only {@link #VISIBLE} views are considered focusable. 4263 * 4264 * @return True if the view is focusable or if the view contains a focusable 4265 * View, false otherwise. 4266 * 4267 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4268 */ 4269 public boolean hasFocusable() { 4270 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4271 } 4272 4273 /** 4274 * Called by the view system when the focus state of this view changes. 4275 * When the focus change event is caused by directional navigation, direction 4276 * and previouslyFocusedRect provide insight into where the focus is coming from. 4277 * When overriding, be sure to call up through to the super class so that 4278 * the standard focus handling will occur. 4279 * 4280 * @param gainFocus True if the View has focus; false otherwise. 4281 * @param direction The direction focus has moved when requestFocus() 4282 * is called to give this view focus. Values are 4283 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4284 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4285 * It may not always apply, in which case use the default. 4286 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4287 * system, of the previously focused view. If applicable, this will be 4288 * passed in as finer grained information about where the focus is coming 4289 * from (in addition to direction). Will be <code>null</code> otherwise. 4290 */ 4291 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4292 if (gainFocus) { 4293 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4294 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4295 requestAccessibilityFocus(); 4296 } 4297 } 4298 4299 InputMethodManager imm = InputMethodManager.peekInstance(); 4300 if (!gainFocus) { 4301 if (isPressed()) { 4302 setPressed(false); 4303 } 4304 if (imm != null && mAttachInfo != null 4305 && mAttachInfo.mHasWindowFocus) { 4306 imm.focusOut(this); 4307 } 4308 onFocusLost(); 4309 } else if (imm != null && mAttachInfo != null 4310 && mAttachInfo.mHasWindowFocus) { 4311 imm.focusIn(this); 4312 } 4313 4314 invalidate(true); 4315 ListenerInfo li = mListenerInfo; 4316 if (li != null && li.mOnFocusChangeListener != null) { 4317 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4318 } 4319 4320 if (mAttachInfo != null) { 4321 mAttachInfo.mKeyDispatchState.reset(this); 4322 } 4323 } 4324 4325 /** 4326 * Sends an accessibility event of the given type. If accessiiblity is 4327 * not enabled this method has no effect. The default implementation calls 4328 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4329 * to populate information about the event source (this View), then calls 4330 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4331 * populate the text content of the event source including its descendants, 4332 * and last calls 4333 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4334 * on its parent to resuest sending of the event to interested parties. 4335 * <p> 4336 * If an {@link AccessibilityDelegate} has been specified via calling 4337 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4338 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4339 * responsible for handling this call. 4340 * </p> 4341 * 4342 * @param eventType The type of the event to send, as defined by several types from 4343 * {@link android.view.accessibility.AccessibilityEvent}, such as 4344 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4345 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4346 * 4347 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4348 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4349 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4350 * @see AccessibilityDelegate 4351 */ 4352 public void sendAccessibilityEvent(int eventType) { 4353 if (mAccessibilityDelegate != null) { 4354 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4355 } else { 4356 sendAccessibilityEventInternal(eventType); 4357 } 4358 } 4359 4360 /** 4361 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4362 * {@link AccessibilityEvent} to make an announcement which is related to some 4363 * sort of a context change for which none of the events representing UI transitions 4364 * is a good fit. For example, announcing a new page in a book. If accessibility 4365 * is not enabled this method does nothing. 4366 * 4367 * @param text The announcement text. 4368 */ 4369 public void announceForAccessibility(CharSequence text) { 4370 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4371 AccessibilityEvent event = AccessibilityEvent.obtain( 4372 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4373 event.getText().add(text); 4374 sendAccessibilityEventUnchecked(event); 4375 } 4376 } 4377 4378 /** 4379 * @see #sendAccessibilityEvent(int) 4380 * 4381 * Note: Called from the default {@link AccessibilityDelegate}. 4382 */ 4383 void sendAccessibilityEventInternal(int eventType) { 4384 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4385 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4386 } 4387 } 4388 4389 /** 4390 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4391 * takes as an argument an empty {@link AccessibilityEvent} and does not 4392 * perform a check whether accessibility is enabled. 4393 * <p> 4394 * If an {@link AccessibilityDelegate} has been specified via calling 4395 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4396 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4397 * is responsible for handling this call. 4398 * </p> 4399 * 4400 * @param event The event to send. 4401 * 4402 * @see #sendAccessibilityEvent(int) 4403 */ 4404 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4405 if (mAccessibilityDelegate != null) { 4406 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4407 } else { 4408 sendAccessibilityEventUncheckedInternal(event); 4409 } 4410 } 4411 4412 /** 4413 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4414 * 4415 * Note: Called from the default {@link AccessibilityDelegate}. 4416 */ 4417 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4418 if (!isShown()) { 4419 return; 4420 } 4421 onInitializeAccessibilityEvent(event); 4422 // Only a subset of accessibility events populates text content. 4423 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4424 dispatchPopulateAccessibilityEvent(event); 4425 } 4426 // Intercept accessibility focus events fired by virtual nodes to keep 4427 // track of accessibility focus position in such nodes. 4428 final int eventType = event.getEventType(); 4429 switch (eventType) { 4430 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4431 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4432 event.getSourceNodeId()); 4433 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4434 ViewRootImpl viewRootImpl = getViewRootImpl(); 4435 if (viewRootImpl != null) { 4436 viewRootImpl.setAccessibilityFocusedHost(this); 4437 } 4438 } 4439 } break; 4440 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4441 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4442 event.getSourceNodeId()); 4443 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4444 ViewRootImpl viewRootImpl = getViewRootImpl(); 4445 if (viewRootImpl != null) { 4446 viewRootImpl.setAccessibilityFocusedHost(null); 4447 } 4448 } 4449 } break; 4450 } 4451 // In the beginning we called #isShown(), so we know that getParent() is not null. 4452 getParent().requestSendAccessibilityEvent(this, event); 4453 } 4454 4455 /** 4456 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4457 * to its children for adding their text content to the event. Note that the 4458 * event text is populated in a separate dispatch path since we add to the 4459 * event not only the text of the source but also the text of all its descendants. 4460 * A typical implementation will call 4461 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4462 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4463 * on each child. Override this method if custom population of the event text 4464 * content is required. 4465 * <p> 4466 * If an {@link AccessibilityDelegate} has been specified via calling 4467 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4468 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4469 * is responsible for handling this call. 4470 * </p> 4471 * <p> 4472 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4473 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4474 * </p> 4475 * 4476 * @param event The event. 4477 * 4478 * @return True if the event population was completed. 4479 */ 4480 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4481 if (mAccessibilityDelegate != null) { 4482 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4483 } else { 4484 return dispatchPopulateAccessibilityEventInternal(event); 4485 } 4486 } 4487 4488 /** 4489 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4490 * 4491 * Note: Called from the default {@link AccessibilityDelegate}. 4492 */ 4493 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4494 onPopulateAccessibilityEvent(event); 4495 return false; 4496 } 4497 4498 /** 4499 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4500 * giving a chance to this View to populate the accessibility event with its 4501 * text content. While this method is free to modify event 4502 * attributes other than text content, doing so should normally be performed in 4503 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4504 * <p> 4505 * Example: Adding formatted date string to an accessibility event in addition 4506 * to the text added by the super implementation: 4507 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4508 * super.onPopulateAccessibilityEvent(event); 4509 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4510 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4511 * mCurrentDate.getTimeInMillis(), flags); 4512 * event.getText().add(selectedDateUtterance); 4513 * }</pre> 4514 * <p> 4515 * If an {@link AccessibilityDelegate} has been specified via calling 4516 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4517 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4518 * is responsible for handling this call. 4519 * </p> 4520 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4521 * information to the event, in case the default implementation has basic information to add. 4522 * </p> 4523 * 4524 * @param event The accessibility event which to populate. 4525 * 4526 * @see #sendAccessibilityEvent(int) 4527 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4528 */ 4529 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4530 if (mAccessibilityDelegate != null) { 4531 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4532 } else { 4533 onPopulateAccessibilityEventInternal(event); 4534 } 4535 } 4536 4537 /** 4538 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4539 * 4540 * Note: Called from the default {@link AccessibilityDelegate}. 4541 */ 4542 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4543 4544 } 4545 4546 /** 4547 * Initializes an {@link AccessibilityEvent} with information about 4548 * this View which is the event source. In other words, the source of 4549 * an accessibility event is the view whose state change triggered firing 4550 * the event. 4551 * <p> 4552 * Example: Setting the password property of an event in addition 4553 * to properties set by the super implementation: 4554 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4555 * super.onInitializeAccessibilityEvent(event); 4556 * event.setPassword(true); 4557 * }</pre> 4558 * <p> 4559 * If an {@link AccessibilityDelegate} has been specified via calling 4560 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4561 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4562 * is responsible for handling this call. 4563 * </p> 4564 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4565 * information to the event, in case the default implementation has basic information to add. 4566 * </p> 4567 * @param event The event to initialize. 4568 * 4569 * @see #sendAccessibilityEvent(int) 4570 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4571 */ 4572 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4573 if (mAccessibilityDelegate != null) { 4574 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4575 } else { 4576 onInitializeAccessibilityEventInternal(event); 4577 } 4578 } 4579 4580 /** 4581 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4582 * 4583 * Note: Called from the default {@link AccessibilityDelegate}. 4584 */ 4585 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4586 event.setSource(this); 4587 event.setClassName(View.class.getName()); 4588 event.setPackageName(getContext().getPackageName()); 4589 event.setEnabled(isEnabled()); 4590 event.setContentDescription(mContentDescription); 4591 4592 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4593 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4594 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4595 FOCUSABLES_ALL); 4596 event.setItemCount(focusablesTempList.size()); 4597 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4598 focusablesTempList.clear(); 4599 } 4600 } 4601 4602 /** 4603 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4604 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4605 * This method is responsible for obtaining an accessibility node info from a 4606 * pool of reusable instances and calling 4607 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4608 * initialize the former. 4609 * <p> 4610 * Note: The client is responsible for recycling the obtained instance by calling 4611 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4612 * </p> 4613 * 4614 * @return A populated {@link AccessibilityNodeInfo}. 4615 * 4616 * @see AccessibilityNodeInfo 4617 */ 4618 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4619 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4620 if (provider != null) { 4621 return provider.createAccessibilityNodeInfo(View.NO_ID); 4622 } else { 4623 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4624 onInitializeAccessibilityNodeInfo(info); 4625 return info; 4626 } 4627 } 4628 4629 /** 4630 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4631 * The base implementation sets: 4632 * <ul> 4633 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4634 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4635 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4636 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4637 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4638 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4639 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4640 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4641 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4642 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4643 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4644 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4645 * </ul> 4646 * <p> 4647 * Subclasses should override this method, call the super implementation, 4648 * and set additional attributes. 4649 * </p> 4650 * <p> 4651 * If an {@link AccessibilityDelegate} has been specified via calling 4652 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4653 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4654 * is responsible for handling this call. 4655 * </p> 4656 * 4657 * @param info The instance to initialize. 4658 */ 4659 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4660 if (mAccessibilityDelegate != null) { 4661 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4662 } else { 4663 onInitializeAccessibilityNodeInfoInternal(info); 4664 } 4665 } 4666 4667 /** 4668 * Gets the location of this view in screen coordintates. 4669 * 4670 * @param outRect The output location 4671 */ 4672 private void getBoundsOnScreen(Rect outRect) { 4673 if (mAttachInfo == null) { 4674 return; 4675 } 4676 4677 RectF position = mAttachInfo.mTmpTransformRect; 4678 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4679 4680 if (!hasIdentityMatrix()) { 4681 getMatrix().mapRect(position); 4682 } 4683 4684 position.offset(mLeft, mTop); 4685 4686 ViewParent parent = mParent; 4687 while (parent instanceof View) { 4688 View parentView = (View) parent; 4689 4690 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4691 4692 if (!parentView.hasIdentityMatrix()) { 4693 parentView.getMatrix().mapRect(position); 4694 } 4695 4696 position.offset(parentView.mLeft, parentView.mTop); 4697 4698 parent = parentView.mParent; 4699 } 4700 4701 if (parent instanceof ViewRootImpl) { 4702 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4703 position.offset(0, -viewRootImpl.mCurScrollY); 4704 } 4705 4706 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4707 4708 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4709 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4710 } 4711 4712 /** 4713 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4714 * 4715 * Note: Called from the default {@link AccessibilityDelegate}. 4716 */ 4717 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4718 Rect bounds = mAttachInfo.mTmpInvalRect; 4719 getDrawingRect(bounds); 4720 info.setBoundsInParent(bounds); 4721 4722 getBoundsOnScreen(bounds); 4723 info.setBoundsInScreen(bounds); 4724 4725 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4726 ViewParent parent = getParentForAccessibility(); 4727 if (parent instanceof View) { 4728 info.setParent((View) parent); 4729 } 4730 } 4731 4732 info.setVisibleToUser(isVisibleToUser()); 4733 4734 info.setPackageName(mContext.getPackageName()); 4735 info.setClassName(View.class.getName()); 4736 info.setContentDescription(getContentDescription()); 4737 4738 info.setEnabled(isEnabled()); 4739 info.setClickable(isClickable()); 4740 info.setFocusable(isFocusable()); 4741 info.setFocused(isFocused()); 4742 info.setAccessibilityFocused(isAccessibilityFocused()); 4743 info.setSelected(isSelected()); 4744 info.setLongClickable(isLongClickable()); 4745 4746 // TODO: These make sense only if we are in an AdapterView but all 4747 // views can be selected. Maybe from accessiiblity perspective 4748 // we should report as selectable view in an AdapterView. 4749 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4750 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4751 4752 if (isFocusable()) { 4753 if (isFocused()) { 4754 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4755 } else { 4756 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4757 } 4758 } 4759 4760 if (!isAccessibilityFocused()) { 4761 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4762 } else { 4763 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4764 } 4765 4766 if (isClickable()) { 4767 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4768 } 4769 4770 if (isLongClickable()) { 4771 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4772 } 4773 4774 if (mContentDescription != null && mContentDescription.length() > 0) { 4775 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4776 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4777 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4778 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4779 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4780 } 4781 } 4782 4783 /** 4784 * Computes whether this view is visible to the user. Such a view is 4785 * attached, visible, all its predecessors are visible, it is not clipped 4786 * entirely by its predecessors, and has an alpha greater than zero. 4787 * 4788 * @return Whether the view is visible on the screen. 4789 * 4790 * @hide 4791 */ 4792 protected boolean isVisibleToUser() { 4793 return isVisibleToUser(null); 4794 } 4795 4796 /** 4797 * Computes whether the given portion of this view is visible to the user. Such a view is 4798 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4799 * the specified portion is not clipped entirely by its predecessors. 4800 * 4801 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4802 * <code>null</code>, and the entire view will be tested in this case. 4803 * When <code>true</code> is returned by the function, the actual visible 4804 * region will be stored in this parameter; that is, if boundInView is fully 4805 * contained within the view, no modification will be made, otherwise regions 4806 * outside of the visible area of the view will be clipped. 4807 * 4808 * @return Whether the specified portion of the view is visible on the screen. 4809 * 4810 * @hide 4811 */ 4812 protected boolean isVisibleToUser(Rect boundInView) { 4813 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4814 Point offset = mAttachInfo.mPoint; 4815 // The first two checks are made also made by isShown() which 4816 // however traverses the tree up to the parent to catch that. 4817 // Therefore, we do some fail fast check to minimize the up 4818 // tree traversal. 4819 boolean isVisible = mAttachInfo != null 4820 && mAttachInfo.mWindowVisibility == View.VISIBLE 4821 && getAlpha() > 0 4822 && isShown() 4823 && getGlobalVisibleRect(visibleRect, offset); 4824 if (isVisible && boundInView != null) { 4825 visibleRect.offset(-offset.x, -offset.y); 4826 isVisible &= boundInView.intersect(visibleRect); 4827 } 4828 return isVisible; 4829 } 4830 4831 /** 4832 * Sets a delegate for implementing accessibility support via compositon as 4833 * opposed to inheritance. The delegate's primary use is for implementing 4834 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4835 * 4836 * @param delegate The delegate instance. 4837 * 4838 * @see AccessibilityDelegate 4839 */ 4840 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4841 mAccessibilityDelegate = delegate; 4842 } 4843 4844 /** 4845 * Gets the provider for managing a virtual view hierarchy rooted at this View 4846 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4847 * that explore the window content. 4848 * <p> 4849 * If this method returns an instance, this instance is responsible for managing 4850 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4851 * View including the one representing the View itself. Similarly the returned 4852 * instance is responsible for performing accessibility actions on any virtual 4853 * view or the root view itself. 4854 * </p> 4855 * <p> 4856 * If an {@link AccessibilityDelegate} has been specified via calling 4857 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4858 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4859 * is responsible for handling this call. 4860 * </p> 4861 * 4862 * @return The provider. 4863 * 4864 * @see AccessibilityNodeProvider 4865 */ 4866 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4867 if (mAccessibilityDelegate != null) { 4868 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4869 } else { 4870 return null; 4871 } 4872 } 4873 4874 /** 4875 * Gets the unique identifier of this view on the screen for accessibility purposes. 4876 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4877 * 4878 * @return The view accessibility id. 4879 * 4880 * @hide 4881 */ 4882 public int getAccessibilityViewId() { 4883 if (mAccessibilityViewId == NO_ID) { 4884 mAccessibilityViewId = sNextAccessibilityViewId++; 4885 } 4886 return mAccessibilityViewId; 4887 } 4888 4889 /** 4890 * Gets the unique identifier of the window in which this View reseides. 4891 * 4892 * @return The window accessibility id. 4893 * 4894 * @hide 4895 */ 4896 public int getAccessibilityWindowId() { 4897 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4898 } 4899 4900 /** 4901 * Gets the {@link View} description. It briefly describes the view and is 4902 * primarily used for accessibility support. Set this property to enable 4903 * better accessibility support for your application. This is especially 4904 * true for views that do not have textual representation (For example, 4905 * ImageButton). 4906 * 4907 * @return The content description. 4908 * 4909 * @attr ref android.R.styleable#View_contentDescription 4910 */ 4911 @ViewDebug.ExportedProperty(category = "accessibility") 4912 public CharSequence getContentDescription() { 4913 return mContentDescription; 4914 } 4915 4916 /** 4917 * Sets the {@link View} description. It briefly describes the view and is 4918 * primarily used for accessibility support. Set this property to enable 4919 * better accessibility support for your application. This is especially 4920 * true for views that do not have textual representation (For example, 4921 * ImageButton). 4922 * 4923 * @param contentDescription The content description. 4924 * 4925 * @attr ref android.R.styleable#View_contentDescription 4926 */ 4927 @RemotableViewMethod 4928 public void setContentDescription(CharSequence contentDescription) { 4929 mContentDescription = contentDescription; 4930 } 4931 4932 /** 4933 * Invoked whenever this view loses focus, either by losing window focus or by losing 4934 * focus within its window. This method can be used to clear any state tied to the 4935 * focus. For instance, if a button is held pressed with the trackball and the window 4936 * loses focus, this method can be used to cancel the press. 4937 * 4938 * Subclasses of View overriding this method should always call super.onFocusLost(). 4939 * 4940 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4941 * @see #onWindowFocusChanged(boolean) 4942 * 4943 * @hide pending API council approval 4944 */ 4945 protected void onFocusLost() { 4946 resetPressedState(); 4947 } 4948 4949 private void resetPressedState() { 4950 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4951 return; 4952 } 4953 4954 if (isPressed()) { 4955 setPressed(false); 4956 4957 if (!mHasPerformedLongPress) { 4958 removeLongPressCallback(); 4959 } 4960 } 4961 } 4962 4963 /** 4964 * Returns true if this view has focus 4965 * 4966 * @return True if this view has focus, false otherwise. 4967 */ 4968 @ViewDebug.ExportedProperty(category = "focus") 4969 public boolean isFocused() { 4970 return (mPrivateFlags & FOCUSED) != 0; 4971 } 4972 4973 /** 4974 * Find the view in the hierarchy rooted at this view that currently has 4975 * focus. 4976 * 4977 * @return The view that currently has focus, or null if no focused view can 4978 * be found. 4979 */ 4980 public View findFocus() { 4981 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4982 } 4983 4984 /** 4985 * Indicates whether this view is one of the set of scrollable containers in 4986 * its window. 4987 * 4988 * @return whether this view is one of the set of scrollable containers in 4989 * its window 4990 * 4991 * @attr ref android.R.styleable#View_isScrollContainer 4992 */ 4993 public boolean isScrollContainer() { 4994 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4995 } 4996 4997 /** 4998 * Change whether this view is one of the set of scrollable containers in 4999 * its window. This will be used to determine whether the window can 5000 * resize or must pan when a soft input area is open -- scrollable 5001 * containers allow the window to use resize mode since the container 5002 * will appropriately shrink. 5003 * 5004 * @attr ref android.R.styleable#View_isScrollContainer 5005 */ 5006 public void setScrollContainer(boolean isScrollContainer) { 5007 if (isScrollContainer) { 5008 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5009 mAttachInfo.mScrollContainers.add(this); 5010 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5011 } 5012 mPrivateFlags |= SCROLL_CONTAINER; 5013 } else { 5014 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5015 mAttachInfo.mScrollContainers.remove(this); 5016 } 5017 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5018 } 5019 } 5020 5021 /** 5022 * Returns the quality of the drawing cache. 5023 * 5024 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5025 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5026 * 5027 * @see #setDrawingCacheQuality(int) 5028 * @see #setDrawingCacheEnabled(boolean) 5029 * @see #isDrawingCacheEnabled() 5030 * 5031 * @attr ref android.R.styleable#View_drawingCacheQuality 5032 */ 5033 public int getDrawingCacheQuality() { 5034 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5035 } 5036 5037 /** 5038 * Set the drawing cache quality of this view. This value is used only when the 5039 * drawing cache is enabled 5040 * 5041 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5042 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5043 * 5044 * @see #getDrawingCacheQuality() 5045 * @see #setDrawingCacheEnabled(boolean) 5046 * @see #isDrawingCacheEnabled() 5047 * 5048 * @attr ref android.R.styleable#View_drawingCacheQuality 5049 */ 5050 public void setDrawingCacheQuality(int quality) { 5051 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5052 } 5053 5054 /** 5055 * Returns whether the screen should remain on, corresponding to the current 5056 * value of {@link #KEEP_SCREEN_ON}. 5057 * 5058 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5059 * 5060 * @see #setKeepScreenOn(boolean) 5061 * 5062 * @attr ref android.R.styleable#View_keepScreenOn 5063 */ 5064 public boolean getKeepScreenOn() { 5065 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5066 } 5067 5068 /** 5069 * Controls whether the screen should remain on, modifying the 5070 * value of {@link #KEEP_SCREEN_ON}. 5071 * 5072 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5073 * 5074 * @see #getKeepScreenOn() 5075 * 5076 * @attr ref android.R.styleable#View_keepScreenOn 5077 */ 5078 public void setKeepScreenOn(boolean keepScreenOn) { 5079 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5080 } 5081 5082 /** 5083 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5084 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5085 * 5086 * @attr ref android.R.styleable#View_nextFocusLeft 5087 */ 5088 public int getNextFocusLeftId() { 5089 return mNextFocusLeftId; 5090 } 5091 5092 /** 5093 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5094 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5095 * decide automatically. 5096 * 5097 * @attr ref android.R.styleable#View_nextFocusLeft 5098 */ 5099 public void setNextFocusLeftId(int nextFocusLeftId) { 5100 mNextFocusLeftId = nextFocusLeftId; 5101 } 5102 5103 /** 5104 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5105 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5106 * 5107 * @attr ref android.R.styleable#View_nextFocusRight 5108 */ 5109 public int getNextFocusRightId() { 5110 return mNextFocusRightId; 5111 } 5112 5113 /** 5114 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5115 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5116 * decide automatically. 5117 * 5118 * @attr ref android.R.styleable#View_nextFocusRight 5119 */ 5120 public void setNextFocusRightId(int nextFocusRightId) { 5121 mNextFocusRightId = nextFocusRightId; 5122 } 5123 5124 /** 5125 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5126 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5127 * 5128 * @attr ref android.R.styleable#View_nextFocusUp 5129 */ 5130 public int getNextFocusUpId() { 5131 return mNextFocusUpId; 5132 } 5133 5134 /** 5135 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5136 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5137 * decide automatically. 5138 * 5139 * @attr ref android.R.styleable#View_nextFocusUp 5140 */ 5141 public void setNextFocusUpId(int nextFocusUpId) { 5142 mNextFocusUpId = nextFocusUpId; 5143 } 5144 5145 /** 5146 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5147 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5148 * 5149 * @attr ref android.R.styleable#View_nextFocusDown 5150 */ 5151 public int getNextFocusDownId() { 5152 return mNextFocusDownId; 5153 } 5154 5155 /** 5156 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5157 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5158 * decide automatically. 5159 * 5160 * @attr ref android.R.styleable#View_nextFocusDown 5161 */ 5162 public void setNextFocusDownId(int nextFocusDownId) { 5163 mNextFocusDownId = nextFocusDownId; 5164 } 5165 5166 /** 5167 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5168 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5169 * 5170 * @attr ref android.R.styleable#View_nextFocusForward 5171 */ 5172 public int getNextFocusForwardId() { 5173 return mNextFocusForwardId; 5174 } 5175 5176 /** 5177 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5178 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5179 * decide automatically. 5180 * 5181 * @attr ref android.R.styleable#View_nextFocusForward 5182 */ 5183 public void setNextFocusForwardId(int nextFocusForwardId) { 5184 mNextFocusForwardId = nextFocusForwardId; 5185 } 5186 5187 /** 5188 * Returns the visibility of this view and all of its ancestors 5189 * 5190 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5191 */ 5192 public boolean isShown() { 5193 View current = this; 5194 //noinspection ConstantConditions 5195 do { 5196 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5197 return false; 5198 } 5199 ViewParent parent = current.mParent; 5200 if (parent == null) { 5201 return false; // We are not attached to the view root 5202 } 5203 if (!(parent instanceof View)) { 5204 return true; 5205 } 5206 current = (View) parent; 5207 } while (current != null); 5208 5209 return false; 5210 } 5211 5212 /** 5213 * Called by the view hierarchy when the content insets for a window have 5214 * changed, to allow it to adjust its content to fit within those windows. 5215 * The content insets tell you the space that the status bar, input method, 5216 * and other system windows infringe on the application's window. 5217 * 5218 * <p>You do not normally need to deal with this function, since the default 5219 * window decoration given to applications takes care of applying it to the 5220 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5221 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5222 * and your content can be placed under those system elements. You can then 5223 * use this method within your view hierarchy if you have parts of your UI 5224 * which you would like to ensure are not being covered. 5225 * 5226 * <p>The default implementation of this method simply applies the content 5227 * inset's to the view's padding. This can be enabled through 5228 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5229 * the method and handle the insets however you would like. Note that the 5230 * insets provided by the framework are always relative to the far edges 5231 * of the window, not accounting for the location of the called view within 5232 * that window. (In fact when this method is called you do not yet know 5233 * where the layout will place the view, as it is done before layout happens.) 5234 * 5235 * <p>Note: unlike many View methods, there is no dispatch phase to this 5236 * call. If you are overriding it in a ViewGroup and want to allow the 5237 * call to continue to your children, you must be sure to call the super 5238 * implementation. 5239 * 5240 * <p>Here is a sample layout that makes use of fitting system windows 5241 * to have controls for a video view placed inside of the window decorations 5242 * that it hides and shows. This can be used with code like the second 5243 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5244 * 5245 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5246 * 5247 * @param insets Current content insets of the window. Prior to 5248 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5249 * the insets or else you and Android will be unhappy. 5250 * 5251 * @return Return true if this view applied the insets and it should not 5252 * continue propagating further down the hierarchy, false otherwise. 5253 */ 5254 protected boolean fitSystemWindows(Rect insets) { 5255 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5256 mUserPaddingStart = -1; 5257 mUserPaddingEnd = -1; 5258 mUserPaddingRelative = false; 5259 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5260 || mAttachInfo == null 5261 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5262 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5263 return true; 5264 } else { 5265 internalSetPadding(0, 0, 0, 0); 5266 return false; 5267 } 5268 } 5269 return false; 5270 } 5271 5272 /** 5273 * Set whether or not this view should account for system screen decorations 5274 * such as the status bar and inset its content. This allows this view to be 5275 * positioned in absolute screen coordinates and remain visible to the user. 5276 * 5277 * <p>This should only be used by top-level window decor views. 5278 * 5279 * @param fitSystemWindows true to inset content for system screen decorations, false for 5280 * default behavior. 5281 * 5282 * @attr ref android.R.styleable#View_fitsSystemWindows 5283 */ 5284 public void setFitsSystemWindows(boolean fitSystemWindows) { 5285 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5286 } 5287 5288 /** 5289 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5290 * returns true, this view 5291 * will account for system screen decorations such as the status bar and inset its 5292 * content. This allows the view to be positioned in absolute screen coordinates 5293 * and remain visible to the user. 5294 * 5295 * @return true if this view will adjust its content bounds for system screen decorations. 5296 * 5297 * @attr ref android.R.styleable#View_fitsSystemWindows 5298 */ 5299 public boolean getFitsSystemWindows() { 5300 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5301 } 5302 5303 /** @hide */ 5304 public boolean fitsSystemWindows() { 5305 return getFitsSystemWindows(); 5306 } 5307 5308 /** 5309 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5310 */ 5311 public void requestFitSystemWindows() { 5312 if (mParent != null) { 5313 mParent.requestFitSystemWindows(); 5314 } 5315 } 5316 5317 /** 5318 * For use by PhoneWindow to make its own system window fitting optional. 5319 * @hide 5320 */ 5321 public void makeOptionalFitsSystemWindows() { 5322 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5323 } 5324 5325 /** 5326 * Returns the visibility status for this view. 5327 * 5328 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5329 * @attr ref android.R.styleable#View_visibility 5330 */ 5331 @ViewDebug.ExportedProperty(mapping = { 5332 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5333 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5334 @ViewDebug.IntToString(from = GONE, to = "GONE") 5335 }) 5336 public int getVisibility() { 5337 return mViewFlags & VISIBILITY_MASK; 5338 } 5339 5340 /** 5341 * Set the enabled state of this view. 5342 * 5343 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5344 * @attr ref android.R.styleable#View_visibility 5345 */ 5346 @RemotableViewMethod 5347 public void setVisibility(int visibility) { 5348 setFlags(visibility, VISIBILITY_MASK); 5349 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5350 } 5351 5352 /** 5353 * Returns the enabled status for this view. The interpretation of the 5354 * enabled state varies by subclass. 5355 * 5356 * @return True if this view is enabled, false otherwise. 5357 */ 5358 @ViewDebug.ExportedProperty 5359 public boolean isEnabled() { 5360 return (mViewFlags & ENABLED_MASK) == ENABLED; 5361 } 5362 5363 /** 5364 * Set the enabled state of this view. The interpretation of the enabled 5365 * state varies by subclass. 5366 * 5367 * @param enabled True if this view is enabled, false otherwise. 5368 */ 5369 @RemotableViewMethod 5370 public void setEnabled(boolean enabled) { 5371 if (enabled == isEnabled()) return; 5372 5373 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5374 5375 /* 5376 * The View most likely has to change its appearance, so refresh 5377 * the drawable state. 5378 */ 5379 refreshDrawableState(); 5380 5381 // Invalidate too, since the default behavior for views is to be 5382 // be drawn at 50% alpha rather than to change the drawable. 5383 invalidate(true); 5384 } 5385 5386 /** 5387 * Set whether this view can receive the focus. 5388 * 5389 * Setting this to false will also ensure that this view is not focusable 5390 * in touch mode. 5391 * 5392 * @param focusable If true, this view can receive the focus. 5393 * 5394 * @see #setFocusableInTouchMode(boolean) 5395 * @attr ref android.R.styleable#View_focusable 5396 */ 5397 public void setFocusable(boolean focusable) { 5398 if (!focusable) { 5399 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5400 } 5401 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5402 } 5403 5404 /** 5405 * Set whether this view can receive focus while in touch mode. 5406 * 5407 * Setting this to true will also ensure that this view is focusable. 5408 * 5409 * @param focusableInTouchMode If true, this view can receive the focus while 5410 * in touch mode. 5411 * 5412 * @see #setFocusable(boolean) 5413 * @attr ref android.R.styleable#View_focusableInTouchMode 5414 */ 5415 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5416 // Focusable in touch mode should always be set before the focusable flag 5417 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5418 // which, in touch mode, will not successfully request focus on this view 5419 // because the focusable in touch mode flag is not set 5420 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5421 if (focusableInTouchMode) { 5422 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5423 } 5424 } 5425 5426 /** 5427 * Set whether this view should have sound effects enabled for events such as 5428 * clicking and touching. 5429 * 5430 * <p>You may wish to disable sound effects for a view if you already play sounds, 5431 * for instance, a dial key that plays dtmf tones. 5432 * 5433 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5434 * @see #isSoundEffectsEnabled() 5435 * @see #playSoundEffect(int) 5436 * @attr ref android.R.styleable#View_soundEffectsEnabled 5437 */ 5438 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5439 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5440 } 5441 5442 /** 5443 * @return whether this view should have sound effects enabled for events such as 5444 * clicking and touching. 5445 * 5446 * @see #setSoundEffectsEnabled(boolean) 5447 * @see #playSoundEffect(int) 5448 * @attr ref android.R.styleable#View_soundEffectsEnabled 5449 */ 5450 @ViewDebug.ExportedProperty 5451 public boolean isSoundEffectsEnabled() { 5452 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5453 } 5454 5455 /** 5456 * Set whether this view should have haptic feedback for events such as 5457 * long presses. 5458 * 5459 * <p>You may wish to disable haptic feedback if your view already controls 5460 * its own haptic feedback. 5461 * 5462 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5463 * @see #isHapticFeedbackEnabled() 5464 * @see #performHapticFeedback(int) 5465 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5466 */ 5467 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5468 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5469 } 5470 5471 /** 5472 * @return whether this view should have haptic feedback enabled for events 5473 * long presses. 5474 * 5475 * @see #setHapticFeedbackEnabled(boolean) 5476 * @see #performHapticFeedback(int) 5477 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5478 */ 5479 @ViewDebug.ExportedProperty 5480 public boolean isHapticFeedbackEnabled() { 5481 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5482 } 5483 5484 /** 5485 * Returns the layout direction for this view. 5486 * 5487 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5488 * {@link #LAYOUT_DIRECTION_RTL}, 5489 * {@link #LAYOUT_DIRECTION_INHERIT} or 5490 * {@link #LAYOUT_DIRECTION_LOCALE}. 5491 * @attr ref android.R.styleable#View_layoutDirection 5492 */ 5493 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5494 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5495 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5496 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5497 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5498 }) 5499 public int getLayoutDirection() { 5500 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5501 } 5502 5503 /** 5504 * Set the layout direction for this view. This will propagate a reset of layout direction 5505 * resolution to the view's children and resolve layout direction for this view. 5506 * 5507 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5508 * {@link #LAYOUT_DIRECTION_RTL}, 5509 * {@link #LAYOUT_DIRECTION_INHERIT} or 5510 * {@link #LAYOUT_DIRECTION_LOCALE}. 5511 * 5512 * @attr ref android.R.styleable#View_layoutDirection 5513 */ 5514 @RemotableViewMethod 5515 public void setLayoutDirection(int layoutDirection) { 5516 if (getLayoutDirection() != layoutDirection) { 5517 // Reset the current layout direction and the resolved one 5518 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5519 resetResolvedLayoutDirection(); 5520 // Set the new layout direction (filtered) and ask for a layout pass 5521 mPrivateFlags2 |= 5522 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5523 requestLayout(); 5524 } 5525 } 5526 5527 /** 5528 * Returns the resolved layout direction for this view. 5529 * 5530 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5531 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5532 */ 5533 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5534 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5535 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5536 }) 5537 public int getResolvedLayoutDirection() { 5538 // The layout diretion will be resolved only if needed 5539 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5540 resolveLayoutDirection(); 5541 } 5542 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5543 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5544 } 5545 5546 /** 5547 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5548 * layout attribute and/or the inherited value from the parent 5549 * 5550 * @return true if the layout is right-to-left. 5551 */ 5552 @ViewDebug.ExportedProperty(category = "layout") 5553 public boolean isLayoutRtl() { 5554 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5555 } 5556 5557 /** 5558 * Indicates whether the view is currently tracking transient state that the 5559 * app should not need to concern itself with saving and restoring, but that 5560 * the framework should take special note to preserve when possible. 5561 * 5562 * <p>A view with transient state cannot be trivially rebound from an external 5563 * data source, such as an adapter binding item views in a list. This may be 5564 * because the view is performing an animation, tracking user selection 5565 * of content, or similar.</p> 5566 * 5567 * @return true if the view has transient state 5568 */ 5569 @ViewDebug.ExportedProperty(category = "layout") 5570 public boolean hasTransientState() { 5571 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5572 } 5573 5574 /** 5575 * Set whether this view is currently tracking transient state that the 5576 * framework should attempt to preserve when possible. This flag is reference counted, 5577 * so every call to setHasTransientState(true) should be paired with a later call 5578 * to setHasTransientState(false). 5579 * 5580 * <p>A view with transient state cannot be trivially rebound from an external 5581 * data source, such as an adapter binding item views in a list. This may be 5582 * because the view is performing an animation, tracking user selection 5583 * of content, or similar.</p> 5584 * 5585 * @param hasTransientState true if this view has transient state 5586 */ 5587 public void setHasTransientState(boolean hasTransientState) { 5588 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5589 mTransientStateCount - 1; 5590 if (mTransientStateCount < 0) { 5591 mTransientStateCount = 0; 5592 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5593 "unmatched pair of setHasTransientState calls"); 5594 } 5595 if ((hasTransientState && mTransientStateCount == 1) || 5596 (!hasTransientState && mTransientStateCount == 0)) { 5597 // update flag if we've just incremented up from 0 or decremented down to 0 5598 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5599 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5600 if (mParent != null) { 5601 try { 5602 mParent.childHasTransientStateChanged(this, hasTransientState); 5603 } catch (AbstractMethodError e) { 5604 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5605 " does not fully implement ViewParent", e); 5606 } 5607 } 5608 } 5609 } 5610 5611 /** 5612 * If this view doesn't do any drawing on its own, set this flag to 5613 * allow further optimizations. By default, this flag is not set on 5614 * View, but could be set on some View subclasses such as ViewGroup. 5615 * 5616 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5617 * you should clear this flag. 5618 * 5619 * @param willNotDraw whether or not this View draw on its own 5620 */ 5621 public void setWillNotDraw(boolean willNotDraw) { 5622 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5623 } 5624 5625 /** 5626 * Returns whether or not this View draws on its own. 5627 * 5628 * @return true if this view has nothing to draw, false otherwise 5629 */ 5630 @ViewDebug.ExportedProperty(category = "drawing") 5631 public boolean willNotDraw() { 5632 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5633 } 5634 5635 /** 5636 * When a View's drawing cache is enabled, drawing is redirected to an 5637 * offscreen bitmap. Some views, like an ImageView, must be able to 5638 * bypass this mechanism if they already draw a single bitmap, to avoid 5639 * unnecessary usage of the memory. 5640 * 5641 * @param willNotCacheDrawing true if this view does not cache its 5642 * drawing, false otherwise 5643 */ 5644 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5645 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5646 } 5647 5648 /** 5649 * Returns whether or not this View can cache its drawing or not. 5650 * 5651 * @return true if this view does not cache its drawing, false otherwise 5652 */ 5653 @ViewDebug.ExportedProperty(category = "drawing") 5654 public boolean willNotCacheDrawing() { 5655 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5656 } 5657 5658 /** 5659 * Indicates whether this view reacts to click events or not. 5660 * 5661 * @return true if the view is clickable, false otherwise 5662 * 5663 * @see #setClickable(boolean) 5664 * @attr ref android.R.styleable#View_clickable 5665 */ 5666 @ViewDebug.ExportedProperty 5667 public boolean isClickable() { 5668 return (mViewFlags & CLICKABLE) == CLICKABLE; 5669 } 5670 5671 /** 5672 * Enables or disables click events for this view. When a view 5673 * is clickable it will change its state to "pressed" on every click. 5674 * Subclasses should set the view clickable to visually react to 5675 * user's clicks. 5676 * 5677 * @param clickable true to make the view clickable, false otherwise 5678 * 5679 * @see #isClickable() 5680 * @attr ref android.R.styleable#View_clickable 5681 */ 5682 public void setClickable(boolean clickable) { 5683 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5684 } 5685 5686 /** 5687 * Indicates whether this view reacts to long click events or not. 5688 * 5689 * @return true if the view is long clickable, false otherwise 5690 * 5691 * @see #setLongClickable(boolean) 5692 * @attr ref android.R.styleable#View_longClickable 5693 */ 5694 public boolean isLongClickable() { 5695 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5696 } 5697 5698 /** 5699 * Enables or disables long click events for this view. When a view is long 5700 * clickable it reacts to the user holding down the button for a longer 5701 * duration than a tap. This event can either launch the listener or a 5702 * context menu. 5703 * 5704 * @param longClickable true to make the view long clickable, false otherwise 5705 * @see #isLongClickable() 5706 * @attr ref android.R.styleable#View_longClickable 5707 */ 5708 public void setLongClickable(boolean longClickable) { 5709 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5710 } 5711 5712 /** 5713 * Sets the pressed state for this view. 5714 * 5715 * @see #isClickable() 5716 * @see #setClickable(boolean) 5717 * 5718 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5719 * the View's internal state from a previously set "pressed" state. 5720 */ 5721 public void setPressed(boolean pressed) { 5722 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5723 5724 if (pressed) { 5725 mPrivateFlags |= PRESSED; 5726 } else { 5727 mPrivateFlags &= ~PRESSED; 5728 } 5729 5730 if (needsRefresh) { 5731 refreshDrawableState(); 5732 } 5733 dispatchSetPressed(pressed); 5734 } 5735 5736 /** 5737 * Dispatch setPressed to all of this View's children. 5738 * 5739 * @see #setPressed(boolean) 5740 * 5741 * @param pressed The new pressed state 5742 */ 5743 protected void dispatchSetPressed(boolean pressed) { 5744 } 5745 5746 /** 5747 * Indicates whether the view is currently in pressed state. Unless 5748 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5749 * the pressed state. 5750 * 5751 * @see #setPressed(boolean) 5752 * @see #isClickable() 5753 * @see #setClickable(boolean) 5754 * 5755 * @return true if the view is currently pressed, false otherwise 5756 */ 5757 public boolean isPressed() { 5758 return (mPrivateFlags & PRESSED) == PRESSED; 5759 } 5760 5761 /** 5762 * Indicates whether this view will save its state (that is, 5763 * whether its {@link #onSaveInstanceState} method will be called). 5764 * 5765 * @return Returns true if the view state saving is enabled, else false. 5766 * 5767 * @see #setSaveEnabled(boolean) 5768 * @attr ref android.R.styleable#View_saveEnabled 5769 */ 5770 public boolean isSaveEnabled() { 5771 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5772 } 5773 5774 /** 5775 * Controls whether the saving of this view's state is 5776 * enabled (that is, whether its {@link #onSaveInstanceState} method 5777 * will be called). Note that even if freezing is enabled, the 5778 * view still must have an id assigned to it (via {@link #setId(int)}) 5779 * for its state to be saved. This flag can only disable the 5780 * saving of this view; any child views may still have their state saved. 5781 * 5782 * @param enabled Set to false to <em>disable</em> state saving, or true 5783 * (the default) to allow it. 5784 * 5785 * @see #isSaveEnabled() 5786 * @see #setId(int) 5787 * @see #onSaveInstanceState() 5788 * @attr ref android.R.styleable#View_saveEnabled 5789 */ 5790 public void setSaveEnabled(boolean enabled) { 5791 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5792 } 5793 5794 /** 5795 * Gets whether the framework should discard touches when the view's 5796 * window is obscured by another visible window. 5797 * Refer to the {@link View} security documentation for more details. 5798 * 5799 * @return True if touch filtering is enabled. 5800 * 5801 * @see #setFilterTouchesWhenObscured(boolean) 5802 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5803 */ 5804 @ViewDebug.ExportedProperty 5805 public boolean getFilterTouchesWhenObscured() { 5806 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5807 } 5808 5809 /** 5810 * Sets whether the framework should discard touches when the view's 5811 * window is obscured by another visible window. 5812 * Refer to the {@link View} security documentation for more details. 5813 * 5814 * @param enabled True if touch filtering should be enabled. 5815 * 5816 * @see #getFilterTouchesWhenObscured 5817 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5818 */ 5819 public void setFilterTouchesWhenObscured(boolean enabled) { 5820 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5821 FILTER_TOUCHES_WHEN_OBSCURED); 5822 } 5823 5824 /** 5825 * Indicates whether the entire hierarchy under this view will save its 5826 * state when a state saving traversal occurs from its parent. The default 5827 * is true; if false, these views will not be saved unless 5828 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5829 * 5830 * @return Returns true if the view state saving from parent is enabled, else false. 5831 * 5832 * @see #setSaveFromParentEnabled(boolean) 5833 */ 5834 public boolean isSaveFromParentEnabled() { 5835 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5836 } 5837 5838 /** 5839 * Controls whether the entire hierarchy under this view will save its 5840 * state when a state saving traversal occurs from its parent. The default 5841 * is true; if false, these views will not be saved unless 5842 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5843 * 5844 * @param enabled Set to false to <em>disable</em> state saving, or true 5845 * (the default) to allow it. 5846 * 5847 * @see #isSaveFromParentEnabled() 5848 * @see #setId(int) 5849 * @see #onSaveInstanceState() 5850 */ 5851 public void setSaveFromParentEnabled(boolean enabled) { 5852 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5853 } 5854 5855 5856 /** 5857 * Returns whether this View is able to take focus. 5858 * 5859 * @return True if this view can take focus, or false otherwise. 5860 * @attr ref android.R.styleable#View_focusable 5861 */ 5862 @ViewDebug.ExportedProperty(category = "focus") 5863 public final boolean isFocusable() { 5864 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5865 } 5866 5867 /** 5868 * When a view is focusable, it may not want to take focus when in touch mode. 5869 * For example, a button would like focus when the user is navigating via a D-pad 5870 * so that the user can click on it, but once the user starts touching the screen, 5871 * the button shouldn't take focus 5872 * @return Whether the view is focusable in touch mode. 5873 * @attr ref android.R.styleable#View_focusableInTouchMode 5874 */ 5875 @ViewDebug.ExportedProperty 5876 public final boolean isFocusableInTouchMode() { 5877 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5878 } 5879 5880 /** 5881 * Find the nearest view in the specified direction that can take focus. 5882 * This does not actually give focus to that view. 5883 * 5884 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5885 * 5886 * @return The nearest focusable in the specified direction, or null if none 5887 * can be found. 5888 */ 5889 public View focusSearch(int direction) { 5890 if (mParent != null) { 5891 return mParent.focusSearch(this, direction); 5892 } else { 5893 return null; 5894 } 5895 } 5896 5897 /** 5898 * This method is the last chance for the focused view and its ancestors to 5899 * respond to an arrow key. This is called when the focused view did not 5900 * consume the key internally, nor could the view system find a new view in 5901 * the requested direction to give focus to. 5902 * 5903 * @param focused The currently focused view. 5904 * @param direction The direction focus wants to move. One of FOCUS_UP, 5905 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5906 * @return True if the this view consumed this unhandled move. 5907 */ 5908 public boolean dispatchUnhandledMove(View focused, int direction) { 5909 return false; 5910 } 5911 5912 /** 5913 * If a user manually specified the next view id for a particular direction, 5914 * use the root to look up the view. 5915 * @param root The root view of the hierarchy containing this view. 5916 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5917 * or FOCUS_BACKWARD. 5918 * @return The user specified next view, or null if there is none. 5919 */ 5920 View findUserSetNextFocus(View root, int direction) { 5921 switch (direction) { 5922 case FOCUS_LEFT: 5923 if (mNextFocusLeftId == View.NO_ID) return null; 5924 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5925 case FOCUS_RIGHT: 5926 if (mNextFocusRightId == View.NO_ID) return null; 5927 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5928 case FOCUS_UP: 5929 if (mNextFocusUpId == View.NO_ID) return null; 5930 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5931 case FOCUS_DOWN: 5932 if (mNextFocusDownId == View.NO_ID) return null; 5933 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5934 case FOCUS_FORWARD: 5935 if (mNextFocusForwardId == View.NO_ID) return null; 5936 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5937 case FOCUS_BACKWARD: { 5938 if (mID == View.NO_ID) return null; 5939 final int id = mID; 5940 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5941 @Override 5942 public boolean apply(View t) { 5943 return t.mNextFocusForwardId == id; 5944 } 5945 }); 5946 } 5947 } 5948 return null; 5949 } 5950 5951 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5952 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5953 @Override 5954 public boolean apply(View t) { 5955 return t.mID == childViewId; 5956 } 5957 }); 5958 5959 if (result == null) { 5960 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5961 + "by user for id " + childViewId); 5962 } 5963 return result; 5964 } 5965 5966 /** 5967 * Find and return all focusable views that are descendants of this view, 5968 * possibly including this view if it is focusable itself. 5969 * 5970 * @param direction The direction of the focus 5971 * @return A list of focusable views 5972 */ 5973 public ArrayList<View> getFocusables(int direction) { 5974 ArrayList<View> result = new ArrayList<View>(24); 5975 addFocusables(result, direction); 5976 return result; 5977 } 5978 5979 /** 5980 * Add any focusable views that are descendants of this view (possibly 5981 * including this view if it is focusable itself) to views. If we are in touch mode, 5982 * only add views that are also focusable in touch mode. 5983 * 5984 * @param views Focusable views found so far 5985 * @param direction The direction of the focus 5986 */ 5987 public void addFocusables(ArrayList<View> views, int direction) { 5988 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5989 } 5990 5991 /** 5992 * Adds any focusable views that are descendants of this view (possibly 5993 * including this view if it is focusable itself) to views. This method 5994 * adds all focusable views regardless if we are in touch mode or 5995 * only views focusable in touch mode if we are in touch mode or 5996 * only views that can take accessibility focus if accessibility is enabeld 5997 * depending on the focusable mode paramater. 5998 * 5999 * @param views Focusable views found so far or null if all we are interested is 6000 * the number of focusables. 6001 * @param direction The direction of the focus. 6002 * @param focusableMode The type of focusables to be added. 6003 * 6004 * @see #FOCUSABLES_ALL 6005 * @see #FOCUSABLES_TOUCH_MODE 6006 */ 6007 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6008 if (views == null) { 6009 return; 6010 } 6011 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6012 if (AccessibilityManager.getInstance(mContext).isEnabled() 6013 && includeForAccessibility()) { 6014 views.add(this); 6015 return; 6016 } 6017 } 6018 if (!isFocusable()) { 6019 return; 6020 } 6021 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6022 && isInTouchMode() && !isFocusableInTouchMode()) { 6023 return; 6024 } 6025 views.add(this); 6026 } 6027 6028 /** 6029 * Finds the Views that contain given text. The containment is case insensitive. 6030 * The search is performed by either the text that the View renders or the content 6031 * description that describes the view for accessibility purposes and the view does 6032 * not render or both. Clients can specify how the search is to be performed via 6033 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6034 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6035 * 6036 * @param outViews The output list of matching Views. 6037 * @param searched The text to match against. 6038 * 6039 * @see #FIND_VIEWS_WITH_TEXT 6040 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6041 * @see #setContentDescription(CharSequence) 6042 */ 6043 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6044 if (getAccessibilityNodeProvider() != null) { 6045 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6046 outViews.add(this); 6047 } 6048 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6049 && (searched != null && searched.length() > 0) 6050 && (mContentDescription != null && mContentDescription.length() > 0)) { 6051 String searchedLowerCase = searched.toString().toLowerCase(); 6052 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6053 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6054 outViews.add(this); 6055 } 6056 } 6057 } 6058 6059 /** 6060 * Find and return all touchable views that are descendants of this view, 6061 * possibly including this view if it is touchable itself. 6062 * 6063 * @return A list of touchable views 6064 */ 6065 public ArrayList<View> getTouchables() { 6066 ArrayList<View> result = new ArrayList<View>(); 6067 addTouchables(result); 6068 return result; 6069 } 6070 6071 /** 6072 * Add any touchable views that are descendants of this view (possibly 6073 * including this view if it is touchable itself) to views. 6074 * 6075 * @param views Touchable views found so far 6076 */ 6077 public void addTouchables(ArrayList<View> views) { 6078 final int viewFlags = mViewFlags; 6079 6080 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6081 && (viewFlags & ENABLED_MASK) == ENABLED) { 6082 views.add(this); 6083 } 6084 } 6085 6086 /** 6087 * Returns whether this View is accessibility focused. 6088 * 6089 * @return True if this View is accessibility focused. 6090 */ 6091 boolean isAccessibilityFocused() { 6092 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6093 } 6094 6095 /** 6096 * Call this to try to give accessibility focus to this view. 6097 * 6098 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6099 * returns false or the view is no visible or the view already has accessibility 6100 * focus. 6101 * 6102 * See also {@link #focusSearch(int)}, which is what you call to say that you 6103 * have focus, and you want your parent to look for the next one. 6104 * 6105 * @return Whether this view actually took accessibility focus. 6106 * 6107 * @hide 6108 */ 6109 public boolean requestAccessibilityFocus() { 6110 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6111 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6112 return false; 6113 } 6114 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6115 return false; 6116 } 6117 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6118 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6119 ViewRootImpl viewRootImpl = getViewRootImpl(); 6120 if (viewRootImpl != null) { 6121 viewRootImpl.setAccessibilityFocusedHost(this); 6122 } 6123 invalidate(); 6124 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6125 notifyAccessibilityStateChanged(); 6126 // Try to give input focus to this view - not a descendant. 6127 requestFocusNoSearch(View.FOCUS_DOWN, null); 6128 return true; 6129 } 6130 return false; 6131 } 6132 6133 /** 6134 * Call this to try to clear accessibility focus of this view. 6135 * 6136 * See also {@link #focusSearch(int)}, which is what you call to say that you 6137 * have focus, and you want your parent to look for the next one. 6138 * 6139 * @hide 6140 */ 6141 public void clearAccessibilityFocus() { 6142 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6143 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6144 ViewRootImpl viewRootImpl = getViewRootImpl(); 6145 if (viewRootImpl != null) { 6146 viewRootImpl.setAccessibilityFocusedHost(null); 6147 } 6148 invalidate(); 6149 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6150 notifyAccessibilityStateChanged(); 6151 6152 // Clear the text navigation state. 6153 setAccessibilityCursorPosition(-1); 6154 6155 // Try to move accessibility focus to the input focus. 6156 View rootView = getRootView(); 6157 if (rootView != null) { 6158 View inputFocus = rootView.findFocus(); 6159 if (inputFocus != null) { 6160 inputFocus.requestAccessibilityFocus(); 6161 } 6162 } 6163 } 6164 } 6165 6166 /** 6167 * Find the best view to take accessibility focus from a hover. 6168 * This function finds the deepest actionable view and if that 6169 * fails ask the parent to take accessibility focus from hover. 6170 * 6171 * @param x The X hovered location in this view coorditantes. 6172 * @param y The Y hovered location in this view coorditantes. 6173 * @return Whether the request was handled. 6174 * 6175 * @hide 6176 */ 6177 public boolean requestAccessibilityFocusFromHover(float x, float y) { 6178 if (onRequestAccessibilityFocusFromHover(x, y)) { 6179 return true; 6180 } 6181 ViewParent parent = mParent; 6182 if (parent instanceof View) { 6183 View parentView = (View) parent; 6184 6185 float[] position = mAttachInfo.mTmpTransformLocation; 6186 position[0] = x; 6187 position[1] = y; 6188 6189 // Compensate for the transformation of the current matrix. 6190 if (!hasIdentityMatrix()) { 6191 getMatrix().mapPoints(position); 6192 } 6193 6194 // Compensate for the parent scroll and the offset 6195 // of this view stop from the parent top. 6196 position[0] += mLeft - parentView.mScrollX; 6197 position[1] += mTop - parentView.mScrollY; 6198 6199 return parentView.requestAccessibilityFocusFromHover(position[0], position[1]); 6200 } 6201 return false; 6202 } 6203 6204 /** 6205 * Requests to give this View focus from hover. 6206 * 6207 * @param x The X hovered location in this view coorditantes. 6208 * @param y The Y hovered location in this view coorditantes. 6209 * @return Whether the request was handled. 6210 * 6211 * @hide 6212 */ 6213 public boolean onRequestAccessibilityFocusFromHover(float x, float y) { 6214 if (includeForAccessibility() 6215 && (isActionableForAccessibility() || hasListenersForAccessibility())) { 6216 return requestAccessibilityFocus(); 6217 } 6218 return false; 6219 } 6220 6221 /** 6222 * Clears accessibility focus without calling any callback methods 6223 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6224 * is used for clearing accessibility focus when giving this focus to 6225 * another view. 6226 */ 6227 void clearAccessibilityFocusNoCallbacks() { 6228 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6229 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6230 invalidate(); 6231 } 6232 } 6233 6234 /** 6235 * Call this to try to give focus to a specific view or to one of its 6236 * descendants. 6237 * 6238 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6239 * false), or if it is focusable and it is not focusable in touch mode 6240 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6241 * 6242 * See also {@link #focusSearch(int)}, which is what you call to say that you 6243 * have focus, and you want your parent to look for the next one. 6244 * 6245 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6246 * {@link #FOCUS_DOWN} and <code>null</code>. 6247 * 6248 * @return Whether this view or one of its descendants actually took focus. 6249 */ 6250 public final boolean requestFocus() { 6251 return requestFocus(View.FOCUS_DOWN); 6252 } 6253 6254 /** 6255 * Call this to try to give focus to a specific view or to one of its 6256 * descendants and give it a hint about what direction focus is heading. 6257 * 6258 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6259 * false), or if it is focusable and it is not focusable in touch mode 6260 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6261 * 6262 * See also {@link #focusSearch(int)}, which is what you call to say that you 6263 * have focus, and you want your parent to look for the next one. 6264 * 6265 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6266 * <code>null</code> set for the previously focused rectangle. 6267 * 6268 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6269 * @return Whether this view or one of its descendants actually took focus. 6270 */ 6271 public final boolean requestFocus(int direction) { 6272 return requestFocus(direction, null); 6273 } 6274 6275 /** 6276 * Call this to try to give focus to a specific view or to one of its descendants 6277 * and give it hints about the direction and a specific rectangle that the focus 6278 * is coming from. The rectangle can help give larger views a finer grained hint 6279 * about where focus is coming from, and therefore, where to show selection, or 6280 * forward focus change internally. 6281 * 6282 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6283 * false), or if it is focusable and it is not focusable in touch mode 6284 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6285 * 6286 * A View will not take focus if it is not visible. 6287 * 6288 * A View will not take focus if one of its parents has 6289 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6290 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6291 * 6292 * See also {@link #focusSearch(int)}, which is what you call to say that you 6293 * have focus, and you want your parent to look for the next one. 6294 * 6295 * You may wish to override this method if your custom {@link View} has an internal 6296 * {@link View} that it wishes to forward the request to. 6297 * 6298 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6299 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6300 * to give a finer grained hint about where focus is coming from. May be null 6301 * if there is no hint. 6302 * @return Whether this view or one of its descendants actually took focus. 6303 */ 6304 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6305 return requestFocusNoSearch(direction, previouslyFocusedRect); 6306 } 6307 6308 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6309 // need to be focusable 6310 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6311 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6312 return false; 6313 } 6314 6315 // need to be focusable in touch mode if in touch mode 6316 if (isInTouchMode() && 6317 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6318 return false; 6319 } 6320 6321 // need to not have any parents blocking us 6322 if (hasAncestorThatBlocksDescendantFocus()) { 6323 return false; 6324 } 6325 6326 handleFocusGainInternal(direction, previouslyFocusedRect); 6327 return true; 6328 } 6329 6330 /** 6331 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6332 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6333 * touch mode to request focus when they are touched. 6334 * 6335 * @return Whether this view or one of its descendants actually took focus. 6336 * 6337 * @see #isInTouchMode() 6338 * 6339 */ 6340 public final boolean requestFocusFromTouch() { 6341 // Leave touch mode if we need to 6342 if (isInTouchMode()) { 6343 ViewRootImpl viewRoot = getViewRootImpl(); 6344 if (viewRoot != null) { 6345 viewRoot.ensureTouchMode(false); 6346 } 6347 } 6348 return requestFocus(View.FOCUS_DOWN); 6349 } 6350 6351 /** 6352 * @return Whether any ancestor of this view blocks descendant focus. 6353 */ 6354 private boolean hasAncestorThatBlocksDescendantFocus() { 6355 ViewParent ancestor = mParent; 6356 while (ancestor instanceof ViewGroup) { 6357 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6358 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6359 return true; 6360 } else { 6361 ancestor = vgAncestor.getParent(); 6362 } 6363 } 6364 return false; 6365 } 6366 6367 /** 6368 * Gets the mode for determining whether this View is important for accessibility 6369 * which is if it fires accessibility events and if it is reported to 6370 * accessibility services that query the screen. 6371 * 6372 * @return The mode for determining whether a View is important for accessibility. 6373 * 6374 * @attr ref android.R.styleable#View_importantForAccessibility 6375 * 6376 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6377 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6378 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6379 */ 6380 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6381 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6382 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6383 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6384 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6385 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6386 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6387 }) 6388 public int getImportantForAccessibility() { 6389 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6390 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6391 } 6392 6393 /** 6394 * Sets how to determine whether this view is important for accessibility 6395 * which is if it fires accessibility events and if it is reported to 6396 * accessibility services that query the screen. 6397 * 6398 * @param mode How to determine whether this view is important for accessibility. 6399 * 6400 * @attr ref android.R.styleable#View_importantForAccessibility 6401 * 6402 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6403 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6404 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6405 */ 6406 public void setImportantForAccessibility(int mode) { 6407 if (mode != getImportantForAccessibility()) { 6408 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6409 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6410 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6411 notifyAccessibilityStateChanged(); 6412 } 6413 } 6414 6415 /** 6416 * Gets whether this view should be exposed for accessibility. 6417 * 6418 * @return Whether the view is exposed for accessibility. 6419 * 6420 * @hide 6421 */ 6422 public boolean isImportantForAccessibility() { 6423 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6424 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6425 switch (mode) { 6426 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6427 return true; 6428 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6429 return false; 6430 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6431 return isActionableForAccessibility() || hasListenersForAccessibility(); 6432 default: 6433 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6434 + mode); 6435 } 6436 } 6437 6438 /** 6439 * Gets the parent for accessibility purposes. Note that the parent for 6440 * accessibility is not necessary the immediate parent. It is the first 6441 * predecessor that is important for accessibility. 6442 * 6443 * @return The parent for accessibility purposes. 6444 */ 6445 public ViewParent getParentForAccessibility() { 6446 if (mParent instanceof View) { 6447 View parentView = (View) mParent; 6448 if (parentView.includeForAccessibility()) { 6449 return mParent; 6450 } else { 6451 return mParent.getParentForAccessibility(); 6452 } 6453 } 6454 return null; 6455 } 6456 6457 /** 6458 * Adds the children of a given View for accessibility. Since some Views are 6459 * not important for accessibility the children for accessibility are not 6460 * necessarily direct children of the riew, rather they are the first level of 6461 * descendants important for accessibility. 6462 * 6463 * @param children The list of children for accessibility. 6464 */ 6465 public void addChildrenForAccessibility(ArrayList<View> children) { 6466 if (includeForAccessibility()) { 6467 children.add(this); 6468 } 6469 } 6470 6471 /** 6472 * Whether to regard this view for accessibility. A view is regarded for 6473 * accessibility if it is important for accessibility or the querying 6474 * accessibility service has explicitly requested that view not 6475 * important for accessibility are regarded. 6476 * 6477 * @return Whether to regard the view for accessibility. 6478 */ 6479 boolean includeForAccessibility() { 6480 if (mAttachInfo != null) { 6481 if (!mAttachInfo.mIncludeNotImportantViews) { 6482 return isImportantForAccessibility(); 6483 } else { 6484 return true; 6485 } 6486 } 6487 return false; 6488 } 6489 6490 /** 6491 * Returns whether the View is considered actionable from 6492 * accessibility perspective. Such view are important for 6493 * accessiiblity. 6494 * 6495 * @return True if the view is actionable for accessibility. 6496 */ 6497 private boolean isActionableForAccessibility() { 6498 return (isClickable() || isLongClickable() || isFocusable()); 6499 } 6500 6501 /** 6502 * Returns whether the View has registered callbacks wich makes it 6503 * important for accessiiblity. 6504 * 6505 * @return True if the view is actionable for accessibility. 6506 */ 6507 private boolean hasListenersForAccessibility() { 6508 ListenerInfo info = getListenerInfo(); 6509 return mTouchDelegate != null || info.mOnKeyListener != null 6510 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6511 || info.mOnHoverListener != null || info.mOnDragListener != null; 6512 } 6513 6514 /** 6515 * Notifies accessibility services that some view's important for 6516 * accessibility state has changed. Note that such notifications 6517 * are made at most once every 6518 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6519 * to avoid unnecessary load to the system. Also once a view has 6520 * made a notifucation this method is a NOP until the notification has 6521 * been sent to clients. 6522 * 6523 * @hide 6524 * 6525 * TODO: Makse sure this method is called for any view state change 6526 * that is interesting for accessilility purposes. 6527 */ 6528 public void notifyAccessibilityStateChanged() { 6529 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6530 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6531 if (mParent != null) { 6532 mParent.childAccessibilityStateChanged(this); 6533 } 6534 } 6535 } 6536 6537 /** 6538 * Reset the state indicating the this view has requested clients 6539 * interested in its accessiblity state to be notified. 6540 * 6541 * @hide 6542 */ 6543 public void resetAccessibilityStateChanged() { 6544 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6545 } 6546 6547 /** 6548 * Performs the specified accessibility action on the view. For 6549 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6550 * <p> 6551 * If an {@link AccessibilityDelegate} has been specified via calling 6552 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6553 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6554 * is responsible for handling this call. 6555 * </p> 6556 * 6557 * @param action The action to perform. 6558 * @param arguments Optional action arguments. 6559 * @return Whether the action was performed. 6560 */ 6561 public boolean performAccessibilityAction(int action, Bundle arguments) { 6562 if (mAccessibilityDelegate != null) { 6563 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6564 } else { 6565 return performAccessibilityActionInternal(action, arguments); 6566 } 6567 } 6568 6569 /** 6570 * @see #performAccessibilityAction(int, Bundle) 6571 * 6572 * Note: Called from the default {@link AccessibilityDelegate}. 6573 */ 6574 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6575 switch (action) { 6576 case AccessibilityNodeInfo.ACTION_CLICK: { 6577 if (isClickable()) { 6578 return performClick(); 6579 } 6580 } break; 6581 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6582 if (isLongClickable()) { 6583 return performLongClick(); 6584 } 6585 } break; 6586 case AccessibilityNodeInfo.ACTION_FOCUS: { 6587 if (!hasFocus()) { 6588 // Get out of touch mode since accessibility 6589 // wants to move focus around. 6590 getViewRootImpl().ensureTouchMode(false); 6591 return requestFocus(); 6592 } 6593 } break; 6594 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6595 if (hasFocus()) { 6596 clearFocus(); 6597 return !isFocused(); 6598 } 6599 } break; 6600 case AccessibilityNodeInfo.ACTION_SELECT: { 6601 if (!isSelected()) { 6602 setSelected(true); 6603 return isSelected(); 6604 } 6605 } break; 6606 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6607 if (isSelected()) { 6608 setSelected(false); 6609 return !isSelected(); 6610 } 6611 } break; 6612 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6613 if (!isAccessibilityFocused()) { 6614 return requestAccessibilityFocus(); 6615 } 6616 } break; 6617 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6618 if (isAccessibilityFocused()) { 6619 clearAccessibilityFocus(); 6620 return true; 6621 } 6622 } break; 6623 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6624 if (arguments != null) { 6625 final int granularity = arguments.getInt( 6626 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6627 return nextAtGranularity(granularity); 6628 } 6629 } break; 6630 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6631 if (arguments != null) { 6632 final int granularity = arguments.getInt( 6633 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6634 return previousAtGranularity(granularity); 6635 } 6636 } break; 6637 } 6638 return false; 6639 } 6640 6641 private boolean nextAtGranularity(int granularity) { 6642 CharSequence text = getIterableTextForAccessibility(); 6643 if (text != null && text.length() > 0) { 6644 return false; 6645 } 6646 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6647 if (iterator == null) { 6648 return false; 6649 } 6650 final int current = getAccessibilityCursorPosition(); 6651 final int[] range = iterator.following(current); 6652 if (range == null) { 6653 setAccessibilityCursorPosition(-1); 6654 return false; 6655 } 6656 final int start = range[0]; 6657 final int end = range[1]; 6658 setAccessibilityCursorPosition(start); 6659 sendViewTextTraversedAtGranularityEvent( 6660 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6661 granularity, start, end); 6662 return true; 6663 } 6664 6665 private boolean previousAtGranularity(int granularity) { 6666 CharSequence text = getIterableTextForAccessibility(); 6667 if (text != null && text.length() > 0) { 6668 return false; 6669 } 6670 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6671 if (iterator == null) { 6672 return false; 6673 } 6674 final int selectionStart = getAccessibilityCursorPosition(); 6675 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6676 final int[] range = iterator.preceding(current); 6677 if (range == null) { 6678 setAccessibilityCursorPosition(-1); 6679 return false; 6680 } 6681 final int start = range[0]; 6682 final int end = range[1]; 6683 setAccessibilityCursorPosition(end); 6684 sendViewTextTraversedAtGranularityEvent( 6685 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6686 granularity, start, end); 6687 return true; 6688 } 6689 6690 /** 6691 * Gets the text reported for accessibility purposes. 6692 * 6693 * @return The accessibility text. 6694 * 6695 * @hide 6696 */ 6697 public CharSequence getIterableTextForAccessibility() { 6698 return mContentDescription; 6699 } 6700 6701 /** 6702 * @hide 6703 */ 6704 public int getAccessibilityCursorPosition() { 6705 return mAccessibilityCursorPosition; 6706 } 6707 6708 /** 6709 * @hide 6710 */ 6711 public void setAccessibilityCursorPosition(int position) { 6712 mAccessibilityCursorPosition = position; 6713 } 6714 6715 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6716 int fromIndex, int toIndex) { 6717 if (mParent == null) { 6718 return; 6719 } 6720 AccessibilityEvent event = AccessibilityEvent.obtain( 6721 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6722 onInitializeAccessibilityEvent(event); 6723 onPopulateAccessibilityEvent(event); 6724 event.setFromIndex(fromIndex); 6725 event.setToIndex(toIndex); 6726 event.setAction(action); 6727 event.setMovementGranularity(granularity); 6728 mParent.requestSendAccessibilityEvent(this, event); 6729 } 6730 6731 /** 6732 * @hide 6733 */ 6734 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6735 switch (granularity) { 6736 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6737 CharSequence text = getIterableTextForAccessibility(); 6738 if (text != null && text.length() > 0) { 6739 CharacterTextSegmentIterator iterator = 6740 CharacterTextSegmentIterator.getInstance(mContext); 6741 iterator.initialize(text.toString()); 6742 return iterator; 6743 } 6744 } break; 6745 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6746 CharSequence text = getIterableTextForAccessibility(); 6747 if (text != null && text.length() > 0) { 6748 WordTextSegmentIterator iterator = 6749 WordTextSegmentIterator.getInstance(mContext); 6750 iterator.initialize(text.toString()); 6751 return iterator; 6752 } 6753 } break; 6754 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6755 CharSequence text = getIterableTextForAccessibility(); 6756 if (text != null && text.length() > 0) { 6757 ParagraphTextSegmentIterator iterator = 6758 ParagraphTextSegmentIterator.getInstance(); 6759 iterator.initialize(text.toString()); 6760 return iterator; 6761 } 6762 } break; 6763 } 6764 return null; 6765 } 6766 6767 /** 6768 * @hide 6769 */ 6770 public void dispatchStartTemporaryDetach() { 6771 clearAccessibilityFocus(); 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 * @param keyCode A key code that represents the button pressed, from 7360 * {@link android.view.KeyEvent}. 7361 * @param event The KeyEvent object that defines the button action. 7362 */ 7363 public boolean onKeyDown(int keyCode, KeyEvent event) { 7364 boolean result = false; 7365 7366 switch (keyCode) { 7367 case KeyEvent.KEYCODE_DPAD_CENTER: 7368 case KeyEvent.KEYCODE_ENTER: { 7369 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7370 return true; 7371 } 7372 // Long clickable items don't necessarily have to be clickable 7373 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7374 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7375 (event.getRepeatCount() == 0)) { 7376 setPressed(true); 7377 checkForLongClick(0); 7378 return true; 7379 } 7380 break; 7381 } 7382 } 7383 return result; 7384 } 7385 7386 /** 7387 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7388 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7389 * the event). 7390 */ 7391 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7392 return false; 7393 } 7394 7395 /** 7396 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7397 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7398 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7399 * {@link KeyEvent#KEYCODE_ENTER} is released. 7400 * 7401 * @param keyCode A key code that represents the button pressed, from 7402 * {@link android.view.KeyEvent}. 7403 * @param event The KeyEvent object that defines the button action. 7404 */ 7405 public boolean onKeyUp(int keyCode, KeyEvent event) { 7406 boolean result = false; 7407 7408 switch (keyCode) { 7409 case KeyEvent.KEYCODE_DPAD_CENTER: 7410 case KeyEvent.KEYCODE_ENTER: { 7411 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7412 return true; 7413 } 7414 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7415 setPressed(false); 7416 7417 if (!mHasPerformedLongPress) { 7418 // This is a tap, so remove the longpress check 7419 removeLongPressCallback(); 7420 7421 result = performClick(); 7422 } 7423 } 7424 break; 7425 } 7426 } 7427 return result; 7428 } 7429 7430 /** 7431 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7432 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7433 * the event). 7434 * 7435 * @param keyCode A key code that represents the button pressed, from 7436 * {@link android.view.KeyEvent}. 7437 * @param repeatCount The number of times the action was made. 7438 * @param event The KeyEvent object that defines the button action. 7439 */ 7440 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7441 return false; 7442 } 7443 7444 /** 7445 * Called on the focused view when a key shortcut event is not handled. 7446 * Override this method to implement local key shortcuts for the View. 7447 * Key shortcuts can also be implemented by setting the 7448 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7449 * 7450 * @param keyCode The value in event.getKeyCode(). 7451 * @param event Description of the key event. 7452 * @return If you handled the event, return true. If you want to allow the 7453 * event to be handled by the next receiver, return false. 7454 */ 7455 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7456 return false; 7457 } 7458 7459 /** 7460 * Check whether the called view is a text editor, in which case it 7461 * would make sense to automatically display a soft input window for 7462 * it. Subclasses should override this if they implement 7463 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7464 * a call on that method would return a non-null InputConnection, and 7465 * they are really a first-class editor that the user would normally 7466 * start typing on when the go into a window containing your view. 7467 * 7468 * <p>The default implementation always returns false. This does 7469 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7470 * will not be called or the user can not otherwise perform edits on your 7471 * view; it is just a hint to the system that this is not the primary 7472 * purpose of this view. 7473 * 7474 * @return Returns true if this view is a text editor, else false. 7475 */ 7476 public boolean onCheckIsTextEditor() { 7477 return false; 7478 } 7479 7480 /** 7481 * Create a new InputConnection for an InputMethod to interact 7482 * with the view. The default implementation returns null, since it doesn't 7483 * support input methods. You can override this to implement such support. 7484 * This is only needed for views that take focus and text input. 7485 * 7486 * <p>When implementing this, you probably also want to implement 7487 * {@link #onCheckIsTextEditor()} to indicate you will return a 7488 * non-null InputConnection. 7489 * 7490 * @param outAttrs Fill in with attribute information about the connection. 7491 */ 7492 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7493 return null; 7494 } 7495 7496 /** 7497 * Called by the {@link android.view.inputmethod.InputMethodManager} 7498 * when a view who is not the current 7499 * input connection target is trying to make a call on the manager. The 7500 * default implementation returns false; you can override this to return 7501 * true for certain views if you are performing InputConnection proxying 7502 * to them. 7503 * @param view The View that is making the InputMethodManager call. 7504 * @return Return true to allow the call, false to reject. 7505 */ 7506 public boolean checkInputConnectionProxy(View view) { 7507 return false; 7508 } 7509 7510 /** 7511 * Show the context menu for this view. It is not safe to hold on to the 7512 * menu after returning from this method. 7513 * 7514 * You should normally not overload this method. Overload 7515 * {@link #onCreateContextMenu(ContextMenu)} or define an 7516 * {@link OnCreateContextMenuListener} to add items to the context menu. 7517 * 7518 * @param menu The context menu to populate 7519 */ 7520 public void createContextMenu(ContextMenu menu) { 7521 ContextMenuInfo menuInfo = getContextMenuInfo(); 7522 7523 // Sets the current menu info so all items added to menu will have 7524 // my extra info set. 7525 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7526 7527 onCreateContextMenu(menu); 7528 ListenerInfo li = mListenerInfo; 7529 if (li != null && li.mOnCreateContextMenuListener != null) { 7530 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7531 } 7532 7533 // Clear the extra information so subsequent items that aren't mine don't 7534 // have my extra info. 7535 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7536 7537 if (mParent != null) { 7538 mParent.createContextMenu(menu); 7539 } 7540 } 7541 7542 /** 7543 * Views should implement this if they have extra information to associate 7544 * with the context menu. The return result is supplied as a parameter to 7545 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7546 * callback. 7547 * 7548 * @return Extra information about the item for which the context menu 7549 * should be shown. This information will vary across different 7550 * subclasses of View. 7551 */ 7552 protected ContextMenuInfo getContextMenuInfo() { 7553 return null; 7554 } 7555 7556 /** 7557 * Views should implement this if the view itself is going to add items to 7558 * the context menu. 7559 * 7560 * @param menu the context menu to populate 7561 */ 7562 protected void onCreateContextMenu(ContextMenu menu) { 7563 } 7564 7565 /** 7566 * Implement this method to handle trackball motion events. The 7567 * <em>relative</em> movement of the trackball since the last event 7568 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7569 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7570 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7571 * they will often be fractional values, representing the more fine-grained 7572 * movement information available from a trackball). 7573 * 7574 * @param event The motion event. 7575 * @return True if the event was handled, false otherwise. 7576 */ 7577 public boolean onTrackballEvent(MotionEvent event) { 7578 return false; 7579 } 7580 7581 /** 7582 * Implement this method to handle generic motion events. 7583 * <p> 7584 * Generic motion events describe joystick movements, mouse hovers, track pad 7585 * touches, scroll wheel movements and other input events. The 7586 * {@link MotionEvent#getSource() source} of the motion event specifies 7587 * the class of input that was received. Implementations of this method 7588 * must examine the bits in the source before processing the event. 7589 * The following code example shows how this is done. 7590 * </p><p> 7591 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7592 * are delivered to the view under the pointer. All other generic motion events are 7593 * delivered to the focused view. 7594 * </p> 7595 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7596 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7597 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7598 * // process the joystick movement... 7599 * return true; 7600 * } 7601 * } 7602 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7603 * switch (event.getAction()) { 7604 * case MotionEvent.ACTION_HOVER_MOVE: 7605 * // process the mouse hover movement... 7606 * return true; 7607 * case MotionEvent.ACTION_SCROLL: 7608 * // process the scroll wheel movement... 7609 * return true; 7610 * } 7611 * } 7612 * return super.onGenericMotionEvent(event); 7613 * }</pre> 7614 * 7615 * @param event The generic motion event being processed. 7616 * @return True if the event was handled, false otherwise. 7617 */ 7618 public boolean onGenericMotionEvent(MotionEvent event) { 7619 return false; 7620 } 7621 7622 /** 7623 * Implement this method to handle hover events. 7624 * <p> 7625 * This method is called whenever a pointer is hovering into, over, or out of the 7626 * bounds of a view and the view is not currently being touched. 7627 * Hover events are represented as pointer events with action 7628 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7629 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7630 * </p> 7631 * <ul> 7632 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7633 * when the pointer enters the bounds of the view.</li> 7634 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7635 * when the pointer has already entered the bounds of the view and has moved.</li> 7636 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7637 * when the pointer has exited the bounds of the view or when the pointer is 7638 * about to go down due to a button click, tap, or similar user action that 7639 * causes the view to be touched.</li> 7640 * </ul> 7641 * <p> 7642 * The view should implement this method to return true to indicate that it is 7643 * handling the hover event, such as by changing its drawable state. 7644 * </p><p> 7645 * The default implementation calls {@link #setHovered} to update the hovered state 7646 * of the view when a hover enter or hover exit event is received, if the view 7647 * is enabled and is clickable. The default implementation also sends hover 7648 * accessibility events. 7649 * </p> 7650 * 7651 * @param event The motion event that describes the hover. 7652 * @return True if the view handled the hover event. 7653 * 7654 * @see #isHovered 7655 * @see #setHovered 7656 * @see #onHoverChanged 7657 */ 7658 public boolean onHoverEvent(MotionEvent event) { 7659 // The root view may receive hover (or touch) events that are outside the bounds of 7660 // the window. This code ensures that we only send accessibility events for 7661 // hovers that are actually within the bounds of the root view. 7662 final int action = event.getActionMasked(); 7663 if (!mSendingHoverAccessibilityEvents) { 7664 if ((action == MotionEvent.ACTION_HOVER_ENTER 7665 || action == MotionEvent.ACTION_HOVER_MOVE) 7666 && !hasHoveredChild() 7667 && pointInView(event.getX(), event.getY())) { 7668 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7669 mSendingHoverAccessibilityEvents = true; 7670 requestAccessibilityFocusFromHover((int) event.getX(), (int) event.getY()); 7671 } 7672 } else { 7673 if (action == MotionEvent.ACTION_HOVER_EXIT 7674 || (action == MotionEvent.ACTION_MOVE 7675 && !pointInView(event.getX(), event.getY()))) { 7676 mSendingHoverAccessibilityEvents = false; 7677 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7678 // If the window does not have input focus we take away accessibility 7679 // focus as soon as the user stop hovering over the view. 7680 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7681 getViewRootImpl().setAccessibilityFocusedHost(null); 7682 } 7683 } 7684 } 7685 7686 if (isHoverable()) { 7687 switch (action) { 7688 case MotionEvent.ACTION_HOVER_ENTER: 7689 setHovered(true); 7690 break; 7691 case MotionEvent.ACTION_HOVER_EXIT: 7692 setHovered(false); 7693 break; 7694 } 7695 7696 // Dispatch the event to onGenericMotionEvent before returning true. 7697 // This is to provide compatibility with existing applications that 7698 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7699 // break because of the new default handling for hoverable views 7700 // in onHoverEvent. 7701 // Note that onGenericMotionEvent will be called by default when 7702 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7703 dispatchGenericMotionEventInternal(event); 7704 return true; 7705 } 7706 7707 return false; 7708 } 7709 7710 /** 7711 * Returns true if the view should handle {@link #onHoverEvent} 7712 * by calling {@link #setHovered} to change its hovered state. 7713 * 7714 * @return True if the view is hoverable. 7715 */ 7716 private boolean isHoverable() { 7717 final int viewFlags = mViewFlags; 7718 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7719 return false; 7720 } 7721 7722 return (viewFlags & CLICKABLE) == CLICKABLE 7723 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7724 } 7725 7726 /** 7727 * Returns true if the view is currently hovered. 7728 * 7729 * @return True if the view is currently hovered. 7730 * 7731 * @see #setHovered 7732 * @see #onHoverChanged 7733 */ 7734 @ViewDebug.ExportedProperty 7735 public boolean isHovered() { 7736 return (mPrivateFlags & HOVERED) != 0; 7737 } 7738 7739 /** 7740 * Sets whether the view is currently hovered. 7741 * <p> 7742 * Calling this method also changes the drawable state of the view. This 7743 * enables the view to react to hover by using different drawable resources 7744 * to change its appearance. 7745 * </p><p> 7746 * The {@link #onHoverChanged} method is called when the hovered state changes. 7747 * </p> 7748 * 7749 * @param hovered True if the view is hovered. 7750 * 7751 * @see #isHovered 7752 * @see #onHoverChanged 7753 */ 7754 public void setHovered(boolean hovered) { 7755 if (hovered) { 7756 if ((mPrivateFlags & HOVERED) == 0) { 7757 mPrivateFlags |= HOVERED; 7758 refreshDrawableState(); 7759 onHoverChanged(true); 7760 } 7761 } else { 7762 if ((mPrivateFlags & HOVERED) != 0) { 7763 mPrivateFlags &= ~HOVERED; 7764 refreshDrawableState(); 7765 onHoverChanged(false); 7766 } 7767 } 7768 } 7769 7770 /** 7771 * Implement this method to handle hover state changes. 7772 * <p> 7773 * This method is called whenever the hover state changes as a result of a 7774 * call to {@link #setHovered}. 7775 * </p> 7776 * 7777 * @param hovered The current hover state, as returned by {@link #isHovered}. 7778 * 7779 * @see #isHovered 7780 * @see #setHovered 7781 */ 7782 public void onHoverChanged(boolean hovered) { 7783 } 7784 7785 /** 7786 * Implement this method to handle touch screen motion events. 7787 * 7788 * @param event The motion event. 7789 * @return True if the event was handled, false otherwise. 7790 */ 7791 public boolean onTouchEvent(MotionEvent event) { 7792 final int viewFlags = mViewFlags; 7793 7794 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7795 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7796 setPressed(false); 7797 } 7798 // A disabled view that is clickable still consumes the touch 7799 // events, it just doesn't respond to them. 7800 return (((viewFlags & CLICKABLE) == CLICKABLE || 7801 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7802 } 7803 7804 if (mTouchDelegate != null) { 7805 if (mTouchDelegate.onTouchEvent(event)) { 7806 return true; 7807 } 7808 } 7809 7810 if (((viewFlags & CLICKABLE) == CLICKABLE || 7811 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7812 switch (event.getAction()) { 7813 case MotionEvent.ACTION_UP: 7814 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7815 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7816 // take focus if we don't have it already and we should in 7817 // touch mode. 7818 boolean focusTaken = false; 7819 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7820 focusTaken = requestFocus(); 7821 } 7822 7823 if (prepressed) { 7824 // The button is being released before we actually 7825 // showed it as pressed. Make it show the pressed 7826 // state now (before scheduling the click) to ensure 7827 // the user sees it. 7828 setPressed(true); 7829 } 7830 7831 if (!mHasPerformedLongPress) { 7832 // This is a tap, so remove the longpress check 7833 removeLongPressCallback(); 7834 7835 // Only perform take click actions if we were in the pressed state 7836 if (!focusTaken) { 7837 // Use a Runnable and post this rather than calling 7838 // performClick directly. This lets other visual state 7839 // of the view update before click actions start. 7840 if (mPerformClick == null) { 7841 mPerformClick = new PerformClick(); 7842 } 7843 if (!post(mPerformClick)) { 7844 performClick(); 7845 } 7846 } 7847 } 7848 7849 if (mUnsetPressedState == null) { 7850 mUnsetPressedState = new UnsetPressedState(); 7851 } 7852 7853 if (prepressed) { 7854 postDelayed(mUnsetPressedState, 7855 ViewConfiguration.getPressedStateDuration()); 7856 } else if (!post(mUnsetPressedState)) { 7857 // If the post failed, unpress right now 7858 mUnsetPressedState.run(); 7859 } 7860 removeTapCallback(); 7861 } 7862 break; 7863 7864 case MotionEvent.ACTION_DOWN: 7865 mHasPerformedLongPress = false; 7866 7867 if (performButtonActionOnTouchDown(event)) { 7868 break; 7869 } 7870 7871 // Walk up the hierarchy to determine if we're inside a scrolling container. 7872 boolean isInScrollingContainer = isInScrollingContainer(); 7873 7874 // For views inside a scrolling container, delay the pressed feedback for 7875 // a short period in case this is a scroll. 7876 if (isInScrollingContainer) { 7877 mPrivateFlags |= PREPRESSED; 7878 if (mPendingCheckForTap == null) { 7879 mPendingCheckForTap = new CheckForTap(); 7880 } 7881 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7882 } else { 7883 // Not inside a scrolling container, so show the feedback right away 7884 setPressed(true); 7885 checkForLongClick(0); 7886 } 7887 break; 7888 7889 case MotionEvent.ACTION_CANCEL: 7890 setPressed(false); 7891 removeTapCallback(); 7892 break; 7893 7894 case MotionEvent.ACTION_MOVE: 7895 final int x = (int) event.getX(); 7896 final int y = (int) event.getY(); 7897 7898 // Be lenient about moving outside of buttons 7899 if (!pointInView(x, y, mTouchSlop)) { 7900 // Outside button 7901 removeTapCallback(); 7902 if ((mPrivateFlags & PRESSED) != 0) { 7903 // Remove any future long press/tap checks 7904 removeLongPressCallback(); 7905 7906 setPressed(false); 7907 } 7908 } 7909 break; 7910 } 7911 return true; 7912 } 7913 7914 return false; 7915 } 7916 7917 /** 7918 * @hide 7919 */ 7920 public boolean isInScrollingContainer() { 7921 ViewParent p = getParent(); 7922 while (p != null && p instanceof ViewGroup) { 7923 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7924 return true; 7925 } 7926 p = p.getParent(); 7927 } 7928 return false; 7929 } 7930 7931 /** 7932 * Remove the longpress detection timer. 7933 */ 7934 private void removeLongPressCallback() { 7935 if (mPendingCheckForLongPress != null) { 7936 removeCallbacks(mPendingCheckForLongPress); 7937 } 7938 } 7939 7940 /** 7941 * Remove the pending click action 7942 */ 7943 private void removePerformClickCallback() { 7944 if (mPerformClick != null) { 7945 removeCallbacks(mPerformClick); 7946 } 7947 } 7948 7949 /** 7950 * Remove the prepress detection timer. 7951 */ 7952 private void removeUnsetPressCallback() { 7953 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7954 setPressed(false); 7955 removeCallbacks(mUnsetPressedState); 7956 } 7957 } 7958 7959 /** 7960 * Remove the tap detection timer. 7961 */ 7962 private void removeTapCallback() { 7963 if (mPendingCheckForTap != null) { 7964 mPrivateFlags &= ~PREPRESSED; 7965 removeCallbacks(mPendingCheckForTap); 7966 } 7967 } 7968 7969 /** 7970 * Cancels a pending long press. Your subclass can use this if you 7971 * want the context menu to come up if the user presses and holds 7972 * at the same place, but you don't want it to come up if they press 7973 * and then move around enough to cause scrolling. 7974 */ 7975 public void cancelLongPress() { 7976 removeLongPressCallback(); 7977 7978 /* 7979 * The prepressed state handled by the tap callback is a display 7980 * construct, but the tap callback will post a long press callback 7981 * less its own timeout. Remove it here. 7982 */ 7983 removeTapCallback(); 7984 } 7985 7986 /** 7987 * Remove the pending callback for sending a 7988 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7989 */ 7990 private void removeSendViewScrolledAccessibilityEventCallback() { 7991 if (mSendViewScrolledAccessibilityEvent != null) { 7992 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7993 } 7994 } 7995 7996 /** 7997 * Sets the TouchDelegate for this View. 7998 */ 7999 public void setTouchDelegate(TouchDelegate delegate) { 8000 mTouchDelegate = delegate; 8001 } 8002 8003 /** 8004 * Gets the TouchDelegate for this View. 8005 */ 8006 public TouchDelegate getTouchDelegate() { 8007 return mTouchDelegate; 8008 } 8009 8010 /** 8011 * Set flags controlling behavior of this view. 8012 * 8013 * @param flags Constant indicating the value which should be set 8014 * @param mask Constant indicating the bit range that should be changed 8015 */ 8016 void setFlags(int flags, int mask) { 8017 int old = mViewFlags; 8018 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8019 8020 int changed = mViewFlags ^ old; 8021 if (changed == 0) { 8022 return; 8023 } 8024 int privateFlags = mPrivateFlags; 8025 8026 /* Check if the FOCUSABLE bit has changed */ 8027 if (((changed & FOCUSABLE_MASK) != 0) && 8028 ((privateFlags & HAS_BOUNDS) !=0)) { 8029 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8030 && ((privateFlags & FOCUSED) != 0)) { 8031 /* Give up focus if we are no longer focusable */ 8032 clearFocus(); 8033 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8034 && ((privateFlags & FOCUSED) == 0)) { 8035 /* 8036 * Tell the view system that we are now available to take focus 8037 * if no one else already has it. 8038 */ 8039 if (mParent != null) mParent.focusableViewAvailable(this); 8040 } 8041 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8042 notifyAccessibilityStateChanged(); 8043 } 8044 } 8045 8046 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8047 if ((changed & VISIBILITY_MASK) != 0) { 8048 /* 8049 * If this view is becoming visible, invalidate it in case it changed while 8050 * it was not visible. Marking it drawn ensures that the invalidation will 8051 * go through. 8052 */ 8053 mPrivateFlags |= DRAWN; 8054 invalidate(true); 8055 8056 needGlobalAttributesUpdate(true); 8057 8058 // a view becoming visible is worth notifying the parent 8059 // about in case nothing has focus. even if this specific view 8060 // isn't focusable, it may contain something that is, so let 8061 // the root view try to give this focus if nothing else does. 8062 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8063 mParent.focusableViewAvailable(this); 8064 } 8065 } 8066 } 8067 8068 /* Check if the GONE bit has changed */ 8069 if ((changed & GONE) != 0) { 8070 needGlobalAttributesUpdate(false); 8071 requestLayout(); 8072 8073 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8074 if (hasFocus()) clearFocus(); 8075 clearAccessibilityFocus(); 8076 destroyDrawingCache(); 8077 if (mParent instanceof View) { 8078 // GONE views noop invalidation, so invalidate the parent 8079 ((View) mParent).invalidate(true); 8080 } 8081 // Mark the view drawn to ensure that it gets invalidated properly the next 8082 // time it is visible and gets invalidated 8083 mPrivateFlags |= DRAWN; 8084 } 8085 if (mAttachInfo != null) { 8086 mAttachInfo.mViewVisibilityChanged = true; 8087 } 8088 } 8089 8090 /* Check if the VISIBLE bit has changed */ 8091 if ((changed & INVISIBLE) != 0) { 8092 needGlobalAttributesUpdate(false); 8093 /* 8094 * If this view is becoming invisible, set the DRAWN flag so that 8095 * the next invalidate() will not be skipped. 8096 */ 8097 mPrivateFlags |= DRAWN; 8098 8099 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8100 // root view becoming invisible shouldn't clear focus and accessibility focus 8101 if (getRootView() != this) { 8102 clearFocus(); 8103 clearAccessibilityFocus(); 8104 } 8105 } 8106 if (mAttachInfo != null) { 8107 mAttachInfo.mViewVisibilityChanged = true; 8108 } 8109 } 8110 8111 if ((changed & VISIBILITY_MASK) != 0) { 8112 if (mParent instanceof ViewGroup) { 8113 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8114 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8115 ((View) mParent).invalidate(true); 8116 } else if (mParent != null) { 8117 mParent.invalidateChild(this, null); 8118 } 8119 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8120 } 8121 8122 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8123 destroyDrawingCache(); 8124 } 8125 8126 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8127 destroyDrawingCache(); 8128 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8129 invalidateParentCaches(); 8130 } 8131 8132 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8133 destroyDrawingCache(); 8134 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8135 } 8136 8137 if ((changed & DRAW_MASK) != 0) { 8138 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8139 if (mBackground != null) { 8140 mPrivateFlags &= ~SKIP_DRAW; 8141 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8142 } else { 8143 mPrivateFlags |= SKIP_DRAW; 8144 } 8145 } else { 8146 mPrivateFlags &= ~SKIP_DRAW; 8147 } 8148 requestLayout(); 8149 invalidate(true); 8150 } 8151 8152 if ((changed & KEEP_SCREEN_ON) != 0) { 8153 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8154 mParent.recomputeViewAttributes(this); 8155 } 8156 } 8157 8158 if (AccessibilityManager.getInstance(mContext).isEnabled() 8159 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8160 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8161 notifyAccessibilityStateChanged(); 8162 } 8163 } 8164 8165 /** 8166 * Change the view's z order in the tree, so it's on top of other sibling 8167 * views 8168 */ 8169 public void bringToFront() { 8170 if (mParent != null) { 8171 mParent.bringChildToFront(this); 8172 } 8173 } 8174 8175 /** 8176 * This is called in response to an internal scroll in this view (i.e., the 8177 * view scrolled its own contents). This is typically as a result of 8178 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8179 * called. 8180 * 8181 * @param l Current horizontal scroll origin. 8182 * @param t Current vertical scroll origin. 8183 * @param oldl Previous horizontal scroll origin. 8184 * @param oldt Previous vertical scroll origin. 8185 */ 8186 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8187 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8188 postSendViewScrolledAccessibilityEventCallback(); 8189 } 8190 8191 mBackgroundSizeChanged = true; 8192 8193 final AttachInfo ai = mAttachInfo; 8194 if (ai != null) { 8195 ai.mViewScrollChanged = true; 8196 } 8197 } 8198 8199 /** 8200 * Interface definition for a callback to be invoked when the layout bounds of a view 8201 * changes due to layout processing. 8202 */ 8203 public interface OnLayoutChangeListener { 8204 /** 8205 * Called when the focus state of a view has changed. 8206 * 8207 * @param v The view whose state has changed. 8208 * @param left The new value of the view's left property. 8209 * @param top The new value of the view's top property. 8210 * @param right The new value of the view's right property. 8211 * @param bottom The new value of the view's bottom property. 8212 * @param oldLeft The previous value of the view's left property. 8213 * @param oldTop The previous value of the view's top property. 8214 * @param oldRight The previous value of the view's right property. 8215 * @param oldBottom The previous value of the view's bottom property. 8216 */ 8217 void onLayoutChange(View v, int left, int top, int right, int bottom, 8218 int oldLeft, int oldTop, int oldRight, int oldBottom); 8219 } 8220 8221 /** 8222 * This is called during layout when the size of this view has changed. If 8223 * you were just added to the view hierarchy, you're called with the old 8224 * values of 0. 8225 * 8226 * @param w Current width of this view. 8227 * @param h Current height of this view. 8228 * @param oldw Old width of this view. 8229 * @param oldh Old height of this view. 8230 */ 8231 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8232 } 8233 8234 /** 8235 * Called by draw to draw the child views. This may be overridden 8236 * by derived classes to gain control just before its children are drawn 8237 * (but after its own view has been drawn). 8238 * @param canvas the canvas on which to draw the view 8239 */ 8240 protected void dispatchDraw(Canvas canvas) { 8241 8242 } 8243 8244 /** 8245 * Gets the parent of this view. Note that the parent is a 8246 * ViewParent and not necessarily a View. 8247 * 8248 * @return Parent of this view. 8249 */ 8250 public final ViewParent getParent() { 8251 return mParent; 8252 } 8253 8254 /** 8255 * Set the horizontal scrolled position of your view. This will cause a call to 8256 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8257 * invalidated. 8258 * @param value the x position to scroll to 8259 */ 8260 public void setScrollX(int value) { 8261 scrollTo(value, mScrollY); 8262 } 8263 8264 /** 8265 * Set the vertical scrolled position of your view. This will cause a call to 8266 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8267 * invalidated. 8268 * @param value the y position to scroll to 8269 */ 8270 public void setScrollY(int value) { 8271 scrollTo(mScrollX, value); 8272 } 8273 8274 /** 8275 * Return the scrolled left position of this view. This is the left edge of 8276 * the displayed part of your view. You do not need to draw any pixels 8277 * farther left, since those are outside of the frame of your view on 8278 * screen. 8279 * 8280 * @return The left edge of the displayed part of your view, in pixels. 8281 */ 8282 public final int getScrollX() { 8283 return mScrollX; 8284 } 8285 8286 /** 8287 * Return the scrolled top position of this view. This is the top edge of 8288 * the displayed part of your view. You do not need to draw any pixels above 8289 * it, since those are outside of the frame of your view on screen. 8290 * 8291 * @return The top edge of the displayed part of your view, in pixels. 8292 */ 8293 public final int getScrollY() { 8294 return mScrollY; 8295 } 8296 8297 /** 8298 * Return the width of the your view. 8299 * 8300 * @return The width of your view, in pixels. 8301 */ 8302 @ViewDebug.ExportedProperty(category = "layout") 8303 public final int getWidth() { 8304 return mRight - mLeft; 8305 } 8306 8307 /** 8308 * Return the height of your view. 8309 * 8310 * @return The height of your view, in pixels. 8311 */ 8312 @ViewDebug.ExportedProperty(category = "layout") 8313 public final int getHeight() { 8314 return mBottom - mTop; 8315 } 8316 8317 /** 8318 * Return the visible drawing bounds of your view. Fills in the output 8319 * rectangle with the values from getScrollX(), getScrollY(), 8320 * getWidth(), and getHeight(). 8321 * 8322 * @param outRect The (scrolled) drawing bounds of the view. 8323 */ 8324 public void getDrawingRect(Rect outRect) { 8325 outRect.left = mScrollX; 8326 outRect.top = mScrollY; 8327 outRect.right = mScrollX + (mRight - mLeft); 8328 outRect.bottom = mScrollY + (mBottom - mTop); 8329 } 8330 8331 /** 8332 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8333 * raw width component (that is the result is masked by 8334 * {@link #MEASURED_SIZE_MASK}). 8335 * 8336 * @return The raw measured width of this view. 8337 */ 8338 public final int getMeasuredWidth() { 8339 return mMeasuredWidth & MEASURED_SIZE_MASK; 8340 } 8341 8342 /** 8343 * Return the full width measurement information for this view as computed 8344 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8345 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8346 * This should be used during measurement and layout calculations only. Use 8347 * {@link #getWidth()} to see how wide a view is after layout. 8348 * 8349 * @return The measured width of this view as a bit mask. 8350 */ 8351 public final int getMeasuredWidthAndState() { 8352 return mMeasuredWidth; 8353 } 8354 8355 /** 8356 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8357 * raw width component (that is the result is masked by 8358 * {@link #MEASURED_SIZE_MASK}). 8359 * 8360 * @return The raw measured height of this view. 8361 */ 8362 public final int getMeasuredHeight() { 8363 return mMeasuredHeight & MEASURED_SIZE_MASK; 8364 } 8365 8366 /** 8367 * Return the full height measurement information for this view as computed 8368 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8369 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8370 * This should be used during measurement and layout calculations only. Use 8371 * {@link #getHeight()} to see how wide a view is after layout. 8372 * 8373 * @return The measured width of this view as a bit mask. 8374 */ 8375 public final int getMeasuredHeightAndState() { 8376 return mMeasuredHeight; 8377 } 8378 8379 /** 8380 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8381 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8382 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8383 * and the height component is at the shifted bits 8384 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8385 */ 8386 public final int getMeasuredState() { 8387 return (mMeasuredWidth&MEASURED_STATE_MASK) 8388 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8389 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8390 } 8391 8392 /** 8393 * The transform matrix of this view, which is calculated based on the current 8394 * roation, scale, and pivot properties. 8395 * 8396 * @see #getRotation() 8397 * @see #getScaleX() 8398 * @see #getScaleY() 8399 * @see #getPivotX() 8400 * @see #getPivotY() 8401 * @return The current transform matrix for the view 8402 */ 8403 public Matrix getMatrix() { 8404 if (mTransformationInfo != null) { 8405 updateMatrix(); 8406 return mTransformationInfo.mMatrix; 8407 } 8408 return Matrix.IDENTITY_MATRIX; 8409 } 8410 8411 /** 8412 * Utility function to determine if the value is far enough away from zero to be 8413 * considered non-zero. 8414 * @param value A floating point value to check for zero-ness 8415 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8416 */ 8417 private static boolean nonzero(float value) { 8418 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8419 } 8420 8421 /** 8422 * Returns true if the transform matrix is the identity matrix. 8423 * Recomputes the matrix if necessary. 8424 * 8425 * @return True if the transform matrix is the identity matrix, false otherwise. 8426 */ 8427 final boolean hasIdentityMatrix() { 8428 if (mTransformationInfo != null) { 8429 updateMatrix(); 8430 return mTransformationInfo.mMatrixIsIdentity; 8431 } 8432 return true; 8433 } 8434 8435 void ensureTransformationInfo() { 8436 if (mTransformationInfo == null) { 8437 mTransformationInfo = new TransformationInfo(); 8438 } 8439 } 8440 8441 /** 8442 * Recomputes the transform matrix if necessary. 8443 */ 8444 private void updateMatrix() { 8445 final TransformationInfo info = mTransformationInfo; 8446 if (info == null) { 8447 return; 8448 } 8449 if (info.mMatrixDirty) { 8450 // transform-related properties have changed since the last time someone 8451 // asked for the matrix; recalculate it with the current values 8452 8453 // Figure out if we need to update the pivot point 8454 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8455 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8456 info.mPrevWidth = mRight - mLeft; 8457 info.mPrevHeight = mBottom - mTop; 8458 info.mPivotX = info.mPrevWidth / 2f; 8459 info.mPivotY = info.mPrevHeight / 2f; 8460 } 8461 } 8462 info.mMatrix.reset(); 8463 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8464 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8465 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8466 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8467 } else { 8468 if (info.mCamera == null) { 8469 info.mCamera = new Camera(); 8470 info.matrix3D = new Matrix(); 8471 } 8472 info.mCamera.save(); 8473 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8474 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8475 info.mCamera.getMatrix(info.matrix3D); 8476 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8477 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8478 info.mPivotY + info.mTranslationY); 8479 info.mMatrix.postConcat(info.matrix3D); 8480 info.mCamera.restore(); 8481 } 8482 info.mMatrixDirty = false; 8483 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8484 info.mInverseMatrixDirty = true; 8485 } 8486 } 8487 8488 /** 8489 * Utility method to retrieve the inverse of the current mMatrix property. 8490 * We cache the matrix to avoid recalculating it when transform properties 8491 * have not changed. 8492 * 8493 * @return The inverse of the current matrix of this view. 8494 */ 8495 final Matrix getInverseMatrix() { 8496 final TransformationInfo info = mTransformationInfo; 8497 if (info != null) { 8498 updateMatrix(); 8499 if (info.mInverseMatrixDirty) { 8500 if (info.mInverseMatrix == null) { 8501 info.mInverseMatrix = new Matrix(); 8502 } 8503 info.mMatrix.invert(info.mInverseMatrix); 8504 info.mInverseMatrixDirty = false; 8505 } 8506 return info.mInverseMatrix; 8507 } 8508 return Matrix.IDENTITY_MATRIX; 8509 } 8510 8511 /** 8512 * Gets the distance along the Z axis from the camera to this view. 8513 * 8514 * @see #setCameraDistance(float) 8515 * 8516 * @return The distance along the Z axis. 8517 */ 8518 public float getCameraDistance() { 8519 ensureTransformationInfo(); 8520 final float dpi = mResources.getDisplayMetrics().densityDpi; 8521 final TransformationInfo info = mTransformationInfo; 8522 if (info.mCamera == null) { 8523 info.mCamera = new Camera(); 8524 info.matrix3D = new Matrix(); 8525 } 8526 return -(info.mCamera.getLocationZ() * dpi); 8527 } 8528 8529 /** 8530 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8531 * views are drawn) from the camera to this view. The camera's distance 8532 * affects 3D transformations, for instance rotations around the X and Y 8533 * axis. If the rotationX or rotationY properties are changed and this view is 8534 * large (more than half the size of the screen), it is recommended to always 8535 * use a camera distance that's greater than the height (X axis rotation) or 8536 * the width (Y axis rotation) of this view.</p> 8537 * 8538 * <p>The distance of the camera from the view plane can have an affect on the 8539 * perspective distortion of the view when it is rotated around the x or y axis. 8540 * For example, a large distance will result in a large viewing angle, and there 8541 * will not be much perspective distortion of the view as it rotates. A short 8542 * distance may cause much more perspective distortion upon rotation, and can 8543 * also result in some drawing artifacts if the rotated view ends up partially 8544 * behind the camera (which is why the recommendation is to use a distance at 8545 * least as far as the size of the view, if the view is to be rotated.)</p> 8546 * 8547 * <p>The distance is expressed in "depth pixels." The default distance depends 8548 * on the screen density. For instance, on a medium density display, the 8549 * default distance is 1280. On a high density display, the default distance 8550 * is 1920.</p> 8551 * 8552 * <p>If you want to specify a distance that leads to visually consistent 8553 * results across various densities, use the following formula:</p> 8554 * <pre> 8555 * float scale = context.getResources().getDisplayMetrics().density; 8556 * view.setCameraDistance(distance * scale); 8557 * </pre> 8558 * 8559 * <p>The density scale factor of a high density display is 1.5, 8560 * and 1920 = 1280 * 1.5.</p> 8561 * 8562 * @param distance The distance in "depth pixels", if negative the opposite 8563 * value is used 8564 * 8565 * @see #setRotationX(float) 8566 * @see #setRotationY(float) 8567 */ 8568 public void setCameraDistance(float distance) { 8569 invalidateViewProperty(true, false); 8570 8571 ensureTransformationInfo(); 8572 final float dpi = mResources.getDisplayMetrics().densityDpi; 8573 final TransformationInfo info = mTransformationInfo; 8574 if (info.mCamera == null) { 8575 info.mCamera = new Camera(); 8576 info.matrix3D = new Matrix(); 8577 } 8578 8579 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8580 info.mMatrixDirty = true; 8581 8582 invalidateViewProperty(false, false); 8583 if (mDisplayList != null) { 8584 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8585 } 8586 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8587 // View was rejected last time it was drawn by its parent; this may have changed 8588 invalidateParentIfNeeded(); 8589 } 8590 } 8591 8592 /** 8593 * The degrees that the view is rotated around the pivot point. 8594 * 8595 * @see #setRotation(float) 8596 * @see #getPivotX() 8597 * @see #getPivotY() 8598 * 8599 * @return The degrees of rotation. 8600 */ 8601 @ViewDebug.ExportedProperty(category = "drawing") 8602 public float getRotation() { 8603 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8604 } 8605 8606 /** 8607 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8608 * result in clockwise rotation. 8609 * 8610 * @param rotation The degrees of rotation. 8611 * 8612 * @see #getRotation() 8613 * @see #getPivotX() 8614 * @see #getPivotY() 8615 * @see #setRotationX(float) 8616 * @see #setRotationY(float) 8617 * 8618 * @attr ref android.R.styleable#View_rotation 8619 */ 8620 public void setRotation(float rotation) { 8621 ensureTransformationInfo(); 8622 final TransformationInfo info = mTransformationInfo; 8623 if (info.mRotation != rotation) { 8624 // Double-invalidation is necessary to capture view's old and new areas 8625 invalidateViewProperty(true, false); 8626 info.mRotation = rotation; 8627 info.mMatrixDirty = true; 8628 invalidateViewProperty(false, true); 8629 if (mDisplayList != null) { 8630 mDisplayList.setRotation(rotation); 8631 } 8632 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8633 // View was rejected last time it was drawn by its parent; this may have changed 8634 invalidateParentIfNeeded(); 8635 } 8636 } 8637 } 8638 8639 /** 8640 * The degrees that the view is rotated around the vertical axis through the pivot point. 8641 * 8642 * @see #getPivotX() 8643 * @see #getPivotY() 8644 * @see #setRotationY(float) 8645 * 8646 * @return The degrees of Y rotation. 8647 */ 8648 @ViewDebug.ExportedProperty(category = "drawing") 8649 public float getRotationY() { 8650 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8651 } 8652 8653 /** 8654 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8655 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8656 * down the y axis. 8657 * 8658 * When rotating large views, it is recommended to adjust the camera distance 8659 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8660 * 8661 * @param rotationY The degrees of Y rotation. 8662 * 8663 * @see #getRotationY() 8664 * @see #getPivotX() 8665 * @see #getPivotY() 8666 * @see #setRotation(float) 8667 * @see #setRotationX(float) 8668 * @see #setCameraDistance(float) 8669 * 8670 * @attr ref android.R.styleable#View_rotationY 8671 */ 8672 public void setRotationY(float rotationY) { 8673 ensureTransformationInfo(); 8674 final TransformationInfo info = mTransformationInfo; 8675 if (info.mRotationY != rotationY) { 8676 invalidateViewProperty(true, false); 8677 info.mRotationY = rotationY; 8678 info.mMatrixDirty = true; 8679 invalidateViewProperty(false, true); 8680 if (mDisplayList != null) { 8681 mDisplayList.setRotationY(rotationY); 8682 } 8683 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8684 // View was rejected last time it was drawn by its parent; this may have changed 8685 invalidateParentIfNeeded(); 8686 } 8687 } 8688 } 8689 8690 /** 8691 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8692 * 8693 * @see #getPivotX() 8694 * @see #getPivotY() 8695 * @see #setRotationX(float) 8696 * 8697 * @return The degrees of X rotation. 8698 */ 8699 @ViewDebug.ExportedProperty(category = "drawing") 8700 public float getRotationX() { 8701 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8702 } 8703 8704 /** 8705 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8706 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8707 * x axis. 8708 * 8709 * When rotating large views, it is recommended to adjust the camera distance 8710 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8711 * 8712 * @param rotationX The degrees of X rotation. 8713 * 8714 * @see #getRotationX() 8715 * @see #getPivotX() 8716 * @see #getPivotY() 8717 * @see #setRotation(float) 8718 * @see #setRotationY(float) 8719 * @see #setCameraDistance(float) 8720 * 8721 * @attr ref android.R.styleable#View_rotationX 8722 */ 8723 public void setRotationX(float rotationX) { 8724 ensureTransformationInfo(); 8725 final TransformationInfo info = mTransformationInfo; 8726 if (info.mRotationX != rotationX) { 8727 invalidateViewProperty(true, false); 8728 info.mRotationX = rotationX; 8729 info.mMatrixDirty = true; 8730 invalidateViewProperty(false, true); 8731 if (mDisplayList != null) { 8732 mDisplayList.setRotationX(rotationX); 8733 } 8734 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8735 // View was rejected last time it was drawn by its parent; this may have changed 8736 invalidateParentIfNeeded(); 8737 } 8738 } 8739 } 8740 8741 /** 8742 * The amount that the view is scaled in x around the pivot point, as a proportion of 8743 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8744 * 8745 * <p>By default, this is 1.0f. 8746 * 8747 * @see #getPivotX() 8748 * @see #getPivotY() 8749 * @return The scaling factor. 8750 */ 8751 @ViewDebug.ExportedProperty(category = "drawing") 8752 public float getScaleX() { 8753 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8754 } 8755 8756 /** 8757 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8758 * the view's unscaled width. A value of 1 means that no scaling is applied. 8759 * 8760 * @param scaleX The scaling factor. 8761 * @see #getPivotX() 8762 * @see #getPivotY() 8763 * 8764 * @attr ref android.R.styleable#View_scaleX 8765 */ 8766 public void setScaleX(float scaleX) { 8767 ensureTransformationInfo(); 8768 final TransformationInfo info = mTransformationInfo; 8769 if (info.mScaleX != scaleX) { 8770 invalidateViewProperty(true, false); 8771 info.mScaleX = scaleX; 8772 info.mMatrixDirty = true; 8773 invalidateViewProperty(false, true); 8774 if (mDisplayList != null) { 8775 mDisplayList.setScaleX(scaleX); 8776 } 8777 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8778 // View was rejected last time it was drawn by its parent; this may have changed 8779 invalidateParentIfNeeded(); 8780 } 8781 } 8782 } 8783 8784 /** 8785 * The amount that the view is scaled in y around the pivot point, as a proportion of 8786 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8787 * 8788 * <p>By default, this is 1.0f. 8789 * 8790 * @see #getPivotX() 8791 * @see #getPivotY() 8792 * @return The scaling factor. 8793 */ 8794 @ViewDebug.ExportedProperty(category = "drawing") 8795 public float getScaleY() { 8796 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8797 } 8798 8799 /** 8800 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8801 * the view's unscaled width. A value of 1 means that no scaling is applied. 8802 * 8803 * @param scaleY The scaling factor. 8804 * @see #getPivotX() 8805 * @see #getPivotY() 8806 * 8807 * @attr ref android.R.styleable#View_scaleY 8808 */ 8809 public void setScaleY(float scaleY) { 8810 ensureTransformationInfo(); 8811 final TransformationInfo info = mTransformationInfo; 8812 if (info.mScaleY != scaleY) { 8813 invalidateViewProperty(true, false); 8814 info.mScaleY = scaleY; 8815 info.mMatrixDirty = true; 8816 invalidateViewProperty(false, true); 8817 if (mDisplayList != null) { 8818 mDisplayList.setScaleY(scaleY); 8819 } 8820 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8821 // View was rejected last time it was drawn by its parent; this may have changed 8822 invalidateParentIfNeeded(); 8823 } 8824 } 8825 } 8826 8827 /** 8828 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8829 * and {@link #setScaleX(float) scaled}. 8830 * 8831 * @see #getRotation() 8832 * @see #getScaleX() 8833 * @see #getScaleY() 8834 * @see #getPivotY() 8835 * @return The x location of the pivot point. 8836 * 8837 * @attr ref android.R.styleable#View_transformPivotX 8838 */ 8839 @ViewDebug.ExportedProperty(category = "drawing") 8840 public float getPivotX() { 8841 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8842 } 8843 8844 /** 8845 * Sets the x location of the point around which the view is 8846 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8847 * By default, the pivot point is centered on the object. 8848 * Setting this property disables this behavior and causes the view to use only the 8849 * explicitly set pivotX and pivotY values. 8850 * 8851 * @param pivotX The x location of the pivot point. 8852 * @see #getRotation() 8853 * @see #getScaleX() 8854 * @see #getScaleY() 8855 * @see #getPivotY() 8856 * 8857 * @attr ref android.R.styleable#View_transformPivotX 8858 */ 8859 public void setPivotX(float pivotX) { 8860 ensureTransformationInfo(); 8861 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8862 final TransformationInfo info = mTransformationInfo; 8863 if (info.mPivotX != pivotX) { 8864 invalidateViewProperty(true, false); 8865 info.mPivotX = pivotX; 8866 info.mMatrixDirty = true; 8867 invalidateViewProperty(false, true); 8868 if (mDisplayList != null) { 8869 mDisplayList.setPivotX(pivotX); 8870 } 8871 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8872 // View was rejected last time it was drawn by its parent; this may have changed 8873 invalidateParentIfNeeded(); 8874 } 8875 } 8876 } 8877 8878 /** 8879 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8880 * and {@link #setScaleY(float) scaled}. 8881 * 8882 * @see #getRotation() 8883 * @see #getScaleX() 8884 * @see #getScaleY() 8885 * @see #getPivotY() 8886 * @return The y location of the pivot point. 8887 * 8888 * @attr ref android.R.styleable#View_transformPivotY 8889 */ 8890 @ViewDebug.ExportedProperty(category = "drawing") 8891 public float getPivotY() { 8892 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8893 } 8894 8895 /** 8896 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8897 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8898 * Setting this property disables this behavior and causes the view to use only the 8899 * explicitly set pivotX and pivotY values. 8900 * 8901 * @param pivotY The y location of the pivot point. 8902 * @see #getRotation() 8903 * @see #getScaleX() 8904 * @see #getScaleY() 8905 * @see #getPivotY() 8906 * 8907 * @attr ref android.R.styleable#View_transformPivotY 8908 */ 8909 public void setPivotY(float pivotY) { 8910 ensureTransformationInfo(); 8911 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8912 final TransformationInfo info = mTransformationInfo; 8913 if (info.mPivotY != pivotY) { 8914 invalidateViewProperty(true, false); 8915 info.mPivotY = pivotY; 8916 info.mMatrixDirty = true; 8917 invalidateViewProperty(false, true); 8918 if (mDisplayList != null) { 8919 mDisplayList.setPivotY(pivotY); 8920 } 8921 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8922 // View was rejected last time it was drawn by its parent; this may have changed 8923 invalidateParentIfNeeded(); 8924 } 8925 } 8926 } 8927 8928 /** 8929 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8930 * completely transparent and 1 means the view is completely opaque. 8931 * 8932 * <p>By default this is 1.0f. 8933 * @return The opacity of the view. 8934 */ 8935 @ViewDebug.ExportedProperty(category = "drawing") 8936 public float getAlpha() { 8937 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8938 } 8939 8940 /** 8941 * Returns whether this View has content which overlaps. This function, intended to be 8942 * overridden by specific View types, is an optimization when alpha is set on a view. If 8943 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8944 * and then composited it into place, which can be expensive. If the view has no overlapping 8945 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8946 * An example of overlapping rendering is a TextView with a background image, such as a 8947 * Button. An example of non-overlapping rendering is a TextView with no background, or 8948 * an ImageView with only the foreground image. The default implementation returns true; 8949 * subclasses should override if they have cases which can be optimized. 8950 * 8951 * @return true if the content in this view might overlap, false otherwise. 8952 */ 8953 public boolean hasOverlappingRendering() { 8954 return true; 8955 } 8956 8957 /** 8958 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8959 * completely transparent and 1 means the view is completely opaque.</p> 8960 * 8961 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8962 * responsible for applying the opacity itself. Otherwise, calling this method is 8963 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8964 * setting a hardware layer.</p> 8965 * 8966 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8967 * performance implications. It is generally best to use the alpha property sparingly and 8968 * transiently, as in the case of fading animations.</p> 8969 * 8970 * @param alpha The opacity of the view. 8971 * 8972 * @see #setLayerType(int, android.graphics.Paint) 8973 * 8974 * @attr ref android.R.styleable#View_alpha 8975 */ 8976 public void setAlpha(float alpha) { 8977 ensureTransformationInfo(); 8978 if (mTransformationInfo.mAlpha != alpha) { 8979 mTransformationInfo.mAlpha = alpha; 8980 if (onSetAlpha((int) (alpha * 255))) { 8981 mPrivateFlags |= ALPHA_SET; 8982 // subclass is handling alpha - don't optimize rendering cache invalidation 8983 invalidateParentCaches(); 8984 invalidate(true); 8985 } else { 8986 mPrivateFlags &= ~ALPHA_SET; 8987 invalidateViewProperty(true, false); 8988 if (mDisplayList != null) { 8989 mDisplayList.setAlpha(alpha); 8990 } 8991 } 8992 } 8993 } 8994 8995 /** 8996 * Faster version of setAlpha() which performs the same steps except there are 8997 * no calls to invalidate(). The caller of this function should perform proper invalidation 8998 * on the parent and this object. The return value indicates whether the subclass handles 8999 * alpha (the return value for onSetAlpha()). 9000 * 9001 * @param alpha The new value for the alpha property 9002 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9003 * the new value for the alpha property is different from the old value 9004 */ 9005 boolean setAlphaNoInvalidation(float alpha) { 9006 ensureTransformationInfo(); 9007 if (mTransformationInfo.mAlpha != alpha) { 9008 mTransformationInfo.mAlpha = alpha; 9009 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9010 if (subclassHandlesAlpha) { 9011 mPrivateFlags |= ALPHA_SET; 9012 return true; 9013 } else { 9014 mPrivateFlags &= ~ALPHA_SET; 9015 if (mDisplayList != null) { 9016 mDisplayList.setAlpha(alpha); 9017 } 9018 } 9019 } 9020 return false; 9021 } 9022 9023 /** 9024 * Top position of this view relative to its parent. 9025 * 9026 * @return The top of this view, in pixels. 9027 */ 9028 @ViewDebug.CapturedViewProperty 9029 public final int getTop() { 9030 return mTop; 9031 } 9032 9033 /** 9034 * Sets the top position of this view relative to its parent. This method is meant to be called 9035 * by the layout system and should not generally be called otherwise, because the property 9036 * may be changed at any time by the layout. 9037 * 9038 * @param top The top of this view, in pixels. 9039 */ 9040 public final void setTop(int top) { 9041 if (top != mTop) { 9042 updateMatrix(); 9043 final boolean matrixIsIdentity = mTransformationInfo == null 9044 || mTransformationInfo.mMatrixIsIdentity; 9045 if (matrixIsIdentity) { 9046 if (mAttachInfo != null) { 9047 int minTop; 9048 int yLoc; 9049 if (top < mTop) { 9050 minTop = top; 9051 yLoc = top - mTop; 9052 } else { 9053 minTop = mTop; 9054 yLoc = 0; 9055 } 9056 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9057 } 9058 } else { 9059 // Double-invalidation is necessary to capture view's old and new areas 9060 invalidate(true); 9061 } 9062 9063 int width = mRight - mLeft; 9064 int oldHeight = mBottom - mTop; 9065 9066 mTop = top; 9067 if (mDisplayList != null) { 9068 mDisplayList.setTop(mTop); 9069 } 9070 9071 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9072 9073 if (!matrixIsIdentity) { 9074 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9075 // A change in dimension means an auto-centered pivot point changes, too 9076 mTransformationInfo.mMatrixDirty = true; 9077 } 9078 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9079 invalidate(true); 9080 } 9081 mBackgroundSizeChanged = true; 9082 invalidateParentIfNeeded(); 9083 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9084 // View was rejected last time it was drawn by its parent; this may have changed 9085 invalidateParentIfNeeded(); 9086 } 9087 } 9088 } 9089 9090 /** 9091 * Bottom position of this view relative to its parent. 9092 * 9093 * @return The bottom of this view, in pixels. 9094 */ 9095 @ViewDebug.CapturedViewProperty 9096 public final int getBottom() { 9097 return mBottom; 9098 } 9099 9100 /** 9101 * True if this view has changed since the last time being drawn. 9102 * 9103 * @return The dirty state of this view. 9104 */ 9105 public boolean isDirty() { 9106 return (mPrivateFlags & DIRTY_MASK) != 0; 9107 } 9108 9109 /** 9110 * Sets the bottom position of this view relative to its parent. This method is meant to be 9111 * called by the layout system and should not generally be called otherwise, because the 9112 * property may be changed at any time by the layout. 9113 * 9114 * @param bottom The bottom of this view, in pixels. 9115 */ 9116 public final void setBottom(int bottom) { 9117 if (bottom != mBottom) { 9118 updateMatrix(); 9119 final boolean matrixIsIdentity = mTransformationInfo == null 9120 || mTransformationInfo.mMatrixIsIdentity; 9121 if (matrixIsIdentity) { 9122 if (mAttachInfo != null) { 9123 int maxBottom; 9124 if (bottom < mBottom) { 9125 maxBottom = mBottom; 9126 } else { 9127 maxBottom = bottom; 9128 } 9129 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9130 } 9131 } else { 9132 // Double-invalidation is necessary to capture view's old and new areas 9133 invalidate(true); 9134 } 9135 9136 int width = mRight - mLeft; 9137 int oldHeight = mBottom - mTop; 9138 9139 mBottom = bottom; 9140 if (mDisplayList != null) { 9141 mDisplayList.setBottom(mBottom); 9142 } 9143 9144 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9145 9146 if (!matrixIsIdentity) { 9147 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9148 // A change in dimension means an auto-centered pivot point changes, too 9149 mTransformationInfo.mMatrixDirty = true; 9150 } 9151 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9152 invalidate(true); 9153 } 9154 mBackgroundSizeChanged = true; 9155 invalidateParentIfNeeded(); 9156 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9157 // View was rejected last time it was drawn by its parent; this may have changed 9158 invalidateParentIfNeeded(); 9159 } 9160 } 9161 } 9162 9163 /** 9164 * Left position of this view relative to its parent. 9165 * 9166 * @return The left edge of this view, in pixels. 9167 */ 9168 @ViewDebug.CapturedViewProperty 9169 public final int getLeft() { 9170 return mLeft; 9171 } 9172 9173 /** 9174 * Sets the left position of this view relative to its parent. This method is meant to be called 9175 * by the layout system and should not generally be called otherwise, because the property 9176 * may be changed at any time by the layout. 9177 * 9178 * @param left The bottom of this view, in pixels. 9179 */ 9180 public final void setLeft(int left) { 9181 if (left != mLeft) { 9182 updateMatrix(); 9183 final boolean matrixIsIdentity = mTransformationInfo == null 9184 || mTransformationInfo.mMatrixIsIdentity; 9185 if (matrixIsIdentity) { 9186 if (mAttachInfo != null) { 9187 int minLeft; 9188 int xLoc; 9189 if (left < mLeft) { 9190 minLeft = left; 9191 xLoc = left - mLeft; 9192 } else { 9193 minLeft = mLeft; 9194 xLoc = 0; 9195 } 9196 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9197 } 9198 } else { 9199 // Double-invalidation is necessary to capture view's old and new areas 9200 invalidate(true); 9201 } 9202 9203 int oldWidth = mRight - mLeft; 9204 int height = mBottom - mTop; 9205 9206 mLeft = left; 9207 if (mDisplayList != null) { 9208 mDisplayList.setLeft(left); 9209 } 9210 9211 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9212 9213 if (!matrixIsIdentity) { 9214 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9215 // A change in dimension means an auto-centered pivot point changes, too 9216 mTransformationInfo.mMatrixDirty = true; 9217 } 9218 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9219 invalidate(true); 9220 } 9221 mBackgroundSizeChanged = true; 9222 invalidateParentIfNeeded(); 9223 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9224 // View was rejected last time it was drawn by its parent; this may have changed 9225 invalidateParentIfNeeded(); 9226 } 9227 } 9228 } 9229 9230 /** 9231 * Right position of this view relative to its parent. 9232 * 9233 * @return The right edge of this view, in pixels. 9234 */ 9235 @ViewDebug.CapturedViewProperty 9236 public final int getRight() { 9237 return mRight; 9238 } 9239 9240 /** 9241 * Sets the right position of this view relative to its parent. This method is meant to be called 9242 * by the layout system and should not generally be called otherwise, because the property 9243 * may be changed at any time by the layout. 9244 * 9245 * @param right The bottom of this view, in pixels. 9246 */ 9247 public final void setRight(int right) { 9248 if (right != mRight) { 9249 updateMatrix(); 9250 final boolean matrixIsIdentity = mTransformationInfo == null 9251 || mTransformationInfo.mMatrixIsIdentity; 9252 if (matrixIsIdentity) { 9253 if (mAttachInfo != null) { 9254 int maxRight; 9255 if (right < mRight) { 9256 maxRight = mRight; 9257 } else { 9258 maxRight = right; 9259 } 9260 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9261 } 9262 } else { 9263 // Double-invalidation is necessary to capture view's old and new areas 9264 invalidate(true); 9265 } 9266 9267 int oldWidth = mRight - mLeft; 9268 int height = mBottom - mTop; 9269 9270 mRight = right; 9271 if (mDisplayList != null) { 9272 mDisplayList.setRight(mRight); 9273 } 9274 9275 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9276 9277 if (!matrixIsIdentity) { 9278 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9279 // A change in dimension means an auto-centered pivot point changes, too 9280 mTransformationInfo.mMatrixDirty = true; 9281 } 9282 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9283 invalidate(true); 9284 } 9285 mBackgroundSizeChanged = true; 9286 invalidateParentIfNeeded(); 9287 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9288 // View was rejected last time it was drawn by its parent; this may have changed 9289 invalidateParentIfNeeded(); 9290 } 9291 } 9292 } 9293 9294 /** 9295 * The visual x position of this view, in pixels. This is equivalent to the 9296 * {@link #setTranslationX(float) translationX} property plus the current 9297 * {@link #getLeft() left} property. 9298 * 9299 * @return The visual x position of this view, in pixels. 9300 */ 9301 @ViewDebug.ExportedProperty(category = "drawing") 9302 public float getX() { 9303 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9304 } 9305 9306 /** 9307 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9308 * {@link #setTranslationX(float) translationX} property to be the difference between 9309 * the x value passed in and the current {@link #getLeft() left} property. 9310 * 9311 * @param x The visual x position of this view, in pixels. 9312 */ 9313 public void setX(float x) { 9314 setTranslationX(x - mLeft); 9315 } 9316 9317 /** 9318 * The visual y position of this view, in pixels. This is equivalent to the 9319 * {@link #setTranslationY(float) translationY} property plus the current 9320 * {@link #getTop() top} property. 9321 * 9322 * @return The visual y position of this view, in pixels. 9323 */ 9324 @ViewDebug.ExportedProperty(category = "drawing") 9325 public float getY() { 9326 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9327 } 9328 9329 /** 9330 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9331 * {@link #setTranslationY(float) translationY} property to be the difference between 9332 * the y value passed in and the current {@link #getTop() top} property. 9333 * 9334 * @param y The visual y position of this view, in pixels. 9335 */ 9336 public void setY(float y) { 9337 setTranslationY(y - mTop); 9338 } 9339 9340 9341 /** 9342 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9343 * This position is post-layout, in addition to wherever the object's 9344 * layout placed it. 9345 * 9346 * @return The horizontal position of this view relative to its left position, in pixels. 9347 */ 9348 @ViewDebug.ExportedProperty(category = "drawing") 9349 public float getTranslationX() { 9350 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9351 } 9352 9353 /** 9354 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9355 * This effectively positions the object post-layout, in addition to wherever the object's 9356 * layout placed it. 9357 * 9358 * @param translationX The horizontal position of this view relative to its left position, 9359 * in pixels. 9360 * 9361 * @attr ref android.R.styleable#View_translationX 9362 */ 9363 public void setTranslationX(float translationX) { 9364 ensureTransformationInfo(); 9365 final TransformationInfo info = mTransformationInfo; 9366 if (info.mTranslationX != translationX) { 9367 // Double-invalidation is necessary to capture view's old and new areas 9368 invalidateViewProperty(true, false); 9369 info.mTranslationX = translationX; 9370 info.mMatrixDirty = true; 9371 invalidateViewProperty(false, true); 9372 if (mDisplayList != null) { 9373 mDisplayList.setTranslationX(translationX); 9374 } 9375 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9376 // View was rejected last time it was drawn by its parent; this may have changed 9377 invalidateParentIfNeeded(); 9378 } 9379 } 9380 } 9381 9382 /** 9383 * The horizontal location of this view relative to its {@link #getTop() top} position. 9384 * This position is post-layout, in addition to wherever the object's 9385 * layout placed it. 9386 * 9387 * @return The vertical position of this view relative to its top position, 9388 * in pixels. 9389 */ 9390 @ViewDebug.ExportedProperty(category = "drawing") 9391 public float getTranslationY() { 9392 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9393 } 9394 9395 /** 9396 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9397 * This effectively positions the object post-layout, in addition to wherever the object's 9398 * layout placed it. 9399 * 9400 * @param translationY The vertical position of this view relative to its top position, 9401 * in pixels. 9402 * 9403 * @attr ref android.R.styleable#View_translationY 9404 */ 9405 public void setTranslationY(float translationY) { 9406 ensureTransformationInfo(); 9407 final TransformationInfo info = mTransformationInfo; 9408 if (info.mTranslationY != translationY) { 9409 invalidateViewProperty(true, false); 9410 info.mTranslationY = translationY; 9411 info.mMatrixDirty = true; 9412 invalidateViewProperty(false, true); 9413 if (mDisplayList != null) { 9414 mDisplayList.setTranslationY(translationY); 9415 } 9416 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9417 // View was rejected last time it was drawn by its parent; this may have changed 9418 invalidateParentIfNeeded(); 9419 } 9420 } 9421 } 9422 9423 /** 9424 * Hit rectangle in parent's coordinates 9425 * 9426 * @param outRect The hit rectangle of the view. 9427 */ 9428 public void getHitRect(Rect outRect) { 9429 updateMatrix(); 9430 final TransformationInfo info = mTransformationInfo; 9431 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9432 outRect.set(mLeft, mTop, mRight, mBottom); 9433 } else { 9434 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9435 tmpRect.set(-info.mPivotX, -info.mPivotY, 9436 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9437 info.mMatrix.mapRect(tmpRect); 9438 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9439 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9440 } 9441 } 9442 9443 /** 9444 * Determines whether the given point, in local coordinates is inside the view. 9445 */ 9446 /*package*/ final boolean pointInView(float localX, float localY) { 9447 return localX >= 0 && localX < (mRight - mLeft) 9448 && localY >= 0 && localY < (mBottom - mTop); 9449 } 9450 9451 /** 9452 * Utility method to determine whether the given point, in local coordinates, 9453 * is inside the view, where the area of the view is expanded by the slop factor. 9454 * This method is called while processing touch-move events to determine if the event 9455 * is still within the view. 9456 */ 9457 private boolean pointInView(float localX, float localY, float slop) { 9458 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9459 localY < ((mBottom - mTop) + slop); 9460 } 9461 9462 /** 9463 * When a view has focus and the user navigates away from it, the next view is searched for 9464 * starting from the rectangle filled in by this method. 9465 * 9466 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9467 * of the view. However, if your view maintains some idea of internal selection, 9468 * such as a cursor, or a selected row or column, you should override this method and 9469 * fill in a more specific rectangle. 9470 * 9471 * @param r The rectangle to fill in, in this view's coordinates. 9472 */ 9473 public void getFocusedRect(Rect r) { 9474 getDrawingRect(r); 9475 } 9476 9477 /** 9478 * If some part of this view is not clipped by any of its parents, then 9479 * return that area in r in global (root) coordinates. To convert r to local 9480 * coordinates (without taking possible View rotations into account), offset 9481 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9482 * If the view is completely clipped or translated out, return false. 9483 * 9484 * @param r If true is returned, r holds the global coordinates of the 9485 * visible portion of this view. 9486 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9487 * between this view and its root. globalOffet may be null. 9488 * @return true if r is non-empty (i.e. part of the view is visible at the 9489 * root level. 9490 */ 9491 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9492 int width = mRight - mLeft; 9493 int height = mBottom - mTop; 9494 if (width > 0 && height > 0) { 9495 r.set(0, 0, width, height); 9496 if (globalOffset != null) { 9497 globalOffset.set(-mScrollX, -mScrollY); 9498 } 9499 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9500 } 9501 return false; 9502 } 9503 9504 public final boolean getGlobalVisibleRect(Rect r) { 9505 return getGlobalVisibleRect(r, null); 9506 } 9507 9508 public final boolean getLocalVisibleRect(Rect r) { 9509 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9510 if (getGlobalVisibleRect(r, offset)) { 9511 r.offset(-offset.x, -offset.y); // make r local 9512 return true; 9513 } 9514 return false; 9515 } 9516 9517 /** 9518 * Offset this view's vertical location by the specified number of pixels. 9519 * 9520 * @param offset the number of pixels to offset the view by 9521 */ 9522 public void offsetTopAndBottom(int offset) { 9523 if (offset != 0) { 9524 updateMatrix(); 9525 final boolean matrixIsIdentity = mTransformationInfo == null 9526 || mTransformationInfo.mMatrixIsIdentity; 9527 if (matrixIsIdentity) { 9528 if (mDisplayList != null) { 9529 invalidateViewProperty(false, false); 9530 } else { 9531 final ViewParent p = mParent; 9532 if (p != null && mAttachInfo != null) { 9533 final Rect r = mAttachInfo.mTmpInvalRect; 9534 int minTop; 9535 int maxBottom; 9536 int yLoc; 9537 if (offset < 0) { 9538 minTop = mTop + offset; 9539 maxBottom = mBottom; 9540 yLoc = offset; 9541 } else { 9542 minTop = mTop; 9543 maxBottom = mBottom + offset; 9544 yLoc = 0; 9545 } 9546 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9547 p.invalidateChild(this, r); 9548 } 9549 } 9550 } else { 9551 invalidateViewProperty(false, false); 9552 } 9553 9554 mTop += offset; 9555 mBottom += offset; 9556 if (mDisplayList != null) { 9557 mDisplayList.offsetTopBottom(offset); 9558 invalidateViewProperty(false, false); 9559 } else { 9560 if (!matrixIsIdentity) { 9561 invalidateViewProperty(false, true); 9562 } 9563 invalidateParentIfNeeded(); 9564 } 9565 } 9566 } 9567 9568 /** 9569 * Offset this view's horizontal location by the specified amount of pixels. 9570 * 9571 * @param offset the numer of pixels to offset the view by 9572 */ 9573 public void offsetLeftAndRight(int offset) { 9574 if (offset != 0) { 9575 updateMatrix(); 9576 final boolean matrixIsIdentity = mTransformationInfo == null 9577 || mTransformationInfo.mMatrixIsIdentity; 9578 if (matrixIsIdentity) { 9579 if (mDisplayList != null) { 9580 invalidateViewProperty(false, false); 9581 } else { 9582 final ViewParent p = mParent; 9583 if (p != null && mAttachInfo != null) { 9584 final Rect r = mAttachInfo.mTmpInvalRect; 9585 int minLeft; 9586 int maxRight; 9587 if (offset < 0) { 9588 minLeft = mLeft + offset; 9589 maxRight = mRight; 9590 } else { 9591 minLeft = mLeft; 9592 maxRight = mRight + offset; 9593 } 9594 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9595 p.invalidateChild(this, r); 9596 } 9597 } 9598 } else { 9599 invalidateViewProperty(false, false); 9600 } 9601 9602 mLeft += offset; 9603 mRight += offset; 9604 if (mDisplayList != null) { 9605 mDisplayList.offsetLeftRight(offset); 9606 invalidateViewProperty(false, false); 9607 } else { 9608 if (!matrixIsIdentity) { 9609 invalidateViewProperty(false, true); 9610 } 9611 invalidateParentIfNeeded(); 9612 } 9613 } 9614 } 9615 9616 /** 9617 * Get the LayoutParams associated with this view. All views should have 9618 * layout parameters. These supply parameters to the <i>parent</i> of this 9619 * view specifying how it should be arranged. There are many subclasses of 9620 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9621 * of ViewGroup that are responsible for arranging their children. 9622 * 9623 * This method may return null if this View is not attached to a parent 9624 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9625 * was not invoked successfully. When a View is attached to a parent 9626 * ViewGroup, this method must not return null. 9627 * 9628 * @return The LayoutParams associated with this view, or null if no 9629 * parameters have been set yet 9630 */ 9631 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9632 public ViewGroup.LayoutParams getLayoutParams() { 9633 return mLayoutParams; 9634 } 9635 9636 /** 9637 * Set the layout parameters associated with this view. These supply 9638 * parameters to the <i>parent</i> of this view specifying how it should be 9639 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9640 * correspond to the different subclasses of ViewGroup that are responsible 9641 * for arranging their children. 9642 * 9643 * @param params The layout parameters for this view, cannot be null 9644 */ 9645 public void setLayoutParams(ViewGroup.LayoutParams params) { 9646 if (params == null) { 9647 throw new NullPointerException("Layout parameters cannot be null"); 9648 } 9649 mLayoutParams = params; 9650 if (mParent instanceof ViewGroup) { 9651 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9652 } 9653 requestLayout(); 9654 } 9655 9656 /** 9657 * Set the scrolled position of your view. This will cause a call to 9658 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9659 * invalidated. 9660 * @param x the x position to scroll to 9661 * @param y the y position to scroll to 9662 */ 9663 public void scrollTo(int x, int y) { 9664 if (mScrollX != x || mScrollY != y) { 9665 int oldX = mScrollX; 9666 int oldY = mScrollY; 9667 mScrollX = x; 9668 mScrollY = y; 9669 invalidateParentCaches(); 9670 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9671 if (!awakenScrollBars()) { 9672 postInvalidateOnAnimation(); 9673 } 9674 } 9675 } 9676 9677 /** 9678 * Move the scrolled position of your view. This will cause a call to 9679 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9680 * invalidated. 9681 * @param x the amount of pixels to scroll by horizontally 9682 * @param y the amount of pixels to scroll by vertically 9683 */ 9684 public void scrollBy(int x, int y) { 9685 scrollTo(mScrollX + x, mScrollY + y); 9686 } 9687 9688 /** 9689 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9690 * animation to fade the scrollbars out after a default delay. If a subclass 9691 * provides animated scrolling, the start delay should equal the duration 9692 * of the scrolling animation.</p> 9693 * 9694 * <p>The animation starts only if at least one of the scrollbars is 9695 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9696 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9697 * this method returns true, and false otherwise. If the animation is 9698 * started, this method calls {@link #invalidate()}; in that case the 9699 * caller should not call {@link #invalidate()}.</p> 9700 * 9701 * <p>This method should be invoked every time a subclass directly updates 9702 * the scroll parameters.</p> 9703 * 9704 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9705 * and {@link #scrollTo(int, int)}.</p> 9706 * 9707 * @return true if the animation is played, false otherwise 9708 * 9709 * @see #awakenScrollBars(int) 9710 * @see #scrollBy(int, int) 9711 * @see #scrollTo(int, int) 9712 * @see #isHorizontalScrollBarEnabled() 9713 * @see #isVerticalScrollBarEnabled() 9714 * @see #setHorizontalScrollBarEnabled(boolean) 9715 * @see #setVerticalScrollBarEnabled(boolean) 9716 */ 9717 protected boolean awakenScrollBars() { 9718 return mScrollCache != null && 9719 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9720 } 9721 9722 /** 9723 * Trigger the scrollbars to draw. 9724 * This method differs from awakenScrollBars() only in its default duration. 9725 * initialAwakenScrollBars() will show the scroll bars for longer than 9726 * usual to give the user more of a chance to notice them. 9727 * 9728 * @return true if the animation is played, false otherwise. 9729 */ 9730 private boolean initialAwakenScrollBars() { 9731 return mScrollCache != null && 9732 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9733 } 9734 9735 /** 9736 * <p> 9737 * Trigger the scrollbars to draw. When invoked this method starts an 9738 * animation to fade the scrollbars out after a fixed delay. If a subclass 9739 * provides animated scrolling, the start delay should equal the duration of 9740 * the scrolling animation. 9741 * </p> 9742 * 9743 * <p> 9744 * The animation starts only if at least one of the scrollbars is enabled, 9745 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9746 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9747 * this method returns true, and false otherwise. If the animation is 9748 * started, this method calls {@link #invalidate()}; in that case the caller 9749 * should not call {@link #invalidate()}. 9750 * </p> 9751 * 9752 * <p> 9753 * This method should be invoked everytime a subclass directly updates the 9754 * scroll parameters. 9755 * </p> 9756 * 9757 * @param startDelay the delay, in milliseconds, after which the animation 9758 * should start; when the delay is 0, the animation starts 9759 * immediately 9760 * @return true if the animation is played, false otherwise 9761 * 9762 * @see #scrollBy(int, int) 9763 * @see #scrollTo(int, int) 9764 * @see #isHorizontalScrollBarEnabled() 9765 * @see #isVerticalScrollBarEnabled() 9766 * @see #setHorizontalScrollBarEnabled(boolean) 9767 * @see #setVerticalScrollBarEnabled(boolean) 9768 */ 9769 protected boolean awakenScrollBars(int startDelay) { 9770 return awakenScrollBars(startDelay, true); 9771 } 9772 9773 /** 9774 * <p> 9775 * Trigger the scrollbars to draw. When invoked this method starts an 9776 * animation to fade the scrollbars out after a fixed delay. If a subclass 9777 * provides animated scrolling, the start delay should equal the duration of 9778 * the scrolling animation. 9779 * </p> 9780 * 9781 * <p> 9782 * The animation starts only if at least one of the scrollbars is enabled, 9783 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9784 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9785 * this method returns true, and false otherwise. If the animation is 9786 * started, this method calls {@link #invalidate()} if the invalidate parameter 9787 * is set to true; in that case the caller 9788 * should not call {@link #invalidate()}. 9789 * </p> 9790 * 9791 * <p> 9792 * This method should be invoked everytime a subclass directly updates the 9793 * scroll parameters. 9794 * </p> 9795 * 9796 * @param startDelay the delay, in milliseconds, after which the animation 9797 * should start; when the delay is 0, the animation starts 9798 * immediately 9799 * 9800 * @param invalidate Wheter this method should call invalidate 9801 * 9802 * @return true if the animation is played, false otherwise 9803 * 9804 * @see #scrollBy(int, int) 9805 * @see #scrollTo(int, int) 9806 * @see #isHorizontalScrollBarEnabled() 9807 * @see #isVerticalScrollBarEnabled() 9808 * @see #setHorizontalScrollBarEnabled(boolean) 9809 * @see #setVerticalScrollBarEnabled(boolean) 9810 */ 9811 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9812 final ScrollabilityCache scrollCache = mScrollCache; 9813 9814 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9815 return false; 9816 } 9817 9818 if (scrollCache.scrollBar == null) { 9819 scrollCache.scrollBar = new ScrollBarDrawable(); 9820 } 9821 9822 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9823 9824 if (invalidate) { 9825 // Invalidate to show the scrollbars 9826 postInvalidateOnAnimation(); 9827 } 9828 9829 if (scrollCache.state == ScrollabilityCache.OFF) { 9830 // FIXME: this is copied from WindowManagerService. 9831 // We should get this value from the system when it 9832 // is possible to do so. 9833 final int KEY_REPEAT_FIRST_DELAY = 750; 9834 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9835 } 9836 9837 // Tell mScrollCache when we should start fading. This may 9838 // extend the fade start time if one was already scheduled 9839 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9840 scrollCache.fadeStartTime = fadeStartTime; 9841 scrollCache.state = ScrollabilityCache.ON; 9842 9843 // Schedule our fader to run, unscheduling any old ones first 9844 if (mAttachInfo != null) { 9845 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9846 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9847 } 9848 9849 return true; 9850 } 9851 9852 return false; 9853 } 9854 9855 /** 9856 * Do not invalidate views which are not visible and which are not running an animation. They 9857 * will not get drawn and they should not set dirty flags as if they will be drawn 9858 */ 9859 private boolean skipInvalidate() { 9860 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9861 (!(mParent instanceof ViewGroup) || 9862 !((ViewGroup) mParent).isViewTransitioning(this)); 9863 } 9864 /** 9865 * Mark the area defined by dirty as needing to be drawn. If the view is 9866 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9867 * in the future. This must be called from a UI thread. To call from a non-UI 9868 * thread, call {@link #postInvalidate()}. 9869 * 9870 * WARNING: This method is destructive to dirty. 9871 * @param dirty the rectangle representing the bounds of the dirty region 9872 */ 9873 public void invalidate(Rect dirty) { 9874 if (ViewDebug.TRACE_HIERARCHY) { 9875 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9876 } 9877 9878 if (skipInvalidate()) { 9879 return; 9880 } 9881 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9882 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9883 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9884 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9885 mPrivateFlags |= INVALIDATED; 9886 mPrivateFlags |= DIRTY; 9887 final ViewParent p = mParent; 9888 final AttachInfo ai = mAttachInfo; 9889 //noinspection PointlessBooleanExpression,ConstantConditions 9890 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9891 if (p != null && ai != null && ai.mHardwareAccelerated) { 9892 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9893 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9894 p.invalidateChild(this, null); 9895 return; 9896 } 9897 } 9898 if (p != null && ai != null) { 9899 final int scrollX = mScrollX; 9900 final int scrollY = mScrollY; 9901 final Rect r = ai.mTmpInvalRect; 9902 r.set(dirty.left - scrollX, dirty.top - scrollY, 9903 dirty.right - scrollX, dirty.bottom - scrollY); 9904 mParent.invalidateChild(this, r); 9905 } 9906 } 9907 } 9908 9909 /** 9910 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9911 * The coordinates of the dirty rect are relative to the view. 9912 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9913 * will be called at some point in the future. This must be called from 9914 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9915 * @param l the left position of the dirty region 9916 * @param t the top position of the dirty region 9917 * @param r the right position of the dirty region 9918 * @param b the bottom position of the dirty region 9919 */ 9920 public void invalidate(int l, int t, int r, int b) { 9921 if (ViewDebug.TRACE_HIERARCHY) { 9922 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9923 } 9924 9925 if (skipInvalidate()) { 9926 return; 9927 } 9928 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9929 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9930 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9931 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9932 mPrivateFlags |= INVALIDATED; 9933 mPrivateFlags |= DIRTY; 9934 final ViewParent p = mParent; 9935 final AttachInfo ai = mAttachInfo; 9936 //noinspection PointlessBooleanExpression,ConstantConditions 9937 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9938 if (p != null && ai != null && ai.mHardwareAccelerated) { 9939 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9940 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9941 p.invalidateChild(this, null); 9942 return; 9943 } 9944 } 9945 if (p != null && ai != null && l < r && t < b) { 9946 final int scrollX = mScrollX; 9947 final int scrollY = mScrollY; 9948 final Rect tmpr = ai.mTmpInvalRect; 9949 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9950 p.invalidateChild(this, tmpr); 9951 } 9952 } 9953 } 9954 9955 /** 9956 * Invalidate the whole view. If the view is visible, 9957 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9958 * the future. This must be called from a UI thread. To call from a non-UI thread, 9959 * call {@link #postInvalidate()}. 9960 */ 9961 public void invalidate() { 9962 invalidate(true); 9963 } 9964 9965 /** 9966 * This is where the invalidate() work actually happens. A full invalidate() 9967 * causes the drawing cache to be invalidated, but this function can be called with 9968 * invalidateCache set to false to skip that invalidation step for cases that do not 9969 * need it (for example, a component that remains at the same dimensions with the same 9970 * content). 9971 * 9972 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9973 * well. This is usually true for a full invalidate, but may be set to false if the 9974 * View's contents or dimensions have not changed. 9975 */ 9976 void invalidate(boolean invalidateCache) { 9977 if (ViewDebug.TRACE_HIERARCHY) { 9978 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9979 } 9980 9981 if (skipInvalidate()) { 9982 return; 9983 } 9984 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9985 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9986 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9987 mLastIsOpaque = isOpaque(); 9988 mPrivateFlags &= ~DRAWN; 9989 mPrivateFlags |= DIRTY; 9990 if (invalidateCache) { 9991 mPrivateFlags |= INVALIDATED; 9992 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9993 } 9994 final AttachInfo ai = mAttachInfo; 9995 final ViewParent p = mParent; 9996 //noinspection PointlessBooleanExpression,ConstantConditions 9997 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9998 if (p != null && ai != null && ai.mHardwareAccelerated) { 9999 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10000 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10001 p.invalidateChild(this, null); 10002 return; 10003 } 10004 } 10005 10006 if (p != null && ai != null) { 10007 final Rect r = ai.mTmpInvalRect; 10008 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10009 // Don't call invalidate -- we don't want to internally scroll 10010 // our own bounds 10011 p.invalidateChild(this, r); 10012 } 10013 } 10014 } 10015 10016 /** 10017 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10018 * set any flags or handle all of the cases handled by the default invalidation methods. 10019 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10020 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10021 * walk up the hierarchy, transforming the dirty rect as necessary. 10022 * 10023 * The method also handles normal invalidation logic if display list properties are not 10024 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10025 * backup approach, to handle these cases used in the various property-setting methods. 10026 * 10027 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10028 * are not being used in this view 10029 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10030 * list properties are not being used in this view 10031 */ 10032 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10033 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10034 if (invalidateParent) { 10035 invalidateParentCaches(); 10036 } 10037 if (forceRedraw) { 10038 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10039 } 10040 invalidate(false); 10041 } else { 10042 final AttachInfo ai = mAttachInfo; 10043 final ViewParent p = mParent; 10044 if (p != null && ai != null) { 10045 final Rect r = ai.mTmpInvalRect; 10046 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10047 if (mParent instanceof ViewGroup) { 10048 ((ViewGroup) mParent).invalidateChildFast(this, r); 10049 } else { 10050 mParent.invalidateChild(this, r); 10051 } 10052 } 10053 } 10054 } 10055 10056 /** 10057 * Utility method to transform a given Rect by the current matrix of this view. 10058 */ 10059 void transformRect(final Rect rect) { 10060 if (!getMatrix().isIdentity()) { 10061 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10062 boundingRect.set(rect); 10063 getMatrix().mapRect(boundingRect); 10064 rect.set((int) (boundingRect.left - 0.5f), 10065 (int) (boundingRect.top - 0.5f), 10066 (int) (boundingRect.right + 0.5f), 10067 (int) (boundingRect.bottom + 0.5f)); 10068 } 10069 } 10070 10071 /** 10072 * Used to indicate that the parent of this view should clear its caches. This functionality 10073 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10074 * which is necessary when various parent-managed properties of the view change, such as 10075 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10076 * clears the parent caches and does not causes an invalidate event. 10077 * 10078 * @hide 10079 */ 10080 protected void invalidateParentCaches() { 10081 if (mParent instanceof View) { 10082 ((View) mParent).mPrivateFlags |= INVALIDATED; 10083 } 10084 } 10085 10086 /** 10087 * Used to indicate that the parent of this view should be invalidated. This functionality 10088 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10089 * which is necessary when various parent-managed properties of the view change, such as 10090 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10091 * an invalidation event to the parent. 10092 * 10093 * @hide 10094 */ 10095 protected void invalidateParentIfNeeded() { 10096 if (isHardwareAccelerated() && mParent instanceof View) { 10097 ((View) mParent).invalidate(true); 10098 } 10099 } 10100 10101 /** 10102 * Indicates whether this View is opaque. An opaque View guarantees that it will 10103 * draw all the pixels overlapping its bounds using a fully opaque color. 10104 * 10105 * Subclasses of View should override this method whenever possible to indicate 10106 * whether an instance is opaque. Opaque Views are treated in a special way by 10107 * the View hierarchy, possibly allowing it to perform optimizations during 10108 * invalidate/draw passes. 10109 * 10110 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10111 */ 10112 @ViewDebug.ExportedProperty(category = "drawing") 10113 public boolean isOpaque() { 10114 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10115 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10116 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10117 } 10118 10119 /** 10120 * @hide 10121 */ 10122 protected void computeOpaqueFlags() { 10123 // Opaque if: 10124 // - Has a background 10125 // - Background is opaque 10126 // - Doesn't have scrollbars or scrollbars are inside overlay 10127 10128 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10129 mPrivateFlags |= OPAQUE_BACKGROUND; 10130 } else { 10131 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10132 } 10133 10134 final int flags = mViewFlags; 10135 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10136 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10137 mPrivateFlags |= OPAQUE_SCROLLBARS; 10138 } else { 10139 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10140 } 10141 } 10142 10143 /** 10144 * @hide 10145 */ 10146 protected boolean hasOpaqueScrollbars() { 10147 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10148 } 10149 10150 /** 10151 * @return A handler associated with the thread running the View. This 10152 * handler can be used to pump events in the UI events queue. 10153 */ 10154 public Handler getHandler() { 10155 if (mAttachInfo != null) { 10156 return mAttachInfo.mHandler; 10157 } 10158 return null; 10159 } 10160 10161 /** 10162 * Gets the view root associated with the View. 10163 * @return The view root, or null if none. 10164 * @hide 10165 */ 10166 public ViewRootImpl getViewRootImpl() { 10167 if (mAttachInfo != null) { 10168 return mAttachInfo.mViewRootImpl; 10169 } 10170 return null; 10171 } 10172 10173 /** 10174 * <p>Causes the Runnable to be added to the message queue. 10175 * The runnable will be run on the user interface thread.</p> 10176 * 10177 * <p>This method can be invoked from outside of the UI thread 10178 * only when this View is attached to a window.</p> 10179 * 10180 * @param action The Runnable that will be executed. 10181 * 10182 * @return Returns true if the Runnable was successfully placed in to the 10183 * message queue. Returns false on failure, usually because the 10184 * looper processing the message queue is exiting. 10185 * 10186 * @see #postDelayed 10187 * @see #removeCallbacks 10188 */ 10189 public boolean post(Runnable action) { 10190 final AttachInfo attachInfo = mAttachInfo; 10191 if (attachInfo != null) { 10192 return attachInfo.mHandler.post(action); 10193 } 10194 // Assume that post will succeed later 10195 ViewRootImpl.getRunQueue().post(action); 10196 return true; 10197 } 10198 10199 /** 10200 * <p>Causes the Runnable to be added to the message queue, to be run 10201 * after the specified amount of time elapses. 10202 * The runnable will be run on the user interface thread.</p> 10203 * 10204 * <p>This method can be invoked from outside of the UI thread 10205 * only when this View is attached to a window.</p> 10206 * 10207 * @param action The Runnable that will be executed. 10208 * @param delayMillis The delay (in milliseconds) until the Runnable 10209 * will be executed. 10210 * 10211 * @return true if the Runnable was successfully placed in to the 10212 * message queue. Returns false on failure, usually because the 10213 * looper processing the message queue is exiting. Note that a 10214 * result of true does not mean the Runnable will be processed -- 10215 * if the looper is quit before the delivery time of the message 10216 * occurs then the message will be dropped. 10217 * 10218 * @see #post 10219 * @see #removeCallbacks 10220 */ 10221 public boolean postDelayed(Runnable action, long delayMillis) { 10222 final AttachInfo attachInfo = mAttachInfo; 10223 if (attachInfo != null) { 10224 return attachInfo.mHandler.postDelayed(action, delayMillis); 10225 } 10226 // Assume that post will succeed later 10227 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10228 return true; 10229 } 10230 10231 /** 10232 * <p>Causes the Runnable to execute on the next animation time step. 10233 * The runnable will be run on the user interface thread.</p> 10234 * 10235 * <p>This method can be invoked from outside of the UI thread 10236 * only when this View is attached to a window.</p> 10237 * 10238 * @param action The Runnable that will be executed. 10239 * 10240 * @see #postOnAnimationDelayed 10241 * @see #removeCallbacks 10242 */ 10243 public void postOnAnimation(Runnable action) { 10244 final AttachInfo attachInfo = mAttachInfo; 10245 if (attachInfo != null) { 10246 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10247 Choreographer.CALLBACK_ANIMATION, action, null); 10248 } else { 10249 // Assume that post will succeed later 10250 ViewRootImpl.getRunQueue().post(action); 10251 } 10252 } 10253 10254 /** 10255 * <p>Causes the Runnable to execute on the next animation time step, 10256 * after the specified amount of time elapses. 10257 * The runnable will be run on the user interface thread.</p> 10258 * 10259 * <p>This method can be invoked from outside of the UI thread 10260 * only when this View is attached to a window.</p> 10261 * 10262 * @param action The Runnable that will be executed. 10263 * @param delayMillis The delay (in milliseconds) until the Runnable 10264 * will be executed. 10265 * 10266 * @see #postOnAnimation 10267 * @see #removeCallbacks 10268 */ 10269 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10270 final AttachInfo attachInfo = mAttachInfo; 10271 if (attachInfo != null) { 10272 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10273 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10274 } else { 10275 // Assume that post will succeed later 10276 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10277 } 10278 } 10279 10280 /** 10281 * <p>Removes the specified Runnable from the message queue.</p> 10282 * 10283 * <p>This method can be invoked from outside of the UI thread 10284 * only when this View is attached to a window.</p> 10285 * 10286 * @param action The Runnable to remove from the message handling queue 10287 * 10288 * @return true if this view could ask the Handler to remove the Runnable, 10289 * false otherwise. When the returned value is true, the Runnable 10290 * may or may not have been actually removed from the message queue 10291 * (for instance, if the Runnable was not in the queue already.) 10292 * 10293 * @see #post 10294 * @see #postDelayed 10295 * @see #postOnAnimation 10296 * @see #postOnAnimationDelayed 10297 */ 10298 public boolean removeCallbacks(Runnable action) { 10299 if (action != null) { 10300 final AttachInfo attachInfo = mAttachInfo; 10301 if (attachInfo != null) { 10302 attachInfo.mHandler.removeCallbacks(action); 10303 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10304 Choreographer.CALLBACK_ANIMATION, action, null); 10305 } else { 10306 // Assume that post will succeed later 10307 ViewRootImpl.getRunQueue().removeCallbacks(action); 10308 } 10309 } 10310 return true; 10311 } 10312 10313 /** 10314 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10315 * Use this to invalidate the View from a non-UI thread.</p> 10316 * 10317 * <p>This method can be invoked from outside of the UI thread 10318 * only when this View is attached to a window.</p> 10319 * 10320 * @see #invalidate() 10321 * @see #postInvalidateDelayed(long) 10322 */ 10323 public void postInvalidate() { 10324 postInvalidateDelayed(0); 10325 } 10326 10327 /** 10328 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10329 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10330 * 10331 * <p>This method can be invoked from outside of the UI thread 10332 * only when this View is attached to a window.</p> 10333 * 10334 * @param left The left coordinate of the rectangle to invalidate. 10335 * @param top The top coordinate of the rectangle to invalidate. 10336 * @param right The right coordinate of the rectangle to invalidate. 10337 * @param bottom The bottom coordinate of the rectangle to invalidate. 10338 * 10339 * @see #invalidate(int, int, int, int) 10340 * @see #invalidate(Rect) 10341 * @see #postInvalidateDelayed(long, int, int, int, int) 10342 */ 10343 public void postInvalidate(int left, int top, int right, int bottom) { 10344 postInvalidateDelayed(0, left, top, right, bottom); 10345 } 10346 10347 /** 10348 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10349 * loop. Waits for the specified amount of time.</p> 10350 * 10351 * <p>This method can be invoked from outside of the UI thread 10352 * only when this View is attached to a window.</p> 10353 * 10354 * @param delayMilliseconds the duration in milliseconds to delay the 10355 * invalidation by 10356 * 10357 * @see #invalidate() 10358 * @see #postInvalidate() 10359 */ 10360 public void postInvalidateDelayed(long delayMilliseconds) { 10361 // We try only with the AttachInfo because there's no point in invalidating 10362 // if we are not attached to our window 10363 final AttachInfo attachInfo = mAttachInfo; 10364 if (attachInfo != null) { 10365 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10366 } 10367 } 10368 10369 /** 10370 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10371 * through the event loop. Waits for the specified amount of time.</p> 10372 * 10373 * <p>This method can be invoked from outside of the UI thread 10374 * only when this View is attached to a window.</p> 10375 * 10376 * @param delayMilliseconds the duration in milliseconds to delay the 10377 * invalidation by 10378 * @param left The left coordinate of the rectangle to invalidate. 10379 * @param top The top coordinate of the rectangle to invalidate. 10380 * @param right The right coordinate of the rectangle to invalidate. 10381 * @param bottom The bottom coordinate of the rectangle to invalidate. 10382 * 10383 * @see #invalidate(int, int, int, int) 10384 * @see #invalidate(Rect) 10385 * @see #postInvalidate(int, int, int, int) 10386 */ 10387 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10388 int right, int bottom) { 10389 10390 // We try only with the AttachInfo because there's no point in invalidating 10391 // if we are not attached to our window 10392 final AttachInfo attachInfo = mAttachInfo; 10393 if (attachInfo != null) { 10394 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10395 info.target = this; 10396 info.left = left; 10397 info.top = top; 10398 info.right = right; 10399 info.bottom = bottom; 10400 10401 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10402 } 10403 } 10404 10405 /** 10406 * <p>Cause an invalidate to happen on the next animation time step, typically the 10407 * next display frame.</p> 10408 * 10409 * <p>This method can be invoked from outside of the UI thread 10410 * only when this View is attached to a window.</p> 10411 * 10412 * @see #invalidate() 10413 */ 10414 public void postInvalidateOnAnimation() { 10415 // We try only with the AttachInfo because there's no point in invalidating 10416 // if we are not attached to our window 10417 final AttachInfo attachInfo = mAttachInfo; 10418 if (attachInfo != null) { 10419 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10420 } 10421 } 10422 10423 /** 10424 * <p>Cause an invalidate of the specified area to happen on the next animation 10425 * time step, typically the next display frame.</p> 10426 * 10427 * <p>This method can be invoked from outside of the UI thread 10428 * only when this View is attached to a window.</p> 10429 * 10430 * @param left The left coordinate of the rectangle to invalidate. 10431 * @param top The top coordinate of the rectangle to invalidate. 10432 * @param right The right coordinate of the rectangle to invalidate. 10433 * @param bottom The bottom coordinate of the rectangle to invalidate. 10434 * 10435 * @see #invalidate(int, int, int, int) 10436 * @see #invalidate(Rect) 10437 */ 10438 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10439 // We try only with the AttachInfo because there's no point in invalidating 10440 // if we are not attached to our window 10441 final AttachInfo attachInfo = mAttachInfo; 10442 if (attachInfo != null) { 10443 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10444 info.target = this; 10445 info.left = left; 10446 info.top = top; 10447 info.right = right; 10448 info.bottom = bottom; 10449 10450 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10451 } 10452 } 10453 10454 /** 10455 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10456 * This event is sent at most once every 10457 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10458 */ 10459 private void postSendViewScrolledAccessibilityEventCallback() { 10460 if (mSendViewScrolledAccessibilityEvent == null) { 10461 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10462 } 10463 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10464 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10465 postDelayed(mSendViewScrolledAccessibilityEvent, 10466 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10467 } 10468 } 10469 10470 /** 10471 * Called by a parent to request that a child update its values for mScrollX 10472 * and mScrollY if necessary. This will typically be done if the child is 10473 * animating a scroll using a {@link android.widget.Scroller Scroller} 10474 * object. 10475 */ 10476 public void computeScroll() { 10477 } 10478 10479 /** 10480 * <p>Indicate whether the horizontal edges are faded when the view is 10481 * scrolled horizontally.</p> 10482 * 10483 * @return true if the horizontal edges should are faded on scroll, false 10484 * otherwise 10485 * 10486 * @see #setHorizontalFadingEdgeEnabled(boolean) 10487 * 10488 * @attr ref android.R.styleable#View_requiresFadingEdge 10489 */ 10490 public boolean isHorizontalFadingEdgeEnabled() { 10491 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10492 } 10493 10494 /** 10495 * <p>Define whether the horizontal edges should be faded when this view 10496 * is scrolled horizontally.</p> 10497 * 10498 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10499 * be faded when the view is scrolled 10500 * horizontally 10501 * 10502 * @see #isHorizontalFadingEdgeEnabled() 10503 * 10504 * @attr ref android.R.styleable#View_requiresFadingEdge 10505 */ 10506 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10507 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10508 if (horizontalFadingEdgeEnabled) { 10509 initScrollCache(); 10510 } 10511 10512 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10513 } 10514 } 10515 10516 /** 10517 * <p>Indicate whether the vertical edges are faded when the view is 10518 * scrolled horizontally.</p> 10519 * 10520 * @return true if the vertical edges should are faded on scroll, false 10521 * otherwise 10522 * 10523 * @see #setVerticalFadingEdgeEnabled(boolean) 10524 * 10525 * @attr ref android.R.styleable#View_requiresFadingEdge 10526 */ 10527 public boolean isVerticalFadingEdgeEnabled() { 10528 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10529 } 10530 10531 /** 10532 * <p>Define whether the vertical edges should be faded when this view 10533 * is scrolled vertically.</p> 10534 * 10535 * @param verticalFadingEdgeEnabled true if the vertical edges should 10536 * be faded when the view is scrolled 10537 * vertically 10538 * 10539 * @see #isVerticalFadingEdgeEnabled() 10540 * 10541 * @attr ref android.R.styleable#View_requiresFadingEdge 10542 */ 10543 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10544 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10545 if (verticalFadingEdgeEnabled) { 10546 initScrollCache(); 10547 } 10548 10549 mViewFlags ^= FADING_EDGE_VERTICAL; 10550 } 10551 } 10552 10553 /** 10554 * Returns the strength, or intensity, of the top faded edge. The strength is 10555 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10556 * returns 0.0 or 1.0 but no value in between. 10557 * 10558 * Subclasses should override this method to provide a smoother fade transition 10559 * when scrolling occurs. 10560 * 10561 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10562 */ 10563 protected float getTopFadingEdgeStrength() { 10564 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10565 } 10566 10567 /** 10568 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10569 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10570 * returns 0.0 or 1.0 but no value in between. 10571 * 10572 * Subclasses should override this method to provide a smoother fade transition 10573 * when scrolling occurs. 10574 * 10575 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10576 */ 10577 protected float getBottomFadingEdgeStrength() { 10578 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10579 computeVerticalScrollRange() ? 1.0f : 0.0f; 10580 } 10581 10582 /** 10583 * Returns the strength, or intensity, of the left faded edge. The strength is 10584 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10585 * returns 0.0 or 1.0 but no value in between. 10586 * 10587 * Subclasses should override this method to provide a smoother fade transition 10588 * when scrolling occurs. 10589 * 10590 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10591 */ 10592 protected float getLeftFadingEdgeStrength() { 10593 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10594 } 10595 10596 /** 10597 * Returns the strength, or intensity, of the right faded edge. The strength is 10598 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10599 * returns 0.0 or 1.0 but no value in between. 10600 * 10601 * Subclasses should override this method to provide a smoother fade transition 10602 * when scrolling occurs. 10603 * 10604 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10605 */ 10606 protected float getRightFadingEdgeStrength() { 10607 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10608 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10609 } 10610 10611 /** 10612 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10613 * scrollbar is not drawn by default.</p> 10614 * 10615 * @return true if the horizontal scrollbar should be painted, false 10616 * otherwise 10617 * 10618 * @see #setHorizontalScrollBarEnabled(boolean) 10619 */ 10620 public boolean isHorizontalScrollBarEnabled() { 10621 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10622 } 10623 10624 /** 10625 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10626 * scrollbar is not drawn by default.</p> 10627 * 10628 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10629 * be painted 10630 * 10631 * @see #isHorizontalScrollBarEnabled() 10632 */ 10633 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10634 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10635 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10636 computeOpaqueFlags(); 10637 resolvePadding(); 10638 } 10639 } 10640 10641 /** 10642 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10643 * scrollbar is not drawn by default.</p> 10644 * 10645 * @return true if the vertical scrollbar should be painted, false 10646 * otherwise 10647 * 10648 * @see #setVerticalScrollBarEnabled(boolean) 10649 */ 10650 public boolean isVerticalScrollBarEnabled() { 10651 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10652 } 10653 10654 /** 10655 * <p>Define whether the vertical scrollbar should be drawn or not. The 10656 * scrollbar is not drawn by default.</p> 10657 * 10658 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10659 * be painted 10660 * 10661 * @see #isVerticalScrollBarEnabled() 10662 */ 10663 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10664 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10665 mViewFlags ^= SCROLLBARS_VERTICAL; 10666 computeOpaqueFlags(); 10667 resolvePadding(); 10668 } 10669 } 10670 10671 /** 10672 * @hide 10673 */ 10674 protected void recomputePadding() { 10675 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10676 } 10677 10678 /** 10679 * Define whether scrollbars will fade when the view is not scrolling. 10680 * 10681 * @param fadeScrollbars wheter to enable fading 10682 * 10683 * @attr ref android.R.styleable#View_fadeScrollbars 10684 */ 10685 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10686 initScrollCache(); 10687 final ScrollabilityCache scrollabilityCache = mScrollCache; 10688 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10689 if (fadeScrollbars) { 10690 scrollabilityCache.state = ScrollabilityCache.OFF; 10691 } else { 10692 scrollabilityCache.state = ScrollabilityCache.ON; 10693 } 10694 } 10695 10696 /** 10697 * 10698 * Returns true if scrollbars will fade when this view is not scrolling 10699 * 10700 * @return true if scrollbar fading is enabled 10701 * 10702 * @attr ref android.R.styleable#View_fadeScrollbars 10703 */ 10704 public boolean isScrollbarFadingEnabled() { 10705 return mScrollCache != null && mScrollCache.fadeScrollBars; 10706 } 10707 10708 /** 10709 * 10710 * Returns the delay before scrollbars fade. 10711 * 10712 * @return the delay before scrollbars fade 10713 * 10714 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10715 */ 10716 public int getScrollBarDefaultDelayBeforeFade() { 10717 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10718 mScrollCache.scrollBarDefaultDelayBeforeFade; 10719 } 10720 10721 /** 10722 * Define the delay before scrollbars fade. 10723 * 10724 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10725 * 10726 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10727 */ 10728 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10729 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10730 } 10731 10732 /** 10733 * 10734 * Returns the scrollbar fade duration. 10735 * 10736 * @return the scrollbar fade duration 10737 * 10738 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10739 */ 10740 public int getScrollBarFadeDuration() { 10741 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10742 mScrollCache.scrollBarFadeDuration; 10743 } 10744 10745 /** 10746 * Define the scrollbar fade duration. 10747 * 10748 * @param scrollBarFadeDuration - the scrollbar fade duration 10749 * 10750 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10751 */ 10752 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10753 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10754 } 10755 10756 /** 10757 * 10758 * Returns the scrollbar size. 10759 * 10760 * @return the scrollbar size 10761 * 10762 * @attr ref android.R.styleable#View_scrollbarSize 10763 */ 10764 public int getScrollBarSize() { 10765 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10766 mScrollCache.scrollBarSize; 10767 } 10768 10769 /** 10770 * Define the scrollbar size. 10771 * 10772 * @param scrollBarSize - the scrollbar size 10773 * 10774 * @attr ref android.R.styleable#View_scrollbarSize 10775 */ 10776 public void setScrollBarSize(int scrollBarSize) { 10777 getScrollCache().scrollBarSize = scrollBarSize; 10778 } 10779 10780 /** 10781 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10782 * inset. When inset, they add to the padding of the view. And the scrollbars 10783 * can be drawn inside the padding area or on the edge of the view. For example, 10784 * if a view has a background drawable and you want to draw the scrollbars 10785 * inside the padding specified by the drawable, you can use 10786 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10787 * appear at the edge of the view, ignoring the padding, then you can use 10788 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10789 * @param style the style of the scrollbars. Should be one of 10790 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10791 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10792 * @see #SCROLLBARS_INSIDE_OVERLAY 10793 * @see #SCROLLBARS_INSIDE_INSET 10794 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10795 * @see #SCROLLBARS_OUTSIDE_INSET 10796 * 10797 * @attr ref android.R.styleable#View_scrollbarStyle 10798 */ 10799 public void setScrollBarStyle(int style) { 10800 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10801 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10802 computeOpaqueFlags(); 10803 resolvePadding(); 10804 } 10805 } 10806 10807 /** 10808 * <p>Returns the current scrollbar style.</p> 10809 * @return the current scrollbar style 10810 * @see #SCROLLBARS_INSIDE_OVERLAY 10811 * @see #SCROLLBARS_INSIDE_INSET 10812 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10813 * @see #SCROLLBARS_OUTSIDE_INSET 10814 * 10815 * @attr ref android.R.styleable#View_scrollbarStyle 10816 */ 10817 @ViewDebug.ExportedProperty(mapping = { 10818 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10819 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10820 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10821 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10822 }) 10823 public int getScrollBarStyle() { 10824 return mViewFlags & SCROLLBARS_STYLE_MASK; 10825 } 10826 10827 /** 10828 * <p>Compute the horizontal range that the horizontal scrollbar 10829 * represents.</p> 10830 * 10831 * <p>The range is expressed in arbitrary units that must be the same as the 10832 * units used by {@link #computeHorizontalScrollExtent()} and 10833 * {@link #computeHorizontalScrollOffset()}.</p> 10834 * 10835 * <p>The default range is the drawing width of this view.</p> 10836 * 10837 * @return the total horizontal range represented by the horizontal 10838 * scrollbar 10839 * 10840 * @see #computeHorizontalScrollExtent() 10841 * @see #computeHorizontalScrollOffset() 10842 * @see android.widget.ScrollBarDrawable 10843 */ 10844 protected int computeHorizontalScrollRange() { 10845 return getWidth(); 10846 } 10847 10848 /** 10849 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10850 * within the horizontal range. This value is used to compute the position 10851 * of the thumb within the scrollbar's track.</p> 10852 * 10853 * <p>The range is expressed in arbitrary units that must be the same as the 10854 * units used by {@link #computeHorizontalScrollRange()} and 10855 * {@link #computeHorizontalScrollExtent()}.</p> 10856 * 10857 * <p>The default offset is the scroll offset of this view.</p> 10858 * 10859 * @return the horizontal offset of the scrollbar's thumb 10860 * 10861 * @see #computeHorizontalScrollRange() 10862 * @see #computeHorizontalScrollExtent() 10863 * @see android.widget.ScrollBarDrawable 10864 */ 10865 protected int computeHorizontalScrollOffset() { 10866 return mScrollX; 10867 } 10868 10869 /** 10870 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10871 * within the horizontal range. This value is used to compute the length 10872 * of the thumb within the scrollbar's track.</p> 10873 * 10874 * <p>The range is expressed in arbitrary units that must be the same as the 10875 * units used by {@link #computeHorizontalScrollRange()} and 10876 * {@link #computeHorizontalScrollOffset()}.</p> 10877 * 10878 * <p>The default extent is the drawing width of this view.</p> 10879 * 10880 * @return the horizontal extent of the scrollbar's thumb 10881 * 10882 * @see #computeHorizontalScrollRange() 10883 * @see #computeHorizontalScrollOffset() 10884 * @see android.widget.ScrollBarDrawable 10885 */ 10886 protected int computeHorizontalScrollExtent() { 10887 return getWidth(); 10888 } 10889 10890 /** 10891 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10892 * 10893 * <p>The range is expressed in arbitrary units that must be the same as the 10894 * units used by {@link #computeVerticalScrollExtent()} and 10895 * {@link #computeVerticalScrollOffset()}.</p> 10896 * 10897 * @return the total vertical range represented by the vertical scrollbar 10898 * 10899 * <p>The default range is the drawing height of this view.</p> 10900 * 10901 * @see #computeVerticalScrollExtent() 10902 * @see #computeVerticalScrollOffset() 10903 * @see android.widget.ScrollBarDrawable 10904 */ 10905 protected int computeVerticalScrollRange() { 10906 return getHeight(); 10907 } 10908 10909 /** 10910 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10911 * within the horizontal range. This value is used to compute the position 10912 * of the thumb within the scrollbar's track.</p> 10913 * 10914 * <p>The range is expressed in arbitrary units that must be the same as the 10915 * units used by {@link #computeVerticalScrollRange()} and 10916 * {@link #computeVerticalScrollExtent()}.</p> 10917 * 10918 * <p>The default offset is the scroll offset of this view.</p> 10919 * 10920 * @return the vertical offset of the scrollbar's thumb 10921 * 10922 * @see #computeVerticalScrollRange() 10923 * @see #computeVerticalScrollExtent() 10924 * @see android.widget.ScrollBarDrawable 10925 */ 10926 protected int computeVerticalScrollOffset() { 10927 return mScrollY; 10928 } 10929 10930 /** 10931 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10932 * within the vertical range. This value is used to compute the length 10933 * of the thumb within the scrollbar's track.</p> 10934 * 10935 * <p>The range is expressed in arbitrary units that must be the same as the 10936 * units used by {@link #computeVerticalScrollRange()} and 10937 * {@link #computeVerticalScrollOffset()}.</p> 10938 * 10939 * <p>The default extent is the drawing height of this view.</p> 10940 * 10941 * @return the vertical extent of the scrollbar's thumb 10942 * 10943 * @see #computeVerticalScrollRange() 10944 * @see #computeVerticalScrollOffset() 10945 * @see android.widget.ScrollBarDrawable 10946 */ 10947 protected int computeVerticalScrollExtent() { 10948 return getHeight(); 10949 } 10950 10951 /** 10952 * Check if this view can be scrolled horizontally in a certain direction. 10953 * 10954 * @param direction Negative to check scrolling left, positive to check scrolling right. 10955 * @return true if this view can be scrolled in the specified direction, false otherwise. 10956 */ 10957 public boolean canScrollHorizontally(int direction) { 10958 final int offset = computeHorizontalScrollOffset(); 10959 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10960 if (range == 0) return false; 10961 if (direction < 0) { 10962 return offset > 0; 10963 } else { 10964 return offset < range - 1; 10965 } 10966 } 10967 10968 /** 10969 * Check if this view can be scrolled vertically in a certain direction. 10970 * 10971 * @param direction Negative to check scrolling up, positive to check scrolling down. 10972 * @return true if this view can be scrolled in the specified direction, false otherwise. 10973 */ 10974 public boolean canScrollVertically(int direction) { 10975 final int offset = computeVerticalScrollOffset(); 10976 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10977 if (range == 0) return false; 10978 if (direction < 0) { 10979 return offset > 0; 10980 } else { 10981 return offset < range - 1; 10982 } 10983 } 10984 10985 /** 10986 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10987 * scrollbars are painted only if they have been awakened first.</p> 10988 * 10989 * @param canvas the canvas on which to draw the scrollbars 10990 * 10991 * @see #awakenScrollBars(int) 10992 */ 10993 protected final void onDrawScrollBars(Canvas canvas) { 10994 // scrollbars are drawn only when the animation is running 10995 final ScrollabilityCache cache = mScrollCache; 10996 if (cache != null) { 10997 10998 int state = cache.state; 10999 11000 if (state == ScrollabilityCache.OFF) { 11001 return; 11002 } 11003 11004 boolean invalidate = false; 11005 11006 if (state == ScrollabilityCache.FADING) { 11007 // We're fading -- get our fade interpolation 11008 if (cache.interpolatorValues == null) { 11009 cache.interpolatorValues = new float[1]; 11010 } 11011 11012 float[] values = cache.interpolatorValues; 11013 11014 // Stops the animation if we're done 11015 if (cache.scrollBarInterpolator.timeToValues(values) == 11016 Interpolator.Result.FREEZE_END) { 11017 cache.state = ScrollabilityCache.OFF; 11018 } else { 11019 cache.scrollBar.setAlpha(Math.round(values[0])); 11020 } 11021 11022 // This will make the scroll bars inval themselves after 11023 // drawing. We only want this when we're fading so that 11024 // we prevent excessive redraws 11025 invalidate = true; 11026 } else { 11027 // We're just on -- but we may have been fading before so 11028 // reset alpha 11029 cache.scrollBar.setAlpha(255); 11030 } 11031 11032 11033 final int viewFlags = mViewFlags; 11034 11035 final boolean drawHorizontalScrollBar = 11036 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11037 final boolean drawVerticalScrollBar = 11038 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11039 && !isVerticalScrollBarHidden(); 11040 11041 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11042 final int width = mRight - mLeft; 11043 final int height = mBottom - mTop; 11044 11045 final ScrollBarDrawable scrollBar = cache.scrollBar; 11046 11047 final int scrollX = mScrollX; 11048 final int scrollY = mScrollY; 11049 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11050 11051 int left, top, right, bottom; 11052 11053 if (drawHorizontalScrollBar) { 11054 int size = scrollBar.getSize(false); 11055 if (size <= 0) { 11056 size = cache.scrollBarSize; 11057 } 11058 11059 scrollBar.setParameters(computeHorizontalScrollRange(), 11060 computeHorizontalScrollOffset(), 11061 computeHorizontalScrollExtent(), false); 11062 final int verticalScrollBarGap = drawVerticalScrollBar ? 11063 getVerticalScrollbarWidth() : 0; 11064 top = scrollY + height - size - (mUserPaddingBottom & inside); 11065 left = scrollX + (mPaddingLeft & inside); 11066 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11067 bottom = top + size; 11068 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11069 if (invalidate) { 11070 invalidate(left, top, right, bottom); 11071 } 11072 } 11073 11074 if (drawVerticalScrollBar) { 11075 int size = scrollBar.getSize(true); 11076 if (size <= 0) { 11077 size = cache.scrollBarSize; 11078 } 11079 11080 scrollBar.setParameters(computeVerticalScrollRange(), 11081 computeVerticalScrollOffset(), 11082 computeVerticalScrollExtent(), true); 11083 switch (mVerticalScrollbarPosition) { 11084 default: 11085 case SCROLLBAR_POSITION_DEFAULT: 11086 case SCROLLBAR_POSITION_RIGHT: 11087 left = scrollX + width - size - (mUserPaddingRight & inside); 11088 break; 11089 case SCROLLBAR_POSITION_LEFT: 11090 left = scrollX + (mUserPaddingLeft & inside); 11091 break; 11092 } 11093 top = scrollY + (mPaddingTop & inside); 11094 right = left + size; 11095 bottom = scrollY + height - (mUserPaddingBottom & inside); 11096 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11097 if (invalidate) { 11098 invalidate(left, top, right, bottom); 11099 } 11100 } 11101 } 11102 } 11103 } 11104 11105 /** 11106 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11107 * FastScroller is visible. 11108 * @return whether to temporarily hide the vertical scrollbar 11109 * @hide 11110 */ 11111 protected boolean isVerticalScrollBarHidden() { 11112 return false; 11113 } 11114 11115 /** 11116 * <p>Draw the horizontal scrollbar if 11117 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11118 * 11119 * @param canvas the canvas on which to draw the scrollbar 11120 * @param scrollBar the scrollbar's drawable 11121 * 11122 * @see #isHorizontalScrollBarEnabled() 11123 * @see #computeHorizontalScrollRange() 11124 * @see #computeHorizontalScrollExtent() 11125 * @see #computeHorizontalScrollOffset() 11126 * @see android.widget.ScrollBarDrawable 11127 * @hide 11128 */ 11129 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11130 int l, int t, int r, int b) { 11131 scrollBar.setBounds(l, t, r, b); 11132 scrollBar.draw(canvas); 11133 } 11134 11135 /** 11136 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11137 * returns true.</p> 11138 * 11139 * @param canvas the canvas on which to draw the scrollbar 11140 * @param scrollBar the scrollbar's drawable 11141 * 11142 * @see #isVerticalScrollBarEnabled() 11143 * @see #computeVerticalScrollRange() 11144 * @see #computeVerticalScrollExtent() 11145 * @see #computeVerticalScrollOffset() 11146 * @see android.widget.ScrollBarDrawable 11147 * @hide 11148 */ 11149 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11150 int l, int t, int r, int b) { 11151 scrollBar.setBounds(l, t, r, b); 11152 scrollBar.draw(canvas); 11153 } 11154 11155 /** 11156 * Implement this to do your drawing. 11157 * 11158 * @param canvas the canvas on which the background will be drawn 11159 */ 11160 protected void onDraw(Canvas canvas) { 11161 } 11162 11163 /* 11164 * Caller is responsible for calling requestLayout if necessary. 11165 * (This allows addViewInLayout to not request a new layout.) 11166 */ 11167 void assignParent(ViewParent parent) { 11168 if (mParent == null) { 11169 mParent = parent; 11170 } else if (parent == null) { 11171 mParent = null; 11172 } else { 11173 throw new RuntimeException("view " + this + " being added, but" 11174 + " it already has a parent"); 11175 } 11176 } 11177 11178 /** 11179 * This is called when the view is attached to a window. At this point it 11180 * has a Surface and will start drawing. Note that this function is 11181 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11182 * however it may be called any time before the first onDraw -- including 11183 * before or after {@link #onMeasure(int, int)}. 11184 * 11185 * @see #onDetachedFromWindow() 11186 */ 11187 protected void onAttachedToWindow() { 11188 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11189 mParent.requestTransparentRegion(this); 11190 } 11191 11192 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11193 initialAwakenScrollBars(); 11194 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11195 } 11196 11197 jumpDrawablesToCurrentState(); 11198 11199 // Order is important here: LayoutDirection MUST be resolved before Padding 11200 // and TextDirection 11201 resolveLayoutDirection(); 11202 resolvePadding(); 11203 resolveTextDirection(); 11204 resolveTextAlignment(); 11205 11206 clearAccessibilityFocus(); 11207 if (isFocused()) { 11208 InputMethodManager imm = InputMethodManager.peekInstance(); 11209 imm.focusIn(this); 11210 } 11211 11212 if (mAttachInfo != null && mDisplayList != null) { 11213 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11214 } 11215 } 11216 11217 /** 11218 * @see #onScreenStateChanged(int) 11219 */ 11220 void dispatchScreenStateChanged(int screenState) { 11221 onScreenStateChanged(screenState); 11222 } 11223 11224 /** 11225 * This method is called whenever the state of the screen this view is 11226 * attached to changes. A state change will usually occurs when the screen 11227 * turns on or off (whether it happens automatically or the user does it 11228 * manually.) 11229 * 11230 * @param screenState The new state of the screen. Can be either 11231 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11232 */ 11233 public void onScreenStateChanged(int screenState) { 11234 } 11235 11236 /** 11237 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11238 */ 11239 private boolean hasRtlSupport() { 11240 return mContext.getApplicationInfo().hasRtlSupport(); 11241 } 11242 11243 /** 11244 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11245 * that the parent directionality can and will be resolved before its children. 11246 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11247 */ 11248 public void resolveLayoutDirection() { 11249 // Clear any previous layout direction resolution 11250 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11251 11252 if (hasRtlSupport()) { 11253 // Set resolved depending on layout direction 11254 switch (getLayoutDirection()) { 11255 case LAYOUT_DIRECTION_INHERIT: 11256 // If this is root view, no need to look at parent's layout dir. 11257 if (canResolveLayoutDirection()) { 11258 ViewGroup viewGroup = ((ViewGroup) mParent); 11259 11260 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11261 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11262 } 11263 } else { 11264 // Nothing to do, LTR by default 11265 } 11266 break; 11267 case LAYOUT_DIRECTION_RTL: 11268 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11269 break; 11270 case LAYOUT_DIRECTION_LOCALE: 11271 if(isLayoutDirectionRtl(Locale.getDefault())) { 11272 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11273 } 11274 break; 11275 default: 11276 // Nothing to do, LTR by default 11277 } 11278 } 11279 11280 // Set to resolved 11281 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11282 onResolvedLayoutDirectionChanged(); 11283 // Resolve padding 11284 resolvePadding(); 11285 } 11286 11287 /** 11288 * Called when layout direction has been resolved. 11289 * 11290 * The default implementation does nothing. 11291 */ 11292 public void onResolvedLayoutDirectionChanged() { 11293 } 11294 11295 /** 11296 * Resolve padding depending on layout direction. 11297 */ 11298 public void resolvePadding() { 11299 // If the user specified the absolute padding (either with android:padding or 11300 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11301 // use the default padding or the padding from the background drawable 11302 // (stored at this point in mPadding*) 11303 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11304 switch (resolvedLayoutDirection) { 11305 case LAYOUT_DIRECTION_RTL: 11306 // Start user padding override Right user padding. Otherwise, if Right user 11307 // padding is not defined, use the default Right padding. If Right user padding 11308 // is defined, just use it. 11309 if (mUserPaddingStart >= 0) { 11310 mUserPaddingRight = mUserPaddingStart; 11311 } else if (mUserPaddingRight < 0) { 11312 mUserPaddingRight = mPaddingRight; 11313 } 11314 if (mUserPaddingEnd >= 0) { 11315 mUserPaddingLeft = mUserPaddingEnd; 11316 } else if (mUserPaddingLeft < 0) { 11317 mUserPaddingLeft = mPaddingLeft; 11318 } 11319 break; 11320 case LAYOUT_DIRECTION_LTR: 11321 default: 11322 // Start user padding override Left user padding. Otherwise, if Left user 11323 // padding is not defined, use the default left padding. If Left user padding 11324 // is defined, just use it. 11325 if (mUserPaddingStart >= 0) { 11326 mUserPaddingLeft = mUserPaddingStart; 11327 } else if (mUserPaddingLeft < 0) { 11328 mUserPaddingLeft = mPaddingLeft; 11329 } 11330 if (mUserPaddingEnd >= 0) { 11331 mUserPaddingRight = mUserPaddingEnd; 11332 } else if (mUserPaddingRight < 0) { 11333 mUserPaddingRight = mPaddingRight; 11334 } 11335 } 11336 11337 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11338 11339 if(isPaddingRelative()) { 11340 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11341 } else { 11342 recomputePadding(); 11343 } 11344 onPaddingChanged(resolvedLayoutDirection); 11345 } 11346 11347 /** 11348 * Resolve padding depending on the layout direction. Subclasses that care about 11349 * padding resolution should override this method. The default implementation does 11350 * nothing. 11351 * 11352 * @param layoutDirection the direction of the layout 11353 * 11354 * @see {@link #LAYOUT_DIRECTION_LTR} 11355 * @see {@link #LAYOUT_DIRECTION_RTL} 11356 */ 11357 public void onPaddingChanged(int layoutDirection) { 11358 } 11359 11360 /** 11361 * Check if layout direction resolution can be done. 11362 * 11363 * @return true if layout direction resolution can be done otherwise return false. 11364 */ 11365 public boolean canResolveLayoutDirection() { 11366 switch (getLayoutDirection()) { 11367 case LAYOUT_DIRECTION_INHERIT: 11368 return (mParent != null) && (mParent instanceof ViewGroup); 11369 default: 11370 return true; 11371 } 11372 } 11373 11374 /** 11375 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11376 * when reset is done. 11377 */ 11378 public void resetResolvedLayoutDirection() { 11379 // Reset the current resolved bits 11380 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11381 onResolvedLayoutDirectionReset(); 11382 // Reset also the text direction 11383 resetResolvedTextDirection(); 11384 } 11385 11386 /** 11387 * Called during reset of resolved layout direction. 11388 * 11389 * Subclasses need to override this method to clear cached information that depends on the 11390 * resolved layout direction, or to inform child views that inherit their layout direction. 11391 * 11392 * The default implementation does nothing. 11393 */ 11394 public void onResolvedLayoutDirectionReset() { 11395 } 11396 11397 /** 11398 * Check if a Locale uses an RTL script. 11399 * 11400 * @param locale Locale to check 11401 * @return true if the Locale uses an RTL script. 11402 */ 11403 protected static boolean isLayoutDirectionRtl(Locale locale) { 11404 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11405 } 11406 11407 /** 11408 * This is called when the view is detached from a window. At this point it 11409 * no longer has a surface for drawing. 11410 * 11411 * @see #onAttachedToWindow() 11412 */ 11413 protected void onDetachedFromWindow() { 11414 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11415 11416 removeUnsetPressCallback(); 11417 removeLongPressCallback(); 11418 removePerformClickCallback(); 11419 removeSendViewScrolledAccessibilityEventCallback(); 11420 11421 destroyDrawingCache(); 11422 11423 destroyLayer(false); 11424 11425 if (mAttachInfo != null) { 11426 if (mDisplayList != null) { 11427 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11428 } 11429 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11430 } else { 11431 if (mDisplayList != null) { 11432 // Should never happen 11433 mDisplayList.invalidate(); 11434 } 11435 } 11436 11437 mCurrentAnimation = null; 11438 11439 resetResolvedLayoutDirection(); 11440 resetResolvedTextAlignment(); 11441 resetAccessibilityStateChanged(); 11442 } 11443 11444 /** 11445 * @return The number of times this view has been attached to a window 11446 */ 11447 protected int getWindowAttachCount() { 11448 return mWindowAttachCount; 11449 } 11450 11451 /** 11452 * Retrieve a unique token identifying the window this view is attached to. 11453 * @return Return the window's token for use in 11454 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11455 */ 11456 public IBinder getWindowToken() { 11457 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11458 } 11459 11460 /** 11461 * Retrieve a unique token identifying the top-level "real" window of 11462 * the window that this view is attached to. That is, this is like 11463 * {@link #getWindowToken}, except if the window this view in is a panel 11464 * window (attached to another containing window), then the token of 11465 * the containing window is returned instead. 11466 * 11467 * @return Returns the associated window token, either 11468 * {@link #getWindowToken()} or the containing window's token. 11469 */ 11470 public IBinder getApplicationWindowToken() { 11471 AttachInfo ai = mAttachInfo; 11472 if (ai != null) { 11473 IBinder appWindowToken = ai.mPanelParentWindowToken; 11474 if (appWindowToken == null) { 11475 appWindowToken = ai.mWindowToken; 11476 } 11477 return appWindowToken; 11478 } 11479 return null; 11480 } 11481 11482 /** 11483 * Retrieve private session object this view hierarchy is using to 11484 * communicate with the window manager. 11485 * @return the session object to communicate with the window manager 11486 */ 11487 /*package*/ IWindowSession getWindowSession() { 11488 return mAttachInfo != null ? mAttachInfo.mSession : null; 11489 } 11490 11491 /** 11492 * @param info the {@link android.view.View.AttachInfo} to associated with 11493 * this view 11494 */ 11495 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11496 //System.out.println("Attached! " + this); 11497 mAttachInfo = info; 11498 mWindowAttachCount++; 11499 // We will need to evaluate the drawable state at least once. 11500 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11501 if (mFloatingTreeObserver != null) { 11502 info.mTreeObserver.merge(mFloatingTreeObserver); 11503 mFloatingTreeObserver = null; 11504 } 11505 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11506 mAttachInfo.mScrollContainers.add(this); 11507 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11508 } 11509 performCollectViewAttributes(mAttachInfo, visibility); 11510 onAttachedToWindow(); 11511 11512 ListenerInfo li = mListenerInfo; 11513 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11514 li != null ? li.mOnAttachStateChangeListeners : null; 11515 if (listeners != null && listeners.size() > 0) { 11516 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11517 // perform the dispatching. The iterator is a safe guard against listeners that 11518 // could mutate the list by calling the various add/remove methods. This prevents 11519 // the array from being modified while we iterate it. 11520 for (OnAttachStateChangeListener listener : listeners) { 11521 listener.onViewAttachedToWindow(this); 11522 } 11523 } 11524 11525 int vis = info.mWindowVisibility; 11526 if (vis != GONE) { 11527 onWindowVisibilityChanged(vis); 11528 } 11529 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11530 // If nobody has evaluated the drawable state yet, then do it now. 11531 refreshDrawableState(); 11532 } 11533 } 11534 11535 void dispatchDetachedFromWindow() { 11536 AttachInfo info = mAttachInfo; 11537 if (info != null) { 11538 int vis = info.mWindowVisibility; 11539 if (vis != GONE) { 11540 onWindowVisibilityChanged(GONE); 11541 } 11542 } 11543 11544 onDetachedFromWindow(); 11545 11546 ListenerInfo li = mListenerInfo; 11547 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11548 li != null ? li.mOnAttachStateChangeListeners : null; 11549 if (listeners != null && listeners.size() > 0) { 11550 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11551 // perform the dispatching. The iterator is a safe guard against listeners that 11552 // could mutate the list by calling the various add/remove methods. This prevents 11553 // the array from being modified while we iterate it. 11554 for (OnAttachStateChangeListener listener : listeners) { 11555 listener.onViewDetachedFromWindow(this); 11556 } 11557 } 11558 11559 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11560 mAttachInfo.mScrollContainers.remove(this); 11561 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11562 } 11563 11564 mAttachInfo = null; 11565 } 11566 11567 /** 11568 * Store this view hierarchy's frozen state into the given container. 11569 * 11570 * @param container The SparseArray in which to save the view's state. 11571 * 11572 * @see #restoreHierarchyState(android.util.SparseArray) 11573 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11574 * @see #onSaveInstanceState() 11575 */ 11576 public void saveHierarchyState(SparseArray<Parcelable> container) { 11577 dispatchSaveInstanceState(container); 11578 } 11579 11580 /** 11581 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11582 * this view and its children. May be overridden to modify how freezing happens to a 11583 * view's children; for example, some views may want to not store state for their children. 11584 * 11585 * @param container The SparseArray in which to save the view's state. 11586 * 11587 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11588 * @see #saveHierarchyState(android.util.SparseArray) 11589 * @see #onSaveInstanceState() 11590 */ 11591 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11592 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11593 mPrivateFlags &= ~SAVE_STATE_CALLED; 11594 Parcelable state = onSaveInstanceState(); 11595 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11596 throw new IllegalStateException( 11597 "Derived class did not call super.onSaveInstanceState()"); 11598 } 11599 if (state != null) { 11600 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11601 // + ": " + state); 11602 container.put(mID, state); 11603 } 11604 } 11605 } 11606 11607 /** 11608 * Hook allowing a view to generate a representation of its internal state 11609 * that can later be used to create a new instance with that same state. 11610 * This state should only contain information that is not persistent or can 11611 * not be reconstructed later. For example, you will never store your 11612 * current position on screen because that will be computed again when a 11613 * new instance of the view is placed in its view hierarchy. 11614 * <p> 11615 * Some examples of things you may store here: the current cursor position 11616 * in a text view (but usually not the text itself since that is stored in a 11617 * content provider or other persistent storage), the currently selected 11618 * item in a list view. 11619 * 11620 * @return Returns a Parcelable object containing the view's current dynamic 11621 * state, or null if there is nothing interesting to save. The 11622 * default implementation returns null. 11623 * @see #onRestoreInstanceState(android.os.Parcelable) 11624 * @see #saveHierarchyState(android.util.SparseArray) 11625 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11626 * @see #setSaveEnabled(boolean) 11627 */ 11628 protected Parcelable onSaveInstanceState() { 11629 mPrivateFlags |= SAVE_STATE_CALLED; 11630 return BaseSavedState.EMPTY_STATE; 11631 } 11632 11633 /** 11634 * Restore this view hierarchy's frozen state from the given container. 11635 * 11636 * @param container The SparseArray which holds previously frozen states. 11637 * 11638 * @see #saveHierarchyState(android.util.SparseArray) 11639 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11640 * @see #onRestoreInstanceState(android.os.Parcelable) 11641 */ 11642 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11643 dispatchRestoreInstanceState(container); 11644 } 11645 11646 /** 11647 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11648 * state for this view and its children. May be overridden to modify how restoring 11649 * happens to a view's children; for example, some views may want to not store state 11650 * for their children. 11651 * 11652 * @param container The SparseArray which holds previously saved state. 11653 * 11654 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11655 * @see #restoreHierarchyState(android.util.SparseArray) 11656 * @see #onRestoreInstanceState(android.os.Parcelable) 11657 */ 11658 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11659 if (mID != NO_ID) { 11660 Parcelable state = container.get(mID); 11661 if (state != null) { 11662 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11663 // + ": " + state); 11664 mPrivateFlags &= ~SAVE_STATE_CALLED; 11665 onRestoreInstanceState(state); 11666 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11667 throw new IllegalStateException( 11668 "Derived class did not call super.onRestoreInstanceState()"); 11669 } 11670 } 11671 } 11672 } 11673 11674 /** 11675 * Hook allowing a view to re-apply a representation of its internal state that had previously 11676 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11677 * null state. 11678 * 11679 * @param state The frozen state that had previously been returned by 11680 * {@link #onSaveInstanceState}. 11681 * 11682 * @see #onSaveInstanceState() 11683 * @see #restoreHierarchyState(android.util.SparseArray) 11684 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11685 */ 11686 protected void onRestoreInstanceState(Parcelable state) { 11687 mPrivateFlags |= SAVE_STATE_CALLED; 11688 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11689 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11690 + "received " + state.getClass().toString() + " instead. This usually happens " 11691 + "when two views of different type have the same id in the same hierarchy. " 11692 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11693 + "other views do not use the same id."); 11694 } 11695 } 11696 11697 /** 11698 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11699 * 11700 * @return the drawing start time in milliseconds 11701 */ 11702 public long getDrawingTime() { 11703 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11704 } 11705 11706 /** 11707 * <p>Enables or disables the duplication of the parent's state into this view. When 11708 * duplication is enabled, this view gets its drawable state from its parent rather 11709 * than from its own internal properties.</p> 11710 * 11711 * <p>Note: in the current implementation, setting this property to true after the 11712 * view was added to a ViewGroup might have no effect at all. This property should 11713 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11714 * 11715 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11716 * property is enabled, an exception will be thrown.</p> 11717 * 11718 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11719 * parent, these states should not be affected by this method.</p> 11720 * 11721 * @param enabled True to enable duplication of the parent's drawable state, false 11722 * to disable it. 11723 * 11724 * @see #getDrawableState() 11725 * @see #isDuplicateParentStateEnabled() 11726 */ 11727 public void setDuplicateParentStateEnabled(boolean enabled) { 11728 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11729 } 11730 11731 /** 11732 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11733 * 11734 * @return True if this view's drawable state is duplicated from the parent, 11735 * false otherwise 11736 * 11737 * @see #getDrawableState() 11738 * @see #setDuplicateParentStateEnabled(boolean) 11739 */ 11740 public boolean isDuplicateParentStateEnabled() { 11741 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11742 } 11743 11744 /** 11745 * <p>Specifies the type of layer backing this view. The layer can be 11746 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11747 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11748 * 11749 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11750 * instance that controls how the layer is composed on screen. The following 11751 * properties of the paint are taken into account when composing the layer:</p> 11752 * <ul> 11753 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11754 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11755 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11756 * </ul> 11757 * 11758 * <p>If this view has an alpha value set to < 1.0 by calling 11759 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11760 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11761 * equivalent to setting a hardware layer on this view and providing a paint with 11762 * the desired alpha value.<p> 11763 * 11764 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11765 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11766 * for more information on when and how to use layers.</p> 11767 * 11768 * @param layerType The ype of layer to use with this view, must be one of 11769 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11770 * {@link #LAYER_TYPE_HARDWARE} 11771 * @param paint The paint used to compose the layer. This argument is optional 11772 * and can be null. It is ignored when the layer type is 11773 * {@link #LAYER_TYPE_NONE} 11774 * 11775 * @see #getLayerType() 11776 * @see #LAYER_TYPE_NONE 11777 * @see #LAYER_TYPE_SOFTWARE 11778 * @see #LAYER_TYPE_HARDWARE 11779 * @see #setAlpha(float) 11780 * 11781 * @attr ref android.R.styleable#View_layerType 11782 */ 11783 public void setLayerType(int layerType, Paint paint) { 11784 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11785 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11786 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11787 } 11788 11789 if (layerType == mLayerType) { 11790 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11791 mLayerPaint = paint == null ? new Paint() : paint; 11792 invalidateParentCaches(); 11793 invalidate(true); 11794 } 11795 return; 11796 } 11797 11798 // Destroy any previous software drawing cache if needed 11799 switch (mLayerType) { 11800 case LAYER_TYPE_HARDWARE: 11801 destroyLayer(false); 11802 // fall through - non-accelerated views may use software layer mechanism instead 11803 case LAYER_TYPE_SOFTWARE: 11804 destroyDrawingCache(); 11805 break; 11806 default: 11807 break; 11808 } 11809 11810 mLayerType = layerType; 11811 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11812 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11813 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11814 11815 invalidateParentCaches(); 11816 invalidate(true); 11817 } 11818 11819 /** 11820 * Indicates whether this view has a static layer. A view with layer type 11821 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11822 * dynamic. 11823 */ 11824 boolean hasStaticLayer() { 11825 return true; 11826 } 11827 11828 /** 11829 * Indicates what type of layer is currently associated with this view. By default 11830 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11831 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11832 * for more information on the different types of layers. 11833 * 11834 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11835 * {@link #LAYER_TYPE_HARDWARE} 11836 * 11837 * @see #setLayerType(int, android.graphics.Paint) 11838 * @see #buildLayer() 11839 * @see #LAYER_TYPE_NONE 11840 * @see #LAYER_TYPE_SOFTWARE 11841 * @see #LAYER_TYPE_HARDWARE 11842 */ 11843 public int getLayerType() { 11844 return mLayerType; 11845 } 11846 11847 /** 11848 * Forces this view's layer to be created and this view to be rendered 11849 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11850 * invoking this method will have no effect. 11851 * 11852 * This method can for instance be used to render a view into its layer before 11853 * starting an animation. If this view is complex, rendering into the layer 11854 * before starting the animation will avoid skipping frames. 11855 * 11856 * @throws IllegalStateException If this view is not attached to a window 11857 * 11858 * @see #setLayerType(int, android.graphics.Paint) 11859 */ 11860 public void buildLayer() { 11861 if (mLayerType == LAYER_TYPE_NONE) return; 11862 11863 if (mAttachInfo == null) { 11864 throw new IllegalStateException("This view must be attached to a window first"); 11865 } 11866 11867 switch (mLayerType) { 11868 case LAYER_TYPE_HARDWARE: 11869 if (mAttachInfo.mHardwareRenderer != null && 11870 mAttachInfo.mHardwareRenderer.isEnabled() && 11871 mAttachInfo.mHardwareRenderer.validate()) { 11872 getHardwareLayer(); 11873 } 11874 break; 11875 case LAYER_TYPE_SOFTWARE: 11876 buildDrawingCache(true); 11877 break; 11878 } 11879 } 11880 11881 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11882 void flushLayer() { 11883 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11884 mHardwareLayer.flush(); 11885 } 11886 } 11887 11888 /** 11889 * <p>Returns a hardware layer that can be used to draw this view again 11890 * without executing its draw method.</p> 11891 * 11892 * @return A HardwareLayer ready to render, or null if an error occurred. 11893 */ 11894 HardwareLayer getHardwareLayer() { 11895 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11896 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11897 return null; 11898 } 11899 11900 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11901 11902 final int width = mRight - mLeft; 11903 final int height = mBottom - mTop; 11904 11905 if (width == 0 || height == 0) { 11906 return null; 11907 } 11908 11909 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11910 if (mHardwareLayer == null) { 11911 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11912 width, height, isOpaque()); 11913 mLocalDirtyRect.set(0, 0, width, height); 11914 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11915 mHardwareLayer.resize(width, height); 11916 mLocalDirtyRect.set(0, 0, width, height); 11917 } 11918 11919 // The layer is not valid if the underlying GPU resources cannot be allocated 11920 if (!mHardwareLayer.isValid()) { 11921 return null; 11922 } 11923 11924 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11925 mLocalDirtyRect.setEmpty(); 11926 } 11927 11928 return mHardwareLayer; 11929 } 11930 11931 /** 11932 * Destroys this View's hardware layer if possible. 11933 * 11934 * @return True if the layer was destroyed, false otherwise. 11935 * 11936 * @see #setLayerType(int, android.graphics.Paint) 11937 * @see #LAYER_TYPE_HARDWARE 11938 */ 11939 boolean destroyLayer(boolean valid) { 11940 if (mHardwareLayer != null) { 11941 AttachInfo info = mAttachInfo; 11942 if (info != null && info.mHardwareRenderer != null && 11943 info.mHardwareRenderer.isEnabled() && 11944 (valid || info.mHardwareRenderer.validate())) { 11945 mHardwareLayer.destroy(); 11946 mHardwareLayer = null; 11947 11948 invalidate(true); 11949 invalidateParentCaches(); 11950 } 11951 return true; 11952 } 11953 return false; 11954 } 11955 11956 /** 11957 * Destroys all hardware rendering resources. This method is invoked 11958 * when the system needs to reclaim resources. Upon execution of this 11959 * method, you should free any OpenGL resources created by the view. 11960 * 11961 * Note: you <strong>must</strong> call 11962 * <code>super.destroyHardwareResources()</code> when overriding 11963 * this method. 11964 * 11965 * @hide 11966 */ 11967 protected void destroyHardwareResources() { 11968 destroyLayer(true); 11969 } 11970 11971 /** 11972 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11973 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11974 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11975 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11976 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11977 * null.</p> 11978 * 11979 * <p>Enabling the drawing cache is similar to 11980 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11981 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11982 * drawing cache has no effect on rendering because the system uses a different mechanism 11983 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11984 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11985 * for information on how to enable software and hardware layers.</p> 11986 * 11987 * <p>This API can be used to manually generate 11988 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11989 * {@link #getDrawingCache()}.</p> 11990 * 11991 * @param enabled true to enable the drawing cache, false otherwise 11992 * 11993 * @see #isDrawingCacheEnabled() 11994 * @see #getDrawingCache() 11995 * @see #buildDrawingCache() 11996 * @see #setLayerType(int, android.graphics.Paint) 11997 */ 11998 public void setDrawingCacheEnabled(boolean enabled) { 11999 mCachingFailed = false; 12000 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12001 } 12002 12003 /** 12004 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12005 * 12006 * @return true if the drawing cache is enabled 12007 * 12008 * @see #setDrawingCacheEnabled(boolean) 12009 * @see #getDrawingCache() 12010 */ 12011 @ViewDebug.ExportedProperty(category = "drawing") 12012 public boolean isDrawingCacheEnabled() { 12013 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12014 } 12015 12016 /** 12017 * Debugging utility which recursively outputs the dirty state of a view and its 12018 * descendants. 12019 * 12020 * @hide 12021 */ 12022 @SuppressWarnings({"UnusedDeclaration"}) 12023 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12024 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12025 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12026 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12027 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12028 if (clear) { 12029 mPrivateFlags &= clearMask; 12030 } 12031 if (this instanceof ViewGroup) { 12032 ViewGroup parent = (ViewGroup) this; 12033 final int count = parent.getChildCount(); 12034 for (int i = 0; i < count; i++) { 12035 final View child = parent.getChildAt(i); 12036 child.outputDirtyFlags(indent + " ", clear, clearMask); 12037 } 12038 } 12039 } 12040 12041 /** 12042 * This method is used by ViewGroup to cause its children to restore or recreate their 12043 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12044 * to recreate its own display list, which would happen if it went through the normal 12045 * draw/dispatchDraw mechanisms. 12046 * 12047 * @hide 12048 */ 12049 protected void dispatchGetDisplayList() {} 12050 12051 /** 12052 * A view that is not attached or hardware accelerated cannot create a display list. 12053 * This method checks these conditions and returns the appropriate result. 12054 * 12055 * @return true if view has the ability to create a display list, false otherwise. 12056 * 12057 * @hide 12058 */ 12059 public boolean canHaveDisplayList() { 12060 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12061 } 12062 12063 /** 12064 * @return The HardwareRenderer associated with that view or null if hardware rendering 12065 * is not supported or this this has not been attached to a window. 12066 * 12067 * @hide 12068 */ 12069 public HardwareRenderer getHardwareRenderer() { 12070 if (mAttachInfo != null) { 12071 return mAttachInfo.mHardwareRenderer; 12072 } 12073 return null; 12074 } 12075 12076 /** 12077 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12078 * Otherwise, the same display list will be returned (after having been rendered into 12079 * along the way, depending on the invalidation state of the view). 12080 * 12081 * @param displayList The previous version of this displayList, could be null. 12082 * @param isLayer Whether the requester of the display list is a layer. If so, 12083 * the view will avoid creating a layer inside the resulting display list. 12084 * @return A new or reused DisplayList object. 12085 */ 12086 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12087 if (!canHaveDisplayList()) { 12088 return null; 12089 } 12090 12091 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12092 displayList == null || !displayList.isValid() || 12093 (!isLayer && mRecreateDisplayList))) { 12094 // Don't need to recreate the display list, just need to tell our 12095 // children to restore/recreate theirs 12096 if (displayList != null && displayList.isValid() && 12097 !isLayer && !mRecreateDisplayList) { 12098 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12099 mPrivateFlags &= ~DIRTY_MASK; 12100 dispatchGetDisplayList(); 12101 12102 return displayList; 12103 } 12104 12105 if (!isLayer) { 12106 // If we got here, we're recreating it. Mark it as such to ensure that 12107 // we copy in child display lists into ours in drawChild() 12108 mRecreateDisplayList = true; 12109 } 12110 if (displayList == null) { 12111 final String name = getClass().getSimpleName(); 12112 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12113 // If we're creating a new display list, make sure our parent gets invalidated 12114 // since they will need to recreate their display list to account for this 12115 // new child display list. 12116 invalidateParentCaches(); 12117 } 12118 12119 boolean caching = false; 12120 final HardwareCanvas canvas = displayList.start(); 12121 int width = mRight - mLeft; 12122 int height = mBottom - mTop; 12123 12124 try { 12125 canvas.setViewport(width, height); 12126 // The dirty rect should always be null for a display list 12127 canvas.onPreDraw(null); 12128 int layerType = ( 12129 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12130 getLayerType() : LAYER_TYPE_NONE; 12131 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12132 if (layerType == LAYER_TYPE_HARDWARE) { 12133 final HardwareLayer layer = getHardwareLayer(); 12134 if (layer != null && layer.isValid()) { 12135 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12136 } else { 12137 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12138 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12139 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12140 } 12141 caching = true; 12142 } else { 12143 buildDrawingCache(true); 12144 Bitmap cache = getDrawingCache(true); 12145 if (cache != null) { 12146 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12147 caching = true; 12148 } 12149 } 12150 } else { 12151 12152 computeScroll(); 12153 12154 canvas.translate(-mScrollX, -mScrollY); 12155 if (!isLayer) { 12156 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12157 mPrivateFlags &= ~DIRTY_MASK; 12158 } 12159 12160 // Fast path for layouts with no backgrounds 12161 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12162 dispatchDraw(canvas); 12163 } else { 12164 draw(canvas); 12165 } 12166 } 12167 } finally { 12168 canvas.onPostDraw(); 12169 12170 displayList.end(); 12171 displayList.setCaching(caching); 12172 if (isLayer) { 12173 displayList.setLeftTopRightBottom(0, 0, width, height); 12174 } else { 12175 setDisplayListProperties(displayList); 12176 } 12177 } 12178 } else if (!isLayer) { 12179 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12180 mPrivateFlags &= ~DIRTY_MASK; 12181 } 12182 12183 return displayList; 12184 } 12185 12186 /** 12187 * Get the DisplayList for the HardwareLayer 12188 * 12189 * @param layer The HardwareLayer whose DisplayList we want 12190 * @return A DisplayList fopr the specified HardwareLayer 12191 */ 12192 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12193 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12194 layer.setDisplayList(displayList); 12195 return displayList; 12196 } 12197 12198 12199 /** 12200 * <p>Returns a display list that can be used to draw this view again 12201 * without executing its draw method.</p> 12202 * 12203 * @return A DisplayList ready to replay, or null if caching is not enabled. 12204 * 12205 * @hide 12206 */ 12207 public DisplayList getDisplayList() { 12208 mDisplayList = getDisplayList(mDisplayList, false); 12209 return mDisplayList; 12210 } 12211 12212 /** 12213 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12214 * 12215 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12216 * 12217 * @see #getDrawingCache(boolean) 12218 */ 12219 public Bitmap getDrawingCache() { 12220 return getDrawingCache(false); 12221 } 12222 12223 /** 12224 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12225 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12226 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12227 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12228 * request the drawing cache by calling this method and draw it on screen if the 12229 * returned bitmap is not null.</p> 12230 * 12231 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12232 * this method will create a bitmap of the same size as this view. Because this bitmap 12233 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12234 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12235 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12236 * size than the view. This implies that your application must be able to handle this 12237 * size.</p> 12238 * 12239 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12240 * the current density of the screen when the application is in compatibility 12241 * mode. 12242 * 12243 * @return A bitmap representing this view or null if cache is disabled. 12244 * 12245 * @see #setDrawingCacheEnabled(boolean) 12246 * @see #isDrawingCacheEnabled() 12247 * @see #buildDrawingCache(boolean) 12248 * @see #destroyDrawingCache() 12249 */ 12250 public Bitmap getDrawingCache(boolean autoScale) { 12251 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12252 return null; 12253 } 12254 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12255 buildDrawingCache(autoScale); 12256 } 12257 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12258 } 12259 12260 /** 12261 * <p>Frees the resources used by the drawing cache. If you call 12262 * {@link #buildDrawingCache()} manually without calling 12263 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12264 * should cleanup the cache with this method afterwards.</p> 12265 * 12266 * @see #setDrawingCacheEnabled(boolean) 12267 * @see #buildDrawingCache() 12268 * @see #getDrawingCache() 12269 */ 12270 public void destroyDrawingCache() { 12271 if (mDrawingCache != null) { 12272 mDrawingCache.recycle(); 12273 mDrawingCache = null; 12274 } 12275 if (mUnscaledDrawingCache != null) { 12276 mUnscaledDrawingCache.recycle(); 12277 mUnscaledDrawingCache = null; 12278 } 12279 } 12280 12281 /** 12282 * Setting a solid background color for the drawing cache's bitmaps will improve 12283 * performance and memory usage. Note, though that this should only be used if this 12284 * view will always be drawn on top of a solid color. 12285 * 12286 * @param color The background color to use for the drawing cache's bitmap 12287 * 12288 * @see #setDrawingCacheEnabled(boolean) 12289 * @see #buildDrawingCache() 12290 * @see #getDrawingCache() 12291 */ 12292 public void setDrawingCacheBackgroundColor(int color) { 12293 if (color != mDrawingCacheBackgroundColor) { 12294 mDrawingCacheBackgroundColor = color; 12295 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12296 } 12297 } 12298 12299 /** 12300 * @see #setDrawingCacheBackgroundColor(int) 12301 * 12302 * @return The background color to used for the drawing cache's bitmap 12303 */ 12304 public int getDrawingCacheBackgroundColor() { 12305 return mDrawingCacheBackgroundColor; 12306 } 12307 12308 /** 12309 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12310 * 12311 * @see #buildDrawingCache(boolean) 12312 */ 12313 public void buildDrawingCache() { 12314 buildDrawingCache(false); 12315 } 12316 12317 /** 12318 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12319 * 12320 * <p>If you call {@link #buildDrawingCache()} manually without calling 12321 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12322 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12323 * 12324 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12325 * this method will create a bitmap of the same size as this view. Because this bitmap 12326 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12327 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12328 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12329 * size than the view. This implies that your application must be able to handle this 12330 * size.</p> 12331 * 12332 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12333 * you do not need the drawing cache bitmap, calling this method will increase memory 12334 * usage and cause the view to be rendered in software once, thus negatively impacting 12335 * performance.</p> 12336 * 12337 * @see #getDrawingCache() 12338 * @see #destroyDrawingCache() 12339 */ 12340 public void buildDrawingCache(boolean autoScale) { 12341 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12342 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12343 mCachingFailed = false; 12344 12345 if (ViewDebug.TRACE_HIERARCHY) { 12346 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12347 } 12348 12349 int width = mRight - mLeft; 12350 int height = mBottom - mTop; 12351 12352 final AttachInfo attachInfo = mAttachInfo; 12353 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12354 12355 if (autoScale && scalingRequired) { 12356 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12357 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12358 } 12359 12360 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12361 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12362 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12363 12364 if (width <= 0 || height <= 0 || 12365 // Projected bitmap size in bytes 12366 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12367 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12368 destroyDrawingCache(); 12369 mCachingFailed = true; 12370 return; 12371 } 12372 12373 boolean clear = true; 12374 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12375 12376 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12377 Bitmap.Config quality; 12378 if (!opaque) { 12379 // Never pick ARGB_4444 because it looks awful 12380 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12381 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12382 case DRAWING_CACHE_QUALITY_AUTO: 12383 quality = Bitmap.Config.ARGB_8888; 12384 break; 12385 case DRAWING_CACHE_QUALITY_LOW: 12386 quality = Bitmap.Config.ARGB_8888; 12387 break; 12388 case DRAWING_CACHE_QUALITY_HIGH: 12389 quality = Bitmap.Config.ARGB_8888; 12390 break; 12391 default: 12392 quality = Bitmap.Config.ARGB_8888; 12393 break; 12394 } 12395 } else { 12396 // Optimization for translucent windows 12397 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12398 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12399 } 12400 12401 // Try to cleanup memory 12402 if (bitmap != null) bitmap.recycle(); 12403 12404 try { 12405 bitmap = Bitmap.createBitmap(width, height, quality); 12406 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12407 if (autoScale) { 12408 mDrawingCache = bitmap; 12409 } else { 12410 mUnscaledDrawingCache = bitmap; 12411 } 12412 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12413 } catch (OutOfMemoryError e) { 12414 // If there is not enough memory to create the bitmap cache, just 12415 // ignore the issue as bitmap caches are not required to draw the 12416 // view hierarchy 12417 if (autoScale) { 12418 mDrawingCache = null; 12419 } else { 12420 mUnscaledDrawingCache = null; 12421 } 12422 mCachingFailed = true; 12423 return; 12424 } 12425 12426 clear = drawingCacheBackgroundColor != 0; 12427 } 12428 12429 Canvas canvas; 12430 if (attachInfo != null) { 12431 canvas = attachInfo.mCanvas; 12432 if (canvas == null) { 12433 canvas = new Canvas(); 12434 } 12435 canvas.setBitmap(bitmap); 12436 // Temporarily clobber the cached Canvas in case one of our children 12437 // is also using a drawing cache. Without this, the children would 12438 // steal the canvas by attaching their own bitmap to it and bad, bad 12439 // thing would happen (invisible views, corrupted drawings, etc.) 12440 attachInfo.mCanvas = null; 12441 } else { 12442 // This case should hopefully never or seldom happen 12443 canvas = new Canvas(bitmap); 12444 } 12445 12446 if (clear) { 12447 bitmap.eraseColor(drawingCacheBackgroundColor); 12448 } 12449 12450 computeScroll(); 12451 final int restoreCount = canvas.save(); 12452 12453 if (autoScale && scalingRequired) { 12454 final float scale = attachInfo.mApplicationScale; 12455 canvas.scale(scale, scale); 12456 } 12457 12458 canvas.translate(-mScrollX, -mScrollY); 12459 12460 mPrivateFlags |= DRAWN; 12461 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12462 mLayerType != LAYER_TYPE_NONE) { 12463 mPrivateFlags |= DRAWING_CACHE_VALID; 12464 } 12465 12466 // Fast path for layouts with no backgrounds 12467 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12468 if (ViewDebug.TRACE_HIERARCHY) { 12469 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12470 } 12471 mPrivateFlags &= ~DIRTY_MASK; 12472 dispatchDraw(canvas); 12473 } else { 12474 draw(canvas); 12475 } 12476 12477 canvas.restoreToCount(restoreCount); 12478 canvas.setBitmap(null); 12479 12480 if (attachInfo != null) { 12481 // Restore the cached Canvas for our siblings 12482 attachInfo.mCanvas = canvas; 12483 } 12484 } 12485 } 12486 12487 /** 12488 * Create a snapshot of the view into a bitmap. We should probably make 12489 * some form of this public, but should think about the API. 12490 */ 12491 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12492 int width = mRight - mLeft; 12493 int height = mBottom - mTop; 12494 12495 final AttachInfo attachInfo = mAttachInfo; 12496 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12497 width = (int) ((width * scale) + 0.5f); 12498 height = (int) ((height * scale) + 0.5f); 12499 12500 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12501 if (bitmap == null) { 12502 throw new OutOfMemoryError(); 12503 } 12504 12505 Resources resources = getResources(); 12506 if (resources != null) { 12507 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12508 } 12509 12510 Canvas canvas; 12511 if (attachInfo != null) { 12512 canvas = attachInfo.mCanvas; 12513 if (canvas == null) { 12514 canvas = new Canvas(); 12515 } 12516 canvas.setBitmap(bitmap); 12517 // Temporarily clobber the cached Canvas in case one of our children 12518 // is also using a drawing cache. Without this, the children would 12519 // steal the canvas by attaching their own bitmap to it and bad, bad 12520 // things would happen (invisible views, corrupted drawings, etc.) 12521 attachInfo.mCanvas = null; 12522 } else { 12523 // This case should hopefully never or seldom happen 12524 canvas = new Canvas(bitmap); 12525 } 12526 12527 if ((backgroundColor & 0xff000000) != 0) { 12528 bitmap.eraseColor(backgroundColor); 12529 } 12530 12531 computeScroll(); 12532 final int restoreCount = canvas.save(); 12533 canvas.scale(scale, scale); 12534 canvas.translate(-mScrollX, -mScrollY); 12535 12536 // Temporarily remove the dirty mask 12537 int flags = mPrivateFlags; 12538 mPrivateFlags &= ~DIRTY_MASK; 12539 12540 // Fast path for layouts with no backgrounds 12541 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12542 dispatchDraw(canvas); 12543 } else { 12544 draw(canvas); 12545 } 12546 12547 mPrivateFlags = flags; 12548 12549 canvas.restoreToCount(restoreCount); 12550 canvas.setBitmap(null); 12551 12552 if (attachInfo != null) { 12553 // Restore the cached Canvas for our siblings 12554 attachInfo.mCanvas = canvas; 12555 } 12556 12557 return bitmap; 12558 } 12559 12560 /** 12561 * Indicates whether this View is currently in edit mode. A View is usually 12562 * in edit mode when displayed within a developer tool. For instance, if 12563 * this View is being drawn by a visual user interface builder, this method 12564 * should return true. 12565 * 12566 * Subclasses should check the return value of this method to provide 12567 * different behaviors if their normal behavior might interfere with the 12568 * host environment. For instance: the class spawns a thread in its 12569 * constructor, the drawing code relies on device-specific features, etc. 12570 * 12571 * This method is usually checked in the drawing code of custom widgets. 12572 * 12573 * @return True if this View is in edit mode, false otherwise. 12574 */ 12575 public boolean isInEditMode() { 12576 return false; 12577 } 12578 12579 /** 12580 * If the View draws content inside its padding and enables fading edges, 12581 * it needs to support padding offsets. Padding offsets are added to the 12582 * fading edges to extend the length of the fade so that it covers pixels 12583 * drawn inside the padding. 12584 * 12585 * Subclasses of this class should override this method if they need 12586 * to draw content inside the padding. 12587 * 12588 * @return True if padding offset must be applied, false otherwise. 12589 * 12590 * @see #getLeftPaddingOffset() 12591 * @see #getRightPaddingOffset() 12592 * @see #getTopPaddingOffset() 12593 * @see #getBottomPaddingOffset() 12594 * 12595 * @since CURRENT 12596 */ 12597 protected boolean isPaddingOffsetRequired() { 12598 return false; 12599 } 12600 12601 /** 12602 * Amount by which to extend the left fading region. Called only when 12603 * {@link #isPaddingOffsetRequired()} returns true. 12604 * 12605 * @return The left padding offset in pixels. 12606 * 12607 * @see #isPaddingOffsetRequired() 12608 * 12609 * @since CURRENT 12610 */ 12611 protected int getLeftPaddingOffset() { 12612 return 0; 12613 } 12614 12615 /** 12616 * Amount by which to extend the right fading region. Called only when 12617 * {@link #isPaddingOffsetRequired()} returns true. 12618 * 12619 * @return The right padding offset in pixels. 12620 * 12621 * @see #isPaddingOffsetRequired() 12622 * 12623 * @since CURRENT 12624 */ 12625 protected int getRightPaddingOffset() { 12626 return 0; 12627 } 12628 12629 /** 12630 * Amount by which to extend the top fading region. Called only when 12631 * {@link #isPaddingOffsetRequired()} returns true. 12632 * 12633 * @return The top padding offset in pixels. 12634 * 12635 * @see #isPaddingOffsetRequired() 12636 * 12637 * @since CURRENT 12638 */ 12639 protected int getTopPaddingOffset() { 12640 return 0; 12641 } 12642 12643 /** 12644 * Amount by which to extend the bottom fading region. Called only when 12645 * {@link #isPaddingOffsetRequired()} returns true. 12646 * 12647 * @return The bottom padding offset in pixels. 12648 * 12649 * @see #isPaddingOffsetRequired() 12650 * 12651 * @since CURRENT 12652 */ 12653 protected int getBottomPaddingOffset() { 12654 return 0; 12655 } 12656 12657 /** 12658 * @hide 12659 * @param offsetRequired 12660 */ 12661 protected int getFadeTop(boolean offsetRequired) { 12662 int top = mPaddingTop; 12663 if (offsetRequired) top += getTopPaddingOffset(); 12664 return top; 12665 } 12666 12667 /** 12668 * @hide 12669 * @param offsetRequired 12670 */ 12671 protected int getFadeHeight(boolean offsetRequired) { 12672 int padding = mPaddingTop; 12673 if (offsetRequired) padding += getTopPaddingOffset(); 12674 return mBottom - mTop - mPaddingBottom - padding; 12675 } 12676 12677 /** 12678 * <p>Indicates whether this view is attached to a hardware accelerated 12679 * window or not.</p> 12680 * 12681 * <p>Even if this method returns true, it does not mean that every call 12682 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12683 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12684 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12685 * window is hardware accelerated, 12686 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12687 * return false, and this method will return true.</p> 12688 * 12689 * @return True if the view is attached to a window and the window is 12690 * hardware accelerated; false in any other case. 12691 */ 12692 public boolean isHardwareAccelerated() { 12693 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12694 } 12695 12696 /** 12697 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12698 * case of an active Animation being run on the view. 12699 */ 12700 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12701 Animation a, boolean scalingRequired) { 12702 Transformation invalidationTransform; 12703 final int flags = parent.mGroupFlags; 12704 final boolean initialized = a.isInitialized(); 12705 if (!initialized) { 12706 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12707 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12708 onAnimationStart(); 12709 } 12710 12711 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12712 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12713 if (parent.mInvalidationTransformation == null) { 12714 parent.mInvalidationTransformation = new Transformation(); 12715 } 12716 invalidationTransform = parent.mInvalidationTransformation; 12717 a.getTransformation(drawingTime, invalidationTransform, 1f); 12718 } else { 12719 invalidationTransform = parent.mChildTransformation; 12720 } 12721 if (more) { 12722 if (!a.willChangeBounds()) { 12723 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12724 parent.FLAG_OPTIMIZE_INVALIDATE) { 12725 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12726 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12727 // The child need to draw an animation, potentially offscreen, so 12728 // make sure we do not cancel invalidate requests 12729 parent.mPrivateFlags |= DRAW_ANIMATION; 12730 parent.invalidate(mLeft, mTop, mRight, mBottom); 12731 } 12732 } else { 12733 if (parent.mInvalidateRegion == null) { 12734 parent.mInvalidateRegion = new RectF(); 12735 } 12736 final RectF region = parent.mInvalidateRegion; 12737 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12738 invalidationTransform); 12739 12740 // The child need to draw an animation, potentially offscreen, so 12741 // make sure we do not cancel invalidate requests 12742 parent.mPrivateFlags |= DRAW_ANIMATION; 12743 12744 final int left = mLeft + (int) region.left; 12745 final int top = mTop + (int) region.top; 12746 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12747 top + (int) (region.height() + .5f)); 12748 } 12749 } 12750 return more; 12751 } 12752 12753 /** 12754 * This method is called by getDisplayList() when a display list is created or re-rendered. 12755 * It sets or resets the current value of all properties on that display list (resetting is 12756 * necessary when a display list is being re-created, because we need to make sure that 12757 * previously-set transform values 12758 */ 12759 void setDisplayListProperties(DisplayList displayList) { 12760 if (displayList != null) { 12761 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12762 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12763 if (mParent instanceof ViewGroup) { 12764 displayList.setClipChildren( 12765 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12766 } 12767 float alpha = 1; 12768 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12769 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12770 ViewGroup parentVG = (ViewGroup) mParent; 12771 final boolean hasTransform = 12772 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12773 if (hasTransform) { 12774 Transformation transform = parentVG.mChildTransformation; 12775 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12776 if (transformType != Transformation.TYPE_IDENTITY) { 12777 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12778 alpha = transform.getAlpha(); 12779 } 12780 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12781 displayList.setStaticMatrix(transform.getMatrix()); 12782 } 12783 } 12784 } 12785 } 12786 if (mTransformationInfo != null) { 12787 alpha *= mTransformationInfo.mAlpha; 12788 if (alpha < 1) { 12789 final int multipliedAlpha = (int) (255 * alpha); 12790 if (onSetAlpha(multipliedAlpha)) { 12791 alpha = 1; 12792 } 12793 } 12794 displayList.setTransformationInfo(alpha, 12795 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12796 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12797 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12798 mTransformationInfo.mScaleY); 12799 if (mTransformationInfo.mCamera == null) { 12800 mTransformationInfo.mCamera = new Camera(); 12801 mTransformationInfo.matrix3D = new Matrix(); 12802 } 12803 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12804 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12805 displayList.setPivotX(getPivotX()); 12806 displayList.setPivotY(getPivotY()); 12807 } 12808 } else if (alpha < 1) { 12809 displayList.setAlpha(alpha); 12810 } 12811 } 12812 } 12813 12814 /** 12815 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12816 * This draw() method is an implementation detail and is not intended to be overridden or 12817 * to be called from anywhere else other than ViewGroup.drawChild(). 12818 */ 12819 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12820 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12821 boolean more = false; 12822 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12823 final int flags = parent.mGroupFlags; 12824 12825 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12826 parent.mChildTransformation.clear(); 12827 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12828 } 12829 12830 Transformation transformToApply = null; 12831 boolean concatMatrix = false; 12832 12833 boolean scalingRequired = false; 12834 boolean caching; 12835 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12836 12837 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12838 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12839 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12840 caching = true; 12841 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12842 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12843 } else { 12844 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12845 } 12846 12847 final Animation a = getAnimation(); 12848 if (a != null) { 12849 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12850 concatMatrix = a.willChangeTransformationMatrix(); 12851 if (concatMatrix) { 12852 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12853 } 12854 transformToApply = parent.mChildTransformation; 12855 } else { 12856 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12857 mDisplayList != null) { 12858 // No longer animating: clear out old animation matrix 12859 mDisplayList.setAnimationMatrix(null); 12860 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12861 } 12862 if (!useDisplayListProperties && 12863 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12864 final boolean hasTransform = 12865 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12866 if (hasTransform) { 12867 final int transformType = parent.mChildTransformation.getTransformationType(); 12868 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12869 parent.mChildTransformation : null; 12870 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12871 } 12872 } 12873 } 12874 12875 concatMatrix |= !childHasIdentityMatrix; 12876 12877 // Sets the flag as early as possible to allow draw() implementations 12878 // to call invalidate() successfully when doing animations 12879 mPrivateFlags |= DRAWN; 12880 12881 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12882 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12883 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12884 return more; 12885 } 12886 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12887 12888 if (hardwareAccelerated) { 12889 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12890 // retain the flag's value temporarily in the mRecreateDisplayList flag 12891 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12892 mPrivateFlags &= ~INVALIDATED; 12893 } 12894 12895 computeScroll(); 12896 12897 final int sx = mScrollX; 12898 final int sy = mScrollY; 12899 12900 DisplayList displayList = null; 12901 Bitmap cache = null; 12902 boolean hasDisplayList = false; 12903 if (caching) { 12904 if (!hardwareAccelerated) { 12905 if (layerType != LAYER_TYPE_NONE) { 12906 layerType = LAYER_TYPE_SOFTWARE; 12907 buildDrawingCache(true); 12908 } 12909 cache = getDrawingCache(true); 12910 } else { 12911 switch (layerType) { 12912 case LAYER_TYPE_SOFTWARE: 12913 if (useDisplayListProperties) { 12914 hasDisplayList = canHaveDisplayList(); 12915 } else { 12916 buildDrawingCache(true); 12917 cache = getDrawingCache(true); 12918 } 12919 break; 12920 case LAYER_TYPE_HARDWARE: 12921 if (useDisplayListProperties) { 12922 hasDisplayList = canHaveDisplayList(); 12923 } 12924 break; 12925 case LAYER_TYPE_NONE: 12926 // Delay getting the display list until animation-driven alpha values are 12927 // set up and possibly passed on to the view 12928 hasDisplayList = canHaveDisplayList(); 12929 break; 12930 } 12931 } 12932 } 12933 useDisplayListProperties &= hasDisplayList; 12934 if (useDisplayListProperties) { 12935 displayList = getDisplayList(); 12936 if (!displayList.isValid()) { 12937 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12938 // to getDisplayList(), the display list will be marked invalid and we should not 12939 // try to use it again. 12940 displayList = null; 12941 hasDisplayList = false; 12942 useDisplayListProperties = false; 12943 } 12944 } 12945 12946 final boolean hasNoCache = cache == null || hasDisplayList; 12947 final boolean offsetForScroll = cache == null && !hasDisplayList && 12948 layerType != LAYER_TYPE_HARDWARE; 12949 12950 int restoreTo = -1; 12951 if (!useDisplayListProperties || transformToApply != null) { 12952 restoreTo = canvas.save(); 12953 } 12954 if (offsetForScroll) { 12955 canvas.translate(mLeft - sx, mTop - sy); 12956 } else { 12957 if (!useDisplayListProperties) { 12958 canvas.translate(mLeft, mTop); 12959 } 12960 if (scalingRequired) { 12961 if (useDisplayListProperties) { 12962 // TODO: Might not need this if we put everything inside the DL 12963 restoreTo = canvas.save(); 12964 } 12965 // mAttachInfo cannot be null, otherwise scalingRequired == false 12966 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12967 canvas.scale(scale, scale); 12968 } 12969 } 12970 12971 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12972 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12973 if (transformToApply != null || !childHasIdentityMatrix) { 12974 int transX = 0; 12975 int transY = 0; 12976 12977 if (offsetForScroll) { 12978 transX = -sx; 12979 transY = -sy; 12980 } 12981 12982 if (transformToApply != null) { 12983 if (concatMatrix) { 12984 if (useDisplayListProperties) { 12985 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12986 } else { 12987 // Undo the scroll translation, apply the transformation matrix, 12988 // then redo the scroll translate to get the correct result. 12989 canvas.translate(-transX, -transY); 12990 canvas.concat(transformToApply.getMatrix()); 12991 canvas.translate(transX, transY); 12992 } 12993 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12994 } 12995 12996 float transformAlpha = transformToApply.getAlpha(); 12997 if (transformAlpha < 1) { 12998 alpha *= transformToApply.getAlpha(); 12999 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13000 } 13001 } 13002 13003 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13004 canvas.translate(-transX, -transY); 13005 canvas.concat(getMatrix()); 13006 canvas.translate(transX, transY); 13007 } 13008 } 13009 13010 if (alpha < 1) { 13011 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13012 if (hasNoCache) { 13013 final int multipliedAlpha = (int) (255 * alpha); 13014 if (!onSetAlpha(multipliedAlpha)) { 13015 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13016 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13017 layerType != LAYER_TYPE_NONE) { 13018 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13019 } 13020 if (useDisplayListProperties) { 13021 displayList.setAlpha(alpha * getAlpha()); 13022 } else if (layerType == LAYER_TYPE_NONE) { 13023 final int scrollX = hasDisplayList ? 0 : sx; 13024 final int scrollY = hasDisplayList ? 0 : sy; 13025 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13026 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13027 } 13028 } else { 13029 // Alpha is handled by the child directly, clobber the layer's alpha 13030 mPrivateFlags |= ALPHA_SET; 13031 } 13032 } 13033 } 13034 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13035 onSetAlpha(255); 13036 mPrivateFlags &= ~ALPHA_SET; 13037 } 13038 13039 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13040 !useDisplayListProperties) { 13041 if (offsetForScroll) { 13042 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13043 } else { 13044 if (!scalingRequired || cache == null) { 13045 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13046 } else { 13047 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13048 } 13049 } 13050 } 13051 13052 if (!useDisplayListProperties && hasDisplayList) { 13053 displayList = getDisplayList(); 13054 if (!displayList.isValid()) { 13055 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13056 // to getDisplayList(), the display list will be marked invalid and we should not 13057 // try to use it again. 13058 displayList = null; 13059 hasDisplayList = false; 13060 } 13061 } 13062 13063 if (hasNoCache) { 13064 boolean layerRendered = false; 13065 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13066 final HardwareLayer layer = getHardwareLayer(); 13067 if (layer != null && layer.isValid()) { 13068 mLayerPaint.setAlpha((int) (alpha * 255)); 13069 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13070 layerRendered = true; 13071 } else { 13072 final int scrollX = hasDisplayList ? 0 : sx; 13073 final int scrollY = hasDisplayList ? 0 : sy; 13074 canvas.saveLayer(scrollX, scrollY, 13075 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13076 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13077 } 13078 } 13079 13080 if (!layerRendered) { 13081 if (!hasDisplayList) { 13082 // Fast path for layouts with no backgrounds 13083 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13084 if (ViewDebug.TRACE_HIERARCHY) { 13085 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 13086 } 13087 mPrivateFlags &= ~DIRTY_MASK; 13088 dispatchDraw(canvas); 13089 } else { 13090 draw(canvas); 13091 } 13092 } else { 13093 mPrivateFlags &= ~DIRTY_MASK; 13094 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13095 } 13096 } 13097 } else if (cache != null) { 13098 mPrivateFlags &= ~DIRTY_MASK; 13099 Paint cachePaint; 13100 13101 if (layerType == LAYER_TYPE_NONE) { 13102 cachePaint = parent.mCachePaint; 13103 if (cachePaint == null) { 13104 cachePaint = new Paint(); 13105 cachePaint.setDither(false); 13106 parent.mCachePaint = cachePaint; 13107 } 13108 if (alpha < 1) { 13109 cachePaint.setAlpha((int) (alpha * 255)); 13110 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13111 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13112 cachePaint.setAlpha(255); 13113 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13114 } 13115 } else { 13116 cachePaint = mLayerPaint; 13117 cachePaint.setAlpha((int) (alpha * 255)); 13118 } 13119 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13120 } 13121 13122 if (restoreTo >= 0) { 13123 canvas.restoreToCount(restoreTo); 13124 } 13125 13126 if (a != null && !more) { 13127 if (!hardwareAccelerated && !a.getFillAfter()) { 13128 onSetAlpha(255); 13129 } 13130 parent.finishAnimatingView(this, a); 13131 } 13132 13133 if (more && hardwareAccelerated) { 13134 // invalidation is the trigger to recreate display lists, so if we're using 13135 // display lists to render, force an invalidate to allow the animation to 13136 // continue drawing another frame 13137 parent.invalidate(true); 13138 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13139 // alpha animations should cause the child to recreate its display list 13140 invalidate(true); 13141 } 13142 } 13143 13144 mRecreateDisplayList = false; 13145 13146 return more; 13147 } 13148 13149 /** 13150 * Manually render this view (and all of its children) to the given Canvas. 13151 * The view must have already done a full layout before this function is 13152 * called. When implementing a view, implement 13153 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13154 * If you do need to override this method, call the superclass version. 13155 * 13156 * @param canvas The Canvas to which the View is rendered. 13157 */ 13158 public void draw(Canvas canvas) { 13159 if (ViewDebug.TRACE_HIERARCHY) { 13160 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13161 } 13162 13163 final int privateFlags = mPrivateFlags; 13164 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13165 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13166 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13167 13168 /* 13169 * Draw traversal performs several drawing steps which must be executed 13170 * in the appropriate order: 13171 * 13172 * 1. Draw the background 13173 * 2. If necessary, save the canvas' layers to prepare for fading 13174 * 3. Draw view's content 13175 * 4. Draw children 13176 * 5. If necessary, draw the fading edges and restore layers 13177 * 6. Draw decorations (scrollbars for instance) 13178 */ 13179 13180 // Step 1, draw the background, if needed 13181 int saveCount; 13182 13183 if (!dirtyOpaque) { 13184 final Drawable background = mBackground; 13185 if (background != null) { 13186 final int scrollX = mScrollX; 13187 final int scrollY = mScrollY; 13188 13189 if (mBackgroundSizeChanged) { 13190 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13191 mBackgroundSizeChanged = false; 13192 } 13193 13194 if ((scrollX | scrollY) == 0) { 13195 background.draw(canvas); 13196 } else { 13197 canvas.translate(scrollX, scrollY); 13198 background.draw(canvas); 13199 canvas.translate(-scrollX, -scrollY); 13200 } 13201 } 13202 } 13203 13204 // skip step 2 & 5 if possible (common case) 13205 final int viewFlags = mViewFlags; 13206 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13207 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13208 if (!verticalEdges && !horizontalEdges) { 13209 // Step 3, draw the content 13210 if (!dirtyOpaque) onDraw(canvas); 13211 13212 // Step 4, draw the children 13213 dispatchDraw(canvas); 13214 13215 // Step 6, draw decorations (scrollbars) 13216 onDrawScrollBars(canvas); 13217 13218 // we're done... 13219 return; 13220 } 13221 13222 /* 13223 * Here we do the full fledged routine... 13224 * (this is an uncommon case where speed matters less, 13225 * this is why we repeat some of the tests that have been 13226 * done above) 13227 */ 13228 13229 boolean drawTop = false; 13230 boolean drawBottom = false; 13231 boolean drawLeft = false; 13232 boolean drawRight = false; 13233 13234 float topFadeStrength = 0.0f; 13235 float bottomFadeStrength = 0.0f; 13236 float leftFadeStrength = 0.0f; 13237 float rightFadeStrength = 0.0f; 13238 13239 // Step 2, save the canvas' layers 13240 int paddingLeft = mPaddingLeft; 13241 13242 final boolean offsetRequired = isPaddingOffsetRequired(); 13243 if (offsetRequired) { 13244 paddingLeft += getLeftPaddingOffset(); 13245 } 13246 13247 int left = mScrollX + paddingLeft; 13248 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13249 int top = mScrollY + getFadeTop(offsetRequired); 13250 int bottom = top + getFadeHeight(offsetRequired); 13251 13252 if (offsetRequired) { 13253 right += getRightPaddingOffset(); 13254 bottom += getBottomPaddingOffset(); 13255 } 13256 13257 final ScrollabilityCache scrollabilityCache = mScrollCache; 13258 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13259 int length = (int) fadeHeight; 13260 13261 // clip the fade length if top and bottom fades overlap 13262 // overlapping fades produce odd-looking artifacts 13263 if (verticalEdges && (top + length > bottom - length)) { 13264 length = (bottom - top) / 2; 13265 } 13266 13267 // also clip horizontal fades if necessary 13268 if (horizontalEdges && (left + length > right - length)) { 13269 length = (right - left) / 2; 13270 } 13271 13272 if (verticalEdges) { 13273 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13274 drawTop = topFadeStrength * fadeHeight > 1.0f; 13275 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13276 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13277 } 13278 13279 if (horizontalEdges) { 13280 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13281 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13282 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13283 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13284 } 13285 13286 saveCount = canvas.getSaveCount(); 13287 13288 int solidColor = getSolidColor(); 13289 if (solidColor == 0) { 13290 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13291 13292 if (drawTop) { 13293 canvas.saveLayer(left, top, right, top + length, null, flags); 13294 } 13295 13296 if (drawBottom) { 13297 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13298 } 13299 13300 if (drawLeft) { 13301 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13302 } 13303 13304 if (drawRight) { 13305 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13306 } 13307 } else { 13308 scrollabilityCache.setFadeColor(solidColor); 13309 } 13310 13311 // Step 3, draw the content 13312 if (!dirtyOpaque) onDraw(canvas); 13313 13314 // Step 4, draw the children 13315 dispatchDraw(canvas); 13316 13317 // Step 5, draw the fade effect and restore layers 13318 final Paint p = scrollabilityCache.paint; 13319 final Matrix matrix = scrollabilityCache.matrix; 13320 final Shader fade = scrollabilityCache.shader; 13321 13322 if (drawTop) { 13323 matrix.setScale(1, fadeHeight * topFadeStrength); 13324 matrix.postTranslate(left, top); 13325 fade.setLocalMatrix(matrix); 13326 canvas.drawRect(left, top, right, top + length, p); 13327 } 13328 13329 if (drawBottom) { 13330 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13331 matrix.postRotate(180); 13332 matrix.postTranslate(left, bottom); 13333 fade.setLocalMatrix(matrix); 13334 canvas.drawRect(left, bottom - length, right, bottom, p); 13335 } 13336 13337 if (drawLeft) { 13338 matrix.setScale(1, fadeHeight * leftFadeStrength); 13339 matrix.postRotate(-90); 13340 matrix.postTranslate(left, top); 13341 fade.setLocalMatrix(matrix); 13342 canvas.drawRect(left, top, left + length, bottom, p); 13343 } 13344 13345 if (drawRight) { 13346 matrix.setScale(1, fadeHeight * rightFadeStrength); 13347 matrix.postRotate(90); 13348 matrix.postTranslate(right, top); 13349 fade.setLocalMatrix(matrix); 13350 canvas.drawRect(right - length, top, right, bottom, p); 13351 } 13352 13353 canvas.restoreToCount(saveCount); 13354 13355 // Step 6, draw decorations (scrollbars) 13356 onDrawScrollBars(canvas); 13357 } 13358 13359 /** 13360 * Override this if your view is known to always be drawn on top of a solid color background, 13361 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13362 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13363 * should be set to 0xFF. 13364 * 13365 * @see #setVerticalFadingEdgeEnabled(boolean) 13366 * @see #setHorizontalFadingEdgeEnabled(boolean) 13367 * 13368 * @return The known solid color background for this view, or 0 if the color may vary 13369 */ 13370 @ViewDebug.ExportedProperty(category = "drawing") 13371 public int getSolidColor() { 13372 return 0; 13373 } 13374 13375 /** 13376 * Build a human readable string representation of the specified view flags. 13377 * 13378 * @param flags the view flags to convert to a string 13379 * @return a String representing the supplied flags 13380 */ 13381 private static String printFlags(int flags) { 13382 String output = ""; 13383 int numFlags = 0; 13384 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13385 output += "TAKES_FOCUS"; 13386 numFlags++; 13387 } 13388 13389 switch (flags & VISIBILITY_MASK) { 13390 case INVISIBLE: 13391 if (numFlags > 0) { 13392 output += " "; 13393 } 13394 output += "INVISIBLE"; 13395 // USELESS HERE numFlags++; 13396 break; 13397 case GONE: 13398 if (numFlags > 0) { 13399 output += " "; 13400 } 13401 output += "GONE"; 13402 // USELESS HERE numFlags++; 13403 break; 13404 default: 13405 break; 13406 } 13407 return output; 13408 } 13409 13410 /** 13411 * Build a human readable string representation of the specified private 13412 * view flags. 13413 * 13414 * @param privateFlags the private view flags to convert to a string 13415 * @return a String representing the supplied flags 13416 */ 13417 private static String printPrivateFlags(int privateFlags) { 13418 String output = ""; 13419 int numFlags = 0; 13420 13421 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13422 output += "WANTS_FOCUS"; 13423 numFlags++; 13424 } 13425 13426 if ((privateFlags & FOCUSED) == FOCUSED) { 13427 if (numFlags > 0) { 13428 output += " "; 13429 } 13430 output += "FOCUSED"; 13431 numFlags++; 13432 } 13433 13434 if ((privateFlags & SELECTED) == SELECTED) { 13435 if (numFlags > 0) { 13436 output += " "; 13437 } 13438 output += "SELECTED"; 13439 numFlags++; 13440 } 13441 13442 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13443 if (numFlags > 0) { 13444 output += " "; 13445 } 13446 output += "IS_ROOT_NAMESPACE"; 13447 numFlags++; 13448 } 13449 13450 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13451 if (numFlags > 0) { 13452 output += " "; 13453 } 13454 output += "HAS_BOUNDS"; 13455 numFlags++; 13456 } 13457 13458 if ((privateFlags & DRAWN) == DRAWN) { 13459 if (numFlags > 0) { 13460 output += " "; 13461 } 13462 output += "DRAWN"; 13463 // USELESS HERE numFlags++; 13464 } 13465 return output; 13466 } 13467 13468 /** 13469 * <p>Indicates whether or not this view's layout will be requested during 13470 * the next hierarchy layout pass.</p> 13471 * 13472 * @return true if the layout will be forced during next layout pass 13473 */ 13474 public boolean isLayoutRequested() { 13475 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13476 } 13477 13478 /** 13479 * Assign a size and position to a view and all of its 13480 * descendants 13481 * 13482 * <p>This is the second phase of the layout mechanism. 13483 * (The first is measuring). In this phase, each parent calls 13484 * layout on all of its children to position them. 13485 * This is typically done using the child measurements 13486 * that were stored in the measure pass().</p> 13487 * 13488 * <p>Derived classes should not override this method. 13489 * Derived classes with children should override 13490 * onLayout. In that method, they should 13491 * call layout on each of their children.</p> 13492 * 13493 * @param l Left position, relative to parent 13494 * @param t Top position, relative to parent 13495 * @param r Right position, relative to parent 13496 * @param b Bottom position, relative to parent 13497 */ 13498 @SuppressWarnings({"unchecked"}) 13499 public void layout(int l, int t, int r, int b) { 13500 int oldL = mLeft; 13501 int oldT = mTop; 13502 int oldB = mBottom; 13503 int oldR = mRight; 13504 boolean changed = setFrame(l, t, r, b); 13505 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13506 if (ViewDebug.TRACE_HIERARCHY) { 13507 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13508 } 13509 13510 onLayout(changed, l, t, r, b); 13511 mPrivateFlags &= ~LAYOUT_REQUIRED; 13512 13513 ListenerInfo li = mListenerInfo; 13514 if (li != null && li.mOnLayoutChangeListeners != null) { 13515 ArrayList<OnLayoutChangeListener> listenersCopy = 13516 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13517 int numListeners = listenersCopy.size(); 13518 for (int i = 0; i < numListeners; ++i) { 13519 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13520 } 13521 } 13522 } 13523 mPrivateFlags &= ~FORCE_LAYOUT; 13524 } 13525 13526 /** 13527 * Called from layout when this view should 13528 * assign a size and position to each of its children. 13529 * 13530 * Derived classes with children should override 13531 * this method and call layout on each of 13532 * their children. 13533 * @param changed This is a new size or position for this view 13534 * @param left Left position, relative to parent 13535 * @param top Top position, relative to parent 13536 * @param right Right position, relative to parent 13537 * @param bottom Bottom position, relative to parent 13538 */ 13539 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13540 } 13541 13542 /** 13543 * Assign a size and position to this view. 13544 * 13545 * This is called from layout. 13546 * 13547 * @param left Left position, relative to parent 13548 * @param top Top position, relative to parent 13549 * @param right Right position, relative to parent 13550 * @param bottom Bottom position, relative to parent 13551 * @return true if the new size and position are different than the 13552 * previous ones 13553 * {@hide} 13554 */ 13555 protected boolean setFrame(int left, int top, int right, int bottom) { 13556 boolean changed = false; 13557 13558 if (DBG) { 13559 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13560 + right + "," + bottom + ")"); 13561 } 13562 13563 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13564 changed = true; 13565 13566 // Remember our drawn bit 13567 int drawn = mPrivateFlags & DRAWN; 13568 13569 int oldWidth = mRight - mLeft; 13570 int oldHeight = mBottom - mTop; 13571 int newWidth = right - left; 13572 int newHeight = bottom - top; 13573 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13574 13575 // Invalidate our old position 13576 invalidate(sizeChanged); 13577 13578 mLeft = left; 13579 mTop = top; 13580 mRight = right; 13581 mBottom = bottom; 13582 if (mDisplayList != null) { 13583 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13584 } 13585 13586 mPrivateFlags |= HAS_BOUNDS; 13587 13588 13589 if (sizeChanged) { 13590 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13591 // A change in dimension means an auto-centered pivot point changes, too 13592 if (mTransformationInfo != null) { 13593 mTransformationInfo.mMatrixDirty = true; 13594 } 13595 } 13596 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13597 } 13598 13599 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13600 // If we are visible, force the DRAWN bit to on so that 13601 // this invalidate will go through (at least to our parent). 13602 // This is because someone may have invalidated this view 13603 // before this call to setFrame came in, thereby clearing 13604 // the DRAWN bit. 13605 mPrivateFlags |= DRAWN; 13606 invalidate(sizeChanged); 13607 // parent display list may need to be recreated based on a change in the bounds 13608 // of any child 13609 invalidateParentCaches(); 13610 } 13611 13612 // Reset drawn bit to original value (invalidate turns it off) 13613 mPrivateFlags |= drawn; 13614 13615 mBackgroundSizeChanged = true; 13616 } 13617 return changed; 13618 } 13619 13620 /** 13621 * Finalize inflating a view from XML. This is called as the last phase 13622 * of inflation, after all child views have been added. 13623 * 13624 * <p>Even if the subclass overrides onFinishInflate, they should always be 13625 * sure to call the super method, so that we get called. 13626 */ 13627 protected void onFinishInflate() { 13628 } 13629 13630 /** 13631 * Returns the resources associated with this view. 13632 * 13633 * @return Resources object. 13634 */ 13635 public Resources getResources() { 13636 return mResources; 13637 } 13638 13639 /** 13640 * Invalidates the specified Drawable. 13641 * 13642 * @param drawable the drawable to invalidate 13643 */ 13644 public void invalidateDrawable(Drawable drawable) { 13645 if (verifyDrawable(drawable)) { 13646 final Rect dirty = drawable.getBounds(); 13647 final int scrollX = mScrollX; 13648 final int scrollY = mScrollY; 13649 13650 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13651 dirty.right + scrollX, dirty.bottom + scrollY); 13652 } 13653 } 13654 13655 /** 13656 * Schedules an action on a drawable to occur at a specified time. 13657 * 13658 * @param who the recipient of the action 13659 * @param what the action to run on the drawable 13660 * @param when the time at which the action must occur. Uses the 13661 * {@link SystemClock#uptimeMillis} timebase. 13662 */ 13663 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13664 if (verifyDrawable(who) && what != null) { 13665 final long delay = when - SystemClock.uptimeMillis(); 13666 if (mAttachInfo != null) { 13667 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13668 Choreographer.CALLBACK_ANIMATION, what, who, 13669 Choreographer.subtractFrameDelay(delay)); 13670 } else { 13671 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13672 } 13673 } 13674 } 13675 13676 /** 13677 * Cancels a scheduled action on a drawable. 13678 * 13679 * @param who the recipient of the action 13680 * @param what the action to cancel 13681 */ 13682 public void unscheduleDrawable(Drawable who, Runnable what) { 13683 if (verifyDrawable(who) && what != null) { 13684 if (mAttachInfo != null) { 13685 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13686 Choreographer.CALLBACK_ANIMATION, what, who); 13687 } else { 13688 ViewRootImpl.getRunQueue().removeCallbacks(what); 13689 } 13690 } 13691 } 13692 13693 /** 13694 * Unschedule any events associated with the given Drawable. This can be 13695 * used when selecting a new Drawable into a view, so that the previous 13696 * one is completely unscheduled. 13697 * 13698 * @param who The Drawable to unschedule. 13699 * 13700 * @see #drawableStateChanged 13701 */ 13702 public void unscheduleDrawable(Drawable who) { 13703 if (mAttachInfo != null && who != null) { 13704 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13705 Choreographer.CALLBACK_ANIMATION, null, who); 13706 } 13707 } 13708 13709 /** 13710 * Return the layout direction of a given Drawable. 13711 * 13712 * @param who the Drawable to query 13713 */ 13714 public int getResolvedLayoutDirection(Drawable who) { 13715 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13716 } 13717 13718 /** 13719 * If your view subclass is displaying its own Drawable objects, it should 13720 * override this function and return true for any Drawable it is 13721 * displaying. This allows animations for those drawables to be 13722 * scheduled. 13723 * 13724 * <p>Be sure to call through to the super class when overriding this 13725 * function. 13726 * 13727 * @param who The Drawable to verify. Return true if it is one you are 13728 * displaying, else return the result of calling through to the 13729 * super class. 13730 * 13731 * @return boolean If true than the Drawable is being displayed in the 13732 * view; else false and it is not allowed to animate. 13733 * 13734 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13735 * @see #drawableStateChanged() 13736 */ 13737 protected boolean verifyDrawable(Drawable who) { 13738 return who == mBackground; 13739 } 13740 13741 /** 13742 * This function is called whenever the state of the view changes in such 13743 * a way that it impacts the state of drawables being shown. 13744 * 13745 * <p>Be sure to call through to the superclass when overriding this 13746 * function. 13747 * 13748 * @see Drawable#setState(int[]) 13749 */ 13750 protected void drawableStateChanged() { 13751 Drawable d = mBackground; 13752 if (d != null && d.isStateful()) { 13753 d.setState(getDrawableState()); 13754 } 13755 } 13756 13757 /** 13758 * Call this to force a view to update its drawable state. This will cause 13759 * drawableStateChanged to be called on this view. Views that are interested 13760 * in the new state should call getDrawableState. 13761 * 13762 * @see #drawableStateChanged 13763 * @see #getDrawableState 13764 */ 13765 public void refreshDrawableState() { 13766 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13767 drawableStateChanged(); 13768 13769 ViewParent parent = mParent; 13770 if (parent != null) { 13771 parent.childDrawableStateChanged(this); 13772 } 13773 } 13774 13775 /** 13776 * Return an array of resource IDs of the drawable states representing the 13777 * current state of the view. 13778 * 13779 * @return The current drawable state 13780 * 13781 * @see Drawable#setState(int[]) 13782 * @see #drawableStateChanged() 13783 * @see #onCreateDrawableState(int) 13784 */ 13785 public final int[] getDrawableState() { 13786 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13787 return mDrawableState; 13788 } else { 13789 mDrawableState = onCreateDrawableState(0); 13790 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13791 return mDrawableState; 13792 } 13793 } 13794 13795 /** 13796 * Generate the new {@link android.graphics.drawable.Drawable} state for 13797 * this view. This is called by the view 13798 * system when the cached Drawable state is determined to be invalid. To 13799 * retrieve the current state, you should use {@link #getDrawableState}. 13800 * 13801 * @param extraSpace if non-zero, this is the number of extra entries you 13802 * would like in the returned array in which you can place your own 13803 * states. 13804 * 13805 * @return Returns an array holding the current {@link Drawable} state of 13806 * the view. 13807 * 13808 * @see #mergeDrawableStates(int[], int[]) 13809 */ 13810 protected int[] onCreateDrawableState(int extraSpace) { 13811 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13812 mParent instanceof View) { 13813 return ((View) mParent).onCreateDrawableState(extraSpace); 13814 } 13815 13816 int[] drawableState; 13817 13818 int privateFlags = mPrivateFlags; 13819 13820 int viewStateIndex = 0; 13821 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13822 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13823 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13824 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13825 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13826 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13827 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13828 HardwareRenderer.isAvailable()) { 13829 // This is set if HW acceleration is requested, even if the current 13830 // process doesn't allow it. This is just to allow app preview 13831 // windows to better match their app. 13832 viewStateIndex |= VIEW_STATE_ACCELERATED; 13833 } 13834 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13835 13836 final int privateFlags2 = mPrivateFlags2; 13837 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13838 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13839 13840 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13841 13842 //noinspection ConstantIfStatement 13843 if (false) { 13844 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13845 Log.i("View", toString() 13846 + " pressed=" + ((privateFlags & PRESSED) != 0) 13847 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13848 + " fo=" + hasFocus() 13849 + " sl=" + ((privateFlags & SELECTED) != 0) 13850 + " wf=" + hasWindowFocus() 13851 + ": " + Arrays.toString(drawableState)); 13852 } 13853 13854 if (extraSpace == 0) { 13855 return drawableState; 13856 } 13857 13858 final int[] fullState; 13859 if (drawableState != null) { 13860 fullState = new int[drawableState.length + extraSpace]; 13861 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13862 } else { 13863 fullState = new int[extraSpace]; 13864 } 13865 13866 return fullState; 13867 } 13868 13869 /** 13870 * Merge your own state values in <var>additionalState</var> into the base 13871 * state values <var>baseState</var> that were returned by 13872 * {@link #onCreateDrawableState(int)}. 13873 * 13874 * @param baseState The base state values returned by 13875 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13876 * own additional state values. 13877 * 13878 * @param additionalState The additional state values you would like 13879 * added to <var>baseState</var>; this array is not modified. 13880 * 13881 * @return As a convenience, the <var>baseState</var> array you originally 13882 * passed into the function is returned. 13883 * 13884 * @see #onCreateDrawableState(int) 13885 */ 13886 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13887 final int N = baseState.length; 13888 int i = N - 1; 13889 while (i >= 0 && baseState[i] == 0) { 13890 i--; 13891 } 13892 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13893 return baseState; 13894 } 13895 13896 /** 13897 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13898 * on all Drawable objects associated with this view. 13899 */ 13900 public void jumpDrawablesToCurrentState() { 13901 if (mBackground != null) { 13902 mBackground.jumpToCurrentState(); 13903 } 13904 } 13905 13906 /** 13907 * Sets the background color for this view. 13908 * @param color the color of the background 13909 */ 13910 @RemotableViewMethod 13911 public void setBackgroundColor(int color) { 13912 if (mBackground instanceof ColorDrawable) { 13913 ((ColorDrawable) mBackground).setColor(color); 13914 } else { 13915 setBackground(new ColorDrawable(color)); 13916 } 13917 } 13918 13919 /** 13920 * Set the background to a given resource. The resource should refer to 13921 * a Drawable object or 0 to remove the background. 13922 * @param resid The identifier of the resource. 13923 * 13924 * @attr ref android.R.styleable#View_background 13925 */ 13926 @RemotableViewMethod 13927 public void setBackgroundResource(int resid) { 13928 if (resid != 0 && resid == mBackgroundResource) { 13929 return; 13930 } 13931 13932 Drawable d= null; 13933 if (resid != 0) { 13934 d = mResources.getDrawable(resid); 13935 } 13936 setBackground(d); 13937 13938 mBackgroundResource = resid; 13939 } 13940 13941 /** 13942 * Set the background to a given Drawable, or remove the background. If the 13943 * background has padding, this View's padding is set to the background's 13944 * padding. However, when a background is removed, this View's padding isn't 13945 * touched. If setting the padding is desired, please use 13946 * {@link #setPadding(int, int, int, int)}. 13947 * 13948 * @param background The Drawable to use as the background, or null to remove the 13949 * background 13950 */ 13951 public void setBackground(Drawable background) { 13952 //noinspection deprecation 13953 setBackgroundDrawable(background); 13954 } 13955 13956 /** 13957 * @deprecated use {@link #setBackground(Drawable)} instead 13958 */ 13959 @Deprecated 13960 public void setBackgroundDrawable(Drawable background) { 13961 if (background == mBackground) { 13962 return; 13963 } 13964 13965 boolean requestLayout = false; 13966 13967 mBackgroundResource = 0; 13968 13969 /* 13970 * Regardless of whether we're setting a new background or not, we want 13971 * to clear the previous drawable. 13972 */ 13973 if (mBackground != null) { 13974 mBackground.setCallback(null); 13975 unscheduleDrawable(mBackground); 13976 } 13977 13978 if (background != null) { 13979 Rect padding = sThreadLocal.get(); 13980 if (padding == null) { 13981 padding = new Rect(); 13982 sThreadLocal.set(padding); 13983 } 13984 if (background.getPadding(padding)) { 13985 switch (background.getResolvedLayoutDirectionSelf()) { 13986 case LAYOUT_DIRECTION_RTL: 13987 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13988 break; 13989 case LAYOUT_DIRECTION_LTR: 13990 default: 13991 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13992 } 13993 } 13994 13995 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13996 // if it has a different minimum size, we should layout again 13997 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13998 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13999 requestLayout = true; 14000 } 14001 14002 background.setCallback(this); 14003 if (background.isStateful()) { 14004 background.setState(getDrawableState()); 14005 } 14006 background.setVisible(getVisibility() == VISIBLE, false); 14007 mBackground = background; 14008 14009 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14010 mPrivateFlags &= ~SKIP_DRAW; 14011 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14012 requestLayout = true; 14013 } 14014 } else { 14015 /* Remove the background */ 14016 mBackground = null; 14017 14018 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14019 /* 14020 * This view ONLY drew the background before and we're removing 14021 * the background, so now it won't draw anything 14022 * (hence we SKIP_DRAW) 14023 */ 14024 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14025 mPrivateFlags |= SKIP_DRAW; 14026 } 14027 14028 /* 14029 * When the background is set, we try to apply its padding to this 14030 * View. When the background is removed, we don't touch this View's 14031 * padding. This is noted in the Javadocs. Hence, we don't need to 14032 * requestLayout(), the invalidate() below is sufficient. 14033 */ 14034 14035 // The old background's minimum size could have affected this 14036 // View's layout, so let's requestLayout 14037 requestLayout = true; 14038 } 14039 14040 computeOpaqueFlags(); 14041 14042 if (requestLayout) { 14043 requestLayout(); 14044 } 14045 14046 mBackgroundSizeChanged = true; 14047 invalidate(true); 14048 } 14049 14050 /** 14051 * Gets the background drawable 14052 * 14053 * @return The drawable used as the background for this view, if any. 14054 * 14055 * @see #setBackground(Drawable) 14056 * 14057 * @attr ref android.R.styleable#View_background 14058 */ 14059 public Drawable getBackground() { 14060 return mBackground; 14061 } 14062 14063 /** 14064 * Sets the padding. The view may add on the space required to display 14065 * the scrollbars, depending on the style and visibility of the scrollbars. 14066 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14067 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14068 * from the values set in this call. 14069 * 14070 * @attr ref android.R.styleable#View_padding 14071 * @attr ref android.R.styleable#View_paddingBottom 14072 * @attr ref android.R.styleable#View_paddingLeft 14073 * @attr ref android.R.styleable#View_paddingRight 14074 * @attr ref android.R.styleable#View_paddingTop 14075 * @param left the left padding in pixels 14076 * @param top the top padding in pixels 14077 * @param right the right padding in pixels 14078 * @param bottom the bottom padding in pixels 14079 */ 14080 public void setPadding(int left, int top, int right, int bottom) { 14081 mUserPaddingStart = -1; 14082 mUserPaddingEnd = -1; 14083 mUserPaddingRelative = false; 14084 14085 internalSetPadding(left, top, right, bottom); 14086 } 14087 14088 private void internalSetPadding(int left, int top, int right, int bottom) { 14089 mUserPaddingLeft = left; 14090 mUserPaddingRight = right; 14091 mUserPaddingBottom = bottom; 14092 14093 final int viewFlags = mViewFlags; 14094 boolean changed = false; 14095 14096 // Common case is there are no scroll bars. 14097 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14098 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14099 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14100 ? 0 : getVerticalScrollbarWidth(); 14101 switch (mVerticalScrollbarPosition) { 14102 case SCROLLBAR_POSITION_DEFAULT: 14103 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14104 left += offset; 14105 } else { 14106 right += offset; 14107 } 14108 break; 14109 case SCROLLBAR_POSITION_RIGHT: 14110 right += offset; 14111 break; 14112 case SCROLLBAR_POSITION_LEFT: 14113 left += offset; 14114 break; 14115 } 14116 } 14117 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14118 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14119 ? 0 : getHorizontalScrollbarHeight(); 14120 } 14121 } 14122 14123 if (mPaddingLeft != left) { 14124 changed = true; 14125 mPaddingLeft = left; 14126 } 14127 if (mPaddingTop != top) { 14128 changed = true; 14129 mPaddingTop = top; 14130 } 14131 if (mPaddingRight != right) { 14132 changed = true; 14133 mPaddingRight = right; 14134 } 14135 if (mPaddingBottom != bottom) { 14136 changed = true; 14137 mPaddingBottom = bottom; 14138 } 14139 14140 if (changed) { 14141 requestLayout(); 14142 } 14143 } 14144 14145 /** 14146 * Sets the relative padding. The view may add on the space required to display 14147 * the scrollbars, depending on the style and visibility of the scrollbars. 14148 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14149 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14150 * from the values set in this call. 14151 * 14152 * @attr ref android.R.styleable#View_padding 14153 * @attr ref android.R.styleable#View_paddingBottom 14154 * @attr ref android.R.styleable#View_paddingStart 14155 * @attr ref android.R.styleable#View_paddingEnd 14156 * @attr ref android.R.styleable#View_paddingTop 14157 * @param start the start padding in pixels 14158 * @param top the top padding in pixels 14159 * @param end the end padding in pixels 14160 * @param bottom the bottom padding in pixels 14161 */ 14162 public void setPaddingRelative(int start, int top, int end, int bottom) { 14163 mUserPaddingStart = start; 14164 mUserPaddingEnd = end; 14165 mUserPaddingRelative = true; 14166 14167 switch(getResolvedLayoutDirection()) { 14168 case LAYOUT_DIRECTION_RTL: 14169 internalSetPadding(end, top, start, bottom); 14170 break; 14171 case LAYOUT_DIRECTION_LTR: 14172 default: 14173 internalSetPadding(start, top, end, bottom); 14174 } 14175 } 14176 14177 /** 14178 * Returns the top padding of this view. 14179 * 14180 * @return the top padding in pixels 14181 */ 14182 public int getPaddingTop() { 14183 return mPaddingTop; 14184 } 14185 14186 /** 14187 * Returns the bottom padding of this view. If there are inset and enabled 14188 * scrollbars, this value may include the space required to display the 14189 * scrollbars as well. 14190 * 14191 * @return the bottom padding in pixels 14192 */ 14193 public int getPaddingBottom() { 14194 return mPaddingBottom; 14195 } 14196 14197 /** 14198 * Returns the left padding of this view. If there are inset and enabled 14199 * scrollbars, this value may include the space required to display the 14200 * scrollbars as well. 14201 * 14202 * @return the left padding in pixels 14203 */ 14204 public int getPaddingLeft() { 14205 return mPaddingLeft; 14206 } 14207 14208 /** 14209 * Returns the start padding of this view depending on its resolved layout direction. 14210 * If there are inset and enabled scrollbars, this value may include the space 14211 * required to display the scrollbars as well. 14212 * 14213 * @return the start padding in pixels 14214 */ 14215 public int getPaddingStart() { 14216 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14217 mPaddingRight : mPaddingLeft; 14218 } 14219 14220 /** 14221 * Returns the right padding of this view. If there are inset and enabled 14222 * scrollbars, this value may include the space required to display the 14223 * scrollbars as well. 14224 * 14225 * @return the right padding in pixels 14226 */ 14227 public int getPaddingRight() { 14228 return mPaddingRight; 14229 } 14230 14231 /** 14232 * Returns the end padding of this view depending on its resolved layout direction. 14233 * If there are inset and enabled scrollbars, this value may include the space 14234 * required to display the scrollbars as well. 14235 * 14236 * @return the end padding in pixels 14237 */ 14238 public int getPaddingEnd() { 14239 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14240 mPaddingLeft : mPaddingRight; 14241 } 14242 14243 /** 14244 * Return if the padding as been set thru relative values 14245 * {@link #setPaddingRelative(int, int, int, int)} or thru 14246 * @attr ref android.R.styleable#View_paddingStart or 14247 * @attr ref android.R.styleable#View_paddingEnd 14248 * 14249 * @return true if the padding is relative or false if it is not. 14250 */ 14251 public boolean isPaddingRelative() { 14252 return mUserPaddingRelative; 14253 } 14254 14255 /** 14256 * @hide 14257 */ 14258 public Insets getOpticalInsets() { 14259 if (mLayoutInsets == null) { 14260 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14261 } 14262 return mLayoutInsets; 14263 } 14264 14265 /** 14266 * @hide 14267 */ 14268 public void setLayoutInsets(Insets layoutInsets) { 14269 mLayoutInsets = layoutInsets; 14270 } 14271 14272 /** 14273 * Changes the selection state of this view. A view can be selected or not. 14274 * Note that selection is not the same as focus. Views are typically 14275 * selected in the context of an AdapterView like ListView or GridView; 14276 * the selected view is the view that is highlighted. 14277 * 14278 * @param selected true if the view must be selected, false otherwise 14279 */ 14280 public void setSelected(boolean selected) { 14281 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14282 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14283 if (!selected) resetPressedState(); 14284 invalidate(true); 14285 refreshDrawableState(); 14286 dispatchSetSelected(selected); 14287 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14288 notifyAccessibilityStateChanged(); 14289 } 14290 } 14291 } 14292 14293 /** 14294 * Dispatch setSelected to all of this View's children. 14295 * 14296 * @see #setSelected(boolean) 14297 * 14298 * @param selected The new selected state 14299 */ 14300 protected void dispatchSetSelected(boolean selected) { 14301 } 14302 14303 /** 14304 * Indicates the selection state of this view. 14305 * 14306 * @return true if the view is selected, false otherwise 14307 */ 14308 @ViewDebug.ExportedProperty 14309 public boolean isSelected() { 14310 return (mPrivateFlags & SELECTED) != 0; 14311 } 14312 14313 /** 14314 * Changes the activated state of this view. A view can be activated or not. 14315 * Note that activation is not the same as selection. Selection is 14316 * a transient property, representing the view (hierarchy) the user is 14317 * currently interacting with. Activation is a longer-term state that the 14318 * user can move views in and out of. For example, in a list view with 14319 * single or multiple selection enabled, the views in the current selection 14320 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14321 * here.) The activated state is propagated down to children of the view it 14322 * is set on. 14323 * 14324 * @param activated true if the view must be activated, false otherwise 14325 */ 14326 public void setActivated(boolean activated) { 14327 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14328 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14329 invalidate(true); 14330 refreshDrawableState(); 14331 dispatchSetActivated(activated); 14332 } 14333 } 14334 14335 /** 14336 * Dispatch setActivated to all of this View's children. 14337 * 14338 * @see #setActivated(boolean) 14339 * 14340 * @param activated The new activated state 14341 */ 14342 protected void dispatchSetActivated(boolean activated) { 14343 } 14344 14345 /** 14346 * Indicates the activation state of this view. 14347 * 14348 * @return true if the view is activated, false otherwise 14349 */ 14350 @ViewDebug.ExportedProperty 14351 public boolean isActivated() { 14352 return (mPrivateFlags & ACTIVATED) != 0; 14353 } 14354 14355 /** 14356 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14357 * observer can be used to get notifications when global events, like 14358 * layout, happen. 14359 * 14360 * The returned ViewTreeObserver observer is not guaranteed to remain 14361 * valid for the lifetime of this View. If the caller of this method keeps 14362 * a long-lived reference to ViewTreeObserver, it should always check for 14363 * the return value of {@link ViewTreeObserver#isAlive()}. 14364 * 14365 * @return The ViewTreeObserver for this view's hierarchy. 14366 */ 14367 public ViewTreeObserver getViewTreeObserver() { 14368 if (mAttachInfo != null) { 14369 return mAttachInfo.mTreeObserver; 14370 } 14371 if (mFloatingTreeObserver == null) { 14372 mFloatingTreeObserver = new ViewTreeObserver(); 14373 } 14374 return mFloatingTreeObserver; 14375 } 14376 14377 /** 14378 * <p>Finds the topmost view in the current view hierarchy.</p> 14379 * 14380 * @return the topmost view containing this view 14381 */ 14382 public View getRootView() { 14383 if (mAttachInfo != null) { 14384 final View v = mAttachInfo.mRootView; 14385 if (v != null) { 14386 return v; 14387 } 14388 } 14389 14390 View parent = this; 14391 14392 while (parent.mParent != null && parent.mParent instanceof View) { 14393 parent = (View) parent.mParent; 14394 } 14395 14396 return parent; 14397 } 14398 14399 /** 14400 * <p>Computes the coordinates of this view on the screen. The argument 14401 * must be an array of two integers. After the method returns, the array 14402 * contains the x and y location in that order.</p> 14403 * 14404 * @param location an array of two integers in which to hold the coordinates 14405 */ 14406 public void getLocationOnScreen(int[] location) { 14407 getLocationInWindow(location); 14408 14409 final AttachInfo info = mAttachInfo; 14410 if (info != null) { 14411 location[0] += info.mWindowLeft; 14412 location[1] += info.mWindowTop; 14413 } 14414 } 14415 14416 /** 14417 * <p>Computes the coordinates of this view in its window. The argument 14418 * must be an array of two integers. After the method returns, the array 14419 * contains the x and y location in that order.</p> 14420 * 14421 * @param location an array of two integers in which to hold the coordinates 14422 */ 14423 public void getLocationInWindow(int[] location) { 14424 if (location == null || location.length < 2) { 14425 throw new IllegalArgumentException("location must be an array of two integers"); 14426 } 14427 14428 if (mAttachInfo == null) { 14429 // When the view is not attached to a window, this method does not make sense 14430 location[0] = location[1] = 0; 14431 return; 14432 } 14433 14434 float[] position = mAttachInfo.mTmpTransformLocation; 14435 position[0] = position[1] = 0.0f; 14436 14437 if (!hasIdentityMatrix()) { 14438 getMatrix().mapPoints(position); 14439 } 14440 14441 position[0] += mLeft; 14442 position[1] += mTop; 14443 14444 ViewParent viewParent = mParent; 14445 while (viewParent instanceof View) { 14446 final View view = (View) viewParent; 14447 14448 position[0] -= view.mScrollX; 14449 position[1] -= view.mScrollY; 14450 14451 if (!view.hasIdentityMatrix()) { 14452 view.getMatrix().mapPoints(position); 14453 } 14454 14455 position[0] += view.mLeft; 14456 position[1] += view.mTop; 14457 14458 viewParent = view.mParent; 14459 } 14460 14461 if (viewParent instanceof ViewRootImpl) { 14462 // *cough* 14463 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14464 position[1] -= vr.mCurScrollY; 14465 } 14466 14467 location[0] = (int) (position[0] + 0.5f); 14468 location[1] = (int) (position[1] + 0.5f); 14469 } 14470 14471 /** 14472 * {@hide} 14473 * @param id the id of the view to be found 14474 * @return the view of the specified id, null if cannot be found 14475 */ 14476 protected View findViewTraversal(int id) { 14477 if (id == mID) { 14478 return this; 14479 } 14480 return null; 14481 } 14482 14483 /** 14484 * {@hide} 14485 * @param tag the tag of the view to be found 14486 * @return the view of specified tag, null if cannot be found 14487 */ 14488 protected View findViewWithTagTraversal(Object tag) { 14489 if (tag != null && tag.equals(mTag)) { 14490 return this; 14491 } 14492 return null; 14493 } 14494 14495 /** 14496 * {@hide} 14497 * @param predicate The predicate to evaluate. 14498 * @param childToSkip If not null, ignores this child during the recursive traversal. 14499 * @return The first view that matches the predicate or null. 14500 */ 14501 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14502 if (predicate.apply(this)) { 14503 return this; 14504 } 14505 return null; 14506 } 14507 14508 /** 14509 * Look for a child view with the given id. If this view has the given 14510 * id, return this view. 14511 * 14512 * @param id The id to search for. 14513 * @return The view that has the given id in the hierarchy or null 14514 */ 14515 public final View findViewById(int id) { 14516 if (id < 0) { 14517 return null; 14518 } 14519 return findViewTraversal(id); 14520 } 14521 14522 /** 14523 * Finds a view by its unuque and stable accessibility id. 14524 * 14525 * @param accessibilityId The searched accessibility id. 14526 * @return The found view. 14527 */ 14528 final View findViewByAccessibilityId(int accessibilityId) { 14529 if (accessibilityId < 0) { 14530 return null; 14531 } 14532 return findViewByAccessibilityIdTraversal(accessibilityId); 14533 } 14534 14535 /** 14536 * Performs the traversal to find a view by its unuque and stable accessibility id. 14537 * 14538 * <strong>Note:</strong>This method does not stop at the root namespace 14539 * boundary since the user can touch the screen at an arbitrary location 14540 * potentially crossing the root namespace bounday which will send an 14541 * accessibility event to accessibility services and they should be able 14542 * to obtain the event source. Also accessibility ids are guaranteed to be 14543 * unique in the window. 14544 * 14545 * @param accessibilityId The accessibility id. 14546 * @return The found view. 14547 */ 14548 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14549 if (getAccessibilityViewId() == accessibilityId) { 14550 return this; 14551 } 14552 return null; 14553 } 14554 14555 /** 14556 * Look for a child view with the given tag. If this view has the given 14557 * tag, return this view. 14558 * 14559 * @param tag The tag to search for, using "tag.equals(getTag())". 14560 * @return The View that has the given tag in the hierarchy or null 14561 */ 14562 public final View findViewWithTag(Object tag) { 14563 if (tag == null) { 14564 return null; 14565 } 14566 return findViewWithTagTraversal(tag); 14567 } 14568 14569 /** 14570 * {@hide} 14571 * Look for a child view that matches the specified predicate. 14572 * If this view matches the predicate, return this view. 14573 * 14574 * @param predicate The predicate to evaluate. 14575 * @return The first view that matches the predicate or null. 14576 */ 14577 public final View findViewByPredicate(Predicate<View> predicate) { 14578 return findViewByPredicateTraversal(predicate, null); 14579 } 14580 14581 /** 14582 * {@hide} 14583 * Look for a child view that matches the specified predicate, 14584 * starting with the specified view and its descendents and then 14585 * recusively searching the ancestors and siblings of that view 14586 * until this view is reached. 14587 * 14588 * This method is useful in cases where the predicate does not match 14589 * a single unique view (perhaps multiple views use the same id) 14590 * and we are trying to find the view that is "closest" in scope to the 14591 * starting view. 14592 * 14593 * @param start The view to start from. 14594 * @param predicate The predicate to evaluate. 14595 * @return The first view that matches the predicate or null. 14596 */ 14597 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14598 View childToSkip = null; 14599 for (;;) { 14600 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14601 if (view != null || start == this) { 14602 return view; 14603 } 14604 14605 ViewParent parent = start.getParent(); 14606 if (parent == null || !(parent instanceof View)) { 14607 return null; 14608 } 14609 14610 childToSkip = start; 14611 start = (View) parent; 14612 } 14613 } 14614 14615 /** 14616 * Sets the identifier for this view. The identifier does not have to be 14617 * unique in this view's hierarchy. The identifier should be a positive 14618 * number. 14619 * 14620 * @see #NO_ID 14621 * @see #getId() 14622 * @see #findViewById(int) 14623 * 14624 * @param id a number used to identify the view 14625 * 14626 * @attr ref android.R.styleable#View_id 14627 */ 14628 public void setId(int id) { 14629 mID = id; 14630 } 14631 14632 /** 14633 * {@hide} 14634 * 14635 * @param isRoot true if the view belongs to the root namespace, false 14636 * otherwise 14637 */ 14638 public void setIsRootNamespace(boolean isRoot) { 14639 if (isRoot) { 14640 mPrivateFlags |= IS_ROOT_NAMESPACE; 14641 } else { 14642 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14643 } 14644 } 14645 14646 /** 14647 * {@hide} 14648 * 14649 * @return true if the view belongs to the root namespace, false otherwise 14650 */ 14651 public boolean isRootNamespace() { 14652 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14653 } 14654 14655 /** 14656 * Returns this view's identifier. 14657 * 14658 * @return a positive integer used to identify the view or {@link #NO_ID} 14659 * if the view has no ID 14660 * 14661 * @see #setId(int) 14662 * @see #findViewById(int) 14663 * @attr ref android.R.styleable#View_id 14664 */ 14665 @ViewDebug.CapturedViewProperty 14666 public int getId() { 14667 return mID; 14668 } 14669 14670 /** 14671 * Returns this view's tag. 14672 * 14673 * @return the Object stored in this view as a tag 14674 * 14675 * @see #setTag(Object) 14676 * @see #getTag(int) 14677 */ 14678 @ViewDebug.ExportedProperty 14679 public Object getTag() { 14680 return mTag; 14681 } 14682 14683 /** 14684 * Sets the tag associated with this view. A tag can be used to mark 14685 * a view in its hierarchy and does not have to be unique within the 14686 * hierarchy. Tags can also be used to store data within a view without 14687 * resorting to another data structure. 14688 * 14689 * @param tag an Object to tag the view with 14690 * 14691 * @see #getTag() 14692 * @see #setTag(int, Object) 14693 */ 14694 public void setTag(final Object tag) { 14695 mTag = tag; 14696 } 14697 14698 /** 14699 * Returns the tag associated with this view and the specified key. 14700 * 14701 * @param key The key identifying the tag 14702 * 14703 * @return the Object stored in this view as a tag 14704 * 14705 * @see #setTag(int, Object) 14706 * @see #getTag() 14707 */ 14708 public Object getTag(int key) { 14709 if (mKeyedTags != null) return mKeyedTags.get(key); 14710 return null; 14711 } 14712 14713 /** 14714 * Sets a tag associated with this view and a key. A tag can be used 14715 * to mark a view in its hierarchy and does not have to be unique within 14716 * the hierarchy. Tags can also be used to store data within a view 14717 * without resorting to another data structure. 14718 * 14719 * The specified key should be an id declared in the resources of the 14720 * application to ensure it is unique (see the <a 14721 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14722 * Keys identified as belonging to 14723 * the Android framework or not associated with any package will cause 14724 * an {@link IllegalArgumentException} to be thrown. 14725 * 14726 * @param key The key identifying the tag 14727 * @param tag An Object to tag the view with 14728 * 14729 * @throws IllegalArgumentException If they specified key is not valid 14730 * 14731 * @see #setTag(Object) 14732 * @see #getTag(int) 14733 */ 14734 public void setTag(int key, final Object tag) { 14735 // If the package id is 0x00 or 0x01, it's either an undefined package 14736 // or a framework id 14737 if ((key >>> 24) < 2) { 14738 throw new IllegalArgumentException("The key must be an application-specific " 14739 + "resource id."); 14740 } 14741 14742 setKeyedTag(key, tag); 14743 } 14744 14745 /** 14746 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14747 * framework id. 14748 * 14749 * @hide 14750 */ 14751 public void setTagInternal(int key, Object tag) { 14752 if ((key >>> 24) != 0x1) { 14753 throw new IllegalArgumentException("The key must be a framework-specific " 14754 + "resource id."); 14755 } 14756 14757 setKeyedTag(key, tag); 14758 } 14759 14760 private void setKeyedTag(int key, Object tag) { 14761 if (mKeyedTags == null) { 14762 mKeyedTags = new SparseArray<Object>(); 14763 } 14764 14765 mKeyedTags.put(key, tag); 14766 } 14767 14768 /** 14769 * @param consistency The type of consistency. See ViewDebug for more information. 14770 * 14771 * @hide 14772 */ 14773 protected boolean dispatchConsistencyCheck(int consistency) { 14774 return onConsistencyCheck(consistency); 14775 } 14776 14777 /** 14778 * Method that subclasses should implement to check their consistency. The type of 14779 * consistency check is indicated by the bit field passed as a parameter. 14780 * 14781 * @param consistency The type of consistency. See ViewDebug for more information. 14782 * 14783 * @throws IllegalStateException if the view is in an inconsistent state. 14784 * 14785 * @hide 14786 */ 14787 protected boolean onConsistencyCheck(int consistency) { 14788 boolean result = true; 14789 14790 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14791 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14792 14793 if (checkLayout) { 14794 if (getParent() == null) { 14795 result = false; 14796 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14797 "View " + this + " does not have a parent."); 14798 } 14799 14800 if (mAttachInfo == null) { 14801 result = false; 14802 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14803 "View " + this + " is not attached to a window."); 14804 } 14805 } 14806 14807 if (checkDrawing) { 14808 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14809 // from their draw() method 14810 14811 if ((mPrivateFlags & DRAWN) != DRAWN && 14812 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14813 result = false; 14814 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14815 "View " + this + " was invalidated but its drawing cache is valid."); 14816 } 14817 } 14818 14819 return result; 14820 } 14821 14822 /** 14823 * Prints information about this view in the log output, with the tag 14824 * {@link #VIEW_LOG_TAG}. 14825 * 14826 * @hide 14827 */ 14828 public void debug() { 14829 debug(0); 14830 } 14831 14832 /** 14833 * Prints information about this view in the log output, with the tag 14834 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14835 * indentation defined by the <code>depth</code>. 14836 * 14837 * @param depth the indentation level 14838 * 14839 * @hide 14840 */ 14841 protected void debug(int depth) { 14842 String output = debugIndent(depth - 1); 14843 14844 output += "+ " + this; 14845 int id = getId(); 14846 if (id != -1) { 14847 output += " (id=" + id + ")"; 14848 } 14849 Object tag = getTag(); 14850 if (tag != null) { 14851 output += " (tag=" + tag + ")"; 14852 } 14853 Log.d(VIEW_LOG_TAG, output); 14854 14855 if ((mPrivateFlags & FOCUSED) != 0) { 14856 output = debugIndent(depth) + " FOCUSED"; 14857 Log.d(VIEW_LOG_TAG, output); 14858 } 14859 14860 output = debugIndent(depth); 14861 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14862 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14863 + "} "; 14864 Log.d(VIEW_LOG_TAG, output); 14865 14866 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14867 || mPaddingBottom != 0) { 14868 output = debugIndent(depth); 14869 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14870 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14871 Log.d(VIEW_LOG_TAG, output); 14872 } 14873 14874 output = debugIndent(depth); 14875 output += "mMeasureWidth=" + mMeasuredWidth + 14876 " mMeasureHeight=" + mMeasuredHeight; 14877 Log.d(VIEW_LOG_TAG, output); 14878 14879 output = debugIndent(depth); 14880 if (mLayoutParams == null) { 14881 output += "BAD! no layout params"; 14882 } else { 14883 output = mLayoutParams.debug(output); 14884 } 14885 Log.d(VIEW_LOG_TAG, output); 14886 14887 output = debugIndent(depth); 14888 output += "flags={"; 14889 output += View.printFlags(mViewFlags); 14890 output += "}"; 14891 Log.d(VIEW_LOG_TAG, output); 14892 14893 output = debugIndent(depth); 14894 output += "privateFlags={"; 14895 output += View.printPrivateFlags(mPrivateFlags); 14896 output += "}"; 14897 Log.d(VIEW_LOG_TAG, output); 14898 } 14899 14900 /** 14901 * Creates a string of whitespaces used for indentation. 14902 * 14903 * @param depth the indentation level 14904 * @return a String containing (depth * 2 + 3) * 2 white spaces 14905 * 14906 * @hide 14907 */ 14908 protected static String debugIndent(int depth) { 14909 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14910 for (int i = 0; i < (depth * 2) + 3; i++) { 14911 spaces.append(' ').append(' '); 14912 } 14913 return spaces.toString(); 14914 } 14915 14916 /** 14917 * <p>Return the offset of the widget's text baseline from the widget's top 14918 * boundary. If this widget does not support baseline alignment, this 14919 * method returns -1. </p> 14920 * 14921 * @return the offset of the baseline within the widget's bounds or -1 14922 * if baseline alignment is not supported 14923 */ 14924 @ViewDebug.ExportedProperty(category = "layout") 14925 public int getBaseline() { 14926 return -1; 14927 } 14928 14929 /** 14930 * Call this when something has changed which has invalidated the 14931 * layout of this view. This will schedule a layout pass of the view 14932 * tree. 14933 */ 14934 public void requestLayout() { 14935 if (ViewDebug.TRACE_HIERARCHY) { 14936 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14937 } 14938 14939 mPrivateFlags |= FORCE_LAYOUT; 14940 mPrivateFlags |= INVALIDATED; 14941 14942 if (mLayoutParams != null) { 14943 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14944 } 14945 14946 if (mParent != null && !mParent.isLayoutRequested()) { 14947 mParent.requestLayout(); 14948 } 14949 } 14950 14951 /** 14952 * Forces this view to be laid out during the next layout pass. 14953 * This method does not call requestLayout() or forceLayout() 14954 * on the parent. 14955 */ 14956 public void forceLayout() { 14957 mPrivateFlags |= FORCE_LAYOUT; 14958 mPrivateFlags |= INVALIDATED; 14959 } 14960 14961 /** 14962 * <p> 14963 * This is called to find out how big a view should be. The parent 14964 * supplies constraint information in the width and height parameters. 14965 * </p> 14966 * 14967 * <p> 14968 * The actual measurement work of a view is performed in 14969 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14970 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14971 * </p> 14972 * 14973 * 14974 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14975 * parent 14976 * @param heightMeasureSpec Vertical space requirements as imposed by the 14977 * parent 14978 * 14979 * @see #onMeasure(int, int) 14980 */ 14981 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14982 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14983 widthMeasureSpec != mOldWidthMeasureSpec || 14984 heightMeasureSpec != mOldHeightMeasureSpec) { 14985 14986 // first clears the measured dimension flag 14987 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14988 14989 if (ViewDebug.TRACE_HIERARCHY) { 14990 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14991 } 14992 14993 // measure ourselves, this should set the measured dimension flag back 14994 onMeasure(widthMeasureSpec, heightMeasureSpec); 14995 14996 // flag not set, setMeasuredDimension() was not invoked, we raise 14997 // an exception to warn the developer 14998 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14999 throw new IllegalStateException("onMeasure() did not set the" 15000 + " measured dimension by calling" 15001 + " setMeasuredDimension()"); 15002 } 15003 15004 mPrivateFlags |= LAYOUT_REQUIRED; 15005 } 15006 15007 mOldWidthMeasureSpec = widthMeasureSpec; 15008 mOldHeightMeasureSpec = heightMeasureSpec; 15009 } 15010 15011 /** 15012 * <p> 15013 * Measure the view and its content to determine the measured width and the 15014 * measured height. This method is invoked by {@link #measure(int, int)} and 15015 * should be overriden by subclasses to provide accurate and efficient 15016 * measurement of their contents. 15017 * </p> 15018 * 15019 * <p> 15020 * <strong>CONTRACT:</strong> When overriding this method, you 15021 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15022 * measured width and height of this view. Failure to do so will trigger an 15023 * <code>IllegalStateException</code>, thrown by 15024 * {@link #measure(int, int)}. Calling the superclass' 15025 * {@link #onMeasure(int, int)} is a valid use. 15026 * </p> 15027 * 15028 * <p> 15029 * The base class implementation of measure defaults to the background size, 15030 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15031 * override {@link #onMeasure(int, int)} to provide better measurements of 15032 * their content. 15033 * </p> 15034 * 15035 * <p> 15036 * If this method is overridden, it is the subclass's responsibility to make 15037 * sure the measured height and width are at least the view's minimum height 15038 * and width ({@link #getSuggestedMinimumHeight()} and 15039 * {@link #getSuggestedMinimumWidth()}). 15040 * </p> 15041 * 15042 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15043 * The requirements are encoded with 15044 * {@link android.view.View.MeasureSpec}. 15045 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15046 * The requirements are encoded with 15047 * {@link android.view.View.MeasureSpec}. 15048 * 15049 * @see #getMeasuredWidth() 15050 * @see #getMeasuredHeight() 15051 * @see #setMeasuredDimension(int, int) 15052 * @see #getSuggestedMinimumHeight() 15053 * @see #getSuggestedMinimumWidth() 15054 * @see android.view.View.MeasureSpec#getMode(int) 15055 * @see android.view.View.MeasureSpec#getSize(int) 15056 */ 15057 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15058 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15059 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15060 } 15061 15062 /** 15063 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15064 * measured width and measured height. Failing to do so will trigger an 15065 * exception at measurement time.</p> 15066 * 15067 * @param measuredWidth The measured width of this view. May be a complex 15068 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15069 * {@link #MEASURED_STATE_TOO_SMALL}. 15070 * @param measuredHeight The measured height of this view. May be a complex 15071 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15072 * {@link #MEASURED_STATE_TOO_SMALL}. 15073 */ 15074 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15075 mMeasuredWidth = measuredWidth; 15076 mMeasuredHeight = measuredHeight; 15077 15078 mPrivateFlags |= MEASURED_DIMENSION_SET; 15079 } 15080 15081 /** 15082 * Merge two states as returned by {@link #getMeasuredState()}. 15083 * @param curState The current state as returned from a view or the result 15084 * of combining multiple views. 15085 * @param newState The new view state to combine. 15086 * @return Returns a new integer reflecting the combination of the two 15087 * states. 15088 */ 15089 public static int combineMeasuredStates(int curState, int newState) { 15090 return curState | newState; 15091 } 15092 15093 /** 15094 * Version of {@link #resolveSizeAndState(int, int, int)} 15095 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15096 */ 15097 public static int resolveSize(int size, int measureSpec) { 15098 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15099 } 15100 15101 /** 15102 * Utility to reconcile a desired size and state, with constraints imposed 15103 * by a MeasureSpec. Will take the desired size, unless a different size 15104 * is imposed by the constraints. The returned value is a compound integer, 15105 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15106 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15107 * size is smaller than the size the view wants to be. 15108 * 15109 * @param size How big the view wants to be 15110 * @param measureSpec Constraints imposed by the parent 15111 * @return Size information bit mask as defined by 15112 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15113 */ 15114 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15115 int result = size; 15116 int specMode = MeasureSpec.getMode(measureSpec); 15117 int specSize = MeasureSpec.getSize(measureSpec); 15118 switch (specMode) { 15119 case MeasureSpec.UNSPECIFIED: 15120 result = size; 15121 break; 15122 case MeasureSpec.AT_MOST: 15123 if (specSize < size) { 15124 result = specSize | MEASURED_STATE_TOO_SMALL; 15125 } else { 15126 result = size; 15127 } 15128 break; 15129 case MeasureSpec.EXACTLY: 15130 result = specSize; 15131 break; 15132 } 15133 return result | (childMeasuredState&MEASURED_STATE_MASK); 15134 } 15135 15136 /** 15137 * Utility to return a default size. Uses the supplied size if the 15138 * MeasureSpec imposed no constraints. Will get larger if allowed 15139 * by the MeasureSpec. 15140 * 15141 * @param size Default size for this view 15142 * @param measureSpec Constraints imposed by the parent 15143 * @return The size this view should be. 15144 */ 15145 public static int getDefaultSize(int size, int measureSpec) { 15146 int result = size; 15147 int specMode = MeasureSpec.getMode(measureSpec); 15148 int specSize = MeasureSpec.getSize(measureSpec); 15149 15150 switch (specMode) { 15151 case MeasureSpec.UNSPECIFIED: 15152 result = size; 15153 break; 15154 case MeasureSpec.AT_MOST: 15155 case MeasureSpec.EXACTLY: 15156 result = specSize; 15157 break; 15158 } 15159 return result; 15160 } 15161 15162 /** 15163 * Returns the suggested minimum height that the view should use. This 15164 * returns the maximum of the view's minimum height 15165 * and the background's minimum height 15166 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15167 * <p> 15168 * When being used in {@link #onMeasure(int, int)}, the caller should still 15169 * ensure the returned height is within the requirements of the parent. 15170 * 15171 * @return The suggested minimum height of the view. 15172 */ 15173 protected int getSuggestedMinimumHeight() { 15174 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15175 15176 } 15177 15178 /** 15179 * Returns the suggested minimum width that the view should use. This 15180 * returns the maximum of the view's minimum width) 15181 * and the background's minimum width 15182 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15183 * <p> 15184 * When being used in {@link #onMeasure(int, int)}, the caller should still 15185 * ensure the returned width is within the requirements of the parent. 15186 * 15187 * @return The suggested minimum width of the view. 15188 */ 15189 protected int getSuggestedMinimumWidth() { 15190 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15191 } 15192 15193 /** 15194 * Returns the minimum height of the view. 15195 * 15196 * @return the minimum height the view will try to be. 15197 * 15198 * @see #setMinimumHeight(int) 15199 * 15200 * @attr ref android.R.styleable#View_minHeight 15201 */ 15202 public int getMinimumHeight() { 15203 return mMinHeight; 15204 } 15205 15206 /** 15207 * Sets the minimum height of the view. It is not guaranteed the view will 15208 * be able to achieve this minimum height (for example, if its parent layout 15209 * constrains it with less available height). 15210 * 15211 * @param minHeight The minimum height the view will try to be. 15212 * 15213 * @see #getMinimumHeight() 15214 * 15215 * @attr ref android.R.styleable#View_minHeight 15216 */ 15217 public void setMinimumHeight(int minHeight) { 15218 mMinHeight = minHeight; 15219 requestLayout(); 15220 } 15221 15222 /** 15223 * Returns the minimum width of the view. 15224 * 15225 * @return the minimum width the view will try to be. 15226 * 15227 * @see #setMinimumWidth(int) 15228 * 15229 * @attr ref android.R.styleable#View_minWidth 15230 */ 15231 public int getMinimumWidth() { 15232 return mMinWidth; 15233 } 15234 15235 /** 15236 * Sets the minimum width of the view. It is not guaranteed the view will 15237 * be able to achieve this minimum width (for example, if its parent layout 15238 * constrains it with less available width). 15239 * 15240 * @param minWidth The minimum width the view will try to be. 15241 * 15242 * @see #getMinimumWidth() 15243 * 15244 * @attr ref android.R.styleable#View_minWidth 15245 */ 15246 public void setMinimumWidth(int minWidth) { 15247 mMinWidth = minWidth; 15248 requestLayout(); 15249 15250 } 15251 15252 /** 15253 * Get the animation currently associated with this view. 15254 * 15255 * @return The animation that is currently playing or 15256 * scheduled to play for this view. 15257 */ 15258 public Animation getAnimation() { 15259 return mCurrentAnimation; 15260 } 15261 15262 /** 15263 * Start the specified animation now. 15264 * 15265 * @param animation the animation to start now 15266 */ 15267 public void startAnimation(Animation animation) { 15268 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15269 setAnimation(animation); 15270 invalidateParentCaches(); 15271 invalidate(true); 15272 } 15273 15274 /** 15275 * Cancels any animations for this view. 15276 */ 15277 public void clearAnimation() { 15278 if (mCurrentAnimation != null) { 15279 mCurrentAnimation.detach(); 15280 } 15281 mCurrentAnimation = null; 15282 invalidateParentIfNeeded(); 15283 } 15284 15285 /** 15286 * Sets the next animation to play for this view. 15287 * If you want the animation to play immediately, use 15288 * {@link #startAnimation(android.view.animation.Animation)} instead. 15289 * This method provides allows fine-grained 15290 * control over the start time and invalidation, but you 15291 * must make sure that 1) the animation has a start time set, and 15292 * 2) the view's parent (which controls animations on its children) 15293 * will be invalidated when the animation is supposed to 15294 * start. 15295 * 15296 * @param animation The next animation, or null. 15297 */ 15298 public void setAnimation(Animation animation) { 15299 mCurrentAnimation = animation; 15300 15301 if (animation != null) { 15302 // If the screen is off assume the animation start time is now instead of 15303 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15304 // would cause the animation to start when the screen turns back on 15305 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15306 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15307 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15308 } 15309 animation.reset(); 15310 } 15311 } 15312 15313 /** 15314 * Invoked by a parent ViewGroup to notify the start of the animation 15315 * currently associated with this view. If you override this method, 15316 * always call super.onAnimationStart(); 15317 * 15318 * @see #setAnimation(android.view.animation.Animation) 15319 * @see #getAnimation() 15320 */ 15321 protected void onAnimationStart() { 15322 mPrivateFlags |= ANIMATION_STARTED; 15323 } 15324 15325 /** 15326 * Invoked by a parent ViewGroup to notify the end of the animation 15327 * currently associated with this view. If you override this method, 15328 * always call super.onAnimationEnd(); 15329 * 15330 * @see #setAnimation(android.view.animation.Animation) 15331 * @see #getAnimation() 15332 */ 15333 protected void onAnimationEnd() { 15334 mPrivateFlags &= ~ANIMATION_STARTED; 15335 } 15336 15337 /** 15338 * Invoked if there is a Transform that involves alpha. Subclass that can 15339 * draw themselves with the specified alpha should return true, and then 15340 * respect that alpha when their onDraw() is called. If this returns false 15341 * then the view may be redirected to draw into an offscreen buffer to 15342 * fulfill the request, which will look fine, but may be slower than if the 15343 * subclass handles it internally. The default implementation returns false. 15344 * 15345 * @param alpha The alpha (0..255) to apply to the view's drawing 15346 * @return true if the view can draw with the specified alpha. 15347 */ 15348 protected boolean onSetAlpha(int alpha) { 15349 return false; 15350 } 15351 15352 /** 15353 * This is used by the RootView to perform an optimization when 15354 * the view hierarchy contains one or several SurfaceView. 15355 * SurfaceView is always considered transparent, but its children are not, 15356 * therefore all View objects remove themselves from the global transparent 15357 * region (passed as a parameter to this function). 15358 * 15359 * @param region The transparent region for this ViewAncestor (window). 15360 * 15361 * @return Returns true if the effective visibility of the view at this 15362 * point is opaque, regardless of the transparent region; returns false 15363 * if it is possible for underlying windows to be seen behind the view. 15364 * 15365 * {@hide} 15366 */ 15367 public boolean gatherTransparentRegion(Region region) { 15368 final AttachInfo attachInfo = mAttachInfo; 15369 if (region != null && attachInfo != null) { 15370 final int pflags = mPrivateFlags; 15371 if ((pflags & SKIP_DRAW) == 0) { 15372 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15373 // remove it from the transparent region. 15374 final int[] location = attachInfo.mTransparentLocation; 15375 getLocationInWindow(location); 15376 region.op(location[0], location[1], location[0] + mRight - mLeft, 15377 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15378 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15379 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15380 // exists, so we remove the background drawable's non-transparent 15381 // parts from this transparent region. 15382 applyDrawableToTransparentRegion(mBackground, region); 15383 } 15384 } 15385 return true; 15386 } 15387 15388 /** 15389 * Play a sound effect for this view. 15390 * 15391 * <p>The framework will play sound effects for some built in actions, such as 15392 * clicking, but you may wish to play these effects in your widget, 15393 * for instance, for internal navigation. 15394 * 15395 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15396 * {@link #isSoundEffectsEnabled()} is true. 15397 * 15398 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15399 */ 15400 public void playSoundEffect(int soundConstant) { 15401 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15402 return; 15403 } 15404 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15405 } 15406 15407 /** 15408 * BZZZTT!!1! 15409 * 15410 * <p>Provide haptic feedback to the user for this view. 15411 * 15412 * <p>The framework will provide haptic feedback for some built in actions, 15413 * such as long presses, but you may wish to provide feedback for your 15414 * own widget. 15415 * 15416 * <p>The feedback will only be performed if 15417 * {@link #isHapticFeedbackEnabled()} is true. 15418 * 15419 * @param feedbackConstant One of the constants defined in 15420 * {@link HapticFeedbackConstants} 15421 */ 15422 public boolean performHapticFeedback(int feedbackConstant) { 15423 return performHapticFeedback(feedbackConstant, 0); 15424 } 15425 15426 /** 15427 * BZZZTT!!1! 15428 * 15429 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15430 * 15431 * @param feedbackConstant One of the constants defined in 15432 * {@link HapticFeedbackConstants} 15433 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15434 */ 15435 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15436 if (mAttachInfo == null) { 15437 return false; 15438 } 15439 //noinspection SimplifiableIfStatement 15440 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15441 && !isHapticFeedbackEnabled()) { 15442 return false; 15443 } 15444 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15445 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15446 } 15447 15448 /** 15449 * Request that the visibility of the status bar or other screen/window 15450 * decorations be changed. 15451 * 15452 * <p>This method is used to put the over device UI into temporary modes 15453 * where the user's attention is focused more on the application content, 15454 * by dimming or hiding surrounding system affordances. This is typically 15455 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15456 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15457 * to be placed behind the action bar (and with these flags other system 15458 * affordances) so that smooth transitions between hiding and showing them 15459 * can be done. 15460 * 15461 * <p>Two representative examples of the use of system UI visibility is 15462 * implementing a content browsing application (like a magazine reader) 15463 * and a video playing application. 15464 * 15465 * <p>The first code shows a typical implementation of a View in a content 15466 * browsing application. In this implementation, the application goes 15467 * into a content-oriented mode by hiding the status bar and action bar, 15468 * and putting the navigation elements into lights out mode. The user can 15469 * then interact with content while in this mode. Such an application should 15470 * provide an easy way for the user to toggle out of the mode (such as to 15471 * check information in the status bar or access notifications). In the 15472 * implementation here, this is done simply by tapping on the content. 15473 * 15474 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15475 * content} 15476 * 15477 * <p>This second code sample shows a typical implementation of a View 15478 * in a video playing application. In this situation, while the video is 15479 * playing the application would like to go into a complete full-screen mode, 15480 * to use as much of the display as possible for the video. When in this state 15481 * the user can not interact with the application; the system intercepts 15482 * touching on the screen to pop the UI out of full screen mode. See 15483 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15484 * 15485 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15486 * content} 15487 * 15488 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15489 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15490 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15491 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15492 */ 15493 public void setSystemUiVisibility(int visibility) { 15494 if (visibility != mSystemUiVisibility) { 15495 mSystemUiVisibility = visibility; 15496 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15497 mParent.recomputeViewAttributes(this); 15498 } 15499 } 15500 } 15501 15502 /** 15503 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15504 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15505 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15506 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15507 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15508 */ 15509 public int getSystemUiVisibility() { 15510 return mSystemUiVisibility; 15511 } 15512 15513 /** 15514 * Returns the current system UI visibility that is currently set for 15515 * the entire window. This is the combination of the 15516 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15517 * views in the window. 15518 */ 15519 public int getWindowSystemUiVisibility() { 15520 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15521 } 15522 15523 /** 15524 * Override to find out when the window's requested system UI visibility 15525 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15526 * This is different from the callbacks recieved through 15527 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15528 * in that this is only telling you about the local request of the window, 15529 * not the actual values applied by the system. 15530 */ 15531 public void onWindowSystemUiVisibilityChanged(int visible) { 15532 } 15533 15534 /** 15535 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15536 * the view hierarchy. 15537 */ 15538 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15539 onWindowSystemUiVisibilityChanged(visible); 15540 } 15541 15542 /** 15543 * Set a listener to receive callbacks when the visibility of the system bar changes. 15544 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15545 */ 15546 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15547 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15548 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15549 mParent.recomputeViewAttributes(this); 15550 } 15551 } 15552 15553 /** 15554 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15555 * the view hierarchy. 15556 */ 15557 public void dispatchSystemUiVisibilityChanged(int visibility) { 15558 ListenerInfo li = mListenerInfo; 15559 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15560 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15561 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15562 } 15563 } 15564 15565 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15566 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15567 if (val != mSystemUiVisibility) { 15568 setSystemUiVisibility(val); 15569 return true; 15570 } 15571 return false; 15572 } 15573 15574 /** @hide */ 15575 public void setDisabledSystemUiVisibility(int flags) { 15576 if (mAttachInfo != null) { 15577 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15578 mAttachInfo.mDisabledSystemUiVisibility = flags; 15579 if (mParent != null) { 15580 mParent.recomputeViewAttributes(this); 15581 } 15582 } 15583 } 15584 } 15585 15586 /** 15587 * Creates an image that the system displays during the drag and drop 15588 * operation. This is called a "drag shadow". The default implementation 15589 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15590 * appearance as the given View. The default also positions the center of the drag shadow 15591 * directly under the touch point. If no View is provided (the constructor with no parameters 15592 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15593 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15594 * default is an invisible drag shadow. 15595 * <p> 15596 * You are not required to use the View you provide to the constructor as the basis of the 15597 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15598 * anything you want as the drag shadow. 15599 * </p> 15600 * <p> 15601 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15602 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15603 * size and position of the drag shadow. It uses this data to construct a 15604 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15605 * so that your application can draw the shadow image in the Canvas. 15606 * </p> 15607 * 15608 * <div class="special reference"> 15609 * <h3>Developer Guides</h3> 15610 * <p>For a guide to implementing drag and drop features, read the 15611 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15612 * </div> 15613 */ 15614 public static class DragShadowBuilder { 15615 private final WeakReference<View> mView; 15616 15617 /** 15618 * Constructs a shadow image builder based on a View. By default, the resulting drag 15619 * shadow will have the same appearance and dimensions as the View, with the touch point 15620 * over the center of the View. 15621 * @param view A View. Any View in scope can be used. 15622 */ 15623 public DragShadowBuilder(View view) { 15624 mView = new WeakReference<View>(view); 15625 } 15626 15627 /** 15628 * Construct a shadow builder object with no associated View. This 15629 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15630 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15631 * to supply the drag shadow's dimensions and appearance without 15632 * reference to any View object. If they are not overridden, then the result is an 15633 * invisible drag shadow. 15634 */ 15635 public DragShadowBuilder() { 15636 mView = new WeakReference<View>(null); 15637 } 15638 15639 /** 15640 * Returns the View object that had been passed to the 15641 * {@link #View.DragShadowBuilder(View)} 15642 * constructor. If that View parameter was {@code null} or if the 15643 * {@link #View.DragShadowBuilder()} 15644 * constructor was used to instantiate the builder object, this method will return 15645 * null. 15646 * 15647 * @return The View object associate with this builder object. 15648 */ 15649 @SuppressWarnings({"JavadocReference"}) 15650 final public View getView() { 15651 return mView.get(); 15652 } 15653 15654 /** 15655 * Provides the metrics for the shadow image. These include the dimensions of 15656 * the shadow image, and the point within that shadow that should 15657 * be centered under the touch location while dragging. 15658 * <p> 15659 * The default implementation sets the dimensions of the shadow to be the 15660 * same as the dimensions of the View itself and centers the shadow under 15661 * the touch point. 15662 * </p> 15663 * 15664 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15665 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15666 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15667 * image. 15668 * 15669 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15670 * shadow image that should be underneath the touch point during the drag and drop 15671 * operation. Your application must set {@link android.graphics.Point#x} to the 15672 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15673 */ 15674 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15675 final View view = mView.get(); 15676 if (view != null) { 15677 shadowSize.set(view.getWidth(), view.getHeight()); 15678 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15679 } else { 15680 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15681 } 15682 } 15683 15684 /** 15685 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15686 * based on the dimensions it received from the 15687 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15688 * 15689 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15690 */ 15691 public void onDrawShadow(Canvas canvas) { 15692 final View view = mView.get(); 15693 if (view != null) { 15694 view.draw(canvas); 15695 } else { 15696 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15697 } 15698 } 15699 } 15700 15701 /** 15702 * Starts a drag and drop operation. When your application calls this method, it passes a 15703 * {@link android.view.View.DragShadowBuilder} object to the system. The 15704 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15705 * to get metrics for the drag shadow, and then calls the object's 15706 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15707 * <p> 15708 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15709 * drag events to all the View objects in your application that are currently visible. It does 15710 * this either by calling the View object's drag listener (an implementation of 15711 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15712 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15713 * Both are passed a {@link android.view.DragEvent} object that has a 15714 * {@link android.view.DragEvent#getAction()} value of 15715 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15716 * </p> 15717 * <p> 15718 * Your application can invoke startDrag() on any attached View object. The View object does not 15719 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15720 * be related to the View the user selected for dragging. 15721 * </p> 15722 * @param data A {@link android.content.ClipData} object pointing to the data to be 15723 * transferred by the drag and drop operation. 15724 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15725 * drag shadow. 15726 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15727 * drop operation. This Object is put into every DragEvent object sent by the system during the 15728 * current drag. 15729 * <p> 15730 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15731 * to the target Views. For example, it can contain flags that differentiate between a 15732 * a copy operation and a move operation. 15733 * </p> 15734 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15735 * so the parameter should be set to 0. 15736 * @return {@code true} if the method completes successfully, or 15737 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15738 * do a drag, and so no drag operation is in progress. 15739 */ 15740 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15741 Object myLocalState, int flags) { 15742 if (ViewDebug.DEBUG_DRAG) { 15743 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15744 } 15745 boolean okay = false; 15746 15747 Point shadowSize = new Point(); 15748 Point shadowTouchPoint = new Point(); 15749 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15750 15751 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15752 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15753 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15754 } 15755 15756 if (ViewDebug.DEBUG_DRAG) { 15757 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15758 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15759 } 15760 Surface surface = new Surface(); 15761 try { 15762 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15763 flags, shadowSize.x, shadowSize.y, surface); 15764 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15765 + " surface=" + surface); 15766 if (token != null) { 15767 Canvas canvas = surface.lockCanvas(null); 15768 try { 15769 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15770 shadowBuilder.onDrawShadow(canvas); 15771 } finally { 15772 surface.unlockCanvasAndPost(canvas); 15773 } 15774 15775 final ViewRootImpl root = getViewRootImpl(); 15776 15777 // Cache the local state object for delivery with DragEvents 15778 root.setLocalDragState(myLocalState); 15779 15780 // repurpose 'shadowSize' for the last touch point 15781 root.getLastTouchPoint(shadowSize); 15782 15783 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15784 shadowSize.x, shadowSize.y, 15785 shadowTouchPoint.x, shadowTouchPoint.y, data); 15786 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15787 15788 // Off and running! Release our local surface instance; the drag 15789 // shadow surface is now managed by the system process. 15790 surface.release(); 15791 } 15792 } catch (Exception e) { 15793 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15794 surface.destroy(); 15795 } 15796 15797 return okay; 15798 } 15799 15800 /** 15801 * Handles drag events sent by the system following a call to 15802 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15803 *<p> 15804 * When the system calls this method, it passes a 15805 * {@link android.view.DragEvent} object. A call to 15806 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15807 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15808 * operation. 15809 * @param event The {@link android.view.DragEvent} sent by the system. 15810 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15811 * in DragEvent, indicating the type of drag event represented by this object. 15812 * @return {@code true} if the method was successful, otherwise {@code false}. 15813 * <p> 15814 * The method should return {@code true} in response to an action type of 15815 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15816 * operation. 15817 * </p> 15818 * <p> 15819 * The method should also return {@code true} in response to an action type of 15820 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15821 * {@code false} if it didn't. 15822 * </p> 15823 */ 15824 public boolean onDragEvent(DragEvent event) { 15825 return false; 15826 } 15827 15828 /** 15829 * Detects if this View is enabled and has a drag event listener. 15830 * If both are true, then it calls the drag event listener with the 15831 * {@link android.view.DragEvent} it received. If the drag event listener returns 15832 * {@code true}, then dispatchDragEvent() returns {@code true}. 15833 * <p> 15834 * For all other cases, the method calls the 15835 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15836 * method and returns its result. 15837 * </p> 15838 * <p> 15839 * This ensures that a drag event is always consumed, even if the View does not have a drag 15840 * event listener. However, if the View has a listener and the listener returns true, then 15841 * onDragEvent() is not called. 15842 * </p> 15843 */ 15844 public boolean dispatchDragEvent(DragEvent event) { 15845 //noinspection SimplifiableIfStatement 15846 ListenerInfo li = mListenerInfo; 15847 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15848 && li.mOnDragListener.onDrag(this, event)) { 15849 return true; 15850 } 15851 return onDragEvent(event); 15852 } 15853 15854 boolean canAcceptDrag() { 15855 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15856 } 15857 15858 /** 15859 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15860 * it is ever exposed at all. 15861 * @hide 15862 */ 15863 public void onCloseSystemDialogs(String reason) { 15864 } 15865 15866 /** 15867 * Given a Drawable whose bounds have been set to draw into this view, 15868 * update a Region being computed for 15869 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15870 * that any non-transparent parts of the Drawable are removed from the 15871 * given transparent region. 15872 * 15873 * @param dr The Drawable whose transparency is to be applied to the region. 15874 * @param region A Region holding the current transparency information, 15875 * where any parts of the region that are set are considered to be 15876 * transparent. On return, this region will be modified to have the 15877 * transparency information reduced by the corresponding parts of the 15878 * Drawable that are not transparent. 15879 * {@hide} 15880 */ 15881 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15882 if (DBG) { 15883 Log.i("View", "Getting transparent region for: " + this); 15884 } 15885 final Region r = dr.getTransparentRegion(); 15886 final Rect db = dr.getBounds(); 15887 final AttachInfo attachInfo = mAttachInfo; 15888 if (r != null && attachInfo != null) { 15889 final int w = getRight()-getLeft(); 15890 final int h = getBottom()-getTop(); 15891 if (db.left > 0) { 15892 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15893 r.op(0, 0, db.left, h, Region.Op.UNION); 15894 } 15895 if (db.right < w) { 15896 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15897 r.op(db.right, 0, w, h, Region.Op.UNION); 15898 } 15899 if (db.top > 0) { 15900 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15901 r.op(0, 0, w, db.top, Region.Op.UNION); 15902 } 15903 if (db.bottom < h) { 15904 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15905 r.op(0, db.bottom, w, h, Region.Op.UNION); 15906 } 15907 final int[] location = attachInfo.mTransparentLocation; 15908 getLocationInWindow(location); 15909 r.translate(location[0], location[1]); 15910 region.op(r, Region.Op.INTERSECT); 15911 } else { 15912 region.op(db, Region.Op.DIFFERENCE); 15913 } 15914 } 15915 15916 private void checkForLongClick(int delayOffset) { 15917 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15918 mHasPerformedLongPress = false; 15919 15920 if (mPendingCheckForLongPress == null) { 15921 mPendingCheckForLongPress = new CheckForLongPress(); 15922 } 15923 mPendingCheckForLongPress.rememberWindowAttachCount(); 15924 postDelayed(mPendingCheckForLongPress, 15925 ViewConfiguration.getLongPressTimeout() - delayOffset); 15926 } 15927 } 15928 15929 /** 15930 * Inflate a view from an XML resource. This convenience method wraps the {@link 15931 * LayoutInflater} class, which provides a full range of options for view inflation. 15932 * 15933 * @param context The Context object for your activity or application. 15934 * @param resource The resource ID to inflate 15935 * @param root A view group that will be the parent. Used to properly inflate the 15936 * layout_* parameters. 15937 * @see LayoutInflater 15938 */ 15939 public static View inflate(Context context, int resource, ViewGroup root) { 15940 LayoutInflater factory = LayoutInflater.from(context); 15941 return factory.inflate(resource, root); 15942 } 15943 15944 /** 15945 * Scroll the view with standard behavior for scrolling beyond the normal 15946 * content boundaries. Views that call this method should override 15947 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15948 * results of an over-scroll operation. 15949 * 15950 * Views can use this method to handle any touch or fling-based scrolling. 15951 * 15952 * @param deltaX Change in X in pixels 15953 * @param deltaY Change in Y in pixels 15954 * @param scrollX Current X scroll value in pixels before applying deltaX 15955 * @param scrollY Current Y scroll value in pixels before applying deltaY 15956 * @param scrollRangeX Maximum content scroll range along the X axis 15957 * @param scrollRangeY Maximum content scroll range along the Y axis 15958 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15959 * along the X axis. 15960 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15961 * along the Y axis. 15962 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15963 * @return true if scrolling was clamped to an over-scroll boundary along either 15964 * axis, false otherwise. 15965 */ 15966 @SuppressWarnings({"UnusedParameters"}) 15967 protected boolean overScrollBy(int deltaX, int deltaY, 15968 int scrollX, int scrollY, 15969 int scrollRangeX, int scrollRangeY, 15970 int maxOverScrollX, int maxOverScrollY, 15971 boolean isTouchEvent) { 15972 final int overScrollMode = mOverScrollMode; 15973 final boolean canScrollHorizontal = 15974 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15975 final boolean canScrollVertical = 15976 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15977 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15978 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15979 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15980 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15981 15982 int newScrollX = scrollX + deltaX; 15983 if (!overScrollHorizontal) { 15984 maxOverScrollX = 0; 15985 } 15986 15987 int newScrollY = scrollY + deltaY; 15988 if (!overScrollVertical) { 15989 maxOverScrollY = 0; 15990 } 15991 15992 // Clamp values if at the limits and record 15993 final int left = -maxOverScrollX; 15994 final int right = maxOverScrollX + scrollRangeX; 15995 final int top = -maxOverScrollY; 15996 final int bottom = maxOverScrollY + scrollRangeY; 15997 15998 boolean clampedX = false; 15999 if (newScrollX > right) { 16000 newScrollX = right; 16001 clampedX = true; 16002 } else if (newScrollX < left) { 16003 newScrollX = left; 16004 clampedX = true; 16005 } 16006 16007 boolean clampedY = false; 16008 if (newScrollY > bottom) { 16009 newScrollY = bottom; 16010 clampedY = true; 16011 } else if (newScrollY < top) { 16012 newScrollY = top; 16013 clampedY = true; 16014 } 16015 16016 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16017 16018 return clampedX || clampedY; 16019 } 16020 16021 /** 16022 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16023 * respond to the results of an over-scroll operation. 16024 * 16025 * @param scrollX New X scroll value in pixels 16026 * @param scrollY New Y scroll value in pixels 16027 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16028 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16029 */ 16030 protected void onOverScrolled(int scrollX, int scrollY, 16031 boolean clampedX, boolean clampedY) { 16032 // Intentionally empty. 16033 } 16034 16035 /** 16036 * Returns the over-scroll mode for this view. The result will be 16037 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16038 * (allow over-scrolling only if the view content is larger than the container), 16039 * or {@link #OVER_SCROLL_NEVER}. 16040 * 16041 * @return This view's over-scroll mode. 16042 */ 16043 public int getOverScrollMode() { 16044 return mOverScrollMode; 16045 } 16046 16047 /** 16048 * Set the over-scroll mode for this view. Valid over-scroll modes are 16049 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16050 * (allow over-scrolling only if the view content is larger than the container), 16051 * or {@link #OVER_SCROLL_NEVER}. 16052 * 16053 * Setting the over-scroll mode of a view will have an effect only if the 16054 * view is capable of scrolling. 16055 * 16056 * @param overScrollMode The new over-scroll mode for this view. 16057 */ 16058 public void setOverScrollMode(int overScrollMode) { 16059 if (overScrollMode != OVER_SCROLL_ALWAYS && 16060 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16061 overScrollMode != OVER_SCROLL_NEVER) { 16062 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16063 } 16064 mOverScrollMode = overScrollMode; 16065 } 16066 16067 /** 16068 * Gets a scale factor that determines the distance the view should scroll 16069 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16070 * @return The vertical scroll scale factor. 16071 * @hide 16072 */ 16073 protected float getVerticalScrollFactor() { 16074 if (mVerticalScrollFactor == 0) { 16075 TypedValue outValue = new TypedValue(); 16076 if (!mContext.getTheme().resolveAttribute( 16077 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16078 throw new IllegalStateException( 16079 "Expected theme to define listPreferredItemHeight."); 16080 } 16081 mVerticalScrollFactor = outValue.getDimension( 16082 mContext.getResources().getDisplayMetrics()); 16083 } 16084 return mVerticalScrollFactor; 16085 } 16086 16087 /** 16088 * Gets a scale factor that determines the distance the view should scroll 16089 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16090 * @return The horizontal scroll scale factor. 16091 * @hide 16092 */ 16093 protected float getHorizontalScrollFactor() { 16094 // TODO: Should use something else. 16095 return getVerticalScrollFactor(); 16096 } 16097 16098 /** 16099 * Return the value specifying the text direction or policy that was set with 16100 * {@link #setTextDirection(int)}. 16101 * 16102 * @return the defined text direction. It can be one of: 16103 * 16104 * {@link #TEXT_DIRECTION_INHERIT}, 16105 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16106 * {@link #TEXT_DIRECTION_ANY_RTL}, 16107 * {@link #TEXT_DIRECTION_LTR}, 16108 * {@link #TEXT_DIRECTION_RTL}, 16109 * {@link #TEXT_DIRECTION_LOCALE} 16110 */ 16111 @ViewDebug.ExportedProperty(category = "text", mapping = { 16112 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16113 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16114 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16115 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16116 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16117 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16118 }) 16119 public int getTextDirection() { 16120 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16121 } 16122 16123 /** 16124 * Set the text direction. 16125 * 16126 * @param textDirection the direction to set. Should be one of: 16127 * 16128 * {@link #TEXT_DIRECTION_INHERIT}, 16129 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16130 * {@link #TEXT_DIRECTION_ANY_RTL}, 16131 * {@link #TEXT_DIRECTION_LTR}, 16132 * {@link #TEXT_DIRECTION_RTL}, 16133 * {@link #TEXT_DIRECTION_LOCALE} 16134 */ 16135 public void setTextDirection(int textDirection) { 16136 if (getTextDirection() != textDirection) { 16137 // Reset the current text direction and the resolved one 16138 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16139 resetResolvedTextDirection(); 16140 // Set the new text direction 16141 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16142 // Refresh 16143 requestLayout(); 16144 invalidate(true); 16145 } 16146 } 16147 16148 /** 16149 * Return the resolved text direction. 16150 * 16151 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16152 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16153 * up the parent chain of the view. if there is no parent, then it will return the default 16154 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16155 * 16156 * @return the resolved text direction. Returns one of: 16157 * 16158 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16159 * {@link #TEXT_DIRECTION_ANY_RTL}, 16160 * {@link #TEXT_DIRECTION_LTR}, 16161 * {@link #TEXT_DIRECTION_RTL}, 16162 * {@link #TEXT_DIRECTION_LOCALE} 16163 */ 16164 public int getResolvedTextDirection() { 16165 // The text direction will be resolved only if needed 16166 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16167 resolveTextDirection(); 16168 } 16169 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16170 } 16171 16172 /** 16173 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16174 * resolution is done. 16175 */ 16176 public void resolveTextDirection() { 16177 // Reset any previous text direction resolution 16178 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16179 16180 if (hasRtlSupport()) { 16181 // Set resolved text direction flag depending on text direction flag 16182 final int textDirection = getTextDirection(); 16183 switch(textDirection) { 16184 case TEXT_DIRECTION_INHERIT: 16185 if (canResolveTextDirection()) { 16186 ViewGroup viewGroup = ((ViewGroup) mParent); 16187 16188 // Set current resolved direction to the same value as the parent's one 16189 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16190 switch (parentResolvedDirection) { 16191 case TEXT_DIRECTION_FIRST_STRONG: 16192 case TEXT_DIRECTION_ANY_RTL: 16193 case TEXT_DIRECTION_LTR: 16194 case TEXT_DIRECTION_RTL: 16195 case TEXT_DIRECTION_LOCALE: 16196 mPrivateFlags2 |= 16197 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16198 break; 16199 default: 16200 // Default resolved direction is "first strong" heuristic 16201 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16202 } 16203 } else { 16204 // We cannot do the resolution if there is no parent, so use the default one 16205 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16206 } 16207 break; 16208 case TEXT_DIRECTION_FIRST_STRONG: 16209 case TEXT_DIRECTION_ANY_RTL: 16210 case TEXT_DIRECTION_LTR: 16211 case TEXT_DIRECTION_RTL: 16212 case TEXT_DIRECTION_LOCALE: 16213 // Resolved direction is the same as text direction 16214 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16215 break; 16216 default: 16217 // Default resolved direction is "first strong" heuristic 16218 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16219 } 16220 } else { 16221 // Default resolved direction is "first strong" heuristic 16222 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16223 } 16224 16225 // Set to resolved 16226 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16227 onResolvedTextDirectionChanged(); 16228 } 16229 16230 /** 16231 * Called when text direction has been resolved. Subclasses that care about text direction 16232 * resolution should override this method. 16233 * 16234 * The default implementation does nothing. 16235 */ 16236 public void onResolvedTextDirectionChanged() { 16237 } 16238 16239 /** 16240 * Check if text direction resolution can be done. 16241 * 16242 * @return true if text direction resolution can be done otherwise return false. 16243 */ 16244 public boolean canResolveTextDirection() { 16245 switch (getTextDirection()) { 16246 case TEXT_DIRECTION_INHERIT: 16247 return (mParent != null) && (mParent instanceof ViewGroup); 16248 default: 16249 return true; 16250 } 16251 } 16252 16253 /** 16254 * Reset resolved text direction. Text direction can be resolved with a call to 16255 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16256 * reset is done. 16257 */ 16258 public void resetResolvedTextDirection() { 16259 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16260 onResolvedTextDirectionReset(); 16261 } 16262 16263 /** 16264 * Called when text direction is reset. Subclasses that care about text direction reset should 16265 * override this method and do a reset of the text direction of their children. The default 16266 * implementation does nothing. 16267 */ 16268 public void onResolvedTextDirectionReset() { 16269 } 16270 16271 /** 16272 * Return the value specifying the text alignment or policy that was set with 16273 * {@link #setTextAlignment(int)}. 16274 * 16275 * @return the defined text alignment. It can be one of: 16276 * 16277 * {@link #TEXT_ALIGNMENT_INHERIT}, 16278 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16279 * {@link #TEXT_ALIGNMENT_CENTER}, 16280 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16281 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16282 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16283 * {@link #TEXT_ALIGNMENT_VIEW_END} 16284 */ 16285 @ViewDebug.ExportedProperty(category = "text", mapping = { 16286 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16287 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16288 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16289 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16290 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16291 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16292 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16293 }) 16294 public int getTextAlignment() { 16295 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16296 } 16297 16298 /** 16299 * Set the text alignment. 16300 * 16301 * @param textAlignment The text alignment to set. Should be one of 16302 * 16303 * {@link #TEXT_ALIGNMENT_INHERIT}, 16304 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16305 * {@link #TEXT_ALIGNMENT_CENTER}, 16306 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16307 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16308 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16309 * {@link #TEXT_ALIGNMENT_VIEW_END} 16310 * 16311 * @attr ref android.R.styleable#View_textAlignment 16312 */ 16313 public void setTextAlignment(int textAlignment) { 16314 if (textAlignment != getTextAlignment()) { 16315 // Reset the current and resolved text alignment 16316 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16317 resetResolvedTextAlignment(); 16318 // Set the new text alignment 16319 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16320 // Refresh 16321 requestLayout(); 16322 invalidate(true); 16323 } 16324 } 16325 16326 /** 16327 * Return the resolved text alignment. 16328 * 16329 * The resolved text alignment. This needs resolution if the value is 16330 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16331 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16332 * 16333 * @return the resolved text alignment. Returns one of: 16334 * 16335 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16336 * {@link #TEXT_ALIGNMENT_CENTER}, 16337 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16338 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16339 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16340 * {@link #TEXT_ALIGNMENT_VIEW_END} 16341 */ 16342 @ViewDebug.ExportedProperty(category = "text", mapping = { 16343 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16344 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16345 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16346 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16347 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16348 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16349 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16350 }) 16351 public int getResolvedTextAlignment() { 16352 // If text alignment is not resolved, then resolve it 16353 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16354 resolveTextAlignment(); 16355 } 16356 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16357 } 16358 16359 /** 16360 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16361 * resolution is done. 16362 */ 16363 public void resolveTextAlignment() { 16364 // Reset any previous text alignment resolution 16365 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16366 16367 if (hasRtlSupport()) { 16368 // Set resolved text alignment flag depending on text alignment flag 16369 final int textAlignment = getTextAlignment(); 16370 switch (textAlignment) { 16371 case TEXT_ALIGNMENT_INHERIT: 16372 // Check if we can resolve the text alignment 16373 if (canResolveLayoutDirection() && mParent instanceof View) { 16374 View view = (View) mParent; 16375 16376 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16377 switch (parentResolvedTextAlignment) { 16378 case TEXT_ALIGNMENT_GRAVITY: 16379 case TEXT_ALIGNMENT_TEXT_START: 16380 case TEXT_ALIGNMENT_TEXT_END: 16381 case TEXT_ALIGNMENT_CENTER: 16382 case TEXT_ALIGNMENT_VIEW_START: 16383 case TEXT_ALIGNMENT_VIEW_END: 16384 // Resolved text alignment is the same as the parent resolved 16385 // text alignment 16386 mPrivateFlags2 |= 16387 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16388 break; 16389 default: 16390 // Use default resolved text alignment 16391 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16392 } 16393 } 16394 else { 16395 // We cannot do the resolution if there is no parent so use the default 16396 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16397 } 16398 break; 16399 case TEXT_ALIGNMENT_GRAVITY: 16400 case TEXT_ALIGNMENT_TEXT_START: 16401 case TEXT_ALIGNMENT_TEXT_END: 16402 case TEXT_ALIGNMENT_CENTER: 16403 case TEXT_ALIGNMENT_VIEW_START: 16404 case TEXT_ALIGNMENT_VIEW_END: 16405 // Resolved text alignment is the same as text alignment 16406 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16407 break; 16408 default: 16409 // Use default resolved text alignment 16410 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16411 } 16412 } else { 16413 // Use default resolved text alignment 16414 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16415 } 16416 16417 // Set the resolved 16418 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16419 onResolvedTextAlignmentChanged(); 16420 } 16421 16422 /** 16423 * Check if text alignment resolution can be done. 16424 * 16425 * @return true if text alignment resolution can be done otherwise return false. 16426 */ 16427 public boolean canResolveTextAlignment() { 16428 switch (getTextAlignment()) { 16429 case TEXT_DIRECTION_INHERIT: 16430 return (mParent != null); 16431 default: 16432 return true; 16433 } 16434 } 16435 16436 /** 16437 * Called when text alignment has been resolved. Subclasses that care about text alignment 16438 * resolution should override this method. 16439 * 16440 * The default implementation does nothing. 16441 */ 16442 public void onResolvedTextAlignmentChanged() { 16443 } 16444 16445 /** 16446 * Reset resolved text alignment. Text alignment can be resolved with a call to 16447 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16448 * reset is done. 16449 */ 16450 public void resetResolvedTextAlignment() { 16451 // Reset any previous text alignment resolution 16452 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16453 onResolvedTextAlignmentReset(); 16454 } 16455 16456 /** 16457 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16458 * override this method and do a reset of the text alignment of their children. The default 16459 * implementation does nothing. 16460 */ 16461 public void onResolvedTextAlignmentReset() { 16462 } 16463 16464 // 16465 // Properties 16466 // 16467 /** 16468 * A Property wrapper around the <code>alpha</code> functionality handled by the 16469 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16470 */ 16471 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16472 @Override 16473 public void setValue(View object, float value) { 16474 object.setAlpha(value); 16475 } 16476 16477 @Override 16478 public Float get(View object) { 16479 return object.getAlpha(); 16480 } 16481 }; 16482 16483 /** 16484 * A Property wrapper around the <code>translationX</code> functionality handled by the 16485 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16486 */ 16487 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16488 @Override 16489 public void setValue(View object, float value) { 16490 object.setTranslationX(value); 16491 } 16492 16493 @Override 16494 public Float get(View object) { 16495 return object.getTranslationX(); 16496 } 16497 }; 16498 16499 /** 16500 * A Property wrapper around the <code>translationY</code> functionality handled by the 16501 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16502 */ 16503 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16504 @Override 16505 public void setValue(View object, float value) { 16506 object.setTranslationY(value); 16507 } 16508 16509 @Override 16510 public Float get(View object) { 16511 return object.getTranslationY(); 16512 } 16513 }; 16514 16515 /** 16516 * A Property wrapper around the <code>x</code> functionality handled by the 16517 * {@link View#setX(float)} and {@link View#getX()} methods. 16518 */ 16519 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16520 @Override 16521 public void setValue(View object, float value) { 16522 object.setX(value); 16523 } 16524 16525 @Override 16526 public Float get(View object) { 16527 return object.getX(); 16528 } 16529 }; 16530 16531 /** 16532 * A Property wrapper around the <code>y</code> functionality handled by the 16533 * {@link View#setY(float)} and {@link View#getY()} methods. 16534 */ 16535 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16536 @Override 16537 public void setValue(View object, float value) { 16538 object.setY(value); 16539 } 16540 16541 @Override 16542 public Float get(View object) { 16543 return object.getY(); 16544 } 16545 }; 16546 16547 /** 16548 * A Property wrapper around the <code>rotation</code> functionality handled by the 16549 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16550 */ 16551 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16552 @Override 16553 public void setValue(View object, float value) { 16554 object.setRotation(value); 16555 } 16556 16557 @Override 16558 public Float get(View object) { 16559 return object.getRotation(); 16560 } 16561 }; 16562 16563 /** 16564 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16565 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16566 */ 16567 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16568 @Override 16569 public void setValue(View object, float value) { 16570 object.setRotationX(value); 16571 } 16572 16573 @Override 16574 public Float get(View object) { 16575 return object.getRotationX(); 16576 } 16577 }; 16578 16579 /** 16580 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16581 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16582 */ 16583 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16584 @Override 16585 public void setValue(View object, float value) { 16586 object.setRotationY(value); 16587 } 16588 16589 @Override 16590 public Float get(View object) { 16591 return object.getRotationY(); 16592 } 16593 }; 16594 16595 /** 16596 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16597 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16598 */ 16599 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16600 @Override 16601 public void setValue(View object, float value) { 16602 object.setScaleX(value); 16603 } 16604 16605 @Override 16606 public Float get(View object) { 16607 return object.getScaleX(); 16608 } 16609 }; 16610 16611 /** 16612 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16613 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16614 */ 16615 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16616 @Override 16617 public void setValue(View object, float value) { 16618 object.setScaleY(value); 16619 } 16620 16621 @Override 16622 public Float get(View object) { 16623 return object.getScaleY(); 16624 } 16625 }; 16626 16627 /** 16628 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16629 * Each MeasureSpec represents a requirement for either the width or the height. 16630 * A MeasureSpec is comprised of a size and a mode. There are three possible 16631 * modes: 16632 * <dl> 16633 * <dt>UNSPECIFIED</dt> 16634 * <dd> 16635 * The parent has not imposed any constraint on the child. It can be whatever size 16636 * it wants. 16637 * </dd> 16638 * 16639 * <dt>EXACTLY</dt> 16640 * <dd> 16641 * The parent has determined an exact size for the child. The child is going to be 16642 * given those bounds regardless of how big it wants to be. 16643 * </dd> 16644 * 16645 * <dt>AT_MOST</dt> 16646 * <dd> 16647 * The child can be as large as it wants up to the specified size. 16648 * </dd> 16649 * </dl> 16650 * 16651 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16652 * is provided to pack and unpack the <size, mode> tuple into the int. 16653 */ 16654 public static class MeasureSpec { 16655 private static final int MODE_SHIFT = 30; 16656 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16657 16658 /** 16659 * Measure specification mode: The parent has not imposed any constraint 16660 * on the child. It can be whatever size it wants. 16661 */ 16662 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16663 16664 /** 16665 * Measure specification mode: The parent has determined an exact size 16666 * for the child. The child is going to be given those bounds regardless 16667 * of how big it wants to be. 16668 */ 16669 public static final int EXACTLY = 1 << MODE_SHIFT; 16670 16671 /** 16672 * Measure specification mode: The child can be as large as it wants up 16673 * to the specified size. 16674 */ 16675 public static final int AT_MOST = 2 << MODE_SHIFT; 16676 16677 /** 16678 * Creates a measure specification based on the supplied size and mode. 16679 * 16680 * The mode must always be one of the following: 16681 * <ul> 16682 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16683 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16684 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16685 * </ul> 16686 * 16687 * @param size the size of the measure specification 16688 * @param mode the mode of the measure specification 16689 * @return the measure specification based on size and mode 16690 */ 16691 public static int makeMeasureSpec(int size, int mode) { 16692 return size + mode; 16693 } 16694 16695 /** 16696 * Extracts the mode from the supplied measure specification. 16697 * 16698 * @param measureSpec the measure specification to extract the mode from 16699 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16700 * {@link android.view.View.MeasureSpec#AT_MOST} or 16701 * {@link android.view.View.MeasureSpec#EXACTLY} 16702 */ 16703 public static int getMode(int measureSpec) { 16704 return (measureSpec & MODE_MASK); 16705 } 16706 16707 /** 16708 * Extracts the size from the supplied measure specification. 16709 * 16710 * @param measureSpec the measure specification to extract the size from 16711 * @return the size in pixels defined in the supplied measure specification 16712 */ 16713 public static int getSize(int measureSpec) { 16714 return (measureSpec & ~MODE_MASK); 16715 } 16716 16717 /** 16718 * Returns a String representation of the specified measure 16719 * specification. 16720 * 16721 * @param measureSpec the measure specification to convert to a String 16722 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16723 */ 16724 public static String toString(int measureSpec) { 16725 int mode = getMode(measureSpec); 16726 int size = getSize(measureSpec); 16727 16728 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16729 16730 if (mode == UNSPECIFIED) 16731 sb.append("UNSPECIFIED "); 16732 else if (mode == EXACTLY) 16733 sb.append("EXACTLY "); 16734 else if (mode == AT_MOST) 16735 sb.append("AT_MOST "); 16736 else 16737 sb.append(mode).append(" "); 16738 16739 sb.append(size); 16740 return sb.toString(); 16741 } 16742 } 16743 16744 class CheckForLongPress implements Runnable { 16745 16746 private int mOriginalWindowAttachCount; 16747 16748 public void run() { 16749 if (isPressed() && (mParent != null) 16750 && mOriginalWindowAttachCount == mWindowAttachCount) { 16751 if (performLongClick()) { 16752 mHasPerformedLongPress = true; 16753 } 16754 } 16755 } 16756 16757 public void rememberWindowAttachCount() { 16758 mOriginalWindowAttachCount = mWindowAttachCount; 16759 } 16760 } 16761 16762 private final class CheckForTap implements Runnable { 16763 public void run() { 16764 mPrivateFlags &= ~PREPRESSED; 16765 setPressed(true); 16766 checkForLongClick(ViewConfiguration.getTapTimeout()); 16767 } 16768 } 16769 16770 private final class PerformClick implements Runnable { 16771 public void run() { 16772 performClick(); 16773 } 16774 } 16775 16776 /** @hide */ 16777 public void hackTurnOffWindowResizeAnim(boolean off) { 16778 mAttachInfo.mTurnOffWindowResizeAnim = off; 16779 } 16780 16781 /** 16782 * This method returns a ViewPropertyAnimator object, which can be used to animate 16783 * specific properties on this View. 16784 * 16785 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16786 */ 16787 public ViewPropertyAnimator animate() { 16788 if (mAnimator == null) { 16789 mAnimator = new ViewPropertyAnimator(this); 16790 } 16791 return mAnimator; 16792 } 16793 16794 /** 16795 * Interface definition for a callback to be invoked when a key event is 16796 * dispatched to this view. The callback will be invoked before the key 16797 * event is given to the view. 16798 */ 16799 public interface OnKeyListener { 16800 /** 16801 * Called when a key is dispatched to a view. This allows listeners to 16802 * get a chance to respond before the target view. 16803 * 16804 * @param v The view the key has been dispatched to. 16805 * @param keyCode The code for the physical key that was pressed 16806 * @param event The KeyEvent object containing full information about 16807 * the event. 16808 * @return True if the listener has consumed the event, false otherwise. 16809 */ 16810 boolean onKey(View v, int keyCode, KeyEvent event); 16811 } 16812 16813 /** 16814 * Interface definition for a callback to be invoked when a touch event is 16815 * dispatched to this view. The callback will be invoked before the touch 16816 * event is given to the view. 16817 */ 16818 public interface OnTouchListener { 16819 /** 16820 * Called when a touch event is dispatched to a view. This allows listeners to 16821 * get a chance to respond before the target view. 16822 * 16823 * @param v The view the touch event has been dispatched to. 16824 * @param event The MotionEvent object containing full information about 16825 * the event. 16826 * @return True if the listener has consumed the event, false otherwise. 16827 */ 16828 boolean onTouch(View v, MotionEvent event); 16829 } 16830 16831 /** 16832 * Interface definition for a callback to be invoked when a hover event is 16833 * dispatched to this view. The callback will be invoked before the hover 16834 * event is given to the view. 16835 */ 16836 public interface OnHoverListener { 16837 /** 16838 * Called when a hover event is dispatched to a view. This allows listeners to 16839 * get a chance to respond before the target view. 16840 * 16841 * @param v The view the hover event has been dispatched to. 16842 * @param event The MotionEvent object containing full information about 16843 * the event. 16844 * @return True if the listener has consumed the event, false otherwise. 16845 */ 16846 boolean onHover(View v, MotionEvent event); 16847 } 16848 16849 /** 16850 * Interface definition for a callback to be invoked when a generic motion event is 16851 * dispatched to this view. The callback will be invoked before the generic motion 16852 * event is given to the view. 16853 */ 16854 public interface OnGenericMotionListener { 16855 /** 16856 * Called when a generic motion event is dispatched to a view. This allows listeners to 16857 * get a chance to respond before the target view. 16858 * 16859 * @param v The view the generic motion event has been dispatched to. 16860 * @param event The MotionEvent object containing full information about 16861 * the event. 16862 * @return True if the listener has consumed the event, false otherwise. 16863 */ 16864 boolean onGenericMotion(View v, MotionEvent event); 16865 } 16866 16867 /** 16868 * Interface definition for a callback to be invoked when a view has been clicked and held. 16869 */ 16870 public interface OnLongClickListener { 16871 /** 16872 * Called when a view has been clicked and held. 16873 * 16874 * @param v The view that was clicked and held. 16875 * 16876 * @return true if the callback consumed the long click, false otherwise. 16877 */ 16878 boolean onLongClick(View v); 16879 } 16880 16881 /** 16882 * Interface definition for a callback to be invoked when a drag is being dispatched 16883 * to this view. The callback will be invoked before the hosting view's own 16884 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16885 * onDrag(event) behavior, it should return 'false' from this callback. 16886 * 16887 * <div class="special reference"> 16888 * <h3>Developer Guides</h3> 16889 * <p>For a guide to implementing drag and drop features, read the 16890 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16891 * </div> 16892 */ 16893 public interface OnDragListener { 16894 /** 16895 * Called when a drag event is dispatched to a view. This allows listeners 16896 * to get a chance to override base View behavior. 16897 * 16898 * @param v The View that received the drag event. 16899 * @param event The {@link android.view.DragEvent} object for the drag event. 16900 * @return {@code true} if the drag event was handled successfully, or {@code false} 16901 * if the drag event was not handled. Note that {@code false} will trigger the View 16902 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16903 */ 16904 boolean onDrag(View v, DragEvent event); 16905 } 16906 16907 /** 16908 * Interface definition for a callback to be invoked when the focus state of 16909 * a view changed. 16910 */ 16911 public interface OnFocusChangeListener { 16912 /** 16913 * Called when the focus state of a view has changed. 16914 * 16915 * @param v The view whose state has changed. 16916 * @param hasFocus The new focus state of v. 16917 */ 16918 void onFocusChange(View v, boolean hasFocus); 16919 } 16920 16921 /** 16922 * Interface definition for a callback to be invoked when a view is clicked. 16923 */ 16924 public interface OnClickListener { 16925 /** 16926 * Called when a view has been clicked. 16927 * 16928 * @param v The view that was clicked. 16929 */ 16930 void onClick(View v); 16931 } 16932 16933 /** 16934 * Interface definition for a callback to be invoked when the context menu 16935 * for this view is being built. 16936 */ 16937 public interface OnCreateContextMenuListener { 16938 /** 16939 * Called when the context menu for this view is being built. It is not 16940 * safe to hold onto the menu after this method returns. 16941 * 16942 * @param menu The context menu that is being built 16943 * @param v The view for which the context menu is being built 16944 * @param menuInfo Extra information about the item for which the 16945 * context menu should be shown. This information will vary 16946 * depending on the class of v. 16947 */ 16948 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16949 } 16950 16951 /** 16952 * Interface definition for a callback to be invoked when the status bar changes 16953 * visibility. This reports <strong>global</strong> changes to the system UI 16954 * state, not what the application is requesting. 16955 * 16956 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16957 */ 16958 public interface OnSystemUiVisibilityChangeListener { 16959 /** 16960 * Called when the status bar changes visibility because of a call to 16961 * {@link View#setSystemUiVisibility(int)}. 16962 * 16963 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16964 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16965 * This tells you the <strong>global</strong> state of these UI visibility 16966 * flags, not what your app is currently applying. 16967 */ 16968 public void onSystemUiVisibilityChange(int visibility); 16969 } 16970 16971 /** 16972 * Interface definition for a callback to be invoked when this view is attached 16973 * or detached from its window. 16974 */ 16975 public interface OnAttachStateChangeListener { 16976 /** 16977 * Called when the view is attached to a window. 16978 * @param v The view that was attached 16979 */ 16980 public void onViewAttachedToWindow(View v); 16981 /** 16982 * Called when the view is detached from a window. 16983 * @param v The view that was detached 16984 */ 16985 public void onViewDetachedFromWindow(View v); 16986 } 16987 16988 private final class UnsetPressedState implements Runnable { 16989 public void run() { 16990 setPressed(false); 16991 } 16992 } 16993 16994 /** 16995 * Base class for derived classes that want to save and restore their own 16996 * state in {@link android.view.View#onSaveInstanceState()}. 16997 */ 16998 public static class BaseSavedState extends AbsSavedState { 16999 /** 17000 * Constructor used when reading from a parcel. Reads the state of the superclass. 17001 * 17002 * @param source 17003 */ 17004 public BaseSavedState(Parcel source) { 17005 super(source); 17006 } 17007 17008 /** 17009 * Constructor called by derived classes when creating their SavedState objects 17010 * 17011 * @param superState The state of the superclass of this view 17012 */ 17013 public BaseSavedState(Parcelable superState) { 17014 super(superState); 17015 } 17016 17017 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17018 new Parcelable.Creator<BaseSavedState>() { 17019 public BaseSavedState createFromParcel(Parcel in) { 17020 return new BaseSavedState(in); 17021 } 17022 17023 public BaseSavedState[] newArray(int size) { 17024 return new BaseSavedState[size]; 17025 } 17026 }; 17027 } 17028 17029 /** 17030 * A set of information given to a view when it is attached to its parent 17031 * window. 17032 */ 17033 static class AttachInfo { 17034 interface Callbacks { 17035 void playSoundEffect(int effectId); 17036 boolean performHapticFeedback(int effectId, boolean always); 17037 } 17038 17039 /** 17040 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17041 * to a Handler. This class contains the target (View) to invalidate and 17042 * the coordinates of the dirty rectangle. 17043 * 17044 * For performance purposes, this class also implements a pool of up to 17045 * POOL_LIMIT objects that get reused. This reduces memory allocations 17046 * whenever possible. 17047 */ 17048 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17049 private static final int POOL_LIMIT = 10; 17050 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17051 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17052 public InvalidateInfo newInstance() { 17053 return new InvalidateInfo(); 17054 } 17055 17056 public void onAcquired(InvalidateInfo element) { 17057 } 17058 17059 public void onReleased(InvalidateInfo element) { 17060 element.target = null; 17061 } 17062 }, POOL_LIMIT) 17063 ); 17064 17065 private InvalidateInfo mNext; 17066 private boolean mIsPooled; 17067 17068 View target; 17069 17070 int left; 17071 int top; 17072 int right; 17073 int bottom; 17074 17075 public void setNextPoolable(InvalidateInfo element) { 17076 mNext = element; 17077 } 17078 17079 public InvalidateInfo getNextPoolable() { 17080 return mNext; 17081 } 17082 17083 static InvalidateInfo acquire() { 17084 return sPool.acquire(); 17085 } 17086 17087 void release() { 17088 sPool.release(this); 17089 } 17090 17091 public boolean isPooled() { 17092 return mIsPooled; 17093 } 17094 17095 public void setPooled(boolean isPooled) { 17096 mIsPooled = isPooled; 17097 } 17098 } 17099 17100 final IWindowSession mSession; 17101 17102 final IWindow mWindow; 17103 17104 final IBinder mWindowToken; 17105 17106 final Callbacks mRootCallbacks; 17107 17108 HardwareCanvas mHardwareCanvas; 17109 17110 /** 17111 * The top view of the hierarchy. 17112 */ 17113 View mRootView; 17114 17115 IBinder mPanelParentWindowToken; 17116 Surface mSurface; 17117 17118 boolean mHardwareAccelerated; 17119 boolean mHardwareAccelerationRequested; 17120 HardwareRenderer mHardwareRenderer; 17121 17122 boolean mScreenOn; 17123 17124 /** 17125 * Scale factor used by the compatibility mode 17126 */ 17127 float mApplicationScale; 17128 17129 /** 17130 * Indicates whether the application is in compatibility mode 17131 */ 17132 boolean mScalingRequired; 17133 17134 /** 17135 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17136 */ 17137 boolean mTurnOffWindowResizeAnim; 17138 17139 /** 17140 * Left position of this view's window 17141 */ 17142 int mWindowLeft; 17143 17144 /** 17145 * Top position of this view's window 17146 */ 17147 int mWindowTop; 17148 17149 /** 17150 * Indicates whether views need to use 32-bit drawing caches 17151 */ 17152 boolean mUse32BitDrawingCache; 17153 17154 /** 17155 * For windows that are full-screen but using insets to layout inside 17156 * of the screen decorations, these are the current insets for the 17157 * content of the window. 17158 */ 17159 final Rect mContentInsets = new Rect(); 17160 17161 /** 17162 * For windows that are full-screen but using insets to layout inside 17163 * of the screen decorations, these are the current insets for the 17164 * actual visible parts of the window. 17165 */ 17166 final Rect mVisibleInsets = new Rect(); 17167 17168 /** 17169 * The internal insets given by this window. This value is 17170 * supplied by the client (through 17171 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17172 * be given to the window manager when changed to be used in laying 17173 * out windows behind it. 17174 */ 17175 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17176 = new ViewTreeObserver.InternalInsetsInfo(); 17177 17178 /** 17179 * All views in the window's hierarchy that serve as scroll containers, 17180 * used to determine if the window can be resized or must be panned 17181 * to adjust for a soft input area. 17182 */ 17183 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17184 17185 final KeyEvent.DispatcherState mKeyDispatchState 17186 = new KeyEvent.DispatcherState(); 17187 17188 /** 17189 * Indicates whether the view's window currently has the focus. 17190 */ 17191 boolean mHasWindowFocus; 17192 17193 /** 17194 * The current visibility of the window. 17195 */ 17196 int mWindowVisibility; 17197 17198 /** 17199 * Indicates the time at which drawing started to occur. 17200 */ 17201 long mDrawingTime; 17202 17203 /** 17204 * Indicates whether or not ignoring the DIRTY_MASK flags. 17205 */ 17206 boolean mIgnoreDirtyState; 17207 17208 /** 17209 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17210 * to avoid clearing that flag prematurely. 17211 */ 17212 boolean mSetIgnoreDirtyState = false; 17213 17214 /** 17215 * Indicates whether the view's window is currently in touch mode. 17216 */ 17217 boolean mInTouchMode; 17218 17219 /** 17220 * Indicates that ViewAncestor should trigger a global layout change 17221 * the next time it performs a traversal 17222 */ 17223 boolean mRecomputeGlobalAttributes; 17224 17225 /** 17226 * Always report new attributes at next traversal. 17227 */ 17228 boolean mForceReportNewAttributes; 17229 17230 /** 17231 * Set during a traveral if any views want to keep the screen on. 17232 */ 17233 boolean mKeepScreenOn; 17234 17235 /** 17236 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17237 */ 17238 int mSystemUiVisibility; 17239 17240 /** 17241 * Hack to force certain system UI visibility flags to be cleared. 17242 */ 17243 int mDisabledSystemUiVisibility; 17244 17245 /** 17246 * Last global system UI visibility reported by the window manager. 17247 */ 17248 int mGlobalSystemUiVisibility; 17249 17250 /** 17251 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17252 * attached. 17253 */ 17254 boolean mHasSystemUiListeners; 17255 17256 /** 17257 * Set if the visibility of any views has changed. 17258 */ 17259 boolean mViewVisibilityChanged; 17260 17261 /** 17262 * Set to true if a view has been scrolled. 17263 */ 17264 boolean mViewScrollChanged; 17265 17266 /** 17267 * Global to the view hierarchy used as a temporary for dealing with 17268 * x/y points in the transparent region computations. 17269 */ 17270 final int[] mTransparentLocation = new int[2]; 17271 17272 /** 17273 * Global to the view hierarchy used as a temporary for dealing with 17274 * x/y points in the ViewGroup.invalidateChild implementation. 17275 */ 17276 final int[] mInvalidateChildLocation = new int[2]; 17277 17278 17279 /** 17280 * Global to the view hierarchy used as a temporary for dealing with 17281 * x/y location when view is transformed. 17282 */ 17283 final float[] mTmpTransformLocation = new float[2]; 17284 17285 /** 17286 * The view tree observer used to dispatch global events like 17287 * layout, pre-draw, touch mode change, etc. 17288 */ 17289 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17290 17291 /** 17292 * A Canvas used by the view hierarchy to perform bitmap caching. 17293 */ 17294 Canvas mCanvas; 17295 17296 /** 17297 * The view root impl. 17298 */ 17299 final ViewRootImpl mViewRootImpl; 17300 17301 /** 17302 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17303 * handler can be used to pump events in the UI events queue. 17304 */ 17305 final Handler mHandler; 17306 17307 /** 17308 * Temporary for use in computing invalidate rectangles while 17309 * calling up the hierarchy. 17310 */ 17311 final Rect mTmpInvalRect = new Rect(); 17312 17313 /** 17314 * Temporary for use in computing hit areas with transformed views 17315 */ 17316 final RectF mTmpTransformRect = new RectF(); 17317 17318 /** 17319 * Temporary list for use in collecting focusable descendents of a view. 17320 */ 17321 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17322 17323 /** 17324 * The id of the window for accessibility purposes. 17325 */ 17326 int mAccessibilityWindowId = View.NO_ID; 17327 17328 /** 17329 * Whether to ingore not exposed for accessibility Views when 17330 * reporting the view tree to accessibility services. 17331 */ 17332 boolean mIncludeNotImportantViews; 17333 17334 /** 17335 * The drawable for highlighting accessibility focus. 17336 */ 17337 Drawable mAccessibilityFocusDrawable; 17338 17339 /** 17340 * Show where the margins, bounds and layout bounds are for each view. 17341 */ 17342 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17343 17344 /** 17345 * Point used to compute visible regions. 17346 */ 17347 final Point mPoint = new Point(); 17348 17349 /** 17350 * Creates a new set of attachment information with the specified 17351 * events handler and thread. 17352 * 17353 * @param handler the events handler the view must use 17354 */ 17355 AttachInfo(IWindowSession session, IWindow window, 17356 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17357 mSession = session; 17358 mWindow = window; 17359 mWindowToken = window.asBinder(); 17360 mViewRootImpl = viewRootImpl; 17361 mHandler = handler; 17362 mRootCallbacks = effectPlayer; 17363 } 17364 } 17365 17366 /** 17367 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17368 * is supported. This avoids keeping too many unused fields in most 17369 * instances of View.</p> 17370 */ 17371 private static class ScrollabilityCache implements Runnable { 17372 17373 /** 17374 * Scrollbars are not visible 17375 */ 17376 public static final int OFF = 0; 17377 17378 /** 17379 * Scrollbars are visible 17380 */ 17381 public static final int ON = 1; 17382 17383 /** 17384 * Scrollbars are fading away 17385 */ 17386 public static final int FADING = 2; 17387 17388 public boolean fadeScrollBars; 17389 17390 public int fadingEdgeLength; 17391 public int scrollBarDefaultDelayBeforeFade; 17392 public int scrollBarFadeDuration; 17393 17394 public int scrollBarSize; 17395 public ScrollBarDrawable scrollBar; 17396 public float[] interpolatorValues; 17397 public View host; 17398 17399 public final Paint paint; 17400 public final Matrix matrix; 17401 public Shader shader; 17402 17403 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17404 17405 private static final float[] OPAQUE = { 255 }; 17406 private static final float[] TRANSPARENT = { 0.0f }; 17407 17408 /** 17409 * When fading should start. This time moves into the future every time 17410 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17411 */ 17412 public long fadeStartTime; 17413 17414 17415 /** 17416 * The current state of the scrollbars: ON, OFF, or FADING 17417 */ 17418 public int state = OFF; 17419 17420 private int mLastColor; 17421 17422 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17423 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17424 scrollBarSize = configuration.getScaledScrollBarSize(); 17425 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17426 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17427 17428 paint = new Paint(); 17429 matrix = new Matrix(); 17430 // use use a height of 1, and then wack the matrix each time we 17431 // actually use it. 17432 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17433 17434 paint.setShader(shader); 17435 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17436 this.host = host; 17437 } 17438 17439 public void setFadeColor(int color) { 17440 if (color != 0 && color != mLastColor) { 17441 mLastColor = color; 17442 color |= 0xFF000000; 17443 17444 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17445 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17446 17447 paint.setShader(shader); 17448 // Restore the default transfer mode (src_over) 17449 paint.setXfermode(null); 17450 } 17451 } 17452 17453 public void run() { 17454 long now = AnimationUtils.currentAnimationTimeMillis(); 17455 if (now >= fadeStartTime) { 17456 17457 // the animation fades the scrollbars out by changing 17458 // the opacity (alpha) from fully opaque to fully 17459 // transparent 17460 int nextFrame = (int) now; 17461 int framesCount = 0; 17462 17463 Interpolator interpolator = scrollBarInterpolator; 17464 17465 // Start opaque 17466 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17467 17468 // End transparent 17469 nextFrame += scrollBarFadeDuration; 17470 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17471 17472 state = FADING; 17473 17474 // Kick off the fade animation 17475 host.invalidate(true); 17476 } 17477 } 17478 } 17479 17480 /** 17481 * Resuable callback for sending 17482 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17483 */ 17484 private class SendViewScrolledAccessibilityEvent implements Runnable { 17485 public volatile boolean mIsPending; 17486 17487 public void run() { 17488 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17489 mIsPending = false; 17490 } 17491 } 17492 17493 /** 17494 * <p> 17495 * This class represents a delegate that can be registered in a {@link View} 17496 * to enhance accessibility support via composition rather via inheritance. 17497 * It is specifically targeted to widget developers that extend basic View 17498 * classes i.e. classes in package android.view, that would like their 17499 * applications to be backwards compatible. 17500 * </p> 17501 * <div class="special reference"> 17502 * <h3>Developer Guides</h3> 17503 * <p>For more information about making applications accessible, read the 17504 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17505 * developer guide.</p> 17506 * </div> 17507 * <p> 17508 * A scenario in which a developer would like to use an accessibility delegate 17509 * is overriding a method introduced in a later API version then the minimal API 17510 * version supported by the application. For example, the method 17511 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17512 * in API version 4 when the accessibility APIs were first introduced. If a 17513 * developer would like his application to run on API version 4 devices (assuming 17514 * all other APIs used by the application are version 4 or lower) and take advantage 17515 * of this method, instead of overriding the method which would break the application's 17516 * backwards compatibility, he can override the corresponding method in this 17517 * delegate and register the delegate in the target View if the API version of 17518 * the system is high enough i.e. the API version is same or higher to the API 17519 * version that introduced 17520 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17521 * </p> 17522 * <p> 17523 * Here is an example implementation: 17524 * </p> 17525 * <code><pre><p> 17526 * if (Build.VERSION.SDK_INT >= 14) { 17527 * // If the API version is equal of higher than the version in 17528 * // which onInitializeAccessibilityNodeInfo was introduced we 17529 * // register a delegate with a customized implementation. 17530 * View view = findViewById(R.id.view_id); 17531 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17532 * public void onInitializeAccessibilityNodeInfo(View host, 17533 * AccessibilityNodeInfo info) { 17534 * // Let the default implementation populate the info. 17535 * super.onInitializeAccessibilityNodeInfo(host, info); 17536 * // Set some other information. 17537 * info.setEnabled(host.isEnabled()); 17538 * } 17539 * }); 17540 * } 17541 * </code></pre></p> 17542 * <p> 17543 * This delegate contains methods that correspond to the accessibility methods 17544 * in View. If a delegate has been specified the implementation in View hands 17545 * off handling to the corresponding method in this delegate. The default 17546 * implementation the delegate methods behaves exactly as the corresponding 17547 * method in View for the case of no accessibility delegate been set. Hence, 17548 * to customize the behavior of a View method, clients can override only the 17549 * corresponding delegate method without altering the behavior of the rest 17550 * accessibility related methods of the host view. 17551 * </p> 17552 */ 17553 public static class AccessibilityDelegate { 17554 17555 /** 17556 * Sends an accessibility event of the given type. If accessibility is not 17557 * enabled this method has no effect. 17558 * <p> 17559 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17560 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17561 * been set. 17562 * </p> 17563 * 17564 * @param host The View hosting the delegate. 17565 * @param eventType The type of the event to send. 17566 * 17567 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17568 */ 17569 public void sendAccessibilityEvent(View host, int eventType) { 17570 host.sendAccessibilityEventInternal(eventType); 17571 } 17572 17573 /** 17574 * Performs the specified accessibility action on the view. For 17575 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17576 * <p> 17577 * The default implementation behaves as 17578 * {@link View#performAccessibilityAction(int, Bundle) 17579 * View#performAccessibilityAction(int, Bundle)} for the case of 17580 * no accessibility delegate been set. 17581 * </p> 17582 * 17583 * @param action The action to perform. 17584 * @return Whether the action was performed. 17585 * 17586 * @see View#performAccessibilityAction(int, Bundle) 17587 * View#performAccessibilityAction(int, Bundle) 17588 */ 17589 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17590 return host.performAccessibilityActionInternal(action, args); 17591 } 17592 17593 /** 17594 * Sends an accessibility event. This method behaves exactly as 17595 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17596 * empty {@link AccessibilityEvent} and does not perform a check whether 17597 * accessibility is enabled. 17598 * <p> 17599 * The default implementation behaves as 17600 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17601 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17602 * the case of no accessibility delegate been set. 17603 * </p> 17604 * 17605 * @param host The View hosting the delegate. 17606 * @param event The event to send. 17607 * 17608 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17609 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17610 */ 17611 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17612 host.sendAccessibilityEventUncheckedInternal(event); 17613 } 17614 17615 /** 17616 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17617 * to its children for adding their text content to the event. 17618 * <p> 17619 * The default implementation behaves as 17620 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17621 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17622 * the case of no accessibility delegate been set. 17623 * </p> 17624 * 17625 * @param host The View hosting the delegate. 17626 * @param event The event. 17627 * @return True if the event population was completed. 17628 * 17629 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17630 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17631 */ 17632 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17633 return host.dispatchPopulateAccessibilityEventInternal(event); 17634 } 17635 17636 /** 17637 * Gives a chance to the host View to populate the accessibility event with its 17638 * text content. 17639 * <p> 17640 * The default implementation behaves as 17641 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17642 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17643 * the case of no accessibility delegate been set. 17644 * </p> 17645 * 17646 * @param host The View hosting the delegate. 17647 * @param event The accessibility event which to populate. 17648 * 17649 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17650 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17651 */ 17652 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17653 host.onPopulateAccessibilityEventInternal(event); 17654 } 17655 17656 /** 17657 * Initializes an {@link AccessibilityEvent} with information about the 17658 * the host View which is the event source. 17659 * <p> 17660 * The default implementation behaves as 17661 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17662 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17663 * the case of no accessibility delegate been set. 17664 * </p> 17665 * 17666 * @param host The View hosting the delegate. 17667 * @param event The event to initialize. 17668 * 17669 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17670 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17671 */ 17672 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17673 host.onInitializeAccessibilityEventInternal(event); 17674 } 17675 17676 /** 17677 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17678 * <p> 17679 * The default implementation behaves as 17680 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17681 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17682 * the case of no accessibility delegate been set. 17683 * </p> 17684 * 17685 * @param host The View hosting the delegate. 17686 * @param info The instance to initialize. 17687 * 17688 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17689 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17690 */ 17691 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17692 host.onInitializeAccessibilityNodeInfoInternal(info); 17693 } 17694 17695 /** 17696 * Called when a child of the host View has requested sending an 17697 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17698 * to augment the event. 17699 * <p> 17700 * The default implementation behaves as 17701 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17702 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17703 * the case of no accessibility delegate been set. 17704 * </p> 17705 * 17706 * @param host The View hosting the delegate. 17707 * @param child The child which requests sending the event. 17708 * @param event The event to be sent. 17709 * @return True if the event should be sent 17710 * 17711 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17712 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17713 */ 17714 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17715 AccessibilityEvent event) { 17716 return host.onRequestSendAccessibilityEventInternal(child, event); 17717 } 17718 17719 /** 17720 * Gets the provider for managing a virtual view hierarchy rooted at this View 17721 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17722 * that explore the window content. 17723 * <p> 17724 * The default implementation behaves as 17725 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17726 * the case of no accessibility delegate been set. 17727 * </p> 17728 * 17729 * @return The provider. 17730 * 17731 * @see AccessibilityNodeProvider 17732 */ 17733 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17734 return null; 17735 } 17736 } 17737} 17738